Recycling method for polymer compositions

Abstract

Herein a specific recycling method for polymer compositions is described.

Description

Recycling method for polymer compositionsSpecific parts of a car, especially in the car interior, the chassis and the drive, are made of a specific polymer composition. In addition to the polymer, these polymer compositions usually also contain glass fibers and several additives. The mixture of several components in a composition makes it difficult to recycle the entire composition, especially if the received recycled material is again used in new polymer compositions in a car, i.e. closed loop recycling. The inventors recognized that it is only possible to achieve a recycling content in the recycled polymer composition which is higher than the content of the polymer, if the glass fibers and / or the additives are recycled in a specific method as well. For this reason, the object of the present invention is to provide a method which exhibits one or more of the following: is suitable for closed loop recycling, preserves the glass fibers, improved yield and turnover, produces less waste, and / or leads to product in which the recycling content is higher than the content of the polymer.In addition, it is an object of the present invention to provide a polymer composition and / or product which exhibit(s) one or more of the following: enhanced recycling content, improved mechanical properties, improved purity, enhanced closed loop recycling content, reduced PCF, and / or recycling content higher than the content of the polymer.This object is at least partially solved by a method comprising the steps: v’) providing a compound C3 comprising a residue R, wherein the compound C3 is obtained by or obtainable by a method comprising the steps: i) providing a waste stream WO comprising a polymer PO, preferably and glass fibers GFO, wherein the polymer PO is obtainable by polymerizing a mixture comprising a monomer A, preferably and a monomer B, ii) preferably sorting the waste stream WO to obtain a waste stream W1 ,Hi) bringing the waste stream WO, preferably the waste stream W1, in contact with a composition CO to obtain a mixture M1 , iv) heating the mixture M1 to obtain a mixture M2, v) separating the mixture M2 to obtain the compound C3 comprising the residue R,C3-vi) purifying and / or converting the compound C3 to obtain a compound C3’ comprising a monomer X and / or one or more additive(s) AD1 , and vii) preferably mixing and / or polymerizing a mixture M3, comprising the compound C3’, preferably and a polymer P1 and / or one or more additive(s) AD1 , to obtain a polymer composition PC1 comprising a / the polymer P1, and viii) preferably converting the polymer composition PC1 to obtain a product PRF1.This object is also at least partially solved by a method comprising the steps, preferably in this order: v’) providing one or more of the following compound(s): a compound 01 comprising, preferably consisting of, glass fibers GF1, and / or a compound C2 comprising, preferably consisting of, a monomer A, preferably and monomer B; and / or oligomers thereof, and / or a compound C3 comprising, preferably consisting of, a residue R, wherein the compound C1 and / or compound C2 and / or compound C3 is / are obtained by or obtainable by a method comprising the steps, preferably in this order: i) providing a waste stream WO comprising a polymer PO, preferably and glass fibers GFO, wherein the polymer PO is obtainable by polymerizing a mixture comprising the monomer A, preferably and monomer B; and / or oligomers thereof, ii) preferably sorting the waste stream WO to obtain a waste stream W1 ,Hi) bringing the waste stream WO, preferably the waste stream W1, in contact with a composition CO to obtain a mixture M1 , iv) heating the mixture M1 to obtain a mixture M2, and v) separating the mixture M2 to obtain one or more of the following compound(s): the compound 01 comprising the glass fibers GF1, and / or the compound C2 comprising the monomer A, preferably and monomer B; and / or oligomers thereof, and / or the compound C3 comprising the residue R, vi) purifying and / or converting one or more of the compound C1, compound C2 and compound C3 to obtain one or more of the following compound(s): a compound CT comprising, preferably consisting of, glass fibers GFT, a compound C2’ comprising, preferably consisting of, the monomer A, preferably and monomer B; and / or oligomers thereof, and / or a compound C3’ comprising, preferably consisting of, a monomer X and / or one or more additive(s) AD 1, preferably wherein the step vi) comprises, preferably is, the step:C1-vi) purifying and / or converting the compound 01 to obtain a compound C1 ’ comprising, preferably consisting of, glass fibers GFT, and / or, preferably and, preferably wherein the step vi) comprises, preferably is, the step:02-vi) purifying and / or converting the compound 02 to obtain a compound 02’ comprising, preferably consisting of, the monomer A, preferably and monomer B; and / or oligomers thereof, and / or, preferably and, preferably wherein the step vi) comprises, preferably is, the step:03-vi) purifying and / or converting the compound 03 to obtain a compound 03’ comprising, preferably consisting of, a monomer X and / or one or more additive(s) AD1 , and vii) preferably mixing and / or polymerizing a mixture M3, comprising, preferably consisting of, compound 01 , 01’, 01”, 02, 02’, 03 or 03’; or a mixture thereof, to obtain a polymer P1 and / or a polymer composition PC1 comprising a / the polymer P1 , and viii) preferably converting the polymer P1 and / or the polymer composition PC1 to obtain a product PRF1.The object is further at least partially solved by a method, comprising the steps, preferably in this order:i) providing a waste stream WO comprising a polymer PO, preferably and glass fibers GFO, wherein the polymer PO is obtainable by polymerizing a mixture comprising a monomer A, preferably and monomer B; and / or oligomers thereof, ii) preferably sorting the waste stream WO to obtain a waste stream W1 ,Hi) bringing the waste stream WO, preferably the waste stream W1, in contact with a composition CO to obtain a mixture M1, iv) heating the mixture M1 to obtain a mixture M2, and v) separating the mixture M2 to obtain one or more of the following compound(s): a compound 01 comprising glass fibers GF1, and / or a compound C2 comprising the monomer A, preferably and monomer B; and / or oligomers thereof, and / or a compound C3 comprising a residue R, vi) purifying and / or converting one or more of the compound C1, compound C2 and compound C3 to obtain one or more of the following compound(s): a compound C1’ comprising, preferably consisting of, glass fibers GF1’, a compound C2’ comprising, preferably consisting of, the monomer A, preferably and monomer B; and / or oligomers thereof, and / or a compound C3’ comprising, preferably consisting of, a monomer X and / or one or more additive(s) AD 1, preferably wherein the step vi) comprises, preferably is, the step:C1-vi) purifying and / or converting the compound 01 to obtain a compound C1 ’ comprising, preferably consisting of, glass fibers GF1’, and / or, preferably and, preferably wherein the step vi) comprises, preferably is, the step:02-vi) purifying and / or converting the compound 02 to obtain a compound 02’ comprising, preferably consisting of, the monomer A, preferably and monomer B; and / or oligomers thereof, and / or, preferably and, preferably wherein the step vi) comprises, preferably is, the step:C3-vi) purifying and / or converting the compound 03 to obtain a compound 03’ comprising, preferably consisting of, a monomer X and / or one or more additive(s) AD1 , and vii) preferably mixing and / or polymerizing a mixture M3, comprising, preferably consisting of, compound 01 , 01’, 01”, 02, 02’, 03 or 03’; or a mixture thereof, to obtain a polymer P1 and / or a polymer composition PC1 comprising a / the polymer P1 , and viii) preferably converting the polymer P1 and / or the polymer composition PC1 to obtain a product PRF1.In case, the mixture M3 comprises compound 01, 01’, 01”, 03’; wherein compound 03’ comprises, preferably consists of, one or more additive(s) AD 1; or a mixture thereof, then the step vii) is preferably mixing the mixture M3, preferably further comprising polymer P1 , to obtain a polymer composition PC1 comprising a / the polymer P1.In case, the mixture M3 comprises compound 02, 02’, 03’; wherein compound 03’ comprises, preferably consists of, a monomer X; or a mixture thereof, then preferably the monomers are polymerized first to obtain polymer P1, preferably and then mixed with further compounds, preferably compounds 01, 01’, 01” or one or more additive(s) AD1; or a mixture thereof, to obtain a polymer composition PC1.“Mechanical recycling” refers to a recycling process in which a polymer or polymer composition is physically processed without substantial chemical modification. Such processes typically include grinding, melting, and re-extrusion to produce new articles from the recovered material.“Thermochemical recycling” refers to a recycling process in which a polymer or polymer composition is converted into smaller molecules or synthesis gas by means of thermal treatment in the presence or absence of reactive gases. Thermochemical recycling preferably comprises gasifying, steam cracking, and / or pyrolyzing, more preferably gasifying and / or pyrolyzing, a waste material.“Chemical recycling” refers to a recycling process in which a polymer is converted into its original monomers or other chemical building blocks by means of chemical reactions. Such reactions include, but are not limited to, depolymerization, pyrolysis, gasification, or comparable processes. Chemical recycling explicitly encompasses depolymerization of polymers, including enzymatic depolymerization.“Solvent-based recycling” refers to a recycling process in which a polymer or a polymer composition is at least partially dissolved by means of a solvent in order to recover components such as monomers, oligomers, or additives. Solventbased recycling also includes depolymerization of polymers, in particular enzymatic depolymerization.“Depolymerization” refers to a chemical reaction in which a polymer is cleaved into its monomers or oligomers under suitable conditions, such as temperature, pressure, and / or the presence of chemical reagents. Depolymerization also includes enzymatic depolymerization, wherein enzymes act as catalysts to promote the cleavage of polymer chains.“Enzymatic depolymerization” refers to a specific form of depolymerization in which enzymes are employed as catalysts to break down polymers into monomers or oligomers. Enzymatic depolymerization is considered to be both chemical recycling and solvent-based recycling within the meaning of this description.It is understood that the above recycling processes— mechanical recycling, thermochemical recycling, chemical recycling, and solvent-based recycling— may be combined in any technically reasonable manner.In a preferred embodiment, the step v) comprises, preferably is, the step: v) separating the mixture M2 to obtain a / the compound C1 comprising (the) glass fibers GF1.In a preferred embodiment, the step v) comprises, preferably is, the step: v) separating the mixture M2 to obtain a / the compound C2 comprising a / the monomer A, preferably and monomer B; and / or oligomers thereof.In a preferred embodiment, the step v) comprises, preferably is, the step: v) separating the mixture M2 to obtain a / the compound C3 comprising a / the residue R.In a preferred embodiment, in the step v, (at least) compound C1 is obtained; and / or wherein, in the step v’, (at least) compound C1 is provided.In a preferred embodiment, in the step v, (at least) compound C2 is obtained; and / or wherein, in the step v’, (at least) compound C2 is provided.In a preferred embodiment, in the step v, (at least) compound C3 is obtained; and / or wherein, in the step v’, (at least) compound C3 is provided.In a preferred embodiment, the step v) comprises, preferably is, the step: v) separating the mixture M2 to obtain: a / the compound 01 comprising (the) glass fibers GF1 , and a / the compound C2 comprising a / the monomer A, preferably and monomer B; and / or oligomers thereof, and preferably a / the compound C3 comprising a / the residue R; and / or the step v’) comprises, preferably is, the step: v’) providing: a / the compound 01 comprising (the) glass fibers GF1 , and a / the compound 02 comprising a / the monomer A, preferably and monomer B; and / or oligomers thereof, and preferably a / the compound 03 comprising a / the residue R.In a preferred embodiment, the step v) comprises, preferably is, the step: v) separating the mixture M2 to obtain: a / the compound 01 comprising (the) glass fibers GF1 , and a / the compound 03 comprising a / the residue R, and preferably a / the compound 02 comprising a / the monomer A, preferably and monomer B; and / or oligomers thereof; and / or the step v’) comprises, preferably is, the step: v’) providing: a / the compound 01 comprising (the) glass fibers GF1 , and a / the compound 03 comprising a / the residue R, and preferably a / the compound 02 comprising a / the monomer A, preferably and monomer B; and / or oligomers thereof.In a preferred embodiment, the step v) comprises, preferably is, the step: v) separating a / the mixture M2 to obtain: a / the compound 02 comprising a / the monomer A, preferably and monomer B; and / or oligomers thereof, and a / the compound 03 comprising a / the residue R, and preferably a / the compound 01 comprising (the) glass fibers GF1; and / or the step v’) comprises, preferably is, the step: v’) providing:a / the compound C2 comprising a / the monomer A, preferably and monomer B; and / or oligomers thereof, and a / the compound C3 comprising a / the residue R, and preferably a / the compound 01 comprising (the) glass fibers GF1 .In a preferred embodiment, the step v) comprises, preferably is, the step: v) separating the mixture M2 to obtain: a / the compound 01 comprising (the) glass fibers GF1 , and preferably a / the compound 02 comprising a / the monomer A, preferably and monomer B; and / or oligomers thereof, and / or preferably a / the compound 03 comprising a / the residue R; and / or the step v’) comprises, preferably is, the step: v’) providing: a / the compound 01 comprising (the) glass fibers GF1 , and preferably a / the compound 02 comprising a / the monomer A, preferably and monomer B; and / or oligomers thereof, and / or preferably a / the compound 03 comprising a / the residue R.In a preferred embodiment, in the heating step iv), the mixture M1 is stirred with a stirrer with a torque of 0.1 Nm or more, preferably 0.5 Nm or more, more preferably 1.0 Nm or more, more preferably 2.0 Nm or more, more preferably 3.0 Nm or more, more preferably 4.0 Nm or more, more preferably 5.0 Nm or more, more preferably 6.0 Nm or more, more preferably 7.0 Nm or more, more preferably 8.0 Nm or more, more preferably 9.0 Nm or more, more preferably 10.0 Nm or more, more preferably 15.0 Nm or more, more preferably 20.0 Nm or more, more preferably 50.0 Nm or more; and / or, in the heating step iv), the mixture M1 is stirred with a stirrer with a torque of 1000 Nm or less, preferably 750 Nm or less, more preferably 500 Nm or less, more preferably 250 Nm or less, more preferably 150 Nm or less, more preferably 100 Nm or less, more preferably 50 Nm or less, more preferably 25 Nm or less, more preferably 20 Nm or less, more preferably 15 Nm or less, more preferably 12 Nm or less, more preferably 10.0 Nm or less, more preferably 9.0 Nm or less, more preferably 8.0 Nm or less, more preferably 7.0 Nm or less, more preferably 6.0 Nm or less, more preferably 5.0 Nm or less, more preferably 4.0 Nm or less, more preferably 3.0 Nm or less, more preferably 2.0 Nm or less, more preferably 1.0 Nm or less. The inventors recognized, that if the mixture M1 is stirred with a high torque, the turnover is increased. In addition, the inventors recognized that if the torque is low, the glass fibers are preserved and the separation of the glass fibers is easier and more effective. As a consequence, the separation and yield of the glass fibers is improved and the yield and purity are improved. In addition, the polymer composition or product comprising the obtained recycled glass fibers exhibits improved mechanical properties.In a preferred embodiment, in the heating step iv), the mixture M1 is stirred with a stirrer with revolutions per minute of 10 rpm or more, preferably 30 rpm or more, more preferably 60 rpm or more, more preferably 120 rpm or more, more preferably 200 rpm or more, more preferably 300 rpm or more, more preferably 400 rpm or more, more preferably 500 rpm or more, more preferably 600 rpm or more; and / or, in the heating step iv), the mixture M1 is stirred with a stirrer with revolutions per minute of 1000 rpm or less, preferably 900 rpm or less, more preferably 800 rpm or less, more preferably 700 rpm or less, more preferably 600 rpm or less, more preferably 500 rpm or less, more preferably 400rpm or less, more preferably 300 rpm or less, more preferably 200 rpm or less, more preferably 100 rpm or less, more preferably 80 rpm or less, more preferably 60 rpm or less, more preferably 40 rpm or less, more preferably 20 rpm or less. The inventors recognized, that if the mixture M1 is stirred with a high number of revolutions, the turnover is increased. In addition, the inventors recognized that if the number of revolutions is low, the glass fibers are preserved, and the separation of the glass fibers is easier and more effective. As a consequence, the separation and yield of the glass fibers is improved and the yield and purity are improved. In addition, the polymer composition or product comprising the obtained recycled glass fibers exhibits improved mechanical properties.In a preferred embodiment, in the heating step iv), the mixture M1 is stirred with a stirrer with a power of 1 W or more, preferably 10 W or more, more preferably 25 W or more, more preferably 50 W or more, more preferably 100 W or more, more preferably 250 W or more, more preferably 500 W or more, more preferably 750 W or more, more preferably 1000 W or more, more preferably 2000 W or more, more preferably 4000 W or more, more preferably 6000 W or more; and / or, in the heating step iv), the mixture M1 is stirred with a stirrer with a power of 10000 W or less, preferably 7500 W or less, more preferably 5000 W or less, more preferably 2500 W or less, more preferably 1000 W or less, more preferably 800 W or less, more preferably 600 W or less, more preferably 400 W or less, more preferably 200 W or less, more preferably 100 W or less, more preferably 50 W or less, more preferably 25 W or less. The inventors recognized, that if the mixture M1 is stirred with high power, the turnover is increased. In addition, the inventors recognized that if the power is low, the glass fibers are preserved and the separation of the glass fibers is easier and more effective. As a consequence, the separation and yield of the glass fibers is improved and the yield and purity are improved. In addition, the polymer composition or product comprising the obtained recycled glass fibers exhibits improved mechanical properties.In a preferred embodiment, in the heating step iv), the mixture M1 is heated to a temperature TO of 150 °C or more, preferably 160 °C or more, more preferably 170 °C or more, more preferably 180 °C or more, more preferably 190 °C or more, more preferably 200 °C or more, more preferably 210 °C or more, more preferably 220 °C or more, more preferably 230 °C or more, more preferably 240 °C or more, more preferably 250 °C or more, more preferably 260 °C or more, more preferably 270 °C or more, more preferably 280 °C or more, more preferably 290 °C or more, more preferably 300 °C or more, more preferably 310 °C or more, more preferably 320 °C or more, more preferably 330 °C or more; and / or, in the heating step iv), the mixture M1 is heated to a temperature TO of 330 °C or less, preferably 320 °C or less, preferably 310 °C or less, preferably 300 °C or less, preferably 290 °C or less, preferably 280 °C or less, preferably 270 °C or less, preferably 260 °C or less, preferably 250 °C or less, preferably 240 °C or less, preferably 230 °C or less, preferably 220 °C or less, preferably 210 °C or less, preferably 200 °C or less, preferably 190 °C or less, preferably 180 °C or less, preferably 170 °C or less, preferably 160 °C or less, preferably 150 °C or less.The inventors recognized that if the temperature is high, the yield is improved and the separation of the compound C1 to C3 is improved.In a preferred embodiment, in the heating step iv), the mixture M1 is heated to temperature TO for a time tO of 5 s or more, preferably 30 s or more, more preferably 1 min or more, more preferably 3 min or more, more preferably 5 min or more, more preferably 8 min or more, more preferably 10 min or more, more preferably 25 min or more, more preferably 50 min or more, more preferably 75 min or more, more preferably 100 min or more, more preferably 150 min or more, more preferably 200 min or more, more preferably 250 min or more, more preferably 300 min or more,more preferably 400 min or more, more preferably 500 min or more, more preferably 600 min or more; and / or, in the heating step iv), the mixture M1 is heated to temperature TO for a time tO of 1000 min or less, preferably 500 min or less, more preferably 250 min or less, more preferably 100 min or less, more preferably 30 min or less, more preferably 20 min or less, more preferably 10 min or less, more preferably 5 min or less, more preferably 1 min or less. The inventors recognized that if the reaction time is long, the yield is improved and the separation of the compound C1 to C3 is improved. However, if the reaction time is short, the quality of the glass fibers is improved, and thus, the polymer composition or product comprising the obtained recycled glass fibers exhibits improved mechanical properties.In a preferred embodiment, in the heating step iv), a pressure pO, preferably during heating to temperature TO and / or for a time tO, is set to 10 bar or more, preferably 20 bar or more, more preferably 30 bar or more, more preferably 40 bar or more, more preferably 50 bar or more, more preferably 60 bar or more, more preferably 70 bar or more, more preferably 80 bar or more, more preferably 90 bar or more, more preferably 100 bar or more, more preferably 110 bar or more, more preferably 120 bar or more, more preferably 130 bar or more; and / or, in the heating step iv), a pressure pO, preferably during heating to temperature TO and / or for a time tO, is set to 400 bar or less, preferably 300 bar or less, more preferably 200 bar or less, more preferably 150 bar or less, more preferably 120 bar or less, more preferably 110 bar or less, more preferably 100 bar or less, more preferably 80 bar or less, more preferably 60 bar or less, more preferably 40 bar or less. Thus, the yield is improved and the separation of the compound C1 to C3 is improved. The pressure can be set by using an autoclave and adding a gas, preferably an inert gas, more preferably nitrogen.In a preferred embodiment, the method comprises the step:C1-vi) purifying and / or converting compound C1 to obtain a compound C1 ’ comprising, preferably consisting of, the glass fibers GFT.Thus, the quality of the glass fibers is improved, and thus, the polymer composition or product comprising the obtained recycled glass fibers exhibits improved mechanical properties.In a preferred embodiment, the step C 1 -vi) comprises, preferably is, the step:C1-vi’) heating the compound C1 to obtain the compound CT comprising, preferably consisting of, (the) glass fibers GF1”.Thus, the quality of the glass fibers is improved, and thus, the polymer composition or product comprising the obtained recycled glass fibers exhibits improved mechanical properties.In a preferred embodiment, in the heating step C1-vi’), the compound C1 is heated to a temperature T1 of 150°C or more, preferably 175°C or more, more preferably 200°C or more, more preferably 225°C or more, more preferably 250°C or more, more preferably 275°C or more, more preferably 300°C or more, more preferably 325°C or more, more preferably 350°C or more, more preferably 375°C or more, more preferably 400°C or more, more preferably 500°C or more; and / or, in the heating step C 1 -vi’), the compound C1 is heated to a temperature T 1 of 1000°C or less, preferably 750°C or less, more preferably 500°C or less, more preferably 475°C or less, more preferably 450°C or less, more preferably 425°C or less, more preferably 400°C or less, more preferably 375°C or less, more preferably 350°C or less, more preferably 325°C or less, more preferably 300°C or less. The inventors recognized that if the temperature is high, e.g. 150°C or more, preferably 175°C or more, more preferably, 200°C or more, more preferably, 225°C or more, the polymer is (almost) completely removed. Thus, the quality of the glass fibers is improved, and thus,the polymer composition or product comprising the obtained recycled glass fibers exhibits improved mechanical properties. If the temperature is very high, e.g. 200°C or more, preferably 225°C or more, more preferably 250°C or more, more preferably 275°C or more, more preferably 300°C or more, more preferably 325°C or more, more preferably 350°C or more, more preferably 375°C or more, more preferably 400°C or more, more preferably 500°C or more, in addition, the size is also (almost) completely removed. Thus, the quality of the glass fibers is further improved, and thus, the polymer composition or product comprising the obtained recycled glass fibers exhibits further improved mechanical properties. In contrast, if the temperature is low, e.g. 1000°C or less, preferably 750°C or less, more preferably 500°C or less, the glass fibers are less damaged and consequently, the quality of the glass fibers is further improved, and thus, the polymer composition or product comprising the obtained recycled glass fibers exhibits further improved mechanical properties.In a preferred embodiment, in the heating step C1-vi’), the compound C1 is heated to temperature T1 for a time t1 of 5 s or more, preferably 30 s or more, more preferably 1 min or more, more preferably 3 min or more, more preferably 5 min or more, more preferably 8 min or more, more preferably 10 min or more, more preferably 25 min or more, more preferably 50 min or more, more preferably 75 min or more, more preferably 100 min or more, more preferably 150 min or more, more preferably 200 min or more, more preferably 250 min or more, more preferably 300 min or more, more preferably 400 min or more, more preferably 500 min or more, more preferably 600 min or more; and / or, in the heating step C1-vi’), the compound C1 is heated to temperature T1 for a time t1 of 1000 min or less, preferably 500 min or less, more preferably 250 min or less, more preferably 100 min or less, more preferably 30 min or less, more preferably 20 min or less, more preferably 10 min or less, more preferably 5 min or less, more preferably 1 min or less. The inventors recognized that if the time is long, the polymer and / or size is (almost) completely removed. Thus, the quality of the glass fibers is improved, and thus, the polymer composition or product comprising the obtained recycled glass fibers exhibits improved mechanical properties. In addition, if the time is short, the quality of the glass is further improved, and thus, the polymer composition or product comprising the obtained recycled glass fibers exhibits further improved mechanical properties.In a preferred embodiment, in the heating step heating step C1-vi’, a pressure p1 , preferably during heating to temperature T 1 and / or for time t1 , is set to 1 bar or more, preferably 10 bar or more, more preferably 20 bar or more, more preferably 30 bar or more, more preferably 40 bar or more, more preferably 50 bar or more, more preferably 60 bar or more, more preferably 70 bar or more, more preferably 80 bar or more, more preferably 90 bar or more, more preferably 100 bar or more, more preferably 110 bar or more, more preferably 120 bar or more, more preferably 130 bar or more; and / or in the heating step heating step C1-vi’, a pressure p1 , preferably during heating to temperature T1 and / or for time t1 , is set to 400 bar or less, preferably 300 bar or less, more preferably 200 bar or less, more preferably 150 bar or less, more preferably 120 bar or less, more preferably 110 bar or less, more preferably 100 bar or less, more preferably 80 bar or less, more preferably 60 bar or less, more preferably 40 bar or less. Thus, the yield is improved. The pressure can be set by using an autoclave and adding a gas, preferably an inert gas, more preferably nitrogen.In a preferred embodiment, the step C 1 -vi) comprises, preferably is, the step:C1-vi”) sizing the compound C1 and / or the compound C1” to obtain a compound CT comprising the glass fibers GFT.Thus, the quality of the glass fibers is improved, and thus, the polymer composition or product comprising the obtained recycled glass fibers exhibits improved mechanical properties. This is particularly true, if the size was removed (almost) completely before sizing the glass fibers.In a preferred embodiment, the sizing comprises, preferably consists of, unmodified starch, modified starch, ethylene vinyl acetate, polyester, epoxy resin, polyurethane, siloxane or silane; or mixtures thereof, preferably siloxane and / or silane; and / or the sizing comprises, preferably consists of, an antistatic agent, binding agent, lubricant, or adhesion promoter; or mixtures thereof, preferably an antistatic agent, lubricant, or adhesion promoter; or mixtures thereof, more preferably an adhesion promoter. Thus, the quality of the glass fibers is improved, and thus, the polymer composition or product comprising the obtained recycled glass fibers exhibits improved mechanical properties.In a preferred embodiment, the sizing does not comprise a binding agent.In a preferred embodiment, the step C 1 -vi) comprises, preferably is, the step: adjusting the length of the glass fibers GF1 and / or the glass fibers GF1 ’ and / or the glass fibers GF1”, preferably wherein the adjusting step comprises one or more step(s) selected from comminuting, cutting, sieving, grinding, chopping, and remelting, preferably comminuting, cutting, sieving, grinding and chopping.Thus, the quality of the glass fibers is improved, and thus, the polymer composition or product comprising the obtained recycled glass fibers exhibits improved mechanical properties.In a preferred embodiment, the compound CT exhibits a ratio [weight-% / weight-%] of the sizing to the glass fibers GF1 ’ of 10.00 or less, preferably 5.00 or less, more preferably 4.00 or less, more preferably 3.00 or less, more preferably 2.00 or less, more preferably 1.00 or less, more preferably 0.50; and / or the compound CT exhibits a ratio [weight- % / weight-%] of the sizing to the glass fibers GFT of 0.01 or more, preferably 0.1 or more, more preferably 0.2 or more, more preferably 0.3 or more, more preferably 0.4 or more, more preferably 0.5 or more, more preferably 1 .0 or more. Thus, the quality of the glass fibers is improved, and thus, the polymer composition or product comprising the obtained recycled glass fibers exhibits improved mechanical properties.In a preferred embodiment, the average length of the glass fibers GF1 , GFT, and / or GF1” is / are 20 pm or more, preferably 50 pm or more, more preferably 100 pm or more, more preferably 200 pm or more, more preferably 300 pm or more, more preferably 400 pm or more, more preferably 500 pm or more, more preferably 1000 pm or more, more preferably 2000 pm or more, more preferably 3000 pm or more, more preferably 4000 pm or more; and / or the average length of the glass fibers GF1 , GFT, and / or GF1” is / are 10 mm or less, preferably 8 mm or less, more preferably 8 mm or less, more preferably 6 mm or less, more preferably 4 mm or less, more preferably 2 mm or less, more preferably 1000 pm or less, more preferably 7500 pm or less, more preferably 500 pm or less, more preferably 400 pm or less, more preferably 300 pm or less, more preferably 200 pm or less, more preferably 100 pm or less, more preferably 50 pm or less. Thus, the quality of the glass fibers is improved, and thus, the polymer composition or product comprising the obtained recycled glass fibers exhibits improved mechanical properties.In a preferred embodiment, the method comprises the step: vii) mixing and / or polymerizing a mixture M3, comprising, preferably consisting of, compound C1 , compound CT, or compound C1”; or a mixture thereof, preferably compound CT, to obtain a polymer composition PC1 .Thus, the closed loop recycling content is enhanced.In a preferred embodiment, in the step v, (at least) a / the compound C2 is obtained; and / or wherein, in the step v’, (at least) a / the compound C2 is provided.In a preferred embodiment, the step vi) comprises, preferably is, the step:C2-vi) purifying and / or converting the compound C2 to obtain a compound C2’ comprising, preferably consisting of, a / the monomer A, preferably and a / the monomer B; and / or oligomers thereof.In a preferred embodiment, the step vi) and / or C2-vi) comprise(s), preferably is / are, the step:C2-vi’) diluting, centrifuging, distilling, filtrating, extracting, performing an adsorptive cleaning, and / or hydrotreating the compound C2 to obtain compound C2’ comprising, preferably consisting of, the monomer A, preferably and monomer B; and / or oligomers thereof.In a preferred embodiment, the step vi) comprises, preferably is, the step: vi) purifying and / or converting the compound C3 to obtain a compound C3’ comprising the monomer X and / or one or more additive(s) AD1.Thus, less waste is produced.In a preferred embodiment, the step vi) comprises, preferably is, the step:C3-vi) purifying and / or converting the compound C3 to obtain a compound C3’ comprising, preferably consisting of, the monomer X and / or the one or more additive(s) AD1.Thus, less waste is produced.In a preferred embodiment, the step C3-vi) comprises, preferably is, the step:C3-vi’) recycling the compound C3 to obtain a compound C3’ comprising a monomer X and / or one or more additive(s) AD1.Thus, less waste is produced.The recycling in the recycling step C3-vi’ is not particularly limited and may include mechanical recycling, solvent based recycling, thermomechanical recycling, thermochemical recycling and chemical recycling. In a preferred embodiment, the step C3-vi) and / or the step C3-vi’) comprise(s), preferably is / are, the steps:C3-vi”) pyrolyzing and / or gasifying the compound C3 to obtain a mixture MX, andC3-vi”’) converting the mixture MX to a obtain compound C3’ comprising a monomer X and / or one or more additive(s) AD1.Thus, less waste is produced and the PCF is reduced. The method(s) for the pyrolyzing, gasifying and / or converting are well known to a person skilled in the art and any method known to a person skilled in the art can be used.In a preferred embodiment, the method comprises the step: vii) polymerizing a mixture M3 comprising compound C3’ to obtain a polymer composition PC1. Thus, the closed loop recycling content is enhanced and the PCF is reduced.In a preferred embodiment, the method comprises the step: ii) sorting the waste stream WO to obtain a waste stream W1.Thus, the mechanical properties are improved.In a preferred embodiment, in the sorting step, the content of a / the polymer PO and / or (the) glass fibers GFO is / are enhanced, preferably by using infrared IR techniques and / or sorting by density and / or sorting by color and / or flotation and / or ballistic separation, preferably by using infrared IR, preferably near infrared NIR and / or mid infrared MIR, more preferably mid infrared MIR, techniques.In a preferred embodiment, the method comprises the step: vii) mixing and / or polymerizing a mixture M3, comprising, preferably consisting of, compound C1, CT, C1”, C2, C2’, C3 or C3’; or a mixture thereof, to obtain a polymer P1 and / or a polymer composition PC1 comprising a / the polymer P1 , preferably wherein the step vii) comprises, preferably is, the step: vii) mixing a mixture M3, comprising, preferably consisting of, compound C1 , CT, C1”, C2, C2’, C3 or C3’; or a mixture thereof, to obtain a polymer P1 and / or a polymer composition PC1 comprising a / the polymer P1 , preferably a polymer composition PC1 comprising a / the polymer P1.In a preferred embodiment, the step vii) comprises, preferably is, the step: vii) polymerizing a mixture M3, comprising, preferably consisting of, compound C1, C1 ’, C1 ”, C2, C2’, C3 or C3’; or a mixture thereof, to obtain a polymer P1 and / or a polymer composition PC1 comprising a / the polymer P1 .In a preferred embodiment, the method comprises the step: viii) converting the polymer P1 and / or the polymer composition PC1, preferably obtainable by or obtained by a method described herein, to obtain a product PRF1 .In a preferred embodiment, the method is a method for recycling of a waste stream and / or the production of (a) recycled glass fibers, monomer(s), polymer(s), polymer composition(s) and / or a polymer product(s).In a preferred embodiment, the waste stream WO is automotive shredder residue, preferably polymer enriched automotive shredder residue, and / or mixed plastic waste and / or post-consumer waste and / or scrap tires and / or household waste and / or electronic waste, preferably automotive shredder residue, more preferably polymer enriched automotive shredder residue. Thus, less waste is produced.In a preferred embodiment, the waste stream WO is derived from a product WP and the product PRF1 and the product WP are the same; and / or the waste stream WO is derived from a type of product WTP and the kind or type of the product PRF1 and the kind or type of the product WTP are the same, preferably wherein the type of products WTP and PRF1 is a part of an automotive or a part of a construction or a part of a housing or a packaging or a part of a packaging or a textile, more preferably a part of an automotive; and / or the method is a method for the production of a product, preferably product PRF1, comprising closed loop recycling content, and / or the product PRF1 comprises closed loop recycling content, preferably derived from the waste stream WO, preferably waste stream W1 .In a preferred embodiment, the waste stream WO and / or the waste stream W1 comprise(s) 30 weight-% or more, preferably 40 weight-% or more, more preferably 50 weight-% or more, more preferably 60 weight-% or more, more preferably 70 weight-% or more, more preferably 80 weight-% or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more, more preferably 98 weight-% or more, glass fibers GFO and / or, preferably and, polymer P0; and / or the waste stream WO and / or the waste stream W1 comprise(s) 100 weight-% or less, preferably 99 weight-% or less, more preferably 95 weight-% or less, more preferably 90 weight-% or less, more preferably 80 weight- % or less, more preferably 70 weight-% or less, more preferably 60 weight-% or less, more preferably 50 weight-% or less, glass fibers GFO and / or, preferably and, polymer P0. Thus, the yield and turnover are improved.In a preferred embodiment, in the waste stream W0 and / or the waste stream W1 , the average glass fiber length of the glass fibers GFO is 0.01 mm or more, preferably 0.05 mm or more, more preferably 0.1 mm or more, more preferably 0.2 mm or more, more preferably 0.3 mm or more, more preferably 0.4 mm or more, more preferably 0.5 mm or more, more preferably 0.6 mm or more, more preferably 0.8 mm or more, more preferably 1 .0 mm or more, more preferably 5 mm or more, more preferably 10 mm or more, more preferably 20 mm or more, more preferably 40 mm or more; and / or, in the waste stream W0 and / or the waste stream W1, the average glass fiber length of the glass fibers GFO is 100 mm or less, preferably 10 mm or less, more preferably 9 mm or less, more preferably 8 mm or less, more preferably 7 mm or less, more preferably 6 mm or less, more preferably 5 mm or less, more preferably 4 mm or less, more preferably 3 mm or less, more preferably 2 mm or less, more preferably 1 mm or less. Thus, less waste is produced and the mechanical properties are improved.In a preferred embodiment, the mixture M1 comprises a ratio (weight-% / weight-%) of waste stream W0, preferably waste stream W1 , to composition CO of 0.01 or more, preferably 0.05 or more, more preferably 0.10 or more, more preferably 0.20 or more, more preferably 0.50 or more, more preferably 0.75 or more, more preferably 1.00 or more; and / or the mixture M1 comprises a ratio (weight-% / weight-%) of waste stream W0, preferably waste stream W1 , to composition CO of 10 or less, preferably 5 or less, more preferably 3 or less, more preferably 1 or less, more preferably 0.5 or less, more preferably 0.1 or less. Thus, the yield and turnover are improved.In a preferred embodiment, the mixture M2 comprises the glass fibers GF1 , monomer A, preferably and monomer B; and / or oligomers thereof, and residue R, preferably wherein a content of the glass fibers GF1 , monomer A, preferably and monomer B; and / or oligomers thereof, is 10 weight-% or more, preferably 20 weight-% or more, more preferably 30 weight-% or more, more preferably 40 weight-% or more, more preferably 50 weight-% or more, more preferably 60 weight-% or more, more preferably 70 weight-% or more, more preferably 80 weight-% or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more, more preferably 98 weight-% or more. Thus, the yield and turnover are improved.In a preferred embodiment, the mixture M3 comprises compound C1, CT, or CT, or a mixture thereof, preferably CT. Thus, the closed loop recycling content is enhanced, the PCF is reduced.In a preferred embodiment, the mixture M3 comprises compound C2 or C2’, or a mixture thereof, preferably C2’. Thus, the closed loop recycling content is enhanced, the PCF is reduced.In a preferred embodiment, the mixture M3 comprises compound C3 or C3’, or a mixture thereof, preferably C3’. Thus, the closed loop recycling content is enhanced, the PCF is reduced.In a preferred embodiment, the mixture M3 comprises polymer P1. Thus, the mechanical properties are improved.In a preferred embodiment, the mixture M3 comprises one or more additive(s) AD1. Thus, the mechanical properties are improved.In a preferred embodiment, the mixture M3 comprises monomer A, preferably and monomer B; and / or oligomers thereof. Thus, the closed loop recycling content is enhanced and the PCF is reduced.In a preferred embodiment, the mixture M3 comprises monomer X. Thus, the closed loop recycling content is enhanced and the PCF is reduced.In a preferred embodiment, the mixture M3 comprises the glass fibers GF1, the glass fibers GFT and / or the glass fibers GF1”, more preferably the glass fibers GF1 ’ and / or the glass fibers GF1”, more preferably the glass fibers GF1 Thus, the mechanical properties are improved, the closed loop recycling content is enhanced and the PCF is reduced.In a preferred embodiment, the mixture M3 comprises, preferably consists of, in weight-%:40 to 100, preferably 50 to 90, more preferably 60 to 80 monomer A, preferably and monomer B; and / or oligomers thereof,0 to 30, preferably 1 to 20, more preferably 3 to 15 monomer X,O to 60, preferably 1 to 50, more preferably 15 to 40 glass fibers GF1 , glass fibers GFT and / or glass fibersGF1”, more preferably glass fibers GFT and / or glass fibers GF1”, more preferably glass fibers GFT; and 0 to 30, preferably 1 to 20, more preferably 3 to 15 one or more additive(s) AD 1.Thus, the improved mechanical properties are improved, the closed loop recycling content is enhanced, the PCF is reduced and the recycling content is higher than the content of the polymer.In a preferred embodiment, the mixture M3 comprises polymer P1 , preferably comprises, more preferably consists of, in weight-%:40 to 100, preferably 50 to 90, more preferably 60 to 80 polymer P1 ,O to 60, preferably 1 to 50, more preferably 15 to 40 glass fibers GF1 , glass fibers GFT and / or glass fibers GF1”, more preferably glass fibers GFT and / or glass fibers GF1”, more preferably glass fibers GFT; and 0 to 30, preferably 1 to 20, more preferably 3 to 15 one or more additive(s) AD 1.In a preferred embodiment, the one or more additive(s) AD1 is / are selected from fiber(s), antioxidating agent(s), stabilizers), lubricant(s), mineral(s), colorant(s), pigment(s), dye(s), soot, talc, carbon black, bio additive(s), plasticizer(s), flame retardant(s), and mixtures thereof.In a preferred embodiment, the one or more additive(s) AD1 comprises glass fibers vGF, preferably wherein the vGF fibers are bundled glass fiber(s), virgin glass fiber(s) and / or non-recyded glass fiber(s), preferably wherein a ratio(weight-% / weight-%) of a content of the glass fiber(s) vGF to a content of the glass fibers GF1, the glass fibers GF1 ’ and / or the glass fibers GF1”, more preferably the glass fibers GF1 ’ and / or the glass fibers GF1”, more preferably the glass fibers GF1 ’, in the mixture M3 and / or the polymer compound PC1 and / or the polymer product PRF1 is 0.01 to 100, preferably 0.1 to 10, more preferably 0.5 to 5, more preferably about 1. Thus, the improved mechanical properties are improved and the closed loop recycling content is enhanced.In a preferred embodiment, the one or more additive(s) AD1 are at least partially obtained and / or obtainable by a method described herein. Thus, the closed loop recycling content is enhanced and the recycling content is higher than the content of the polymer.In a preferred embodiment, in the mixture M3 and / or the polymer composition PC1 and / or the product PRF1 , a ratio (weight-% / weight-%) of a content of the one or more additive(s) AD1 obtained by a method described herein to a content of the entire one or more additive(s) AD1 is 0.001 or more, preferably 0.005 or more, more preferably 0.010 or more, more preferably 0.050 or more, more preferably 0.100 or more, more preferably 0.500 or more, more preferably 0.750 or more, more preferably 0.850 or more, more preferably 0.950 or more, more preferably 1 or more, more preferably 10 or more, more preferably 50 or more. Thus, the closed loop recycling content is enhanced and the recycling content is higher than the content of the polymer.In a preferred embodiment, in the mixture M3 and / or the polymer composition PC1 and / or the product PRF1 , a ratio (weight-% / weight-%) of a content of the entire one or more additive(s) AD1 to a content of the one or more additive(s) AD1 obtained by a method described herein is 0.001 or more, preferably 0.005 or more, more preferably 0.010 or more, more preferably 0.050 or more, more preferably 0.100 or more, more preferably 0.500 or more, more preferably 0.750 or more, more preferably 0.850 or more, more preferably 0.950 or more, more preferably 1 or more, more preferably 10 or more, more preferably 50 or more. Thus, the closed loop recycling content is enhanced and the recycling content is higher than the content of the polymer.In a preferred embodiment, the composition CO is a depolymerizing composition.In a preferred embodiment, the composition CO at least partially, preferably completely, depolymerizes the polymer P0. Thus, the yield is increased. The polymer P0 may be at least partially depolymerized to obtain a mixture of monomer A, preferably and monomer B; and / or oligomers thereof; or the polymer P0 may be completely depolymerized to obtain monomer A, preferably and monomer B.In a preferred embodiment, the composition CO comprises, preferably consists of, water, preferably 0.1 weight-% or more and 100 weight-% or less, more preferably 1 weight-% or more and 95 weight-% or less, more preferably 5 weight-% or more and 80 weight-% or less, more preferably 10 weight-% or more and 70 weight-% or less, more preferably 15 weight-% or more and 50 weight-% or less, more preferably 20 weight-% or more and 40 weight-% or less, water. Thus, the glass fibers are preserved and the yield and turnover are improved. Especially, if the polymer P0 is a polyamide, preferably PA 66, the yield and turnover are improved.In a preferred embodiment, the composition CO comprises a solvent, preferably wherein the solvent is an alcohol, more preferably methanol, more preferably 1 weight-% or more and 99 weight-% or less, more preferably 20 weight-% or more and 95 weight-% or less, more preferably 40 weight-% or more and 90 weight-% or less, more preferably 60 weight-% or more and 85 weight-% or less, more preferably 70 weight-% or more and 80 weight-% or less, solvent, preferably wherein the solvent is an alcohol, more preferably methanol. Thus, the glass fibers are preserved and the yield and turnover are improved.In a preferred embodiment, the composition CO comprises a base, preferably an alkali hydroxide, more preferably NaOH, more preferably 0.1 weight-% or more and 25 weight-% or less, more preferably 0.5 weight-% or more and 20 weight-% or less, more preferably 1 .0 weight-% or more and 15 weight-% or less, more preferably 3 weight-% or more and 10 weight-% or less, more preferably 5 weight-% or more and 7 weight-% or less, base, preferably alkali hydroxide, more preferably NaOH. Thus, the yield and turnover are improved.In a preferred embodiment, the composition CO comprises an acid, preferably HCI, more preferably 0.1 weight-% or more and 25 weight-% or less, more preferably 0.5 weight-% or more and 20 weight-% or less, more preferably 1.0 weight-% or more and 15 weight-% or less, more preferably 3 weight-% or more and 10 weight-% or less, more preferably 5 weight-% or more and 7 weight-% or less, acid, preferably HCI. Thus, the yield and turnover are improved.In a preferred embodiment, the composition CO does not comprise any acid and base and / or wherein the composition CO consists of water and / or a solvent, preferably wherein the solvent is an alcohol, more preferably methanol, more preferably the composition CO consists of water. Thus, the glass fibers are preserved.In a preferred embodiment, a content of the glass fibers GF1 in the compound C1 is 50 weight-% or more, preferably 60 weight-% or more, more preferably 70 weight-% or more, more preferably 80 weight-% or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more, more preferably 98 weight-% or more, more preferably wherein the compound C1 consists of the glass fibers GF1. Thus, less waste is produced and the mechanical properties and purity are improved.In a preferred embodiment, a content of the glass fibers GFT in the compound C1 ’ is 50 weight-% or more, preferably 60 weight-% or more, more preferably 70 weight-% or more, more preferably 80 weight-% or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more, more preferably 98 weight-% or more, more preferably wherein the compound C1 ’ consists of the glass fibers GFT. Thus, less waste is produced and the mechanical properties and purity are improved.In a preferred embodiment, a content of the glass fibers GF1” in the compound C1” is 50 weight-% or more, preferably 60 weight-% or more, more preferably 70 weight-% or more, more preferably 80 weight-% or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more, more preferably 98 weight-% or more. Thus, less waste is produced and the mechanical properties and purity are improved.In a preferred embodiment, a content of the glass fibers GF1’, in weight-%, in the compound C1’ is higher than a content of the of the glass fibers GF1, in weight-%, in the compound C1. Thus, the mechanical properties of the polymer P1 and / or polymer composition PC1 is improved.In a preferred embodiment, a content of the monomer A, preferably and monomer B; and / or oligomers thereof, in weight-%, in the compound C2’ is higher than a content of the of the monomer A, preferably and monomer B; and / or oligomers thereof, in weight-%, in the compound C2. Thus, the mechanical properties of the polymer P1 and / or polymer composition PC1 is improved.In a preferred embodiment, a content of the monomer X and / or one or more additive(s) AD1 , in weight-%, in the compound C3’ is higher than a content of the of the monomer X and / or one or more additive(s) AD1 , in weight-%, in the compound C3. Thus, the mechanical properties of the polymer P1 and / or polymer composition PC1 is improved.In a preferred embodiment, a content of the monomer A, preferably and monomer B; and / or oligomers thereof, in the compound C2 and / or compound C2’ is / are 50 weight-% or more, preferably 60 weight-% or more, more preferably 70 weight-% or more, more preferably 80 weight-% or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more, more preferably 98 weight-% or more. Thus, less waste is produced and the mechanical properties and purity are improved.In a preferred embodiment, the compound C2 and / or C2’ comprise(s), preferably consist(s) of, a / the monomer A, preferably and monomer B.In a preferred embodiment, the compound C2 and / or C2’ comprise(s), preferably consist(s) of, oligomers of monomer A, preferably and monomer B.In a preferred embodiment, a content of the residue R in the compound C3 is 50 weight-% or more, preferably 60 weight-% or more, more preferably 70 weight-% or more, more preferably 80 weight-% or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more, more preferably 98 weight-% or more, more preferably wherein the compound C3 consists of residue R. Especially, if the content of the residue is high, the separation is improved und thus, less waste is produced and the yield and turnover are improved.In a preferred embodiment, a content of glass fibers GF1 , monomer A, preferably and monomer B; and oligomers thereof, in the residue R is 10 weight-% or less, preferably 5 weight-% or less, more preferably 2 weight-% or less, more preferably 1 weight-% or less, more preferably 0.5 weight-% or less, more preferably 0.1 weight-% or less, more preferably 0.01 weight-% or less, more preferably wherein the residue R does not contain glass fibers GF1 , monomer A, preferably and monomer B; and oligomers thereof.In a preferred embodiment, a content of the elements C, H, N, O, and S, preferably C and H, preferably measured via elemental analysis, in the residue R, preferably the compound 03, is 50 weight-% or more, preferably 60 weight-% or more, more preferably 70 weight-% or more, more preferably 80 weight-% or more, more preferably 90 weight-% ormore, more preferably 95 weight-% or more, more preferably 98 weight-% or more. Thus, the pyrolyzing and / or gasifying step(s) are more efficient and the yield and turnover are improved.In a preferred embodiment, a content of the monomer A, preferably and monomer B; and oligomers thereof, and / or, preferably and, the glass fibers GF1 in the residue R, preferably the compound C3, is 50 weight-% or less, preferably 40 weight-% or less, more preferably 30 weight-% or less, more preferably 20 weight-% or less, more preferably 15 weight-% or less, more preferably 10 weight-% or less, more preferably 8 weight-% or less, more preferably 5 weight- % or less, more preferably 3 weight-% or less, more preferably 1 weight-% or less, more preferably 0.5 weight-% or less, more preferably 0.1 weight-% or less. Thus, the separation is improved and consequently, the yield and turnover are improved.In a preferred embodiment, a content of water in the residue R, preferably the compound C3, is 50 weight-% or less, preferably 40 weight-% or less, more preferably 30 weight-% or less, more preferably 20 weight-% or less, more preferably 15 weight-% or less, more preferably 10 weight-% or less, more preferably 8 weight-% or less, more preferably 5 weight-% or less, more preferably 3 weight-% or less, more preferably 1 weight-% or less, more preferably 0.5 weight- % or less, more preferably 0.2 weight-% or less, more preferably 0.1 weight-% or less, more preferably 0.05 weight-% or less, more preferably 0.01 weight-% or less. Thus, the separation is improved and consequently, the yield and turnover are improved.In a preferred embodiment, the compound C3’ comprises the monomer X, preferably wherein a content of the monomer X in the compound C3’ is 50 weight-% or more, preferably 60 weight-% or more, more preferably 70 weight-% or more, more preferably 80 weight-% or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more, more preferably 98 weight-% or more, more preferably wherein the compound C3’ consists of monomer X. Thus, the mechanical properties and purity are improved.In a preferred embodiment, the compound C3’ comprises the one or more additive(s) AD1, preferably wherein a content of the one or more additive(s) AD1 in the compound C3’ is 50 weight-% or more, preferably 60 weight-% or more, more preferably 70 weight-% or more, more preferably 80 weight-% or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more, more preferably 98 weight-% or more, more preferably wherein the compound C3’ consists of one or more additive(s) AD1. Thus, the mechanical properties and purity are improved and the recycling content is higher than the content of the polymer.In a preferred embodiment, the polymer composition PC1 and / or the product PRF1 comprises, preferably consists of, in weight-%:40 to 100, preferably 50 to 90, more preferably 60 to 80 polymer P1 ,0 to 60, preferably 1 to 50, more preferably 15 to 40 compound C1 , compound CT and / or compound C1 ”, more preferably compound CT and / or compound C1”, more preferably compound C1”; and 0 to 30, preferably 1 to 20, more preferably 3 to 15 one or more additive(s) AD 1.Thus, the mechanical properties are improved.In a preferred embodiment, the polymer PO and the polymer P1 are the same.In a preferred embodiment, the polymer PO and / or the polymer P1 is / are polyamide (PA), polyisocyanate polyaddition product; preferably polyurethane (PU), thermoplastic polyurethane (TPU), polyurea or polyisocyanurate (PIR); mela- mine-formaldehyde resins (MF), low-density polyethylene (LDPE), high-density polyethylene (HDPE), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyvinyl acetate (PVA), polystyrene (PS), poly acrylonitrile butadiene styrene (ABS), poly styrene acrylonitrile (SAN), poly acrylate styrene acrylonitrile (ASA), polytetrafluoroethylene (PTFE), poly(methyl acrylate) (PMA), poly(methyl methacrylate) (PM MA), polybutadiene (BR, PBD), poly(cis-1,4-iso- prene), poly(trans-1,4-isoprene), polyoxymethylene (POM), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), aromatic-aliphatic polyester; preferably polybutylene adipate coterephthalate (PBAT), or polybutylene sebacinate coterephthalate (PBSeT); aliphatic polyester; preferably polybutylene succinate (PBS); polybutylene adipate cosuccinate (PBSA), polyester (PES), polyether sulfone (PESU), polyhydroxyalkanoate (PHA), poly-3-hydroxy- butyrate (P3HB), poly-4-hydroxybutyrate (P4HB), polyhydroxyvalerate (PHV), polyhydroxyhexanoate (PHH), polyhydroxyoctanoate (PHO), polylactic acid (PLA), polysulfone (PSU), polyphenylene sulfone (PPSU), polycarbonate (PC), polyether ether ketone (PEEK), poly(p-phenylene oxide) (PPO), poly(p-phenylene ether) (PPE); or copolymers or mixtures thereof.In a preferred embodiment, the polymer PO and / or the polymer P1 is / are PA 4, PA 5, PA 6, PA 7, PA 8, PA 9, PA 10, PA 11, PA 12, PA 2.2, PA 4.6, PA 5.6, PA 5.10, PA 5.12, PA 6.6, PA 6 / 6.6, PA 6.6 / 6, PA 6.6 / 6 / 6.10, PA 6.9, PA 6.10, PA 6.12, PA 6.13, PA 6 / 6.36, PA 9.6, PA 9.9, PA 9.10, PA 9.12, PA 10.12, PA 12.12, PA 12 / MACM.I (MACM = 3,3'- dimethyl-4,4'-diamino dicyclohexyl methane); I = isophthalic acid), PA 12 / MACM.T (T = terephthalic acid), PA 13.13, PA 6.T, PA 9.T, PA 8.T, PA 10.T, PA 12.T, PA 6.I, PA 8.I, PA 9.I, PA 10.1, PA 12.1, PA 6.T / 6, PA 6.T / 10, PA 6.T / 12, PA 6.T / 6.I, PA6.I / 6.T, PA 6.T / 8.T, PA 6.T / 9.T, PA 6.T / 10.T, PA 6.T / 12.T, PA 12.T / 6.T, PA 6.T / D.T (D = 2-methylpen- tamehtylen-1,5-diamine), PA 6-3.T (6-3 = trimethylhexamethylendiamine), PA 6.T / 6.I / 6, PA 6.T / 6.I / 12, PA 6. T / 6.1 / 6.10, PA 6.T / 6.I / 6.12, PA 6.T / 6.6, PA 6.6 / 6.T, PA 6.T / 6.10, PA 6.T / 6.12, PA 10.T / 6, PA 10.T / 11 , PA 10.T / 12, PA 8.T / 6.T, PA 8.T / 6.6, PA 8.T / 8.I, PA 8.T / 8.6, PA 8.T / 6.I, PA 10.T / 6.T, PA 10.T / 6.6, PA 10.T / 10.I, PA 10.T / 10.I / 6.T, PA 10.T / 6.I, PA 4.T / 4.I / 4.6, PA 4.T / 4.I / 6.6, PA 5.T / 5.I, PA 5.T / 5.I / 5.6, PA 5.T / 5.I / 6.6, PA 6.T / 6.I / 6.6, PA MXDA.6 (MXDA = m-xylylene- diamine), PA IPDA.I (IPDA = isophorone diamine), PA IPDA.T, PA MACM.I, PA MACM.T, PA MACM.10, PA MACM.36, PA PACM.10 (PACM = 4,4'-diaminodicyclohexylmethane), PA PACM.12, PA PACM.36, PA PACM.I, PA PACM.T, PA MXDA.I, PA MXDA.T, PA 6.T / IPDA.T, PA 6.T / MACM.T, PA 6.T / PACM.T, PA 6.T / MXDA.T, PA 6.T / 6.I / 8.T / 8.I, PA 6.T / 6.I / 10.T / 10.I, PA 6.T / 6.I / IPDA.T / IPDA.I, PA 6.T / 6.I / MXDA.T / MXDA.I, PA 6.T / 6.I / MACM.T / MACM.I, PA 6.T / 6.I / PACM.T / PACM.I, PA 6.T / 10.T / IPDA.T, PA 6.T / 12.T / I PDA.T, PA 6.T / 10.T / PACM.T, PA 6.T / 12.T / PACM.T, PA 10.T / I PDA.T, PA 12.T / I PDA.T, PA PDA.T (PDA = phenylendiamine); or copolymers or mixtures thereof; preferably PA 6, PA 66; or copolymers or mixtures thereof; more preferably PA 6.In a preferred embodiment, the polymer P0 and / or the polymer P1 is / are PA 66. In another preferred embodiment, the polymer P0 and / or the polymer P1 comprises PA 5.6. In yet another preferred embodiment the polymer P0 and / or the polymer P1 comprisesa mixture of PA 66 and PA 5.6. In yet another preferred embodiment the polymer P0 and / or the polymer P1 comprisesa mixture of PA 6 and PA 5.6.In a preferred embodiment, the polymer P1 and / or the polymer P0 is / are obtainable or obtained by polymerizing a mixture comprising the monomer A, preferably and monomer B; and / or oligomers thereof.In a preferred embodiment, the monomer A and / or B and / or X is / are selected from diols; preferably butandiol; polyols, aldehydes; preferably formaldehyde; amides; preferably caprolactam; sulfones; preferably 4,4'-dichlorodiphenyl sulfone; diamines; preferably hexamethylenediamine (HMD) and nonanediamine; diacids; preferably terephthalic acid and adipic acid; diisocyanates; preferably toluene diisocyanate (TDI) and diphenylmethane diisocyanate (MDI); preferably caprolactam, hexamethylenediamine (HMD) and adipic acid, more preferably caprolactam and hexamethylenediamine (HMD), more preferably is caprolactam. Especially, if the monomer A, preferably and B, is / are selected from caprolactam, hexamethylenediamine (HMD) and / or adipic acid; and the composition CO comprises water, preferably and wherein the composition CO does not comprise any acid and base, more preferably wherein the composition CO consists of water and / or a solvent, more preferably water, the glass fibers are preserved and thus, the mechanical properties of the polymer composition and product are improved.In a preferred embodiment, the monomer A is hexamethylenediamine (HMD); and / or, preferably and, the monomer B is adipic acid.In a preferred embodiment, the monomer A is adipic acid; and / or, preferably and, the monomer B is hexamethylenediamine (HMD).In a preferred embodiment, the product PRF1 is selected from: i) building block or monomer; or ii) polymer, preferably polymer A, polymer composition, preferably polymer composition A, or polymer product, preferably polymer product A; orHi) industrial use polymer, industrial use surfactant, descaling compound, industrial use biocide, industrial use solvent, industrial use dispersant, composition thereof or formulation thereof; or iv) agrochemical composition, agrochemical formulation auxiliary or agrochemically active ingredient; or v) active pharmaceutical ingredient or intermediate thereof, pharmaceutical excipient, animal feed additive, human food additive, dietary supplements, aroma chemical or aroma composition; or vi) aqueous polymer dispersion, preferably polyurethane or polyurethane - poly(meth)acrylate hybrid polymer dispersion, emulsion, binder for paper and fiber coatings, UV-curable acrylic polymer for hot melts and coatings polyisocyanates, hyperbranched polyester polyol, polymeric dispersant for inorganic binder compositions, unsaturated polyester polyol or 100% curable composition; or vii) cosmetic surfactant, emollient, wax, cosmetic polymer, UV filter, further cosmetic ingredient or composition or formulation thereof; or viii) polymer B, polymer composition B, coating composition, other functional composition, foil, molded body, coating or coated substrate.In a preferred embodiment, the product PRF1 is or is a part of: a part of an automotive; preferably cylinder head cover, engine cover, housing for charge air cooler, charge air cooler flap, intake pipe, intake manifold, connector, gear wheel, fan wheel, cooling water box, housing, housing part for heat exchanger, coolant cooler, charge air cooler, thermostat, water pump, radiator, fastening part, part of battery system for electromobility, dashboard, steering column switch, seat, headrest, center console, transmission component, door module, A, B, C or D pillar cover, spoiler, door handle, exterior mirror, windscreenwiper, windscreen wiper protection housing, decorative grill, cover strip, roof rail, window frame, sunroof frame, antenna panel, headlight and taillight, engine cover, cylinder head cover, intake manifold, airbag, cushion, or coating; a cloth; preferably shirt, trousers, pullover, boot, shoe, shoe sole, tight or jacket; an electrical part; preferably electrical or electronic passive or active component, circuit board, printed circuit board, housing component, foil, line, switch, plug, socket, distributor, relay, resistor, capacitor, inductor, bobbin, lamp, diode, LED, transistor, connector, regulator, integrated circuit (IC), processor, controller, memory, sensor, microswitch, microbutton, semiconductor, reflector housing for light-emitting diodes (LED), fastener for electrical or electronic component, spacer, bolt, strip, slide-in guide, screw, nut, film hinge, snap hook (snap-in), or spring tongue; a consumer, agricultural product or pharmaceutical product; preferably tennis string, climbing rope, bristle, brush, artificial grass, 3D printing filament, grass trimmer, zipper, hook and loop fastener, paper machine clothing, extrusion coating, fishing line, fishing net, offshore line and rope, vial, syringe, ampoule, bottle, sliding element, spindle nut, chain conveyor, plain bearing, roller, wheel, gear, roller, ring gear, screw and spring dampers, hose, pipeline, cable sheathing, socket, switch, cable tie, fan wheel, carpet, box or bottle for cosmetics, mattress, cushion, insulation, detergent, dishwasher tabs or powder, shampoo, body wash, shower gel, soap, fertilizer, fungicide, or pesticide; a packaging for the food industry; preferably mono- or multi-layer blown film, cast film (mono- or multi-layer), biaxially stretched film, or laminating film; or a part of a construction; preferably a rotor blade, insulating material, frame, housing, wall, coating, or separating wall; preferably wherein the product PRF1 is or is a part of: a part of an automotive; preferably cylinder head cover, engine cover, housing for charge air cooler, charge air cooler flap, intake pipe, intake manifold, connector, gear wheel, fan wheel, cooling water box, housing, housing part for heat exchanger, coolant cooler, charge air cooler, thermostat, water pump, radiator, fastening part, part of battery system for electromobility, dashboard, steering column switch, seat, headrest, center console, transmission component, door module, A, B, C or D pillar cover, spoiler, door handle, exterior mirror, windscreen wiper, windscreen wiper protection housing, decorative grill, cover strip, roof rail, window frame, sunroof frame, antenna panel, headlight and taillight, engine cover, cylinder head cover, intake manifold, airbag, cushion, or coating.Thus, the recycling content is enhanced.In a preferred embodiment, a content of the waste stream WO in the product PRF1 is 1 weight-% or more, preferably 2 weight-% or more, more preferably 5 weight-% or more, more preferably 15 weight-% or more, more preferably 30 weight-% or more, more preferably 40 weight-% or more, more preferably 60 weight-% or more, more preferably 80 weight-% or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more; and / or a content of the waste stream W0 in the product PRF1 is 100 weight-% or less, preferably 95 weight-% or less, more preferably 90 weight-% or less, more preferably 50 weight-% or less, more preferably 25 weight-% or less, more preferably 10 weight-% or less; andpreferably wherein the content is determined based on identity preservation and / or segregation and / or mass balance and / or book and claim chain of custody models, preferably based on mass balance, preferably the International Sustainability and Carbon Certification (ISCC) standard.In a preferred embodiment, the monomer X and the monomer A are the same.In a preferred embodiment, the monomer X and the monomer B are the same.The object is further at least partially solved by a use of a mixture M3, comprising compound C1 , C1 ’, C1”, C2, C2’, C3 or C3’; or a mixture thereof, in a mixing and / or polymerizing step to obtain a polymer P1 and / or a polymer composition PC1 comprising a / the polymer P1 , wherein compound C1 , CT, C1”, C2, C2’, C3 or C3’; or a mixture thereof, is / are obtained by or obtainable by a method described herein.The object is further at least partially solved by a monomer, preferably monomer A, B, or X, glass fibers, preferably glass fibers GF1 , GF1 ’ or GF”, a polymer, preferably polymer P1 , a polymer composition, preferably polymer composition PC1 , or product, preferably product PRF1 , obtained by or obtainable by a method described herein.Methods and DefinitionsIf not stated otherwise, normal conditions are used and / or applied, e.g., room temperature, preferably 25°C, and 1 bar, preferably 1013.25 mbar.If not stated otherwise, oligomers preferably comprise 2 to 100 repeating units (monomers, e.g. monomers A and / or monomers B), preferably 2 to 50 repeating units, more preferably 2 to 10 repeating units.The content of the monomer A, preferably and monomer B, monomer X and / or one or more additive(s) AD1 in weight- % in a compound is determined, after depolymerization, by GC-FID (gas chromatography - flame ionization detector).The content of glass fibers in a compound is determined by weigh the compound before and after pyrolyzing at 650°C for 1.5 h.Average glass fiber length is preferably determined as follows: First, the polymer compound comprising the glass fibers was pyrolyzed at 650°C for 1 .5 h to obtain the glass fibers. Then, a tip of a spatula (about 5 mg) glass fibers are dispersed in a mixture of 100 mL water and 2 drops of glycerin and transferred to a petri dish, which is placed on the surface of an Epson perfection V850 Pro flatbed scanner. This type of scanner is able to analyze the length of about 80 000 fibers at the same time. Fibers shorter than 21.2 pm cannot be detected due to the limited resolution of the scanner. Thus, fibers being shorter than 21 .2 pm are not considered.Calculation of the value:Average glass fiber length (=arith metic mean) = ( Ltotai) / ( Lfrequency); wherein Ltotai is the sum of the length (pm) of all fibers, andwherein Lfrequency is the sum of all fibers.The purifying and / or converting step iv) and the vii) mixing and / or polymerizing step v) can be performed by any method and is well known to a person skilled in the art. Preferably, (a) method(s) described herein and in Reference RF1 (see below) are used. For example, starting with pyrolysis oil derived from compound C3, caprolactam (monomer to produce PA6) can be obtained as follows:A Liquid feedstock comprising compound 03 is preferably pre-heated and / or pressurized to > 1 bar(abs.), more preferably to > 2 bar(abs.) and most preferably to about 4 bar(abs.) before fed into the at least one gasifier. Suitable means for pre-heating and / or pressurizing liquid feedstocks for feeding into said at least one gasifier are known in the art, comprise for example flaps and locks but also annual gaps, pressure nozzles and pressure atomizers, and can be adapted to a given feedstock by the skilled person.Further, compound C3 and optionally further feedstocks is / are fed into the at least one gasifier. Preferably, the optional further feedstock is selected from the group comprising or consisting of biomass, refuse-derived fuel (RDF), pyrolysis oils made from plastic waste, pyrolysis oils made from end-of-life tires, pyrolysis oils made from biomass, heating oils, vacuum residues, preferably vacuum distillation residues, crude oil residues, heavy crude oils, extra heavy crude oils, tar sand bitumen, visbreaker bottom residues, deasphalter bottom residues, C5 asphalthene fraction, high viscous residues, fuel oils, pyrolysis gasolines, tire pyrolysis oils (TPO), waste oils, used oils, municipal solid waste (MSW), coal, tar oils, natural gas, CO2, pre-sorted automotive shredder residue (ASR), production waste streams from other chemical processes, and mixtures thereof.The selection of gasifier type, gasification process parameters and gasifier size depends on physical and / or chemical properties of the feedstock, the physical and / or chemical properties preferably selected from the group comprising water content, ash content, elemental composition, size, and calorific value. The selection of gasifier type, gasification process parameters and gasifier size also depends on the pre-treatment method applied to the feedstock. An overview of gasifier types is for example provided in James G. Speight, Handbook of Gasification Technology, Scrivener Publishing and Wiley, 2020, chapter 8.4.2, pages 259 to 262.A gas stream GS1 then leaves the at least one gasifier. Said gas stream GS1 comprises CO and H2 (“synthesis gas”) and byproducts of the gasification reaction such as CO2, CH4 and ash. The synthesis gas formed in the at least one gasifier preferably comprises < 15 Vol.-% CO2, more preferably < 10 Vol.-% CO2 and most preferably < 8 Vol.-% CO2.The process comprises a further step in which impurities and other undesired components are removed in a gas treatment unit GTU from the gas stream GS1 formed in the at least one gasifier. Thereby, a gas stream GS2 having a first molar ratio H2 : CO is obtained.Typical impurities in the gas stream GS1 comprise chlorides, sulfur-containing organic compounds such as sulfur dioxide, trace heavy metals (e.g., as respective salts), tars / condensable hydrocarbons and particulate residues. Various chemical and / or physical methods for removal of such impurities from said gas stream GS1 such as filtration, scrubbing, condensation and ab- / adsorption are known and can be chosen and adapted according to the type and respective concentration of the impurities in said gas stream GS1 and the tolerance to such impurities in a further process FP1 .The optional gas treatment unit GTU preferably comprises a unit for removing at least a portion of CO2 from the gas stream GS1 in step (iv) by a method selected from the group comprising or consisting of absorption, adsorption, membrane separation, cryogenic separation, and combinations thereof. Most preferably, said unit is a washing unit such as an “amine wash” or a “methanol” wash which uses one or more amine compounds such as alkanolamines or methanol to absorb CO2. Such units are known in the art and can be adapted for removal of at least a portion of the CO2 from a gaseous stream GS1 by the skilled person.Preferably, the gas stream GS2 is then subjected to a further process FP1 selected from the group comprising methani- zation, methanol synthesis and Fischer-Tropsch synthesis, whereby at least one first product stream PS1 is formed.Methanol is another first product stream PS1 which can be manufactured from the gas stream GS2 by an optional further process FP1 . Methanol can be produced from gas stream GS2 (synthesis gas) by a catalytic gas phase reaction generally at about 5 to 10 MPa and generally at a temperature of about 200 to about 300 °C in e.g., adiabatic reactors or quasi-isothermal reactors. The catalyst is for example a mixture of copper and zinc oxides, supported on alumina. The methanol synthesis and various options thereof suitable to be combined with the production system according to the present invention are known in the art and for example disclosed in Ullmann's Encyclopedia of Industrial Chemistry (2012), Chapter “Methanol”, p. 3 to 12.Methanol can be converted into benzene by a methanol-to-aromatics (MTA) process. Said process is for example described in “Aromatics Production via Methanol-Mediated Transformation Routes”, Teng Li, Tuiana Shoinkhorova, Jorge Gascon, and Javier Ruiz-Martinez, ACS Catal. 2021 , 11 , 7780-7819.The obtained benzene is reacted with hydrogen. Hydrogen from standard sources used in chemical plants can be used. Preferably, the hydrogen or at least a portion thereof is “green hydrogen”, generated for example by electrolysis of water using electricity generated from renewable energy sources (e.g., solar energy, wind energy, tidal energy, and nuclear energy) and / or low-carbon energy sources and / or a methane pyrolysis, preferably a methane pyrolysis using at least partially methane from a renewable source. Methane from a renewable source comprises biomethane. Benzene and hydrogen are contacted with each other in the presence of a first heterogeneous catalyst whereby cyclohexane is formed. Suitable catalysts comprise nickel, platinum, or palladium on a support such as alumina, or a Raney nickel catalyst. The process temperature is about 300 °C or less at a pressure of about 20 to about 30 MPa. Further details are for example disclosed in M. L. Campbell, Ullmann's Encyclopedia of Industrial Chemistry, Vol. 11 , Chapter “Cyclohexane”, pages 44 to 46, 2011 and the references cited therein.Next, the cyclohexane is oxidized in the presence of oxygen and, optionally, a second heterogeneous catalyst, whereby cyclohexanone is formed. Cyclohexanone can be manufactured from cyclohexane for example by liquid-phase oxidation in the presence of air in an uncatalyzed or catalyzed reaction (e.g., cobalt catalyst as second heterogeneous catalyst) at a temperature in the range of about 140 to about 180 °C and a pressure in the range of 0.8 to about 2 MPa. Cyclohexanone can also be manufactured from cyclohexane in the presence of anhydrous (meta-)boric acid. Cyclohexanol is produced by such processes as a side product. Such mixtures comprising cyclohexanone and cyclohexanol are also known as “KA oil” (“ketone-alcohol oil”) and “AnoIon”. Suitable manufacturing processes for cyclohexanonefrom cyclohexane such as the above discussed ones are for example disclosed in M. T. Musser, Ullmann's Encyclopedia of Industrial Chemistry, Vol. 11, Chapter “Cydohexanol and Cyclohexanone”, pages 51 to 54, 2011 and the references cited therein.Caprolactam is then formed from cyclohexanone by converting cyclohexanone to cyclohexanone oxime and then converting the cyclohexanone oxime into caprolactam. Caprolactam is manufactured from cyclohexanone via cyclohexanone oxime as an intermediate. Next, cyclohexanone oxime is subjected to a Beckmann rearrangement by which caprolactam is formed. Cyclohexanone oxime can be for example formed from cyclohexanone in the presence of ammonium hydroxylammonium sulfate or by an ammoximation of cyclohexanone in the presence of ammonia and hydrogen peroxide. Caprolactam can be formed from cyclohexanone oxime by a Beckmann rearrangement. The Beckmann rearrangement reaction can be performed in the presence of a catalyst either in liquid phase or gas phase. For example, fuming sulfuric acid or oleum is used as a catalyst in liquid phase Beckmann rearrangement followed by a neutralization reaction and separation of the caprolactam which is then purified in further process steps. Such manufacturing methods for caprolactam from cyclohexanone are for example disclosed in J. Tinge, M. Groothaert, H. o. h. Veld, J. Ritz, H. Fuchs, H. Kieczka, W. C. Moran, Ullmann's Encyclopedia of Industrial Chemistry, Chapter “Caprolactam”, pages 4 to 16, 2018 and the references cited therein.The publication Prior Art Disclosure; Issue 684; paragraphs

[1000] to

[8005] ; ISSN: 2198-4786; published: February 12, 2024 will be regarded as Reference RF1 , which is incorporated herein by reference in its entirety. Preferably, the product PRF1 is a product as described in Reference RF1; paragraphs

[1000] to

[8005] , Preferably, the method described herein is further a method for the production of a product, preferably product PRF1 .The converting step to obtain the product PRF1 preferably comprises one or more step(s) as described below and can be performed by conventional methods well known to a person skilled in the art. The converting step preferably comprises one or more step(s) selected from: recycling, preferably depolymerizing, gasifying, pyrolyzing, and / or steam cracking; and / or purifying, preferably crystallizing, (solvent) extracting, distilling, evaporating, hydrotreating, absorbing, adsorbing and / or subjecting to ion exchanger; and / or assembling, preferably foaming, synthesizing, chemical conversion, chemically transforming, polymerizing and / or compounding; and / or forming, preferably foaming, extruding and / or molding; and / or finishing, preferably coating and / or smoothing.In addition, the one or more step(s) are described in detail in Reference RF1 ; paragraphs

[1000] to

[8005] ,The term “building block”, as used herein, comprises compounds, which are in a gaseous or liquid state under standard conditions of 0°C and 0.1 MPa. Building blocks are typically used in chemical industry to form secondary products, which provide a higher structural complexity and / or higher molecular weight than the building block on which the secondary product is based. The building block is preferably selected from the group consisting of hydrogen, carbon monoxide, carbon dioxide, ethylene oxide, ethylene glycols, syngas comprising a mixture of hydrogen and carbon monoxide, alkanes, alkenes, alkynes and aromatic compounds. The alkanes, alkenes, alkynes and aromatic compounds comprise in particular 1 to 12 carbon atoms, respectively.The term “monomer”, as used herein, comprises molecules, which can react with each other to form polymer chains by polymerization. The monomer is preferably selected from the group consisting of (meth)acrylic acid, salts of (meth)acrylic acid; in particular sodium, potassium and zinc salts; (meth)acrolein and (meth)acrylates. (Meth)acrylates comprising 1 to 22 carbon atoms are preferred, in particular comprising 1 to 8 carbon atoms. The terms (meth)acrylic acid, (meth)acrolein or (meth)acrylate relate to acrylic acid, acrolein or acrylate and also to methacrylic acid, methacrolein or methacrylate, where applicable. Further, the monomer can be selected from hexamethylenediamine (HMD) and adipic acid.The building block can further be an intermediate compound. The term “intermediate compound”, as used herein, comprises organic reagents, which are applied for formation of compounds with higher molecular complexity. The intermediate compound can be selected for example from the group consisting of phosgene, polyisocyanates and propylene oxide. The polyisocyanates are in particular aromatic di- and polyisocyanates, preferably toluene diisocyanate (TDI) and / or diphenylmethane diisocyanate (MDI).The building block and the monomer and typical converting step(s) to obtain the building block or monomer are described in more detail in paragraphs

[1000] to

[1012] of Reference RF1.The term “polymer A”, as used herein, comprises thermoplastic, e.g., polyamide or thermoplastic polyurethane, thermoset, e.g., polyurethane, elastomer, e.g., polybutadiene, or a copolymer or a mixture thereof and is defined in more detail in paragraphs

[2001] to

[2007] of Reference RF1.The term “polymer composition A”, as used herein, comprises all compositions comprising a polymer as described above and one or more additive(s), e.g. reinforcement, colorant, modifier and / orflame retardant, and is defined in more detail in paragraph

[2008] of Reference RF1.The term “polymer product A”, as used herein, comprises any product comprising the polymer A and / or polymer composition A as described above and is defined in more detail in paragraphs

[2009] and

[2010] of Reference RF1 .The step(s) to obtain the polymer, preferably polymer A, polymer composition, preferably polymer composition A or polymer product, preferably polymer product A is / are described in more detail in paragraph

[2011] of Reference RF1.The term “industrial use polymer'1, as used herein, comprises rheology, polycarboxylate, alkoxylated polyalkylenamine, alkoxylated polyalkylenimine, polyether-based, dye inhibition and soil release cleaning polymers defined in more detail in paragraphs

[3035] to

[3044] of Reference RF1. The term “industrial use surfactant”, as used herein, comprises nonionic, anionic and amphoteric industrial use surfactants defined in more detail in paragraphs

[3008] to

[3034] of Reference RF1. The term “industrial use descaling compound”, as used herein, comprises non-phosphate based builders (NPB) and phosphonates (CoP) described in more detail in paragraphs

[3001] to

[3005] of Reference RF1. The term “industrial use biocide”, as used herein, refers to a chemical compound that kills microorganisms or inhibits their growth or reproduction defined in more detail in paragraphs

[3006] to

[3007] of Reference RF1. The term “industrial use solvent”, as used herein, comprises alkyl amides, alkyl lactamides, alkyl esters, lactate esters, alkyl diester, cyclic alkyl diester, cyclic carbonates, aromatic aldehydes and aromatic esters defined in more detail in paragraphs

[3045] to

[3055] of Reference RF1 . The term “industrial use dispersant”, as used herein, comprises anionic and non-ionic industrial use dispersants defined in more detail in paragraphs

[3056] to

[3058] of Reference RF1. The term “compositionand / or formulation thereof” with reference to the industrial use polymers, industrial use surfactants, descaling compounds and / or industrial use biocides refers to industrial use compositions and / or institutional use products and / or fabric and home care products and / or personal care products defined in more detail in paragraph

[3059] of Reference RF1 . The converting step(s) to obtain the industrial use polymer, industrial use surfactant, descaling compound and / or industrial use biocide are defined in more detail in paragraph

[3060] of Reference RF1. The converting steps to obtain the industrial use composition or formulation of the industrial use polymer, industrial use surfactant, descaling compound and / or industrial use biocide are defined in more detail in paragraph

[3061] of Reference RF1.The term “agrochemical composition”, as used herein, typically relates to a composition comprising an agrochemically active ingredient and at least one agrochemical formulation auxiliary. Examples of agrochemical compositions, active ingredients and auxiliaries are described in more detail in Reference RF1 , paragraph

[4001] ,The agrochemical composition may take the form of any customary formulation. The agrochemical compositions are prepared in a known manner, e.g. described by Mollet and Grubemann, Formulation technology, Wiley VCH, Weinheim, 2001 ; or Knowles, New developments in crop protection product formulation, Agrow Reports DS243, T&F Informa, London, 2005. The converting step(s) to obtain the agrochemically active ingredients and auxiliaries may be conducted in analogy to the production step(s) of their analogues that are based on petrochemicals or other precursors that are not gained by recycling processes. In addition, conversion to compounds mentioned in sections “Polymer” and “Cosmetic surfactant, emollient, wax, cosmetic polymer, UV filter, further cosmetic ingredient or compositions or formulations thereof” may be performed as described in these sections as well as the respective paragraphs in Reference RF1.The term active pharmaceutical ingredients and / or intermediates thereof, as used herein, comprises substances that provide pharmacological activity or other direct effect in the diagnosis, cure, mitigation, treatment, or prevention of disease, or to affect the structure or any function of the body. Intermediates thereof are isolated products that are generated during a multi-step route of synthesis of an active pharmaceutical ingredient. The term pharmaceutical excipients, as used herein, comprises compounds or compound mixtures used in compositions for various pharmaceutical applications, which are not substantially pharmaceutically active on itself. Active pharmaceutical ingredients and / or intermediates thereof and pharmaceutical excipients are defined in more detail in paragraph

[5001] of Reference RF1 . The converting step(s) to obtain the active pharmaceutical ingredients and / or intermediates thereof and pharmaceutical excipients may comprise one or more synthesis steps and can be performed by conventional synthesis and techniques well known to a person skilled in the art.The terms animal feed additives, human food additives, dietary supplements, as used herein, comprises Vitamins, Pro- Vitamins and active metabolites thereof including intermediates and precursors, especially Vitamin A, B, E, D, K and esters thereof, like acetate, propionate, palmitate esters or alcohols thereof like retinol or salts thereof and any combinations thereof; Tetraterpenes, especially isoprenoids like carotenoids and xanthophylls including their intermediates and precursors as well as mixtures and derivates thereof, especially beta carotene, Canthaxanthin, Citranaxanthin, Astaxanthin, Zeaxanthin, Lutein, Lycopene, Apo-carotenoids, and any combinations thereof; organic acids, especially formic acid, propionic acid and salts thereof, such as sodium, calcium or ammonium salts, and any combinations thereof, such as but not limited to mixtures of formic acid and sodium formiate, propionic acid and ammoniumpropionate, formic acid and propionic acid, formic acid and sodium formiate and propionic acid, propionic acid and sodium propionate and formic acid and sodium formiate; glycerides of carboxylic acids and short and medium chain fatty acids, conjugated linoleic acids, such as omega-6 fatty acid (C18:2) methyl ester and 1 ,2-propandiol and beverage stabilizers, such as polyvinylpyrrolidone-polymer or polyvinylimidazole / polyvinylpyrrolidone-copolymer. Animal feed additives, human food additives and dietary supplements are defined in more detail in paragraph

[5002] of Reference RF1.The converting step(s) to obtain the animal feed additives, human food additives, dietary supplements may comprise one or more synthesis steps and can be performed by conventional synthesis and techniques well known to a person skilled in the art.The terms aroma chemical and aroma composition as used herein, comprise a volatile organic substance with a molecular weight between 70-250 g / mol comprising a functional group with a carbon skeleton of C5-C16 carbon atoms comprising linear, branched, cyclic, for example with a ring size of C5-C18, bicyclic or tricyclic aliphatic chains and but not necessarily one or more unsaturated structural elements like double bonds, triple bonds, aromatics or heteroaromatics and preferably the one or more additional functional groups are selected from alcohol, ether, ester, ketone, aldehyde, acetal, carboxylic acid, nitrile, thiol, amine. In one aspect, the aroma chemical is a terpene-based aroma chemical, for example selected from monoterpenes and monoterpenoids, sesquiterpenes and sesquiterpenoids, diterpenes, triterpenes or tetraterpenes. Aroma chemicals can be combined with further aroma chemicals to give an aroma composition. Aroma chemicals and aroma compositions are defined in more detail in paragraph

[5003] of Reference RF1.The converting step(s) to obtain the aroma chemical and aroma composition may comprise one or more synthesis steps and can be performed by conventional synthesis and techniques well known to a person skilled in the art.The term “aqueous polymer dispersion”, as used herein, comprises aqueous composition(s) comprising dispersed polymer(s) and is defined in more detail in the section

[6001] entitled “aqueous polymer dispersion” of Reference RF1 . The dispersed polymer(s) may be selected from acrylic emulsion polymer(s), styrene acrylic emulsion polymer(s), styrene butadiene dispersion(s), aqueous dispersion(s) comprising composite particles, acrylate alkyd hybrid dispersions), polyurethane(s) (including UV-curable polyurethanes) and polyurethane - poly(meth)acrylate hybrid poly- mer(s). The term “emulsion polymer”, as used herein, comprises polymer(s) made by free-radical emulsion polymerization. Aqueous polyurethane dispersion(s) are defined in more detail in the section

[6002] entitled “Polyurethane dispersions” of Reference RF1. UV-curable polyurethane(s) is / are defined in more detail in the section

[6017] of Reference RF1. Polyurethane - poly(meth)acrylate hybrid polymer(s) is / are defined in more detail in the section

[6016] of Reference RF1.The term “polymeric dispersant”, as used herein, comprises preferably polymer(s) comprising polyether side chain, in particular polycarboxylate ether polymer(s) and polycondensation product(s) defined in more detail in paragraph

[6020] entitled “Polymeric dispersant” of Reference RF1.The converting (polymerization) step(s) to obtain the aqueous polymer dispersion(s) comprising emulsion polymer(s) is / are defined in more detail in the section

[6003] entitled “Emulsion polymerization” of Reference RF1.The converting (polymerization) step(s) to obtain the aqueous polyurethane dispersion(s) is / are defined in more detail in the section

[6014] entitled “Process for the preparation of aqueous polyurethane dispersions” and section

[6017] entitled “Aqueous UV-curable polyurethane dispersions, their preparation and use and compositions containing them” of Reference RF1.Composition(s) and uses of aqueous polymer dispersion(s) and of polymeric dispersant(s) are defined in more detail in the following sections of Reference RF1 : section

[6004] entitled “Uses of aqueous polymer dispersions”, section

[6005] entitled “Binders for architectural and construction coatings” section

[6006] entitled “Binders for paper coating” section

[6007] entitled “Binders for fiber bonding” section

[6008] entitled “Adhesive polymers and adhesive compositions” section

[6015] entitled “Aqueous polyurethane dispersions suitable for use in coating compositions” section

[6016] entitled “Aqueous polyurethane - poly(meth)acrylate hybride polymer dispersions suitable for use in coating compositions” section

[6017] entitled “Aqueous UV-curable polyurethane dispersions, their preparation and use and compositions containing them” section

[6018] entitled “Inorganic binder compositions comprising polymeric dispersants and their use”

[6019] 100% curable coating compositionsUV-crosslinkable poly(meth)acrylate(s) and its / their uses are defined in more detail in section

[6009] entitled “UV- crosslinkable poly(meth)acrylates for use in UV-curable solvent-free hotmelt adhesives and their use for making pressure-sensitive self-adhesive articles” of Reference RF1.Polyisocyanate(s), composition(s) comprising them and their uses are defined in more detail in section

[6010] entitled “Polyisocyanates” of Reference RF1.Hyperbranched polyester polyol(s) and its / their uses are defined in more detail in section

[6011] entitled “Organic solvent based hyperbranched polyester polyols suitable for use in coating compositions” of Reference RF1. The converting step(s) to obtain the hyperbranched polyester polyols is / are defined in more detail in the section

[6012] entitled “Preparation of organic solvent based hyperbranched polyester polyols” of Reference RF1. Coating composition(s) comprising hyperbranched polyester polyol(s), polyisocyanate(s) and additive(s) and substrate(s) coated therewith are defined in more detail in section

[6013] entitled “Organic solvent based two component coating compositions comprising hyperbranched polyester polyols and polyisocyanates” of Reference RF1.Unsaturated polyester polyol(s), solvent-based coating composition(s) comprising said unsaturated polyester polyol(s) and substrate(s) for coating with said coating composition(s) are defined in more detail in section

[6018] entitled “Organic solvent based coating composition comprising unsaturated polyester polyols” of Reference RF1.100% curable coating composition(s) is / are defined in more detail in section

[6019] of Reference RF1.Polymeric dispersant(s) for inorganic binder compositions is / are defined in more detail in section

[6020] of Reference RF1 . The inorganic binder composition(s) comprising the polymeric dispersants and their use are defined in more detail in section

[6021] of Reference RF1. The converting step(s) to obtain the polymeric dispersant(s) are defined in moredetail in section

[6020] of Reference RF1. The term “inorganic binder composition” comprising the polymeric dispersants), as used herein, comprises preferably in particular hydraulically setting compositions and compositions comprising calcium sulfate and is defined in more detail in section

[6021] of Reference RF1 entitled “Inorganic binder compositions comprising the polymeric dispersant and their use”. Specific building material formulation(s) comprising polymeric dispersant(s) or building product(s) produced by a building material formulation comprising a polymeric dispersant are disclosed in more detail in section

[6021] of Reference RF1.The term “cosmetic surfactant”, as used herein, comprises non-ionic, anionic, cationic and amphoteric surfactants and is defined in more detail in paragraph

[7002] of Reference RF1. The term “emollient”, as used herein, refers to a chemical compound used for protecting, moisturizing, and / or lubricating the skin and is defined in more detail in paragraph

[7003] of Reference RF1 . The term “wax”, as used herein, comprises pearlizers and opacifiers and is defined in more detail in paragraph

[7004] of Reference RF1 . The term “cosmetic polymer'1, as used herein, comprises any polymer that can be used as an ingredient in a cosmetic formulation and is defined in more detail in paragraph

[7005] of Reference RF1 . The term “UV filter”, as used herein, refers to a chemical compound that blocks or absorbs ultraviolet light and is defined in more detail in paragraph

[7006] of Reference RF1. The term “further cosmetic ingredient”, as used herein, comprises any ingredient suitable for making a cosmetic formulation. Several sources disclose cosmetically acceptable ingredients. E. g. the database Cosing on the internet pages of the European Commission discloses cosmetic ingredients and the International Cosmetic Ingredient Dictionary and Handbook, edited by the Personal Care Products Council (PCPC), discloses cosmetic ingredients. The term “composition and / or formulation thereof” with reference to the cosmetic surfactant, emollient, wax, cosmetic polymer, UV filter and / or further cosmetic ingredient refers to personal care and / or cosmetic compositions or formulations defined in more detail in paragraph

[7007] of Reference RF1. The converting step(s) to obtain the cosmetic surfactant, emollient, wax, cosmetic polymer, UV filter or further cosmetic ingredient is / are defined in more detail in paragraph

[7008] of Reference RF1.The terms “polymer B”, “polymer composition B”, “coating composition”, “other functional composition”, “foil”, “molded body”, “coating” and “coated substrate” are well known to the person skilled in the art and are defined in more detail from paragraph

[8000] to

[8005] of Reference RF1.A person skilled in the art knows that in every step, the glass fibers may change, e.g., the length of the glass fibers change, if the glass fibers will be grinded. Thus, the glass fibers GF1 , GFT and GF1” may change in one or more properties in every step.In summary, embodiments and preferred embodiments are the following embodiments. The scope of protection is defined by the claims. The combination of two or more embodiments, e.g. 3, 4 or 8 embodiments is further preferred. Definitions and general statements herein preferably also apply for the following embodiments and preferred embodiments. In addition, if not stated otherwise, definitions and general statements herein referring the polymer composition also apply for the product, method and use, and vice versa. Preferably, the steps described in the embodiments below are conducted, if present in the claims, in its logical order and / or in the order of the embodiments below and / or as depicted in the attached Figures.Method comprising the steps, preferably in this order: v’) providing one or more of the following compound(s): a compound C1 comprising, preferably consisting of, glass fibers GF1, and / or a compound C2 comprising, preferably consisting of, a monomer A, preferably and monomer B; and / or oligomers thereof, and / or a compound C3 comprising, preferably consisting of, a residue R, wherein the compound C1 and / or compound C2 and / or compound C3 is / are obtained by or obtainable by a method comprising the steps, preferably in this order: i) providing a waste stream WO comprising a polymer PO, preferably and glass fibers GFO, wherein the polymer PO is obtainable by polymerizing a mixture comprising a monomer A, preferably and monomer B; and / or oligomers thereof, ii) preferably sorting the waste stream WO to obtain a waste stream W1 ,Hi) bringing the waste stream WO, preferably the waste stream W1 , in contact with a composition CO to obtain a mixture M1, iv) heating the mixture M1 to obtain a mixture M2, and v) separating the mixture M2 to obtain one or more of the following compound(s): the compound C1 comprising the glass fibers GF1 , and / or the compound C2 comprising the monomer A, preferably and monomer B; and / or oligomers thereof, and / or the compound C3 comprising the residue R. Method, preferably according to any one of the preceding embodiments, comprising the steps, preferably in this order: i) providing a waste stream WO comprising a polymer PO, preferably and (the) glass fibers GFO, wherein the polymer PO is obtainable by polymerizing a mixture comprising a monomer A, preferably and monomer B; and / or oligomers thereof, ii) preferably sorting the waste stream WO to obtain a waste stream W1 ,Hi) bringing the waste stream WO, preferably the waste stream W1, in contact with a composition CO to obtain a mixture M1 , iv) heating the mixture M1 to obtain a mixture M2, and v) separating the mixture M2 to obtain one or more of the following compound(s): a compound C1 comprising (the) glass fibers GF1 , and / or a compound C2 comprising a monomer A, preferably and monomer B; and / or oligomers thereof, and / or a compound C3 comprising a residue R. Method according to any one of the preceding embodiments, comprising the steps, preferably in this order: vi) purifying and / or converting one or more of the compound C 1 , compound C2 and compound C3 to obtain one or more of the following compound(s): a compound C 1 ’ comprising, preferably consisting of, glass fibers GF1’,a compound C2’ comprising, preferably consisting of, a / the monomer A, preferably and monomer B; and / or oligomers thereof, and / or a compound C3’ comprising, preferably consisting of, a monomer X and / or one or more addi- tive(s) AD1, preferably wherein the step vi) comprises, preferably is, the step:C 1 -vi) purifying and / or converting the compound 01 to obtain a compound C1 ’ comprising, preferably consisting of, glass fibers GF1’, and / or, preferably and, preferably wherein the step vi) comprises, preferably is, the step:C2-vi) purifying and / or converting the compound C2 to obtain a compound C2’ comprising, preferably consisting of, a / the monomer A, preferably and a / the monomer B; and / or oligomers thereof, and / or, preferably and, preferably wherein the step vi) comprises, preferably is, the step:C3-vi) purifying and / or converting the compound C3 to obtain a compound C3’ comprising, preferably consisting of, the monomer X and / or the one or more additive(s) AD1, and vii) preferably mixing and / or polymerizing a mixture M3, comprising, preferably consisting of, compound C1 , C1’, C1”, C2, C2’, C3 or C3’; or a mixture thereof, to obtain a polymer P1 and / or a polymer composition PC1 comprising a / the polymer P1, and viii) preferably converting the polymer P1 and / or the polymer composition PC1 to obtain a product PRF1.4. Method according to any one of the preceding embodiments, wherein the step v) comprises, preferably is, the step: v) separating the mixture M2 to obtain a / the compound 01 comprising (the) glass fibers GF1.5. Method according to any one of the preceding embodiments, wherein the step v) comprises, preferably is, the step: v) separating the mixture M2 to obtain a / the compound 02 comprising a / the monomer A, preferably and monomer B; and / or oligomers thereof.6. Method according to any one of the preceding embodiments, wherein the step v) comprises, preferably is, the step: v) separating the mixture M2 to obtain a / the compound 03 comprising a / the residue R.7. Method according to any one of the preceding embodiments, wherein, in the step v, (at least) compound 01 is obtained; and / or wherein, in the step v’, (at least) compound 01 is provided.8. Method according to any one of the preceding embodiments, wherein, in the step v, (at least) compound 02 is obtained; and / or wherein, in the step v’, (at least) compound 02 is provided.9. Method according to any one of the preceding embodiments, wherein, in the step v, (at least) compound 03 is obtained; and / or wherein, in the step v’, (at least) compound 03 is provided.10. Method according to any one of the preceding embodiments, wherein the step v) comprises, preferably is, the step: v) separating the mixture M2 to obtain: a / the compound 01 comprising (the) glass fibers GF1 , and a / the compound C2 comprising a / the monomer A, preferably and monomer B; and / or oligomers thereof, and preferably a / the compound C3 comprising a / the residue R; and / or the step v’) comprises, preferably is, the step: v’) providing: a / the compound 01 comprising (the) glass fibers GF1 , and a / the compound 02 comprising a / the monomer A, preferably and monomer B; and / or oligomers thereof, and preferably a / the compound 03 comprising a / the residue R.11. Method according to any one of the preceding embodiments, wherein the step v) comprises, preferably is, the step: v) separating the mixture M2 to obtain: a / the compound 01 comprising (the) glass fibers GF1 , and a / the compound 03 comprising a / the residue R, and preferably a / the compound 02 comprising a / the monomer A, preferably and monomer B; and / or oligomers thereof; and / or the step v’) comprises, preferably is, the step: v’) providing: a / the compound 01 comprising (the) glass fibers GF1 , and a / the compound 03 comprising a / the residue R, and preferably a / the compound 02 comprising a / the monomer A, preferably and monomer B; and / or oligomers thereof.12. Method according to any one of the preceding embodiments, wherein the step v) comprises, preferably is, the step: v) separating a / the mixture M2 to obtain: a / the compound 02 comprising a / the monomer A, preferably and monomer B; and / or oligomers thereof, and a / the compound 03 comprising a / the residue R, and preferably a / the compound 01 comprising (the) glass fibers GF1 ; and / or the step v’) comprises, preferably is, the step: v’) providing: a / the compound 02 comprising a / the monomer A, preferably and monomer B; and / or oligomers thereof, and a / the compound 03 comprising a / the residue R, and preferably a / the compound 01 comprising (the) glass fibers GF1 .13. Method according to any one of the preceding embodiments, wherein the step v) comprises, preferably is, the step: v) separating the mixture M2 to obtain: a / the compound 01 comprising (the) glass fibers GF1 , and preferably a / the compound C2 comprising a / the monomer A, preferably and monomer B; and / or oligomers thereof, and / or preferably a / the compound C3 comprising a / the residue R; and / or the step v’) comprises, preferably is, the step: v’) providing: a / the compound 01 comprising (the) glass fibers GF1 , and preferably a / the compound 02 comprising a / the monomer A, preferably and monomer B; and / or oligomers thereof, and / or preferably a / the compound 03 comprising a / the residue R.14. Method according to any one of the preceding embodiments, wherein, in the heating step iv), the mixture M1 is stirred with a stirrer with a torque of 0.1 Nm or more, preferably 0.5 Nm or more, more preferably 1.0 Nm or more, more preferably 2.0 Nm or more, more preferably 3.0 Nm or more, more preferably 4.0 Nm or more, more preferably 5.0 Nm or more, more preferably 6.0 Nm or more, more preferably 7.0 Nm or more, more preferably 8.0 Nm or more, more preferably 9.0 Nm or more, more preferably 10.0 Nm or more, more preferably 15.0 Nm or more, more preferably 20.0 Nm or more, more preferably 50.0 Nm or more.15. Method according to any one of the preceding embodiments, wherein, in the heating step iv), the mixture M1 is stirred with a stirrer with a torque of 1000 Nm or less, preferably 750 Nm or less, more preferably 500 Nm or less, more preferably 250 Nm or less, more preferably 150 Nm or less, more preferably 100 Nm or less, more preferably 50 Nm or less, more preferably 25 Nm or less, more preferably 20 Nm or less, more preferably 15 Nm or less, more preferably 12 Nm or less, more preferably 10.0 Nm or less, more preferably 9.0 Nm or less, more preferably 8.0 Nm or less, more preferably 7.0 Nm or less, more preferably 6.0 Nm or less, more preferably 5.0 Nm or less, more preferably 4.0 Nm or less, more preferably 3.0 Nm or less, more preferably 2.0 Nm or less, more preferably 1 .0 Nm or less.16. Method according to any one of the preceding embodiments, wherein, in the heating step iv), the mixture M1 is stirred with a stirrer with revolutions per minute of 10 rpm or more, preferably 30 rpm or more, more preferably 60 rpm or more, more preferably 120 rpm or more, more preferably 200 rpm or more, more preferably 300 rpm or more, more preferably 400 rpm or more, more preferably 500 rpm or more, more preferably 600 rpm or more.17. Method according to any one of the preceding embodiments, wherein, in the heating step iv), the mixture M1 is stirred with a stirrer with revolutions per minute of 1000 rpm or less, preferably 900 rpm or less, more preferably 800 rpm or less, more preferably 700 rpm or less, more preferably 600 rpm or less, more preferably 500 rpm or less, more preferably 400 rpm or less, more preferably 300 rpm or less, more preferably 200 rpm or less, more preferably 100 rpm or less, more preferably 80 rpm or less, more preferably 60 rpm or less, more preferably 40 rpm or less, more preferably 20 rpm or less.Method according to any one of the preceding embodiments, wherein, in the heating step iv), the mixture M1 is stirred with a stirrer with a power of 1 W or more, preferably 10 W or more, more preferably 25 W or more, more preferably 50 W or more, more preferably 100 W or more, more preferably 250 W or more, more preferably 500 W or more, more preferably 750 W or more, more preferably 1000 W or more, more preferably 2000 W or more, more preferably 4000 W or more, more preferably 6000 W or more. Method according to any one of the preceding embodiments, wherein, in the heating step iv), the mixture M1 is stirred with a stirrer with a power of 10000 W or less, preferably 7500 W or less, more preferably 5000 W or less, more preferably 2500 W or less, more preferably 1000 W or less, more preferably 800 W or less, more preferably 600 W or less, more preferably 400 W or less, more preferably 200 W or less, more preferably 100 W or less, more preferably 50 W or less, more preferably 25 W or less. Method according to any one of the preceding embodiments, wherein, in the heating step iv), the mixture M1 is heated to a temperature TO of 150 °C or more, preferably 160 °C or more, more preferably 170 °C or more, more preferably 180 °C or more, more preferably 190 °C or more, more preferably 200 °C or more, more preferably 210 °C or more, more preferably 220 °C or more, more preferably 230 °C or more, more preferably 240 °C or more, more preferably 250 °C or more, more preferably 260 °C or more, more preferably 270 °C or more, more preferably 280 °C or more, more preferably 290 °C or more, more preferably 300 °C or more, more preferably 310 °C or more, more preferably 320 °C or more, more preferably 330 °C or more. Method according to any one of the preceding embodiments, wherein, in the heating step iv), the mixture M1 is heated to a temperature TO of 330 °C or less, preferably 320 °C or less, preferably 310 °C or less, preferably 300 °C or less, preferably 290 °C or less, preferably 280 °C or less, preferably 270 °C or less, preferably 260 °C or less, preferably 250 °C or less, preferably 240 °C or less, preferably 230 °C or less, preferably 220 °C or less, preferably 210 °C or less, preferably 200 °C or less, preferably 190 °C or less, preferably 180 °C or less, preferably 170 °C or less, preferably 160 °C or less, preferably 150 °C or less. Method according to any one of the preceding embodiments, wherein, in the heating step iv), the mixture M1 is heated to temperature TO for a time tO of 5 s or more, preferably 30 s or more, more preferably 1 min or more, more preferably 3 min or more, more preferably 5 min or more, more preferably 8 min or more, more preferably 10 min or more, more preferably 25 min or more, more preferably 50 min or more, more preferably 75 min or more, more preferably 100 min or more, more preferably 150 min or more, more preferably 200 min or more, more preferably 250 min or more, more preferably 300 min or more, more preferably 400 min or more, more preferably 500 min or more, more preferably 600 min or more. Method according to any one of the preceding embodiments, wherein, in the heating step iv), the mixture M1 is heated to temperature TO for a time tO of 1000 min or less, preferably 500 min or less, more preferably 250 min or less, more preferably 100 min or less, more preferably 30 min or less, more preferably 20 min or less, more preferably 10 min or less, more preferably 5 min or less, more preferably 1 min or less.Method according to any one of the preceding embodiments, wherein, in the heating step iv), a pressure pO, preferably during heating to temperature TO and / or for a time tO, is set to 10 bar or more, preferably 20 bar or more, more preferably 30 bar or more, more preferably 40 bar or more, more preferably 50 bar or more, more preferably 60 bar or more, more preferably 70 bar or more, more preferably 80 bar or more, more preferably 90 bar or more, more preferably 100 bar or more, more preferably 110 bar or more, more preferably 120 bar or more, more preferably 130 bar or more. Method according to any one of the preceding embodiments, wherein, in the heating step iv), a pressure pO, preferably during heating to temperature TO and / or for a time tO, is set to 400 bar or less, preferably 300 bar or less, more preferably 200 bar or less, more preferably 150 bar or less, more preferably 120 bar or less, more preferably 110 bar or less, more preferably 100 bar or less, more preferably 80 bar or less, more preferably 60 bar or less, more preferably 40 bar or less. Method according to any one of the preceding embodiments, comprising the step:C 1 -vi) purifying and / or converting compound C1 to obtain a compound CT comprising, preferably consisting of, the glass fibers GFT. Method according to any one of the preceding embodiments, wherein the step C 1 -vi) comprises, preferably is, the step:C1-vi’) heating the compound C1 to obtain the compound C1” comprising, preferably consisting of, (the) glass fibers GF1”. Method according to any one of the preceding embodiments, wherein, in the heating step C1-vi’), the compound C1 is heated to a temperature T 1 of 150°C or more, preferably 175°C or more, more preferably 200°C or more, more preferably 225°C or more, more preferably 250°C or more, more preferably 275°C or more, more preferably 300°C or more, more preferably 325°C or more, more preferably 350°C or more, more preferably 375°C or more, more preferably 400°C or more, more preferably 500°C or more. Method according to any one of the preceding embodiments, wherein, in the heating step C1-vi’), the compound C1 is heated to a temperature T 1 of 1000°C or less, preferably 750°C or less, more preferably 500°C or less, more preferably 475°C or less, more preferably 450°C or less, more preferably 425°C or less, more preferably 400°C or less, more preferably 375°C or less, more preferably 350°C or less, more preferably 325°C or less, more preferably 300°C or less. Method according to any one of the preceding embodiments, wherein, in the heating step C1-vi’), the compound C1 is heated to temperature T1 for a time t1 of 5 s or more, preferably 30 s or more, more preferably 1 min or more, more preferably 3 min or more, more preferably 5 min or more, more preferably 8 min or more, more preferably 10 min or more, more preferably 25 min or more, more preferably 50 min or more, more preferably 75 min or more, more preferably 100 min or more, more preferably 150 min or more, more preferably 200 min or more, more preferably 250 min or more, more preferably 300 min or more, more preferably 400 min or more, more preferably 500 min or more, more preferably 600 min or more.31. Method according to any one of the preceding embodiments, wherein, in the heating step C1-vi’), the compound 01 is heated to temperature T1 for a time t1 of 1000 min or less, preferably 500 min or less, more preferably 250 min or less, more preferably 100 min or less, more preferably 30 min or less, more preferably 20 min or less, more preferably 10 min or less, more preferably 5 min or less, more preferably 1 min or less.32. Method according to any one of the preceding embodiments, wherein, in the heating step heating step C 1 -vi’, a pressure p1, preferably during heating to temperature T1 and / or for time t1 , is set to 1 bar or more, preferably 10 bar or more, more preferably 20 bar or more, more preferably 30 bar or more, more preferably 40 bar or more, more preferably 50 bar or more, more preferably 60 bar or more, more preferably 70 bar or more, more preferably 80 bar or more, more preferably 90 bar or more, more preferably 100 bar or more, more preferably 110 bar or more, more preferably 120 bar or more, more preferably 130 bar or more.33. Method according to any one of the preceding embodiments, wherein, in the heating step heating step C 1 -vi’, a pressure p1, preferably during heating to temperature T1 and / or for time t1, is set to 400 bar or less, preferably 300 bar or less, more preferably 200 bar or less, more preferably 150 bar or less, more preferably 120 bar or less, more preferably 110 bar or less, more preferably 100 bar or less, more preferably 80 bar or less, more preferably 60 bar or less, more preferably 40 bar or less.34. Method according to any one of the preceding embodiments, wherein the step C 1 -vi) comprises, preferably is, the step:C1-vi”) sizing the compound C1 and / or the compound C1” to obtain a compound C1’ comprising the glass fibers GF1’.35. Method according to any one of the preceding embodiments, wherein the sizing comprises, preferably consists of, unmodified starch, modified starch, ethylene vinyl acetate, polyester, epoxy resin, polyurethane, siloxane or silane; or mixtures thereof, preferably siloxane and / or silane.36. Method according to any one of the preceding embodiments, wherein the sizing comprises, preferably consists of, an antistatic agent, binding agent, lubricant, or adhesion promoter; or mixtures thereof, preferably an antistatic agent, lubricant, or adhesion promoter; or mixtures thereof, more preferably an adhesion promoter.37. Method according to any one of the preceding embodiments, wherein the sizing does not comprise a binding agent.38. Method according to any one of the preceding embodiments, wherein the step C 1 -vi) comprises, preferably is, the step: adjusting the length of the glass fibers GF1 and / or the glass fibers GF1 ’ and / or the glass fibers GF1”, preferably wherein the adjusting step comprises one or more step(s) selected from comminuting, cutting, sieving, grinding, chopping, and remelting, preferably comminuting, cutting, sieving, grinding and chopping.39. Method according to any one of the preceding embodiments, wherein the compound 01 ’ exhibits a ratio [weight- % / weight-%] of the sizing to the glass fibers GF1’ of 10.00 or less, preferably 5.00 or less, more preferably 4.00 or less, more preferably 3.00 or less, more preferably 2.00 or less, more preferably 1 .00 or less, more preferably 0.50.40. Method according to any one of the preceding embodiments, wherein the compound C1 ’ exhibits a ratio [weight- % / weight-%] of the sizing to the glass fibers GF1’ of 0.01 or more, preferably 0.1 or more, more preferably 0.2 or more, more preferably 0.3 or more, more preferably 0.4 or more, more preferably 0.5 or more, more preferably 1.0 or more.41. Method according to any one of the preceding embodiments, wherein the average length of the glass fibers GF1, GF1’, and / or GF1” is / are 20 pm or more, preferably 50 pm or more, more preferably 100 pm or more, more preferably 200 pm or more, more preferably 300 pm or more, more preferably 400 pm or more, more preferably 500 pm or more, more preferably 1000 pm or more, more preferably 2000 pm or more, more preferably 3000 pm or more, more preferably 4000 pm or more.42. Method according to any one of the preceding embodiments, wherein the average length of the glass fibers GF1, GF1 ’, and / or GF1” is / are 10 mm or less, preferably 8 mm or less, more preferably 8 mm or less, more preferably 6 mm or less, more preferably 4 mm or less, more preferably 2 mm or less, more preferably 1000 pm or less, more preferably 7500 pm or less, more preferably 500 pm or less, more preferably 400 pm or less, more preferably 300 pm or less, more preferably 200 pm or less, more preferably 100 pm or less, more preferably 50 pm or less.43. Method according to any one of the preceding embodiments, comprising the step: vii) mixing and / or polymerizing a mixture M3, comprising, preferably consisting of, compound C1, compound C1’, or compound C1”; or a mixture thereof, preferably compound 01’, to obtain a polymer composition PC1.44. Method according to any one of the preceding embodiments, wherein, in the step v, (at least) a / the compound C2 is obtained; and / or wherein, in the step v’, (at least) a / the compound C2 is provided.45. Method according to any one of the preceding embodiments, wherein the step vi) comprises, preferably is, the step:02-vi) purifying and / or converting the compound C2 to obtain a compound 02’ comprising, preferably consisting of, a / the monomer A, preferably and a / the monomer B; and / or oligomers thereof.46. Method according to any one of the preceding embodiments, wherein the step vi) and / or 02-vi) comprise(s), preferably is / are, the step:C2-vi’) diluting, centrifuging, distilling, filtrating, extracting, performing an adsorptive cleaning, and / or hydrotreating the compound C2 to obtain compound C2’ comprising, preferably consisting of, the monomer A, preferably and monomer B; and / or oligomers thereof.47. Method according to any one of the preceding embodiments, wherein the step vi) comprises, preferably is, the step: vi) purifying and / or converting the compound C3 to obtain a compound C3’ comprising the monomer X and / or one or more additive(s) AD1.48. Method according to any one of the preceding embodiments, wherein the step vi) comprises, preferably is, the step:C3-vi) purifying and / or converting the compound C3 to obtain a compound C3’ comprising, preferably consisting of, the monomer X and / or the one or more additive(s) AD1.49. Method according to any one of the preceding embodiments, wherein the step C3-vi) comprises, preferably is, the step:C3-vi’) recycling the compound C3 to obtain a compound C3’ comprising a monomer X and / or one or more additive(s) AD1.50. Method according to any one of the preceding embodiments, wherein the step C3-vi) and / or the step C3-vi’) comprise(s), preferably is / are, the steps:C3-vi”) pyrolyzing and / or gasifying the compound C3 to obtain a mixture MX, andC3-vi”’) converting the mixture MX to a obtain compound C3’ comprising a monomer X and / or one or more additive(s) AD1.51. Method according to any one of the preceding embodiments, comprising the step: vii) polymerizing a mixture M3 comprising compound C3’ to obtain a polymer composition PC1 .52. Method according to any one of the preceding embodiments, comprising the step: ii) sorting the waste stream WO to obtain a waste stream W1.53. Method according to any one of the preceding embodiments, wherein, in the sorting step, the content of a / the polymer PO and / or (the) glass fibers GFO is / are enhanced, preferably by using infrared IR techniques and / or sorting by density and / or sorting by color and / or flotation and / or ballistic separation, preferably by using infrared IR, preferably near infrared NIR and / or mid infrared MIR, more preferably mid infrared MIR, techniques.54. Method according to any one of the preceding embodiments, comprising the step: vii) mixing and / or polymerizing a mixture M3, comprising, preferably consisting of, compound C 1 , C 1 ’, C1”, C2, C2’, C3 or C3’; or a mixture thereof, to obtain a polymer P1 and / or a polymer composition PC1 comprising a / the polymer P1, preferably wherein the step vii) comprises, preferably is, the step:vii) mixing a mixture M3, comprising, preferably consisting of, compound C1 , C1’, C1 ”, C2, C2’, C3 or C3’; or a mixture thereof, to obtain a polymer P1 and / or a polymer composition PC1 comprising a / the polymer P1, preferably a polymer composition PC1 comprising a / the polymer P1.55. Method according to any one of the preceding embodiments, wherein the step vii) comprises, preferably is, the step: vii) polymerizing a mixture M3, comprising, preferably consisting of, compound C1 , C1 ’, C1 ”, C2, C2’, C3 or C3’; or a mixture thereof, to obtain a polymer P1 and / or a polymer composition PC1 comprising a / the polymer P1.56. Method, preferably according to any one of the preceding embodiments, comprising the step: viii) converting the polymer P1 and / or the polymer composition PC1 , preferably obtainable by or obtained by a method according to any one of the preceding embodiments, to obtain a product PRF1 .57. Method according to any one of the preceding embodiments, wherein the method is a method for recycling of a waste stream and / or the production of (a) recycled glass fibers, monomer(s), polymer(s), polymer compositions) and / or a polymer product(s).58. Method according to any one of the preceding embodiments, wherein the waste stream WO is automotive shredder residue, preferably polymer enriched automotive shredder residue, and / or mixed plastic waste and / or postconsumer waste and / or scrap tires and / or household waste and / or electronic waste, preferably automotive shredder residue, more preferably polymer enriched automotive shredder residue.59. Method according to any one of the preceding embodiments, wherein the waste stream WO is derived from a product WP and the product PRF1 and the product WP are the same; and / or wherein the waste stream WO is derived from a type of product WTP and the kind or type of the product PRF1 and the kind or type of the product WTP are the same, preferably wherein the type of products WTP and PRF1 is a part of an automotive or a part of a construction or a part of a housing or a packaging or a part of a packaging or a textile, more preferably a part of an automotive; and / or wherein the method is a method for the production of a product, preferably product PRF1, comprising closed loop recycling content, and / or wherein the product PRF1 comprises closed loop recycling content, preferably derived from the waste stream WO, preferably waste stream W1.60. Method according to any one of the preceding embodiments, wherein the waste stream W0 and / or the waste stream W1 comprise(s) 30 weight-% or more, preferably 40 weight-% or more, more preferably 50 weight-% or more, more preferably 60 weight-% or more, more preferably 70 weight-% or more, more preferably 80 weight- % or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more, more preferably 98 weight-% or more, glass fibers GF0 and / or, preferably and, polymer P0.61. Method according to any one of the preceding embodiments, wherein the waste stream WO and / or the waste stream W1 comprise(s) 100 weight-% or less, preferably 99 weight-% or less, more preferably 95 weight-% or less, more preferably 90 weight-% or less, more preferably 80 weight-% or less, more preferably 70 weight-% or less, more preferably 60 weight-% or less, more preferably 50 weight-% or less, glass fibers GF0 and / or, preferably and, polymer P0.62. Method according to any one of the preceding embodiments, wherein, in the waste stream W0 and / or the waste stream W1, the average glass fiber length of the glass fibers GF0 is 0.01 mm or more, preferably 0.05 mm or more, more preferably 0.1 mm or more, more preferably 0.2 mm or more, more preferably 0.3 mm or more, more preferably 0.4 mm or more, more preferably 0.5 mm or more, more preferably 0.6 mm or more, more preferably 0.8 mm or more, more preferably 1 .0 mm or more, more preferably 5 mm or more, more preferably 10 mm or more, more preferably 20 mm or more, more preferably 40 mm or more.63. Method according to any one of the preceding embodiments, wherein, in the waste stream W0 and / or the waste stream W1 , the average glass fiber length of the glass fibers GF0 is 100 mm or less, preferably 10 mm or less, more preferably 9 mm or less, more preferably 8 mm or less, more preferably 7 mm or less, more preferably 6 mm or less, more preferably 5 mm or less, more preferably 4 mm or less, more preferably 3 mm or less, more preferably 2 mm or less, more preferably 1 mm or less.64. Method according to any one of the preceding embodiments, wherein the mixture M1 comprises a ratio (weight- % / weight-%) of waste stream W0, preferably waste stream W1 , to composition CO of 0.01 or more, preferably 0.05 or more, more preferably 0.10 or more, more preferably 0.20 or more, more preferably 0.50 or more, more preferably 0.75 or more, more preferably 1 .00 or more.65. Method according to any one of the preceding embodiments, wherein the mixture M1 comprises a ratio (weight- % / weight-%) of waste stream W0, preferably waste stream W1, to composition CO of 10 or less, preferably 5 or less, more preferably 3 or less, more preferably 1 or less, more preferably 0.5 or less, more preferably 0.1 or less.66. Method according to any one of the preceding embodiments, wherein the mixture M2 comprises the glass fibers GF1, monomer A, preferably and monomer B; and / or oligomers thereof, and residue R, preferably wherein a content of the glass fibers GF1 , monomer A, preferably and monomer B; and / or oligomers thereof, is 10 weight- % or more, preferably 20 weight-% or more, more preferably 30 weight-% or more, more preferably 40 weight- % or more, more preferably 50 weight-% or more, more preferably 60 weight-% or more, more preferably 70 weight-% or more, more preferably 80 weight-% or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more, more preferably 98 weight-% or more.67. Method according to any one of the preceding embodiments, wherein the mixture M3 comprises compound C 1 , C1’, or C1”, or a mixture thereof, preferably C1’.68. Method according to any one of the preceding embodiments, wherein the mixture M3 comprises compound C2 or 02’, or a mixture thereof, preferably C2’.69. Method according to any one of the preceding embodiments, wherein the mixture M3 comprises compound C3 or C3’, or a mixture thereof, preferably C3’.70. Method according to any one of the preceding embodiments, wherein the mixture M3 comprises polymer P1.71. Method according to any one of the preceding embodiments, wherein the mixture M3 comprises one or more additive(s) AD1.72. Method according to any one of the preceding embodiments, wherein the mixture M3 comprises monomer A, preferably and monomer B; and / or oligomers thereof.73. Method according to any one of the preceding embodiments, wherein the mixture M3 comprises monomer X.74. Method according to any one of the preceding embodiments, wherein the mixture M3 comprises the glass fibers GF1, the glass fibers GF1’ and / or the glass fibers GF1”, more preferably the glass fibers GF1’ and / or the glass fibers GF1”, more preferably the glass fibers GF1’.75. Method according to any one of the preceding embodiments, wherein the mixture M3 comprises, preferably consists of, in weight-%:40 to 100, preferably 50 to 90, more preferably 60 to 80 monomer A, preferably and monomer B; and / or oligomers thereof,0 to 30, preferably 1 to 20, more preferably 3 to 15 monomer X,0 to 60, preferably 1 to 50, more preferably 15 to 40 glass fibers GF1, glass fibers GF1’ and / or glass fibers GF1 ”, more preferably glass fibers GF1 ’ and / or glass fibers GF1”, more preferably glass fibers GF1’; and0 to 30, preferably 1 to 20, more preferably 3 to 15 one or more additive(s) AD1 .76. Method according to any one of the preceding embodiments, wherein the mixture M3 comprises polymer P1 , preferably comprises, more preferably consists of, in weight-%:40 to 100, preferably 50 to 90, more preferably 60 to 80 polymer P1,0 to 60, preferably 1 to 50, more preferably 15 to 40 glass fibers GF1, glass fibers GF1’ and / or glass fibers GF1 ”, more preferably glass fibers GF1 ’ and / or glass fibers GF1”, more preferably glass fibers GF1’; and0 to 30, preferably 1 to 20, more preferably 3 to 15 one or more additive(s) AD1 .77. Method according to any one of the preceding embodiments, wherein the one or more additive(s) AD1 is / are selected from fiber(s), antioxidating agent(s), stabilizer(s), lubricant(s), mineral(s), colorant(s), pigment(s), dye(s), soot, talc, carbon black, bio additive(s), plasticizer(s), flame retardant(s), and mixtures thereof.78. Method according to any one of the preceding embodiments, wherein the one or more additive(s) AD1 comprises glass fibers vGF, preferably wherein the vGF fibers are bundled glass fiber(s), virgin glass fiber(s) and / or non-recyded glass fiber(s), preferably wherein a ratio (weight-% / weight-%) of a content of the glass fiber(s) vGF to a content of the glass fibers GF1 , the glass fibers GF1’ and / or the glass fibers GF1 ”, more preferably the glass fibers GF1 ’ and / or the glass fibers GF1 ”, more preferably the glass fibers GF1’, in the mixture M3 and / or the polymer compound PC1 and / or the polymer product PRF1 is 0.01 to 100, preferably 0.1 to 10, more preferably 0.5 to 5, more preferably about 1.79. Method according to any one of the preceding embodiments, wherein the one or more additive(s) AD1 are at least partially obtained and / or obtainable by a method according to any one of the preceding embodiments.80. Method according to any one of the preceding embodiments, wherein, in the mixture M3 and / or the polymer composition PC1 and / or the product PRF1, a ratio (weight-% / weight-%) of a content of the one or more addi- tive(s) AD1 obtained by a method according to any one of the preceding embodiments to a content of the entire one or more additive(s) AD1 is 0.001 or more, preferably 0.005 or more, more preferably 0.010 or more, more preferably 0.050 or more, more preferably 0.100 or more, more preferably 0.500 or more, more preferably 0.750 or more, more preferably 0.850 or more, more preferably 0.950 or more, more preferably 1 or more, more preferably 10 or more, more preferably 50 or more.81. Method according to any one of the preceding embodiments, wherein, in the mixture M3 and / or the polymer composition PC1 and / or the product PRF1 , a ratio (weight-% / weight-%) of a content of the entire one or more additive(s) AD1 to a content of the one or more additive(s) AD1 obtained by a method according to any one of the preceding embodiments is 0.001 or more, preferably 0.005 or more, more preferably 0.010 or more, more preferably 0.050 or more, more preferably 0.100 or more, more preferably 0.500 or more, more preferably 0.750 or more, more preferably 0.850 or more, more preferably 0.950 or more, more preferably 1 or more, more preferably 10 or more, more preferably 50 or more.82. Method according to any one of the preceding embodiments, wherein the composition CO is a depolymerizing composition.83. Method according to any one of the preceding embodiments, wherein the composition CO at least partially, preferably completely, depolymerizes the polymer P0.84. Method according to any one of the preceding embodiments, wherein the composition CO comprises, preferably consists of, water, preferably 0.1 weight-% or more and 100 weight-% or less, more preferably 1 weight-% or more and 95 weight-% or less, more preferably 5 weight-% or more and 80 weight-% or less, more preferably10 weight-% or more and 70 weight-% or less, more preferably 15 weight-% or more and 50 weight-% or less, more preferably 20 weight-% or more and 40 weight-% or less, water. Method according to any one of the preceding embodiments, wherein the composition CO comprises a solvent, preferably wherein the solvent is an alcohol, more preferably methanol, more preferably 1 weight-% or more and 99 weight-% or less, more preferably 20 weight-% or more and 95 weight-% or less, more preferably 40 weight-% or more and 90 weight-% or less, more preferably 60 weight-% or more and 85 weight-% or less, more preferably 70 weight-% or more and 80 weight-% or less, solvent, preferably wherein the solvent is an alcohol, more preferably methanol. Method according to any one of the preceding embodiments, wherein the composition CO comprises a base, preferably an alkali hydroxide, more preferably NaOH, more preferably 0.1 weight-% or more and 25 weight-% or less, more preferably 0.5 weight-% or more and 20 weight-% or less, more preferably 1.0 weight-% or more and 15 weight-% or less, more preferably 3 weight-% or more and 10 weight-% or less, more preferably 5 weight-% or more and 7 weight-% or less, base, preferably alkali hydroxide, more preferably NaOH. Method according to any one of the preceding embodiments, wherein the composition CO comprises an acid, preferably HCI, more preferably 0.1 weight-% or more and 25 weight-% or less, more preferably 0.5 weight-% or more and 20 weight-% or less, more preferably 1.0 weight-% or more and 15 weight-% or less, more preferably 3 weight-% or more and 10 weight-% or less, more preferably 5 weight-% or more and 7 weight-% or less, acid, preferably HCI. Method according to any one of the preceding embodiments, wherein the composition CO does not comprise any acid and base and / or wherein the composition CO consists of water and / or a solvent, preferably wherein the solvent is an alcohol, more preferably methanol, more preferably the composition CO consists of water. Method according to any one of the preceding embodiments, wherein a content of the glass fibers GF1 in the compound C1 is 50 weight-% or more, preferably 60 weight-% or more, more preferably 70 weight-% or more, more preferably 80 weight-% or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more, more preferably 98 weight-% or more, more preferably wherein the compound C1 consists of the glass fibers GF1. Method according to any one of the preceding embodiments, wherein a content of the glass fibers GF1 ’ in the compound C 1 ’ is 50 weight-% or more, preferably 60 weight-% or more, more preferably 70 weight-% or more, more preferably 80 weight-% or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more, more preferably 98 weight-% or more, more preferably wherein the compound C 1 ’ consists of the glass fibers GFT. Method according to any one of the preceding embodiments, wherein a content of the glass fibers GF1” in the compound CT is 50 weight-% or more, preferably 60 weight-% or more, more preferably 70 weight-% or more, more preferably 80 weight-% or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more, more preferably 98 weight-% or more.92. Method according to any one of the preceding embodiments, wherein a content of the glass fibers GF1’ in weight-% in the compound C 1 ’ is higher than a content of the of the glass fibers GF1 in weight-% in the compound 01.93. Method according to any one of the preceding embodiments, wherein a content of the monomer A, preferably and monomer B; and / or oligomers thereof, in weight-%, in the compound C2’ is higher than a content of the of the monomer A, preferably and monomer B; and / or oligomers thereof, in weight-%, in the compound C2.94. Method according to any one of the preceding embodiments, wherein a content of the monomer X and / or one or more additive(s) AD1, in weight-%, in the compound C3’ is higher than a content of the of the monomer X and / or one or more additive(s) AD1, in weight-%, in the compound C3.95. Method according to any one of the preceding embodiments, wherein a content of the monomer A, preferably and monomer B; and / or oligomers thereof, in the compound C2 and / or compound C2’ is / are 50 weight-% or more, preferably 60 weight-% or more, more preferably 70 weight-% or more, more preferably 80 weight-% or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more, more preferably 98 weight- % or more.96. Method according to any one of the preceding embodiments, wherein the compound C2 and / or C2’ comprise(s), preferably consist(s) of, a / the monomer A, preferably and monomer B.97. Method according to any one of the preceding embodiments, wherein the compound C2 and / or C2’ comprise(s), preferably consist(s) of, oligomers of monomer A, preferably and monomer B.98. Method according to any one of the preceding embodiments, wherein a content of the residue R in the compound C3 is 50 weight-% or more, preferably 60 weight-% or more, more preferably 70 weight-% or more, more preferably 80 weight-% or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more, more preferably 98 weight-% or more, more preferably wherein the compound C3 consists of residue R.99. Method according to any one of the preceding embodiments, wherein a content of glass fibers GF1 , monomer A, preferably and monomer B; and oligomers thereof, in the residue R is 10 weight-% or less, preferably 5 weight-% or less, more preferably 2 weight-% or less, more preferably 1 weight-% or less, more preferably 0.5 weight-% or less, more preferably 0.1 weight-% or less, more preferably 0.01 weight-% or less, more preferably wherein the residue R does not contain glass fibers GF1 , monomer A, preferably and monomer B; and oligomers thereof.100. Method according to any one of the preceding embodiments, wherein a content of the elements C, H, N, O, and S, preferably C and H, preferably measured via elemental analysis, in the residue R, preferably the compound C3, is 50 weight-% or more, preferably 60 weight-% or more, more preferably 70 weight-% or more, morepreferably 80 weight-% or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more, more preferably 98 weight-% or more.101. Method according to any one of the preceding embodiments, wherein a content of the monomer A, preferably and monomer B; and oligomers thereof, and / or, preferably and, the glass fibers GF1 in the residue R, preferably the compound C3, is 50 weight-% or less, preferably 40 weight-% or less, more preferably 30 weight-% or less, more preferably 20 weight-% or less, more preferably 15 weight-% or less, more preferably 10 weight-% or less, more preferably 8 weight-% or less, more preferably 5 weight-% or less, more preferably 3 weight-% or less, more preferably 1 weight-% or less, more preferably 0.5 weight-% or less, more preferably 0.1 weight-% or less.102. Method according to any one of the preceding embodiments, wherein a content of water in the residue R, preferably the compound C3, is 50 weight-% or less, preferably 40 weight-% or less, more preferably 30 weight- % or less, more preferably 20 weight-% or less, more preferably 15 weight-% or less, more preferably Wweight- % or less, more preferably 8 weight-% or less, more preferably 5 weight-% or less, more preferably 3 weight-% or less, more preferably 1 weight-% or less, more preferably 0.5 weight-% or less, more preferably 0.2 weight- % or less, more preferably 0.1 weight-% or less, more preferably 0.05 weight-% or less, more preferably 0.01 weight-% or less.103. Method according to any one of the preceding embodiments, wherein the compound C3’ comprises the monomer X, preferably wherein a content of the monomer X in the compound C3’ is 50 weight-% or more, preferably 60 weight-% or more, more preferably 70 weight-% or more, more preferably 80 weight-% or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more, more preferably 98 weight-% or more, more preferably wherein the compound C3’ consists of monomer X.104. Method according to any one of the preceding embodiments, wherein the compound C3’ comprises the one or more additive(s) AD1 , preferably wherein a content of the one or more additive(s) AD1 in the compound C3’ is 50 weight-% or more, preferably 60 weight-% or more, more preferably 70 weight-% or more, more preferably 80 weight-% or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more, more preferably 98 weight-% or more, more preferably wherein the compound C3’ consists of one or more additive(s) AD1.105. Method according to any one of the preceding embodiments, wherein the polymer composition PC1 and / or the product PRF1 comprises, preferably consists of, in weight-%:40 to 100, preferably 50 to 90, more preferably 60 to 80 polymer P1 ,0 to 60, preferably 1 to 50, more preferably 15 to 40 compound C1 , compound C1’ and / or compound C1”, more preferably compound C1’ and / or compound C1”, more preferably compound CT; and 0 to 30, preferably 1 to 20, more preferably 3 to 15 one or more additive(s) AD1.106. Method according to any one of the preceding embodiments, wherein the polymer P0 and the polymer P1 are the same.Method according to any one of the preceding embodiments, wherein the polymer P0 and / or the polymer P1 is / are polyamide (PA), polyisocyanate polyaddition product; preferably polyurethane (PU), thermoplastic polyurethane (TPU), polyurea or polyisocyanurate (PIR); melamine-formaldehyde resins (MF), low-density polyethylene (LDPE), high-density polyethylene (HDPE), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyvinyl acetate (PVA), polystyrene (PS), poly acrylonitrile butadiene styrene (ABS), poly styrene acrylonitrile (SAN), poly acrylate styrene acrylonitrile (ASA), polytetrafluoroethylene (PTFE), poly(methyl acrylate) (PMA), poly(methyl methacrylate) (PM MA), polybutadiene (BR, PBD), poly(cis-1,4-isoprene), poly(trans-1 ,4- isoprene), polyoxymethylene (POM), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), aromatic-aliphatic polyester; preferably polybutylene adipate coterephthalate (PBAT), or polybutylene sebacinate coterephthalate (PBSeT); aliphatic polyester; preferably polybutylene succinate (PBS); polybutylene adipate cosuccinate (PBSA), polyester (PES), polyether sulfone (PESU), polyhydroxyalkanoate (PHA), poly-3-hydroxy- butyrate (P3HB), poly-4-hydroxybutyrate (P4HB), polyhydroxyvalerate (PHV), polyhydroxyhexanoate (PHH), polyhydroxyoctanoate (PHO), polylactic acid (PLA), polysulfone (PSU), polyphenylene sulfone (PPSU), polycarbonate (PC), polyether ether ketone (PEEK), poly(p-phenylene oxide) (PPO), poly(p-phenylene ether) (PPE); or copolymers or mixtures thereof. Method according to any one of the preceding embodiments, wherein the polymer P0 and / or the polymer P1 is / are PA 4, PA 5, PA 6, PA 7, PA 8, PA 9, PA 10, PA 11, PA 12, PA 2.2, PA 4.6, PA 5.6, PA 5.10, PA 5.12, PA 6.6, PA 6 / 6.6, PA 6.6 / 6, PA 6.6 / 6 / 6.10, PA 6.9, PA 6.10, PA 6.12, PA 6.13, PA 6 / 6.36, PA 9.6, PA 9.9, PA 9.10, PA 9.12, PA 10.12, PA 12.12, PA 12 / MACM.I (MACM = 3,3'-dimethyl-4,4'-diamino dicyclohexyl methane); I = isophthalic acid), PA 12 / MACM.T (T = terephthalic acid), PA 13.13, PA 6.T, PA 9.T, PA 8.T, PA 10.T, PA 12.T, PA 6.I, PA 8.I, PA 9.I, PA 10.1, PA 12.1, PA 6.T / 6, PA 6.T / 10, PA 6.T / 12, PA 6.T / 6.I, PA6.I / 6.T, PA 6.T / 8.T, PA 6.T / 9.T, PA 6.T / 10.T, PA 6.T / 12.T, PA 12.T / 6.T, PA 6.T / D.T (D = 2-methylpentamehtylen-1 ,5-diamine), PA 6-3.T (6-3 = trimethylhexamethylendiamine), PA 6.T / 6.I / 6, PA 6.T / 6.I / 12, PA 6.T / 6.1 / 6.10, PA 6.T / 6.I / 6.12, PA 6.T / 6.6, PA 6.6 / 6.T, PA 6.T / 6.10, PA 6.T / 6.12, PA 10.T / 6, PA 10.T / 11 , PA 10.T / 12, PA 8.T / 6.T, PA 8.T / 6.6, PA 8.T / 8.I, PA 8.T / 8.6, PA 8.T / 6.I, PA 10.T / 6.T, PA 10.T / 6.6, PA 10.T / 10.I, PA 10.T / 10.I / 6.T, PA 10.T / 6.I, PA4.T / 4.I / 4.6, PA 4.T / 4.I / 6.6, PA 5.T / 5.I, PA 5.T / 5.I / 5.6, PA 5.T / 5.I / 6.6, PA 6.T / 6.I / 6.6, PA MXDA.6 (MXDA = m- xylylenediamine), PA IPDA.I (IPDA = isophorone diamine), PA IPDA.T, PA MACM. I, PA MACM.T, PA MACM.10, PA MACM.36, PA PACM.10 (PACM = 4,4'-diaminodicyclohexylmethane), PA PACM.12, PA PACM.36, PA PACM.I, PA PACM.T, PA MXDA.I, PA MXDA.T, PA 6.T / IPDA.T, PA 6.T / MACM.T, PA 6.T / PACM.T, PA 6.T / MXDA.T, PA 6.T / 6.I / 8.T / 8.I, PA 6.T / 6.I / 10.T / 10.I, PA 6.T / 6.I / IPDA.T / IPDA.I, PA 6.T / 6.I / MXDA.T / MXDA.I, PA 6.T / 6.I / MACM.T / MACM.I, PA 6.T / 6.I / PACM.T / PACM.I, PA 6.T / 10.T / IPDA.T, PA 6.T / 12.T / IPDA.T, PA 6.T / 10.T / PACM.T, PA 6.T / 12.T / PACM.T, PA 10.T / IPDA.T, PA 12.T / IPDA.T, PA PDA.T (PDA = phenylendiamine); or copolymers or mixtures thereof; preferably PA 6, PA 66; or copolymers or mixtures thereof; more preferably PA 6. Method according to any one of the preceding embodiments, wherein the polymer P0 and / or the polymer P1 is / are PA 66.110. Method according to any one of the preceding embodiments, wherein the polymer P1 and / or the polymer PO is / are obtainable or obtained by polymerizing a mixture comprising the monomer A, preferably and monomer B; and / or oligomers thereof.111. Method according to any one of the preceding embodiments, wherein the monomer A and / or B and / or X is / are selected from diols; preferably butandiol; polyols, aldehydes; preferably formaldehyde; amides; preferably caprolactam; sulfones; preferably 4,4'-dichlorodiphenyl sulfone; diamines; preferably hexamethylenediamine (HMD) and nonanediamine; diacids; preferably terephthalic acid and adipic acid; diisocyanates; preferably toluene diisocyanate (TDI) and diphenylmethane diisocyanate (MDI); preferably caprolactam, hexamethylenediamine (HMD) and adipic acid, more preferably caprolactam and hexamethylenediamine (HMD), more preferably is caprolactam.112. Method according to any one of the preceding embodiments, wherein the monomer A is hexamethylenediamine (HMD).113. Method according to any one of the preceding embodiments, wherein the monomer A is adipic acid.114. Method according to any one of the preceding embodiments, wherein the monomer B is hexamethylenediamine (HMD).115. Method according to any one of the preceding embodiments, wherein the monomer B is adipic acid.116. Method according to any one of the preceding embodiments, wherein the product PRF1 is selected from: i) building block or monomer; or ii) polymer, preferably polymer A, polymer composition, preferably polymer composition A, or polymer product, preferably polymer product A; orHi) industrial use polymer, industrial use surfactant, descaling compound, industrial use biocide, industrial use solvent, industrial use dispersant, composition thereof or formulation thereof; or iv) agrochemical composition, agrochemical formulation auxiliary or agrochemically active ingredient; or v) active pharmaceutical ingredient or intermediate thereof, pharmaceutical excipient, animal feed additive, human food additive, dietary supplements, aroma chemical or aroma composition; or vi) aqueous polymer dispersion, preferably polyurethane or polyurethane - poly(meth)acrylate hybrid polymer dispersion, emulsion, binder for paper and fiber coatings, UV-curable acrylic polymer for hot melts and coatings polyisocyanates, hyperbranched polyester polyol, polymeric dispersant for inorganic binder compositions, unsaturated polyester polyol or 100% curable composition; or vii) cosmetic surfactant, emollient, wax, cosmetic polymer, UV filter, further cosmetic ingredient or composition or formulation thereof; or viii) polymer B, polymer composition B, coating composition, other functional composition, foil, molded body, coating or coated substrate.Method according to any one of the preceding embodiments, wherein the product PRF1 is or is a part of: a part of an automotive; preferably cylinder head cover, engine cover, housing for charge air cooler, charge air cooler flap, intake pipe, intake manifold, connector, gear wheel, fan wheel, cooling water box, housing, housing part for heat exchanger, coolant cooler, charge air cooler, thermostat, water pump, radiator, fastening part, part of battery system for electromobility, dashboard, steering column switch, seat, headrest, center console, transmission component, door module, A, B, C or D pillar cover, spoiler, door handle, exterior mirror, windscreen wiper, windscreen wiper protection housing, decorative grill, cover strip, roof rail, window frame, sunroof frame, antenna panel, headlight and taillight, engine cover, cylinder head cover, intake manifold, airbag, cushion, or coating; a cloth; preferably shirt, trousers, pullover, boot, shoe, shoe sole, tight or jacket; an electrical part; preferably electrical or electronic passive or active component, circuit board, printed circuit board, housing component, foil, line, switch, plug, socket, distributor, relay, resistor, capacitor, inductor, bobbin, lamp, diode, LED, transistor, connector, regulator, integrated circuit (IC), processor, controller, memory, sensor, microswitch, microbutton, semiconductor, reflector housing for light-emitting diodes (LED), fastener for electrical or electronic component, spacer, bolt, strip, slide-in guide, screw, nut, film hinge, snap hook (snap-in), or spring tongue; a consumer, agricultural product or pharmaceutical product; preferably tennis string, climbing rope, bristle, brush, artificial grass, 3D printing filament, grass trimmer, zipper, hook and loop fastener, paper machine clothing, extrusion coating, fishing line, fishing net, offshore line and rope, vial, syringe, ampoule, bottle, sliding element, spindle nut, chain conveyor, plain bearing, roller, wheel, gear, roller, ring gear, screw and spring dampers, hose, pipeline, cable sheathing, socket, switch, cable tie, fan wheel, carpet, box or bottle for cosmetics, mattress, cushion, insulation, detergent, dishwasher tabs or powder, shampoo, body wash, shower gel, soap, fertilizer, fungicide, or pesticide; a packaging for the food industry; preferably mono- or multi-layer blown film, cast film (mono- or multilayer), biaxially stretched film, or laminating film; or a part of a construction; preferably a rotor blade, insulating material, frame, housing, wall, coating, or separating wall; preferably wherein the product PRF1 is or is a part of: a part of an automotive; preferably cylinder head cover, engine cover, housing for charge air cooler, charge air cooler flap, intake pipe, intake manifold, connector, gear wheel, fan wheel, cooling water box, housing, housing part for heat exchanger, coolant cooler, charge air cooler, thermostat, water pump, radiator, fastening part, part of battery system for electromobility, dashboard, steering column switch, seat, headrest, center console, transmission component, door module, A, B, C or D pillar cover, spoiler, door handle, exterior mirror, windscreen wiper, windscreen wiper protection housing, decorative grill, cover strip, roof rail, window frame, sunroof frame, antenna panel, headlight and taillight, engine cover, cylinder head cover, intake manifold, airbag, cushion, or coating. Method according to any one of the preceding embodiments, wherein a content of the waste stream WO in the product PRF1 is 1 weight-% or more, preferably 2 weight-% or more, more preferably 5 weight-% or more, more preferably 15 weight-% or more, more preferably 30 weight-% or more, more preferably 40 weight-% or more, more preferably 60 weight-% or more, more preferably 80 weight-% or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more; and / or wherein a content of the waste stream W0 in the product PRF1 is 100 weight-% or less, preferably 95 weight- % or less, more preferably 90 weight-% or less, more preferably 50 weight-% or less, more preferably 25 weight- % or less, more preferably 10 weight-% or less; and preferably wherein the content is determined based on identity preservation and / or segregation and / or mass balance and / or book and claim chain of custody models, preferably based on mass balance, preferably the International Sustainability and Carbon Certification (ISCC) standard.119. Method according to any one of the preceding embodiments, wherein the monomer X and the monomer A are the same.120. Method according to any one of the preceding embodiments, wherein the monomer X and the monomer B are the same.121. Use of a mixture M3, comprising compound C1 , C1 ’, C1 ”, C2, C2’, C3 or C3’; or a mixture thereof, in a mixing and / or polymerizing step to obtain a polymer P1 and / or a polymer composition PC1 comprising a / the polymer P1, wherein compound C1 , C1’, C1 ”, C2, C2’, C3 or C3’; or a mixture thereof, is / are obtained by or obtainable by a method according to any one of the preceding embodiments.122. A monomer, preferably monomer A, B, or X, glass fibers, preferably glass fibers GF1, GF1’ or GF”, a polymer, preferably polymer P1 , a polymer composition, preferably polymer composition PC1, or product, preferably product PRF1 , obtained by or obtainable by a method according to any one of the preceding embodiments.ExamplesExample 140 g (0.1238 mol) of a mixture comprising PA 66 and glass fibers was weighed into the reaction vessel. Subsequently, 77 g (4.277mol) of water were added to the reaction vessel. After filling the reaction vessel, it was clamped into the autoclave head and sealed tightly with clamping jaws and the reaction autoclave air was removed in three successive purging cycles using nitrogen. The reaction was initiated by raising the target temperature to 250 °C, using a temperature ramp of 45 min. After reaching the target temperature of 250 °C, the reaction vessel was pressurized with nitrogen to a total pressure of 100 bar. The reaction mixture was heated for 4 hours while stirring at 1000 revolutions per minute (rpm). Then, the reaction was cooled down and rapidly cold-released by opening a valve through a 10 piM frit via a riser tube into a second autoclave.The temperature of the flash autoclave raised to approx. 60 °C. After cold decompression, the reaction autoclave was cooled down to 50 °C and the pressure was released via the exhaust gas line to allow the reaction autoclave to beopened. After cooling down, the flash autoclave was depressurized with a valve to open it. 21 .2 g of compound comprising glass fibers and 93.0 g of a compound comprising oligomers derived from PA 66 was obtained.The compound comprising oligomers can be further separated to obtain a compound comprising a residue which can be dried and then used as feedstock in a gasification. The glass fibers can either be used directly or after workup, e.g. heating and sizing, in a PA66 polymer compound.Example 2In a suitable 250 ml autoclave, 60 g PA66 composite material was added (containing 42 g of PA66 and 18 g of glass fibers). 115 g of water was added and the mixture was heated to 250°C while stirring. A pressure of 37 bar was achieved. The reaction mixture was kept at this temperature for 4 hours and stirred. The solution of PA 66 oligomers was then separated from the glass fibers by a frit by forcing the solution through the frit at 250°C into a second autoclave heated to 250°C. The glass fibers were obtained as a residue after further drying in a vacuum as a fluffy residue (18 g). The filtrate was slowly cooled to room temperature within about 4 hours. The yield was 150 g of a white solid aqueous suspension. The white residue was filtered off with a pressure filter nozzle at room temperature. Therefore, 3 bar of nitrogen was applied during filtration. The yield was 67 g of a white solid (55% solids content), as well as 68 g of a mother liquor that was evaporated on the rotary evaporator. 5 g of a white solid were obtained from the mother liquor.The white solid obtained from the mother liquor can be dried and then used as feedstock in a pyrolysis and / or gasification. Any pyrolyzing and / or gasifying technique well known to a person skilled in the art can be used.Example 3Glass fibers (GF) obtained from a polyamide compound by depolymerization as described herein, separated via filtration, were dried and re-compounded into a polyamide compound (28% GF content) using a twin-screw extruder with side feeder. Standardized test specimens were made by injection molding and tested according to ISO527-2:20: 12 at 23 °C in dry condition. An average tensile modulus 8569 MPa was measured.FiguresFigures 1 and 2 depict a schema of the steps i) to viii). Preferably the steps are conducted in this order.Many modifications and other embodiments of the invention set forth herein will come to mind to the one skilled in the art to which the invention pertains having the benefit of the teachings presented in the foregoing description. Therefore, it is to be understood that the invention is not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

52Claims1 . Method comprising the steps: v’) providing a compound C3 comprising a residue R, wherein the compound C3 is obtained by or obtainable by a method comprising the steps: i) providing a waste stream WO comprising a polymer PO, preferably and glass fibers GFO, wherein the polymer PO is obtainable by polymerizing a mixture comprising a monomer A, preferably and a monomer B, ii) preferably sorting the waste stream WO to obtain a waste stream W1 ,Hi) bringing the waste stream WO, preferably the waste stream W1 , in contact with a composition CO to obtain a mixture M1, iv) heating the mixture M1 to obtain a mixture M2, v) separating the mixture M2 to obtain the compound C3 comprising the residue R,C3-vi) purifying and / or converting the compound C3 to obtain a compound C3’ comprising a monomer X and / or one or more additive(s) AD1, and vii) preferably mixing and / or polymerizing a mixture M3, comprising the compound C3’, preferably and a polymer P1 and / or one or more additive(s) AD1, to obtain a polymer composition PC1 comprising a / the polymer P1 , and viii) preferably converting the polymer composition PC1 to obtain a product PRF1.

2. Method according to claim 1 , wherein the step C3-vi) comprises one or more of the step(s):C3-vi’) recycling the compound C3 to obtain a compound C3’ comprising the monomer X and / or the one or more additive(s) AD13. Method according to claim 1 or 2, wherein the C3-vi) comprises the steps:C3-vi”) pyrolyzing and / or gasifying the compound C3 to obtain a mixture MX, andC3-vi”’) converting the mixture MX to obtain compound C3’ comprising the monomer X and / or the one or more additive(s) AD1.

4. Method according to any one of the preceding claims, wherein step vii) is: vii) mixing and / or polymerizing a mixture M3 a mixture M3, comprising the compound C3’, preferably and a polymer P1 and / or one or more additive(s) AD1, to obtain a polymer composition PC1 comprising a / the polymer P1 , preferably mixing a mixture M3, comprising the compound C3’, to obtain a polymer P1 and / or a polymer composition PC1 comprising a / the polymer P1, preferably a polymer composition PC1 comprising a / the polymer P1.

5. Method according to any one of the preceding claims, comprising the step: vii) polymerizing a mixture M3 to obtain a polymer P1 and / or a polymer composition PC1 comprising a / the polymer P1.

536. Method according to any one of the preceding claims, wherein the mixture M3 comprises, preferably consists of, in weight-%:40 to 100, preferably 50 to 90, more preferably 60 to 80 monomer A, preferably and monomer B,0 to 30, preferably 1 to 20, more preferably 3 to 15 monomer X,0 to 60, preferably 1 to 50, more preferably 15 to 40 glass fibers GF1, glass fibers GFT and / or glass fibers GF1 ”, more preferably glass fibers GF1 ’ and / or glass fibers GF1”, more preferably glass fibers GFT; and0 to 30, preferably 1 to 20, more preferably 3 to 15 one or more additive(s) AD1 .

7. Method, preferably according to any one of the preceding claims, comprising the step: viii) converting the polymer P1 and / or the polymer composition PC1 , preferably obtainable by or obtained by a method according to any one of the preceding embodiments, to obtain a product PRF18. Method according to any one of the preceding claims, wherein the method is a method for recycling of a waste stream and / or the production of (a) recycled glass fibers, monomer(s), polymer(s), polymer composition(s) and / or a polymer product(s).

9. Method according to any one of the preceding claims, wherein the waste stream W0 is automotive shredder residue, preferably polymer enriched automotive shredder residue, and / or mixed plastic waste and / or postconsumer waste and / or scrap tires and / or household waste and / or electronic waste, preferably automotive shredder residue, more preferably polymer enriched automotive shredder residue.

10. Method according to any one of the preceding claims, wherein the monomer X and the monomer A are the same.

11. Method according to any one of the preceding claims, wherein the compound 03’ comprises, preferably consists of, a / the monomer X.

12. Method according to any one of the preceding claims, wherein the compound 03’ comprises, preferably consists of, (the) one or more additive(s) AD1 .

13. Method according to any one of the preceding claims, wherein the composition CO does not comprise any acid and base and / or wherein the composition CO consists of water and / or a solvent, preferably wherein the solvent is an alcohol, more preferably methanol.

14. Use of a mixture M3 comprising compound C3’, preferably and a polymer P1 and / or one or more additive(s), to obtain a polymer composition PC1 comprising a / the polymer P1, wherein compound C3’ is obtained by or obtainable by a method according to any one of the preceding claims.5415. A polymer composition or product obtained by or obtainable by a method according to any one of the claims 1

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