Process for isolation of glass fibers, adipic acid and hexamethylene diamine from pa66

Abstract

The present invention relates to a process for treating a polymeric material (PM) comprising a polyamide (PA66) (PA66) based polymer and at least one filler (F1), the process comprising providing a polymeric material (PM) comprising a polyamide (PA66) based polymer and at least one filler (F1) and a solvent composition (SC) comprising at least one solvent (S1) with a Hansen parameter H in the range of from 10 to 25 MPa0.5, preparing a mixture (M-0) from the polymeric material (PM) and the solvent composition (SC); subjecting mixture (M-0) to conditions for dissolving the polyamide (PA66) based polymer (D1) comprising a temperature T(D1) in the range of from 50 to 280°C and a time t(D1) sufficient to at least partially dissolve the polyamide (PA66) based polymer, preferably for a time of at least 5 minutes, in particular in the range of from 15 to 600 minutes, obtaining a mixture (M-1) comprising the solvent composition (SC), dissolved polyamide (PA66) based polymer, filler (F1), and insoluble residues; and separating the filler (F1) and insoluble residues from mixture (M-1) obtaining mixture (M-2) comprising the filler (F1) and insoluble residues, and mixture (M-3) comprising the solvent composition (SC) and dissolved polyamide (PA66) based polymer. The present invention also relates to the filler obtained in the process as well as a polyamide (PA66) based polymer obtained according to said process.

Description

Process for isolation of glass fibers, adipic acid and hexamethylene diamine from PA66The present invention relates to a process for treating a polymeric material (PM) comprising a polyamide 66 (PA66) based polymer and at least one filler (F1), the process comprising providing a polymeric material (PM) comprising a polyamide (PA66) based polymer and at least one filler (F1) and a solvent composition (SC) comprising at least one solvent (S1) with a Hansen parameter H 10 to 25 MPa0 5, preparing a mixture (M-0) from the polymeric material (PM) and the solvent composition (SC); subjecting mixture (M-0) to conditions for dissolving the polyamide (PA66) based polymer (D1) comprising a temperature T(D1) in the range of from 50 to 280°C and a time t(D1) sufficient to at least partially dissolve the polyamide (PA66) based polymer, preferably for a time of at least 5 minutes, in particular in the range of from 15 to 600 minutes, obtaining a mixture (M-1) comprising the solvent composition (SC), dissolved polyamide (PA66) based polymer, filler (F1), and insoluble residues; and separating the filler (F1) and insoluble residues from mixture (M-1) obtaining mixture (M-2) comprising the filler (F1) and insoluble residues, and mixture (M-3) comprising the solvent composition (SC) and dissolved polyamide (PA66) based polymer. The present invention also relates to the filler obtained in the process as well as a polyamide (PA66) based polymer obtained according to said process.Modern, high resilience composite plastics are often based on reinforced, in particular glass fiber-reinforced thermoplastics, in particular polyamides.Known recycling or degradation processes of reinforced polyamides often result in the degradation of the fillers as well which makes them unsuitable for further use.Depolymerization processes for polyamides are in principle known. Depending on the monomers used for the preparation of the polyamide, the depolymerization processes differ strongly. For example PA6 is prepared using only one monomer and also in the depolymerization, only one cyclic monomer is obtained. In contrast to this, polyamide 66 is prepared using two monomers. In the depolymerization process, typically oligomers are obtained in a first step, which also results in a different work-up process.WO202384441 describes a process for the solvent-based separation of glass fibers from PA6 compounds by using a polyol as solvent at elevated temperature, filtering-off the glass fibers, precipitating the dissolved polymer residues and exposing the obtained material to neutral hydrolysis conditions. The treatment of PA66 compounds is not mentioned in the patent.US5430068 describes a process for the solvent-based separation of polyamides from filler materials involving a polyol or aliphatic carboxylic acid and successive precipitation of the polyamide from said solvent.W02001094457 describes a process for the solvent-based separation of polyamides from filler materials involving a solvent at elevated temperature, partially depolymerizing the polymer to <90% of its original molecular weight, separating the insoluble fraction from the mixture and recovering the partially-depolymerized nylon from solution and repolymerizing the obtained polymer.The harsh conditions used according to the state of the art for the depolymerization do not allow for the reuse of the polymers as well as the fillers. It was an object of the present invention to provide a process which allows recycling of the polyamide and the fillers used in reinforced polyamide engineering plastics.According to the present invention, this object is achieved by a process for treating a polymeric material (PM) comprising a polyamide (PA66) based polymer and at least one filler (F1), the process comprising(a) providing a polymeric material (PM) comprising a polyamide (PA66) based polymer and at least one filler (F1) and a solvent composition (SC) comprising at least one solvent (S1 ) with a Hansen parameter H in the range of from 10 to 25 MPa05;(b) preparing a mixture (M-0) from the polymeric material (PM) and the solvent composition (SC);(c) subjecting mixture (M-0) to conditions for dissolving the polyamide (PA66) based polymer (D1) comprising a temperature T(D1) in the range of from 50 to 280°C and a time t(D1) sufficient to at least partially dissolve the polyamide (PA66) based polymer, preferably for a time of at least 5 minutes, in particular in the range of from 15 to 600 minutes, obtaining a mixture (M-1) comprising the solvent composition (SC), dissolved polyamide (PA66) based polymer, filler (F1), and insoluble residues;(d) separating the filler (F1) and insoluble residues from mixture (M-1) obtaining mixture (M-2) comprising the filler (F1) and insoluble residues, and mixture (M-3) comprising the solvent composition (SC) and dissolved polyamide (PA66) based polymer.It was surprisingly found that the process according to the presented invention allows for the recovery of mostly unharmed filler, such as for example glass fibers, from PA66 engineering plastics from end-of-life waste-streams. By applying the process conditions according to the present invention, the impact of harsh conditions usually applied to a reaction mixture for the full remonomerization of PA66 engineering plastics on the filler, in particular on glass fibers can be avoided. The obtained filler, such as fibrous fillers, for example glass fibers, can be reused to produce novel polymer compounds, while the full recovery or remonomerization of the obtained polymers enables a purification of the polymers or monomers necessary for end-of-life waste sources.Surprisingly, glass fibers obtained from the end-of-life PA66 engineering plastics can be selectively obtained from such material and show no signs of degradation, enabling a recycle stream of such materials. The full remonomeriza- tion of the recovered polymer further enables the production of virgin quality recycled polyamide 66.The unit Kelvin has the same scaling as the unit degrees Celsius. Accordingly, a temperature difference of 1 Kelvin corresponds to a difference of 1 degree Celsius. The temperature of 0 Kelvin corresponds to -273.15 degrees Celsius.The process according to the present invention comprises steps (a), (b), (c), and (d) and may comprise further steps. According to step (a), a polymeric material (PM) comprising a polyamide (PA66) based polymer and at least one filler (F1) and a solvent composition (SC) comprising at least one solvent (S1) with a Hansen parameter H of 10 MPa0 5or greater than 10 MPa0 5, preferably in the range of from 10 MPa0 5to 25 MPa0 5. According to step (b), a mixture (M-0) from the polymeric material (PM) and the solvent composition (SC) is prepared. Mixture (M-0) may comprise further components.The polymeric material (PM) comprises a polyamide (PA66) based polymer and at least one filler (F1) and may comprise further polymeric materials or additives. Preferably, the polymeric material (PM) comprises the polyamide (PA66) based polymer in an amount of at least 50% by weight, more preferable in an amount of at least 60% by weight, in particular in an amount of more than 70% by weight, particularly preferred more than 80% by weight based on the polymeric material. The polymeric material may comprise further polymers such as for example polyethylene or polypropylene.Regarding the polymeric material (PM) which is provided according to (a), it is preferred that it is provided in solid form, more preferably in the form of particles such as granules. The polymeric material (PM) preferably is an end-of- life material. In a preferred embodiment, the starting polymer or polyamide-containing compositions are mechanically comminuted to an average particle size from 0.1 to 50 mm, preferably from 2 to 20 mm before splitting. The comminution can be carried out in a commercial mill, for example in a cutting mill, or, preferably, in particular when the compositions used contain hard materials such as metal inserts, for example bolts, in a hammer mill.Metal parts present in the material thus comminuted can be removed in a drying separation process using an air table, preferably with subsequent induction separation, using for example a free-fall tube separator, for complete removal of the metal parts, or in a wet separation process.The term "particle” as used in this context of the present invention comprises optionally pre-formed granules, and also comprises shredded pieces.The solvent composition (SC) comprises at least one solvent (S1) but may also comprise further solvents. The solvent (S1) is defined based on Hansen parameters, wherein a three dimensional rectangular Hansen room is definedby the parameter for energy from dispersion forces between molecules (D) being in the range from 14 to 20 MPa05, the parameter for energy from dipolar intermolecular force between molecules (P) being greater than 8 and the parameter for energy from hydrogen bonds between molecules (H) being in the range of from 10 to 30 MPa05. The Hansen parameters are disclosed in Charles M. Hansen: Hansen Solubility Parameters - A User's Handbook. CRC Press, 2007 and Chem. Rev. 1975, 75, 6, 731 . Solvent (S1) has a Hansen Parameter H of 10 MPa05or greater than 10, preferably in the range of from 10 to 25 MPa05. In particular, solvent (S1) has a Hansen Parameter H of the range of from 12 to 22 MPa05, more preferable in the range of from 15 to 20 MPa05. Preferably, solvent (S1) has a Hansen parameter P of 8 MPa05or greater than 8 MPa05. According to a further embodiment, the present invention therefore is also directed to a process as disclosed above, wherein the solvent (S1) has a Hansen parameter P of 8 MPa05or greater than 8 MPa05. Suitable solvents are for example suitable polar solvents such as glycols or short- chained carboxylic acids. The solvent composition (SC) may also comprise two or more solvents with a Hansen Parameter H of 10 MPa05or greater than 10 MPa05.It has been found that solvents with a Hansen Parameter H in the range according to the present invention are particularly suitable for dissolving the polyamide (PA66) based polymer.Suitable solvents (S1) preferably have a boiling point of greater than 200°C, more preferable greater than 210°C, in particular greater than 220°C.According to step (c), mixture (M-0) is subjected to a set of conditions (D1) which are suitable for dissolving the polyamide (PA66) based polymer. According to the present invention, the conditions for dissolving the polyamide (PA66) based polymer (D1) comprise a temperature T(D1) in the range of from 50 to 280°C and a time t(D1) in the range of from 15 to 120 minutes. In step (c), a mixture (M-1) is obtained comprising the solvent composition (SC), dissolved polyamide (PA66) based polymer, filler (F1), and insoluble residues.Mixture (M-0) is prepared from the polymeric material (PM) and the solvent composition (SC). Suitable solvents (S1) may be selected from the group consisting of water and glycols, preferably ethylene glycol and diethylene glycol, in particular diethylene glycol, and C1 to C6 carboxylic acids, preferably formic acid and acetic acid. According to a further embodiment, the present invention is also directed to a process as disclosed above, wherein the solvent (S1) is selected from the group consisting of water and glycols, preferably diethylene glycol, and C1 to C6 carboxylic acids, preferably formic acid and acetic acid. According to a further embodiment, the solvent composition comprises less than 100 ppm ethylene glycol and / or less than 100 ppm methanol. It is possible to dissolve the polyamide (PA66) based polymer at a high temperature. The set of conditions (D1) applied according to the present invention is suitable to dissolve the polyamide (PA66) based polymer without negative effects on the filler (F1). Preferably more than 90% of the polyamide (PA66) based polymer in the polymeric material are dissolved, more preferable more than 95%, in particular more than 98%, particularly preferred more than 99% of the polyamide (PA66) based polymer in the polymeric material.Typically, the temperature T(D1) is in the range of from 50 to 280°C, preferably 65°C or greater, preferably 80°C or greater, in particular 90°C or greater. Preferably, the temperature T(D1) is 250°C or less, in particular 230°C or less. The temperature T(D1) preferably in the range of from 90- to 250°C, more preferably 200 to 230°C. The time t(D1) typically is sufficient to at least partially dissolve the polyamide (PA66) based polymer, preferably a time of at least 5 minutes, in particular in the range of from 15 to 600 minutes. The conditions preferably are adjusted to allow full dissolution of the polyamide (PA66) based polymer. Preferably, the factor F(D1)=T(D1) x t(D1) is in the range of from 100 to 700 K*h. According to a further embodiment, the present invention is also directed to a process as disclosed above, wherein the factor F(D1)=T(D1) x t(D1) is in the range of from 100 to 700 K*h. Mixture (M-1) comprising the solvent composition (SC), dissolved polyamide (PA66) based polymer, filler (F1), and insoluble residues is obtained.According to step (d) of the process of the present invention, the filler (F1) and insoluble residues are separated from mixture (M-1) obtaining mixture (M-2) comprising the filler (F1) and insoluble residues, and mixture (M-3) comprising the solvent composition (SC) and dissolved polyamide (PA66) based polymer. Mixture (M-2) comprises the filler (F1) and insoluble residues, and mixture (M-3) comprises the solvent composition (SC) and dissolved polyamide (PA66) based polymer.Suitable methods for separation are in principle known to the person skilled in the art. Suitable methods are for example filtration, centrifugation, or decantation. Suitable methods may also be combined depending on the nature of the filler (F1) and the polyamide (PA66) based polymer. Preferably, the filler (F1) is a fibrous filler.According to a further embodiment, the present invention is also directed to a process as disclosed above, wherein the filler (F1) is a fibrous filler, preferably a fibrous filler selected from the group consisting of glass fibers, carbon fibers, aramid fibers, potassium titanate fibers, fibers composed of liquid-crystal polymers, metal fibers, polyester fibers, polyamide fibers, organic fibrous fillers and inorganic fibrous fillers.Particularly suitable separation methods are for example filtration steps, for example filtration at elevated temperature. The temperature for the separation according to step (d) may for example be in the range of from 50 to 250°C, preferably in the range of from 100 to 250°C, more preferable in the range of from 200 to 230°C.According to a further embodiment, the present invention is also directed to a process as disclosed above, wherein the separation according to step (d) is carried out using filtration, centrifugation or decantation, preferably at a temperature in the range of from 50 to 250°C.Step (d) may also comprise further washing steps, in particular washing with the solvent (S1 ).According to the process of the present invention, also the further additive (F2) may be present in the polymeric material (PM) which may also be separated from the polymer. According to a further embodiment, the present inventionis also directed to a process as disclosed above, wherein the polymeric composition (PM) comprises a further additive (F2) selected from dyes, UV absorbers, pigments, fillers, flame retardants, antistatic agents, antibacterial agent, and nucleating agents. Suitable methods for separating the further additive (F2) from the polymeric material may for example selected from extraction with a suitable solvent or adsorption using adsorbent such as for example active carbon.Mixture (M-3) is obtained in step (d) comprises the solvent composition (SC) and dissolved polyamide (PA66) based polymer. According to the present invention, it is possible to treat mixture (M-3) to obtain the polymer. It is for example possible to precipitate the polymer, for example by the addition of a suitable anti-solvent or by cooling or by flash evaporation or a combination thereof. According to the present invention, it is also possible to treat mixture (M-3) before precipitation. The solvent composition (SC) may be removed partially or completely to recover the polymer.According to a further embodiment, the present invention is also directed to a process as disclosed above, wherein the process further comprises(e*) subjecting mixture (M-3) to conditions suitable to precipitate the polyamide (PA66) based polymer.According to a further embodiment, the present invention is also directed to a process as disclosed above, wherein precipitation is carried out by addition of an anti-solvent, cooling or removal of the solvent composition (SC).The mixture (M-3) preferably is cooled to a temperature in the range of from 5 to 50°C, preferably 20 to 25°C and optionally water may be added to precipitate the dissolved polymer. Preferably, no water is added according to the present invention. The polymer preferably is obtained by filtration of the suspension at ambient temperature according to this embodiment.In the context of the present invention, it is also possible to subject mixture (M-3) or the polymer obtained to further treatment steps to improve the degree of polymerization. Suitable conditions for the polymerization are in principle known and are for example disclosed in Ullmann's Encyclopedia of Industrial Chemistry, "Polyamides” Herzog, B., Kohan, M.I., Mestemacher, S.A., Pagilagan, R.U., Redmond, K. and Sarbandi, R. (2024).According to a further embodiment, the present invention is also directed to a process as disclosed above, further comprising subjecting the mixture (M-3) to polyamide (PA66) polymerization conditions, obtaining a recycled polyamide 66.According to an alternative embodiment, it is also possible to subject mixture (M-3) to suitable conditions (D2) to achieve depolymerization of the polyamide (PA66) based polymer and isolate the monomers in return. It is for example possible to expose the mixture to alkaline conditions. Suitable methods and conditions for the depolymerization are in principle known to the person skilled in the art.According to a further embodiment, the present invention therefore is also directed to a process as disclosed above, wherein the process further comprises(e) subjecting mixture (M-3) to depolymerization conditions (D2) suitable to depolymerize the polyamide (PA66) based polymer;(f) separating the monomers obtained in step (e).Suitable depolymerization conditions (D2) may be chosen in wide ranges to achieve a high degree of depolymerization. Preferably, the depolymerization temperature T(D2) is 150°C or more, preferably 160°C or more, preferably 170°C or more, preferably 180°C or more, preferably 190°C or more, preferably 200°C or more. Preferably, the depolymerization temperature T(D2) is 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.Suitable is for example a temperature T(D2) in the range of from 150 to 300°C, preferably 160 to 250°C, more preferably 160 to 180°C. The depolymerization time t(D2) typically is at least 5 minutes and may be in the range of from 5 to 360 minutes, preferably from 5 to 60 minutes, more preferable from 20 to 30 minutes. The obtained product mixture preferably is further processed to yield adipic acid and hexamethylene diamine. Suitable methods are in principle known to the person skilled in the art and are disclosed for example in DE4219756.According to a further embodiment, the present invention is also directed to a process as disclosed above, wherein the depolymerization conditions (D2) comprise a depolymerization temperature T(D2) in the range of from 150 to 300°C and a depolymerization time t(D2) in the range of from 5 to 360 minutes, in the presence of a base, wherein the factor F(D2)=T(D2) x t(D2) is in the range of from 50 to 2500 K*h, preferably in the range of from 50 to 400 K*h, obtaining a mixture (M-4) comprising the solvent composition (SC), soluble monomers and / or oligomers of the polyamide (PA66) based polymer, insoluble monomers and insoluble residues.Suitable conditions for the depolymerization may for example include treatment with a base, preferably in an amount of from 2.0 to 3.0 equivalents of inorganic base per repeating unit, preferably 2.0 to 2.2 equivalents. Bases such assodium hydroxide or potassium hydroxide may be used in a suitable solvent such as for example a mixture of water and a short-chained aliphatic alcohol, for example methanol or ethanol.According to a further embodiment, the present invention is also directed to a process as disclosed above, wherein depolymerization according to step (e) is carried out in the presence of a base.The bases used for splitting the polymers are in general alkali metal hydroxides such as lithium hydroxide, sodium hydroxide and potassium hydroxide, preferably sodium hydroxide, or mixtures thereof, preferably a mixture of sodium hydroxide and potassium hydroxide.It is preferable to use from 2.0 to 3.0, preferably from 2.0 to 2.2, equivalents of alkali metal hydroxide per repeat unit of polymer. If less than 2.0 equivalents of base are used, the result is in general an undesirably high proportion of oligomer. The bases used for splitting the polymers are in general alkali metal hydroxides such as lithium hydroxide, sodium hydroxide and potassium hydroxide, preferably sodium hydroxide, or mixtures thereof, preferably a mixture of sodium hydroxide and potassium hydroxide.The monomers obtained may be separated according to step (f) of the process according to the present invention. Suitable methods are in principle known and may include further treatment steps such as washing steps, distillation steps or precipitation steps.The monomers obtained may be reused to prepare a polyamide, in particular to prepare polyamide (PA66). According to a further embodiment, the present invention is also directed to the process as disclosed above, further comprising subjecting the monomers obtained to polyamide (PA66) polymerization conditions, obtaining a recycled polyamide 66.In the context of the present invention, it is preferable to reuse the monomers obtained or the dissolved polymer obtained or the isolated polymer obtained, in particular for the preparation of polyamide (PA66). According to a further aspect, the present invention is also directed to the use of mixture (M-3), obtainable or obtained by a process as disclosed above, for preparing polyamide (PA66). According to a further aspect, the present invention is also directed to the use of one or more monomers, obtainable or obtained by a process as disclosed above, for preparing polyamide (PA66).Also the filler (F1) may be reused according to the present invention. According to a further aspect, the present invention is also directed to a filler, obtainable or obtained by a process according to the process as disclosed above, exhibiting one or more of the following properties: a diameter of the fibers in a range of from 5 to 35 pm, preferably in the range of from 6 to 25 pm, in particular in the range of from 8 to 17 pm; an average length of the fibers dO.5 in the range of from 100 to 600 pm, preferably in the range of from 200 to 500 pm, in particular in the range of from 250 to 450 pm.The length and the diameter of the fibers are determined using optical methods preferably according to the method disclosed in the examples section.Due to the specific process of the present invention the properties of the filler obtained are suitable to reuse the filler. According to the present invention, the filler obtained is suitable to be reused as a filler for the preparation of polymeric materials, such as reinforced polymeric materials, in particular reinforced polyamides. According to a further aspect, the present invention therefore is also directed to the use of the filler obtainable or obtained by a process as disclosed above, for preparing a polymeric product.The present invention is also directed to a process for preparing a polymeric product comprising adding the filler obtainable or obtained by the process as disclosed above to a polymer, in particular a polymer as disclosed in detail in paragraphs

[2009] and

[2010] of Reference RF1 . The present invention is also directed to a process for preparing a polymeric product as disclosed in detail in paragraphs

[2009] and

[2010] of Reference RF1 , the process comprising mixing the filler obtainable or obtained by the process as disclosed above with a polymer, in particular a polymer as disclosed in detail in paragraphs

[2009] and

[2010] of Reference RF1 . The process may also comprise further steps, such as for example treating the filler used or shaping the polymeric product obtained.According to a further aspect, the present invention is also directed to a process preferably a process as disclosed above, comprising the step: converting the filler and / or monomer and / or oligomer obtainable by or obtained by the process as disclosed above or a chemical material obtainable by or obtained by the process as disclosed above to obtain a product.According to a further embodiment, the present invention is also directed to a process as disclosed above, wherein the product 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; or iii) cleaning polymer, cleaning surfactant, descaling compound, cleaning biocide or composition 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; orvi) 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.According to a further embodiment, the present invention is also directed to a process as disclosed above, wherein the content of the polymeric material (PM) in the product 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 the content of the polymeric material (PM) in the product 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.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 is a product as described in Reference RF1; paragraphs

[1000] to

[8005] , Preferably, the process described herein is further a process for the production of a product.The converting step to obtain the product 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 dioxid, 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. (Methacrylates 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 / or flame 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”, as used herein, comprises rheology, polycarboxylate, alkoxylated polyalkylenamine, alkoxylated polyalkylenimine, polyether-based, dye inhibition and soil release cleaning polymers defined inmore detail in paragraphs

[3035] to

[3044] of Reference RF1. The term "industrial use surfactant”, as used herein, comprises non-ionic, 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 "composition and / 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 agrochemi- cally 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 pharmaceuticalexcipients, 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, Citranax- anthin, 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 ammonium propionate, 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 sesquiterpe- noids, 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 poly- mer(s), styrene butadiene dispersion(s), aqueous dispersion(s) comprising composite particles, acrylate alkyd hybrid dispersion(s), polyurethane(s) (including UV-curable polyurethanes) and polyurethane - poly(meth)acrylate hybrid polymer(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 compositions) 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 pol- yol(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 more detail in section

[6020] of Reference RF1. The term "inorganic binder composition” comprising the polymeric dispersant(s), 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”, 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.The present invention is further illustrated by the following set of embodiments and combinations of embodiments resulting from the dependencies and back-references as indicated. In particular, it is noted that in each instance where a range of embodiments is mentioned, for example in the context of a term such as "The process of any one of embodiments 1 to 3", every embodiment in this range is meant to be explicitly disclosed for the skilled person, i.e. the wording of this term is to be understood by the skilled person as being synonymous to "The process of any one of embodiments 1 , 2 and 3". Further, it is explicitly noted that the following set of embodiments represents a suitably structured part of the general description directed to preferred aspects of the present invention, and, thus, suitably supports, but does not represent the claims of the present invention.1 . Process for treating a polymeric material (PM) comprising a polyamide (PA66) based polymer and at least one filler (F1), the process comprising(a) providing a polymeric material (PM) comprising a polyamide (PA66) based polymer and at least one filler (F1) and a solvent composition (SC) comprising at least one solvent (S1) with a Hansen parameter H of 10 MPa0 5or greater than 10 MPa0 5, preferably in the range of from 10 to 25 MPa0 5;(b) preparing a mixture (M-0) from the polymeric material (PM) and the solvent composition (SC);(c) subjecting mixture (M-0) to conditions for dissolving the polyamide (PA66) based polymer (D1) comprising a temperature T(D1) in the range of from 50 to 280°C and a time t(D1) sufficient to at least partially dissolve the polyamide (PA66) based polymer, preferably for a time of at least 5 minutes, in particular in the range of from 15 to 600 minutes7obtaining a mixture (M-1) comprising the solvent composition (SC), dissolved polyamide (PA66) based polymer, filler (F1), and insoluble residues;(d) separating the filler (F1) and insoluble residues from mixture (M-1) obtaining mixture (M-2) comprising the filler (F1) and insoluble residues, and mixture (M-3) comprising the solvent composition (SC) and dissolved polyamide (PA66) based polymer.2. The process according to embodiment 1 , wherein step (c) is carried out in the presence of a base, wherein the factor F(D1 )=T(D1 ) x t(D1 ) is in the range of from 100 to 700 K*h.3. The process according to embodiment 1 or 2, wherein the process further comprises(e) subjecting mixture (M-3) to depolymerization conditions (D2) suitable to depolymerize the polyamide (PA66) based polymer;(f) separating the monomers obtained in step (e).4. Process for treating a polymeric material (PM) comprising a polyamide (PA66) (PA66) based polymer and at least one filler (F1), the process comprising(a) providing a polymeric material (PM) comprising a polyamide (PA66) based polymer and at least one filler (F1) and a solvent composition (SC) comprising at least one solvent (S1 ) with a Hansen parameter H of 10 MPa0 5or greater than 10 MPa0 5, preferably in the range of from 10 to 25 MPa0 5;(b) preparing a mixture (M-0) from the polymeric material (PM) and the solvent composition (SC);(c) subjecting mixture (M-0) to conditions for dissolving the polyamide (PA66) based polymer (D1) comprising a temperature T(D1) in the range of from 50 to 280°C and a time t(D1) sufficient to at least partially dissolve the polyamide (PA66) based polymer, preferably for a time of at least 5 minutes, in particular in the range of from 15 to 600 minutes7obtaining a mixture (M-1) comprising the solvent composition (SC), dissolved polyamide (PA66) based polymer, filler (F1), and insoluble residues;(d) separating the filler (F1) and insoluble residues from mixture (M-1) obtaining mixture (M-2) comprising the filler (F1) and insoluble residues, and mixture (M-3) comprising the solvent composition (SC) and dissolved polyamide (PA66) based polymer,(e) subjecting mixture (M-3) to depolymerization conditions (D2) suitable to depolymerize the polyamide (PA66) based polymer;(f) separating the monomers obtained in step (e).5. The process according to embodiment 3 or 4, wherein the depolymerization conditions (D2) comprise a depolymerization temperature T(D2) in the range of from 150 to 300°C and a depolymerization time t(D2) in the range of from 5 to 360 minutes, in the presence of a base, wherein the factor F(D2)=T(D2) x t(D2) is in the range of from 50 to 2500 K*h, preferably in the range of from 50 to 400 K*h, obtaining a mixture (M-4) comprising the solvent composition (SC), soluble monomers and / or oligomers of the polyamide (PA66) based polymer, insoluble monomers and insoluble residues;6. The process according to any one of embodiments 3 to 5, wherein depolymerization according to step (e) is carried out in the presence of a base.7. The process according to embodiment 1 , wherein the process further comprises(e*) subjecting mixture (M-3) to conditions suitable to precipitate the polyamide (PA66) based polymer.8. Process for treating a polymeric material (PM) comprising a polyamide (PA66) based polymer and at least one filler (F1), the process comprising(a) providing a polymeric material (PM) comprising a polyamide (PA66) based polymer and at least one filler (F1) and a solvent composition (SC) comprising at least one solvent (S1 ) with a Hansen parameter H of 10 MPa0 5or greater than 10 MPa0 5, preferably in the range of from 10 to 25 MPa0 5;(b) preparing a mixture (M-0) from the polymeric material (PM) and the solvent composition (SC);(c) subjecting mixture (M-0) to conditions for dissolving the polyamide (PA66) based polymer (D1) comprising a temperature T(D1) in the range of from 50 to 280°C and a time t(D1) sufficient to at least partially dissolve the polyamide (PA66) based polymer, preferably for a time of at least 5 minutes, in particular in the range of from 15 to 600 minutes7obtaining a mixture (M-1) comprising the solvent composition (SC), dissolved polyamide (PA66) based polymer, filler (F1), and insoluble residues;(d) separating the filler (F1) and insoluble residues from mixture (M-1) obtaining mixture (M-2) comprising the filler (F1) and insoluble residues, and mixture (M-3) comprising the solvent composition (SC) and dissolved polyamide (PA66) based polymer;(e*) subjecting mixture (M-3) to conditions suitable to precipitate the polyamide (PA66) based polymer.9. The process according to embodiment 8, wherein precipitation is carried out by addition of an anti-solvent, cooling or removal of the solvent composition (SC).10. The process according to any one of embodiments 1 to 9, wherein the solvent (S1) has a Hansen parameter P of 8 MPa05or greater than 8 MPa05.11 . The process according to any one of embodiments 1 to 10, wherein the solvent (S1) is selected from the group consisting of water and glycols, preferably ethylene glycol and diethylene glycol, and C1 to C6 carboxylic acids, preferably formic acid and acetic acid.12. The process according to any one of embodiments 1 to 11, wherein the filler (F1) is a fibrous filler, preferably a fibrous filler selected from the group consisting of glass fibers, carbon fibers, aramid fibers, potassium titanate fibers, fibers composed of liquid-crystal polymers, metal fibers, polyester fibers, polyamide fibers, organic fibrous fillers and inorganic fibrous fillers.13. The process according to any one of embodiments 1 to 12, wherein the separation according to step (d) is carried out using filtration, centrifugation or decantation, preferably at a temperature in the range of from 50 to 250°C.14. The process according to any one of embodiments 1 to 13, wherein the polymeric composition (PM) comprises a further additive (F2) selected from dyes, UV absorbers, pigments, fillers, flame retardants, antistatic agents, antibacterial agent, and nucleating agents.15. The process according to any one of embodiments 1 to 14, further comprising subjecting the mixture (M-3) to a treatment to obtain the polymer dissolved therein and subject the polymer to polyamide (PA66) polymerization conditions, obtaining a recycled polyamide 66.16. Use of mixture (M-3), obtainable or obtained by a process according to any one of embodiments 1 to 15, for preparing polyamide 66.17. The process according to any one of embodiments 2 to 15, further comprising subjecting the monomers obtained to polyamide (PA66) polymerization conditions, obtaining a recycled polyamide 66.18. Use of one or more monomers, obtainable or obtained by a process according to any one of embodiments 2 to 15, for preparing polyamide 66.19. Filler, obtainable or obtained by a process according to any one of embodiments 1 to 15, exhibiting one or more of the following properties: a diameter of the fibers in a range of from 5 to 35 pm, preferably in the range of from 6 to 25 pm, in particular in the range of from 8 to 17 pm;an average length of the fibers d0.5 in the range of from 100 to 600 m, preferably in the range of from 200 to 500 pm, in particular in the range of from 250 to 450 pm20. Use of the filler obtainable or obtained by a process according to any one of embodiments 1 to 15, for preparing a polymeric product.21 . Process, preferably according to any one of embodiments 1 to 15, for preparing a product comprising adding a filler obtainable or obtained by a process according to any one of embodiments 1 to 17 to a polymer to obtain the product.22. Process, preferably according to any one of the embodiments 1 to 15, comprising the step: converting the filler and / or monomer and / or oligomer obtainable by or obtained by the process according to any one of embodiments 1 to 15 or a chemical material obtainable by or obtained by the process according to any one of embodiments 1 to 15 to obtain a product.23. Process according to embodiment 22, wherein the product 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; or iii) cleaning polymer, cleaning surfactant, descaling compound, cleaning biocide or composition or formulation thereof; or iv) agrochemical composition, agrochemical formulation auxiliary or agrochemically ac-tive 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, hy-perbranched 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 in-gredient or composition or formulation thereof; or viii) polymer B, polymer composition B, coating composition, other functional composition, foil, molded body, coating or coated substrate.24. Process according to any one of embodiment 22 or 23, wherein the content of the polymeric material (PM) in the polymer product 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, morepreferably 80 weight-% or more, more preferably 90 weight-% or more, more preferably 95 weight-% or more; and / or wherein the content of the polymeric material (PM) in the product 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.The present invention is further illustrated by the following examples.ExamplesExample 1 : Removal of glass fibers from PA66 compoundsA mixture of 5 g PA66 (Ultramid A3WG6 BK564, containing 1.5 g of glass fibers) and 5 g diethylene glycol were filled in a microwave reactor equipped with a magnetic stirrer. The reaction vessel was heated to 230°C for 20 min. The obtained suspension was filtered at 200°C and the filter cake was washed with water (2x3 ml) to yield 1 .4 g (-93%) of glass fibers. The reaction mixture was cooled to ambient temperature and water (10 ml) was added to precipitate the polymer in solution. The solid polymer was separated from the solvent mixture by filtration and dried in vacuo to yield 3.2 g of purified PA66 polymer (91%).Example 2: Depolymerization of PA66 under alkaline conditionsA mixture of 40 g PA66 (Ultramid A3WG6 BK564, containing 12 g glass fibers), 85 g methanol, 15 g water and 9.9 g sodium hydroxide were filled in an autoclave equipped with a mechanical stirrer. The reaction vessel was inertized with 30 bar nitrogen and kept under pressure. The stirrer was set to 60 RPM and the reaction temperature was increased to 220°C. After the target temperature was reached, the reaction was stirred at 220°C for 10 min and then immediately cooled to ambient temperature. The reaction mixture was filtered and washed with methanol (3x10 g) and freed of all volatiles in vacuo to yield 13.1 g hexamethylendiamine (91% yield). The filter cake was further washed with hot water and the combined washing phases were dried in vacuo to yield 22.53 g of sodium adipate (96% yield)The content of the glass fibers GF1 was determined as follows: 5 mg compound have been placed in the chamber of a TGA device (Q5000IR, TA instruments) and heated until 600°C at 10K / Min. the weight loss during this heating is the polymer content of the compound. Content of fiber correspond to 1 - (Polymer content)Solubility testsThe solubility was tested in different solvents at different temperatures. The results are summarized in table 1.Table 1Measurement of the glass fiber length distributionBefore measuring the glass fiber length distribution, the polymer samples were incinerated at 650°C for 1-2 hours.The glass fiber length distribution was determined using the following method:Carefully remove a spatula tip from the glass fibers (otherwise fiber breakage and frit abrasion are possible!) and transfer it to the glass bottle.Add 1-2 drops of glycerine (as a dewetting agent) and fill up with deionized water (usually up to approx. 100 mL).Shake the jar well. In the meantime, visually check for homogeneous distribution of the fibersQuickly transfer the solution to the Petri dish in the scanner support so that the bottom is covered with sufficient liquid (approx. glass). (Caution: Do not fill the Petri dish more than halfway up with liquid!) If possible, fill without adding more liquid, as mainly small fibers are transferred during the second pouring and the fiber distribution pattern changes.Wait approx. 1 minute before taking the picture until all fibers have really settled.Visual inspection of fiber distribution and quantity by SEM: Those were recorded on a Phenom Pharos table top SEM (from Thermo Fisher Scientific). For the preparation a few milligrams of the fibers were powdered onto an electrically conductive, double sided adhesive tab fixed to a common SEM sample holder stub. The measurements were conducted with acceleration voltages from 10-15 kV, a working distance around 8 mm and a pressure around 60 Pa.Literature citedWO202384441US5430068 W02001094457Charles M. Hansen: Hansen Solubility Parameters - A User's Handbook. CRC Press, 2007 and Chem. Rev. 1975, 75, 6, 731Ullmann's Encyclopedia of Industrial Chemistry, "Polyamides” Herzog, B., Kohan, M.I., Mestemacher, S.A., Pagi- lagan, R.U., Redmond, K. and Sarbandi, R. (2024) DE4219756

Claims

Claims1 . Process for treating a polymeric material (PM) comprising a polyamide (PA66) based polymer and at least one filler (F1), the process comprising(a) providing a polymeric material (PM) comprising a polyamide (PA66) based polymer and at least one filler (F1) and a solvent composition (SC) comprising at least one solvent (S1 ) with a Hansen parameter H in the range of from 10 to 25 MPa0 5;(b) preparing a mixture (M-0) from the polymeric material (PM) and the solvent composition (SC);(c) subjecting mixture (M-0) to conditions for dissolving the polyamide (PA66) based polymer (D1) comprising a temperature T(D1) in the range of from 50 to 280°C and a time t(D1) sufficient to at least partially dissolve the polyamide (PA66) based polymer, preferably for a time of at least 5 minutes, in particular in the range of from 15 to 600 minutes, obtaining a mixture (M-1) comprising the solvent composition (SC), dissolved polyamide (PA66) based polymer, filler (F1), and insoluble residues;(d) separating the filler (F1) and insoluble residues from mixture (M-1) obtaining mixture (M-2) comprising the filler (F1) and insoluble residues, and mixture (M-3) comprising the solvent composition (SC) and dissolved polyamide (PA66) based polymer.

2. The process according to claim 1 , wherein the process further comprises(e) subjecting mixture (M-3) to depolymerization conditions (D2) suitable to depolymerize the polyamide (PA66) based polymer;(f) separating the monomers obtained in step (e).

3. The process according to claim 2, wherein the depolymerization conditions (D2) comprise a depolymerization temperature T(D2) in the range of from 150 to 300°C and a depolymerization time t(D2) in the range of from 5 to 360 minutes, in the presence of a base, wherein the factor F(D2)=T(D2) x t(D2) is in the range of from 50 to 2500 K*h, obtaining a mixture (M-4) comprising the solvent composition (SC), soluble monomers and / or oligomers of the polyamide (PA66) based polymer, insoluble monomers and insoluble residues;4. The process according to claim 1 , wherein the process further comprises(e*) subjecting mixture (M-3) to conditions suitable to precipitate the polyamide (PA66) based polymer.

5. The process according to any one of claims 1 to 4, wherein the polar solvent is selected from the group consisting of water and glycols, preferably 1 ,4-butanediol and diethylene glycol, and C1 to C6 carboxylic acids, preferably formic acid and acetic acid.

6. The process according to any one of claims 1 to 5, wherein the filler (F1) is a fibrous filler, preferably a fibrous filler selected from the group consisting of glass fibers, carbon fibers, aramid fibers, potassium titanate fibers, fibers composed of liquid-crystal polymers, metal fibers, polyester fibers, polyamide fibers, organic fibrous fillers and inorganic fibrous fillers.

7. The process according to any one of claims 1 to 6, further comprising subjecting the mixture (M-3) to a treatment to obtain the polymer dissolved therein and subject the polymer to polyamide (PA66) polymerization conditions, obtaining a recycled polyamide 66.

8. Use of mixture (M-3), obtainable or obtained by a process according to any one of claims 1 to 7, for preparing polyamide 66.

9. The process according to any one of claims 2 to 7, further comprising subjecting the monomers obtained to polyamide (PA66) polymerization conditions, obtaining a recycled polyamide 66.

10. Use of one or more monomers, obtainable or obtained by a process according to any one of claims 2 to 7, for preparing polyamide 66.11 . Filler, obtainable or obtained by a process according to any one of claims 1 to 7, exhibiting one or more of the following properties: a diameter of the fibers in a range of from 5 to 35 pm, preferably in the range of from 6 to 25 pm, in particular in the range of from 8 to 17 pm; an average length of the fibers d0.5 in the range of from 100 to 600 pm, preferably in the range of from 200 to 500 pm, in particular in the range of from 250 to 450 pm.

12. Process, preferably according to any one of claims 1 to 9, for preparing a product comprising adding a filler obtainable or obtained by a process according to any one of claims 1 to 9 to a polymer to obtain the product.

13. Process, preferably according to any one of the claims 1 to 9, comprising the step: converting the filler and / or monomer and / or oligomer obtainable by or obtained by the process according to any one of claims 1 to 9 or a chemical material obtainable by or obtained by the process according to any one of claims 1 to 9 to obtain a product.

14. Process according to claim 13, wherein the product is selected from:I) building block or monomer; orII) polymer, preferably polymer A, polymer composition, preferably polymer composition A, or polymer product, preferably polymer product A; or iii) cleaning polymer, cleaning surfactant, descaling compound, cleaning biocide or composition 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, hy-perbranched 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.

15. Process according to any one of claims 13 or 14, wherein the content of the polymeric material (PM) in the polymer product 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 the content of the polymeric material (PM) in the product 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.

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