Separation of plastic solvolysis mixtures from filler components

Abstract

The present invention relates to a process for treating a mixture (M1) comprising a solvent composition (SC) comprising a polar solvent (S), soluble oligomers and optionally monomers of a polymer (P1), filler (F1), and optionally further insoluble residues, comprising providing mixture (M1); and separating the filler (F1) and insoluble residues from mixture (M1) obtaining mixture (M-2) comprising the filler (F1) and insoluble residues, and mixture (M-3) comprising the solvent composition (SC) and soluble oligomers and optionally monomers of the polymer (P1), wherein the separation is carried out by filtration at a pressure below 55 bar and a temperature in the range of from 150 to 270°C. The present invention is also directed to the fillers obtainable or obtained by said process as well as the use thereof for preparing a polymeric product.

Description

Separation of Plastic Solvolysis Mixtures from Filler ComponentsThe present invention relates to a process for treating a mixture (M1) comprising a solvent composition (SC) comprising a polar solvent (S), soluble oligomers and optionally monomers of a polymer (P1), filler (F1), and optionally further insoluble residues, comprising providing mixture (M1); and separating the filler (F1) and insoluble residues from mixture (M1) obtaining mixture (M-2) comprising the filler (F1) and insoluble residues, and mixture (M-3) comprising the solvent composition (SC) and soluble oligomers and optionally monomers of the polymer (P1), wherein the separation is carried out by filtration at a pressure below 55 bar and a temperature in the range of from 150 to 270°C. The present invention is also directed to the fillers obtainable or obtained by said process as well as the use thereof for preparing a polymeric product.Modern, high resilience composite plastics are often based on reinforced, in particular glass fiber-reinforced thermoplastics, in particular polyamides.In recycling processes, it is advantageous to separate the fillers, such as glass fibers from polymers to be able to reuse them. In recycling processes, often mixtures are obtained comprising soluble degradation products of the polymers as well as insoluble parts.Furthermore, often the harsh conditions used according to the state of the art 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 reinforced polyamide engineering plastics.W02024008847 describes the separation of a plastic solvolysis mixture by membrane filtration to separate off catalyst in a solvent mixture consisting of alcohols, glycols, amines and mixtures thereof.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. However, this invention aims at sustaining the molecular weight of the polymer in a recycling process without further remonomerization steps, which limits the work-up and purification options.It has been an object of the present invention to provide processes for separating the fillers from polymers in an efficient manner which allows to reuse the fillers.According to the present invention, this object is achieved by a process for treating a mixture (M1) comprising a solvent composition (SC) comprising a polar solvent (S), soluble oligomers and optionally monomers of a polymer (P1 ), filler (F1), and optionally further insoluble residues, comprising(a) providing mixture (M1);(b) separating the filler (F1) and insoluble residues from mixture (M1) obtaining mixture (M-2) comprising the filler (F1) and insoluble residues, and mixture (M-3) comprising the solvent composition (SC) and soluble oligomers and optionally monomers of the polymer (P1 ), wherein step (b) is carried out by filtration at a pressure below 55 bar and a temperature in the range of from 150 to 270°C or by centrifugation or sedimentation, preferably by filtration at a pressure below 55 bar and a temperature in the range of from 180 150 to 270°C.In the context of the present invention, insoluble residues refers to residues which are insoluble under the conditions of the filtration.According to a preferred embodiment, the present invention is also directed to a process for treating a mixture (M1) comprising a solvent composition (SC) comprising water as the polar solvent (S), soluble oligomers and optionally monomers of a polyamide 66 based polymer, filler (F1), and optionally further insoluble residues, comprising(a) providing mixture (M1);(b) separating the filler (F1) and insoluble residues from mixture (M1) obtaining mixture (M-2) comprising the filler (F1) and insoluble residues, and mixture (M-3) comprising the solvent composition (SC) and soluble oligomers and optionally monomers of the polyamide 66 based polymer, wherein step (b) is carried out by filtration at a pressure below 55 bar and a temperature in the range of from 150 to 270°C.It was surprisingly found that it is possible to separate the fillers from oligomers and optionally monomers by filtration from a solution, in particular from an aqueous solution. It has been found that at high temperature, a mixture of short-chain oligomers / monomers is formed, which are soluble in a suitable polar solvent, preferably water. The specific temperature range allows filtration below 55 bar and even below 30 bar.The process according to the present invention comprises steps (a) and (b) but may comprise further steps. According to step (a), mixture (M1) is provided. Mixture (M1) comprises a solvent composition (SC) comprising a polar solvent (S), soluble oligomers and optionally monomers of polymer (P1), filler (F1), and optionally further insoluble residues.Polymer (P1) typically is a condensation polymer, preferably selected from the group consisting of polyesters, polyamides, and polyacetals. Polyesters may be selected from the group consisting of polycarbonates, polybutyleneterephthalates, and polyethyleneterephthalates. Polyamides may be selected from the group consisting of PA 6, PA 66, PA6T66, PA6T6, PA6T6I, PA6I6T, PA666T, PA 12 and PA 46 or mixtures thereof, preferably from the group consisting of PA6 and PA66 or mixtures thereof.According to the present invention, an oligomer of polymer (P1) preferably consist of 2 to 15 building blocks of the polymer, in particular 2 to 10 building block of the polymer (P1). Preferably, the content of oligomers in mixture (M1) is in the range from 50 to 100 % by weight, more preferably more than 70 % by weight, for example 70 to 90 % by weight, in each case based on the weight of the sum of polymer (P1), oligomers or monomers and residues of polymer (P1) present in the mixture (M1).The solvent composition (SC) comprises a polar solvent (S) and may comprise further solvents. Suitable polar solvents are in principle known to the person skilled in the art and include for example sulfolane and protic solvents. The polar solvent (S) preferably is a protic solvent, in particular a solvent selected from the group consisting of alcohols and water or mixtures thereof. Suitable alcohols are for example glycols such as monoethylene glycol, diethylene glycol, or propylene glycol. Suitable alcohols furthermore may be selected from methanol, ethanol, propanol or butanediol or mixtures thereof.Solvent composition (SC) comprises the polar solvent (S), preferably water, and may comprise further solvents. Suitable further solvents are for example further polar solvents in particular alcohols such as for example monols, diols or triols, preferably alcohols selected from methanol, ethanol, propanol, iso-propanol, butanediol, ethylene glycol, diethylene glycol and glycerol, in particular diethylene glycol. Also suitable are further polar solvents such as for example sulfolane or ethylene carbonate. Preferably, the solvent composition (SC) has a vapor pressure below 55 bar.According to a further embodiment, the present invention is also directed to the process as disclosed above, wherein the vapor pressure of the solvent used is below 55 bar, in particular inthe range of from 10 to 40 bar. According to a further embodiment, the present invention is also directed to the process as disclosed above, wherein the solvent composition (SC) is a homogeneous mixture. Preferably, solvent (S) is water. In case the solvent composition comprises further solvents, the ratio of solvent (S) and further solvents, in particular of water to further polar solvents, is preferably in the range of from 1 :3 to 3:1.According to step (b), the filler (F1) and insoluble residues are separated from mixture (M1) obtaining mixture (M-2) comprising the filler (F1) and insoluble residues, and mixture (M-3) comprising the solvent composition (SC) and soluble oligomers and optionally monomers of the polymer (P1). According to the present invention, step (b) is carried out by filtration at a pressure below 55 bar and a temperature in the range of from 150 to 270°C. The temperature and pressure are preferably adjusted depending on the ratio of polymer and solvent composition used. For the process of the present invention, the oligomers and optionally monomers have to be soluble in the solvent composition under the conditions applied. It is also possible to use separation methods such as sedimentation or centrifugation.The separation according to step (b) is carried out at a temperature in the range of from 150 to 270°C, preferably in the range of from 200 to 250°C, in particular in the range of from 200 to 230°C. Furthermore, the separation according to step (b) is carried out at a pressure below 55 bar, preferably below 30 bar, in particular in the range of from 20 to 30 bar. The differential pressure preferably is in the range of from 1 to 10 bar, preferably in the range of from 2 to 8 bar, in particular in the range of from 3 to 5 bar.The pressure preferably is adjusted depending on the solvent composition (SC) used in the process. Unless otherwise noted, the pressure for the separation according to step (b) is the pressure measured upstream of the filter.The ratio of the sum of soluble oligomers and optionally monomers of polymer (P1 ) and the solvent composition (SC) in mixture (M 1 ) may vary in broad ranges and are typically in the range of from 1 :1 to 1 :10. Typically, mixture (M1) comprises the solvent composition (SC) in an amount of from 50 to 90 % by weight. The mixture (M 1) preferably comprises soluble oligomers and optionally monomers of the polyamide based polymer in an amount of from 10 to 40% by weight and the filler (F1) in an amount of from 5 to 25% by weight.According to a further embodiment, the present invention is also directed to the process as disclosed above, wherein mixture (M 1) comprises the solvent composition (SC) in an amount of from 45 to 90 % by weight, soluble oligomers and optionally monomers of the polymer in an amount of from 20 to 50 % by weight and the filler (F1) in an amount of from 5 to 20 % byweight. Preferably, mixture (M1) comprises the solvent composition (SC), soluble oligomers and optionally monomers of the polymer (P1) and the filler (F1) in a ratio of 77:28:12 % by weight.Suitable apparatuses for the filtration according to step (b) are in principle known. Preferably, filters are uses with a pore size in the range of from 2 to 100 pm, in particular 10 to 100 pm.According to a further embodiment, the present invention is also directed to the process as disclosed above, wherein the separation according to step (b) is carried out using filters having a pore size in the range of from 2 to 100 pm.Preferably, the viscosity of mixture (M1) is in the range of from 0.5 to 50 mPa*s, preferably from 0.8 to 5.0 mPa*s, more preferably from 1.0 to 2.0 mPa*s. Preferably, the conditions for the filtration are adjusted to control the viscosity of mixture (M1) for the filtration in the preferred ranges.Typically, fibrous fillers are used in polymeric materials. According to a further embodiment, the present invention is also directed to the process as disclosed above, wherein the fibrous filler (F1) is 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.According to the present invention, mixture (M1) may also comprise further insoluble components, such as for example further additives. According to the process of the present invention, also further additives (F2) may be present in the mixture (M1) which may also be separated from the polymer. According to a further embodiment, the present invention is also directed to the process as disclosed above, wherein mixture (M1) comprises a further additive (F2) selected from dyes, pigments, UV absorbers, fillers, flame retardants, antistatic agents, antibacterial agent, and nucleating agents.Mixture (M1) may be obtained from various processes, such as for example depolymerization processes of a polymeric material. In principle, depolymerization processes for polycondensation polymers, in particular polyamide based polymers are known to the person skilled in the art. In principle, mixture (M1) may be obtained by a process comprising mixing of the components or any other suitable process which results in a respective mixture of components.Preferably, mixture (M1) is obtained by a process comprising depolymerization or at least partial depolymerization of a polymeric material. According to a further embodiment, the present invention is also directed to the process as disclosed above, wherein mixture (M1) is obtained by aprocess comprising at least partial depolymerization of a polymeric material (PM) comprising polymer (P1) and at least one filler (F1).Processes for the depolymerization of polymeric materials comprising polycondensation polymers, in particular polyamide based polymers are in principle known. Also processes which result in partial depolymerization are in principle known. It is for example possible to subject a polymeric material to conditions suitable to achieve partial depolymerization in a suitable solvent mixture. Suitable processes include for example hydrolysis, alcoholysis, such as glycolysis, amminolysis, or hydroglycolysis.The present invention therefore also relates to a process wherein mixture (M1) is obtained from a polymeric material (PM) comprising a polymer (P1) and at least one filler (F1), the process comprising(i*) preparing a mixture (M-0) from the polymeric material (PM) and the solvent composition (SC);(ii*) subjecting mixture (M-0) to conditions for depolymerizing the polymer (P1) obtaining a mixture (M1) comprising the solvent composition (SC), soluble oligomers and optionally monomers of the polymer (P1), filler (F1), and insoluble residues;In particular polyamide based polymers may be depolymerized using hydrolysis under mild conditions.According to one embodiment, the present invention is also directed to a process wherein mixture (M1) is obtained from a polymeric material (PM) comprising a polyamide 66 (PA66) based polymer and at least one filler (F1), the process comprising(i) preparing a mixture (M-0) from the polymeric material (PM) and the solvent composition (SC);(ii) subjecting mixture (M-0) to conditions for depolymerizing the polyamide 66 based polymer obtaining a mixture (M1) comprising the solvent composition (SC), soluble oligomers and optionally monomers of the polyamide 66 based polymer, filler (F1), and insoluble residues;Preferably, step (ii) comprises depolymerization conditions (D1) comprising a depolymerization temperature T(D1) in the range of from 150 to 300°C and a depolymerization time t(D 1 ) of atleast 0.25 hours, preferably in the range of from 0.25 to 8 hours, in particular in the range of from 0.5 to 8 hours, more preferable in the range of from 1 to 8 hours, more preferable in the range of from 2 to 8 hours, wherein the factor F(D1)=T(D1) x t(D1) is in the range of from 200 to 10000 K*h, preferably from 260 to 3700 K*h.The mixture (M1) may be further exposed to elevated temperature, for example a temperature in the range of from 210 to 240°C to ensure a full dissolution of all monomers, oligomers and soluble additives and fragments thereof before subjecting the mixture to step (a) of the process according to the present invention. The degree of depolymerization preferably has to be such, that a full solubility of the polymer fragments is achieved.According to step (i) or (i*) respectively, a mixture (M-0) is prepared from the polymeric material (PM) and the solvent composition (SC).The polymeric material (PM) comprises a polymer (P1), in particular 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 polymer (P1) or the polyamide (PA66) based polymer respectively in an amount of from 5 to 95 % by weight, more preferable in an amount of from 50 to 90 % by weight, in particular in an amount of from 60 to 80 % by weight based on the polymeric material.Regarding the polymeric material (PM), 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 polymer containing compositions are mechanically comminuted to an average particle size from 0.1 to 50 mm, preferably from 1 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 preformed granules, and also comprises shredded pieces.According to step (ii) or (ii*) respectively, mixture (M-0) is subjected to depolymerization conditions, preferably depolymerization conditions (D1) comprising a depolymerization temperatureT(D1) in the range of from 150 to 300°C and a depolymerization time t(D1) in the range of from 0.5 to 8 hours, wherein the factor F(D1)=T(D1) x t(D1) is in the range of from 200 to 10000 K*h, preferably from 260 to 3700 K*h obtaining a mixture (M1) comprising the solvent composition (SC), soluble oligomers and optionally monomers of the polymer (P1), filler (F1), and insoluble residues.Suitable methods and conditions for the depolymerization are in principle known to the person skilled in the art. Suitable depolymerization conditions (D1) may be chosen in wide ranges depending on the chemical nature of the polymer (P1). Suitable is for example a temperature T(D1) in the range of from 150 to 300°C, preferably 200 to 280°C. The depolymerization time t(D1) may preferably be in the range of from 0.25 to 8 hours, preferably in the range of from 0.5 to 8 hours, in particular from 1 to 4 hours. The factor F(D1)=T(D1) x t(D1) is in the range of from 200 to 10000 K*h. In particular for polyamide based polymers, the depolymerization may for example be carried out at a pH in the range of from 6.0 to 8.0. It has been found that the specific conditions for the treatment according to (c) allow to achieve depolymerization yielding soluble oligomers of the polyamide based polymer without negative effect on the filler (F1).According to step (b), the filler (F1), and insoluble residues are separated from mixture (M1) obtaining mixture (M-2) comprising the filler (F1) and insoluble residues, and mixture (M-3) comprising the solvent composition (SC) and soluble oligomers and optionally monomers of the polymer (P1).It has been found that separation using filtration at a pressure in the range of from 1 to 55 bar, preferably using filters having a pore size in the range of from 2 to 100 pm is particularly suitable for the separation according to step (b). According to a further embodiment, the present invention is also directed to the process as disclosed above, wherein the filtration is carried out at a pressure in the range of from 1 to 100 bar, preferably with a differential pressure in the range of from 1 to 30 bar. According to a further embodiment, the present invention is also directed to the process as disclosed above, wherein the separation according to step (b) is carried out using filters having a pore size in the range of from 2 to 100 pm.Step (b) may also comprise further washing steps, in particular washing with the solvent composition (SC).In step (b), mixture (M-2) comprising the filler (F1) and insoluble residues, and mixture (M-3) comprising the solvent composition (SC) and soluble oligomers and optionally monomers of the polymer (P1) are obtained.Mixture (M-2) may be further treated according to the present invention, in particular to separate the filler (F1) from insoluble residues. Suitable treatment steps might for example include washing steps. Organic residues might also be removed by thermal treatment.According to the present invention, it is also possible to treat mixture (M-3) to obtain the monomers and / or oligomers of the polymer (P1).For example for a polyamide (PA66) based polymer, it is possible to remove the solvent composition (SC) partially or completely to recover the monomers and / or oligomers of the polyamide (PA66) based polymer. The mixture (M-3) or the treated mixture may also be used for the preparation of polyamides. Suitable conditions for the polymerization are in principle known and are for example disclosed in US4313870, US9534083 or 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). Mixture (M-3) may for example be used together with further monomers. Catalysts and suitable additives may be added.It is also possible according to the present invention to subject mixture (M-3) to a further depolymerization step. It is for example possible to expose the mixture to alkaline conditions to achieve depolymerization of the oligomers. 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 is also directed to the process as disclosed above, wherein the process further comprises(c) subjecting mixture (M-3) to depolymerization conditions (D2) suitable to depolymerize the polyamide (PA66) based polymer and oligomers obtaining mixture (M-4) comprising the solvent composition (SC), soluble monomers of the polyamide (PA66) based polymer and optionally insoluble monomers of the polyamide (PA66) based polymer;(d) optionally separating the monomers obtained in step (c).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°Cor 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 200 to 250°C, more preferably 210 to 230°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 for example disclosed in DE 4219756. Suitable methods include for example electrochemical treatments.According to a further embodiment, the present invention is also directed to the 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(D1) in the range of from 5 to 360 minutes in the presence of a base, wherein the factor F(D1)=T(D1) x t(D1) 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.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 as alkali metal hydroxides or earth alkali metal hydroxides, for example sodium 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.Typically, soluble and insoluble monomers are separated according to step (d). Suitable methods are in principle known and may include filtration or centrifugation. The separation step may also be combined with further washing steps or neutralization steps to obtain adipic acid or a salt thereof. Suitable conditions for the recovery of the monomers are in principle known.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 (PA66), in particular subjecting the mixture (M-3) and / or mixture (M-4) to polyamide (PA66) polymerization conditions, obtaining a recycled polyamide 66.According to a further embodiment, the present invention is also directed to the process as disclosed above, wherein the process further comprises(c*) subjecting mixture (M-3) to polymerization conditions suitable to prepare a polymer, in particular a polyamide (PA66) based polymer, obtaining a recycled polymer, in particular a recycled polyamide (PA66).According to another embodiment, the present invention is also directed to the process as disclosed above, wherein the process further comprises(d*) subjecting mixture (M-4) or the monomers obtained in step (e) to polymerization conditions suitable to prepare a polymer, in particular a polyamide (PA66) based polymer, obtaining a recycled polymer, in particular a recycled polyamide (PA66).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 or oligomers, obtainable or obtained by a process as disclosed above, for preparing polyamide (PA66).In the context of the present invention, it is preferable to reuse the filler (F1). 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 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.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 inventiontherefore 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; or vi) aqueous polymer dispersion, preferably polyurethane or polyurethane - poly(meth)acry- late hybrid polymer dispersion, emulsion, binder for paper and fiber coatings, UV-curableacrylic 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 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 polymer 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 embodiment 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 / orforming, 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. (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 / 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, alkox- ylated 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 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 nonphosphate 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 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, Canthaxan- thin, 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 notlimited 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 polyvinylpyrroli- done-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 dispersions), aqueous dispersion(s) comprising composite particles, acrylate alkyd hybrid dispersions), 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 ReferenceRF1. 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 produces) 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 more detail 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”, 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”, asused 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 embodiments of the present invention.1 . Process for treating a mixture (M1) comprising a solvent composition (SC) comprising a polar solvent (S), soluble oligomers and optionally monomers of a polymer (P1 ), filler (F1), and optionally further insoluble residues, comprising(a) providing mixture (M1);(b) separating the filler (F1) and insoluble residues from mixture (M1) obtaining mixture (M-2) comprising the filler (F1) and insoluble residues, and mixture (M-3) comprising the solvent composition (SC) and soluble oligomers and optionally monomers of the polymer (P1),wherein step (b) is carried out by filtration at a pressure below 55 bar and a temperature in the range of from 150 to 270°C or by sedimentation or centrifugation, preferably by filtration at a pressure below 55 bar and a temperature in the range of from 150 to 270°C .2. The process according to embodiment 1, wherein mixture (M1) comprises the solvent composition (SC), soluble oligomers and optionally monomers of the polymer (P1) and the filler (F1) in a ratio of 65 to 80 : 25 to 30 : 10 to 15 % by weight.3. The process according to embodiment 1 or 2, wherein the vapor pressure of the solvent used is below 55 bar.4. The process according to any one of embodiments 1 to 3, wherein the solvent (S) is water.5. The process according to any one of embodiments 1 to 4, wherein the polymer (P1) is polyamide PA66.6. The process according to any one of embodiments 1 to 5, wherein mixture (M1) is obtained by a process comprising at least partial depolymerization of a polymeric material (PM) comprising a polymer (P1) and at least one filler (F1).7. The process according to any one of embodiments 1 to 6, wherein the separation according to step (b) is carried out using filters having a pore size in the range of from 2 to 100 pm.8. The process according to any one of embodiments 1 to 7, wherein the fibrous filler (F1) is 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.9. Fillers obtainable or obtained by a process according to any one of embodiments 1 to 8, 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.Use of the filler obtainable or obtained by a process according to any one of embodiments 1 to 8, for preparing a polymeric product. Process, preferably according to any one of the embodiments 1 to 8, 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 8 or a chemical material obtainable by or obtained by the process according to any one of embodiments 1 to 8 to obtain a product. Process according to embodiment 11 , 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; 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 Process according to any one of embodiments 11 or 12, 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 / orwherein the content of the polymeric material (PM) in the polymer 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 embodiment chain of custody models, preferably based on mass balance, preferably the International Sustainability and Carbon Certification (ISCC) standard. Process for treating a mixture (M1) comprising a solvent composition (SC) comprising a polar solvent (S), soluble oligomers and optionally monomers of a polymer (P1) selected from polyamide (PA66) and (PA6), filler (F1), and optionally further insoluble residues, comprising(a) providing mixture (M1);(b) separating the filler (F1) and insoluble residues from mixture (M1) obtaining mixture (M-2) comprising the filler (F1) and insoluble residues, and mixture (M-3) comprising the solvent composition (SC) and soluble oligomers and optionally monomers of the polymer (P1), wherein step (b) is carried out by filtration at a pressure below 55 bar and a temperature in the range of from 150 to 270°C or by sedimentation or centrifugation. The process according to embodiment 14, wherein mixture (M1) comprises the solvent composition (SC), soluble oligomers and optionally monomers of the polymer (P1) and the filler (F1) in a ratio of 65 to 80 : 25 to 30 : 10 to 15 % by weight. The process according to embodiment 14 or 15, wherein the vapor pressure of the solvent used is below 55 bar. The process according to any one of embodiments 14 to 16, wherein the solvent (S) is water. The process according to any one of embodiments 14 to 17, wherein mixture (M1) is obtained by a process comprising at least partial depolymerization of a polymeric material (PM) comprising a polymer (P1) selected from polyamide (PA66) and (PA6) and at least one filler (F1).19. The process according to any one of embodiments 14 to 18, wherein the separation according to step (b) is carried out using filters having a pore size in the range of from 2 to 100 pm.20. The process according to any one of embodiments 14 to 19, wherein the fibrous filler (F1) is 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.21. Fillers obtainable or obtained by a process according to any one of embodiments 14 to 20, 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.22. Use of the filler obtainable or obtained by a process according to any one of embodiments 14 to 20, for preparing a polymeric product.23. Process, preferably according to any one of embodiments 14 to 20, for preparing a product comprising adding a filler obtainable or obtained by a process according to any one of embodiments 14 to 20 to a polymer to obtain the product.24. Process, preferably according to any one of the embodiments 14 to 20, 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 14 to 20 or a chemical material obtainable by or obtained by the process according to any one of embodiments 14 to 20 to obtain a product.25. Process according to embodiment 24, 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; oriii) 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, 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 substrate26. Process according to any one of embodiments 24 or 25, 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 polymer 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 embodiment chain of custody models, preferably based on mass balance, preferably the International Sustainability and Carbon Certification (ISCC) standard.The following examples further illustrate the invention.ExamplesAccording to the method described, 40 g (0.1238mol) of the polymer is first weighed into the reaction vessel, of which 30 %, corresponding to 12 g, contains glass fibers, which are referred to below as GF NEG T249H. Then 77 g (4.277mol) of water is added to the reaction vessel. The amount of water is 35 molar equivalents of the polymer. After filling the reaction vessel, it is clamped into the autoclave head and sealed tightly with clamping jaws. Before the reaction begins, the reaction autoclave is flushed in three inerting cycles using nitrogen. The reaction is initiated by raising the target temperature of 250 °C for hydrolysis, using a temperature ramp of 45 min. After reaching the target temperature of 250 °C, the reaction vessel is pressurized with nitrogen to a total pressure of 100 bar.The hydrolysis then takes place for a period of 4 hours at 1000 revolutions per minute (RPM).After the 4-hour reaction time has elapsed, the reaction is cooled down to a predetermined target temperature of 230°C and rapidly cold-released by opening a valve through a 10 pM frit via a riser tube into a second autoclave. The temperature of the flash autoclave rises to approx. 60 °C. After cold expansion, the reaction autoclave is cooled down to 50 °C and the pressure is released via the exhaust line to allow the reaction autoclave to be opened. After cooling, the flash autoclave is depressurized with a valve to open it. The results of the depolymerization using different parameters regarding temperature and pressure are summarized in Table 1 The most energy-efficient and technically feasible optimization of the process was achieved at a temperature of 230°C and an internal pressure of 26 bar. The cooling time from the reaction temperature of 250°C to 230°C is about 10 minutes. The temperature drops from 230°C to 183°C in 1 minute and 30 seconds during the subsequent cold expansion or filtration in the second autoclave. The cooling time from 183°C to 50°C is then around 1 hour and 40 minutes be- fore the autoclave can be opened againTable 1 : results of the depolymerizationMeasurement 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. 3 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 PaLiterature citedWQ2024008847US5430068US4313870US9534083Ullmann's Encyclopedia of Industrial Chemistry, “Polyamides” Herzog, B., Kohan, M.I., Mes- temacher, S.A., Pagilagan, R.U., Redmond, K. and Sarbandi, R. (2024)DE 4219756

Claims

Claims1 . Process for treating a mixture (M1) comprising a solvent composition (SC) comprising a polar solvent (S), soluble oligomers and optionally monomers of a polymer (P1 ), filler (F1), and optionally further insoluble residues, comprising(a) providing mixture (M1);(b) separating the filler (F1) and insoluble residues from mixture (M1) obtaining mixture (M-2) comprising the filler (F1) and insoluble residues, and mixture (M-3) comprising the solvent composition (SC) and soluble oligomers and optionally monomers of the polymer (P1), wherein step (b) is carried out by filtration at a pressure below 55 bar and a temperature in the range of from 150 to 270°C or by sedimentation or centrifugation, preferably by filtration at a pressure below 55 bar and a temperature in the range of from 150 to 270°C. wherein the polymer (P1) is selected from the group consisting of polyamides.

2. The process according to claim 1 , wherein mixture (M1) comprises the solvent composition (SC), soluble oligomers and optionally monomers of the polymer (P1) and the filler (F1) in a ratio of 65 to 80 : 25 to 30 : 10 to 15 % by weight.

3. The process according to claim 1 or 2, wherein the vapor pressure of the solvent used is below 55 bar.

4. The process according to any one of claims 1 to 3, wherein the solvent (S) is water.

5. The process according to any one of claims 1 to 4, wherein the polymer (P1) is polyamide PA66.

6. The process according to any one of claims 1 to 5, wherein mixture (M1) is obtained by a process comprising at least partial depolymerization of a polymeric material (PM) comprising a polymer (P1) and at least one filler (F1).

7. The process according to any one of claims 1 to 6, wherein the separation according to step (b) is carried out using filters having a pore size in the range of from 2 to 100 pm.

8. The process according to any one of claims 1 to 7, wherein the filler (F1) is fibrous and is 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.

9. Fillers obtainable or obtained by a process according to any one of claims 1 to 8, 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.

10. Process, preferably according to any one of claims 1 to 8, for preparing a product comprising adding a filler obtainable or obtained by a process according to any one of claims 1 to 8 to a polymer to obtain the product.11 . Process, preferably according to any one of the claims 1 to 8, 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 8 or a chemical material obtainable by or obtained by the process according to any one of claims 1 to 8 to obtain a product.

12. Process according to claim 11 , 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; or vi) aqueous polymer dispersion, preferably polyurethane or polyurethane - poly(meth) acrylate hybrid polymer dispersion, emulsion, binder for paper and fibercoatings, 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 substrate13. Process according to any one of claims 11 or 12, 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 polymer 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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