Process for recycling of a colored polymeric material and extrusion product obtained therefrom

Abstract

A first aspect of the invention is related to a process for recycling of a colored polymeric material, which comprises (i) a polyalkylene terephthalate based polymer, and (ii) a colorant. A second aspect of the invention is related to an extrusion product, obtained or obtainable from the process of the first aspect. A third aspect relates to a process comprising the converting of a separated further polymer (iii) obtainable by or obtained by the process of the first aspect to obtain one or more monomer, polymer or polymer product.

Description

[0001] Process for recycling of a colored polymeric material and extrusion product obtained therefrom

[0002] A first aspect of the invention is related to a process for recycling of a colored polymeric material, which comprises (i) a polyalkylene terephthalate based polymer and (ii) a colorant, the process comprising (a) providing a colored polymeric material and a solvent system comprising gamma valerolactone; and (b.1) contacting the colored polymeric material provided in (a) with the solvent system provided in (a) under conditions allowing for colorant removal but not allowing for dissolution of the polyalkylene terephthalate based polymer, thereby obtaining a solvent system, which is enriched in colorant compared to the solvent system provided, and a polymeric material, which is depleted in colorant compared to the colored polymeric material provided in (a); and (b.2) extrusion of the polymeric material, which is depleted in colorant, obtained in (b.1), thereby obtaining an extrusion product, which is depleted in colorant compared to the colored polymeric material provided in (a); or

[0003] (b.1’) extrusion of the colored polymeric material provided in (a), thereby obtaining a colored extrusion product; and (b.2’) contacting the colored extrusion product obtained in (b.T) with the solvent system provided in (a) under conditions allowing for colorant removal but not allowing for dissolution of the polyalkylene terephthalate based polymer, thereby obtaining a solvent system, which is enriched in colorant compared to the solvent system provided, and an extrusion product, which is depleted in colorant compared to the colored polymeric material provided in (a).

[0004] A second aspect of the invention is related to an extrusion product, obtained or obtainable from the process of the first aspect. A third aspect relates to a process comprising the converting of a separated further polymer (iii) obtainable by or obtained by the process of the first aspect to obtain one or more monomer, polymer or polymer product.

[0005] The demand for polymeric materials has drastically increased over the last decades. However, the poor biodegradability has led to large amounts of plastic waste, which is in Europe usually incinerated thereby losing valuable materials and generating huge CO2 emissions. Even worse is landfill due to the poor biodegradability. Polymeric materials based on polyesters have been used extensively in the packaging sector, for example, in beverage packaging or food packaging. The vast majority of food and drink today is packaged within plastic bottles and containers, made from, for example, polyester materials comprising polyethylene terephthalate (PET). PET is also a main component of clothing nowadays. As these materials typically have poor biodegradability and are also still valuable products, it is desirable for these plastics to be recovered and recycled. Although recycling processes have been adopted to convert the waste materials into new production materials, there are still many problems associated with recycling and recovery of polymeric materials. Waste packaging often includes a mixture of different polymeric materials containing also, for example, colorants. The same applies also for textiles, which also comprise a high amount of colored polymeric materials. Therefore, in order to recycle polymeric materials, it is common to separate polymeric materials based on their color and / or their composition. However, this sorting process is labor intensive and / or requires the use of sorting machines.

[0006] Regarding removal of colorants, EP 2 784 110 A1 describes the removal of organic colorants from polyethylene terephthalate (PET) flakes from shredded PET bottles by extracting the PET- flakes with ethylene glycol at ambient pressure and at the boiling temperature of the ethylene glycol. US 10,876,240 B2 relates to decolorization of a dyed polyester with gaseous propylene glycol methyl ether. DE 2223466 A1 discloses a process for detaching substances from substrates at elevated temperature with a solvent, wherein the substrate is heated with the aid of the condensing vapor of a liquid, which is miscible with the solvent but does not dissolve the substrate and, subsequently, the heated substrate is treated with the solvent, whereby the substance is separated from the substrate.

[0007] While several processes are known for removing colorants from polyesters, these processes still suffer from disadvantages: Mechanical polymer recycling is difficult due to the colorants, thus a removal is highly desired. Until now, the only discoloration options proceed with the use of toxic solvents (such as NMP, DMI etc.). For mechanical recycling color plays an important role. Contamination with dyes and other colorants leads to decreased quality and makes re-use in high value applications impossible. Further drawbacks are the necessity to use toxic solvents and / or the need to use large quantities of solvents. Therefore, discoloration of the polymer (e.g. polyester) before or after mechanical recycling is highly desired.

[0008] The technical problem underlying the present invention was thus the provision of an economically process for recycling of a polyalkylene terephthalate based polymer, which overcomes these disadvantages, and which especially enables a precise removal of colorants, while using comparatively small quantities of solvent, and, if present, a removal of further polymers, and the recovery of color-depleted and non-degraded polyalkylene terephthalate based polymer, which then can be recycled mechanically and the variability of applications increases drastically. The process could also be performed vice versa. A first aspect of the invention is related to a process for recycling of a colored polymeric material, which comprises (i) a polyalkylene terephthalate based polymer, and (ii) a colorant, the process comprising

[0009] (a) providing a colored polymeric material and a solvent system; and

[0010] (b.1) contacting the colored polymeric material provided in (a) with the solvent system provided in (a) under conditions allowing for colorant removal but not allowing for dissolution of the polyalkylene terephthalate based polymer, thereby obtaining a solvent system, which is enriched in colorant compared to the solvent system provided, and a polymeric material, which is depleted in colorant compared to the colored polymeric material provided in (a); and

[0011] (b.2) extrusion of the polymeric material, which is depleted in colorant, obtained in (b.1), thereby obtaining an extrusion product, which is depleted in colorant compared to the colored polymeric material provided in (a); or

[0012] (b.T) extrusion of the colored polymeric material provided in (a), thereby obtaining a colored extrusion product; and

[0013] (b.2’) contacting the colored extrusion product obtained in (b.1’) with the solvent system provided in (a) under conditions allowing for colorant removal but not allowing for dissolution of the polyalkylene terephthalate based polymer, thereby obtaining a solvent system, which is enriched in colorant compared to the solvent system provided, and an extrusion product, which is depleted in colorant compared to the colored polymeric material provided in (a).

[0014] The sequence of steps (b.1), (b.2), (b.T) and (b.2’) is to be understood that initially, a colored polymeric material and a solvent are provided, wherein subsequently, either a color removal (step (b.1)) followed by extrusion (step (b.2)) is done, or, alternatively, extrusion is directly done with the colored material (step (b.1’)) followed by color removal (step (b.2.’)). In other words, it is possible to do the color removal before or after extrusion.

[0015] “Contacting under conditions allowing for colorant removal but not allowing for dissolution of the polyalkylene terephthalate based polymer” in step (b.1) as well as in (b.2’) comprises any kind of contact between the colored polymeric material or the colored extrusion product respectively and the solvent system, as long as the colorant are removed, while the polyalkylene terephthalate based polymer is maintained non-degraded. As described in more detail below, this comprises especially in some embodiments that the colored polymeric material or the colored extrusion product respectively is contacted with gaseous solvent system and / or re-condensed solvent system, while in some alternative embodiments, the colored polymeric material or the colored extrusion product respectively is at least partially immersed in the (liquid) solvent system. “Depleted in colorant” means that at least 50 weight-%, preferably at least 60 weight-%, more preferably at least 70 weight-%, more preferably at least 80 weight-%, more preferably at least 90 weight-%, more preferably at least 95 weight-% , of the colorant comprised in the colored polymeric material provided in (a), more preferably of the colorant comprised in the polyalkylene terephthalate based polymer contained therein, are removed from the polymeric material or the colored extrusion product respectively. “Enriched in colorant” means that at least 50 weight-%, preferably at least 60 weight-%, more preferably at least 70 weight-%, more preferably at least 80 weight-%, more preferably at least 90 weight-%, more preferably at least 95 weight-%, of the colorant comprised in the material provided in (a) more preferably of the colorant comprised in the polyalkylene terephthalate based polymer contained therein, are dissolved in the solvent system.

[0016] Colorant removal in (b) via gaseous stream

[0017] In some embodiments of the process, (b.1) and / or (b.2’) comprises

[0018] (b.i) providing the colored polymeric material or the colored extrusion product respectively in a first vessel and providing the solvent system in a second vessel; wherein first and second vessel are arranged spatially separated from each other but allowing a gaseous and fluid communication between each other;

[0019] (b.ii) forming a gaseous stream comprising at least parts of the solvent system, and removing the gaseous stream from the second vessel;

[0020] (b.iii) allowing the solvent system to separate in liquid form from the gaseous stream at a position outside the second vessel (also outside the first vessel), obtaining a solvent system in liquid form;

[0021] (b.iv) contacting the colored polymeric material or the colored extrusion product respectively in the first vessel with the solvent system in liquid form, which had been separated from the gaseous stream in (b.iii), thereby obtaining a solvent system, which is enriched in colorant compared to the solvent system provided in (a), and a polymeric material or an extrusion product respectively, which is depleted in colorant compared to the colored polymeric material provided in (a) and which comprises the polyalkylene terephthalate based polymer (i).

[0022] The expression “allowing a gaseous and fluid communication between each other” means that the colored polymeric material or the colored extrusion product respectively in the first vessel and the solvent system in the second vessel are not in direct contact with each other but that gases, gaseous phases and liquids can freely move between and around them. The expression “a gaseous stream comprising at least parts of the solvent system” is to be understood in that first, a part of the solvent system remains in the second vessel and second, in that the gaseous stream comprises at least a part of the solvent system, wherein the solvent system is present in the gaseous stream in liquid state or gaseous state or partly in liquid and partly in gaseous state.

[0023] A position outside the second vessel, which is also outside the first vessel, is any position outside these two vessels, wherein the only requirement is that the solvent system can separate in liquid form from the gaseous stream and a transfer back to the polymeric material or the extrusion product respectively in the first vessel by any suitable means is possible.

[0024] “Contacting” in these embodiments comprises especially that the colored polymeric material or the colored extrusion product respectively is contacted with gaseous solvent system and / or recondensed solvent system and / or separated solvent system as described in more detail in the following.

[0025] In some embodiments of the process, (b.ii) comprises

[0026] (b.ii.1 ) heating the solvent system to a temperature at least equal to or above the boiling temperature of the solvent system;

[0027] (b.ii.2) obtaining a gaseous stream comprising at least parts of the solvent system.

[0028] In some embodiments, the solvent system, due to the heating thereof, at least parts thereof, are transferred from liquid into gaseous state. A “boiling point” of a solvent system is, if two or more solvents are present in the solvent system, understood as the boiling range of the solvent system in case of a zeotropic mixture, or, in case of an azeotropic mixture, the boiling point of said azeotropic mixture. The boiling point of a solvent is generally understood as the boiling point of the solvent at the respective pressure and the boiling point of a solvent system is equally understood as the boiling point of the solvent system at the respective pressure. In some embodiments of the process, additionally an inert gas is applied, which forms parts of the gaseous stream comprising at least parts of the solvent system.

[0029] In some embodiments of the process, additionally an inert gas is applied, which forms parts of the gaseous stream comprising at least parts of the solvent system.

[0030] In some embodiments of the process, (b.ii) comprises (b.ii.T) heating the solvent system to a temperature T of at most 3K below the boiling temperature of the solvent system; so that a solvent system having elevated temperature is obtained;

[0031] (b.ii.2’) contacting the solvent system having elevated temperature with an inert gas, preferably passing inert gas through the solvent system having elevated temperature, so that a gaseous stream comprising at least parts of the solvent system is formed.

[0032] Heating the solvent system in (b.ii.T) is done to a temperature in the range of 30 °C, preferably 160°C, to at most 3K below the boiling temperature of the solvent system, wherein the 30 C or 160°C preferably apply when step (b.ii.T) is carried out at a pressure in the range of from 990 to 1030 hPa. In some embodiments of the process, at least one of (b.ii), (b.iii) and (b.iv), preferably (b.i), (b.ii), (b.iii) and (b.iv), is / are done at a pressure in the range of from 800 to 200,000 hPa; the same applies for all substeps described above and in the following. In some embodiments of the process, at least one of (b.ii), (b.iii) and (b.iv), preferably (b.i), (b.ii), (b.iii) and (b.iv), is / are done at a pressure in the range of from 800 to 1200 hPa; the same applies for all substeps described above and in the following. In some alternatively embodiments, at least one of at least one of (b.ii), (b.iii) and (b.iv), preferably (b.i), (b.ii), (b.iii) and (b.iv), is / are done at a pressure in the range of from 0.1 to 990 hPa, preferably in the range of from 1 to 990 hPa; the same applies for all substeps described above and in the following.

[0033] In some embodiments of the process, (b.iii) comprises

[0034] (b.iii.1) transferring the gaseous stream from the second vessel to a position outside the second vessel (also outside the first vessel);

[0035] (b.iii.2) allowing the parts of the solvent system comprised in the gaseous stream to separate in liquid form from the gaseous stream at the position outside the second vessel (also outside the first vessel), obtaining a solvent system in liquid form.

[0036] Separation of the solvent system in (b.iii.2) is done by any means suitable for separating a solvent system from a gaseous stream so that the solvent system is obtained in liquid form. For example, said separation is done by cooling the gaseous stream comprising at least parts of the solvent system, for example, by contacting with a surface of a means having a temperature lower than the temperature of the gaseous stream. In some embodiments, where the process is carried out in an extraction apparatus, such as a soxhlet extractor, the means having a temperature lower than the temperature of the solvent system is a condenser, preferably a condenser through which a cooling medium is conducted. Separation means, in case that the at least parts of the solvent system are at least partially in gaseous stream, condensation. In case that the at least parts of the solvent system are at least partially still in liquid state in gaseous stream, separation means detachment of these liquid parts from the gaseous stream. In some embodiments of the process, (b.iv) comprises

[0037] (b.iv.1) transferring the solvent system in liquid form obtained in (b.iii) to the colored polymeric material or the colored extrusion product respectively in the first vessel;

[0038] (b.iv.2) contacting the colored polymeric material or the colored extrusion product respectively in the first vessel with the solvent system in liquid form, thereby obtaining a solvent system, which is enriched in colorant compared to the solvent system provided in (a), and a polymeric material or an extrusion product respectively, which is depleted in colorant compared to the colored polymeric material provided in (a) and which comprises the polyalkylene terephthalate based polymer.

[0039] In some embodiments of the process, (b.iv) comprises

[0040] (b.iv.3) transferring the solvent system obtained in (b.iv.2) into the second vessel, which contains the solvent system provided in (a).

[0041] In some embodiments of the process, first vessel containing the polymeric material or the extrusion product respectively and second vessel containing the solvent system are arranged spatially separated from each other in that the first vessel containing the polymeric material or the extrusion product respectively is arranged above the second vessel containing the solvent system. The expression “arranged above the second vessel containing the solvent” means that the polymeric material or the extrusion product respectively is arranged at a position which is vertically higher located than the position of the upper edge of the solvent system in the second vessel. Preferably, there is no direct material contact between polymeric material or the extrusion product respectively and solvent system, i.e. the polymeric material or the extrusion product respectively neither touches the surface of the solvent system nor is the polymeric material or the extrusion product respectively to any percentage thereof immersed in the solvent system in the vessel. Apparatuses usable for carrying out the method are not limited. For example, in some embodiments an apparatus comparable to a soxhlet extractor is used, wherein the second vessel comprising the solvent system is comparable to a still pot and the first vessel comprising the polymeric material or the extrusion product respectively is comparable to the extraction sleeve, the first vessel in some embodiments being a device having one or more opening(s) such as a sieve. A sieve can have any conceivable shape such as being a planar sieve, a curved sieve etc., as long as the sieve is capable of holding the polymeric material or the extrusion product respectively (in solid state) but allowing passage of liquids and gases through its openings.

[0042] In some embodiments of the process, (b.iv) or (b.iv.2) respectively comprises contacting the colored polymeric material or the colored extrusion product respectively with the solvent system in liquid form of (b.iii) or (b.iii.2) respectively in that the solvent system in liquid form drops onto the colored polymeric material or the colored extrusion product respectively.

[0043] In some embodiments of the process, (b.iv.3) comprises transferring the solvent system, which is enriched in colorant compared to the solvent system provided in (a), from the first to the second vessel in that the solvent system in liquid form drops from the first vessel (back) into the second vessel.

[0044] In some embodiments, the process comprises:

[0045] (b.i) providing the colored polymeric material or the colored extrusion product respectively in a first vessel and providing the solvent system in a second vessel; wherein first and second vessel are arranged spatially separated from each other in that the first vessel containing the colored polymeric material or the colored extrusion product respectively is arranged above the second vessel containing the solvent system and allowing a gaseous and fluid communication between each other (between first and second vessel);

[0046] (b.ii) forming a gaseous stream comprising at least parts of the solvent system, and removing the gaseous stream from the second vessel;

[0047] (b.iii.1) transferring the gaseous stream from the second vessel to a position outside the second vessel (also outside the first vessel);

[0048] (b.iii.2) allowing the parts of the solvent system comprised in the gaseous stream to separate in liquid form from the gaseous stream at the position outside the second vessel (also outside the first vessel), preferably at a position above the first vessel, wherein said separation is preferably done by cooling the gaseous stream comprising at least parts of the solvent system, more preferably by contacting the gaseous stream at the position above the first vessel with a surface of a means having a temperature lower than the temperature of the gaseous stream; thereby obtaining a solvent system in liquid form;

[0049] (b.iv.1) transferring the solvent system in liquid form obtained in (b.iii.2) to the colored polymeric material or the colored extrusion product respectively in the first vessel in that the solvent system in liquid form drops from the position above the first vessel onto the colored polymeric material or the colored extrusion product respectively, which is in the first vessel;

[0050] (b.iv.2) contacting the colored polymeric material or the colored extrusion product respectively in the first vessel with the solvent system in liquid form, thereby obtaining a solvent system, which is enriched in colorant compared to the solvent system provided in (a), and a polymeric material or an extrusion product respectively, which is depleted in colorant compared to the colored polymeric material or the colored extrusion product respectively provided in (a) and which comprises the polyalkylene terephthalate based polymer; and preferably

[0051] (b.iv.3) transferring the solvent system obtained in (b.iv.2) into the second vessel, which contains the solvent system provided in (a)l, preferably in that the solvent system, which is enriched in colorant compared to the solvent system provided in (a), in liquid form drops from the first vessel (back) into the second vessel.

[0052] For these embodiments, all preferred options described above with respect to (b.ii.1), (b.ii.2), (b.ii.1 ’), (b.ii.2’) apply as well.

[0053] In some embodiments of the process, the inert gas is selected from the group consisting of argon, helium, neon, nitrogen and mixtures of two or more of these inert gases, preferably comprises at least nitrogen, more preferably the inert gas is nitrogen.

[0054] In some embodiments of the process, the inert gas is conducted through the solvent system and has a flow rate in the range of from 1 to 150 liter / h or is passed along the surface of the solvent system and has a flow rate of in the range of from 1 to 150 liter / h.

[0055] In some embodiments, the process further comprises

[0056] (b.v) removal of the solvent system obtained in (b.iv) or (b.iv.2), which is enriched in colorant from the polymeric material or the extrusion product respectively (i.e. also out of the first vessel) and recirculation into the second vessel comprising the solvent system, preferably by dropping it into the second vessel comprising the solvent system (allowing the solvent system obtained in (b.iv) or (b.iv.2) or to drop into the second vessel comprising the solvent system).

[0057] In some embodiments of the process, (b.ii), (b.iii) and (b.iv), preferably (b.ii), (b.iii), (b.iv) and (b.v), are carried out in continuous mode.

[0058] In some embodiments, the process further comprises

[0059] (b.vi) at least partial separation of polymeric material or the extrusion product respectively obtained in (b.iv) or (b.iv.2) from the solvent system, thereby obtaining a polymeric material or the extrusion product respectively which is depleted in colorant compared to the colored polymeric material provided in (a) and which comprises the polyalkylene terephthalate based polymer.

[0060] In some embodiments, the process further comprises

[0061] (b.vii)at least partial replacement of the polymeric material or the extrusion product respectively separated in (b.vi) by fresh colored polymeric material or fresh colored extrusion product respectively without replacement of the solvent system provided in (a), wherein the fresh colored polymeric material or the fresh colored extrusion product respectively comprises polyalkylene terephthalate based polymer and colorant, and repetition of step(s) (b.ii), (b.iii) and (b.iv), optionally (b.v); wherein steps (b.vi) and (b.vii) are preferably repeated at least one further time, preferably in the range of one to at least 10 further time(s) (batch mode); or wherein steps (b.vi) and (b.vii) are carried out continuously (purge mode).

[0062] In some embodiments of the process, in the range of from 1 to 50 weight-% of additional fresh solvent system, based on the total weight of the solvent system provided in (a) being 100 weight-% are added, wherein the addition is carried out discontinuously (batch mode) or continuously (purge mode).

[0063] Colorant removal in (b) by treatment in solution

[0064] In some alternatively embodiments of the process, (b.1) or (b.2’) comprises

[0065] (b.i’) contacting the colored polymeric material of (a) or the colored extrusion product of (b.2) respectively with a solvent system at a temperature T, which is < 170 °C, thereby obtaining a solvent system, which is enriched in colorant compared to the solvent system provided in (a), and a polymeric material or an extrusion product respectively, which is depleted in colorant compared to the colored polymeric material provided in (a);

[0066] (b.ii’) optionally separating the polymeric material or the extrusion product respectively, which is depleted in colorant.

[0067] The separation in (b.ii’) is done by methods and means known to the skilled person, especially solid-liquid separation methods such as filtration, for example, heated pressure filtration, sedimentation or centrifugation (see Handbuch der mechanischen Fest-Flussig-Trennung Taschen- buch - 29. April 2004 von Klaus Luckert (Herausgeber)). Colorants remain at least partially in the separated solvent system obtained in (b.ii’).

[0068] In these alternatively embodiments of the process, it is preferred that contacting in (b.i’) is done at a temperature which is in the range of from 10 to <170 °C, preferably in the range of from 110 to 165 °C, more preferably in the range of from 120 to 150 °C.

[0069] “Contacting” in step (b.i’) preferably means that the colored polymeric material or the colored extrusion product respectively is at least partially immersed in the solvent system. Preferably, the colored polymeric material or the colored extrusion product respectively is at least partially immersed in the (first or second) solvent system in that at least 60 %, more preferably at least 70 %, more preferably at least 80 %, more preferably at least 90 %, more preferably at least 95 %, more preferably at least 99 % of the colored polymeric material’s surface or the extrusion product’s surface respectively are in contact with the solvent system, based on the total surface being 100%.

[0070] In these alternatively embodiments of the process, (b.i’) is done at a pressure in the range of from 800 to 200,000 hPa.

[0071] In some embodiments of the process, at least (b.1) or (b.2’) is done in counter current mode. For example, if the contacting of step (b.1) or (b.2’) is done within a vessel, the solvent system enters the vessel from one direction (either side or top / bottom) and the colored polymeric material or the colored extrusion product respectively enters the vessel from an another, preferably an opposite, direction. In a preferred constellation wherein a vertically arranged vessel is used, the solvent system enters the vessel from the bottom and the colored polymeric material or the colored extrusion product respectively enters the vessel from the top. In some embodiments of the process, at least (b) is conducted under mechanical intermixing, wherein mechanical intermixing preferably comprises one or more methods selected from stirring, blending, and ultra sound.

[0072] Additional steps

[0073] Washing

[0074] In some embodiments of the process, (b.1) and / or (b.2’) comprises

[0075] (b.y) optionally washing the polymeric material or the extrusion product respectively separated in (b.vi) or in (b.ii’) with a washing solvent, thereby obtaining a washed polymeric material or a washed extrusion product respectively, which is depleted in colorant compared to the polymeric material provided in (a).

[0076] Drying

[0077] In some embodiments of the process, (b.1) and / or (b.2’) comprises

[0078] (b.z) drying the polymeric material or the extrusion product respectively separated in (b.vi) or in (b.ii’) and / or the washed polymeric material or the washed extrusion product respectively obtained in (b.y). Washing in optional step (b.y) is preferably done with a solvent system having features (s.1) or (s.1a), preferably (s.1) or (s.1a) and (s.2), more preferably (s.1) or (s.1a), (s.2) and (s.3), preferably with a solvent system comprising one or more of the solvent(s) of any one of the groups listed herein. Preferably, washing in optional step (b.y) is done with the same solvent system as used for color depletion. In some embodiments, washing is done with a solvent selected from the group consisting of methanol, ethanol, propanol, isopropanol, acetonitrile, ethyl acetate, acetone, water or a mixture of two or more of these solvents. In some embodiments, the washing in optional step (b.y) is done with a solvent selected from the group consisting of methanol, ethanol, propanol, isopropanol, acetonitrile, ethyl acetate, acetone, water, GVL, or a mixture of two or more of these solvents. Drying in step (b.z) is preferably done under one or more conditions selected from the group consisting of a pressure in the range of from 1 to 1013 mbar; a temperature in the range of from 50 to 210 °C, preferably in the range of from 60 to 180°C, more preferably in the range of from 80 to 160 °C; drying time in the range of from 30 minutes to 24 hours; drying in an atmosphere comprising nitrogen, preferably in an atmosphere having at least 90 volume-%, more preferably 95 volume-%, more preferably at least 98 volume-% nitrogen. Drying is done by one or more methods selected from the group consisting of contact drying, convection drying and radiation drying.

[0079] Solvent system

[0080] In some embodiments of the process, the solvent system comprises one or more solvent(s), wherein the solvent system

[0081] (s.1) has Hansen solubility parameters with respect to

[0082] - energy from dispersion forces between molecules (5DSS),

[0083] - energy from dipolar intermolecular force between molecules (5PSS) and

[0084] - energy from hydrogen bonds between molecules (5HSS), which fulfill equitation 1

[0085] (11)2> 4(6DSS-17.5)2+ (6Pss-7.5)2+ (5Hss-7.5)2[equitation 1],

[0086] Preferably, the solvent system comprises one or more solvent(s), wherein the solvent system (s.1 a) has Hansen solubility parameters with respect to energy from dispersion forces between molecules (5DSS), energy from dipolar intermolecular force between molecules (5PSS) and energy from hydrogen bonds between molecules (5HSS), which fulfill equitation 2 (8.8)2> 4(6Dss-20)2+ (5PSS-11.8)2+ (5Hss-4.5)2 [equitation 2],

[0087] Regarding the solvent system, any solvent system for which 4(6DSS-17.5)2+ (6Pss-7.5)2+ (5HSS- 7.5)2is larger than (11)2(i.e. 121), preferably any solvent system for which 4(5Dss-20)2+ (5PSS- 11.8)2+ (5Hss-4.5)2is larger than (8.8)2(i.e. 77.44) is not suited to dissolve the colorant, while leaving the polyalkylene terephthalate based polymer almost completely undissolved and nondegradated, and any solvent system for which 4(5DSS-17.5)2+ (5Pss-7.5)2+ (5Hss-7.5)2is smaller or equal to (11)2(i.e. 121), preferably any solvent system for which 4(5Dss-20)2+ (5PSS-11.8)2+ (5HSs-4.5)2is smaller or equal to (8.8)2(i.e. 77.44), is suitable for dissolving the colorant while leaving the polyalkylene terephthalate based polymer almost completely undissolved and nondegradated in the specific temperature range. In case of two or more solvents being part of the solvent system, i.e. n solvents with n being an integer with n>2 and i=1 ... n, the Hansen solubility parameters of the resulting mixture with respect to each of 5DSS, 5HSSand 5PSSare calculated, knowing the percentage part of each solvent in the solvent system, as the weighted arithmetic mean from 5DSj, 5HSj and 5PSj Of each of the n solvents S(i). The Hansen parameters are to be found in BIOVIA COSMOquick 2022.

[0088] Considering the three-dimensional form given by, for example, equitation 2 in the three-dimensional Hansen space, a sphere is formed which has its center at 5DC= 20, 5PC= 11.8 and 5HC= 4.5 and a radius r of 8.8. The doubling of the dispersion parameter value is required, according to Charles Hansen, for achieving a spherical form. A Hansen sphere, since there are no negative values possible for 5H, can also be considered as a dome, i.e. a half-sphere. The same principles apply for the three-dimensional form given by equitation 1 in the three-dimensional Hansen space.

[0089] In some embodiments of the process

[0090] (s.2) each solvent of the solvent system has a boiling point at 1013 hPa of at least 150 °C, preferably of at least 160 °C.

[0091] In some embodiments of the process

[0092] (s.3) solvents having a functional group selected from the group consisting of hydroxyl (OH), amino (NH2), carboxyl (COOH), and thiol (SH) are excluded.

[0093] In some embodiments of the process

[0094] (s.3a) solvents having a functional group selected from the group consisting of hydroxyl (OH), amino (NH2), secondary amine (-NH-), carboxyl (COOH), and thiol (SH) are excluded. In some embodiments of the process, at least 90 weight-%, preferably at least 95 weight-%, more preferably at least 98 weight-%, more preferably in the range of from 99 to 100 weight-%, of the solvent system consist of two or more solvent(s), based on the total weight of the solvent system being 100 weight-%.

[0095] In some embodiments of the process, at least 90 weight-%, preferably at least 95 weight-%, more preferably at least 98 weight-%, more preferably in the range of from 99 to 100 weight-%, of the solvent system consist of one solvent, which fulfills equitation 1 and / or 2, based on the total weight of the solvent system being 100 weight-%.

[0096] In some embodiments of the process, the one or more solvent(s) of the solvent system is / are selected from the group consisting of N,N-dimethylbenzamide, N,N-dimethylphenylacetamide, 1 ,4-benzoquinone, acetophenone, dimethyl terephthalate, 1 ,3,5-trimethoxybenzene, 2-phe- nylacetophenone, N-methylcaprolactam, methylbenzoate, methyl-4-methoxybenzoate, butylene carbonate, propylene-glycol-dibenzoate, N-ethylpyrrolidone, benzophenone, di-benzyl malo- nate, N-ethyl-caprolactam, methyl 2-(5-oxotetrahydrofuran-3-yl)acetate (FAME), propiophenone, N-methoxypropyl-pyrrolidone, 1 ,4-cyclohexanedione, cyclohexane-carbonate, N-methox- yethyl-pyrrolidone, N,N-diethylphenylacetamide, phenyl acetate, 1-(2-hydroxyethyl)pyrrolidin-2- one acetate (HEPAc), N,N-diethylbenzamide, isopropyl-benzoate, cyclohexyl phenyl ketone, phenylacetic acid ethylester, phenylacetat, N-methyl-morpholine, benzyl-propionate, benzylacetate, Neopentyl-glycol-dibenzoate, tetrahydrofurfuryl acetate, N-methyl-imidazole, benzyl butyrate, 2-pyrrolidone, 2-phenoxyethanol propionate, 2-phenoxyethyl isobutyrate, N,N-di- propylbenzamide, N,N-dimethylacetamide, N,N-diethylacetamide, dihydrolevoglucosenon (Gyrene), propylenecarbonate, caprolactone, dimethylisosorbide, N-butylpyrrolidone, t-butylpyrroli- done, methyl-1-methyl-5-oxopyrrolidine-3-carboxylate (MMOC), gamma-valerolactone (GVL), delta-valerolactone, gamma butyrolactone, methyl 5-(dimethylamino)-2-methyl-5-oxopentanoate (Rhodiasolv Polarclean), caprolactam, phen ethyl acetate, methyl phenylacetate, benzyl benzoate, N,N-dimethyllactamide (Agnique AMD 3L), and dimethyl sulfoxide (DMSO).

[0097] In some embodiments of the process, the one or more solvent(s) of the solvent system is / are selected from the group consisting of dihydrolevoglucosenon (Gyrene), propylenecarbonate, caprolactone, dimethylisosorbide, N-butylpyrrolidone, t-butylpyrrolidone, methyl- 1-methyl-5-ox- opyrrolidine-3-carboxylate (MMOC), gamma-valerolactone (GVL), delta-valerolactone, gamma butyrolactone, dimethylsulfoxide, methyl 5-(dimethylamino)-2-methyl-5-oxopentanoate (Rhodi- asolvOPolarclean), caprolactam, phenethyl acetate, methyl phenylacetate, benzyl benzoate, phenyl benzoate, methyl benzoate, propyl benzoate, and dimethyl sulfoxide (DMSO). In some embodiments of the process, the one or more solvent(s) of the solvent system is / are selected from the group consisting of propylenecarbonate, N-butylpyrrolidone, t-butyl pyrrolidone, methyl-1-methyl-5-oxopyrrolidine-3-carboxylate (MMOC), delta-valerolactone, gamma butyrolactone, methyl 5-(dimethylamino)-2-methyl-5-oxopentanoate (RhodiasolvOPolarclean), caprolactam, phenethyl acetate, methyl phenylacetate, benzyl benzoate, phenyl benzoate, methyl benzoate, propyl benzoate and GVL.

[0098] In some embodiments of the process, the one or more solvent(s) of the solvent system is / are selected from the group consisting of propylenecarbonate, N-butylpyrrolidone, t-butyl pyrrolidone, methyl-1-methyl-5-oxopyrrolidine-3-carboxylate (MMOC), delta-valerolactone, gamma butyrolactone, methyl 5-(dimethylamino)-2-methyl-5-oxopentanoate (RhodiasolvOPolarclean), caprolactam, phenethyl acetate, methyl phenylacetate, benzyl benzoate, phenyl benzoate, methyl benzoate, and propyl benzoate.

[0099] In some embodiments of the process, the one or more solvent(s) of the solvent system is / are selected from the group consisting of propylenecarbonate, N-butylpyrrolidone, t-butyl pyrrolidone, methyl-1-methyl-5-oxopyrrolidine-3-carboxylate (MMOC), methyl 5-(dimethylamino)-2-me- thyl-5-oxopentanoate (RhodiasolvOPolarclean), phenethyl acetate, and GVL.

[0100] In some embodiments of the process, the one or more solvent(s) of the solvent system is / are selected from the group consisting of propylenecarbonate, N-butylpyrrolidone, t-butyl pyrrolidone, methyl-1-methyl-5-oxopyrrolidine-3-carboxylate (MMOC), methyl 5-(dimethylamino)-2-me- thyl-5-oxopentanoate (RhodiasolvOPolarclean), and phenethyl acetate.

[0101] In some embodiments of the process, the one or more solvent(s) is / are selected from the group consisting of gamma valerolactone (GVL), N-butylpyrrolidone (NBP), propylenecarbonate, acetophenone, dimethyl sulfoxide (DMSO), dihydrolevoglucosenon (Cyrene), cyclohexanone and mixtures of two or more thereof. In some embodiments of the process, the one or more solvents) is / are selected from the group consisting of gamma valerolactone (GVL), N-butylpyrroli- done (NBP), propylenecarbonate, acetophenone, dimethyl sulfoxide (DMSO), dihydrolevoglucosenon (Cyrene) and mixtures of two or more thereof. In some embodiments of the process, the one or more solvent(s) is / are selected from the group consisting of gamma valerolactone (GVL), N-butylpyrrolidone (NBP), propylenecarbonate, acetophenone, dimethyl sulfoxide (DMSO) and mixtures of two or more thereof. In some embodiments of the process, the one or more solvent(s) is / are selected from the group consisting of gamma valerolactone (GVL), N-bu- tylpyrrolidone (NBP), propylenecarbonate, acetophenone and mixtures of two or more thereof. In some embodiments of the process, the one or more solvent(s) is / are selected from the group consisting of gamma valerolactone (GVL), N-butylpyrrolidone (NBP), acetophenone and mixtures of two or more thereof. In some embodiments of the process, the one or more solvent(s) is / are selected from the group consisting of gamma valerolactone (GVL), N-butylpyrrolidone (NBP) and mixtures of GVL and NBP.

[0102] In some embodiments of the process, the one or more solvent(s) is / are selected from the group consisting of N-butylpyrrolidone (NBP), propylenecarbonate, acetophenone, dimethyl sulfoxide (DMSO), dihydrolevoglucosenon (Gyrene), cyclohexanone and mixtures of two or more thereof. In some embodiments of the process, the one or more solvent(s) is / are selected from the group consisting of N-butylpyrrolidone (NBP), propylenecarbonate, acetophenone, dimethyl sulfoxide (DMSO), dihydrolevoglucosenon (Gyrene) and mixtures of two or more thereof. In some embodiments of the process, the one or more solvent(s) is / are selected from the group consisting of N- butylpyrrolidone (NBP), propylenecarbonate, acetophenone, dimethyl sulfoxide (DMSO) and mixtures of two or more thereof. In some embodiments of the process, the one or more solvents) is / are selected from the group consisting of N-butylpyrrolidone (NBP), propylenecarbonate, acetophenone and mixtures of two or more thereof. In some embodiments of the process, the one or more solvent(s) is / are selected from the group consisting of N-butylpyrrolidone (NBP), acetophenone and mixtures of N-butylpyrrolidone (NBP) and acetophenone.

[0103] In some embodiments of the process, the one or more solvent(s) comprise at least N-butylpyr- rolidone, preferably at least 90 weight-% of the one or more solvent(s), more preferably at least 95 weight-%, more preferably at least 98 weight-%, more preferably at least 99 weight-%, more preferably at least 99.5 weight-%, more preferably at least 99.9 weight-%, of the one or more solvent(s) are N-butylpyrrolidone, based on a total weight of the one or more solvent(s) being 100 weight-%, more preferably the one solvent is N-butylpyrrolidone. In some embodiments, contacting in (b.i’) is done at a temperature T, which may be in the range of from 10 to <170 °C wherein T preferablymay be in the range of from 140 to 160 °C, more preferably in the range of from 150 to 160 °C, or contacting in (b.i’) is done at a temperature T, which may be in the range of from 101 to 81 K below the boiling point of the of the N-butylpyrrolidone, preferably in the range of from 91 to 81 K below the boiling point of the of the N-butylpyrrolidone. The contacting in (b.i’), is preferably done at a pressure in the range of from 800 to 1200 hPa. Preferably, the process is run at autogenous pressure, wherein the autogenous pressure may be higher than the ambient pressure of the surrounding area caused by the steam pressure of N-butylpyrroli- done at the temperature T at which the process is run. The skilled person can determine and / or adjust said autogenous pressure according to the steam pressure curve of N-butylpyrrolidone at a certain temperature T. Steam pressure curves of N-butylpyrrolidone are known to a person skilled in the art. The autogenous pressure may be lowered by purging, e.g. by a purging valve, preferably to a pressure between ambient pressure and lower 2000 hPa, preferably between 1200 hPa and 1800 hPa. Autogenous pressure is the pressure caused by the production system itself in a closed system, e.g. a pressure in the range from 800 to 3000 hPa. In some embodiments of the process, the one or more solvent(s) comprise at least propylenecarbonate, preferably at least 90 weight-% of the one or more solvent(s), more preferably at least 95 weight-%, more preferably at least 98 weight-%, more preferably at least 99 weight-%, more preferably at least 99.5 weight-%, more preferably at least 99.9 weight-%, of the one or more solvent(s) are propylenecarbonate, based on a total weight of the one or more solvent(s) being 100 weight-%, more preferably the one solvent is propylenecarbonate. In some embodiments, contacting in (b.i’) is done at a temperature T, which may be in the range of from 10 to <170 °C wherein T preferably may be in the range of from 140 to 160 °C, more preferably in the range of from 150 to 160 °C, or contacting in (b.i’) is done at a temperature T, which may in the range of from 102 to 82 K below the boiling point of the of the propylenecarbonate, preferably in the range of from 92 to 82 K below the boiling point of the of the propylenecarbonate. The contacting in (b.i’) is preferably done at a pressure in the range of from 800 to 1200 hPa. Preferably, the process is run at autogenous pressure, wherein the autogenous pressure may be higher than the ambient pressure of the surrounding area caused by the steam pressure of propylenecarbonate at the temperature T at which the process is run. The skilled person can determine and / or adjust said autogenous pressure according to the steam pressure curve of propylenecarbonate at a certain temperature T. Steam pressure curves of propylenecarbonate are known to a person skilled in the art. The autogenous pressure may be lowered by purging, e.g. by a purging valve, preferably to a pressure between ambient pressure and lower 2000 hPa, preferably between 1200 hPa and 1800 hPa. Autogenous pressure is the pressure caused by the production system itself in a closed system, e.g. a pressure in the range from 800 to 3000 hPa.

[0104] In some embodiments of the process, the one or more solvent(s) comprise at least acetophenone, preferably at least 90 weight-% of the one or more solvent(s), more preferably at least 95 weight-%, more preferably at least 98 weight-%, more preferably at least 99 weight-%, more preferably at least 99.5 weight-%, more preferably at least 99.9 weight-%, of the one or more solvent(s) are acetophenone, based on a total weight of the one or more solvent(s) being 100 weight-%, more preferably the one solvent is acetophenone. In some embodiments, contacting in (b.i’) is done at a temperature T, which may be in the range of from 10 to <170 °C wherein T preferably may be in the range of from 140 to 160 °C, more preferably in the range of from 150 to 160 °C, or contacting in (b.i’) is done at a temperature T, which may be in the range of from 62 to 42 K below the boiling point of the of the acetophenone, preferably in the range of from 52 to 42 K below the boiling point of the of the acetophenone. The contacting in (b.i’) is preferably done at a pressure in the range of from 800 to 1200 hPa. Preferably, the process is run at autogenous pressure, wherein the autogenous pressure may be higher than the ambient pressure of the surrounding area caused by the steam pressure of acetophenone at the temperature T at which the process is run. The skilled person can determine and / or adjust said autogenous pressure according to the steam pressure curve of acetophenone at a certain temperature T. Steam pressure curves of acetophenone are known to a person skilled in the art. The autogenous pressure may be lowered by purging, e.g. by a purging valve, preferably to a pressure between ambient pressure and lower 2000 hPa, preferably between 1200 hPa and 1800 hPa. Autogenous pressure is the pressure caused by the production system itself in a closed system, e.g. a pressure in the range from 800 to 3000 hPa.

[0105] In some embodiments of the process, the one or more solvent(s) comprise at least dimethyl sulfoxide (DMSO), preferably at least 90 weight-% of the one or more solvent(s), more preferably at least 95 weight-%, more preferably at least 98 weight-%, more preferably at least 99 weight- %, more preferably at least 99.5 weight-%, more preferably at least 99.9 weight-%, of the one or more solvent(s) are DMSO, based on a total weight of the one or more solvent(s) being 100 weight-%, more preferably the one solvent is DMSO. In some embodiments, contacting in (b.i’) is done at a temperature T, which may be in the range of from 10 to <170 °C wherein T preferably may be in the range of from 140 to 160 °C, more preferably in the range of from 150 to 160 °C, or contacting in (b.i’) is done at a temperature T, which may be in the range of from 49 to 29 K below the boiling point of the of the DMSO, preferably in the range of from 39 to 29 K below the boiling point of the of the DMSO. The contacting in (b.i’) is preferably done at a pressure in the range of from 800 to 1200 hPa. Preferably, the process is run at autogenous pressure, wherein the autogenous pressure may be higher than the ambient pressure of the surrounding area caused by the steam pressure of DMSO at the temperature T at which the process is run. The skilled person can determine and / or adjust said autogenous pressure according to the steam pressure curve of DMSO at a certain temperature T. Steam pressure curves of DMSO are known to a person skilled in the art. The autogenous pressure may be lowered by purging, e.g. by a purging valve, preferably to a pressure between ambient pressure and lower 2000 hPa, preferably between 1200 hPa and 1800 hPa. Autogenous pressure is the pressure caused by the production system itself in a closed system, e.g. a pressure in the range from 800 to 3000 hPa.

[0106] In some embodiments of the process, the one or more solvent(s) comprise at least dihy- drolevoglucosenon (Gyrene), preferably at least 90 weight-% of the one or more solvent(s), more preferably at least 95 weight-%, more preferably at least 98 weight-%, more preferably at least 99 weight-%, more preferably at least 99.5 weight-%, more preferably at least 99.9 weight- %, of the one or more solvent(s) are Gyrene, based on a total weight of the one or more solvents) being 100 weight-%, more preferably the one solvent is Gyrene. In some embodiments, contacting in (b.i’) is done at a temperature T, which may be in the range of from 10 to <170 °C wherein T preferably may be in the range of from 140 to 160 °C, more preferably in the range of from 150 to 160 °C, or contacting in (b.i’) is done at a temperature T, which may be in the range of from 86 to 66 K below the boiling point of the of the Cyrene, preferably in the range of from 76 to 66 K below the boiling point of the of the Cyrene. The contacting in (b.i’) is preferably done at a pressure in the range of from 800 to 1200 hPa. Preferably, the process is run at autogenous pressure, wherein the autogenous pressure may be higher than the ambient pressure of the surrounding area caused by the steam pressure of Cyrene at the temperature T at which the process is run. The skilled person can determine and / or adjust said autogenous pressure according to the steam pressure curve of Cyrene at a certain temperature T. Steam pressure curves of Cyrene are known to a person skilled in the art. The autogenous pressure may be lowered by purging, e.g. by a purging valve, preferably to a pressure between ambient pressure and lower 2000 hPa, preferably between 1200 hPa and 1800 hPa. Autogenous pressure is the pressure caused by the production system itself in a closed system, e.g. a pressure in the range from 800 to 3000 hPa.

[0107] In some embodiments of the process, the one or more solvent(s) comprise at least cyclohexanone, preferably at least 90 weight-% of the one or more solvent(s), more preferably at least 95 weight-%, more preferably at least 98 weight-%, more preferably at least 99 weight-%, more preferably at least 99.5 weight-%, more preferably at least 99.9 weight-%, of the one or more solvent(s) are cyclohexanone, based on a total weight of the one or more solvent(s) being 100 weight-%, more preferably the one solvent is cyclohexanone. In some embodiments, contacting in (b.i’) is done at a temperature T, which may be in the range of from 10 to <170 °C wherein T preferably may be in the range of from 140 to 155 °C, more preferably in the range of from 145 to 150 °C, or contacting in (b.i’) is done at a temperature T, which may be in the range of from 16 to 1 K below the boiling point of the of the cyclohexanone, preferably in the range of from 11 to 6 K below the boiling point of the of the cyclohexanone. The contacting in (b.i’) is preferably done at a pressure in the range of from 800 to 1200 hPa. Preferably, the process is run at autogenous pressure, wherein the autogenous pressure may be higher than the ambient pressure of the surrounding area caused by the steam pressure of cyclohexanone at the temperature T at which the process is run. The skilled person can determine and / or adjust said autogenous pressure according to the steam pressure curve of cyclohexanone at a certain temperature T. Steam pressure curves of cyclohexanone are known to a person skilled in the art. The autogenous pressure may be lowered by purging, e.g. by a purging valve, preferably to a pressure between ambient pressure and lower 2000 hPa, preferably between 1200 hPa and 1800 hPa. Autogenous pressure is the pressure caused by the production system itself in a closed system, e.g. a pressure in the range from 800 to 3000 hPa.

[0108] In some embodiments of the process, ethyl benzoate and butyl benzoate are excluded as solvents). In some embodiments of the process, the solvent system comprises GVL, wherein preferably at least 90 weight-%, more preferably at least 95 weight-%, more preferably at least 98 weight-%, more preferably in the range of from 99 to 100 weight-%, based on the total weight of the solvent system being 100 weight-%, of the solvent system of the solvent system consist of GVL, more preferably the one solvent is GVL. In some embodiments, contacting in (b.i’) is done at a temperature T, which may be in the range of from 10 to <170 °C wherein T preferably may be in the range of from 140 to 160 °C, more preferably in the range of from 150 to 160 °C, or contacting in (b.i’) is done at a temperature T, which may be in the range of from 65 to 45 K below the boiling point of the of the GVL, preferably in the range of from 55 to 45 K below the boiling point of the of the GVL. The contacting in (b.i’) is preferably done at a pressure in the range of from 800 to 1200 hPa. Preferably, the process is run at autogenous pressure, wherein the autogenous pressure may be higher than the ambient pressure of the surrounding area caused by the steam pressure of GVL at the temperature T at which the process is run. The skilled person can determine and / or adjust said autogenous pressure according to the steam pressure curve of GVL at a certain temperature T. Steam pressure curves of GVL are known to a person skilled in the art. The autogenous pressure may be lowered by purging, e.g. by a purging valve, preferably to a pressure between ambient pressure and lower 2000 hPa, preferably between 1200 hPa and 1800 hPa. Autogenous pressure is the pressure caused by the production system itself in a closed system, e.g. a pressure in the range from 800 to 3000 hPa.

[0109] Preferably, the polyalkylene terephthalate based polymer of the polymeric material obtained in (b.1) and / or of the extrusion product, which is depleted in colorant, obtained in (b.2) or (b.2’) has a number average molecular weight Mn, which is greater or at least equal to the Mn of the polyalkylene terephthalate based polymer comprised in the polymeric material provided in (a). Preferably, the polyalkylene terephthalate based polymer of the polymeric material obtained in (b.1) or of the extrusion product, which is depleted in colorant obtained in (b.2) or (b.2’) has a dispersity Mw / Mn (Mass average molecular weight Mw divided by number average molecular weight Mn) in the range of from 70 to 95%, preferably in the range of from 75 to 90 % of the dispersity Mw / Mn of the polyalkylene terephthalate based polymer comprised in the polymeric material.

[0110] Extrusion in (b.2) or (b.1

[0111] In some embodiments of the process, the extrusion in (b.2) or (b.T) is melt extrusion.

[0112] In some embodiments of the process, the extrusion in (b.2) comprises

[0113] (b.2.1) extrusion of melted polymeric material, which is depleted in colorant, obtained in (b.1), thereby obtaining an extrudate; (b.2.2) pelletizing the extrudate obtained in (b.2.1), thereby obtaining an extrusion product, which is depleted in colorant compared to the colored polymeric material provided in (a); and / or wherein the extrusion in (b.T) comprises

[0114] (b.1’.1) extrusion of melted colored polymeric material provided in (a), thereby obtaining a colored extrudate;

[0115] (b.1’.2) pelletizing the colored extrudate obtained in (b.1’.1), thereby obtaining a colored extrusion product.

[0116] “Extrusion” refers to a manufacturing process that involves forcing a molten polymer material through a shaped die to create a continuous profile or shape. The extrusion product obtained in (b.2) or (b.2.2) and / or the colored extrusion product obtained in (b.T) or (b.1’.2), is preferably an extrudate having a cross-sectional profile, wherein the cross-sectional profile is circular, hexagonal, rectangular, quadratic, triangular, oval, a star-shaped polygon, or cloverleaf-shaped, preferably circular, hexagonal, rectangular, quadratic, triangular, oval, a star-shaped polygon having 3, 4, 5, 6, 7, or 8 tips, a trilobe or a quadrilobe, more preferably circular, hexagonal, rectangular, quadratic, triangular, oval, a star-shaped polygon having 3 or 4 tips, a trilobe or a quadrilobe, more preferably the extrudate has a circular cross-sectional profile.

[0117] The melt polymeric material used in (b.2.1) or of colored polymeric material used in (b.1’.1) may comprise one or more additive(s), preferably selected from the group consisting of antioxidant, heat stabilizer, light stabilizer, chain extender, and mixtures of two or more thereof.

[0118] In some embodiments, the process includes de-gassing, wherein de-gassing comprises strand de-gassing as well as de-gassing of the melt, preferably in the extruder, preferably between (b.1) and (b.2) and / or during extrusion in (b.2), (b.T), (b.2.1) or (b.1’.1), and Solid State Polymerization (SSP). SSP enables to increase molecular weight I lift intrinsic viscosity (IV). Degassing preferably means application of thermal energy, preferably heat, and simultaneously reduction of the partial pressure of the solvent system by, for example, reduction of pressure (vacuum) or application of an inert gas.

[0119] “Pelletizing” is the process of compressing or molding a material into the shape of a pellet. Pelletizing can be done as known in the art, for example, by pelletizing under water or by strand granulation.

[0120] In some embodiments of the process, the extrusion product, which is depleted in colorant compared to the colored polymeric material provided in (a) obtained in (b.2) or (b.2’) respectively, is further processed to give a polymer product, preferably by melt-spinning extrusion to give a fiber.

[0121] In some embodiments of the process, the extrusion product, which is depleted in colorant compared to the colored polymeric material provided in (a) obtained in (b.2) or (b.2’) respectively, is further processed to give a polymer product, preferably by melt-blow extrusion, wherein the melt-blow extrusion is more preferably an injection stretch blow molding or an extrusion blow molding, to give a polymer product, preferably a three-dimensional hollow body, more preferably a bottle.

[0122] Polyalkylene terephthalate based polymer

[0123] The “polyalkylene terephthalate based polymer” consists of either oxyethylen units or oxy- butylen units and oxyterephthaloyl units, wherein in case of oxyethylen units, in the range of from 0 to 5 mol-% of the oxyterephthaloyl units are replaced by oxyisophthaloyl units and / or in the range of from 0 to 49 mol-% of the oxyethylen units are replaced by oxymethylene cyclohexylene methylene units.

[0124] Preferably, the polyalkylene terephthalate based polymer is selected from the group consisting of PET (polyethylene terephthalate), PETG (poly(ethylene terephthalate-co-1 ,4-cyclohexylene dimethylene terephthalate)), PETI (poly(ethylene terephthalate-co-isophthalate)), PBT (polybutylene terephthalate), and mixtures of two or three of these polymers, or the polyalkylene terephthalate based polymer is selected from the group consisting of PET (polyethylene terephthalate), PETI (poly(ethylene terephthalate-co-isophthalate)), PBT (polybutylene terephthalate), and mixtures of two or three of these polymers. In some embodiments, the polyalkylene terephthalate based polymer comprises at least 80 weight-%, more preferably at least 85 weight-%, more preferably at least 90 weight-%, more preferably at least 95 weight-%, more preferably at least 96 weight-%, more preferably at least 97 weight-%, of PET based on the total weight of the polyalkylene terephthalate based polymer being 100 weight-% and / or, preferably and, at the outmost 20 weight-%, more preferably at the outmost 15 weight-%, more preferably at the outmost 10 weight-%, more preferably at the outmost 5 weight-%, more preferably at the outmost 4 weight-%, more preferably at the outmost 3 weight-%, more preferably at the outmost 2 weight- %, more preferably at the outmost 1 weight-%, of PETI, based on the total weight of the polyalkylene terephthalate based polymer being 100 weight-%.

[0125] In some embodiments, the “polyalkylene terephthalate based polymer” comprises or is a polyester based on 1 ,4-butanediol or 1 ,2-ethandiol, more preferably a polyester selected from the group consisting of a polymer based on 1 ,4-butanediol and terephthalic acid (polybutylene terephthalate, PBT), a polymer based on 1 ,2-ethanediol and terephthalic acid (polyethylene terephthalate, PET), a copolymer of 1 ,4-butanediol, adipic acid and terephthalic acid (polybutyl- enadipat-terephthalat, PBAT), a polymer of 1 ,2-ethanediol and 2,5-furandicarboxylic acid (polyethylene furanoate, PEF) and mixtures of two or more of these (co)polymers.

[0126] More preferably, the “polyalkylene terephthalate based polymer” comprises at least PET and / or PBT, more preferably the polyester is PET or PBT or a mixture of PET and PBT.

[0127] More preferably the polyalkylene terephthalate based polymer comprises or is PET.

[0128] In some embodiments of the process, at least 90 weight-%, preferably at least 95 weight-%, more preferably at least 96 weight-%, more preferably at least 97 weight-%, more preferably at least 98 weight-%, of the colored polymeric material provided in (a) consist of polyalkylene terephthalate based polymer (i) and colorant (ii), each based on the total weight of the polymeric material provided in (a) being 100 weight-%.

[0129] In some embodiments, the polymeric material derives from textiles such as clothing, wherein the textiles are preferably subjected to a sorting process before the polymeric material is subjected to a method according to the present invention. A sorting process preferably comprises one or more NIR sorting steps, wherein textiles are analysed by near-infrared (NIR) spectroscopy and, based on the analytic result, sorted based on their composition. Thus, the polymeric material subjected to the method according to the present invention is preferably a pre-sorted, more preferably an NIR presorted, textile. The textile has preferably underwent a size reduction, more preferably a cutting and / or shredding step. Thus, the polymeric material subjected to the method according to the present invention is preferably a pre-sorted, more preferably an NIR presorted, and / or size reduced, more preferably cutted and / or shredded, textile. In some embodiments, the polymeric material subjected to the method according to the present invention is preferably a pre-sorted, more preferably an NIR presorted, and / or size reduced, more preferably cutted and / or shredded, textile, which has a content of PA6 of less than 10 weight-%, more preferably of less than 5 weight-%, more preferably of less than 4 weight-%, more preferably of less than 3 weight-%, more preferably of less than 2 weight-%, more preferably of less than 1 weight-%, based on the total weight of the polymeric material being 100 weight-%. Lowering the content of PA in the textile may provide an improved quality of the obtained polyester, in particular of the polyalkylene terephthalate based polymer. Further polymer (Hi)

[0130] In some embodiments of the process, when the step sequence (b.1), (b.2) is applied, i.e. color is removed before extrusion, the polymeric material may contain a further polymer (iii), which is preferably an elastic fiber - said elastic fiber is removed together with the colorant in step (b.1). The elastic fiber comprises, preferably consists of one or more polyurethane based elastic fi- ber(s)and / or one or more polyester based elastic fiber(s), more preferably the elastic fiber comprises, preferably consists of one or more polyurethane based elastic fiber(s), wherein more preferably at least 40 weight-%, more preferably at least 45 weight-%, more preferably at least 50 weight-%, more preferably at least 55 weight-%, more preferably at least 60 weight-%, more preferably at least 65 weight-%, more preferably at least 70 weight-%, more preferably at least 75 weight-%, more preferably at least 80 weight-%, more preferably at least 85 weight-%, more preferably at least 90 weight-%, more preferably at least 95 weight-%, more preferably at least 99.9 weight-%, of the elastic fiber are polyurethane based elastic fiber(s), each based on the total weight of the elastic fiber being 100 weight-%.

[0131] The colored polymeric material comprises (i) a polyalkylene terephthalate based polymer, and (ii) a colorant, and optionally a further polymer (iii), which is preferably an elastic fiber, which comprises, preferably consists of one or more polyurethane based elastic fiber(s)and / or one or more polyester based elastic fiber(s), more preferably the elastic fiber comprises, preferably consists of one or more polyurethane based elastic fiber(s), wherein more preferably at least 40 weight-%, more preferably at least 45 weight-%, more preferably at least 50 weight-%, more preferably at least 55 weight-%, more preferably at least 60 weight-%, more preferably at least 65 weight-%, more preferably at least 70 weight-%, more preferably at least 75 weight-%, more preferably at least 80 weight-%, more preferably at least 85 weight-%, more preferably at least 90 weight-%, more preferably at least 95 weight-%, more preferably at least 99.9 weight-%, of the elastic fiber are polyurethane based elastic fiber(s), each based on the total weight of the elastic fiber being 100 weight-%.

[0132] Optionally, at least 90 weight-%, preferably at least 95 weight-%, more preferably at least 97 weight-% of the colored polymeric material consist of (i) polyalkylene terephthalate based polymer, (ii) colorant and optionally further polymer (iii), based on the total weight of the colored polymeric material being 100 weight-%, wherein the further polymer optionally is an elastic fiber, which comprises, preferably consists of one or more polyurethane based elastic fiber(s)and / or one or more polyester based elastic fiber(s), more preferably the elastic fiber comprises, preferably consists of one or more polyurethane based elastic fiber(s), wherein more preferably at least 40 weight-%, more preferably at least 45 weight-%, more preferably at least 50 weight-%, more preferably at least 55 weight-%, more preferably at least 60 weight-%, more preferably at least 65 weight-%, more preferably at least 70 weight-%, more preferably at least 75 weight-%, more preferably at least 80 weight-%, more preferably at least 85 weight-%, more preferably at least 90 weight-%, more preferably at least 95 weight-%, more preferably at least 99.9 weight- %, of the elastic fiber are polyurethane based elastic fiber(s), each based on the total weight of the elastic fiber being 100 weight-%. Optionally, less than 10 weight-%, preferably less than 5 weight-%, more preferably less than 3 weight-% of the colored polymeric material are (iv) an additional polymer, based on the total weight of the colored polymeric material being 100 weight- %, wherein the additional polymer optionally is selected from the group consisting of poly propylene (PP), polyethylene (PE), polyamide (PA), preferably PA6 and / or PA66, natural polymer, preferably cotton, viscose, linen and mixtures of two or more thereof. Optionally, at least 90 weight-%, preferably at least 95 weight-%, more preferably at least 97 weight-% of the colored polymeric material consist of (i) polyalkylene terephthalate based polymer and (ii) colorant, based on the total weight of the colored polymeric material being 100 weight-%. In some embodiments, less than 10 weight-%, preferably less than 5 weight-%, more preferably less than 3 weight-% of the colored polymeric material are (iii) further polymer and (iv) additional polymer, based on the total weight of the colored polymeric material being 100 weight-%.

[0133] In some embodiments, the solvent system obtained in (b.1), which is enriched in colorant compared to the solvent system provided, is also enriched in further polymer (iii).

[0134] Preferably, said further polymer (iii) is then separated from the solvent system and preferably put to a further use. Separation of the further polymer, if present in the polymeric material, is done by, for example, distillation, wherein the solvent system is removed and the remaining residue is put to a further use.

[0135] In some embodiments, the process comprises recycling separated solvent system obtained in one or more of the process steps described above back into the process, optionally after one or more work-up step(s).

[0136] In some embodiments of the process, the colored polymeric material derives from a bottle and / or a textile.

[0137] Colorant

[0138] In some embodiments of the process, the colorant is selected from the group consisting of dye and optical brightener and mixtures of dye and optical brightener. A “colorant” is a substance that cause the change of color impression of material. This comprises dyes, which absorb wavelength intervals of visible light (400 to 780 nm) and optical brighteners, which amplify the light emission of a material through UV light adsorption and emittance of visible light (through fluorescence), i.e. an optical brightener converts radiation that is not visible to the human eye (<400nm) into visible fluorescence radiation of the blue-red spectral range (400 to 600 nm). Colorants usable or used for changing the color impression of polymeric materials are known to the skilled person. In the context of the present invention, the term “dye” means any kind of dye such as dye, pigment, dispersion, wherein a dye is, for example, one or more selected from the group consisting of acid dye, basic dye, direct dye, disperse dye, azoic dye, food dye, solvent dye, organic dye, organic pigment, sulfur dye, mordant dye and vat dye. The term “optical brightener” comprises optical brightening agents, fluorescent brightening agents, and fluorescent whitening agents.

[0139] Overviews of colorants for polymeric materials can be found, for example, in “Dyes and Pigments” Metin Agikyildiz, Kubra Gunes, Ahmet Gurses Springer, 2016 (ISBN: 10 : 3319338900); Industrial Organic Pigments - Klaus Hunger, Thomas Heber, Martin II. Schmidt, Friedrich Reisinger, Stefan Wanne Wiley-VCH, 4thedition, 2018 (ISBN: 978-3-527-32608-2); Chemistry and Technology of Natural and Synthetic Dyes and Pigments - Ashis Kumar Samanta, Nasser Awwad, IntechOpen, 2020 (ISBN: 9781789859980, 9781789859973, 9781839687587); Encyclopedia of Color, Dyes, Pigments - Volume 1, Gerhard Pfaff, de Gruyter, 2021 (ISBN: 311058588X); Heinrich Zollinger: Color Chemistry: Syntheses, Properties, and Applications of Organic Dyes and Pigments. 3rdedition. WILEY-VCH Verlag, Weinheim 2003 (ISBN: 3-906390- 23-3); Klaus Hunger (Ed.): Industrial Dyes: Chemistry, Properties, Applications. WILEY-VCH Verlag, Weinheim 2003 (ISBN: 3-662-01950-7); Hermann Rath: Lehrbuch der Textilchemie. ein- schl. der textilchemischen Technologie. 2nd edition. Springer-Verlag, Berlin, Heidelberg 1963 (ISBN: 978-3-662-00065-6); Wilfried Kratzert, Rasmus Peichert: Farbstoffe. Quelle & Meyer, Heidelberg 1981 (ISBN: 3-494-01021-8); Ullmann’s Encyclopedia of industrial chemistry, Wiley- VCH, 2000, sections “dyes and pigments” and “dyes, general survey” (ISBN: 9783527303854).

[0140] In some embodiments of the process, depleted in colorant regarding the polymeric material obtained means that the L*a*b* values of the polymeric material, which is depleted in colorant compared to the polymeric material provided in (a), change in that: the absolute value of a* decreases, preferably by at least 0.2; and / or, preferably and, the absolute value of b* changes, preferably by at least 0.2; and / or, preferably and, the L* value increases, preferably by at least 4, each compared to the L*a*b* values of the colored polymeric material provided in (a), wherein L*a*b* values are determined according to DIN 5033 and DIN EN ISO 11664-1.6. The expression “irrespective of the color” means that, even if analytics are normally done for materials of each color separately, the definitions given above apply for single-colored polymeric materials, but also for polymeric materials having a plurality of colors and mixtures of pieces of polymeric materials, wherein each piece has its own color or its own color mix.

[0141] The condition of being “depleted in colorant”, which is expressed above based on quantitative L*a*b* values is also identifiable visually by the eye: The polymeric material provided in (a) has a certain color, wherein the polymeric material obtained in (b.1) or the extrusion product respectively obtained in (b.2) or (b.2’), as described herein is lighter and whiter respectively. This applies especially for all colorants not being optical brighteners. Depleted in colorant regarding the polymeric material obtained or the extrusion product obtained respectively means, especially with respect to optical brighteners being the colorant, that the intensity of emitted fluorescence radiation (emission), preferably in the range of from 400 to 600 nm, is reduced for the polymeric material obtained in (b.1) or the extrusion product respectively obtained in (b.2) or (b.2’) when irradiated with light with a wavelength in the range of from 250 to 400 nm compared to the intensity of emitted fluorescence radiation (emission), preferably in the range of from 400-600 nm, of the polymeric material provided in (a).

[0142] Methods for determination of the intensity of emitted fluorescence radiation are known to the skilled person, for example, the determination can be made visually by using an UV lamp, by fluorescence determination or determination of quantum yield.

[0143] In some embodiments of the process, the polymer product is or is a part of: a part of a car; preferably cylinder head cover, engine cover, housing for charge air cooler, charge air cooler flap, intake pipe, intake manifold, connector, gear wheel, fan wheel, cooling water box, housing, housing part for heat exchanger, coolant cooler, charge air cooler, thermostat, water pump, radiator, fastening part, part of battery system for electromobility, dashboard, steering column switch, seat, headrest, center console, transmission component, door module, A, B, C or D car pillar cover, spoiler, door handle, exterior mirror, windscreen wiper, windscreen wiper protection housing, decorative grill, cover strip, roof rail, window frame, sunroof frame, antenna panel, headlight and taillight, engine cover, cylinder head cover, intake manifold, airbag, cushion, or coating; a cloth; preferably shirt, trousers, pullover, boot, shoe, shoe sole, tight or jacket; an electrical part; preferably electrical or electronic passive or active component, circuit board, printed circuit board, housing component, foil, line, switch, plug, socket, distributor, relay, resistor, capacitor, inductor, bobbin, lamp, diode, LED, transistor, connector, regulator, integrated circuit (IC), processor, controller, memory, sensor, microswitch, micro- button, semiconductor, reflector housing for light-emitting diodes (LED), fastener for electrical or electronic component, spacer, bolt, strip, slide-in guide, screw, nut, film hinge, snap hook (snap-in), or spring tongue; a consumer, agricultural product or pharmaceutical product; preferably tennis string, climbing rope, bristle, brush, artificial grass, 3D printing filament, grass trimmer, zipper, hook and loop fastener, paper machine clothing, extrusion coating, fishing line, fishing net, offshore line and rope, vial, syringe, ampoule, bottle, sliding element, spindle nut, chain conveyor, plain bearing, roller, wheel, gear, roller, ring gear, screw and spring dampers, hose, pipeline, cable sheathing, socket, switch, cable tie, fan wheel, carpet, box or bottle for cosmetics, mattress, cushion, insulation, detergent, dishwasher tabs or powder, shampoo, body wash, shower gel, soap, fertilizer, fungicide, or pesticide; a packaging for the food industry; preferably mono- or multi-layer blown film, cast film (mono- or multi-layer), biaxially stretched film, or laminating film; or a part of a construction; preferably a rotor blade, insulating material, frame, housing, wall, coating, or separating wall.

[0144] 2ndaspect - extrusion product

[0145] In a second aspect, the invention is directed to an extrusion product, obtained or obtainable from the process of the first aspect. All details, embodiments as well as alternative embodiments described in the section related to the first aspect apply also for the second aspect.

[0146] 3rdaspect - Conversion of further polymer (iii)

[0147] The invention relates in a third aspect to a process, preferably according to the first aspect, comprising the further step: converting the separated further polymer (iii) obtainable by or obtained by the process of the first aspect, preferably the separated further polymer (iii) obtained or obtainable from step (b.1) after separation from the solvent system, to obtain one or more monomer, polymer or polymer product.

[0148] All details and embodiments, as well as alternatively embodiments disclosed above in the section related to the first aspect apply also to the third aspect.

[0149] Preferably, the polymer is and / or the polymer product comprises polyamide (PA); preferably PA 6 or PA 66; polyisocyanate polyaddition product; preferably polyurethane (Pll), thermoplastic polyurethane (TPU), polyurea or polyisocyanurate (PIR); low-density polyethylene (LDPE), high- density polyethylene (HDPE), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyvinyl acetate (PVA), polystyrene (PS), poly acrylonitrile butadiene styrene (ABS), poly styrene acrylonitrile (SAN), poly acrylate styrene acrylonitrile (ASA), polytetrafluoroethylene (PTFE), poly(methyl acrylate) (PMA), poly(methyl methacrylate) (PMMA), polybutadiene (BR, PBD), poly(cis-1 ,4-isoprene), poly(trans-1 ,4-isoprene), polyoxymethylene (POM), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polybutylene adipate coterephthalate (PBAT), polyester (PES), polyether sulfone (PESLI), polyhydroxyalkanoate (PHA), poly-3-hy- droxybutyrate (P3HB), poly-4-hydroxybutyrate (P4HB), polyhydroxyvalerate (PHV), polyhydroxyhexanoate (PHH), polyhydroxyoctanoate (PHO), polylactic acid (PLA), polysulfone (PSU), polyphenylene sulfone (PPSLI), polycarbonate (PC), polyether ether ketone (PEEK), poly(p-phe- nylene oxide) (PPO), poly(p-phenylene ether) (PPE); or copolymer or mixture thereof.

[0150] Preferably, the polymer and / or the polymer product is / are or is / are a part of: a part of a car; preferably cylinder head cover, engine cover, housing for charge air cooler, charge air cooler flap, intake pipe, intake manifold, connector, gear wheel, fan wheel, cooling water box, housing, housing part for heat exchanger, coolant cooler, charge air cooler, thermostat, water pump, radiator, fastening part, part of battery system for electromobility, dashboard, steering column switch, seat, headrest, center console, transmission component, door module, A, B, C or D pillar cover, spoiler, door handle, exterior mirror, windscreen wiper, windscreen wiper protection housing, decorative grill, cover strip, roof rail, window frame, sunroof frame, antenna panel, headlight and taillight, engine cover, cylinder head cover, intake manifold, airbag, cushion, or coating; a cloth; preferably shirt, trousers, pullover, boot, shoe, shoe sole, tight or jacket; an electrical part; preferably electrical or electronic passive or active component, circuit board, printed circuit board, housing component, foil, line, switch, plug, socket, distributor, relay, resistor, capacitor, inductor, bobbin, lamp, diode, LED, transistor, connector, regulator, integrated circuit (IC), processor, controller, memory, sensor, microswitch, microbutton, semiconductor, reflector housing for light-emitting diodes (LED), fastener for electrical or electronic component, spacer, bolt, strip, slide-in guide, screw, nut, film hinge, snap hook (snap-in), or spring tongue; a consumer, agricultural product or pharmaceutical product; preferably tennis string, climbing rope, bristle, brush, artificial grass, 3D printing filament, grass trimmer, zipper, hook and loop fastener, paper machine clothing, extrusion coating, fishing line, fishing net, offshore line and rope, vial, syringe, ampoule, bottle, sliding element, spindle nut, chain conveyor, plain bearing, roller, wheel, gear, roller, ring gear, screw and spring dampers, hose, pipeline, cable sheathing, socket, switch, cable tie, fan wheel, carpet, box or bottle for cosmetics, mattress, cushion, insulation, detergent, dishwasher tabs or powder, shampoo, body wash, shower gel, soap, fertilizer, fungicide, or pesticide; a packaging for the food industry; preferably mono- or multi-layer blown film, cast film (mono- or multi-layer), biaxially stretched film, or laminating film; or a part of a construction; preferably a rotor blade, insulating material, frame, housing, wall, coating, or separating wall.

[0151] Preferably, the content of the separated further polymer (iii) in the polymer and / or 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 the content of the separated further polymer (iii) in the polymer and / or 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 wherein preferably 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.

[0152] The converting steps to obtain the monomer, polymer or polymer product from the separated further polymer (iii) may comprise one or more synthesis steps and can be performed by conventional synthesis and technics well known to a person skilled in the art. Independent of the person skilled in the art to assess novelty and inventive step of the independent claim(s), the person skilled in the art to perform the converting step(s) is preferably from the technical field(s) pyrolysis, gasification, remonomerization, depolymerization, synthesis, production of monomers, polymers and polymer compounds, and / or its further processing (e.g. extrusion, injection molding). Examples of the step(s) of the conversion is / are described in “Industrial Organic Chemistry”, 3. volume, Wiley-VCH, 1997, ISBN: 978-3-527-28838-0, „Kunststoffhandbuch“, 11 volumes in 17 sub-volumes, Carl Hanser Verlag; especially volume 6, „Polyamide“, 1. edition, 1966, volume 7, ..Polyurethane", 3. edition, 1993, and volume 8, “Polyester”, 2. edition 1973; “Industrial Organic Chemistry”, 3. volume, Wiley-VCH, 1997, ISBN: 978-3-527-28838-0, “Injection Molding Reference Guide, 4th edition, CreateSpace Independent Publishing Platform, 2011, ISBN: 978- 1466407824, EP 0989146 A1 , EP 1460094 A1, WO 2006034800 A1 , EP 1529792 A1, WO 2006042674 A1 , EP 0364854 A2, US 5506275 A, EP 0897402 A1, WO 2015082316 A1 , WO 2021021855 A1 , WO 2021126938 A1 , WO 2021021902 A1 , WO 2021092311 A1 , WO 2008155271 A1 , WO 2013139827 A1, each of which is incorporated herein by reference.

[0153] The present invention is further illustrated by the following embodiments and combinations of embodiments as indicated by the respective dependencies and back-references. 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 ... of any of embodiments 1 to 4", 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 ... of any of embodiments 1 , 2, 3, and 4".

[0154] 1 . A process for recycling of a colored polymeric material, which comprises (i) a polyalkylene terephthalate based polymer, and (ii) a colorant, the process comprising

[0155] (a) providing a colored polymeric material and a solvent system; and

[0156] (b.1) contacting the colored polymeric material provided in (a) with the solvent system provided in (a) under conditions allowing for colorant removal but not allowing for dissolution of the polyalkylene terephthalate based polymer, thereby obtaining a solvent system, which is enriched in colorant compared to the solvent system provided, and a polymeric material, which is depleted in colorant compared to the colored polymeric material provided in (a); and

[0157] (b.2) extrusion of the polymeric material, which is depleted in colorant, obtained in (b.1), thereby obtaining an extrusion product, which is depleted in colorant compared to the colored polymeric material provided in (a); or

[0158] (b.T) extrusion of the colored polymeric material provided in (a), thereby obtaining a colored extrusion product; and

[0159] (b.2’) contacting the colored extrusion product obtained in (b.T) with the solvent system provided in (a) under conditions allowing for colorant removal but not allowing for dissolution of the polyalkylene terephthalate based polymer, thereby obtaining a solvent system, which is enriched in colorant compared to the solvent system provided, and an extrusion product, which is depleted in colorant compared to the colored polymeric material provided in (a).

[0160] 2. The process of embodiment 1 , wherein (b.1) or (b.2’) comprises

[0161] (b.i) providing the colored polymeric material or the colored extrusion product respectively in a first vessel and providing the solvent system in a second vessel; wherein first and second vessel are arranged spatially separated from each other but allowing a gaseous and fluid communication between each other;

[0162] (b.ii) forming a gaseous stream comprising at least parts of the solvent system, and removing the gaseous stream from the second vessel; (b.iii) allowing the solvent system to separate in liquid form from the gaseous stream at a position outside the second vessel (also outside the first vessel), obtaining a solvent system in liquid form;

[0163] (b.iv) contacting the colored polymeric material or the colored extrusion product respectively in the first vessel with the solvent system in liquid form, which had been separated from the gaseous stream in (b.iii), thereby obtaining a solvent system, which is enriched in colorant compared to the solvent system provided in (a), and a polymeric material or an extrusion product respectively, which is depleted in colorant compared to the colored polymeric material provided in (a) and which comprises the polyalkylene terephthalate based polymer (i). The process according to embodiment 2, wherein (b.ii) comprises

[0164] (b.ii.1) heating the solvent system to a temperature at least equal to or above the boiling temperature of the solvent system;

[0165] (b.ii.2) obtaining a gaseous stream comprising at least parts of the solvent system. The process according to embodiment 2 or 3, wherein additionally an inert gas is applied, which forms parts of the gaseous stream comprising at least parts of the solvent system. The process according to any one of embodiments 2 to 4, wherein (b.ii) comprises

[0166] (b.ii.1’) heating the solvent system to a temperature T of at most 3K below the boiling temperature of the solvent system; so that a solvent system having elevated temperature is obtained;

[0167] (b.ii.2’) contacting the solvent system having elevated temperature with an inert gas, preferably passing inert gas through the solvent system having elevated temperature, so that a gaseous stream comprising at least parts of the solvent system is formed. The process according to any one of embodiments 2 to 5, wherein (b.iii) comprises

[0168] (b.iii.1) transferring the gaseous stream from the second vessel to a position outside the second vessel (also outside the first vessel);

[0169] (b.iii.2) allowing the parts of the solvent system comprised in the gaseous stream to separate in liquid form from the gaseous stream at the position outside the second vessel (also outside the first vessel), obtaining a solvent system in liquid form. The process according to any one of embodiments 2 to 6, wherein (b.iv) comprises (b.iv.1) transferring the solvent system in liquid form obtained in (b.iii) to the polymeric material or the extrusion product respectively in the first vessel;

[0170] (b.iv.2) contacting the polymeric material or the extrusion product respectively in the first vessel with the solvent system in liquid form, thereby obtaining a solvent system, which is enriched in colorant compared to the solvent system provided in (a), and a polymeric material or an extrusion product respectively, which is depleted in colorant compared to the colored polymeric material provided in (a) and which comprises the polyalkylene terephthalate based polymer. The process according to any one of embodiments 2 to 7, wherein first vessel containing the polymeric material or the extrusion product respectively and second vessel containing the solvent system are arranged spatially separated from each other in that the first vessel containing the polymeric material is arranged above the second vessel containing the solvent system. The process according to embodiment 7 or 8, wherein (b.iv) comprises contacting the polymeric material or the extrusion product respectively with the solvent system in liquid form of (b.iii) in that the solvent system in liquid form drops onto the polymeric material or onto the extrusion product respectively. The process according to any one of embodiments 2 to 9, wherein the inert gas is selected from the group consisting of argon, helium, neon, nitrogen and mixtures of two or more of these inert gases, preferably comprises at least nitrogen, more preferably the inert gas is nitrogen. The process according to any one of embodiments 2 to 10, wherein the inert gas is conducted through the solvent system and has a flow rate in the range of from 1 to 150 liter / h or is passed along the surface of the solvent system and has a flow rate of in the range of from 1 to 150 liter / h. The process according to any one of embodiments 2 to 11, further comprising

[0171] (b.v) removal of the solvent system obtained in (b.iv) or (b.iv.2), which is enriched in colorant from the polymeric material or the extrusion product respectively (i.e. also out of the first vessel) and recirculation into the second vessel comprising the solvent system, preferably by dropping it into the second vessel comprising the solvent system (allowing the solvent system obtained in (b.iv) or (b.iv.2) or to drop into the second vessel comprising the solvent system). 13. The process according to any one of embodiments 2 to 12, wherein (b.ii), (b.iii) and (b.iv), preferably (b.ii), (b.iii), (b.iv) and (b.v), are carried out in continuous mode.

[0172] 14. The process according to any one of embodiments 2 to 13, further comprising

[0173] (b.vi) at least partial separation of polymeric material or extrusion product respectively obtained in (b.iv) or (b.iv.2) from the solvent system, thereby obtaining a polymeric material or an extrusion product respectively, which is depleted in colorant compared to the colored polymeric material provided in (a) and which comprises the polyalkylene terephthalate based polymer.

[0174] 15. The process according to embodiment 14, further comprising

[0175] (b.vii) at least partial replacement of the polymeric material or the extrusion product respectively separated in (b.vi) by fresh colored polymeric material or fresh colored extrusion product respectively without replacement of the solvent system provided in (a), wherein the fresh colored polymeric material or fresh colored extrusion product respectively comprises polyalkylene terephthalate based polymer and colorant, and repetition of step(s) (b.ii), (b.iii) and (b.iv), optionally (b.v); wherein steps (b.vi) and (b.vii) are preferably repeated at least one further time, preferably in the range of one to at least 10 further time(s) (batch mode); or wherein steps (b.vi) and (b.vii) are carried out continuously (purge mode). . The process according to any one of embodiments 2 to 15, wherein in the range of from 1 to 50 weight-% of additional fresh solvent system, based on the total weight of the solvent system provided in (a) being 100 weight-% are added, wherein the addition is carried out discontinuously (batch mode) or continuously (purge mode).

[0176] 17. The process according to embodiment 1 , wherein (b.1) or (b.2’) comprises

[0177] (b.i’) contacting the colored polymeric material of (a) or the colored extrusion product of (b.2) respectively with a solvent system at a temperature T, which is < 170 °C, thereby obtaining a solvent system, which is enriched in colorant compared to the solvent system provided in (a), and a polymeric material or an extrusion product respectively, which is depleted in colorant compared to the colored polymeric material provided in (a);

[0178] (b.ii’) optionally separating the polymeric material or the extrusion product respectively, which is depleted in colorant. 18. The process of embodiment 17, wherein contacting in (b.i’) is done at a temperature in the range of from 160 °C to the temperature T, which is in the range of from 10 to <170 °C, preferably in the range of from 110 to 165 °C, more preferably in the range of from 120 to 150 °C.

[0179] 19. The process of embodiment 17 or 18, wherein (b.i’) is done at a pressure in the range of from 800 to 200,000 hPa.

[0180] 20. The process according to any one of embodiments 1 to 19, wherein the solvent system comprises one or more solvent(s), wherein the solvent system

[0181] (s.1) has Hansen solubility parameters with respect to

[0182] - energy from dispersion forces between molecules (bDss),

[0183] - energy from dipolar intermolecular force between molecules (bPss) and

[0184] - energy from hydrogen bonds between molecules (5HSs), which fulfill equitation 1

[0185] (11)2> 4(5Dss-17.5)2+ (SPss-7.5)2+ (5Hss-7.5)2[equitation 1],

[0186] 21. The process according to any one of embodiment 1 to 20, wherein the solvent system comprises one or more solvent(s), wherein the solvent system

[0187] (s.1a) has Hansen solubility parameters with respect to energy from dispersion forces between molecules (bDss), energy from dipolar intermolecular force between molecules (bPss) and energy from hydrogen bonds between molecules (5HSs), which fulfill equitation 2

[0188] (8.8)2> 4(5Dss-20)2+ (SPss-11.8)2+ (5Hss-4.5)2[equitation 2],

[0189] 22. The process according to any one of embodiment 1 to 21, wherein

[0190] (s.2) each solvent of the solvent system has a boiling point at 1013 hPa of at least 150 °C, preferably of at least 160 °C.

[0191] 23. The process according to any one of embodiments 1 to 22, wherein (s.3) solvents having a functional group selected from the group consisting of hydroxyl (OH), amino (NH2), carboxyl (COOH), carboxylate (COO-), and thiol (SH) are excluded.

[0192] 24. The process according to any one of embodiments 1 to 23, wherein at least 90 weight-%, preferably at least 95 weight-%, more preferably at least 98 weight-%, more preferably in the range of from 99 to 100 weight-%, of the solvent system consist of two or more solvents), based on the total weight of the solvent system being 100 weight-%.

[0193] 25. The process according to any one of embodiments 1 to 24, wherein at least 90 weight-%, preferably at least 95 weight-%, more preferably at least 98 weight-%, more preferably in the range of from 99 to 100 weight-%, of the solvent system consist of one solvent, which fulfills equitation 1 and / or 2, based on the total weight of the solvent system being

[0194] 100 weight-%.

[0195] 26. The process according to any one of embodiments 1 to 25, wherein the one or more solvents) of the solvent system is / are selected from the group consisting of N,N-dimethylbenzamide, N,N-dimethylphenylacetamide, 1,4-benzoquinone, acetophenone, dimethyl terephthalate, 1,3,5-trimethoxybenzene, 2-phenylacetophenone, N- methylcaprolactam, methylbenzoate, methyl-4-methoxybenzoate, butylene carbonate, propylene-glycol-dibenzoate, N-ethylpyrrolidone, benzophenone, di-benzyl malonate, N- ethyl-caprolactam, methyl 2-(5-oxotetrahydrofuran-3-yl)acetate (FAME), propiophenone, N-methoxypropyl-pyrrolidone, 1,4-cyclohexanedione, cyclohexane-carbonate, N-methoxy- ethyl-pyrrolidone, N,N-diethylphenylacetamide, phenyl acetate, 1-(2-hydroxyethyl)pyrroli- din-2-one acetate (HEPAc), N,N-diethylbenzamide, isopropyl-benzoate, cyclohexyl phenyl ketone, phenylacetic acid ethylester, phenylacetat, N-methyl-morpholine, benzyl-propio- nate, benzylacetate, Neopentyl-glycol-dibenzoate, tetrahydrofurfuryl acetate, N-methyl- imidazole, benzyl butyrate, 2-pyrrolidone, 2-phenoxyethanol propionate, 2-phenoxyethyl isobutyrate, N,N-dipropylbenzamide, N,N-dimethylacetamide, N,N-diethylacetamide, dihy- drolevoglucosenon (Cyrene), propylenecarbonate, caprolactone, dimethylisosorbide, N- butylpyrrolidone, t-butylpyrrolidone, methyl-1-methyl-5-oxopyrrolidine-3-carboxylate (MMOC), gamma-valerolactone (GVL), delta-valerolactone, gamma butyrolactone, methyl 5-(dimethylamino)-2-methyl-5-oxopentanoate (Rhodiasolv Polarclean), caprolactam, phen ethyl acetate, methyl phenylacetate, benzyl benzoate, N,N-dimethyllactamide (Agnique AMD 3L), and dimethyl sulfoxide (DMSO). The process according to any one of embodiments 1 to 26, wherein the one or more solvents) of the solvent system is / are selected from the group consisting of dihydrolevoglu- cosenon (Cyrene), propylenecarbonate, caprolactone, dimethylisosorbide, N-butylpyrroli- done, t-butylpyrrolidone, methyl-1-methyl-5-oxopyrrolidine-3-carboxylate (MMOC), gamma-valerolactone (GVL), delta-valerolactone, gamma butyrolactone, dimethylsulfoxide, methyl 5-(dimethylamino)-2-methyl-5-oxopentanoate (RhodiasolvOPolarclean), caprolactam, phenethyl acetate, methyl phenylacetate, benzyl benzoate, phenyl benzoate, methyl benzoate, propyl benzoate, and dimethyl sulfoxide (DMSO). The process according to any one of embodiments 1 to 27, wherein the one or more solvents) of the solvent system is / are selected from the group consisting of propylenecarbonate, N-butylpyrrolidone, t-butylpyrrolidone, methyl-1-methyl-5-oxopyrrolidine-3-carbox- ylate (MMOC), delta-valerolactone, gamma butyrolactone, methyl 5-(dimethylamino)-2- methyl-5-oxopentanoate (RhodiasolvOPolarclean), caprolactam, phenethyl acetate, methyl phenylacetate, benzyl benzoate, phenyl benzoate, methyl benzoate, propyl benzoate and GVL. The process according to any one of embodiments 1 to 28, wherein the one or more solvents) of the solvent system is / are selected from the group consisting of propylenecarbonate, N-butylpyrrolidone, t-butylpyrrolidone, methyl-1-methyl-5-oxopyrrolidine-3-carbox- ylate (MMOC), delta-valerolactone, gamma butyrolactone, methyl 5-(dimethylamino)-2- methyl-5-oxopentanoate (RhodiasolvOPolarclean), caprolactam, phenethyl acetate, methyl phenylacetate, benzyl benzoate, phenyl benzoate, methyl benzoate, and propyl benzoate. The process according to any one of embodiments 1 to 29, wherein the one or more solvents) of the solvent system is / are selected from the group consisting of propylenecarbonate, N-butylpyrrolidone, t-butylpyrrolidone, methyl-1-methyl-5-oxopyrrolidine-3-carbox- ylate (MMOC), methyl 5-(dimethylamino)-2-methyl-5-oxopentanoate (RhodiasolvOPolar- clean), phenethyl acetate, and GVL. The process according to any one of embodiments 1 to 30, wherein the one or more solvents) of the solvent system is / are selected from the group consisting of propylenecarbonate, N-butylpyrrolidone, t-butylpyrrolidone, methyl-1-methyl-5-oxopyrrolidine-3-carbox- ylate (MMOC), methyl 5-(dimethylamino)-2-methyl-5-oxopentanoate (RhodiasolvOPolar- clean), and phenethyl acetate. The process of any one of embodiments 1 to 31 , wherein the one or more solvent(s) is / are selected from the group consisting of gamma valerolactone (GVL), N-butylpyrrolidone (NBP), propylenecarbonate, acetophenone dimethyl sulfoxide (DMSO), dihydrolevoglu- cosenon (Gyrene), cyclohexanone and mixtures of two or more thereof, or from the group consisting of N-butylpyrrolidone (NBP), propylenecarbonate, acetophenone dimethyl sulfoxide (DMSO), dihydrolevoglucosenon (Gyrene), cyclohexanone and mixtures of two or more thereof. The process of any one of embodiments 1 to 32, wherein the one or more solvent(s) is / are selected from the group consisting of GVL, NBP, propylenecarbonate, acetophenone, DMSO, Gyrene and mixtures of two or more thereof, or from the group consisting of NBP, propylenecarbonate, acetophenone, DMSO, Gyrene and mixtures of two or more thereof. The process of any one of embodiments 1 to 33, wherein the one or more solvent(s) is / are selected from the group consisting of GVL, NBP, propylenecarbonate, acetophenone, DMSO and mixtures of two or more thereof, or from the group consisting of NBP, propylenecarbonate, acetophenone, DMSO and mixtures of two or more thereof. The process of any one of embodiments 1 to 34, wherein the one or more solvent(s) is / are selected from the group consisting of GVL, NBP, propylenecarbonate, acetophenone and mixtures of two or more thereof, or from the group consisting of NBP, propylenecarbonate, acetophenone and mixtures of two or three thereof. The process of any one of embodiments 1 to 35, wherein the one or more solvent(s) comprise at least N-butylpyrrolidone (NBP), preferably at least 90 weight-% of the one or more solvent(s), more preferably at least 95 weight-%, more preferably at least 98 weight-%, more preferably at least 99 weight-%, more preferably at least 99.5 weight-%, more preferably at least 99.9 weight-%, of the one or more solvent(s) are NBP, based on a total weight of the one or more solvent(s) being 100 weight-%, more preferably the one solvent is NBP; or wherein the one or more solvent(s) comprise at least propylenecarbonate, preferably at least 90 weight-% of the one or more solvent(s), more preferably at least 95 weight-%, more preferably at least 98 weight-%, more preferably at least 99 weight-%, more preferably at least 99.5 weight-%, more preferably at least 99.9 weight-%, of the one or more solvents) are propylenecarbonate, based on a total weight of the one or more solvent(s) being 100 weight-%, more preferably the one solvent is propylenecarbonate; or wherein the one or more solvent(s) comprise at least acetophenone, preferably at least 90 weight-% of the one or more solvent(s), more preferably at least 95 weight-%, more preferably at least 98 weight-%, more preferably at least 99 weight-%, more preferably at least 99.5 weight-%, more preferably at least 99.9 weight-%, of the one or more solvent(s) are acetophenone, based on a total weight of the one or more solvent(s) being 100 weight-%, more preferably the one solvent is acetophenone; or wherein the one or more solvent(s) comprise at least dimethyl suolfoxide (DMSO), preferably at least 90 weight-% of the one or more solvent(s), more preferably at least 95 weight-%, more preferably at least 98 weight-%, more preferably at least 99 weight-%, more preferably at least 99.5 weight-%, more preferably at least 99.9 weight-%, of the one or more solvent(s) are DMSO, based on a total weight of the one or more solvent(s) being 100 weight-%, more preferably the one solvent is DMSO; or wherein the one or more solvent(s) comprise at least dihydrolevoglucosenon (Gyrene), preferably at least 90 weight-% of the one or more solvent(s), more preferably at least 95 weight-%, more preferably at least 98 weight-%, more preferably at least 99 weight-%, more preferably at least 99.5 weight-%, more preferably at least 99.9 weight-%, of the one or more solvent(s) are Gyrene, based on a total weight of the one or more solvent(s) being 100 weight-%, more preferably the one solvent is Gyrene; or wherein the one or more solvent(s) comprise at least cyclohexanone, preferably at least 90 weight-% of the one or more solvent(s), more preferably at least 95 weight-%, more preferably at least 98 weight-%, more preferably at least 99 weight-%, more preferably at least 99.5 weight-%, more preferably at least 99.9 weight-%, of the one or more solvent(s) are cyclohexanone, based on a total weight of the one or more solvent(s) being 100 weight-%, more preferably the one solvent is cyclohexanone.

[0196] 37. The process of any one of embodiments 1 to 36, wherein ethyl benzoate and butyl benzoate are excluded as solvent(s).

[0197] 38. The process according to any one of embodiments 1 to 37, wherein the solvent system comprises GVL, wherein preferably at least 90 weight-%, more preferably at least

[0198] 95 weight-%, more preferably at least 98 weight-%, more preferably in the range of from 99 to 100 weight-%, based on the total weight of the solvent system being 100 weight-%, of the solvent system of the solvent system consist of GVL.

[0199] 39. The process of any one of embodiments 1 to 38, including de-gassing, preferably in-between (b.1) and (b.2) and / or during extrusion, and Solid State Polymerization (SSP).

[0200] 40. The process of any one of embodiments 1 to 38, wherein the extrusion in (b.2) or (b.T) is melt extrusion. The process of any one of embodiments 1 to 40, wherein the extrusion in (b.2) comprises

[0201] (b.2.1) extrusion of melted polymeric material, which is depleted in colorant, obtained in (b.1), thereby obtaining an extrudate;

[0202] (b.2.2) pelletizing the extrudate obtained in (b.2.1), thereby obtaining an extrusion product, which is depleted in colorant compared to the colored polymeric material provided in (a); The process of any one of embodiments 1 to 40, wherein the extrusion in (b.T) comprises

[0203] (b.1’.1) extrusion of melted colored polymeric material provided in (a), thereby obtaining a colored extrudate;

[0204] In some embodiments of the process, the extrusion in (b.2) comprises

[0205] (b.2.1) extrusion of melted polymeric material, which is depleted in colorant, obtained in (b.1), thereby obtaining an extrudate;

[0206] (b.2.2) pelletizing the extrudate obtained in (b.2.1), thereby obtaining an extrusion product, which is depleted in colorant compared to the colored polymeric material provided in (a); and / or wherein the extrusion in (b.T) comprises

[0207] (b.1’.1) extrusion of melted colored polymeric material provided in (a), thereby obtaining a colored extrudate;

[0208] (b.T.2) pelletzing the colored extrudate obtained in (b.1’.1), thereby obtaining a colored extrusion product. The process of any one of embodiments 1 to 42, wherein the extrusion product, which is depleted in colorant compared to the colored polymeric material provided in (a) obtained in (b.2) or (b.2’) respectively, is further processed to give a polymer product, preferably by melt-spinning extrusion to give a fiber. The process of any one of embodiments 1 to 43, wherein the extrusion in (b.2) or (b.T) is further processed to give a polymer product, preferably by melt-blow extrusion. The process of embodiment 44, wherein the melt-blow extrusion is an injection stretch blow molding or an extrusion blow molding. 46. The process of embodiment 44 or 45, wherein the polymer product is a three-dimensional hollow body, preferably a bottle.

[0209] 47. The process of any one of embodiments 1 to 46, wherein the polyalkylene terephthalate based polymer consists of either oxyethylen units or oxybutylen units and oxyterephthaloyl units, wherein in case of oxyethylen units, in the range of from 0 to 5 mol-% of the oxyterephthaloyl units are replaced by oxyisophthaloyl units and / or in the range of from 0 to 49 mol-% of the oxyethylen units are replaced by oxymethylene cyclohexylene methylene units; wherein more preferably, the polyalkylene terephthalate based polymer is selected from the group consisting of PET (polyethylene terephthalate), PETI (poly(ethylene ter- ephthalate-co-isophthalate)), PBT (polybutylene terephthalate), and mixtures of two or three of these polymers; wherein more preferably the polyalkylene terephthalate based polymer comprises or is PET.

[0210] 48. The process of any one of embodiments 1 to 47, wherein at least 90 weight-%, preferably at least 95 weight-%, more preferably at least 99.9 weight-%, of the colored polymeric material consist of polyalkylene terephthalate based polymer (i) and colorant (ii).

[0211] 49. The process of any one of embodiments 1 to 48, wherein the colored polymeric material derives from a bottle and / or a textile.

[0212] 50. The process according to any one of embodiments 1 to 49, wherein the colorant is selected from the group consisting of dye and optical brightener and mixtures of dye and optical brightener.

[0213] 51 . The process according to any one of embodiments 1 to 50, wherein depleted in colorant regarding the polymeric material obtained means that the L*a*b* values of the polymeric material, which is depleted in colorant compared to the polymeric material provided in (a), change in that: the absolute value of a* decreases, preferably by at least 0.2; and / or, preferably and, the absolute value of b* changes, preferably by at least 0.2; and / or, preferably and, the L* value increases, preferably by at least 4, each compared to the L*a*b* values of the colored polymeric material provided in (a), wherein L*a*b* values are determined according to DIN 5033 and DIN EN ISO 11664-1.6.

[0214] 52. Process, preferably according to any one of embodiments 1 to 51 , wherein the extrusion product is a part of: a part of a car; preferably cylinder head cover, engine cover, housing for charge air cooler, charge air cooler flap, intake pipe, intake manifold, connector, gear wheel, fan wheel, cooling water box, housing, housing part for heat exchanger, coolant cooler, charge air cooler, thermostat, water pump, radiator, fastening part, part of battery system for electromobility, dashboard, steering column switch, seat, headrest, center console, transmission component, door module, A, B, C or D car pillar cover, spoiler, door handle, exterior mirror, windscreen wiper, windscreen wiper protection housing, decorative grill, cover strip, roof rail, window frame, sunroof frame, antenna panel, headlight and taillight, engine cover, cylinder head cover, intake manifold, airbag, cushion, or coating; a cloth; preferably shirt, trousers, pullover, boot, shoe, shoe sole, tight or jacket; an electrical part; preferably electrical or electronic passive or active component, circuit board, printed circuit board, housing component, foil, line, switch, plug, socket, distributor, relay, resistor, capacitor, inductor, bobbin, lamp, diode, LED, transistor, connector, regulator, integrated circuit (IC), processor, controller, memory, sensor, microswitch, microbutton, semiconductor, reflector housing for light-emitting diodes (LED), fastener for electrical or electronic component, spacer, bolt, strip, slide-in guide, screw, nut, film hinge, snap hook (snap-in), or spring tongue; a consumer, agricultural product or pharmaceutical product; preferably tennis string, climbing rope, bristle, brush, artificial grass, 3D printing filament, grass trimmer, zipper, hook and loop fastener, paper machine clothing, extrusion coating, fishing line, fishing net, offshore line and rope, vial, syringe, ampoule, bottle, sliding element, spindle nut, chain conveyor, plain bearing, roller, wheel, gear, roller, ring gear, screw and spring dampers, hose, pipeline, cable sheathing, socket, switch, cable tie, fan wheel, carpet, box or bottle for cosmetics, mattress, cushion, insulation, detergent, dishwasher tabs or powder, shampoo, body wash, shower gel, soap, fertilizer, fungicide, or pesticide; a packaging for the food industry; preferably mono- or multi-layer blown film, cast film (mono- or multi-layer), biaxially stretched film, or laminating film; or a part of a construction; preferably a rotor blade, insulating material, frame, housing, wall, coating, or separating wall. Extrusion product, obtained or obtainable from the process of any one of embodiments 1 to 51. The process, preferably according to any one of embodiments 1 to 51 , comprising the further step: converting the separated further polymer (iii) obtainable by or obtained by the process of the first aspect, preferably the separated further polymer (iii) obtained or obtainable from step (b.1) after separation from the solvent system, to obtain one or more monomer, polymer or polymer product. Process according to embodiment 54, wherein the polymer is and / or the polymer product comprises polyamide (PA); preferably PA 6 or PA 66; polyisocyanate polyaddition product; preferably polyurethane (Pll), thermoplastic polyurethane (TPU), polyurea or polyisocyanurate (PIR); low-density polyethylene (LDPE), high-density polyethylene (HDPE), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyvinyl acetate (PVA), polystyrene (PS), poly acrylonitrile butadiene styrene (ABS), poly styrene acrylonitrile (SAN), poly acrylate styrene acrylonitrile (ASA), polytetrafluoroethylene (PTFE), poly(methyl acrylate) (PMA), poly(methyl methacrylate) (PMMA), polybutadiene (BR, PBD), poly(cis-1 ,4-isoprene), poly(trans-1 ,4-iso- prene), polyoxymethylene (POM), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polybutylene adipate coterephthalate (PBAT), polyester (PES), polyether sulfone (PESLI), polyhydroxyalkanoate (PHA), poly-3-hydroxybutyrate (P3HB), poly-4-hy- droxybutyrate (P4HB), polyhydroxyvalerate (PHV), polyhydroxyhexanoate (PHH), polyhydroxyoctanoate (PHO), polylactic acid (PLA), polysulfone (PSU), polyphenylene sulfone (PPSLI), polycarbonate (PC), polyether ether ketone (PEEK), poly(p-phenylene oxide) (PPO), poly(p-phenylene ether) (PPE); or copolymer or mixture thereof. Process according to embodiment 54 or 55, wherein the polymer and / or the polymer product is / are or is / are a part of: a part of a car; preferably cylinder head cover, engine cover, housing for charge air cooler, charge air cooler flap, intake pipe, intake manifold, connector, gear wheel, fan wheel, cooling water box, housing, housing part for heat exchanger, coolant cooler, charge air cooler, thermostat, water pump, radiator, fastening part, part of battery system for electromobility, dashboard, steering column switch, seat, headrest, center console, transmission component, door module, A, B, C or D pillar cover, spoiler, door handle, exterior mirror, windscreen wiper, windscreen wiper protection housing, decorative grill, cover strip, roof rail, window frame, sunroof frame, antenna panel, headlight and taillight, engine cover, cylinder head cover, intake manifold, airbag, cushion, or coating; a cloth; preferably shirt, trousers, pullover, boot, shoe, shoe sole, tight or jacket; an electrical part; preferably electrical or electronic passive or active component, circuit board, printed circuit board, housing component, foil, line, switch, plug, socket, distributor, relay, resistor, capacitor, inductor, bobbin, lamp, diode, LED, transistor, connector, regulator, integrated circuit (I C) , processor, controller, memory, sensor, microswitch, microbutton, semiconductor, reflector housing for light-emitting diodes (LED), fastener for electrical or electronic component, spacer, bolt, strip, slide-in guide, screw, nut, film hinge, snap hook (snap-in), or spring tongue; a consumer, agricultural product or pharmaceutical product; preferably tennis string, climbing rope, bristle, brush, artificial grass, 3D printing filament, grass trimmer, zipper, hook and loop fastener, paper machine clothing, extrusion coating, fishing line, fishing net, offshore line and rope, vial, syringe, ampoule, bottle, sliding element, spindle nut, chain conveyor, plain bearing, roller, wheel, gear, roller, ring gear, screw and spring dampers, hose, pipeline, cable sheathing, socket, switch, cable tie, fan wheel, carpet, box or bottle for cosmetics, mattress, cushion, insulation, detergent, dishwasher tabs or powder, shampoo, body wash, shower gel, soap, fertilizer, fungicide, or pesticide; a packaging for the food industry; preferably mono- or multi-layer blown film, cast film (mono- or multi-layer), biaxially stretched film, or laminating film; or a part of a construction; preferably a rotor blade, insulating material, frame, housing, wall, coating, or separating wall.

[0215] 57. Process according to any one of embodiments 54 to 56, wherein the content of the separated further polymer (iii) in the polymer and / or 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 separated further polymer (iii) in the polymer and / or 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.

[0216] The present invention is further illustrated by the following reference examples, comparative examples, and examples. Examples

[0217] Methods

[0218] GPC (Gel-Permeation Chromatography):

[0219] Sample preparation:

[0220] 7.5 mg sample was dissolved in 5 ml eluent (hexafluorisopropanol + 0.05 weight-% trifluoro potassium acetate) over night. All sample solutions were filtered by a Millipore Millex FG (0.2 pm) filtered prior to injection. Sealed sample vials were placed into the auto sampler.

[0221] Experimental conditions:

[0222] An Agilent 1100 HPLC system, consisting of an isocratic pump, vacuum degasser, auto sampler and a column oven (40°C) was used. Furthermore, the Agilent system contained as detectors a Differential Refractive Index (DRI) and a variable Ultra Violet (UVW) Detector. Data acquisition and data processing of conventionally SEC data were done by WinGPC Unichrom, of PSS (Polymer Standard Services). A combination of a PL-HFIP guard (7.5 x 50 mm) column and 2 PL- HFIP Gel columns (7.5 x 300 mm, 9p) of Agilent were put in series. As an eluent, hexafluorisopropanol + 0.05 weight-% trifluoro potassium acetate was used as a flow rate of 1 ml / min. Of each sample solution 50pl was injected. The calibration was obtained by narrow molar mass distributed PMMA standards (Polymer Standard Services) having a molar mass range of M= 800 till M = 2.200.000 g / mol. Molar masses outside this range were extrapolated.

[0223] CIE-LAB:

[0224] L*a*b* values were determined in that the samples were measured using an integrating sphere and UV / VIS-remission spectra (with a wavelength area of 400-700 nm) were obtained. The data of these spectra were analyzed by the software OptLab-SPX using 2° standard observer and the standard light type C. The OptLab-SPX software calculates the L*a*b*-values based on DIN 5033 and DIN EN ISO 11664-1.6 from the years 2007-2014.

[0225] Chemicals

[0226] Reference Example 1 : Discoloration and subsequent extrusion

[0227] Discoloration: PET textile (of any colour) was cut / shredded into pieces and placed in a reaction vessel (e.g. flask, tube, reaction vessel). The solvent system was added (in mass-based ratio solvent : polymeric material 100:1 to 1 :1 , preferred 10:1-1 :1) and the mixture was heated by use of a suitable heating system (e.g. oil bath, heating blocks, mini-plant vessels) to a temperature in the range of from 60 to 160 °C. After 0.5-8 h the mixture was filtered, whereby the solvent enriched in colorant and discolored polymeric material was obtained and the colour-depleted polymeric material was washed with a small amount of the respective solvent. For an easy removal of said solvent and a faster drying process of the colour-depleted polymeric material pieces, small amounts of acetone can be used in a second washing step. The thus obtained colour-depleted polymeric material was dried (for example in a vacuum compartment dryer).

[0228] Extrusion: The dried colour-depleted polymeric material was melted at a temperature in the range of from 250 to 270 °C and the speed of the screws of the extruder was set to (70-300 rpm, in this experiment 80 rpm). The residence time of the polymer was in the range of from 0.5 to 6 min. When leaving the extruder the material was transferred to a water bath and subsequently granulated.

[0229] Reference Example 2: Extrusion and subsequent discoloration

[0230] Extrusion: PET textile (of any colour) was cut / shredded into pieces and was melted at a temperature in the range of from 250 to 270 °C and the speed of the screws of the extruder was set to (70-300 rpm, in this experiment 80 rpm). The residence time of the polymer was in the range of from 0.5 to 6 min. When leaving the extruder the material was transferred to a water bath and subsequently granulated.

[0231] Discoloration: PET textile granules (of any colour) which were received after extrusion and granulation of post-consumer textile PET waste were placed in a reaction vessel (e.g. flask, tube, reaction vessel). The solvent system was added (in mass-based ratio solvent : polymeric material 100:1 to 1 :1 , preferred 10:1-1 :1) and the mixture was heated by use of a suitable heating system (e.g. oil bath, heating blocks, mini-plant vessels) to a temperature in the range of from 60 to 160 °C. After 0.5-8 h the mixture was filtered, whereby the solvent enriched in colorant and discolored granules were obtained and the colour-depleted granules were washed with a small amount of the respective solvent. For an easy removal of said solvent and a faster drying process of the colour-depleted granules, small amounts of acetone can be used in a second washing step. The thus obtained colour-depleted granules were dried (for example in a vacuum compartment dryer).

[0232] Examples 1 to 3: Discoloration and subsequent extrusion

[0233] PET textile were treated according to Reference Example 1 , wherein discoloration was done with GVL (Example 1), Gyrene (Example 2) and cyclohexanone (Example 3).

[0234] The dried colour-depleted polymeric material before and after discoloration (before extraction) was analysed with respect to discoloration, and via GPC regarding number average molecular weight Mn, mass average molecular weight Mw and dispersity (Mw / Mn), wherein the results are listed below in Tables 1 and 2:

[0235] Table 1

[0236] CIE-LAB values before and after discoloration

[0237] Table 2

[0238] GPC data before and after discoloration

[0239] 0 average determined based on the individual results.

[0240] After extrusion, the resulting granules were analysed via GPC regarding number average molecular weight Mn, mass average molecular weight Mw and dispersity (Mw / Mn), wherein the re- suits are listed below in Table 3:

[0241] Table 3

[0242] GPC data of granules after extrusion

[0243] 0: average determined based on the individual results.

[0244] It was found that discoloration was achieved with all solvents without decrease in number average molecular weight Mn but with increase of mass average molecular weight Mw and decrease of dispersity. Extrusion of discolored textile pieces was achieved. The number average molecular weight Mn of the granules after extrusion was slightly decreased which is a normal I known behavior when melting PET at high temperatures. Examples 4 to 7: Extrusion with subsequent discoloration

[0245] PET textile were treated according to Reference Example 2, wherein discoloration was done with GVL (Example 4), Gyrene (Example 5), GBL (Example 6) and cyclohexanone (Example 7).

[0246] The obtained granules were analysed with respect to discoloration, wherein the results are listed below in Table 4:

[0247] Table 4

[0248] CIE-LAB values of granules before and after discoloration

[0249] Cited Literature

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[0273] US 5506275 A

[0274] EP 0897402 A1

[0275] WO 2015082316 A1

[0276] WO 2021021855 A1 WO 2021021902 A1

[0277] WO 2021092311 A1

[0278] WO 2008155271 A1 - WO 2013139827 A1

Claims

Claims1 . A process for recycling of a colored polymeric material, which comprises (i) a polyalkylene terephthalate based polymer, and (ii) a colorant, the process comprising(a) providing a colored polymeric material and a solvent system comprising gamma valerolactone (GVL); and(b.1) contacting the colored polymeric material provided in (a) with the solvent system provided in (a) under conditions allowing for colorant removal but not allowing for dissolution of the polyalkylene terephthalate based polymer, thereby obtaining a solvent system, which is enriched in colorant compared to the solvent system provided, and a polymeric material, which is depleted in colorant compared to the colored polymeric material provided in (a); and(b.2) extrusion of the polymeric material, which is depleted in colorant, obtained in (b.1), thereby obtaining an extrusion product, which is depleted in colorant compared to the colored polymeric material provided in (a); or(b.T) extrusion of the colored polymeric material provided in (a), thereby obtaining a colored extrusion product; and(b.2’) contacting the colored extrusion product obtained in (b.1’) with the solvent system provided in (a) under conditions allowing for colorant removal but not allowing for dissolution of the polyalkylene terephthalate based polymer, thereby obtaining a solvent system, which is enriched in colorant compared to the solvent system provided, and an extrusion product, which is depleted in colorant compared to the colored polymeric material provided in (a).

2. The process of claim 1 , wherein (b.1) or (b.2’) comprises(b.i) providing the colored polymeric material in a first vessel and providing the solvent system in a second vessel; wherein first and second vessel are arranged spatially separated from each other but allowing a gaseous and fluid communication between each other;(b.ii) forming a gaseous stream comprising at least parts of the solvent system, and removing the gaseous stream from the second vessel;(b.iii) allowing the solvent system to separate in liquid form from the gaseous stream at a position outside the second vessel (also outside the first vessel), obtaining a solvent system in liquid form;(b.iv) contacting the colored polymeric material in the first vessel with the solvent system in liquid form, which had been separated from the gaseous stream in (b.iii),thereby obtaining a solvent system, which is enriched in colorant compared to the solvent system provided in (a), and a polymeric material, which is depleted in colorant compared to the colored polymeric material provided in (a) and which comprises the polyalkylene terephthalate based polymer (i).

3. The process according to claim 1 , wherein (b.1) or (b.2’) comprises(b.i’) contacting the colored polymeric material of (a) or the colored extrusion product of (b.2) respectively with a solvent system at a temperature T, which is < 170 °C thereby obtaining a solvent system, which is enriched in colorant compared to the solvent system provided in (a), and a polymeric material, which is depleted in colorant compared to the colored polymeric material provided in (a);(b.ii’) optionally separating the polymeric material or the extrusion product respectively, which is depleted in colorant.

4. The process of any one of claims 1 to 3, wherein the extrusion in (b.2) comprises(b.2.1) extrusion of melted polymeric material, which is depleted in colorant, obtained in (b.1), thereby obtaining an extrudate;(b.2.2) pelletizing the extrudate obtained in (b.2.1), thereby obtaining an extrusion product, which is depleted in colorant compared to the colored polymeric material provided in (a); and / or wherein the extrusion in (b.T) comprises(b.1’.1) extrusion of melted colored polymeric material provided in (a), thereby obtaining a colored extrudate;(b.T.2) pelletizing the colored extrudate obtained in (b.1’.1), thereby obtaining a colored extrusion product.

5. The process of any one of claims 1 to 4, wherein the extrusion product, which is depleted in colorant compared to the colored polymeric material provided in (a) obtained in (b.2) or (b.2’) respectively, is further processed to give a polymer product, preferably by melt-spinning extrusion, wherein the polymer product is preferably a fiber.

6. The process of any one of claims 1 to 4, wherein the extrusion product, which is depleted in colorant compared to the colored polymeric material provided in (a) obtained in (b.2) or (b.2’) respectively, is further processed to give a polymer product, preferably by melt-blow extrusion; wherein the melt-blow extrusion is preferably an injection stretch blow moldingor an extrusion blow molding; wherein the polymer product is preferably a three-dimensional hollow body, more preferably a bottle.

7. The process of any one of claims 1 to 6, wherein the polyalkylene terephthalate based polymer consists of either oxyethylen units or oxybutylen units and oxyterephthaloyl units, wherein in case of oxyethylen units, in the range of from 0 to 5 mol-% of the oxyterephthaloyl units are replaced by oxyisophthaloyl units and / or in the range of from 0 to 49 mol- % of the oxyethylen units are replaced by oxymethylene cyclohexylene methylene units; wherein more preferably, the polyalkylene terephthalate based polymer comprises PET (polyethylene terephthalate), PETI (poly(ethylene terephthalate-co-isophthalate)), PBT (polybutylene terephthalate), and mixtures of two or three of these polymers; wherein more preferably the polyalkylene terephthalate based polymer comprises or is PET.

8. The process of any one of claims 1 to 7, wherein the colored polymeric material derives from a bottle and / or a textile.

9. Process according to any one of claims 1 to 8, comprising converting the separated further polymer (iii) obtainable by or obtained by the process of the first aspect, preferably the separated further polymer (iii) obtained or obtainable from step (b.1) after separation from the solvent system, to obtain one or more monomer, polymer or polymer product; wherein preferably the polymer is and / or the polymer product comprises polyamide (PA); preferably PA 6 or PA 66; polyisocyanate polyaddition product; preferably polyurethane (Pll), thermoplastic polyurethane (TPU), polyurea or polyisocyanurate (PIR); low-density polyethylene (LDPE), high-density polyethylene (HDPE), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polyvinyl acetate (PVA), polystyrene (PS), poly acrylonitrile butadiene styrene (ABS), poly styrene acrylonitrile (SAN), poly acrylate styrene acrylonitrile (ASA), polytetrafluoroethylene (PTFE), poly(methyl acrylate) (PMA), poly(methyl methacrylate) (PMMA), polybutadiene (BR, PBD), poly(cis-1 ,4-iso- prene), poly(trans-1 ,4-isoprene), polyoxymethylene (POM), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polybutylene adipate coterephthalate (PBAT), polyester (PES), polyether sulfone (PESLI), polyhydroxyalkanoate (PHA), poly-3-hydroxybutyrate (P3HB), poly-4-hydroxybutyrate (P4HB), polyhydroxyvalerate (PHV), polyhydroxyhexanoate (PHH), polyhydroxyoctanoate (PHO), polylactic acid (PLA), polysulfone (PSU), polyphenylene sulfone (PPSLI), polycarbonate (PC), polyether ether ketone (PEEK), poly(p-phenylene oxide) (PPO), poly(p-phenylene ether) (PPE); or copolymer or mixture thereof.

10. Process according to claim 9, wherein the extrusion product and / or the polymer and / or the polymer product is / are or is / are a part of: a part of a car; preferably cylinder head cover, engine cover, housing for charge air cooler, charge air cooler flap, intake pipe, intake manifold, connector, gear wheel, fan wheel, cooling water box, housing, housing part for heat exchanger, coolant cooler, charge air cooler, thermostat, water pump, radiator, fastening part, part of battery system for electromobility, dashboard, steering column switch, seat, headrest, center console, transmission component, door module, A, B, C or D car pillar cover, spoiler, door handle, exterior mirror, windscreen wiper, windscreen wiper protection housing, decorative grill, cover strip, roof rail, window frame, sunroof frame, antenna panel, headlight and taillight, engine cover, cylinder head cover, intake manifold, airbag, cushion, or coating; a cloth; preferably shirt, trousers, pullover, boot, shoe, shoe sole, tight or jacket; an electrical part; preferably electrical or electronic passive or active component, circuit board, printed circuit board, housing component, foil, line, switch, plug, socket, distributor, relay, resistor, capacitor, inductor, bobbin, lamp, diode, LED, transistor, connector, regulator, integrated circuit (IC), processor, controller, memory, sensor, microswitch, microbutton, semiconductor, reflector housing for light-emitting diodes (LED), fastener for electrical or electronic component, spacer, bolt, strip, slide-in guide, screw, nut, film hinge, snap hook (snap-in), or spring tongue; a consumer, agricultural product or pharmaceutical product; preferably tennis string, climbing rope, bristle, brush, artificial grass, 3D printing filament, grass trimmer, zipper, hook and loop fastener, paper machine clothing, extrusion coating, fishing line, fishing net, offshore line and rope, vial, syringe, ampoule, bottle, sliding element, spindle nut, chain conveyor, plain bearing, roller, wheel, gear, roller, ring gear, screw and spring dampers, hose, pipeline, cable sheathing, socket, switch, cable tie, fan wheel, carpet, box or bottle for cosmetics, mattress, cushion, insulation, detergent, dishwasher tabs or powder, shampoo, body wash, shower gel, soap, fertilizer, fungicide, or pesticide; a packaging for the food industry; preferably mono- or multi-layer blown film, cast film (mono- or multi-layer), biaxially stretched film, or laminating film; or a part of a construction; preferably a rotor blade, insulating material, frame, housing, wall, coating, or separating wall.11 . Extrusion product, obtainable or obtained from a process of any one of claims 1 to 10, preferably from any one of claims 1 to 8.

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