Method for recovering polycarbonate regenerated material from polycarbonate-containing waste

Abstract

The invention relates to a method for recovering polycarbonate regenerated material from polycarbonate-containing waste, in particular from polycarbonate-containing medical and / or laboratory waste, said recovery comprising the following steps: I) sterilizing, comminuting and washing the polycarbonate-containing waste to obtain a polycarbonate-containing material mixture, the sterilization, crushing and / or washing is carried out at a temperature of 120 to 200 DEG C and a pressure of 1.5 to 15 bar; iI) sorting the polycarbonate-containing material mixture according to the polycarbonate component to obtain a polycarbonate regenerated material; iII) optionally further treating the polycarbonate regenerated material; wherein the polycarbonate regeneration material has a melt volume flow rate MVR higher than the melt volume flow rate MVR of the polycarbonate starting material of the polycarbonate-containing waste by 0.0-50.0%, and wherein the melt volume flow rate MVR is determined according to DIN ISO 1133-1: 2022 at 300 DEG C using a test weight of 1.2 kg.

Description

Technical Field

[0001] The present invention relates to a method for recovering polycarbonate recycled materials from polycarbonate-containing waste, in particular from polycarbonate-containing medical waste and / or laboratory waste, the polycarbonate recycled materials obtained or obtainable by the method and uses thereof. Background Art

[0002] Recycling (also known as waste recovery) is an important option for saving resources and reducing environmental impact. Generally for the reasons mentioned above and due to cost reasons and regulatory requirements, more and more companies in the life science / healthcare sector are concerned with reducing their emissions, in particular reducing scope 3 emissions generated at the end of the product life cycle, so the recycling concept is also desirable in this sector. This is because recycling recovers so-called secondary raw materials (also known as regrind) from waste, which can then be used in a very wide range of applications. However, it is important that the regrind obtained has usable material properties and meets the regulatory requirements for the content of hazardous substances and substances of very high concern (SVHC) according to REACH (EC 1907 / 2006) for use as new products, so that these regrinds can also be used as starting materials for further processing.

[0003] However, at present, waste from the life sciences / healthcare sector (e.g. medical products and laboratory products) continues to be largely incinerated. This is because these wastes are subject to strict regulatory requirements in many countries. This is particularly true for infectious waste. However, the majority of medical and laboratory waste is only partially contaminated waste. However, these wastes are also mainly sent to incineration plants for treatment. However, these wastes often contain products whose materials / raw materials can be returned to the valuable product cycle after decontamination, including in other application areas. One of these materials / raw materials that is frequently and in large quantities used in medical and laboratory products is aromatic polycarbonate.

[0004] There is therefore a need for a process which makes it possible to obtain polycarbonate from polycarbonate-containing waste, in particular from polycarbonate-containing medical waste and / or laboratory waste, wherein the regrind obtained still has good or equivalent material properties and meets the regulatory requirements according to REACH (EC 1907 / 2006) for use as a product in the same or other applications (e.g. outside the field of medical technology). Summary of the Invention

[0005] The object of the present invention is therefore to provide a method for recovering polycarbonate recycled material from polycarbonate-containing waste, in particular from polycarbonate-containing medical waste and / or laboratory waste. The polycarbonate recycled material obtained should in particular be decontaminated and furthermore exhibit good material properties so that it can be fed into the valuable product cycle. DETAILED DESCRIPTION

[0006] The problem is solved by a method for recovering polycarbonate recycled material from polycarbonate-containing waste, in particular from polycarbonate-containing medical waste and / or laboratory waste, wherein the recovery comprises the following steps:

[0007] I) sterilizing, crushing and washing the polycarbonate-containing waste to obtain a polycarbonate-containing material mixture, wherein the sterilization, crushing and / or washing is carried out at 120

[0008] ℃ to 200 ℃ and a pressure of 1.5 bar to 15 bar;

[0009] II) sorting the polycarbonate-containing material mixture according to the polycarbonate content to obtain polycarbonate recycled material;

[0010] III) optionally further processing the polycarbonate recycled material;

[0011] The melt volume flow rate MVR of the polycarbonate recycled material is 0.0% to 50.0% higher than the melt volume flow rate MVR of the polycarbonate starting material from the polycarbonate-containing waste, wherein the melt volume flow rate MVR is in each case determined in accordance with DIN ISO 1133-1:2022 at 300° C. with a test weight of 1.2 kg.

[0012] During the development of the present invention, it was surprisingly discovered that the aforementioned steps for recovering polycarbonate from polycarbonate-containing waste yield a decontaminated recycled material with excellent material properties. Consequently, the resulting polycarbonate recycled material can be used as a starting material for a variety of applications. Consequently, polycarbonate-containing waste no longer requires incineration, significantly improving the emissions and environmental balance of polycarbonate materials.

[0013] In the context of the present invention, polycarbonate-containing medical waste and / or laboratory waste is understood to mean waste originating from human or animal health care and research according to European waste list AVV18 (List of Waste Chapter 18—WASTES FROM HUMAN ORANIMAL HEALTH CARE AND / OR RELATED RESEARCH).

[0014] In the context of the present invention, "polycarbonate recyclate" is understood to mean polycarbonate recovered by the process according to the invention from polycarbonate-containing waste, i.e., from polycarbonate-containing medical waste and / or laboratory waste. The polycarbonate recyclate preferably consists of 50.0% to 100.0% by weight, more preferably 99.0% to 100.0% by weight, based on the total weight of the polycarbonate recyclate, of polycarbonate, wherein the polycarbonate preferably comprises or consists of an aromatic polycarbonate.

[0015] In addition to polycarbonate components, the polycarbonate-containing waste may also contain, in particular, polysulfone fibers, labels, waste containers for transporting contaminated waste (e.g. bags, boxes, drums, etc., in particular waste bags), polypropylene components, polyurethane components, inorganic components (in particular metal, glass or mixtures thereof), thermoplastic materials, elastomeric materials and / or thermosetting materials.

[0016] In the total weight of the polycarbonate-containing waste, the mass fraction of polycarbonate is preferably at least 20.0 wt % to 100.0 wt %, more preferably 20.0 wt % to 90 wt %, and even more preferably 30.0 wt % to 80.0 wt %. In addition, the polycarbonate component of the polycarbonate-containing waste preferably comprises aromatic polycarbonates or consists of aromatic polycarbonates. In the context of the present invention, the term "polycarbonate" is understood to mean aromatic homopolycarbonates and aromatic copolycarbonates. These polycarbonates can be linear or branched in common form. According to the present invention, mixtures of polycarbonates can also be used.

[0017] Details regarding the preparation of polycarbonates have been disclosed in numerous patent documents over the past 40 years or so. Reference may be made herein, for example, to Schnell, “Chemistry and Physics of Polycarbonates”, Polymer Reviews, Vol. 9, Interscience Publishers, New York, London, Sydney 1964; to D. Freitag, U. Grigo, P. R. Müller, H. Nouvertne, BAYER AG, in the “Polycarbonates” in Encyclopedia of Polymer Science and Engineering, Vol. 11, 2nd edition, 1988, pp. 648-718; and finally to U. Grigo, K. Kirchner and P. R. Müller, in the “Polycarbonates” in Becker / Braun, Kunststoff-Handbuch, Vol. 3 / 1, Polycarbonate, Polyacetale, Polyester, Celluloseester, Carl Hanser Verlag Munich, Vienna, 1992, pp. 117-299.

[0018] The sterilization, comminution, and / or washing of the polycarbonate-containing waste in step I) is preferably carried out at a temperature of 120° C. to 150° C., more preferably 130° C. to 140° C., even more preferably 134° C. to 138° C., and / or at a pressure of preferably 1.5 bar to 4.0 bar, more preferably 2.5 bar to 3.5 bar, even more preferably 3.0 bar to 3.4 bar. It is also preferred that the polycarbonate-containing waste is exposed to steam, preferably water vapor, during the sterilization, comminution, and / or washing. Step I) of the present invention ensures that the components of the resulting polycarbonate-containing material mixture do not melt together and / or clump together during the sterilization, comminution, and / or washing, but are nevertheless reliably decontaminated.

[0019] The polycarbonate-containing material mixture obtained in step I) is understood to mean that the individual components do not melt together and / or agglomerate during the sterilization, comminution and / or washing, despite the high temperatures necessary for sterilization, which are close to the heat distortion temperature of polycarbonate.

[0020] Sorting of a polycarbonate-containing material mixture according to the polycarbonate composition to obtain polycarbonate recycled material can be carried out manually and / or using automated sorting equipment, wherein sorting using automated sorting equipment is preferably achieved by the following means: density; sensor-based sorting, in particular near-infrared, mid-infrared, visible light, laser-based, X-ray-based and / or magnetic sensor-based sorting; impact reactor; wind sorting by electrostatic device and / or by floating and sinking process.

[0021] Further preferably, the melt volume flow rate MVR of the polycarbonate starting material of the polycarbonate-containing waste is 聚碳酸酯废弃物 Up to 50cm 3 / 10min, preferably 1 to 50cm 3 / 10min, more preferably 5 to 35cm 3 / 10 min, determined at 300° C. with a test weight of 1.2 kg in accordance with DIN ISO 1133-1:2022.

[0022] The melt volume flow rate MVR of the polycarbonate recycled material is preferably 0% to 40.0% higher, more preferably 0% to 35.0% higher, and even more preferably 0% to 30% higher than the melt volume flow rate MVR of the polycarbonate starting material containing polycarbonate waste. More preferably,

[0023] When the polycarbonate starting material of the polycarbonate-containing waste is a polycarbonate having an average molecular weight of 21,000 to 23,000 g / mol, the melt volume flow rate (MVR) of the polycarbonate recycled material is 0% to 20% higher than the melt volume flow rate (MVR) of the polycarbonate starting material;

[0024] When the polycarbonate starting material of the polycarbonate-containing waste is a polycarbonate having an average molecular weight of 23,000 to 25,000 g / mol, the melt volume flow rate (MVR) of the polycarbonate recycled material is 0% to 25% higher than the melt volume flow rate (MVR) of the polycarbonate starting material;

[0025] When the polycarbonate starting material of the polycarbonate-containing waste is a polycarbonate having an average molecular weight of 25,000 to 27,000 g / mol, the melt volume flow rate (MVR) of the polycarbonate recycled material is 0% to 35% higher than the melt volume flow rate (MVR) of the polycarbonate starting material;

[0026] When the polycarbonate starting material of the polycarbonate-containing waste is a polycarbonate having an average molecular weight of 27,000 to 29,000 g / mol, the melt volume flow rate (MVR) of the polycarbonate recycled material is 0% to 40% higher than the melt volume flow rate (MVR) of the polycarbonate starting material;

[0027] When the polycarbonate starting material of the polycarbonate-containing waste is a polycarbonate having an average molecular weight of 30,000 to 33,000 g / mol, the melt volume flow rate (MVR) of the polycarbonate recycled material is 0% to 45% higher than the melt volume flow rate (MVR) of the polycarbonate starting material;

[0028] The average molecular weights stated were determined by gel permeation chromatography (GPC) calibrated against bisphenol A polycarbonate standards using dichloromethane as the eluent and a linear polycarbonate (composed of bisphenol A and phosgene) of known molar mass distribution from PSS Polymer Standards Service GmbH, Germany; calibration according to method 2301-0257502-09D (German version 2009) from Currenta GmbH & Co. OHG, Leverkusen. The eluent was dichloromethane. The column was a crosslinked styrene-divinylbenzene resin. The analytical column had a diameter of 7.5 mm and a length of 300 mm. The particle size of the column material was 3 to 20 μm. The solution concentration was 0.2 wt %. The flow rate was 1.0 ml / min and the solution temperature was 30° C. UV and / or RI detection was used.

[0029] The optional processing of the polycarbonate recyclate in step III) preferably comprises melt processing of the polycarbonate recyclate, in particular extrusion, pelletizing and / or compounding.

[0030] The present invention also relates to polycarbonate recycled material obtained or obtainable by the process according to the invention.

[0031] Finally, the present invention also relates to the use of the polycarbonate recyclate according to the invention for or as pellets, films, sheets and / or yarns, in particular in the automotive industry, the electrical and electronics industry, the furniture industry and / or medical technology.

[0032] Implementation plan:

[0033] The present invention relates in particular to the following embodiments:

[0034] In a first embodiment, the present invention relates to a method for recovering polycarbonate recycled material from polycarbonate-containing waste, in particular from polycarbonate-containing medical waste and / or laboratory waste, wherein the recovery comprises the following steps:

[0035] I) sterilizing, crushing and washing the polycarbonate-containing waste to obtain a polycarbonate-containing material mixture, wherein the sterilization, crushing and / or washing is carried out at 120

[0036] ℃ to 200 ℃ and a pressure of 1.5 bar to 15 bar;

[0037] II) sorting the polycarbonate-containing material mixture according to the polycarbonate content to obtain polycarbonate recycled material;

[0038] III) optionally further processing the polycarbonate recycled material;

[0039] The melt volume flow rate MVR of the polycarbonate recycled material is 0.0% to 50.0% higher than the melt volume flow rate MVR of the polycarbonate starting material from the polycarbonate-containing waste, wherein the melt volume flow rate MVR is in each case determined in accordance with DIN ISO 1133-1:2022 at 300° C. with a test weight of 1.2 kg.

[0040] In a second embodiment, the invention relates to a method according to the first embodiment, characterized in that the polycarbonate-containing waste contains not only polycarbonate components, but also polysulfone fibers, labels, waste containers for transporting contaminated waste (especially waste bags), polypropylene components, polyurethane components, inorganic components (especially metal, glass or mixtures thereof), thermoplastic materials, elastomeric materials and / or thermosetting materials.

[0041] In a third embodiment, the present invention relates to a method according to the first or second embodiment, characterized in that the mass fraction of polycarbonate is at least 20.0% by weight to 100.0% by weight, preferably 20.0% by weight to 90.0% by weight, more preferably 30.0% by weight to 80.0% by weight, based on the total weight of the polycarbonate-containing waste.

[0042] In a fourth embodiment, the invention relates to a method according to any of the preceding embodiments, characterized in that the polycarbonate fraction of the polycarbonate-containing waste comprises or consists of aromatic polycarbonate.

[0043] In a fifth embodiment, the present invention relates to a method according to any one of the preceding embodiments, characterized in that the sterilization, comminution and / or washing in step I) is carried out at a temperature of 120°C to 150°C, preferably 130°C to 140°C, more preferably 134°C to 138°C and / or at a pressure of 1.5 bar to 4.0 bar, preferably 2.5 bar to 3.5 bar, more preferably 3.0 bar to 3.4 bar.

[0044] In a sixth embodiment, the invention relates to a method according to any of the preceding embodiments, characterized in that the polycarbonate-containing waste is exposed to steam, preferably water steam, during said sterilization, comminution and / or washing.

[0045] In a seventh embodiment, the present invention relates to a method according to any one of the preceding embodiments, characterized in that sorting of a polycarbonate-containing material mixture according to the polycarbonate component to obtain polycarbonate recycled material is performed manually and / or using automated sorting equipment, wherein sorting using automated sorting equipment is preferably achieved by: density; sensor-based sorting, in particular near-infrared, mid-infrared, visible light, laser-based, X-ray-based and / or magnetic sensor-based sorting; impact reactor; wind sorting by electrostatic device and / or by floating and sinking process.

[0046] In an eighth embodiment, the present invention relates to a method according to any one of the preceding embodiments, characterized in that the melt volume flow rate MVR of the polycarbonate starting material of the polycarbonate-containing waste is 聚碳酸酯废弃物 Up to 50cm 3 / 10min, preferably 1 to 50cm 3 / 10min, more preferably 5 to 35cm 3 / 10 min, determined at 300° C. with a test weight of 1.2 kg in accordance with DIN ISO 1133-1:2022.

[0047] In a ninth embodiment, the present invention relates to a method according to any one of the preceding embodiments, characterized in that the melt volume flow rate MVR of the polycarbonate recycled material is 0% to 40.0% higher, more preferably 0% to 35.0% higher, and even more preferably 0% to 30% higher than the melt volume flow rate MVR of the polycarbonate starting material from polycarbonate-containing waste.

[0048] In a tenth embodiment, the present invention relates to a method according to any one of the preceding embodiments, characterized in that

[0049] When the polycarbonate starting material of the polycarbonate-containing waste is a polycarbonate having an average molecular weight of 21,000 to 23,000 g / mol, the melt volume flow rate (MVR) of the polycarbonate recycled material is 0% to 20% higher than the melt volume flow rate (MVR) of the polycarbonate starting material;

[0050] When the polycarbonate starting material of the polycarbonate-containing waste is a polycarbonate having an average molecular weight of 23,000 to 25,000 g / mol, the melt volume flow rate (MVR) of the polycarbonate recycled material is 0% to 25% higher than the melt volume flow rate (MVR) of the polycarbonate starting material;

[0051] When the polycarbonate starting material of the polycarbonate-containing waste is a polycarbonate having an average molecular weight of 25,000 to 27,000 g / mol, the melt volume flow rate (MVR) of the polycarbonate recycled material is 0% to 35% higher than the melt volume flow rate (MVR) of the polycarbonate starting material;

[0052] When the polycarbonate starting material of the polycarbonate-containing waste is a polycarbonate having an average molecular weight of 27,000 to 29,000 g / mol, the melt volume flow rate (MVR) of the polycarbonate recycled material is 0% to 40% higher than the melt volume flow rate (MVR) of the polycarbonate starting material;

[0053] When the polycarbonate starting material of the polycarbonate-containing waste is a polycarbonate having an average molecular weight of 30,000 to 33,000 g / mol, the melt volume flow rate (MVR) of the polycarbonate recycled material is 0% to 45% higher than the melt volume flow rate (MVR) of the polycarbonate starting material;

[0054] The average molecular weights stated therein were determined in each case by gel permeation chromatography (GPC; eluent dichloromethane, calibration against bisphenol A polycarbonate standards).

[0055] In an eleventh embodiment, the invention relates to a method according to any of the preceding embodiments, characterized in that the further processing comprises melt processing of the polycarbonate recycled material, in particular extrusion, pelletizing and / or compounding.

[0056] In a twelfth embodiment, the present invention relates to a method according to any of the preceding embodiments, characterized in that the polycarbonate recycled material consists of 50.0% to 100.0% by weight, preferably 99.0% to 100.0% by weight, of polycarbonate, based on the total weight of the polycarbonate recycled material, wherein the polycarbonate preferably contains aromatic polycarbonate or consists of aromatic polycarbonate.

[0057] In a thirteenth embodiment, the present invention relates to a polycarbonate recycled material obtained or obtainable by the method according to any one of embodiments one to twelve.

[0058] In a fourteenth embodiment, the present invention relates to the use of the polycarbonate recycled material according to embodiment thirteen for or as pellets, films, sheets and / or yarns, in particular in the automotive industry, the electrical and electronics industry, the furniture industry and / or medical technology.

[0059] Example

[0060] The present invention will be more specifically explained with reference to the following examples.

[0061] Measurement method:

[0062] Use the following measurement method:

[0063] MVR determination :

[0064] The melt volume flow rate (MVR) was determined in each case to DIN ISO 1133-1:2022 at 300° C. with a test weight of 1.2 kg.

[0065] Experiment 1:

[0066] Materials and instruments:

[0067] Waste containing polycarbonate:

[0068] The dialyzers (Fresenius Hemoflow F7HPS and FreseniusplasmaFlux P2 dry) had a polycarbonate housing in which polysulfone filter fibers were embedded at the side using a polyurethane potting compound. The dialyzers also had printed labels. The material composition (total 207.5 g) was as follows:

[0069] Polycarbonate: 92g 2858 550115(MVR(300℃ / 1.2kg)

[0070] =9.0cm 3 / 10min) and 34g 2858MAS020(MVR

[0071] (300℃ / 1.2kg)=9.0cm 3 / 10min), with an average molecular weight of 28000 g / mol (total 60%);

[0072] Polysulfone fiber 9.5g (5%);

[0073] • Polyurethane potting compound: 72 g (35%).

[0074] Experimental steps and results:

[0075] The waste (20 kg) was placed in a MACS800 from EET Ermafa Environmental Technologies GmbH and exposed to steam at a temperature of 136° C. and a pressure of 3.2 bar for 1 hour for sterilization, comminution, and washing (combined). The resulting polycarbonate-containing material mixture was then manually sorted according to the polycarbonate content to obtain polycarbonate recycled material (approximately 12 kg).

[0076] The MVR value of the obtained polycarbonate recycled material was then measured by the above method. The value was 10.3 cm 3 The obtained polycarbonate recycled material is very suitable for further processing.

[0077] Experiment 2:

[0078] In a second series of experiments, similar to Experiment 1, Covestro AG, Leverkusen 2405, 2807 and The MVR values ​​of polycarbonate samples made of 3100 were measured after they were previously contaminated with porcine blood and then treated according to the present invention.

[0079] Materials and instruments:

[0080] In each case by Covestro AG, Leverkusen 2405, 2807 and 3100 Made of polycarbonate material At different stages of the conventional processing, namely:

[0081] 1. Unprocessed pellets

[0082] 2. Crushed injection molded tablets (based on pellets from 1)

[0083] 3. Pieces from 2 contaminated with pig blood, sterilized and crushed.

[0084] Blood powder: Spray-dried porcine blood for the food industry (manufacturer: SOLINA GERMANY GmbH, Bonn), obtained from mtg-gewuerze.de.

[0085] The preparation of 3.2 mm thick sheet test specimens for crushing and contamination (see above-mentioned processing stages 2+3) was carried out on a 720S injection molding machine from Arburg GmbH+Co KG, Loβburg using the following injection molding process: melt temperature 300°C, mold temperature 100°C, filling time 1.6 seconds, holding pressure 200 bar, holding pressure duration 5.5 seconds, residual cooling time 48.0 seconds, molding path 2.4 mm, molding force 1500 kN, molding duration 53.5 seconds.

[0086] To contaminate the sheet test specimens (see process stage 3 above), porcine blood was first prepared by mixing 1 kg of blood powder with 5 kg of lukewarm water. The test specimens were then placed in the prepared porcine blood for one hour. The porcine blood-contaminated sheet test specimens (10 kg of each material in each case) were then placed in a MACS 800 instrument from EET Ermafa Environmental Technologies GmbH, pulverized using the pulverizer unit integrated into the machine, and washed and sterilized (in combination) by exposure to steam at a temperature of 136° C. and a pressure of 3.2 bar for one hour.

[0087] The samples were then tested for MVR values ​​as in Experiment 1. The results are summarized in the table below and in the graph of Figure 1:

[0088]

[0089] The results indicate that the samples employed were subjected to blood contamination and subsequently processed according to the present invention without significant molecular weight degradation.

Claims

1. A method for recovering polycarbonate recycled material from polycarbonate-containing waste, in particular from polycarbonate-containing medical waste and / or laboratory waste, wherein the recovery comprises the following steps: I) sterilizing, pulverizing and washing the polycarbonate-containing waste to obtain a polycarbonate-containing material mixture, wherein the sterilization, pulverizing and / or washing is performed at a temperature of 120° C. to 200° C. and a pressure of 1.5 bar to 15 bar; II) sorting the polycarbonate-containing material mixture according to the polycarbonate content to obtain polycarbonate recycled material; III) optionally further processing the polycarbonate recycled material; The melt volume flow rate MVR of the polycarbonate recycled material is 0.0% to 50.0% higher than the melt volume flow rate MVR of the polycarbonate starting material from the polycarbonate-containing waste, wherein the melt volume flow rate MVR is in each case determined in accordance with DIN ISO 1133-1:2022 at 300° C. with a test weight of 1.2 kg.

2. The method according to claim 1, characterized in that The polycarbonate-containing waste contains not only polycarbonate components but also polysulfone fibers; labels; waste containers for transporting contaminated waste, in particular waste bags; polypropylene components; polyurethane components; inorganic components, in particular metal, glass or mixtures thereof; thermoplastic materials; elastomeric materials and / or thermosetting materials.

3. The method according to claim 1 or 2, characterized in that The mass fraction of the polycarbonate is at least 20.0% to 100.0% by weight, preferably 20.0% to 90.0% by weight, more preferably 30.0% to 80.0% by weight, based on the total weight of the polycarbonate-containing waste.

4. The method according to any one of the preceding claims, characterized in that The polycarbonate fraction of the polycarbonate-containing waste comprises aromatic polycarbonate or consists of aromatic polycarbonate.

5. The method according to any one of the preceding claims, characterized in that The sterilization, pulverization and / or washing in step I) is carried out at a temperature of 120°C to 150°C, preferably 130°C to 140°C, more preferably 134°C to 138°C and / or a pressure of 1.5 bar to 4.0 bar, preferably 2.5 bar to 3.5 bar, more preferably 3.0 bar to 3.4 bar.

6. The method according to any one of the preceding claims, characterized in that The polycarbonate-containing waste is exposed to steam, preferably water steam, during said sterilization, comminution and / or washing.

7. The method according to any one of the preceding claims, characterized in that Sorting of a polycarbonate-containing material mixture according to the polycarbonate composition to obtain polycarbonate recycled material is carried out manually and / or using automated sorting equipment, wherein sorting using automated sorting equipment is preferably achieved by the following means: density; sensor-based sorting, in particular near-infrared, mid-infrared, visible light, laser-based, X-ray-based and / or magnetic sensor-based sorting; impact reactor; wind sorting by electrostatic device and / or by floating and sinking process.

8. The method according to any one of the preceding claims, characterized in that Melt volume flow rate MVR of the polycarbonate starting material of the polycarbonate-containing waste 聚碳酸酯废弃料 Up to 50cm 3 / 10min, preferably 1 to 50cm 3 / 10min, more preferably 5 to 35cm 3 / 10 min, determined at 300° C. with a test weight of 1.2 kg in accordance with DIN ISO 1133-1:2022.

9. The method according to any one of the preceding claims, characterized in that The melt volume flow rate (MVR) of the polycarbonate recycled material is 0% to 40.0% higher than the melt volume flow rate (MVR) of the polycarbonate starting material from polycarbonate-containing waste, preferably 0% to 35.0% higher, more preferably 0% to 30% higher.

10. The method according to any one of the preceding claims, characterized in that When the polycarbonate starting material of the polycarbonate-containing waste is a polycarbonate having an average molecular weight of 21,000 to 23,000 g / mol, the melt volume flow rate (MVR) of the polycarbonate recycled material is 0% to 20% higher than the melt volume flow rate (MVR) of the polycarbonate starting material; When the polycarbonate starting material of the polycarbonate-containing waste is a polycarbonate having an average molecular weight of 23,000 to 25,000 g / mol, the melt volume flow rate (MVR) of the polycarbonate recycled material is 0% to 25% higher than the melt volume flow rate (MVR) of the polycarbonate starting material; When the polycarbonate starting material of the polycarbonate-containing waste is a polycarbonate having an average molecular weight of 25,000 to 27,000 g / mol, the melt volume flow rate (MVR) of the polycarbonate recycled material is 0% to 35% higher than the melt volume flow rate (MVR) of the polycarbonate starting material; When the polycarbonate starting material of the polycarbonate-containing waste is a polycarbonate having an average molecular weight of 27,000 to 29,000 g / mol, the melt volume flow rate (MVR) of the polycarbonate recycled material is 0% to 40% higher than the melt volume flow rate (MVR) of the polycarbonate starting material; When the polycarbonate starting material of the polycarbonate-containing waste is a polycarbonate having an average molecular weight of 30,000 to 33,000 g / mol, the melt volume flow rate (MVR) of the polycarbonate recycled material is 0% to 45% higher than the melt volume flow rate (MVR) of the polycarbonate starting material; The average molecular weights stated therein were determined in each case by gel permeation chromatography (GPC; eluent: dichloromethane, calibration against bisphenol A polycarbonate standards).

11. The method according to any one of the preceding claims, characterized in that The further processing includes melt processing of the polycarbonate recyclate, in particular extrusion, pelletizing and / or compounding.

12. The method according to any one of the preceding claims, characterized in that The polycarbonate recycled material consists of 50.0% to 100.0% by weight of polycarbonate, preferably 99.0% to 100.0% by weight of polycarbonate, based on the total weight of the polycarbonate recycled material, wherein the polycarbonate preferably comprises or consists of aromatic polycarbonate.

13. Polycarbonate recycled material obtained or obtainable by the process as claimed in any one of claims 1 to 12.

14. Use of the polycarbonate recyclate according to claim 13 for or as pellets, films, sheets and / or yarns, in particular in the automotive industry, the electrical and electronics industry, the furniture industry and / or medical technology.

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