Method for recovering polycarbonate recycling material from polycarbonate-containing waste

Abstract

The invention relates to a method for recovering polycarbonate recycling material from polycarbonate-containing waste, in particular from polycarbonate-containing medical and / or laboratory waste, the recovery comprising the following steps: I) sterilizing, comminuting and washing the polycarbonate-containing waste to obtain a polycarbonate-containing material mixture, the sterilization, comminution and / or washing being carried out at a temperature of 120-200°C and a pressure of 1.5-15 bar; II) sorting the polycarbonate-containing material mixture according to the polycarbonate components to obtain the polycarbonate recycling material; III) optionally further processing the polycarbonate recycling material; wherein the melt volume-flow rate MVR of the polycarbonate recycling material is 0.0-50.0% higher than that of the polycarbonate starting material of the polycarbonate-containing waste, and wherein the melt volume-flow rate MVR is determined at 300°C using a test weight of 1.2 kg according to DIN ISO 1133-1:2022.

Description

[0001] Process for obtaining polycarbonate recycling material from polycarbonate-containing waste

[0002] The present invention relates to a process for obtaining polycarbonate recycling material from polycarbonate-containing waste, in particular from polycarbonate-containing medical and / or laboratory waste, the polycarbonate recycling material obtained or obtainable by this process and its use.

[0003] State of the art

[0004] Recycling (also known as waste recovery) represents an interesting opportunity to conserve resources and reduce environmental impact. For the aforementioned reasons, as well as for cost reasons and regulatory requirements, more and more companies in the "Life Science" and "Health Care" sectors are striving to reduce their emissions, particularly Scope 3 emissions that occur at the end of the product life cycle. Recycling concepts are therefore desirable in these areas as well. Recycling involves the extraction of so-called secondary raw materials (also known as recyclates) from waste, which can then be used in a wide variety of applications.However, it is important that the resulting recyclates have usable material properties and meet the regulatory requirements of REACH (EC 1907 / 2006) with regard to the proportion of hazardous substances and substances of very high concern (SVHC) for use as a new product, so that they can also be used again as starting material for further processing.

[0005] However, most waste from the life science / healthcare sector (e.g., medical and laboratory products) is still incinerated today. This is because it is subject to strict regulatory requirements in many countries. This is particularly true for infectious waste. A large proportion of medical and laboratory waste, however, is only partially contaminated. However, even this waste is predominantly disposed of in incineration plants. However, this aforementioned waste often contains products whose materials / raw materials could be returned to the recycling cycle after decontamination, albeit in other applications. One of these materials / raw materials, which is frequently used in large quantities in medical and laboratory products, is aromatic polycarbonate.

[0006] There is therefore a need for a process with which polycarbonate can be obtained from polycarbonate-containing waste, in particular from polycarbonate-containing medical and / or laboratory waste, whereby the resulting recyclate continues to have 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 another application, for example outside of medical technology.

[0007] Object of the invention

[0008] The object of the present invention was therefore to provide a process for obtaining polycarbonate recycling material from polycarbonate-containing waste, in particular from polycarbonate-containing medical and / or laboratory waste. In particular, the resulting polycarbonate recycling material should be decontaminated and retain good material properties, thus enabling it to be recycled.

[0009] Solution to the problem and detailed description of the invention

[0010] The problem was solved by a process for obtaining polycarbonate recycling material from polycarbonate-containing waste, in particular from polycarbonate-containing medical and / or laboratory waste, wherein the extraction comprises the following steps:

[0011] I) sterilizing, comminuting and washing the polycarbonate-containing waste to obtain a polycarbonate-containing material mixture, wherein the sterilization, comminution and / or washing is carried out at a temperature of 120 to 200 °C and a pressure of 1.5 to 15 bar;

[0012] II) Sorting the polycarbonate-containing material mixture according to the polycarbonate components to obtain the polycarbonate recycling material;

[0013] III) Optionally, further processing of the polycarbonate recycling material; whereby the melt volume flow rate (MVR) of the polycarbonate recycling material is 0.0 to 50.0% higher than that of the polycarbonate starting material of the polycarbonate-containing waste, whereby the melt volume flow rate (MVR) is determined at 300 °C with a test weight of 1.2 kg in accordance with DIN ISO 1133-1:2022.

[0014] In the course of the development work leading to the present invention, it was surprisingly discovered that using the aforementioned steps to obtain polycarbonate from polycarbonate-containing waste results in decontaminated recyclates with good material properties. The resulting polycarbonate recycling material can therefore be used as a starting material for various applications. Thus, the polycarbonate-containing waste no longer needs to be disposed of by incineration, significantly improving the emissions and environmental footprint of the polycarbonate material.

[0015] For the purposes of the invention, polycarbonate-containing medical and / or Eabor waste is understood to mean waste that originates from human or veterinary medical care and research in accordance with the European Waste Catalogue AW 18 (List of Waste Chapter 18 - WASTES FROM HUMAN OR ANIMAL HEALTH CARE AND / OR RELATED RESEARCH).

[0016] For the purposes of the invention, polycarbonate recycling material is understood to mean the polycarbonate obtained from polycarbonate-containing waste or from polycarbonate-containing medical and / or laboratory waste and by the process according to the invention. The polycarbonate recycling material preferably consists of 50.0 to 100.0 wt.% polycarbonate, more preferably 99.0 to 100.0 wt.%, based on the total weight of the polycarbonate recycling material, wherein the polycarbonate preferably comprises or consists of aromatic polycarbonate.

[0017] In addition to polycarbonate components, the polycarbonate-containing waste may also include, among other things, polysulfone fibers, labels, waste containers for transporting the contaminated waste, such as bags, boxes, bins, etc., in particular garbage bags, polypropylene components, polyurethane components, inorganic components, in particular metals, glass or mixtures thereof, thermoplastic materials, elastomeric materials and / or thermosetting materials.

[0018] The mass fraction of polycarbonate in the total weight of the polycarbonate-containing waste is preferably at least from 20.0 to 100.0 wt. %, more preferably from 20.0 to 90 wt. %, even more preferably from 30.0 to 80.0 wt. %. Furthermore, the polycarbonate constituents of the polycarbonate-containing waste preferably contain or consist of aromatic polycarbonate. "Polycarbonate" in the sense of the invention refers to both aromatic homopolycarbonates and aromatic copolycarbonates. The polycarbonates can be linear or branched in a known manner. Mixtures of polycarbonates can also be used according to the invention.

[0019] Details of the production of polycarbonates have been documented in numerous patents published over the past 40 years. Examples include Schnell, "Chemistry and Physics of Polycarbonates," Polymer Reviews, Volume 9, Interscience Publishers, New York, London, Sydney 1964; D. Freitag, U. Grigo, PR Müller, H. Nouvertne, BAYER AG, "Polycarbonates" in Encyclopedia of Polymer Science and Engineering, Volume 11, Second Edition, 1988, pages 648-718; and finally, U. Grigo, K. Kirchner, and PR Müller, "Polycarbonates" in Becker / Braun, Kunststoff-Handbuch, Volume 3 / 1, Polycarbonates, Polyacetals, Polyesters, Cellulose Esters, Carl Hanser Verlag Munich, Vienna 1992, pages 117 to 299.

[0020] The sterilization, comminution, and / or washing of the polycarbonate-containing waste in step I) preferably takes place at a temperature of 120 to 150°C, more preferably 130 to 140°C, even more preferably 134 to 138°C, and / or preferably a pressure of 1.5 to 4.0 bar, more preferably 2.5 to 3.5 bar, even more preferably 3.0 to 3.4 bar. It is also preferred that the polycarbonate-containing waste be exposed to steam, preferably water vapor, during sterilization, comminution, and / or washing. Step I) according to the invention results in the components of the resulting polycarbonate-containing material mixture not melting together and / or clumping during sterilization, comminution, and / or washing, yet being decontaminated in a process-reliable manner.

[0021] The polycarbonate-containing material mixture obtained in step I) is to be understood in such a way that the individual components do not melt together and / or clump during sterilization, comminution and / or washing despite the high temperatures close to the heat distortion temperature of polycarbonate necessary for sterilization.

[0022] The sorting of the polycarbonate-containing material mixture according to its polycarbonate components to obtain the polycarbonate recycling material can be carried out manually and / or by means of an automated sorting system, wherein the sorting by means of the automated sorting system is preferably carried out via density; sensor sorting, in particular near-infrared, mid-infrared, visual, laser-based, X-ray and / or magnetic sensor sorting; an impact reactor; air classification; electrostatic and / or a sink-float process.

[0023] Furthermore, it is preferred that the polycarbonate starting material of the polycarbonate-containing waste has a melt volume flow rate MVRp o iycarbonate waste of not more than 50 cm 3 / 10 min, preferably from 1 to 50 cm 3 / 10 min, more preferably 5 to 35 cm 3 / 10 min, determined at 300 °C with a test weight of 1.2 kg according to DIN ISO 1133-1:2022.

[0024] The melt volume flow rate MVR of the polycarbonate recycling material is preferably 0 to 40.0% higher than that of the polycarbonate starting material of the polycarbonate-containing waste, more preferably 0 to 35.0%, even more preferably 0 to 30%. Furthermore, it is preferred that the melt volume flow rate MVR of the polycarbonate recycling material is

[0025] • 0 to 20% higher than that of the polycarbonate starting material of the polycarbonate-containing waste if the polycarbonate starting material is a polycarbonate with an average molecular weight of 21,000 to 23,000 g / mol; • 0 to 25% higher than that of the polycarbonate starting material of the polycarbonate-containing waste if the polycarbonate starting material is a polycarbonate with an average molecular weight of 23,000 to 25,000 g / mol;

[0026] • 0 to 35% higher than that of the polycarbonate starting material of the polycarbonate-containing waste, if the polycarbonate starting material is a polycarbonate with an average molecular weight of 25,000 to 27,000 g / mol;

[0027] • 0 to 40% higher than that of the polycarbonate starting material of the polycarbonate-containing waste, if the polycarbonate starting material is a polycarbonate with an average molecular weight of 27,000 to 29,000 g / mol;

[0028] • and is 0 to 45% higher than that of the polycarbonate starting material of the polycarbonate-containing waste, if the polycarbonate starting material is a polycarbonate with an average molecular weight of 30,000 to 33,000 g / mol; the average molecular weight is determined in each case by means of gel permeation chromatography (GPC), calibrated against bisphenol A polycarbonate standards using dichloromethane as the eluent, calibration with linear polycarbonates (from bisphenol A and phosgene) of known molecular weight distribution from PSS Polymer Standards Service GmbH, Germany, calibration according to method 2301-0257502-09D (from 2009 in German) from Currenta GmbH & Co. OHG, Leverkusen. The eluent is dichloromethane. Column combination of cross-linked styrene-divinylbenzene resins. Diameter of the analytical columns: 7.5 mm; length: 300 mm. Particle sizes of the column material: 3 pm to 20 pm. Solution concentration: 0.2 wt.%.Flow rate: 1.0 ml / min, solution temperature: 30°C. Use of UV and / or RI detection.

[0029] The optional processing of the polycarbonate recycling material in step III) preferably comprises a melt process, in particular an extrusion, a granulation and / or a compounding of the polycarbonate recycling material.

[0030] Furthermore, the invention relates to a polycarbonate recycling material obtained or obtainable by the process according to the invention.

[0031] Finally, the invention also relates to the use of the polycarbonate recycling material according to the invention in or as granules, film, sheet, and / or filaments, particularly in the automotive industry, electrical industry, furniture industry, and / or medical technology. Embodiments:

[0032] The invention particularly relates to the following embodiments:

[0033] According to a first embodiment, the invention relates to a process for obtaining polycarbonate recycling material from polycarbonate-containing waste, in particular from polycarbonate-containing medical and / or laboratory waste, wherein the extraction comprises the following steps:

[0034] I) sterilizing, comminuting and washing the polycarbonate-containing waste to obtain a polycarbonate-containing material mixture, wherein the sterilization, comminution and / or washing is carried out at a temperature of 120 to 200 °C and a pressure of 1.5 to 15 bar;

[0035] II) Sorting the polycarbonate-containing material mixture according to the polycarbonate components to obtain the polycarbonate recycling material;

[0036] III) Optionally, further processing of the polycarbonate recycling material; whereby the melt volume flow rate (MVR) of the polycarbonate recycling material is 0.0 to 50.0% higher than that of the polycarbonate starting material of the polycarbonate-containing waste, whereby the melt volume flow rate (MVR) is determined at 300 °C with a test weight of 1.2 kg in accordance with DIN ISO 1133-1:2022.

[0037] According to a second embodiment, the invention relates to a method according to the first embodiment, characterized in that the polycarbonate-containing waste comprises, in addition to polycarbonate components, polysulfone fibers; labels; waste containers for transporting the contaminated waste, in particular garbage bags; polypropylene components; polyurethane components; inorganic components, in particular metals, glass or mixtures thereof; thermoplastic materials; elastomeric materials; and / or thermosetting materials.

[0038] According to a third embodiment, the invention relates to a process according to the first or second embodiment, characterized in that the mass fraction of polycarbonate in the total weight of the polycarbonate-containing waste is at least from 20.0 to 100.0 wt.%, preferably from 20.0 to 90 wt.%, more preferably from 30.0 to 80.0 wt.%.

[0039] According to a fourth embodiment, the invention relates to a process according to one of the preceding embodiments, characterized in that the polycarbonate components of the polycarbonate-containing waste contain or consist of aromatic polycarbonate.

[0040] According to a fifth embodiment, the invention relates to a method according to one of the preceding embodiments, characterized in that the sterilization, comminution and / or washing in step I) takes place at a temperature of 120 to 150 °C, preferably from 130 to 140 °C, more preferably from 134 to 138 °C and / or a pressure of 1.5 to 4.0 bar, preferably from 2.5 to 3.5 bar, more preferably from 3.0 to 3.4 bar.

[0041] According to a sixth embodiment, the invention relates to a method according to one of the preceding embodiments, characterized in that the polycarbonate-containing waste is exposed to steam, preferably water vapor, during sterilization, comminution and / or washing.

[0042] According to a seventh embodiment, the invention relates to a method according to one of the preceding embodiments, characterized in that the sorting of the polycarbonate-containing material mixture according to the polycarbonate components to obtain the polycarbonate recycling material is carried out manually and / or by means of an automated sorting system, wherein the sorting by means of the automated sorting system is preferably carried out via density; sensor sorting, in particular near-infrared, mid-infrared, visual, laser-based, X-ray and / or magnetic sensor sorting; an impact reactor; air classification; electrostatic and / or a sink-float process.

[0043] According to an eighth embodiment, the invention relates to a method according to one of the preceding embodiments, characterized in that the polycarbonate starting material of the polycarbonate-containing waste has a melt volume flow rate MVRp oiycarbonate waste of not more than 50 cm 3 / 10 min, preferably from 1 to 50 cm 3 / 10 min, more preferably 5 to 35 cm 3 / 10 min, determined at 300 °C with a test weight of 1.2 kg according to DIN ISO 1133-1:2022.

[0044] According to a ninth embodiment, the invention relates to a method according to one of the preceding embodiments, characterized in that the melt volume flow rate MVR of the polycarbonate recycling material is 0 to 40.0% higher than that of the polycarbonate starting material of the polycarbonate-containing waste, preferably 0 to 35.0%, more preferably 0 to 30%.

[0045] According to a tenth embodiment, the invention relates to a method according to one of the preceding embodiments, characterized in that the melt volume flow rate MVR of the polycarbonate recycling material is

[0046] • 0 to 20% higher than that of the polycarbonate starting material of the polycarbonate-containing waste, if the polycarbonate starting material is a polycarbonate with an average molecular weight of 21,000 to 23,000 g / mol;

[0047] 0 to 25% higher than that of the polycarbonate starting material of the polycarbonate-containing waste if the polycarbonate starting material is a polycarbonate with an average molecular weight of 23,000 to 25,000 g / mol; 0 to 35% higher than that of the polycarbonate starting material of the polycarbonate-containing waste if the polycarbonate starting material is a polycarbonate with an average molecular weight of 25,000 to 27,000 g / mol;

[0048] • 0 to 40% higher than that of the polycarbonate starting material of the polycarbonate-containing waste, if the polycarbonate starting material is a polycarbonate with an average molecular weight of 27,000 to 29,000 g / mol;

[0049] • and is 0 to 45% higher than that of the polycarbonate starting material of the polycarbonate-containing waste, if the polycarbonate starting material is a polycarbonate with an average molecular weight of 30,000 to 33,000 g / mol; the average molecular weight is determined in each case by gel permeation chromatography (GPC; eluent dichloromethane, calibration against bisphenol A polycarbonate standards).

[0050] According to an eleventh embodiment, the invention relates to a method according to one of the preceding embodiments, characterized in that the further processing comprises a melt process, in particular an extrusion, a granulation and / or a compounding of the polycarbonate recycling material.

[0051] According to a twelfth embodiment, the invention relates to a method according to one of the preceding embodiments, characterized in that the polycarbonate recycling material consists of 50.0 to 100.0 wt.% polycarbonate, preferably 99.0 to 100.0 wt.%, based on the total weight of the polycarbonate recycling material, wherein the polycarbonate preferably comprises or consists of aromatic polycarbonate.

[0052] According to a thirteenth embodiment, the invention relates to a polycarbonate recycling material obtained or obtainable by a process according to any one of embodiments one to twelve.

[0053] According to a fourteenth embodiment, the invention relates to the use of a polycarbonate recycling material according to embodiment thirteen in or as granules, film, sheet, and / or filaments, in particular in the automotive industry, electrical industry, furniture industry, and / or medical technology. Examples

[0054] The present invention is explained in more detail with reference to the following examples.

[0055] Measurement methods:

[0056] The following measurement methods were used:

[0057] Determination of the MVR:

[0058] The melt volume flow rate (MVR) was determined at 300 °C with a test weight of 1.2 kg according to DIN ISO 1133-1:2022.

[0059] Attempt 1:

[0060] Materials and equipment:

[0061] Waste containing polycarbonate:

[0062] Dialyzers (Fresenius Hemoflow F7HPS and Fresenius plasmaFlux P2 dry) with a polycarbonate housing, into which polysulfone filter fibers are embedded at the side ends using a polyurethane potting compound. The dialyzers also feature a printed label. The material composition (total 207.5 g) is as follows:

[0063] • Polycarbonate: 92 g Makrolon ® 2858 550115 (MVR(300°C / l,2 kg) = 9.0 cmVIO min) and 34 g Makrolon ® 2858 MAS020 (MVR(300°C / l,2 kg) = 9.0 cmVIO min) with average molecular weight 28,000 g / mol (together 60%);

[0064] • Polysulfone fibers; 9.5g (5%);

[0065] • Polyurethane potting compound: 72 g (35%).

[0066] Experimental procedure and results:

[0067] The waste (20 kg) was placed in the MACS 800 from EET Ermafa Environmental Technologies GmbH and sterilized, shredded, and washed (in combination) at temperatures of 136°C and pressures of 3.2 bar for 1 hour under steam. The resulting polycarbonate-containing material mixture was then manually sorted according to its polycarbonate components to obtain the polycarbonate recycling material (approximately 12 kg).

[0068] The MVR value of the resulting recycled polycarbonate material was then determined using the aforementioned method. This value was 10.3 cm 3 / 10 min and is within the process range for a polycarbonate material with an average molecular weight of 26,000–28,000 g / mol. Therefore, the resulting recycled polycarbonate material is highly suitable for further processing.

[0069] Attempt 2:

[0070] In a second series of tests, analogous to test 1, the MVR values ​​of polycarbonate samples made of Makrolon® 2405, Makrolon® 2807 and Makrolon® 3100 from Covestro AG, Leverkusen, were investigated after prior contamination with pig blood and subsequent processing according to the invention.

[0071] Materials and equipment:

[0072] Polycarbonate materials: Makrolon® 2405, Makrolon® 2807, and Makrolon® 3100 from Covestro AG, Leverkusen, in various stages of normal processing, namely:

[0073] 1. Unprocessed granules

[0074] 2. Shredded sheets after injection molding (based on the granulate from point 1)

[0075] 3. Plates contaminated with pig blood from point 2) that were sterilized and shredded.

[0076] Blood powder: Spray-dried pig blood (manufacturer: SOLINA GERMANY GmbH, Bonn) for use in the food industry, purchased from mtg-gewuerze.de

[0077] The plate-shaped test specimens with a thickness of 3.2 mm for shredding and contamination (see the processing phases 2 + 3 mentioned above) were manufactured on an injection molding machine of the type 720S from Arburg GmbH + Co KG, Loßburg, in an injection compression molding process at a melt temperature of 300 ° C, a mold temperature of 100 ° C, a filling time of 1.6 s, a holding pressure of 200 bar, a holding pressure duration of 5.5 s, a residual cooling time of 48.0 s, a compression stroke of 2.4 mm, a compression force of 1500 kN and a compression duration of 53.5 s.

[0078] To contaminate the plate-shaped test specimens (see the processing phases 3 mentioned above), the pig blood used was first prepared by mixing 1 kg of blood powder with 5 kg of lukewarm water. The test specimens were then immersed in the mixed pig blood for 1 hour. The plate-shaped test specimens contaminated with pig blood (10 kg each material) were then placed in the MACS 800 from EET Ermafa Environmental Technologies GmbH, shredded using the machine's integrated shredding unit, and washed and sterilized (in combination) at temperatures of 136°C and pressures of 3.2 bar for 1 hour under steam. The samples were then subjected to an MVR test as in Test 1.

[0079] The results are summarized in the following table and in the diagram shown in Fig. 1:

[0080] MVR(300°C / 1.2kg) [cm3 / 10 min]

[0081] Makrolon 2405 - Granules 19.1075

[0082] Makrolon 2405 - Injection molded 18.3099

[0083] Makrolon 2405 - De-contaminated 20.3809

[0084] Makrolon 2807 - Granules 10.0121

[0085] Makrolon 2807 - Injection molded 10.3598

[0086] Makrolon 2807 - Decontaminated 11.0219

[0087] Makrolon 3100 - Granules 5.4737

[0088] Makrolon 3100 - Injection molded 5.7142

[0089] Makrolon 3100 - Decontaminated 7.5778

[0090] The results show that the samples used survived the contamination with blood and the subsequent processing according to the invention without any significant molecular weight degradation.

Claims

Patent claims 1. A process for obtaining polycarbonate recycling material from polycarbonate-containing waste, in particular from polycarbonate-containing medical and / or laboratory waste, the process comprising the following steps: I) sterilizing, comminuting and washing the polycarbonate-containing waste to obtain a polycarbonate-containing material mixture, wherein the sterilization, comminution and / or washing is carried out at a temperature of 120 to 200 °C and a pressure of 1.5 to 15 bar; II) Sorting the polycarbonate-containing material mixture according to the polycarbonate components to obtain the polycarbonate recycling material; III) Optionally, further processing of the polycarbonate recycling material; whereby the melt volume flow rate (MVR) of the polycarbonate recycling material is 0.0 to 50.0% higher than that of the polycarbonate starting material of the polycarbonate-containing waste, whereby the melt volume flow rate (MVR) is determined at 300 °C with a test weight of 1.2 kg in accordance with DIN ISO 1133-1:2022.

2. Process according to claim 1, characterized in that the polycarbonate-containing waste comprises, in addition to polycarbonate components, polysulfone fibers, labels, waste containers for transporting the contaminated waste, in particular garbage bags, polypropylene components, polyurethane components, inorganic components, in particular metals, glass or mixtures thereof, thermoplastic materials, elastomeric materials and / or thermosetting materials.

3. A process according to claim 1 or 2, characterized in that the mass fraction of polycarbonate in the total weight of the polycarbonate-containing waste is at least from 20.0 to 100.0 wt.%, preferably from 20.0 to 90 wt.%, more preferably from 30.0 to 80.0 wt.%.

4. Process according to one of the preceding claims, characterized in that the polycarbonate components of the polycarbonate-containing waste contain or consist of aromatic polycarbonate.

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

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

7. Method according to one of the preceding claims, characterized in that the sorting of the polycarbonate-containing material mixture according to the polycarbonate components to obtain the polycarbonate recycling material is carried out manually and / or by means of an automated sorting system, wherein the sorting by means of the automated sorting system is preferably carried out via density; sensor sorting, in particular near-infrared, mid-infrared, visual, laser-based, X-ray and / or magnetic sensor sorting; an impact reactor; air classification, electrostatic and / or a sink-float process.

8. Process according to one of the preceding claims, characterized in that the polycarbonate starting material of the polycarbonate-containing waste has a melt volume flow rate MVRp o iycarbonate waste of not more than 50 cm 3 / 10 min, preferably from 1 to 50 cm 3 / 10 min, more preferably 5 to 35 cm 3 / 10 min, determined at 300 °C with a test weight of 1.2 kg according to DIN ISO 1133-1:2022.

9. Process according to one of the preceding claims, characterized in that the melt volume flow rate MVR of the polycarbonate recycling material is 0 to 40.0% higher than that of the polycarbonate starting material of the polycarbonate-containing waste, preferably 0 to 35.0%, more preferably 0 to 30%.

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

11. Process according to one of the preceding claims, characterized in that the further processing comprises a melting process, in particular an extrusion, a granulation and / or a compounding of the polycarbonate recycling material.

12. Process according to one of the preceding claims, characterized in that the polycarbonate recycling material consists of 50.0 to 100.0 wt.% polycarbonate, preferably 99.0 to 100.0 wt.%, based on the total weight of the polycarbonate recycling material, wherein the polycarbonate preferably comprises or consists of aromatic polycarbonate.

13. Polycarbonate recycling material obtained or obtainable by a process according to any one of claims 1 to 12.

14. Use of a polycarbonate recycling material according to claim 13 in or as granules, film, sheet and / or filaments, in particular in the automotive industry, electrical industry, furniture industry and / or medical technology.

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