Thermoplastic resin composition and molded article

A thermoplastic resin composition with specific recycled polycarbonate and polyethylene terephthalate resins, combined with a phosphorus-based stabilizer, addresses heat resistance and recyclability issues, ensuring high stability and minimal defects for diverse applications.

JP2026085943APending Publication Date: 2026-05-26TEIJIN LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
TEIJIN LTD
Filing Date
2024-11-14
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing thermoplastic resin compositions containing recycled polycarbonate and polyethylene terephthalate resins face challenges in maintaining heat resistance, thermal stability, and recyclability, with issues such as transparency loss and foreign matter contamination.

Method used

A thermoplastic resin composition comprising specific recycled polycarbonate and polyethylene terephthalate resins, along with a phosphorus-based stabilizer, is formulated to maintain high levels of heat resistance, thermal stability, and recyclability, with controlled ashing residue, weight loss temperature, and intrinsic viscosity values.

Benefits of technology

The composition achieves excellent heat resistance, thermal stability, and recyclability, suitable for various applications including electrical and automotive components, while minimizing defects.

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Abstract

To enable the use of thermoplastic resin compositions containing recycled polycarbonate resin and recycled polyethylene terephthalate resin without degrading properties such as heat resistance, thermal stability, recyclability, and defects. [Solution] A thermoplastic resin mixture containing (A) 100 parts by weight of polycarbonate resin (component A) consisting of 1 to 99% by weight of recycled polycarbonate resin (A-1) and 99% to 1% by weight of non-recycled polycarbonate resin (A-2), (B) 1 to 100 parts by weight of polyethylene terephthalate resin (component B) consisting of 0 to 100% by weight of recycled polyethylene terephthalate resin (B-1) and 100% to 0% by weight of non-recycled polyethylene terephthalate resin (B-2), and (C) 0.001 to 2 parts by weight of phosphorus-based stabilizer (component C). A thermoplastic resin composition wherein component (A-1) has an ashing residue of 0 to 0.4% by weight after 3 hours at 600°C, and a 5% weight loss temperature measured under a temperature increase of 20°C / min in a nitrogen atmosphere is 405°C to 505°C; and component (B-1) has an intrinsic viscosity (IV) value of 0.5 to 0.9 measured at 25°C, an ashing residue of 0 to 0.3% by weight after 3 hours at 600°C, and a 5% weight loss temperature measured under a temperature increase of 20°C / min is 405°C to 440°C, and the amount of terephthalic acid ester quantified from the peak area by NMR measurement is 0.0% by weight or more and 5.0% by weight or less.
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