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Title:
PRODUCTION METHOD FOR POLYESTER RESIN COMPOSITION, REGENERATION METHOD FOR RECOVERED POLYESTER RESIN, AND POLYESTER RESIN COMPOSITION
Document Type and Number:
WIPO Patent Application WO/2024/038815
Kind Code:
A1
Abstract:
[Problem] To provide a method for producing a polyester resin composition that is less susceptible to discoloration or a decrease in molecular weight even when recycled multiple times from a used polyester resin produced using at least one compound selected from among antimony compounds, titanium compounds and germanium compounds as a polymerization catalyst. [Solution] A production method for a polyester resin composition (C) which includes a step in which a recovered polyester resin (A) and a polyester resin (B) containing an aluminum compound and a phosphorus compound are mixed together, wherein the polyester resin (A) satisfies (1) to (3), and the polyester resin (B) satisfies (4). (1) The polyester resin (A) contains at least one element selected from among antimony, titanium and germanium. (2) The total content of elemental antimony, elemental titanium and elemental germanium in the polyester resin (A) is 2-500 mass ppm. (3) The intrinsic viscosity of the polyester resin (A) is 0.5-0.8 dl/g. (4) The polyester resin (B) is obtained by polycondensing a starting material which contains bis-2-hydroxyethyl terephthalate obtained by breaking down a polyester resin.

Inventors:
SASAI TAMAYO (JP)
YAMAMOTO YU (JP)
SHIBANO HIROSHI (JP)
Application Number:
PCT/JP2023/029132
Publication Date:
February 22, 2024
Filing Date:
August 09, 2023
Export Citation:
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Assignee:
TOYO BOSEKI (JP)
International Classes:
C08L67/00; C08G63/183
Domestic Patent References:
WO2007141866A12007-12-13
Foreign References:
JP2011256328A2011-12-22
JP2002249650A2002-09-06
JP2002249558A2002-09-06
JP2006169432A2006-06-29
JP2003306536A2003-10-31
JP2008030370A2008-02-14
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