公开(公告)号：US20250122344A1

公开(公告)日：2025-04-17

申请号：US18694605

申请日：2022-09-22

Applicant: TOYOBO CO., LTD.

Inventor： Hironao SASAKI ,  Yosuke HATANAKA ,  Keiichiro TOGAWA

IPC: C08G81/02

Abstract: An object of the invention is to provide a polyester resin with highly reduced gelation, in addition to high moldability, surface smoothness, transparency, mechanical properties, heat resistance, thermal oxidative degradation stability, and chemical resistance. A polyester resin comprising a constituent moiety derived from terephthalic acid as a dicarboxylic acid component and constituent moieties derived from each of ethylene glycol, 1,4-butanediol, and a compound represented by a given structure as an alcohol component, wherein the dicarboxylic acid component comprises from 85 mol % to 100 mol % of terephthalic acid, the alcohol component comprises from 85 mol % to 100 mol % of 1,4-butanediol based on a total amount of ethylene glycol and 1,4-butanediol, and the alcohol component comprises from 0.001 mass % to 5 mass % of the compound represented by the given structure in 100 mass % of the alcohol component.

公开(公告)号：US20230151207A1

公开(公告)日：2023-05-18

申请号：US17917313

申请日：2021-04-08

Applicant: TOYOBO CO., LTD.

Inventor： Keiichiro TOGAWA ,  Hironao SASAKI

IPC: C08L67/02 ,  C08G63/183 ,  C08G63/78 ,  C08G63/84 ,  C08J5/18

CPC classification number: C08L67/025 ,  C08G63/183 ,  C08G63/785 ,  C08G63/84 ,  C08J5/18 ,  C08L2201/10 ,  C08L2207/20 ,  C08L2203/16 ,  C08L2203/12 ,  C08J2367/02

Abstract: The aim of the present invention is to provide a copolymerized polyester resin for solving the problem of die staining and foreign matter adhesion to the film etc. in the continuous production of the film etc.; and the problem of recycling property of the copolymerized polyester. This copolymerized polyester resin contains dicarboxylic acid and did as constituting components, wherein the copolymerized polyester resin contains terephthalic acid as a main component of a dicarboxylic acid component, and contains ethylene glycol as a main component of a diol component, wherein a content of diethylene glycol is from 7 to 30% by mole and a content of triethylene glycol is from 0.05 to 2% by mole when a total amount of the whole diol component is taken as 100% by mole, wherein a content of a cyclic dimer consisting of terephthalic acid and diethylene glycol is 7000 ppm or less, and wherein a content of a cyclic dimer consisting of terephthalic acid, diethylene glycol and triethylene glycol is 200 ppm or less.