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1. (WO2018124294) POLYESTER, AND PRODUCTION METHOD THEREFOR AND MOLDED ARTICLE MADE THEREFROM

Pub. No.:    WO/2018/124294    International Application No.:    PCT/JP2017/047333
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Fri Dec 29 00:59:59 CET 2017
IPC: C08G 63/82
B65D 1/00
Applicants: KURARAY CO., LTD.
株式会社クラレ
Inventors: TANABE, Soichiro
田邉 宗一郎
SAKANO, Takeshi
坂野 豪
Title: POLYESTER, AND PRODUCTION METHOD THEREFOR AND MOLDED ARTICLE MADE THEREFROM
Abstract:
Provided is a polyester which contains at least 50 mol% of a terephthalic acid unit with respect to the sum total of dicarboxylic acid units, and which contains at least 50 mol% of an ethylene glycol unit with respect to the sum total of diol units, and which is obtained by polycondensation of a dicarboxylic acid and a diol in the presence of: a cobalt compound (M); at least one type of phosphorus compound (P) selected from the group consisting of phosphoric acid, phosphorous acid, organo-phosphonic acid, and esters thereof; and a poly-carboxylic acid (X) having an α,β-dicarboxylic acid unit, wherein the cobalt compound (M) is added in an amount of 0.0005-0.05 parts by mass in terms of cobalt element with respect to 100 parts by mass of the sum total of dicarboxylic acids, the molar ratio (P/M) of the phosphorus atoms in the phosphorus compound (P) with respect to the cobalt atoms in the cobalt compound (M) is 0.01-10, and the molar ratio (X/M) of the poly-carboxylic acid (X) with respect to the cobalt atoms in the cobalt compound (M) is 0.01-10. Such polyester exhibits a good color tone, and molded articles obtained using said polyester are highly transparent and exhibit excellent impact resistance.