Reference

Polyesters

Polyesters. (Toray Industries, Inc., Japan). Jpn. Kokai Tokkyo Koho JP 58185618 A2 29 Oct 1983 Showa, 7 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C08G063-22. APPLICATION: JP 82-68793 26 Apr 1982. DOCUMENT TYPE: Patent CA Section: 35 (Chemistry of Synthetic High Polymers) Polyesters are prepd. by transesterification-polycondensation of a glycol component (principally ethylene glycol) and a diacid component (mainly dialkyl terephthalate) in a first stage in which a Ca compd., a Li compd., and a P compd. (0. 12789-45-6 and 512-56-1 are also in the experiment.1-1.0 equiv/equiv Li) are added before or at the beginning of ester exchange, and a Li compd. is added after this stage but before polycondensation. The polyesters have good opacity and sliding properties. Thus, ethylene glycol and di-Me terephthalate were esterified in the presence of Ca(OAc)2 [62-54-4], LiOAc [546-89-4], and Me3PO4 [512-56-1]. LiOAc and Sb2O3 were added to the product and polycondensation was carried out to give poly(ethylene terephthalate) [25038-59-9]. .

Polyester elastomers

Polyester elastomers. Kurisu, Shizuka; Kawase, Shoji (Teijin, Ltd., Japan). Japan.Several substances are used for example 56602-82-5 and 553-54-8 which are their cas registry numbers. Kokai JP 52011294 28 Jan 1977 Showa, 5 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C08G063-66. APPLICATION: JP 75-86643 17 Jul 1975. DOCUMENT TYPE: Patent CA Section: 38 (Elastomers, Including Natural Rubber) Di-Me terephthalate (I), 1,4-butanediol (II), polytetramethylene glycol (III), and pentaerythritol (IV) are polycondensed in presence of Li and Ti compds. to give high-mol. wt. polyester rubber. Thus, a mixt. of I 33.5, II 38.9, III (mol. wt. 2000) 65, IV 0.1, LiOAc [546-89-4] 0.012, and (BuO)4Ti [5593-70-4] 0.018 part was heated at 170-220.degree. to remove 95% MeOH, 10 min at 240.degree., 30 min at 240.degree. and 20 mm, and 3 h at 240.degree. and 0.1-0.3 mm to give copolymer [56602-82-5] having reduced viscosity (35.degree., 1.2 g/dL o-ClC6H4OH) 2.87, compared with 1.70 for a similar polymer prepd. with 0.047 part (BuO)4Ti and no LiOAc. .