Reference

Polycarbonates for improved demolding

Polycarbonates for improved demolding. Freitag, Dieter; Nouvertne, Werner; Kleiner, Frank (Bayer A.-G., Ger.). Ger. Offen. DE 2620256 17 Nov 1977, 19 pp. (German). (Germany). CODEN: GWXXBX. CLASS: IC: C08G063-62. APPLICATION: DE 76-2620256 7 May 1976. DOCUMENT TYPE: Patent CA Section: 36 (Plastics Manufacture and Processing) Bisphenol A polycarbonates prepd. in the presence of stearic acid [57-11-4] or stearoyl chloride (I) [112-76-5] as a chain breaker had good demolding properties. Thus, a bisphenol A polycarbonate(relative viscosity 1.33) prepd. in the presence of 2 mol% I and 1 mol% p-tert-butylphenol was demolded at 20 bars at 130°, compared with ~50 bars for polycarbonate prepd. without the I.

Discoloration-resistant urethane rubber compounds

Discoloration-resistant urethane rubber compounds. Hinoue, Kenichi; Ichikawa, Kiyoshi; Kondo, Kunio; Inaba, Yasunobu; Miyake, Akihiro; Notsu, Yoshimasa (Asahi Chemical Industry Co., Ltd., Japan). Japan. Kokai JP 52015548 5 Feb 1977 Showa, 5 pp. (Japanese). (Japan). CODEN: JKXXAF.Several substances like 16890-86-1 may be metioned in this study. CLASS: IC: C08L075-04. APPLICATION: JP 75-91055 28 Jul 1975. DOCUMENT TYPE: Patent CA Section: 38 (Elastomers, Including Natural Rubber) Reaction products of acid hydrazides, dicarboxylic acid esters, acyl chlorides(optional), and dihydrazides are useful as discoloration preventers for urethane rubber. Thus, 100 parts of a copolymer (I) derived from polytetramethylene glycol (mol. wt. 1200) 100, diphenylmethane 4,4'-diisocyanate 31.2, ethylenediamine 2.4, and Et2NH 0.3 part and 3 parts of a reaction product from di-Me adipate [627-93-0] 0.1, nicotinic acid hydrazide [553-53-7] 0.01, 1,2-bis(hydrazinocarbonyl)hydrazine [1617-13-6] 0.1, and stearoyl chloride [112-76-5] 0.01 mol were dissolved in DMF to 25% solids, cast on a glass plate, and dried at 80° and 2 mm to give a film having tensile strength retention and discoloration-resistance rating after 40 h of irradn. in a fadeometer 90.3% and 5 (best rating), resp., and discoloration-resistance rating after N oxide test (AATCC 23-1962) 4, compared with 40.3, 1, and 1, resp., for I alone. .