Reference

Imidazolylsuccinic acid derivatives as curing agents for epoxy resins

Imidazolylsuccinic acid derivatives as curing agents for epoxy resins. (Shikoku Chemicals Corp., Japan). Jpn. Kokai Tokkyo Koho JP 58180473 A2 21 Oct 1983 Showa, 9 pp. (Japanese). (Japan). CODEN: JKXXAF.In this article, certain chemicals are used. Some of their cas registry numbers are 88660-88-2 and 693-98-1 CLASS: IC: C07D233-60; C08G059-52. APPLICATION: JP 82-64509 16 Apr 1982. DOCUMENT TYPE: Patent CA Section: 37 (Plastics Manufacture and Processing) Section cross-reference(s): 28 The title compds. I (R = H, Me, Et, C11H23, C17H35, Ph; R1 = H, Me) were prepd. and used for curing epoxy resins. Thus, 2-ethylimidazole [1072-62-4] and maleic acid [110-16-7] were refluxed in H2O for 2 h to give 73% (2-ethyl-1-imidazolyl)succinic acid (II) [88660-84-8]. A mixt. of Epikote 828 [25068-38-6] 100, II 8, and Aerosil-300 1 part had viscosity 19,000 cP at 25°, gel time (150°) 385 s, and pot life >120 and >90 days at 5° and 20°, resp. .

Isocyanate compound having blocked isocyanate groups

Isocyanate compound having blocked isocyanate groups. Nishizawa, Hiroshi; Tanaka, Shigeki; Hashiya, Kohei (Hitachi Chemical Co., Ltd., Japan). Japan. Kokai JP 53037663 6 Apr 1978 Showa, 4 pp. Division of Japan. Kokai 75 36,423. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C07D233-26. APPLICATION: JP 73-88386 8 Aug 1973. DOCUMENT TYPE: Patent CA Section: 42 (Coatings, Inks, and Related Products) Section cross-reference(s): 28 A mixt. of 384 g 2,4-tolylene diisocyanate [584-84-9] and 192 g 2-ethylimidazole [1072-62-4] in DMF-Me2CO was stirred 2 h at 60° to form an intermediate, to which was added 1.7 g Bu2Sn dilaurate, followed by addn. in 2 h at 60° of 135 g a,a-bis(hydroxymethyl)propionic acid [4767-03-7] in DMF and stirring the mixt. 4 h at 60° to give blocked isocyanate compd. (I) [66989-16-0], which was water sol. when treated with alkali or bases, produced free NCO groups upon heating at 80-180°, and was useful as a hardener and emulsifier for paints.