Reference

Low-density polyurethane foams

Low-density polyurethane foams. Katsuki, Koretoshi; Hisanaga, Masao (Toyo Rubber Chemical Industry Co., Ltd., Japan). Japan. Kokai JP 52098796 18 Aug 1977 Showa, 2 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C08G018-14. APPLICATION: JP 76-16218 17 Feb 1976. DOCUMENT TYPE: Patent CA Section: 36 (Plastics Manufacture and Processing) Compns. of diphenylmethane 4,4'-diisocyanate (I, H2O, amines, and silicone oil give foams having high expansion ratios. Thus, a compn. of I 100, silicone oil 2, H2O 8.2, triethylenediamine 1.0, dimethylethanolamine 1.5 parts was stirred 30 s to give a foam [25686-28-6] having d. 0.010.

Liquid polyisocyanates containing carbodiimide groups, storage-stable

Liquid polyisocyanates containing carbodiimide groups, storage-stable. (BASF A.-G., Ger.). Belg. BE 851491 16 Aug 1977, 15 pp. (French). (Belgium). CODEN: BEXXAL. CLASS: IC: C08G. PRIORITY: DE 76-2606419 18 Feb 1976. DOCUMENT TYPE: Patent CA Section: 35 (Synthetic High Polymers) The title polyisocyanates are manufd. under moderate reaction conditions in the presence of a small amt. of catalyst and with the absence of side products by condensing diisocyanates in the presence of 3-methyl-1-phenylphospholine 1-oxide (I) [60031-54-1] as catalyst, interrupting the condensation by the addn. of FeCl3, BzCl [98-88-4], Me p-toluenesulfonate [80-48-8], or Me2SO4 [77-78-1], which stabilize the product, and by allowing the condensation to proceed until the NCO content is 25-35%. Thus, 0.9 g I was added to 30 kg melted diphenylmethane 4,4'-diisocyanate at 60° and heated 67 min at 80° to give polymer [25686-28-6] with NCO content 29.1%, with viscosity 31 cP (20°), and contg. carbodiimide groups, which was mixed with 0.9 g BzCl to give a product that had NCO content 27.6% and viscosity 142 cP (20°) after 6 mo storage at ambient temp.