VERFAHREN ZUR HERSTELLUNG VON IM WESENTLICHEN GESCHLOSSENZELLIGEN URETHAN-, HARNSTOFF- UND BIURETGRUPPEN AUFWEISENDEN HARTSCHAUMSTOFFEN MIT HERVORRAGENDER HAFTUNG AN FESTEN OBERFLAECHEN UND DEREN VERWENDUNG

• Main Authors: SCHOLL, HANS JOACHIM., 5000 KOELN, DE, WELTE, RAINER., 5090 LEVERKUSEN, DE
• Format: Patent
• Language: German
• Published: 19.12.1991
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

Essentially closed-cell rigid foams containing urethane, urea and biuret groups and having exceptional adhesion to solid surfaces are prepared by reacting a) prepolymers which contain terminal NCO groups and are the products of the reaction of a parts by weight of an at least difunctional polyol with b parts by weight of an at least difunctional polyisocyanate, where 1) the a:b ratio is at least 1:10 and 2) the OH number of the at least difunctional polyol is <100, with b) compounds containing at least two hydrogen atoms which are reactive towards isocyanates, and generally have a molecular weight of 400 - 10,000, in the presence of c) catalysts and d) water as blowing agent, and optionally in the presence of e) chain extenders and/or crosslinking agents, and f) assistants and/or additives. a