PROCESS FOR THE PRODUCTION OF RIGID FOAMS CONTAINING URETHANE, UREA AND BIURET GROUPS AND THE USE THEREOF

摘要

The present invention relates to substantially closed-cell rigid foams containing urethane, urea and biuret groups and exhibiting excellent adhesion to solid surfaces, and to a process for the production of these foams. This process comprises reacting a) a organic polyisocyanate, with b) modified castor oil, in the presence of c) catalysts and d) water. Suitable components for the modified castor oil used herein are the reaction products of castor oil with one or more amine and/or hydroxy compounds. These modified castor oil compositions have an OH number of 200 to 500, preferably 350 to 480. The invention relates also to insulating materials and/ormechanical structural components made from these foams.