Process for the preparation of heat curable flexible molded...

Details Process for the preparation of heat curable flexible molded... Process for the preparation of heat curable flexible molded...

C - Chemistry, Metallurgy

08

J

403/44

C08J 9/02 (2006.01) C08G 18/72 (2006.01) C08G 18/76 (2006.01) C08J 9/12 (2006.01)

Patent

CA 2026033

PROCESS FOR THE PREPARATION OF HEAT CURABLE FLEXIBLE MOLDED POLYURETHANE FOAMS ABSTRACT OF THE DISCLOSURE The present invention relates to a process for the preparation of heat curable flexible molded polyurethane foams comprising reacting in a closed mold (a) polyisocyanates of the diphenylmethane diisocyanate type containing no more than 80% by weight of monomeric diphenylmethane diisocyanate as the 4,4'-isomer, with (b) compounds containing at least two isocyanate-reactive hydrogen atoms and having a molecular weight of from 400 to about 10,000, and, optionally, (c) chain lengthening and/or crosslinking agents containing at least two isocyanate-reactive hydrogen atoms and having a molecular weight of from 32 to 399, in the presence of (d) water as blowing agent.

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