Process for the production of rigid polyurethane foams

Details Process for the production of rigid polyurethane foams Process for the production of rigid polyurethane foams

C - Chemistry, Metallurgy

08

G

C08G 18/36 (2006.01) C08G 18/32 (2006.01) C08G 18/48 (2006.01) C08G 18/50 (2006.01) C08G 18/66 (2006.01) C08J 9/14 (2006.01)

Patent

CA 2213925

This invention provides a process for producing rigid polyurethane foams by re- acting A) a polyol component with B) a polyisocyanate component in the presence of C) water, D) at least one catalyst, and, optionally, E) at least one blowing agent. This process specifically requires A) a polyol component which comprises: 1) a polyol containing at least two isocyanate-reactive hydrogen atoms and comprising: a) a mixture of i) an addition product having a OH number of at least 500 of diamines or polyamines containing primary and/or secondary amino groups with alkylene oxides, and ii) castor oil, and/or b) one or more reaction products obtained by reacting i) an addition product having a OH number of at least 500 of diamines or polyamines containing primary and/or secondary amino groups with alkylene oxides, and ii) castor oil; and 2) at least one compound containing at least two isocyanate-reactive hydrogen atoms. Suitable polyisocyanates B) for the present invention are those containing an NCO group content of from 20 to 48% by weight.

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