C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
403/34
C08G 18/30 (2006.01) C08G 18/66 (2006.01)
Patent
CA 1200648
ABSTRACT OF THE DISCLOSURE This invention is directed to a process for preparing a rigid polyurethane foam by reacting a polyol or a mixture of polyols suitable for use in preparing rigid polyurethane foams with a polyisocy- anate or polyisothiocyanate in the presence of at least one foaming agent and at least one catalyst. The process is characterized by incorporating into the reaction mixture at least one compound having at least one aliphatic primary amine group, the aliphatic pri- mary amine-containing compound being present in an amount such that the theoretical percent urea calcu- lated by the method described herein is from 1 to 30 weight percent based on the total weight of the reac- tive ingredients. This invention is also directed to the rigid polyurethane foam produced by the process, and to a mixture of a polyol suitable for producing a rigid polyurethane foam and an aliphatic primary amine-containing compound. The foams produced by the process show an improvement in at least one property such as thermal conductivity, dimensional stability or expansion at demold.
398172
Booth Llewellyn D.
Lancaster Gerald M.
Turner Robert B.
Smart & Biggar
The Dow Chemical Company
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