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US 5,496,869 AGranted
Methods and compositions for preparing rigid foams with non-chlorofluorocarbon blowing agents
AssigneeStepan Company
InventorsSteve Williams, Warren Kaplan, Paul Neill, Gerardo Chapa
Life of this patent
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Abstract
Disclosed are methods and compositions for preparing rigid foams by contacting a polyisocyanate with a polyol mixture comprising (a) from about 40-95% by weight of a polyester or polyether polyol; (b) a catalytic amount of a catalyst system comprising a primary catalyst and an amino acid salt catalyst derived from sarcosine; and (c) a non-chlorofluorocarbon blowing agent.
Claims10
A rigid foam having urea or urethane groups as the major recurring polymer unit, the polymer comprising the reaction product obtained by contacting a polyisocyanate with a polyol mixture comprising
- (a) from about 40-95% by weight of polyols;
- (b) a catalytic amount of a catalyst system comprising a primary catalyst and an amino acid salt derived from sarcosine;
- and
- (c) a non-chlorofluorocarbon blowing agent.
1 more element
Dependencies are inferred from the claim text.