Method of making a polyurethane foam having improved flame retardance and aged k-factors
First Claim
1. A method of making a polyisocyanate based closed cell rigid foam comprising reacting an organic isocyanate and a polyol composition in the presence of a blowing agent comprising an aliphatic or cycloaliphatic C4 -C7 hydrocarbon, wherein said polyol composition comprises:
- a) a polyol having polyester linkages and a number average molecular weight of 400 or more; and
b) about 8 parts per hundred of polyol (php) of a silicone-containing surfactant polymer.
1 Assignment
0 Petitions
Accused Products
Abstract
There is now provided a method for making a polyisocyanate based rigid closed cell foam by reacting an organic isocyanate and a polyol composition containing a polyol having polyester linkages and a number average molecular weight of 400 or more, and at least about 8 php of a silicone-containing surfactant polymer, in the presence of an aliphatic or cycloaliphatic C4 -C7 hydrocarbon blowing agent. Either mixed into the polyol composition at the time of foaming, mixed into an isocyanate, or both, is an aliphatic or cycloaliphatic C4 -C7 hydrocarbon.
45 Citations
23 Claims
-
1. A method of making a polyisocyanate based closed cell rigid foam comprising reacting an organic isocyanate and a polyol composition in the presence of a blowing agent comprising an aliphatic or cycloaliphatic C4 -C7 hydrocarbon, wherein said polyol composition comprises:
-
a) a polyol having polyester linkages and a number average molecular weight of 400 or more; and b) about 8 parts per hundred of polyol (php) of a silicone-containing surfactant polymer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
-
Specification