초록 ▼

Polyurethane foams prepared using polysiloxane/polyoxyalkylene surfactants, preferably blended with a viscosity modifying agent, particularly in combination with particulate silica, especially silica aerogel, exhibit improved thermal insulating capacity, as measured by K-factor, and improved closed

Polyurethane foams prepared using polysiloxane/polyoxyalkylene surfactants, preferably blended with a viscosity modifying agent, particularly in combination with particulate silica, especially silica aerogel, exhibit improved thermal insulating capacity, as measured by K-factor, and improved closed cell content, without increasing the density of the polyurethane foam.

대표청구항 ▼

[ What is claimed is:] [1.] A composition comprising a siloxane surfactant and a liquid low viscosity organic compound wherein said siloxane surfactant is represented by the general formula, [ STR 4 ] wherein R is methyl, x is a number of from 10 to 50, y is a number of from 2 to 20 and R' is an alk

[ What is claimed is:] [1.] A composition comprising a siloxane surfactant and a liquid low viscosity organic compound wherein said siloxane surfactant is represented by the general formula, [ STR 4 ] wherein R is methyl, x is a number of from 10 to 50, y is a number of from 2 to 20 and R' is an alkyl alkoxylate of the general formula, --R"O(C.sub.2 H.sub.4 O).sub.m (C.sub.3 H.sub.6 O).sub.n H, wherein R" is an alkylene group containing from 3 to 6 carbon atoms, m is a number of from 5 to 200 and n is a number of from 2 to 18, wherein further, said liquid low viscosity organic compound is propylene carbonate, 2-methoxy ethyl ether, or dipropylene glycol methyl ether.