POLYURETHANE FOAM AND METHOD FOR PRODUCING SAME.

摘要

A polyurethane foam can be obtained by the reaction of a mixture comprising A) a isocyanate-reactive compound; B) a blowing agent selected from the group including linear, branched or cyclic C1 to C6 hydrocarbons, linear, branched or cyclic C1 to C6 fluorinated hydrocarbons, N2, O2, argon and/or CO2, the blowing agent B) being present in a supercritical or near-critical state; and C) a polyisocyanate. The isocyanate-reactive compound A) comprises a hydrophobic portion and has a hydrophilic portion and an average hydroxyl functionality of more than 1. The hydrophobic portion comprises a saturated or unsaturated hydrocarbon chain with at least six C atoms and the hydrophilic portion comprises alkylene oxide units and/or ester units. Most preferred as component A) is a sorbitan ester of formula (II), with w+x+y+z = 20.