Patent ID: 8017229
Filing Date: 2011-09-13
Classification: B29C,B29K,B32B,C08G,Y10T

Abstract:
1. A polyurethane composite comprising a layer of rigid polyurethane as a liner and a layer of flexible integral polyurethane foam foamed directly on the rigid polyurethane liner wherein the flexible integral polyurethane foam is surface pore closed; wherein the rigid polyurethane is a reaction product of a polyisocyanate and a polyol selected from the group consisting of trihydric alcohol, tetrahydric alcohol and penthydric alcohol, the rigid polyurethane has a density of from 600 kg/m the flexible polyurethane foam is a reaction product of diisocyanate and polyol at the presence of water as a blowing agent, the flexible polyurethane foam has a density of from 60 kg/m