Patent ID: 8017229

Claim:
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 3 to 1200 kg/m 3 and a Shore D hardness of from 40 to 80; 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 3 to 200 kg/m 3 , a tensile strength of from 60 kPa to 250 kPa, an elongation at break of from 70% to 180%, a tearing strength of from 130 N/m to 220 N/m.