Foam sealing gasket

摘要

A sealing gasket includes a liner and a polyurethane foam layer disposed on the liner. The polyurethane foam layer can have a density of 50 kg/m3 to 250 kg/m3, a force-to-compress at 25% compression of not greater than 5.0 psi, and an 50% springback parameter of not greater than 2.0 seconds. The polyurethane foam has a thickness in a range of 0.3 mm to 10.0 mm. A surface of the polyurethane foam layer has a skin.

主权项

1. A sealing gasket comprising a polyurethane foam having a density of not greater than 220 kg/m3 and having an 80% springback parameter in a range of 0.000 seconds to 1 seconds, wherein the polyurethane foam is a reaction product of reaction constituents comprising:
a polyol; an isocyanate; and a delaying catalyst, wherein the delaying catalyst comprises an amine and a dicarboxylic acid and the delaying catalyst has a delay time of at least 3 minutes as measured at 115° C. at a concentration of 0.4 pphp in the presence of 0.3-0.4 pphp water.