Patent ID: 7776934

Claim:
A one-component foamable polyurethane composition comprising a) an isocyanate-terminated quasi-prepolymer having an isocyanate content of from 15 to 27% by weight, the quasi-prepolymer having an average isocyanate functionality of from 2.6 to 3.5; b) a hydrated sodium citrate salt or potassium citrate salt which hydrated salt loses at least two moles of water of hydration per mole of salt when exposed to at least one temperature in the range of from 100 to 180° C.; c) at least one catalyst for the reaction between an isocyanate group and water, wherein the hydrated salt is present in an amount such that at least 0.5 equivalents of water of hydration are provided per equivalent of isocyanate groups in the quasi-prepolymer when the foamable polyurethane composition is heated to at least one temperature in the range of from 80 to 190° C., and d) from 20 to 50% by weight of the composition of a plasticizer, rubber or combination thereof.