HYDROPHOBIC POLYOLS FOR SEALANT APPLICATIONS

摘要

There is disclosed a moisture curable sealant system, comprising a prepolymer that is a reaction product of an isocyanate component that includes at least one polyisocyanate and an isocyanate-reactive component that includes at least a polyoxybutylene polyoxypropylene polyol, the polyol having a functionality from 1.6 to 3.5 and a number average molecular weight from 1500 to 8000 wherein the polyoxybutylene polyoxypropylene polyol contains 50 to 85 percent by weight of polyoxybutylene.