NOVEL IMPACT MODIFIERS FOR EPOXY-BASED ADHESIVES

摘要

An impact modifier with epoxy group termination is described, comprising the reaction product of a) two or more polyols, b) one or more polyisocyanates and c) at least one epoxy resin comprising an epoxy compound containing a primary or secondary hydroxyl group, wherein the polyols comprise a1) at least one polyether polyol and a2) at least one OH-terminated rubber, where the weight ratio of polyether polyol to OH-terminated rubber is in the range from 7:3 to 2:8, as are an isocyanate-terminated prepolymer as a possible intermediate and processes for preparation thereof. The products obtained are suitable for improving the impact resistance of epoxy resin compositions, especially of 1K or 2K epoxy resin adhesives.