IMPROVED LOW TEMPERATURE IMPACT STRENGTH IN PTMEG BASED POLYURETHANE IMPACT STRENGTH MODIFIERS

摘要

The present invention relates to a kind of impact modifiers, it is a kind of isocyanate-terminated polymer, its isocyanate groups partly or entirely blocked by with blocking agent, wherein isocyanate-terminated polymeric reaction products) the polytetramethylene ether glycol sub-fractions of one or more polyalcohols includes at least 95 weight %, total weight relative to polyalcohol, and b) two or more polyisocyanate comprising it is 2. that at least one diisocyanate and at least one polyisocyanates, which have average isocyanate functionality,5 or more, it is 2. that wherein the isocyanate groups of the one or more of the molar ratio of the diisocyanate of isocyanate group and one or more polyisocyanates, which have average isocyanate functionality,5 or more lies are 2 to 1 to 20 to 1. Impact modifier be it is suitable, especially in single component epoxy preparation, especially single component epoxy glue, and in bi-component epoxide-resin preparation. Good low-temperature impact-resistant performance can pass through impact modifier.