WATER DISPERSIBLE REDISPERSIBLE POLYURETHANE/ACRYL COPOLYMER HYBRID RESIN COMPOSITION AND PROCESS FOR PREPARING SAME

摘要

The present invention relates to a water dispersible redispersible polyurethane/acryl copolymer hybrid resin composition and a process for preparing same. The process of preparing redispersible polyurethane/acryl copolymer hybrid resin powder according to the present invention includes forming an ionic group-containing urethane prepolymer; preparing a modified acryl copolymer and mixing the modified acryl copolymer and the polyurethane prepolymer, or preparing a modified acryl copolymer immediately after the preparation of the polyurethane prepolymer in the same reactor in which the polyurethane prepolymer is prepared and enabling the modified acryl copolymer and the polyurethane prepolymer to react with each other; dispersing the mixture or the reaction products in water and extending a chain thereof to acquire a stable water dispersible system; and salting out and dehydrating and drying the resultant structure if necessary. The obtained composition for the preparation of polyurethane/epoxy hybrid powder can be made into powder through salting out and dehydration and drying processes, and is redispersible into water. Alternatively, the solid content of the powder can be increased to shorten drying time when the powder is redispersed in water.