THERMOPLASTIC NON-ADHESIVE POLYURETHANE PARTICLE AND PREPARATION METHOD THEREOF TO PREVENT OR REDUCE ADHESION OF THERMOPLASTIC POLYURETHANE PARTICLE ON SURFACE WITHOUT DETERIORATION OF LIGHT STABILITY AND TRANSPARENCY BY APPLING LIQUID WETTING AGENT AND SOLID POWDER TO THERMOPLASTIC POLYURETHANE IN TURN

摘要

PURPOSE: A method for preparing a thermoplastic polyurethane particle and a thermoplastic non-adhesive polyurethane particle prepared by the method are provided, to reduce the adhesion on the surface of particle without the deterioration of light stability and transparency. CONSTITUTION: The method comprises the steps of applying at least one wetting agent which is liquid at a temperature of 30 deg.C or less to a thermoplastic polyurethane in a concentration of about 0.01-0.5 wt% based on the total amount of components A, B and C, and continuously applying at least one solid powder having a melting point of 70 deg.C or more to the thermoplastic polyurethane in a concentration of 0.01-0.5 wt% based on the total amount of components A, B and C; and pulverizing the thermoplastic polyurethane before or after the application step, wherein the thermoplastic polyurethane is a product obtained by reacting (A) a cycloaliphatic diisocyanate, (B) at least one polyol having a number average molecular weight of 600-8,000 g/mol, and (C) at least one chain extender having a number average molecular weight of 60-500 g/mol, and optionally adding a catalyst and common auxiliary and/or additive.