POLYOLEFIN-BASED COMPOSITE RESIN SPHERICAL PARTICLES, COATING COMPOSITION AND COATED OBJECT

摘要

Provided are polyolefin-based composite resin spherical particles which can be used for a coating material in order to obtain a coating having a matt finish, soft feel and excellent scratch-resistance. Also provided are a coating composition, which contains the polyolefin-based composite resin spherical particles and a coating resin, and a coated object which is obtained by coating a base material with the coating composition. The polyolefin-based composite resin spherical particles are obtained by: mixing 100 parts by mass of a polyolefin-based resin, 40 to 1500 parts by mass of water, and 3 to 30 parts by mass of ethylene oxide-propylene oxide copolymer having a weight average molecular weight of 4000 to 30 000; emulsifying the resulting mixture at a temperature not lower than the maximum melting point of the polyolefin-based resin; and then cooling the mixture from a temperature which is at least 25ºC higher than the maximum crystallization temperature of the polyolefin-based resin to a temperature which is at least 25ºC lower than the minimum crystallization temperature of the polyolefin-based resin at a cooling rate of no less than 0.2ºC/min. The polyolefin-based resin is a composite resin containing 5% to 70% by mass of a partial saponification product of an ethylene-vinyl acetate copolymer.