METHOD FOR MANUFACTURING THERMALLY EXPANDABLE MICRO PARTICLE HAVING FINE PARTICULATES ADHERING TO ITS SURFACE, THERMALLY EXPANDABLE MICRO PARTICLE AND EXPANDED MICRO PARTICLE OBTAINED BY THE METHOD

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing a thermally expandable micro particle having fine organic resin particulates adhering to its surface, wherein coagulation and fusion in a heating foaming process is significantly suppressed, and to provide the thermally expandable micro particle and an expanded micro particle obtained by the method.;SOLUTION: The method comprises a process for dispersing the organic resin particulates having a diameter smaller than the particle size of a thermally expansive microcapsule obtained by carrying out the suspension polymerization of a polymerizable monomer insoluble in a suspension component of suspension containing a low-boiling organic solvent, the polymerizable monomer and a polymerization catalyst, a process for obtaining a mixed and dispersed solution containing the thermally expansive microcapsule and the organic resin particulates by carrying out the suspension polymerization of the polymerizable monomer of the suspension in which obtained organic resin particulates are dispersed, and a process for drying the mixed and dispersed solution under drying conditions where the thermally expansive microcapsule is not expanded.;COPYRIGHT: (C)2003,JPO