(Meth) acrylic crosslinked fine particles and method of manufacturing the same

摘要

The invention offers (meth)acrylic crosslinked fine particles, with excellent thermal resistance, which are suitably used as, for example, an anti-blocking agent or another additive in food packaging material and a method of manufacturing such particles. The invention involves (1) suspension polymerization of a monomer composition containing methyl methacrylate or another (meth)acrylic monomer using a lauroyl peroxide or another organic peroxide (polymerization initiator) and (2) aging of a polymerized product obtained in the polymerization at a temperature of from 80 DEG C to 95 DEG C for at least 1.5 hours. Hence, (meth)acrylic crosslinked fine particles with a crosslinking structure can be obtained which contain a residue of the (meth)acrylic monomer at a concentration not more than 2000 ppm and start thermally decomposing at a temperature not less than 260 DEG C and which more preferably have an average diameter of from 0.1 mu m to 500 mu m.