| 摘要 |
PROBLEM TO BE SOLVED: To provide a sheety material which does not undergo adhesion when laid on another even in a highly humid atmosphere, does not cause a problem with mat pins, and does not suffer from matting agent separation both during dry handling and during wet handling. SOLUTION: Copolymer microparticles are produced by suspension-polymerizing a suspension by heating under agitation with a high-speed disperser. The suspension has viscosity of 0.1-2 cPa×s(25°C) and is prepared by dispersing a mixture containing 0.5 to 20 mass% carboxylated ethylenically unsaturated monomer, 80 to 99.5 mass% hydrophobic ethylenically unsaturated monomer, 0 to 20 mass% monomer copolymerizable therewith, and a polymerization initiator in the presence of polyvinylpyrrolidone in an aqueous medium. COPYRIGHT: (C)2004,JPO
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