Matsumoto Yushi-seiyaku Co., Ltd.

Yu Kita

Katsushi Miki

Sachiko Tokumura

Heat-expandable microspheres and applications thereof, the heat-expandable microspheres including a thermoplastic resin shell and a thermally-vaporizable blowing agent encapsulated therein. The thermoplastic resin is produced by polymerizing a polymerizable component containing (A) a nitrile monomer including methacrylonitrile, (B) a carboxyl-group-containing monomer and (C) a monomer having a functional group reactive with the carboxyl group. The polymerizable component satisfies the following conditions 1 and 2: Condition 1: The weight fraction of the monomers (A), (B) and (C) in the polymerizable component satisfy the inequality shown below.Weight fraction of the monomer ()&#x3c;Weight fraction of the monomer ()&#x2264;Weight fraction of the monomer ()&#x2003;&#x2003;Inequality (I) Condition 2: The ratio by weight of the monomer (B) to the monomer (C) ranges from 600:1 to 3:1.

Heat-expandable microspheres and application thereof

Heat-expandable microspheres having high heat resistance and high solvent resistance, a production process thereof include a shell of a thermoplastic resin and a thermally vaporizable blowing agent being encapsulated therein. The thermoplastic resin includes a copolymer produced by polymerizing a polymerizable component containing a carboxyl-group-containing monomer. The surface of the heat-expandable microspheres is treated with an organic compound containing a metal of the Groups from 3 to 12 in the Periodic Table.

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Yao, Japan

Yu Kita