Matsumoto Yushi-Seiyaku Co., Ltd.

Kazunari Ueda

Katsushi Miki

Daisuke Nakatomi

A process for producing heat-expandable microspheres including a thermoplastic resin shell and a blowing agent encapsulated therein. The process includes the steps of dispersing a polymerizable component and the blowing agent in an aqueous dispersion medium having a pH of 7 or less and containing a fine-particle metal compound having a mean particle size ranging from 1.0 to 10 nm, and polymerizing the polymerizable component. The amount of the fine-particle metal compound ranges from 0.15 to 20 parts by weight to 100 parts by weight of the total amount of the polymerizable component and the blowing agent. Also disclosed are heat-expandable microspheres produced by dispersing a polymerizable component and a blowing agent in an aqueous dispersion medium containing colloidal silica and polymerizing the polymerizable component. Also disclosed is a composition containing the heat-expandable microspheres and a base component, a formed product, a slurry composition for use in forming a negative electrode of a lithium-ion secondary battery and a negative electrode.

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Yao, Japan

Kazunari Ueda