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AssigneeMatsumoto Yushi-Seiyaku Co., Ltd.
InventorsNaoya TAYAGAKI, Katsushi MIKI
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Heat-expandable microspheres composed of a thermoplastic resin shell and a thermally-vaporizable blowing agent encapsulated therein, and having an average particle size ranging from 1 to 100 μm. The amount of DMF-insoluble matter (G1) and the amount of DMF-MEK-insoluble matter (G2) constituting the heat-expandable microspheres satisfy 1.05<G2/G1. The expansion of the heat-expandable microspheres satisfy Hmax/Tmax≧13 (μm/° C.) where Hmax and Tmax are as defined herein. Also disclosed in a process for producing the heat-expandable microspheres which includes preparing an aqueous suspension comprising oily globules dispersed in an aqueous dispersion medium containing a hydrophilic cross-linking agent, wherein the oily globules are made of an oily mixture comprising the blowing agent and a monomer component; and polymerizing the monomer component.
Heat-expandable microspheres comprising a thermoplastic resin shell and a thermally-vaporizable blowing agent encapsulated therein, and having an average particle size ranging from 1 to 100 μm;
(canceled)
A process for producing heat-expandable microspheres comprising a thermoplastic resin shell and a thermally-vaporizable blowing agent encapsulated therein, and having an average particle size ranging from 1 to 100 μm, the process comprising:
A process for producing heat-expandable microspheres comprising a thermoplastic resin shell and a thermally-vaporizable blowing agent encapsulated therein, and having an average particle size ranging from 1 to 100 μm, the process comprising:
Dependencies are inferred from the claim text.