The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 24, 2018
Filed:
Oct. 02, 2014
Matsumoto Yushi-seiyaku Co., Ltd., Yao-shi, Osaka, JP;
Naoya Tayagaki, Yao, JP;
Katsushi Miki, Yao, JP;
MATSUMOTO YUSHI-SEIYAKU CO., LTD., Yao-shi, Osaka, JP;
Abstract
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 (G) and the amount of DMF-MEK-insoluble matter (G) constituting the heat-expandable microspheres satisfy 1.05<G/G. The expansion of the heat-expandable microspheres satisfy H/T≥13 (μm/° C.) where Hand Tare 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.