Patents by Inventor Masayoshi Okubo
Masayoshi Okubo has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9187580Abstract: The present invention provides a resin particle having many recesses on the surface thereof, which has solvent resistance and heat resistance. More specifically, the present invention provides a resin particle having many recesses on the surface thereof which is obtained by using a seed particle, wherein a seed particle component in the resin particle has a crosslinked structure.Type: GrantFiled: May 11, 2009Date of Patent: November 17, 2015Assignee: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Shigeki Hamamoto, Hirotsugu Kawata, Kiyoshi Yamaguchi, Masayoshi Okubo
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Publication number: 20110090568Abstract: The present invantion provides a resin particle having many recesses on the surface thereof, which has solvent resistance and heat resistance. More specifically, the present invantion provides a resin particle having many recesses on the surface thereof which is obtained by using a seed particle, wherein a seed particle component in the resin particle has a crosslinked structure.Type: ApplicationFiled: May 11, 2009Publication date: April 21, 2011Applicant: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Shigeki Hamamoto, Hirotsugu Kawata, Kiyoshi Yamaguchi, Masayoshi Okubo
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Publication number: 20080138366Abstract: The present invention provides a cosmetic comprising a spherical resin particle having many recesses on the surface thereof. According to the present invention, a cosmetic which is excellent in spreadability and a touch feeling at application, and an effect such as a moist feeling, a wet feeling, a dry feeling and the like after application, and retention thereof, as well as a cosmetic which has an optical function such as color rendering property and a foggy feeling (wrinkle degradation effect) are provided.Type: ApplicationFiled: January 13, 2006Publication date: June 12, 2008Applicant: SUMITOMO SEIKA CHEMICALS CO., LTD.Inventors: Masayoshi Okubo, Kiyoshi Yamaguchi, Shigeki Hamamoto
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Publication number: 20020132931Abstract: A resin composition for an aqueous paint containing different phase structure emulsion particles obtained by multi-stage emulsion polymerization as a binder, wherein the different phase structure emulsion particles have an outermost phase formed by an emulsion polymer of an ethylenic unsaturated monomer, having a glass transition temperature of from −500° C. to 10° C.Type: ApplicationFiled: March 18, 2002Publication date: September 19, 2002Applicant: DAI NIPPON INSATSU KABUSHIKI KAISHA, SHINJUKU-KU JAPANInventors: Masayoshi Okubo, Shinya Sakaguchi, Atsushi Takamatsu, Hiroharu Sasaki, Kazuyoshi Tsuneta
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Patent number: 6410655Abstract: A resin composition for an aqueous paint containing different phase structure emulsion particles obtained by multi-stage emulsion polymerization as a binder, wherein the different phase structure emulsion particles have an outermost phase formed by an emulsion polymer of an ethylenic unsaturated monomer, having a glass transition temperature of from −50° C. to 10° C., and satisfy the following conditions (1) to (3): (1) the emulsion polymer forming the outermost phase contains from 1 to 20 mass % of an ethylenic unsaturated monomer having at least one of a polyethylene glycol chain and a polypropylene glycol chain, (2) at least one phase of inner phases from the outermost phase of the different phase structure emulsion particles comprises an emulsion polymer of an ethylenic unsaturated monomer having a glass transition temperature of from 30° C. to 110° C., and (3) the binder has a minimum film-forming temperature of at most 10° C.Type: GrantFiled: December 8, 2000Date of Patent: June 25, 2002Assignee: Dai Nippon Toryo Co., Ltd.Inventors: Masayoshi Okubo, Shinya Sakaguchi, Atsushi Takamatsu, Hiroharu Sasaki, Kazuyoshi Tsuneta
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Publication number: 20010003770Abstract: A resin composition for an aqueous paint containing different phase structure emulsion particles obtained by multi-stage emulsion polymerization as a binder, wherein the different phase structure emulsion particles have an outermost phase formed by an emulsion polymer of an ethylenic unsaturated monomer, having a glass transition temperature of from −50° C. to 10° C.Type: ApplicationFiled: December 8, 2000Publication date: June 14, 2001Applicant: Dai Nippon Toryo Co., Ltd.Inventors: Masayoshi Okubo, Shinya Sakaguchi, Atsushi Takamatsu, Hiroharu Sasaki, Kazuyoshi Tsuneta
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Patent number: 5179158Abstract: A process for producing an aqueous resin dispersion is disclosed, which comprises dissolving a macromonomer having a radical polymerizable group at the terminal thereof and an oil-soluble radical polymerization initiator in a hydrophobic vinyl monomer copolymerizable with the macromonomer to form a solution, emulsifying the solution in an aqueous medium in the presence of an emulsifying agent selected from (A) an alkali sulfosuccinate anionic surfactant and (B) a surfactant comprising from 2 to 98% by weight of (i) an alkali sulfonate anionic surfactant other than (A) or (ii) an alkali sulfuric ester anionic surfactant, and from 98 to 2% by weight of a nonionic surfactant having an HLB value of 10 or more, and copolymerizing the macromonomer and the vinyl monomer at an elevated temperature. The aqueous resin dispersion has a high content of a graft polymer with a reduced content of unreacted macromonomer.Type: GrantFiled: August 9, 1990Date of Patent: January 12, 1993Assignee: Toagosei Chemical Industry Co., Ltd.Inventors: Kishiro Azuma, Yoshio Mori, Masayoshi Okubo
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Patent number: 4996265Abstract: In a dispersion system comprising seed polymer particles and a monomer, the solubility of the monomer is reduced by such means as addition of water, whereby the monomer is precipitated and absorbed in the seed polymer particles, and in this state, the monomer absorbed in the seed polymer particles is selectively polymerized.Namely, according to the present invention, the decrease of the solubility of the monomer in the dispersion system is utilized for absorption of the monomer in the seed polymer particles, and polymer particles having an increased particle size can be prepared in a short time at a high efficiency.Type: GrantFiled: January 25, 1989Date of Patent: February 26, 1991Assignee: Mita Industrial Co., Ltd.Inventors: Masayoshi Okubo, Masami Tsujihiro
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Patent number: 4910229Abstract: A process for producing hollow polymer latex particles, which comprises(1) adding a base to a carboxyl-containing polymer latex obtained by emulsion polymerization of a monomeric mixture composed of at least 0.1% by weight of an ethylenically unsaturated carboxylic acid and another ethylenically unsaturated monomer copolymerization with the carboxylic acid to adjust the pH of the polymer latex to at least 7 and swell the polymer latex particles, and(2) adding an acid to the polymer latex formed in (1) to adjust the pH of the latex to not more than 7.Type: GrantFiled: March 28, 1989Date of Patent: March 20, 1990Assignee: Nippon Zeon Co., Ltd.Inventor: Masayoshi Okubo
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Patent number: 4777104Abstract: Disclosed is a process in which a spherical electrophotographic toner containing a colorant and having a particle size suitable for the electrophotography is directly formed in the polymerization process for formation of a binder resin. If a reaction medium capable of dissolving a monomer but incapable of dissolving a formed polymer is used and polymerization is carried out in the presence of a radical polymerization initiator in the state where the monomer, the colorant and other additives are dissolved or dispersed in the reaction medium, an electrophotographic toner having a desired particle size is obtained. According to this process, the particle size of the colored resin is stably controlled to 1 to 30 .mu.m suitable for a toner in the polymerization process, and the particle size distribution is very sharp.Type: GrantFiled: May 29, 1986Date of Patent: October 11, 1988Assignee: Mita Industrial Co., Ltd.Inventors: Tsunetaka Matsumoto, Masayoshi Okubo, Toshiro Tokuno