Patents by Inventor Yosuke Kumaki

Yosuke Kumaki 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).

  • Patent number: 9562115
    Abstract: The present invention provides an easy-to-handle dispersion stabilizer for suspension polymerization that meets the following requirements: even if the amount of the dispersion stabilizer for suspension polymerization used for suspension polymerization of a vinyl compound is small, the resulting vinyl resin has high plasticizer absorptivity and is easy to work with; it is easy to remove residual monomer components from the resulting vinyl resin; and the resulting vinyl resin contains fewer coarse particles. The present invention relates to a dispersion stabilizer for suspension polymerization in the form of an aqueous liquid. This dispersion stabilizer contains, at a concentration of 20 mass % or more and 50 mass % or less, a PVA having a degree of saponification of 35 mol % or more and 65 mol % or less, a viscosity average degree of polymerization of 100 or more and 480 or less, a terminal aliphatic hydrocarbon group having 6 to 12 carbon atoms, and a block character of residual ester groups of 0.5 or more.
    Type: Grant
    Filed: August 6, 2014
    Date of Patent: February 7, 2017
    Assignee: KURARAY CO., LTD.
    Inventors: Tadahito Fukuhara, Yosuke Kumaki
  • Publication number: 20170029540
    Abstract: A dispersion stabilizer in the present invention contains an aqueous emulsion (a) obtained by dispersing a polymer (A) having an ethylenically unsaturated monomer unit in an aqueous medium, a PVA (B) having a degree of saponification of 65 mol % or more and less than 82 mol % and a viscosity-average degree of polymerization of 250 or more and less than 1500, and a PVA (C) having a degree of saponification of 82 mol % or more and less than 98 mol % and a viscosity-average degree of polymerization of 1500 or more and less than 4000. The dispersion stabilizer contains: 7 to 51 mass % of the polymer (A); 40 to 84 mass % of the PVA (B); and 9 to 53 mass % of the PVA (C), with respect to a total amount of the polymer (A), the PVA (B), and the PVA (C). A vinyl resin satisfying required performance can be obtained using the dispersion stabilizer.
    Type: Application
    Filed: April 8, 2015
    Publication date: February 2, 2017
    Applicants: KURARAY CO., LTD., KURARAY EUROPE GMBH
    Inventors: Tadahito FUKUHARA, Yosuke KUMAKI, Samuel MICHEL, Dirk HARTMANN
  • Publication number: 20170029534
    Abstract: Provided is a dispersion stabilizer for suspension polymerization comprising an aqueous emulsion containing a dispersant (A), a dispersoid (B), a graft polymer (C), and an aqueous medium, wherein the dispersant (A) contains a surfactant, the dispersoid (B) contains a polymer having an ethylenically unsaturated monomer unit, the graft polymer (C) is obtained by graft polymerization of the ethylenically unsaturated monomer with the dispersant (A), a mass ratio [A/(A+B+C)] is 0.001 or more and less than 0.18, a mass ratio [C/(A+B+C)] is 0 or more and less than 0.04, and the total content of the dispersant (A), the dispersoid (B), and the graft polymer (C) is 35 to 70 mass %. A vinyl polymer to be obtained by suspension polymerization of a vinyl compound using the dispersion stabilizer has good plasticizer absorption. Further, the number of fish-eyes that occur when the vinyl polymer is formed is small, and the hue deterioration is also suppressed.
    Type: Application
    Filed: April 8, 2015
    Publication date: February 2, 2017
    Applicants: KURARAY CO., LTD., KURARAY EUROPE GMBH
    Inventors: Tadahito FUKUHARA, Yosuke KUMAKI, Samuel MICHEL, Dirk HARTMANN
  • Publication number: 20160347883
    Abstract: There is provided a dispersing agent for suspension polymerization of a vinyl compound comprising a polyvinyl alcohol with a saponification degree of 65 to 90 mol % which satisfies Formulas (1) to (3). It allows for reducing the amount of coarse particles during polymerization and can thus provide a vinyl polymer with a sharp particle size distribution and higher plasticizer absorbability. 0.4?(MwUV/MwRI)?0.95??(1) 3?(MwUV/MnUV)?12??(2) 0.1?A220?0.
    Type: Application
    Filed: February 4, 2015
    Publication date: December 1, 2016
    Applicant: KURARAY CO., LTD.
    Inventors: Yosuke KUMAKI, Takeshi KUSUDOU, Shunsuke FUJIOKA
  • Patent number: 9505921
    Abstract: There is provided a dispersion stabilizer for suspension polymerization comprising a vinyl alcohol polymer (A), wherein the vinyl alcohol polymer (A) has a terminal anionic group and has a saponification degree of 30 to 60 mol %, a viscosity average polymerization degree of 650 or less, and a proportion of polymer molecules having a molecular weight of 8000 or less as determined by gel permeation chromatography is 9.5% by mass or less. When a vinyl compound is suspension-polymerized using the dispersion stabilizer for suspension polymerization, its higher polymerization stability allows for providing particles having a uniform size with a less amount of coarse particles, even under the conditions favorable for unstable polymerization.
    Type: Grant
    Filed: December 26, 2013
    Date of Patent: November 29, 2016
    Assignee: KURARAY CO., LTD.
    Inventors: Tadahito Fukuhara, Yosuke Kumaki
  • Publication number: 20160229936
    Abstract: Provided by the present invention is a vinyl alcohol polymer crosslinked by a structure represented by the following formula (1) and/or a disulfide structure, in which the vinyl alcohol polymer is not completely dissolved in a mixture prepared by: adding the vinyl alcohol polymer to water so as to give a concentration of 4% by mass; and stirring at 95° C. for 3 hrs. in the formula (1), R1, R2 and R3 each independently represent a hydrogen atom or a substituted or unsubstituted hydrocarbon group having 8 or less carbon atoms. Also provided include an additive for a drilling mud containing the vinyl alcohol polymer, a drilling mud containing the vinyl alcohol polymer as an additive, an additive for a drilling cement slurry containing the vinyl alcohol polymer, and a drilling cement slurry containing the vinyl alcohol polymer as an additive.
    Type: Application
    Filed: September 11, 2014
    Publication date: August 11, 2016
    Applicant: KURARAY CO., LTD.
    Inventors: Yosuke KUMAKI, Yasutomo SAITO
  • Publication number: 20160194416
    Abstract: The present invention provides a highly water-soluble and easy-to-handle dispersion stabilizer for suspension polymerization that meets the following requirements: even if the amount of the dispersion stabilizer for suspension polymerization used for suspension polymerization of a vinyl compound is small, the resulting vinyl resin has high plasticizer absorptivity and is easy to work with; it is easy to remove residual monomer components from the resulting vinyl resin; and the resulting vinyl resin contains fewer coarse particles. The present invention relates to a dispersion stabilizer for suspension polymerization of a vinyl compound. This dispersion stabilizer contains a vinyl alcohol polymer (A) having a degree of saponification of 20 mol % or more and less than 65 mol %, a viscosity average degree of polymerization (P) of 100 or more and less than 600, an aliphatic hydrocarbon group having 6 to 18 carbon atoms at its terminal, and an anionic group in its side chain.
    Type: Application
    Filed: August 6, 2014
    Publication date: July 7, 2016
    Applicant: KURARAY CO., LTD.
    Inventors: Tadahito FUKUHARA, Yosuke KUMAKI
  • Publication number: 20160194412
    Abstract: The present invention provides an easy-to-handle dispersion stabilizer for suspension polymerization that meets the following requirements: even if the amount of the dispersion stabilizer for suspension polymerization used for suspension polymerization of a vinyl compound is small, the resulting vinyl resin has high plasticizer absorptivity and is easy to work with; it is easy to remove residual monomer components from the resulting vinyl resin; and the resulting vinyl resin contains fewer coarse particles. The present invention relates to a dispersion stabilizer for suspension polymerization in the form of an aqueous liquid. This dispersion stabilizer contains, at a concentration of 20 mass % or more and 50 mass % or less, a PVA having a degree of saponification of 35 mol % or more and 65 mol % or less, a viscosity average degree of polymerization of 100 or more and 480 or less, a terminal aliphatic hydrocarbon group having 6 to 12 carbon atoms, and a block character of residual ester groups of 0.5 or more.
    Type: Application
    Filed: August 6, 2014
    Publication date: July 7, 2016
    Applicant: KURARAY CO., LTD.
    Inventors: Tadahito FUKUHARA, Yosuke KUMAKI
  • Publication number: 20160130763
    Abstract: The present invention addresses the problem of providing a composite paper which exhibits excellent oil resistance, water vapor permeability, and water resistance even when hot and oily food is wrapped therein. The above problem can be solved by using a composite paper comprising an oil-resistant layer formed on at least one surface of a base paper, wherein the oil-resistant layer comprises a vinyl alcohol polymer (A) having a content of ethylene units of 2 to 10 mol %, a viscosity-average degree of polymerization of 300 to 2000, a saponification degree of 95 to 99.5 mol %, a total content of carboxyl groups and lactone rings of 0.02 to 3 mol %, a melting point of 180 to 230° C., a content of 1,2-glycol bonds of 1.2 to 2 mol %, and a molar fraction of central hydroxyl groups in chains of three consecutive hydroxyls by a triad expression relative to vinyl alcohol units of 65 to 98 mol %, the base paper has an air permeability resistance of 1000 seconds or less and a bulk density of 0.5 to 1.
    Type: Application
    Filed: May 30, 2014
    Publication date: May 12, 2016
    Applicant: KURARAY CO., LTD.
    Inventors: Masako KAWAGOE, Yosuke KUMAKI
  • Publication number: 20160083490
    Abstract: Provided is a vinyl alcohol-based copolymer, obtained by saponifying a copolymer of vinyl acetate and a polyfunctional monomer, wherein the polyfunctional monomer contains two or more ethylenic double bonds in its molecule, the vinyl alcohol-based copolymer has a side chain containing an ethylenic double bond and a molar ratio (d) of the ethylenic double bond to a total of vinyl alcohol units and vinyl acetate units is from 0.05/100 to 2/100, and the vinyl alcohol-based copolymer is water soluble.
    Type: Application
    Filed: April 17, 2014
    Publication date: March 24, 2016
    Applicant: KURARAY CO., LTD.
    Inventors: Yosuke KUMAKI, Tatsuya TANIDA
  • Publication number: 20150329713
    Abstract: There is provided a dispersion stabilizer for suspension polymerization comprising a vinyl alcohol polymer (A), wherein the vinyl alcohol polymer (A) has a terminal anionic group and has a saponification degree of 30 to 60 mol %, a viscosity average polymerization degree of 650 or less, and a proportion of polymer molecules having a molecular weight of 8000 or less as determined by gel permeation chromatography is 9.5% by mass or less. When a vinyl compound is suspension-polymerized using the dispersion stabilizer for suspension polymerization, its higher polymerization stability allows for providing particles having a uniform size with a less amount of coarse particles, even under the conditions favorable for unstable polymerization.
    Type: Application
    Filed: December 26, 2013
    Publication date: November 19, 2015
    Applicant: KURARAY CO., LTD.
    Inventors: Tadahito FUKUHARA, Yosuke KUMAKI
  • Publication number: 20150274955
    Abstract: There is provided a dispersion stabilizer for suspension polymerization of a vinyl compound, which is composed of an aqueous emulsion, wherein the aqueous emulsion comprises a solid comprising (A) a polyvinyl alcohol, (B) a polyvinyl ester, and (C) a graft polymer produced by graft-polymerizing a vinyl ester monomer to a polyvinyl alcohol; wherein the amount of (A) the polyvinyl alcohol is 0.1 to 18% by mass based on the total amount of (A), (B) and (C); wherein the amount of (C) the graft polymer is 7 to 80% by mass based on the total amount of (A), (B) and (C); and wherein a weight-average molecular weight of the solid as determined by gel permeation chromatography is 1,100,000 or less. Such a dispersion stabilizer for suspension polymerization exhibits excellent polymerization stability and excellent handleability. In addition, a vinyl resin obtained using the dispersion stabilizer for suspension polymerization has good plasticizer absorbency.
    Type: Application
    Filed: November 1, 2013
    Publication date: October 1, 2015
    Applicant: KURARAY CO., LTD.
    Inventors: Tadahito Fukuhara, Yosuke Kumaki
  • Publication number: 20150259856
    Abstract: Provided is greaseproof paper that, when folded, shows little reduction in grease resistance at the folded portion. The greaseproof paper includes a paper base and a greaseproof layer provided on at least one surface of the paper base, wherein the greaseproof layer includes an ethylene-vinyl alcohol-vinyl ester copolymer (A) and a fatty acid derivative (B), contains 1 to 100 parts by mass of the component (B) per 100 parts by mass of the component (A), and is in an amount of 0.5 to 5.0 g/m2 in terms of dry mass. In the greaseproof paper, the ethylene-vinyl alcohol-vinyl ester copolymer (A) has a content of ethylene units of 1 to 15 mol %, has a total content of vinyl alcohol units and vinyl ester units of 85 to 99 mol %, and has a degree of polymerization of 300 to 2000. In the greaseproof paper, the fatty acid derivative (B) is a fatty acid amide compound.
    Type: Application
    Filed: September 2, 2013
    Publication date: September 17, 2015
    Applicant: KURARAY CO., LTD.
    Inventors: Yosuke Kumaki, Masako Kawagoe
  • Patent number: 6689919
    Abstract: The synthesis of fluoropolyarylene ether with a high degree of polymerization is enabled, by using a copper complex catalyst with an oxidation potential in the range of −1V to 2V, for the oxidative polymerization of fluorophenols that contain at least one hydrogen atom as well as a fluorine atom bonded to the carbon atoms constituting the benzene ring.
    Type: Grant
    Filed: September 7, 2001
    Date of Patent: February 10, 2004
    Assignee: Japan Science and Technology Corporation
    Inventors: Eishun Tsuchida, Kenichi Oyaizu, Yosuke Kumaki, Kei Saito