Patents by Inventor Kiyonobu Marubashi

Kiyonobu Marubashi 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).

  • Thermo-reversible elastomer composition comprising a liquid chloroprene polymer and a polyvalent metal oxide or hydroxide
    Patent number: 4205150
    Abstract: A liquid chloroprene polymer having substantially at least one carboxyl group in the molecule and having a number average molecular weight of about 500 to about 20,000 which is produced by(1) homopolymerizing a chloroprene monomer or(2) copolymerizing a chloroprene monomer with a monomer copolymerizable with a chloroprene monomer,in the presence of an organic solvent and about 0.5 to about 20 parts by weight of a mercaptocarboxylic acid per 100 parts by weight of the monomers. The liquid polymer is reacted with a polyvalent metal oxide or hydroxide to form a thermo-reversible elastomeric composition.
    Type: Grant
    Filed: April 10, 1978
    Date of Patent: May 27, 1980
    Assignee: Denki Kagaku Kogyo Kabushiki Kaisha
    Inventor: Kiyonobu Marubashi
  • Flexible epoxy resin composition
    Patent number: 4170613
    Abstract: A settable flexible epoxy resin composition comprising:(A) 100 parts by weight of an epoxy resin, and(B) 5 to 200 parts by weight of a liquid chloroprene copolymer having a number average molecular weight of about 500 to about 10,000 and prepared by copolymerizing70 to 99 parts by weight of (i) a chloroprene monomer or (ii) at least 50% by weight of a chloroprene monomer plus a monomer copolymerizable therewith, and1 to 30 parts by weight of one or more monomers selected from the group consisting of(a) an unsaturated glycidyl ester represented by the formula (I): ##STR1## wherein R is a hydrogen atom, a methyl group or an ethyl group; (B) A POLYFUNCTIONAL ACRYLATE OR A POLYFUNCTIONAL METHACRYLATE; AND(c) an unsaturated carboxylic acid;In the presence of 0.5 to 20 parts by weight of a mercaptocarboxylic acid based on 100 parts by weight of the monomers.
    Type: Grant
    Filed: April 10, 1978
    Date of Patent: October 9, 1979
    Assignee: Denki Kagaku Kogyo Kabushiki Kaisha
    Inventor: Kiyonobu Marubashi
  • Process for curing liquid chloroprene polymer containing xanthate active terminal groups using polyfunctional amines
    Patent number: 4054731
    Abstract: A process for preparing a chloroprene-based liquid polymer having active terminal groups substantially at the terminals thereof comprising polymerizing chloroprene alone or in combination with one or more monomers copolymerizable with chloroprene in (1) an organic solvent having a boiling point of about 160.degree. C or less at atmospheric pressure and selected from the group consisting of aromatic hydrocarbons, aliphatic halogenated hydrocarbons and cyclic ethers, or (2) in carbon disulfide, which is present in an amount of about 20 to 200 parts by weight per 100 parts by weight of the total monomer, in the presence of a xanthogen disulfide compound represented by the formula: ##STR1## wherein R can contain from 1 to 12 carbon atoms and is an alkyl group, an aryl group, an aralkyl group or a cycloaliphatic group, which is present in an amount substantially equal to a ratio of about 2.5 to 20 parts by weight of diethyl xanthogen disulfide per 100 parts by weight of the total monomer.
    Type: Grant
    Filed: July 17, 1975
    Date of Patent: October 18, 1977
    Assignee: Denki Kagaku Kogyo Kabushiki Kaisha
    Inventors: Kiyonobu Marubashi, Hideji Oshima, Yasuaki Sakano