Patents by Inventor Muneharu Makita

Muneharu Makita 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: 4647636
    Abstract: A process for preparing a highly water-absorbent resin by a reversed-phase suspension polymerization method using an aqueous solution of a monomer containing an alkali metal salt of acrylic or methacrylic acid, water-soluble polymerization initiator, protective colloid, hydrophobic organic solvent and if required, dispersing agent, the process being characterized in that the protective colloid is a copolymer comprising:(A) about 50 to about 97 mole % of styrene and/or alkyl-substituted derivative thereof,(B) 0 to about 50 mole % of dialkylaminoalkyl acrylate or methacrylate and/or dialkylaminoalkyl acrylamide or methacrylamide,(C) about 3 to about 15 mole % of glycidyl acrylate and/or glycidyl methacrylate and(D) 0 to about 30 mole % of an unsaturated monomer which can be copolymerized with the component A, B or C.
    Type: Grant
    Filed: September 11, 1985
    Date of Patent: March 3, 1987
    Assignee: Arakawa Kagaku Kogyo Kabushiki Kaisha
    Inventors: Muneharu Makita, Jun-ichi Maeno
  • Patent number: 4587308
    Abstract: A method for easily, inexpensively and efficiently producing an improved water-absorbent resin having a high water absorbency and a high water absorption rate and capable of forming a gel having a high gel strength and nonstickiness, in which water-absorbent resin particles which contain water and a crosslinking agent and are in the semi-swollen state are agitated at an elevated temperature in the presence of an inert inorganic powder to conduct the crosslinking of the resin, while removing water, the water-absorbent resin containing a monomer units having a carboxyl group in the form of free acid or a metal salt.
    Type: Grant
    Filed: February 4, 1985
    Date of Patent: May 6, 1986
    Assignee: Arakawa Kagaku Kogyo Kabushiki Kaisha
    Inventors: Muneharu Makita, Shozo Tanioku
  • Patent number: 4507376
    Abstract: An electrophotographic toner composition having excellent blocking resistance and offset resistance which contains as a resin binder a polymeric rosin compound having a softening point of to C., a glass transition temperature of to C. and a molecular weight of 2,000 to 40,000 prepared by the reaction of (a) a glycidyl ester of rosin, (b) a dicarboxylic acid or its anhydride, and (c) a crosslinking agent selected from the group consisting of a polyfunctional epoxy compound, a polycarboxylic acid having a valency of not less than 3 or its anhydride, and a polyhydric alcohol having a valency of not less than 3. A dihydric alcohol may be used in the above reaction in order to improve the low temperature fixing property of the toner.
    Type: Grant
    Filed: July 15, 1983
    Date of Patent: March 26, 1985
    Assignee: Arakawa Kagaku Kogyo Kabushiki Kaisha
    Inventors: Muneharu Makita, Osamu Oseto, Toshiaki Munemitsu