Patents by Inventor Kenji Kageno

Kenji Kageno 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).

  • Process for producing aqueous solution of monoallylamine polymer
    Patent number: 6579933
    Abstract: A high-molecular-weight monoallylamine polymer aqueous solution containing a monoallylamine polymer having a weight average molecular weight of 20,000 to 180,000 is prepared by polymerizing a monoallylamine sulfate in an aqueous medium in the presence of a specific radical polymerization initiator, and thereby providing the above high-molecular-weight monoallylamine polymer in an aqueous solution. High-molecular-weight monoallylamine polymer for various uses can be efficiently prepared.
    Type: Grant
    Filed: November 16, 2000
    Date of Patent: June 17, 2003
    Assignee: Nitto Boseki Co., Ltd.
    Inventors: Ikuo Hayashi, Hiroyuki Takayama, Kenji Kageno
  • Preparation of polymers of monoallylamine and diallylamine derivatives with azo catalyst
    Patent number: 4812540
    Abstract: A monoallylamine-diallylamine derivative copolymer with a high degree of polymerization can be obtained in a high yield by using a radical initiator containing an azo group and a group having cationic nitrogen atom in the molecule.
    Type: Grant
    Filed: May 12, 1987
    Date of Patent: March 14, 1989
    Assignee: Nitto Boseki Co., Ltd.
    Inventors: Kenji Kageno, Toshio Ueda, Susumu Harada
  • Method for improving color fastness of reactive dyes on cellulose with allylamine copolymer
    Patent number: 4678474
    Abstract: The present invention relates to a method for improving the color fastness of a dyed product which comprises treating a dyed product which has been dyed with a reactive dye with a copolymer of an N-substituted secondary allylamine derivative represented by the following general formula:CH.sub.2 .dbd.CH--CH.sub.2 --HN--R.HXwherein R represents a hydrocarbon group or a substituted hydrocarbon group and HX represents an inorganic or organic acid, and allylamine, diallylamine or dimethyldiallylammonium chloride.The dyed product treated according to the method of the present invention satisfies the following requirements on performances: (1) a sufficient maintenance to fastness to chlorine, (2) a satisfactory resistance to acid hydrolysis, (3) freeness from the color change due to the treatment, (4) freeness from the decrease in fastness to light and (5) high fastnesses to water and washing.
    Type: Grant
    Filed: March 27, 1986
    Date of Patent: July 7, 1987
    Assignee: Nitto Boseki Co., Ltd
    Inventors: Toshio Ueda, Kenji Kageno, Susumu Harada
  • Polymers of N-substituted secondary monoallylamines and their salts and process for producing the same
    Patent number: 4644042
    Abstract: N-substituted secondary monoallylamine salts can be easily polymerized in a polar solvent by using as catalyst a water-soluble radical initiator containing azo group in the molecule, and polymers with a high degree of polymerization can be obtained therefrom in a high yield.
    Type: Grant
    Filed: August 27, 1985
    Date of Patent: February 17, 1987
    Assignee: Nitto Boseki Co., Ltd.
    Inventors: Toshio Ueda, Kenji Kageno, Kiyoshi Shimizu, Sakuro Hasegawa, Susumu Harada