Patents by Inventor Yoshiki Hasegawa

Yoshiki Hasegawa 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 emulsion polymer composition
    Patent number: 4973614
    Abstract: A process for producing an emulsion polymer composition which comprises (a) emulsion-polymerizing an ethylenically unsaturated monomer containing no amino group in the molecule in the presence of a water-insoluble epoxy resin to form an emulsion polymer as seed particles, and then (b) emulsion-polymerizing an ethylenically unsaturated monomer containing an amino group in the molecule and another ethylenically unsaturated monomer copolymerizable with it in the presence of the emulsion polymer formed in step (a); in which(1) the weight ratio of the ethylenically unsaturated monomer to the epoxy resin in step (a) is from 100:100 to 100:5,(2) the weight ratio of the amino group-containing ethylenically unsaturated monomer to the other ethylenically unsaturated monomer in step (b) is from 1:99 to 25:75,(3) the ethylenically unsaturated monomer in step (a) and/or (b) contains 1 to 10% by weight of an ethylenically unsaturated carboxylic acid,(4) the weight ratio of the ethylenically unsaturated monomer in step (a)
    Type: Grant
    Filed: September 9, 1988
    Date of Patent: November 27, 1990
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Fumio Yoshino, Yoshiki Hasegawa, Shinichi Yoshioka