Patents by Inventor Shunichi Kawata

Shunichi Kawata 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).

  • Epoxy resin composition
    Patent number: 4593069
    Abstract: An epoxy resin composition comprising an epoxy resin, either 2-vinyl-4,6-diamino-s-triazine or 2-vinyl-4,6-diamino-s-triazine/isocyanuric acid adduct, and at least one compound selected from dicyandiamide, polyvinyl-p-phenol and specific imidazole compounds. The composition is useful, for example, in inks, insulating paints and adhesives for printed circuit base boards and in copper-clad laminated boards.
    Type: Grant
    Filed: June 21, 1985
    Date of Patent: June 3, 1986
    Assignees: Shikoku Chemicals Corp., Shikoku Finechemicals Corp.
    Inventors: Kazuo Kamagata, Toshiaki Yamada, Shunichi Kawata, Takashi Mizui
  • Novel imidazole-isocyanuric acid adducts and utilization thereof
    Patent number: 4205156
    Abstract: An imidazole-isocyanuric acid adduct having the following general formula is disclosed: ##STR1## wherein R.sub.1 is a member selected from the group consisting of a hydrogen atom, a .beta.-cyanoethyl group and a .beta.-[3,5-diamino-S-triazinyl-(1)]-ethyl group, R.sub.2 stands for a monovalent hydrocarbon group having up to 17 carbon atoms, R.sub.3 is a member selected from the group consisting of a hydrogen atom and an alkyl group having up to 4 carbon atoms, with the proviso that when R.sub.1 is a hydrogen atom, R.sub.2 is a methyl or phenyl group and R.sub.3 is a hydrogen atom and when R.sub.1 is a .beta.-cyanoethyl group, R.sub.2 is a phenyl group and R.sub.3 is a hydrogen atom, and n is a number of from 0 to 2.This adduct has peculiar characteristics not possessed by ordinary salts. Namely, the adduct is stable in water, and it decomposes in a solvent or under heating. The adduct is valuable as a curing agent for epoxy resins, and it can be utilized for purification of imidazoles.
    Type: Grant
    Filed: January 22, 1979
    Date of Patent: May 27, 1980
    Assignee: Shikoku Chemicals Corporation
    Inventors: Natsuo Sawa, Tadao Nomoto, Keiko Iuchi, Toshihiro Suzuki, Shunichi Kawata
  • Imidazole-isocyanuric acid adducts
    Patent number: 4189577
    Abstract: An imidazole-isocyanuric acid adduct having the following formula is disclosed: ##STR1## wherein R.sub.1 is a member selected from the group consisting of a hydrogen atom, a .beta.-cyanoethyl group and a .beta.-[3,5-diamino-s-triazinyl-(1)]-ethyl group, R.sub.2 stands for a monovalent hydrocarbon group having up to 17 carbon atoms, R.sub.3 is a member selected from the group consisting of a hydrogen atom and an alkyl group having up to 4 carbon atoms, with the proviso that when R.sub.1 is a hydrogen atom, R.sub.2 is a methyl or phenyl group and R.sub.3 is a hydrogen atom and when R.sub.1 is a .beta.-cyanoethyl group, R.sub.2 is a phenyl group and R.sub.3 is a hydrogen atom, and n is a number of from 0 to 2.This adduct has peculiar characteristics not possessed by ordinary salts. Namely, the adduct is stable in water, and it decomposes in a solvent or under heating. The adduct is valuable as a curing agent for epoxy resins, and it can be utilized for purification of imidazoles.
    Type: Grant
    Filed: March 13, 1978
    Date of Patent: February 19, 1980
    Assignee: Shikoku Chemicals Corporation
    Inventors: Natsuo Sawa, Tadao Nomoto, Keiko Iuchi, Toshihiro Suzuki, Shunichi Kawata