Patents by Inventor Kazuhiro Takase

Kazuhiro Takase 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).

  • Rubber composition containing cyclic polysulfide as vulcanization agent and pneumatic tire using the same
    Patent number: 7569639
    Abstract: A rubber composition containing 100 parts by weight a sulfur-vulcanizable rubber (A) and 0.1 to 30 parts by weight of a vulcanization agent of a cyclic polysulfide (B) having the formula (I): wherein R is a substituted or unsubstituted C2 to C20 alkylene group, substituted or unsubstituted C2 to C20 oxyalkylene group or alkylene group having an aromatic ring, n is an integer of 1 to 20, x is a number of 2 to 6 on average.
    Type: Grant
    Filed: October 13, 2004
    Date of Patent: August 4, 2009
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Wonmun Choi, Tomoyuki Matsumura, Naoya Amino, Kazuhiro Takase, Daisuke Kanenari, Takeshi Hotaka, Junichirou Natori
  • Rubber composition containing cyclic polysulfide as vulcanizer and pneumatic tire made therefrom
    Publication number: 20060094831
    Abstract: A rubber composition containing 100 parts by weight a sulfur-vulcanizable rubber (A) and 0.1 to 30 parts by weight of a vulcanization agent of a cyclic polysulfide (B) having the formula (I): wherein R is a substituted or uhsubstituted C2 to C20 alkylene group, substituted or unsubstituted C2 to C20 oxyalkylene group or alkylene group having an aromatic ring, n is an integer of 1 to 20, x is a number of 2 to 6 on average.
    Type: Application
    Filed: October 13, 2004
    Publication date: May 4, 2006
    Inventors: Wonmun Choi, Tomoyuki Matsumura, Naoya Amino, Kazuhiro Takase, Daisuke Kanenari, Takeshi Hotaka, Junichirou Natori
  • Diene rubber, process for production thereof, rubber compositions, process for producing the same, and crosslinked rubbers
    Patent number: 6984706
    Abstract: A diene rubber (A) having a weight average molecular weight (Mw) of 100,000 to 3,000,000, an Mw/number average molecular weight (Mn) ratio of 1.30 to 2.50, and an Mw/peak top molecular weight (Mp) ratio 0.70 to 1.30. A rubber composition comprising the diene rubber (A) and a diene rubber (B) having an Mw of 2,000 to 90,0000 and/or an oil extender for rubber has good processability and can give a rubber vulcanizate having high tensile strength and good abrasion resistance. The diene rubber (A) is produced by conducting a living polymerization of diene monomer in a hydrocarbon solvent; adding a polymerization stopper to a polymerization mixture at a conversion of 5 to 98% to deactivate 10 to 90% by mole of active terminals present as of the initiation of polymerization; and finally adding a polymerization stopper to completely terminate the polymerization reaction.
    Type: Grant
    Filed: March 14, 2003
    Date of Patent: January 10, 2006
    Assignee: Zeon Corporation
    Inventors: Takeshi Karato, Masaaki Komatu, Kazuhiro Takase
  • Diene rubber, process for production thereof, rubber compositions, process for producing the same, and crosslinked rubbers
    Publication number: 20050154156
    Abstract: A diene rubber (A) having a weight average molecular weight (Mw) of 100,000 to 3,000,000, an Mw/number average molecular weight (Mn) ratio of 1.30 to 2.50, and an Mw/peak top molecular weight (Mp) ratio 0.70 to 1.30. A rubber composition comprising the diene rubber (A) and a diene rubber (B) having an Mw of 2,000 to 90,0000 and/or an oil extender for rubber has good processability and can give a rubber vulcanizate having high tensile strength and good abrasion resistance. The diene rubber (A) is produced by conducting a living polymerization of diene monomer in a hydrocarbon solvent; adding a polymerization stopper to a polymerization mixture at a conversion of 5 to 98% to deactivate 10 to 90% by mole of active terminals present as of the initiation of polymerization; and finally adding a polymerization stopper to completely terminate the polymerization reaction.
    Type: Application
    Filed: March 14, 2003
    Publication date: July 14, 2005
    Applicant: ZEON CORP.
    Inventors: Takeshi Karato, Masaaki Komatu, Kazuhiro Takase