Title:
METHOD FOR PRODUCING GRAFT POLYMER, GRAFT POLYMER, RUBBER COMPOSITION, AND TIRE
Document Type and Number:
Japanese Patent JP2021175771
Kind Code:
A
Abstract:
To provide a method for producing a copolymer which is excellent in ozone resistance and can improve crack growth resistance of a rubber composition by being blended into the rubber composition.SOLUTION: A method for producing a graft polymer which comprises a backbone polymer moiety containing a non-conjugated olefin unit and an aromatic vinyl unit, and a branch polymer moiety bonded to the backbone polymer moiety and containing a conjugated diene unit includes: a step A of copolymerizing one or more non-conjugated olefin compounds and one or more aromatic vinyl compounds to form the backbone polymer moiety; and a step B of graft-polymerizing one or more conjugated diene compounds onto the backbone polymer moiety to form the branch polymer moiety. At least one of the aromatic vinyl compounds used in the step A has one or more alkyl groups bonded to an aromatic ring.SELECTED DRAWING: None
Inventors:
TARDIF OLIVIER
KOTANI KYOHEI
TANAKA TAKASHI
KOTANI KYOHEI
TANAKA TAKASHI
Application Number:
JP2020081396A
Publication Date:
November 04, 2021
Filing Date:
May 01, 2020
Export Citation:
Assignee:
BRIDGESTONE CORP
International Classes:
B60C13/00; C08F255/02; C08F257/02
Attorney, Agent or Firm:
Kenji Sugimura
Mitsutsugu Sugimura
Kazuyuki Tomita
Mitsutsugu Sugimura
Kazuyuki Tomita
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