DIENE RUBBER, PROCESS FOR PRODUCTION THEREOF, RUBBER COMPOSITIONS, PROCESS FOR PRODUCING THE SAME, AND CROSSLINKED RUBBERS

Title:

DIENE RUBBER, PROCESS FOR PRODUCTION THEREOF, RUBBER COMPOSITIONS, PROCESS FOR PRODUCING THE SAME, AND CROSSLINKED RUBBERS

Document Type and Number:

WIPO Patent Application WO/2003/078482

Kind Code:

A1

Abstract:

A diene rubber (A) having a weight-average molecular weight (Mw) of 100,000 to 3,000,000, a weight-average molecular weight/number-average molecular weight ratio (Mw/Mn) of 1.30 to 2.50, and a weight-average molecular weight/peak top molecular weight ratio (Mw/Mp) of 0.70 to 1.30. Rubber compositions obtained by blending the diene rubber (A) with a diene rubber (B) having an Mw of 2,000 to 90,000 and/or an extender oil for rubber retain good processability and can give crosslinked rubbers having high tensile strength and wear resistance. The diene rubber (A) can be produced by conducting living polymerization in a hydrocarbon solvent, adding a short-stopper to the polymerization system in the stage wherein the conversion lies between 5 % and 98 % to thereby deactivate 10 to 90 mole % of the active terminals present at the initiation of polymerization, and finally adding a short-stopper additionally to the resulting system to stop the reaction completely.

Inventors:

KARATO TAKESHI (JP)
KOMATU MASAAKI (JP)
TAKASE KAZUHIRO (JP)

Application Number:

PCT/JP2003/003097

Publication Date:

September 25, 2003

Filing Date:

March 14, 2003

Export Citation:

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Assignee:

ZEON CORP (JP)
KARATO TAKESHI (JP)
KOMATU MASAAKI (JP)
TAKASE KAZUHIRO (JP)

International Classes:

B29C35/02; B60C1/00; C08F2/40; C08F2/42; C08F36/04; C08F36/06; C08F236/10; C08K3/04; C08K3/36; C08L9/00; C08L9/06; B29K9/00; B29K105/06; B29K105/24; (IPC1-7): C08F36/00; C08F2/40; C08L9/00

Domestic Patent References:

WO2001010919A1

2001-02-15

Foreign References:

JPH10158338A	1998-06-16
JPH1192509A	1999-04-06
EP0282437A2	1988-09-14

Other References: