RUN-FLAT TIRE

WIPO Patent Application WO/2011/030431

A1

A run-flat tire using a rubber composition which can improve the processability without lowering the run-flat durability.  More specifically, a run-flat tire comprising a pair of bead parts (1), in each of which a bead core (6) is embedded and a bead filler (7) is located outside of the same in the tire radial direction, and a pair of side walls (2) which are respectively provided with a pair of side reinforcing rubber layers (8), characterized in that a rubber composition which comprises: a rubber component (A) having a weight-average molecular weight in terms of polystyrene measured by gel permeation chromatography of 150,000 to 2,000,000 and containing at least a natural rubber or a polyisoprene rubber; 0.1 to 30 parts by mass, per 100 parts by mass of the rubber component (A), of a low-molecular weight conjugated diene-based polymer (B) having a weight-average molecular weight in terms of polystyrene measured by gel permeation chromatography of 2,000 to 10,000; and 3 to 10 parts by mass, per 100 parts by mass of the rubber component (A), of sulfur; is used for at least one of the bead filler (7) and the side reinforcing rubber layers (8).

MATSUO SHIGEAKI (JP)
MASAKI KOJI (JP)

PCT/JP2009/065866

March 17, 2011

September 10, 2009

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BRIDGESTONE CORP (JP)
MATSUO SHIGEAKI (JP)
MASAKI KOJI (JP)

B60C1/00; B60C15/06; B60C17/00; C08L7/00; C08L9/00

JP2007276589A	2007-10-25
JP2008063364A	2008-03-21
JP2008106148A	2008-05-08
JP2007224305A	2007-09-06
JP2008031207A	2008-02-14
JP2005280534A	2005-10-13
JPH11302459A	1999-11-02
JP2003213040A	2003-07-30
JP2007510004A	2007-04-19

See also references of EP 2465704A4
F. F. WOLNY; J. J. LAMB, KAUTSUCH, GUMMI KUNSTOFFE, vol. 37, no. 7, 1984, pages 601 - 603

SUGIMURA, KENJI (JP)
Kenji Sugimura (JP)

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