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Patent Searching and Data


Title:
PNEUMATIC TIRE
Document Type and Number:
WIPO Patent Application WO/2018/105717
Kind Code:
A1
Abstract:
Provided is a pneumatic tire for which weight reduction can be achieved while maintaining excellent durability and steering stability. A pneumatic tire having a carcass layer (4) installed between a pair of bead portions (3), wherein the carcass layer (4) includes, as a carcass cord, a plurality of composite cords (20) which comprise a polyethylene terephthalate fiber yarn with a fineness of 420-1200 dtex and an aromatic polyamide fiber yarn with a fineness of 520-1200 dtex, and which have a total fineness of 940-2400 dtex and a twist coefficient K in the range of 1600-2400. The composite cords (20) have an intermediate elongation in the range of 2.0-4.5% under a load of 2.0 cN. The dimensional stability index composed of the sum of the dry heat shrinkage at 150°C and the intermediate elongation under a load of 2.0 cN falls within the range of 2.5-6.0%, and the ratio of the initial elastic modulus M1 in a load range of 0N-44N at 100°C with respect to the initial elastic modulus M0 in a load range of 0N-44N at 25°C falls within the range of 76-94%.

Inventors:
TAKENAKA Yuichi (Hiratsuka Factory, 2-1, Oiwake, Hiratsuka-sh, Kanagawa 01, 〒2548601, JP)
Application Number:
JP2017/044131
Publication Date:
June 14, 2018
Filing Date:
December 08, 2017
Export Citation:
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Assignee:
THE YOKOHAMA RUBBER CO., LTD. (36-11, Shimbashi 5-chome Minato-k, Tokyo 85, 〒1058685, JP)
International Classes:
B60C9/00; B60C13/00; B60C15/06; D02G3/48
Domestic Patent References:
WO2009063913A12009-05-22
WO2009063913A12009-05-22
Foreign References:
JPS6171204A1986-04-12
JPS63159543A1988-07-02
JPS6045401A1985-03-11
JP2016500769A2016-01-14
EP2912218A22015-09-02
JP2012030737A2012-02-16
Attorney, Agent or Firm:
SEIRYU PATENT PROFESSIONAL CORPORATION et al. (37 Kowa Building, 4-5 Tsukiji 1-chome, Chuo-k, Tokyo 45, 〒1040045, JP)
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