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Patent Searching and Data


Title:
RUBBER COMPOSITION AND TIRE
Document Type and Number:
WIPO Patent Application WO/2021/125300
Kind Code:
A1
Abstract:
A purpose of the present invention is to provide a rubber composition which can attain both reinforcing properties and low-loss characteristics on a high level. This rubber composition comprises a rubber ingredient, carbon black, and silica, and is characterized in that the silica has a CTAB-adsorption specific surface area of 250 m2/g or greater and, when examined by disk centrifuge particle-size analysis, has an aggregate diameter (DCPS) and a primary-particle diameter (DI) which satisfy the relationship 700≥DCPS 3/DI 3≥300 (1), that the rubber ingredient comprises at least one rubber selected from between natural rubber and polyisoprene rubber and at least one rubber selected from among modified butadiene rubbers and modified styrene/butadiene rubbers, and that the proportion of the content in mass of the carbon black to the total content in mass of the carbon black and the silica is 70% or higher.

Inventors:
TSUCHIDA KAZUTAKA (JP)
Application Number:
PCT/JP2020/047293
Publication Date:
June 24, 2021
Filing Date:
December 17, 2020
Export Citation:
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Assignee:
BRIDGESTONE CORP (JP)
International Classes:
B60C1/00; C08C19/25; C08K3/04; C08K3/36; C08L7/00; C08L15/00
Domestic Patent References:
WO2019117266A12019-06-20
WO2019221184A12019-11-21
WO2016140217A12016-09-09
Foreign References:
JP2017513786A2017-06-01
JP2017186533A2017-10-12
JP2011140612A2011-07-21
Other References:
See also references of EP 4079532A4
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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