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Title:
METHOD FOR PRODUCING VULCANIZED RUBBER COMPOSITION, VULCANIZED RUBBER COMPOSITION, AND STUDLESS TIRE USING SAME
Document Type and Number:
WIPO Patent Application WO/2016/076424
Kind Code:
A1
Abstract:
This method for producing a vulcanized rubber composition comprises (a) a step for preparing a master batch including a butadiene rubber and silica, (b) a step for preparing a master batch including an isoprene-based rubber and silica, (c) a step for kneading the master batch of (a) and the master batch of (b), and (d) a step for vulcanizing the kneaded product obtained in (c), wherein: the obtained vulcanized rubber composition has a BR phase and an IR phase that are incompatible with one another, and includes a predetermined amount of a terpene-based resin; the abundance ratio α of silica in a predetermined BR phase is 0.3 ≤ α ≤ 0.7 (formula 1); and the proportion β of the butadiene rubber is 0.4 ≤ β ≤ 0.8 (formula 2). Accordingly, this method can improve on-ice performance, wet performance, and wear resistance in a balanced manner, and can provide: a vulcanized rubber composition that has excellent on-ice performance, wet performance, and wear resistance; and a studless tire using said vulcanized rubber composition as a constituent of a tread.

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Inventors:
TAKENAKA MIKAKO (JP)
KOJIMA RYOJI (JP)
Application Number:
PCT/JP2015/082010
Publication Date:
May 19, 2016
Filing Date:
November 13, 2015
Export Citation:
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Assignee:
SUMITOMO RUBBER IND (JP)
International Classes:
C08J3/22; B60C1/00; C08K3/36; C08L9/00; C08L45/00; C08L91/00
Domestic Patent References:
WO2012073838A12012-06-07
WO2011099395A12011-08-18
WO2015076048A12015-05-28
Foreign References:
JP2014145063A2014-08-14
JPH06248117A1994-09-06
JP2010126672A2010-06-10
JPH1160812A1999-03-05
JP2003292676A2003-10-15
JP2015229701A2015-12-21
Other References:
See also references of EP 3199574A4
Attorney, Agent or Firm:
ASAHINA & CO. (JP)
Patent business corporation ASAHINA & CO. Patent Attotneys (JP)
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