Title:
METHOD FOR PRODUCING VULCANIZED RUBBER COMPOSITION, VULCANIZED RUBBER COMPOSITION, AND STUDLESS TIRE USING SAME
Document Type and Number:
WIPO Patent Application WO/2016/076422
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 obtained in (a) and the master batch obtained in (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; the abundance ratio α of silica in a predetermined BR phase satisfies 0.3 ≤ α ≤ 0.7 (formula 1); and the proportion β of the butadiene rubber satisfies 0.4 ≤ β ≤ 0.8 (formula 2). Accordingly, this method can improve on-ice performance and wear resistance in a balanced manner, and can provide: a vulcanized rubber composition that has excellent on-ice performance and wear resistance; and a studless tire using said vulcanized rubber composition as a constituent of a tread.
Inventors:
TAKENAKA MIKAKO (JP)
KOJIMA RYOJI (JP)
KOJIMA RYOJI (JP)
Application Number:
PCT/JP2015/082008
Publication Date:
May 19, 2016
Filing Date:
November 13, 2015
Export Citation:
Assignee:
SUMITOMO RUBBER IND (JP)
International Classes:
C08J3/22; B60C1/00; C08K3/36; C08L9/00; C08L91/00
Domestic Patent References:
| WO2011099395A1 | 2011-08-18 | |||
| WO2015076048A1 | 2015-05-28 |
Foreign References:
| JP2014145063A | 2014-08-14 | |||
| JPH06248117A | 1994-09-06 | |||
| JPH1160812A | 1999-03-05 | |||
| JP2003292676A | 2003-10-15 | |||
| JP2015229701A | 2015-12-21 |
Other References:
See also references of EP 3199573A4
Attorney, Agent or Firm:
ASAHINA & CO. (JP)
Patent business corporation ASAHINA & CO. Patent Attotneys (JP)
Patent business corporation ASAHINA & CO. Patent Attotneys (JP)
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