Patent application EP20172343A (EP), filed 2020-04-30
Publication number: EP3744776A1
Title: RUBBER COMPOSITION FOR TIRE
Abstract: Provided are a rubber composition, for a tire, which allows combined performance of on-ice performance and wear resistance to be improved, and a tire in which the rubber composition is used. The rubber composition for a tire contains: a rubber component containing an isoprene-based rubber and a conjugated diene-based polymer; and water-soluble particles, and the water-soluble particles satisfy the following formula (I), D50≤30 (D50 in formula (I) represents a median particle size (µm) of the water-soluble particles.).
IPC codes: B60C   1/    00            A I
B60C  11/    00            A I
C08L   7/    00            A I
Claims: number: 1
text: A rubber composition for a tire, containing: a rubber component containing an isoprene-based rubber and a conjugated diene-based polymer; and water-soluble particles, wherein the water-soluble particles satisfy the following formula (I),  D 50 ≤ 30
number: 2
text: The rubber composition for a tire according to claim 1, wherein the water-soluble particles satisfy a relationship of the following formula (II),  A / D 50 ≥ 0.5
number: 3
text: The rubber composition for a tire according to claim 1 or 2, wherein an amount of the water-soluble particles per 100 parts by mass of the rubber component is not less than 10 parts by mass.
number: 4
text: The rubber composition for a tire according to any one of claims 1 to 3, wherein the amount of the water-soluble particles per 100 parts by mass of the rubber component is not less than 25 parts by mass.
number: 5
text: The rubber composition for a tire according to any one of claims 1 to 4, wherein
an amount of the isoprene-based rubber in 100% by mass of the rubber component is not less than 20% by mass,
an amount of the conjugated diene-based polymer in 100% by mass of the rubber component is not less than 20% by mass, and
a silica content in 100% by mass of a total amount of silica and carbon black is not less than 50% by mass.
number: 6
text: The rubber composition for a tire according to any one of claims 1 to 5,
wherein an amount of a liquid plasticizer per 100 parts by mass of the rubber component is not greater than 30 parts by mass.
number: 7
text: The rubber composition for a tire according to any one of claims 1 to 6,
wherein the conjugated diene-based polymer includes a conjugated diene-based polymer having a cis content not less than 90% by mass.
number: 8
text: The rubber composition for a tire according to any one of claims 1 to 7,
wherein the median particle size of the water-soluble particles is not less than 10 µm.
number: 9
text: The rubber composition for a tire according to any one of claims 1 to 8,
wherein
the rubber component further contains a styrene-butadiene rubber, and
an amount of the styrene-butadiene rubber per 100 parts by mass of the rubber component is not less than the amount of the water-soluble particles per 100 parts by mass of the rubber component.
number: 10
text: The rubber composition for a tire according to any one of claims 1 to 9, further containing particulate silica having a nitrogen adsorption specific surface area not less than 180 m<2>/g, wherein
an amount of the particulate silica per 100 parts by mass of the rubber component is not less than the amount of the water-soluble particles per 100 parts by mass of the rubber component.
number: 11
text: The rubber composition for a tire according to any one of claims 1 to 10, further containing a resin, wherein
an amount of the resin per 100 parts by mass of the rubber component is not less than the amount of the water-soluble particles per 100 parts by mass of the rubber component.
number: 12
text: The rubber composition for a tire according to any one of claims 1 to 11, further containing a resin, wherein
the resin is at least one resin selected from the group consisting of terpene-based resins, C5-based resins, and C9-based resins.
number: 13
text: A tire comprising a member produced by using the rubber composition according to any one of claims 1 to 12.
number: 14
text: The tire according to claim 13, wherein
the tire is a winter tire, and
the member is a tread (1).
number: 15
text: The tire according to claim 14, wherein the tread (1) has a maximum thickness not less than 5.5 mm.
Office action: search_report, dated 2020-12-02
Rejection reasons: novelty_epc_54
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Final disposition: pending (2020-12-02)