US11097572B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11097572-B2 |
| Application number | US-201916982164-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 19, 2019 |
| Priority date | Mar 22, 2018 |
| Publication date | Aug 24, 2021 |
| Grant date | Aug 24, 2021 |
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Official abstract text for this publication.
A pneumatic tire includes 100 parts by mass of a rubber component including from 25-30 parts by mass of a diene rubber having a glass transition temperature of from −20° C. to −40° C., having a tertiary amine having an epoxy group as a modifying group, and a vinyl content from 35-45 mass %, 20-35 parts by mass of a diene rubber obtained by reacting a polyorganosiloxane to an active terminal of a diene-based polymer chain having the active terminal formed by making a polymer block A continuous with a polymer block B, the polymer block A including 80-95 mass % of isoprene and 5-20 mass % of an aromatic vinyl, having an active terminal, and having a weight average molecular weight from 500-15,000, the polymer block B including 1,3-butadiene and an aromatic vinyl and an active terminal, the vinyl content lower by from 5-25 mass % than that of the first conjugated diene polymer.
Opening claim text (preview).
The invention claimed is: 1. A rubber composition for a tire comprising 100 parts by mass of a diene rubber composed of from 25 parts by mass to 30 parts by mass of a first conjugated diene rubber having a vinyl content from 35 mass % to 45 mass %, 20 parts by mass to 35 parts by mass of a second conjugated diene rubber having a vinyl content lower by from 5 mass % to 25 mass % than that of the first conjugated diene rubber, and from 35 parts by mass to 50 parts by mass of a modified conjugated diene polymer, the first conjugated diene rubber having a glass transition temperature of from −20° C. to −40° C. and having a tertiary amine having an epoxy group as a modifying group, the second conjugated diene rubber obtained by reacting a polyorganosiloxane to an active terminal of a conjugated diene-based polymer chain having the active terminal formed by making a polymer block A continuous with a polymer block B, the conjugated diene-based polymer chain comprising the polymer block A that comprises from 80 mass % to 95 mass % of isoprene and from 5 mass % to 20 mass % of aromatic vinyl, has an active terminal, and has a weight average molecular weight from 500 to 15000 and the polymer block B that comprises 1,3-butadiene and an aromatic vinyl and has an active terminal, the modified conjugated diene polymer obtained by modifying an active terminal of a conjugated diene polymer having a cis-1,4-bond content of 75 mol % or greater with at least a hydrocarbyloxysilane compound. 2. The rubber composition for a tire according to claim 1 , wherein 80 parts by mass or less of a filler containing at least silica is compounded based on 100 parts by mass of the diene rubber, and a compounding proportion of silica in the filler is 80 mass % or greater. 3. A pneumatic tire comprising a tread portion formed by using the rubber composition for a tire described in claim 1 . 4. The pneumatic tire according to claim 3 , wherein at least four circumferential grooves comprising a pair of first main grooves extending in the tire circumferential direction and a pair of second main grooves extending outside the pair of the first main grooves in the tire circumferential direction are formed on both sides of a tire equator in a tread portion, a first land portion is defined between the pair of first main grooves, a second land portion is defined between the first main groove and the second main groove, a plurality of first sipes having a groove width of 1 mm or less and extending in the tire width direction and a plurality of lateral grooves having a groove width of more than 1 mm and extending in the tire width direction are formed in the first land portion, each of the plurality of first sipes and each of the plurality of lateral grooves are arranged at an identical angle with respect to the tire circumferential direction and connected to one another, and each of the plurality of first sipes and each of the plurality of lateral grooves are open to one of the pair of first main grooves. 5. The pneumatic tire according to claim 4 , wherein a plurality of second sipes extending in the tire width direction and a plurality of auxiliary grooves having a bent shape with one end being open to the second main groove and the other end being closed in the second land portion are formed in the second land portion, each of the plurality of second sipes is oriented in the identical direction to each of the plurality of first sipes, each of the plurality of auxiliary grooves comprise a first groove portion extending from the open end to the bent point and a second groove portion extending from the bend point to the closed end, and the intersection angle of the first groove portion with respect to the second sipes is in the range from 45° to 90°. 6. A pneumatic tire comprising a tread portion formed by using the rubber composition for a tire described in claim 2 . 7. The pneumatic tire according to claim 6 , wherein at least four circumferential grooves comprising a pair of first main grooves extending in the tire circumferential direction and a pair of second main grooves extending outside the pair of the first main grooves in the tire circumferential direction are formed on both sides of a tire equator in a tread portion, a first land portion is defined between the pair of first main grooves, a second land portion is defined between the first main groove and the second main groove, a plurality of first sipes having a groove width of 1 mm or less and extending in the tire width direction and a plurality of lateral grooves having a groove width of more than 1 mm and extending in the tire width direction are formed in the first land portion, each of the plurality of first sipes and each of the plurality of lateral grooves are arranged at an identical angle with respect to the tire circumferential direction and connected to one another, and each of the plurality of first sipes and each of the plurality of lateral grooves are open to one of the pair of first main grooves. 8. The pneumatic tire according to claim 7 , wherein a plurality of second sipes extending in the tire width direction and a plurality of auxiliary grooves having a bent shape with one end being open to the second main groove and the other end being closed in the second land portion are formed in the second land portion, each of the plurality of second sipes is oriented in the identical direction to each of the plurality of first sipes, each of the plurality of auxiliary grooves comprise a first groove portion extending from the open end to the bent point and a second groove portion extending from the bend point to the closed end, and the intersection angle of the first groove portion with respect to the second sipes is in the range from 45° to 90°.
Lateral grooves, i.e. having an angle of 45 to 90 degees to the equatorial plane · CPC title
Width of the sipe · CPC title
Patterns comprising block rows or discontinuous ribs · CPC title
Asymmetric patterns · CPC title
Compositions of the tread · CPC title
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