# US 10,246,576 B2 · Sulfur-crosslinkable rubber mixture and motor vehicle tires

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- Number: US 10,246,576 B2
- Document ID: US10246576B2
- Status: Granted
- Kind: B2
- Application number: 15/024,968
- Filed: 2014-07-11
- Published: 2016-08-11
- Granted: 2019-04-02
- Earliest claimed: 2013-09-27
- Assignees: Continental Reifen Deutschland GmbH
- Applicants: Continental Reifen Deutschland GmbH
- Inventors: Fabian Peters; Thorsten Torbrügge; Carla Recker
- Web page: https://patentgrep.com/patent/US10246576B2

## CPC

- C08L 7/00: Compositions of natural rubber
- B29B 7/7495: {for mixing rubber}
- B60C 1/00: Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C 1/0016: {Compositions of the tread}
- C08L 2312/00: Crosslinking
- Y02T 10/86: Optimisation of rolling resistance, e.g. weight reduction
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- B29B: PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A sulfur-crosslinkable rubber mixture includes from 40 to 100 phr of at least one natural and/or synthetic polyisoprene, and 15 phr or more of at least one hydrocarbon resin which is built up to the extent of 50 to 100 wt. % from aliphatic C5 monomers and to the extent of 0 to 50 wt. % from further monomers, where the hydrocarbon resin according to formula I) has a Q of from 0.015 [° C.·mol/g] to 0.050 [° C.·mol/g]. Formula I) is defined as Q=softening point [° C.]/centrifuge average Mc [g/mol]. In some aspects, the sulfur-crosslinkable rubber mixture includes 15 to 300 phr of the hydrocarbon resin, or even from 36 to 100 phr of the hydrocarbon resin. The further monomer(s) is or are selected from the group of unsaturated compounds, which can be polymerized cationically, which includes aromatics and/or unsaturated terpenes and/or alkenes and/or cycloalkenes.

## Claims

### Claim 1

A sulfur-crosslinkable rubber mixture comprising:
from 40 to 100 phr of at least one natural and/or synthetic polyisoprene;
15 phr or more of at least one hydrocarbon resin which is built up to the extent of 50 to 100 wt. % from aliphatic C5 monomers and to the extent of 0 to 50 wt. % from further monomers, wherein the hydrocarbon resin according to formula I) has a Q of from 0.015 [° C.·mol/g] to 0.050 [° C.·mol/g], wherein formula I) is defined as Q=softening point [° C.]/centrifuge average Mc [g/mol]; and,
70 to 250 phr of at least one silica;
wherein, after vulcanization, the sulfur-crosslinkable rubber mixture has an elongation at break of from 651% to 722% at room temperature, in accordance with DIN 53 504.

### Claim 2 (depends on 1)

The sulfur-crosslinkable rubber mixture of claim 1 comprising 15 to 300 phr of the hydrocarbon resin.

### Claim 3 (depends on 1)

The sulfur-crosslinkable rubber mixture of claim 1 comprising 36 to 100 phr of the hydrocarbon resin.

### Claim 4 (depends on 1)

The sulfur-crosslinkable rubber mixture of claim 1 wherein the further monomer(s) is or are selected from the group of unsaturated compounds, which can be polymerized cationically, comprising aromatics and/or unsaturated terpenes and/or alkenes and/or cycloalkenes.

### Claim 5 (depends on 4)

The sulfur-crosslinkable rubber mixture of claim 4 wherein the further monomer(s) is or are selected from the group consisting of alpha-methylstyrene and/or styrene and/or vinyltoluene and/or indene and/or coumarone and/or methylindene and/or methylcoumarone and/or phenol and/or olefins.

### Claim 6 (depends on 1)

The sulfur-crosslinkable rubber mixture of claim 1 wherein the hydrocarbon resin has a softening point according to ASTM E 28 (ring and ball) of from 60 to 99° C.

### Claim 7 (depends on 1)

The sulfur-crosslinkable rubber mixture of claim 1 wherein the hydrocarbon resin has a molecular weight Mw (weight average) of from 500 to 4,000 g/mol and a centrifuge average Mc of from 2,500 to 10,000 g/mol.

### Claim 8 (depends on 1)

The sulfur-crosslinkable rubber mixture of claim 1 comprising 80 to 180 phr of at least one silica.

### Claim 9 (depends on 1)

A vehicle pneumatic tire comprising the sulfur-crosslinkable rubber mixture of claim 1.

### Claim 10 (depends on 9)

The vehicle pneumatic tire as claimed in claim 9, wherein the sulfur-crosslinkable rubber mixture is comprised in a tread of the vehicle pneumatic tire.