# US 2019/0169407 A1 · Rubber blend, sulfur-crosslinkable rubber mixture, and vehicle tire

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- Number: US 2019/0169407 A1
- Document ID: US20190169407A1
- Status: Published application
- Kind: A1
- Application number: 16/325,193
- Filed: 2017-08-14
- Published: 2019-06-06
- Earliest claimed: 2016-08-17
- Assignees: Continental Reifen Deutschland GmbH
- Applicants: Continental Reifen Deutschland GmbH
- Inventors: Carla Recker; Catarina Sa; Kathrin Wehming-Bomkamp; Viktoria Pavon Sierra; Norbert Mueller; Michael Radke
- Web page: https://patentgrep.com/patent/US20190169407A1

## CPC

- C08L 9/06: Copolymers with styrene
- 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}
- B60C 11/0008: {characterised by the tread rubber}
- C08C 19/25: Incorporating silicon atoms into the molecule
- C08C 19/44: of polymers containing metal atoms exclusively at one or both ends of the skeleton
- C08L 15/00: Compositions of rubber derivatives (C08L11/00, C08L13/00 take precedence)
- C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
- C08L 2205/03: containing three or more polymers in a blend
- C08L 2205/035: containing four or more polymers in a blend
- 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
- C08C: TREATMENT OR CHEMICAL MODIFICATION OF RUBBERS

## Abstract

The invention relates to a sulfur-crosslinkable rubber mixture comprising a rubber blend composed of at least one solution-polymerized diene polymer A of high molecular weight and at least one solution-polymerized polymer B of low molecular weight, wherein at least one of polymers A and B has been functionalized at the chain end and/or along the polymer chain and/or at a coupling site with at least one group selected from epoxy groups, hydroxyl groups, carboxyl groups, silane sulfide groups, amino groups, siloxane groups, organosilicon groups, phthalocyanine groups and amino group-containing alkoxysilyl groups, 30 to 300 phr of at least one silica and 1 to 20 phf of at least one substance of formula I) as silane coupling agent (R1R2R3)Si—S4—Si(R3R2R1) II) where R1, R2, R3 in the structure may be the same or different and may be selected from linear or branched alkoxy, cycloalkoxy, alkyl, cycloalkyl or aryl groups having 1 to 20 carbon atoms.

## Claims

### Claim at position 1

-14. (canceled)

### Claim 15

A rubber blend comprising:
at least one solution-polymerized diene polymer A of high molecular weight, formed from at least one conjugated diene and one or more optional vinylaromatic compound(s), wherein the one or more optional vinylaromatic compound(s) have a content of vinylaromatic compound of 0% to 50% by weight, a vinyl content of 8% to 80% by weight based on any diene content present, and wherein the one or more optional vinylaromatic compound(s), has a glass transition temperature Tg according to DSC of −100° C.<Tg<+20° C., a molecular weight Mw according to GPC of more than 350000 g/mol and a polydispersity PD of 1.1<PD<3;
at least one solution-polymerized polymer B of low molecular weight, formed from at least one conjugated diene, at least one conjugated diene and one or more vinylaromatic compound(s), or at least one or more vinylaromatic compound(s), wherein the one or more vinylaromatic compound(s) has a content of vinylaromatic compound of 0% to 50% by weight, a vinyl content of 8% to 80% by weight based on any diene content present, and wherein the one or more vinylaromatic compound(s) has a glass transition temperature Tg according to DSC of −100° C.<Tg<+80° C., a molecular weight Mw according to GPC of 1300 g/mol<Mw<10000 g/mol and a polydispersity PD of 1<PD<1.5;
30 to 300 phr of at least one silica; and,
1 to 20 phf of at least one substance of formula I) as a silane coupling agent:
(R1R2R3)Si—S4—Si(R3R2R1) I)
wherein R1, R2, R3 in the structure may be the same or different and may be selected from linear or branched alkoxy, cycloalkoxy, alkyl, cycloalkyl or aryl groups having 1 to 20 carbon atoms;
wherein at least one of polymers A and B has been functionalized at the chain end and/or along the polymer chain and/or at a coupling site with at least one group selected from epoxy groups, hydroxyl groups, carboxyl groups, silane sulfide groups, amino groups, siloxane groups, organosilicon groups, phthalocyanine groups and amino group-containing alkoxysilyl groups.

### Claim 16 (depends on 15)

The rubber blend as claimed in claim 15, wherein at least the solution-polymerized polymer B of low molecular weight has been functionalized.

### Claim 17 (depends on 16)

The rubber blend as claimed in claim 16, wherein the solution-polymerized diene polymer A of high molecular weight has been functionalized.

### Claim 18 (depends on 15)

The rubber blend as claimed in claim 15, wherein at least one of polymer A and polymer B has been functionalized at the chain end with an amino group-containing alkoxysilyl group and at least one further amino group and/or at least one further alkoxysilyl group and/or at least one further amino group-containing alkoxysilyl group, wherein the amino groups are bonded to the chain end of the polymer chain with or without spacers.

### Claim 19 (depends on 15)

The rubber blend as claimed in claim 15, wherein at least one of the polymers A and B has been functionalized at the chain end and/or along the polymer chain and/or at a coupling site with a silane sulfide group.

### Claim 20 (depends on 15)

The rubber blend as claimed in claim 15, wherein at least one of the polymers A and B has been functionalized at the chain end and/or along the polymer chain and/or at a coupling site with a siloxane group.

### Claim 21 (depends on 15)

The rubber blend as claimed in claim 15, wherein at least one of the polymers A and B has coupling sites.

### Claim 22 (depends on 15)

The rubber blend as claimed in claim 15 comprising 5 to 100 phr of the at least one solution-polymerized polymer B of low molecular weight, based on the at least one solution-polymerized diene polymer A of high molecular weight.

### Claim 23 (depends on 15)

The rubber blend as claimed in claim 15 having a Mooney viscosity (ML1+4, 100° C. according to ASTM-D 1646) of 40 to 100 Mooney units.

### Claim 24 (depends on 15)

The rubber blend as claimed in claim 15, wherein the proportion of the diene polymer A of the rubber blend in the rubber mixture is at least 50 phr based on the total amount of solid rubbers present in the rubber mixture.

### Claim 25 (depends on 15)

The rubber blend as claimed in claim 15, wherein the at least one substance of formula I) is bis(3-triethoxysilylpropyl) tetrasulfide (TESPT).

### Claim 26 (depends on 15)

The rubber blend as claimed in claim 15, comprising 0.1 to 20 phr of carbon black.

### Claim 27 (depends on 26)

A vehicle tire in which at least one component includes the with sulfur-crosslinked rubber mixture as claimed in claim 26.

### Claim 28 (depends on 27)

The vehicle tire as claimed in claim 27, wherein at least the part of a tread that comes into contact with a driving surface comprises the sulfur-crosslinked rubber mixture.