# US 2013/0153102 A1 · Tire component containing syndiotactic-1,2-polybutadiene

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- Number: US 2013/0153102 A1
- Document ID: US20130153102A1
- Status: Published application
- Kind: A1
- Application number: 13/331,433
- Filed: 2011-12-20
- Published: 2013-06-20
- Earliest claimed: 2011-12-20
- Assignees: The Goodyear Tire & Rubber Company
- Inventors: Junling Zhao
- Web page: https://patentgrep.com/patent/US20130153102A1

## CPC

- B60C 1/0016: {Compositions of the tread}
- C08K 3/04: Carbon
- C08L 7/00: Compositions of natural rubber
- C08L 9/00: Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- B60C 2001/0058: {Compositions of the bead apexes}
- C08K 3/041: {Carbon nanotubes}
- C08K 3/042: {Graphene or derivatives, e.g. graphene oxides}
- C08K 3/346: {Clay}
- C08K 3/36: Silica
- Y10T 152/10495: Pneumatic tire or inner tube
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

The invention relates to a pneumatic tire with a component containing syndiotactic polybutadiene. The invention particularly relates to a tire with a tread configured with an outer cap rubber layer and an internal underlying rubber layer where the underlying rubber layer is comprised of such syndiotactic polybutadiene-containing rubber composition or a tire with a sidewall apex of such syndiotactic polybutadiene-containing rubber composition.

## Claims

### Claim 1

A pneumatic rubber tire having a circumferential tread of a cap/base configuration comprised of an outer tread cap rubber layer and an internal tread rubber layer where said internal tread rubber layer rubber composition is comprised of, based upon parts by weight per 100 parts by weight rubber (phr):
(A) rubber(s) comprised of:
(1) about 10 to about 80 phr of syndiotactic-1,2-polybutadiene, and
(2) about 90 to about 20 phr of at least one additional diene-based elastomer comprised of at least one of polymers and copolymers of at least one of isoprene and 1,3-butadiene and copolymers of styrene and at least one of isoprene and 1,3-butadiene, a pneumatic rubber tire is provided having a component comprised of a rubber composition comprised of, based on parts by weight per 100 parts by weight rubber (phr):
(B) elastomer(s) comprised of:
(1) about 10 to about 80 phr of syndiotactic-1,2-polybutadiene, and
(2) about 90 to about 20 phr of at least one additional diene-based elastomer comprised of at least one of polymers and copolymers of at least one of isoprene and 1,3-butadiene and copolymers of styrene and at least one of isoprene and 1,3-butadiene,
(C) up to about 40 phr of filler reinforcement comprised of:
(1) carbon black, or
(2) amorphous, synthetic silica (e.g. precipitated silica), or
(3) combination of carbon black and (said) precipitated silica, or
(4) platelets of exfoliated clay (e.g. exfoliated montmorillonite clay) in an amount of up to about 10 phr and clay (unexfoliated clay such as, for example, kaolinite clay) in an amount of up to about 40 phr;
wherein said filler reinforcement comprised of at least one said carbon black and precipitated silica may optionally additionally contain at least one of said platelets of exfoliated clay in an amount of up to about 10 phr and said clay (unexfoliated clay) in an amount of up to about 40 phr;
wherein said carbon black based filler is comprised of at least one of:
(5) rubber reinforcing carbon black (C1) having a DBP value in a range of from about 62 to about 150 cc/100 g and an Iodine value in a range of from about 20 to about 205 m2/g in an amount of from about 5 to about 40 phr,
(6) electrically conductive carbon black (C2) having a DBP value in a range of from about 175 to about 570 cc/100 g and an Iodine value in a range of from about 180 to about 650 m2/g in an amount of from about 5 to about 20 phr,
(7) graphene platelets (C3) comprised of at least partially exfoliated graphite in an amount of up to about 15 phr, and
(8) carbon nanotubes (C4) in an amount of up to about 10 phr.

### Claim 2 (depends on 1)

The tire of claim 1 wherein said filler reinforcement additionally contains at least one of exfoliated clay platelets in an amount of up to about 10 phr and clay in an amount of up to about 40 phr.

### Claim 3 (depends on 1)

The tire of claim 1 wherein said precipitated silica is present in an amount of up to 40 phr

### Claim 4 (depends on 1)

The tire of claim 1 wherein said carbon black based filler is primarily distributed in a preferential elastomer the rubber composition.

### Claim 5 (depends on 4)

The tire of claim 4 wherein said preferential elastomer constitutes greater than 50 percent of the elastomers of said rubber composition

### Claim 6 (depends on 4)

The tire of claim 4 wherein said preferential distribution is accomplished by mixing at least a primary portion of said carbon black filler with an individual elastomer prior to blending the remaining elastomer(s) with the rubber composition.

### Claim 7 (depends on 1)

The tire of claim 1 wherein said filler reinforcement is comprised of from about 5 to about 40 phr of a combination of said rubber reinforcing carbon black and said electrically conductive carbon black and, alternately said precipitated silica.

### Claim 8 (depends on 1)

The tire of claim 1 wherein said filler reinforcement is comprised of a combination of said rubber reinforcing carbon black and said graphene platelets and, alternately, said precipitated silica.

### Claim 9 (depends on 1)

The tire of claim 1 wherein said filler reinforcement is comprised of said rubber reinforcing carbon black and said carbon nanotubes and, alternately, said precipitated silica.

### Claim 10 (depends on 1)

The tire of claim 1 wherein said filler reinforcement is comprised of said electrically conductive carbon black and said graphene platelets and, alternately, said precipitated silica.

### Claim 11 (depends on 1)

The tire of claim 1 wherein said filler reinforcement is comprised of said electrically conductive carbon black and said carbon nanotubes and, alternately, said precipitated silica.

### Claim 12 (depends on 1)

The tire of claim 1 wherein said pneumatic rubber tire contains a circumferential rubber tread of a cap/base configuration comprised of an outer cap rubber layer containing a tread running surface and an underlying rubber layer (underlying said outer tread cap rubber layer) wherein said component is said underlying rubber layer.

### Claim 13 (depends on 1)

The tire of claim 1 wherein said pneumatic tire is comprised of a circumferential rubber tread, supporting carcass, two spaced apart beads and sidewalls connecting said beads to said tread, wherein said component is an apex extending from said bead(s) into said sidewall.

### Claim 14 (depends on 1)

The tire of claim 1 wherein the total of said carbon based filler reinforcement content is limited to a maximum of about 40 phr.

### Claim 15 (depends on 1)

The tire of claim 1 wherein said syndiotactic-1,2-polybutadiene has a melting point in a range of from about 80° C. to about 200° C.

### Claim 16 (depends on 1)

The tire of claim 1 wherein said syndiotactic-1,2-polybutadiene has at least 70 percent of its repeating units in a 1,2-configuration.