# US 2013/0153099 A1 · Tire tread base containing syndiotactic-1,2-polybutadiene with diverse carbon blacks

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- Number: US 2013/0153099 A1
- Document ID: US20130153099A1
- Status: Published application
- Kind: A1
- Application number: 13/331,515
- Filed: 2011-12-20
- Published: 2013-06-20
- Earliest claimed: 2011-12-20
- Assignees: The Goodyear Tire & Rubber Company
- Inventors: Claude Schweitzer; Junling Zhao; Marc Weydert
- Web page: https://patentgrep.com/patent/US20130153099A1

## CPC

- C08L 9/00: Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- B60C 1/0016: {Compositions of the tread}
- C08J 3/226: {using a polymer as a carrier}
- C08K 3/04: Carbon
- C08J 2307/00: Characterised by the use of natural rubber
- C08J 2407/00: Characterised by the use of natural rubber
- C08J 2409/00: Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- B60C: VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

The invention relates to a pneumatic tire having a cap/base configuration comprised of an outer tread cap rubber layer, with a tread running surface, and an underlying tread base rubber layer, where the base rubber layer contains syndiotactic polybutadiene with a diverse blend of carbon blacks.

## 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 underlying said outer tread cap rubber layer, wherein 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 2 to about 100 phr of syndiotactic-1,2-polybutadiene, and
(2) from zero to about 98 phr of at least one additional 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,
(B) from about 20 to about 70 phr of rubber reinforcing carbon blacks comprised of:
(1) about 10 to about 40 phr of a first rubber reinforcing carbon black having an Iodine absorption value (ASTM D2515) in a range of from about 6 to about 50 g/kg and a dibutylthalate (DBP) absorption value (ASTM D2414) in a range of from about 30 to about 200 cc/100 g,
(2) about 10 to about 40 phr of a second rubber reinforcing carbon black having an Iodine absorption value (ASTM D2515) in a range of from about 100 to about 1000 g/kg (ASTM D2515) and a dibutylthalate (DBP) absorption value (ASTM D2414) in a range of from about 95 to about 135 cc/100 g.

### Claim 2 (depends on 1)

The tire of claim 1 where the weight ratio of said first carbon black to said second carbon black is in a range of from 1.1/1 to about 4/1.

### Claim 3 (depends on 1)

The tire of claim 1 where the weight ratio of said first carbon black to said second carbon black is in a range of from 1.8/1 to about 4/1.

### Claim 4 (depends on 1)

The tire claim 1 where said rubbers are comprised of:
(A) about 2 to about 60 phr of syndiotactic-1,2-polybutadiene, and
(B) about 40 to about 98 phr of at least one of said additional elastomers.

### Claim 5 (depends on 1)

The tire of claim 1 where said rubbers are comprised of:
(A) about 2 to about 8 phr of syndiotactic-1,2-polybutadiene, and
(B) about 92 to about 98 phr of at least one of said additional elastomers.

### Claim 6 (depends on 5)

The tire of claim 5 wherein said syndiotactic-1,2-polybudiene is provided as a pre-formed masterbatch of polybutadiene rubber containing from about 8 to about 20 weight percent of said syndiotactic-1,2-polybutadiene.

### Claim 7 (depends on 1)

The tire of claim 1 wherein said syndiotactic-1,2-polybudiene has a melting point in a range of from about 80° C. to about 230° C.

### Claim 8 (depends on 1)

The tire of claim 1 wherein said syndiotactic-1,2-polybudiene has a melting point in a range of from about 100° C. to about 170° C.

### Claim 9 (depends on 1)

The tire of claim 1 wherein said additional elastomer(s) are at least one of cis 1,4-polyisoprene, polybutadiene, styrene/butadiene and styrene/isoprene/butadiene elastomers.

### Claim 10 (depends on 1)

The tire of claim 1 wherein said first rubber reinforcing carbon black has an Iodine absorption value in a range of from about 20 to about 50 g/kg and a dibutylthalate (DBP) absorption value in a range of from about 60 to about 150 cc/100 g.

### Claim 11 (depends on 1)

The tire of claim 1 wherein said second rubber reinforcing carbon black has an Iodine absorption value in a range of from about 100 to about 300 g/kg and a dibutylthalate (DBP) absorption value in a range of from about 95 to about 135 cc/100 g.