Tire with tread intended for both on and off-the-road service

Patent metadata

Field	Value
Publication number	US-2016200899-A1
Application number	US-201514595425-A
Country	US
Kind code	A1
Filing date	Jan 13, 2015
Priority date	Jan 13, 2015
Publication date	Jul 14, 2016
Grant date	—

Abstract

This invention relates to heavy duty pneumatic rubber tires with treads intended for mixed service use on diverse surfaces and to rubber compositions for such tire tread.

First claim

1 . (canceled)

2 . (canceled)

3 . (canceled)

4 . (canceled)

5 . (canceled)

6 . (canceled)

7 . (canceled)

8 . (canceled)

9 . (canceled)

10 . (canceled)

11 . A pneumatic tire having a circumferential rubber tread of a rubber composition comprised of, based on parts by weight per 100 parts by weight of elastomer (phr),
(A) conjugated diene-based elastomers comprised of
(1) about 55 to about 80 phr of cis 1,4-polyisoprene natural rubber, and
(2) about 20 to about 45 phr of additional conjugated diene-based elastomers comprised of a combination of cis 1,4-polybutadiene rubber and organic solution polymerization prepared functionalized styrene/butadiene rubber (S-SBR) having a bound styrene content in a range of from about 12 to about 20 percent;
(B) about 40 to about 120 phr of rubber reinforcing filler comprised of a combination of rubber reinforcing carbon black and aggregates of precipitated silica, wherein said reinforcing filler is comprised of from about 2 to about 50 phr of rubber reinforcing carbon black, and from about 38 to about 118 phr of precipitated silica together with silica coupling agent for said precipitated silica comprised of a bis(3-triethoxysilylpropyl) polysulfide having an average of from about 2 to about 3.8 connecting sulfur atoms in its polysulfidic bridge; wherein the precipitated silica is comprised of a bimodal aggregate size configured precipitated silica with a monomodal pore size distribution in a range thereof of from about 38 to about 118 phr; wherein the bimodal aggregate sized precipitated silica is comprised of about 60 to about 80 weight percent of an average aggregate size configuration in a range of from about 0.05 to about 0.11 microns and about 20 to about 40 weight percent of an average size configuration in a range of from about 0.12 to about 1 micron; wherein said functionalized styrene/butadiene rubber contains functional groups reactive with hydroxyl groups on said bimodal aggregate size configured precipitated silica comprised of siloxy and at least one of amine and thiol groups.

12 . (canceled)

13 . (canceled)

14 . The pneumatic tire of claim 11 wherein said additional conjugated diene based elastomer is comprised of a combination of said cis 1,4-polybutadiene rubber and said functionalized styrene/butadiene rubber having a Tg in a range of about −68° C. to about −72° C.

15 . The pneumatic tire of claim 11 wherein the bimodal aggregate size configured precipitated silica aggregates have a nitrogen surface area of greater than 190 m 2 /g and a pH in a range of from about 3 to about 5.6.

16 . The pneumatic tire of claim 14 wherein said precipitated silica also contains from about 2 to about 20 weight percent of monomodal aggregate size configured precipitated silica.

17 . The pneumatic tire of claim 11 wherein said functionalized styrene/butadiene rubber is a tin coupled functionalized elastomer.

18 . (canceled)

19 . The pneumatic tire of claim 17 wherein said tin coupled functionalized styrene/butadiene rubber which contains functional groups reactive with hydroxyl groups contained on said bimodal aggregate sized precipitated silica comprised of siloxy, amine and thiol groups.

20 . The pneumatic tire of claim 11 wherein said cis 1,4-polybutadiene rubber is comprised of:
(A) a first cis 1,4-polybutadiene rubber having a microstructure comprised of from about 90 to about 99 percent cis 1,4-isomeric units, a number average molecular weight (Mn) in a range of from about 120,000 to about 300,000 and a heterogeneity index (Mw/Mn) in a range of from about 2.1/1 to about 4.5/1, or
(B) a second cis 1,4-polybutadiene rubber having a microstructure comprised of from about 93 to about 99 percent cis 1,4-isomeric units, a number average molecular weight (Mn) in a range of from about 150,000 to about 300,000 and a heterogeneity index (Mw/Mn) in a range of from about 1.5/1 to about 2/1.

21 . The pneumatic tire of claim 20 wherein said cis 1,4-polybutadiene rubber is said first cis 1,4-polybutadiene rubber.

22 . The pneumatic tire of claim 20 wherein said cis 1,4-polybutadiene rubber is said second cis 1,4-polybutadiene rubber.

Assignees

• Goodyear Tire & Rubber

Inventors

• Forciniti Leandro
• Meza Roberto Cerrato
• Busch Warren James

Classifications

• B60C1/0016

  Compositions of the tread · CPC title

• C08L7/00 Primary

  Compositions of natural rubber · CPC title

• C08L2205/03

  containing three or more polymers in a blend · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• C08L9/00

  Compositions of homopolymers or copolymers of conjugated diene hydrocarbons · CPC title