Pneumatic tire

Patent metadata

Field	Value
Publication number	US-2016159147-A1
Application number	US-201414564613-A
Country	US
Kind code	A1
Filing date	Dec 9, 2014
Priority date	Dec 9, 2014
Publication date	Jun 9, 2016
Grant date	—

Abstract

The present invention is directed to a pneumatic tire having a tread comprising a vulcanizable rubber composition comprising, based on 100 parts by weight of elastomer (phr),
(A) from about 50 to about 90 phr of a solution polymerized styrene-butadiene rubber having a glass transition temperature (Tg) ranging from −65° C. to −55° C. and functionalized with an alkoxysilane group and at least one functional group selected from the group consisting of primary amines and thiols; (B) from about 50 to about 10 phr of polybutadiene having a cis 1,4 content greater than 95 percent and a Tg ranging from −80 to −110° C.; (C) from 30 to 80 phr of a combination of a resin having a Tg of at least 30° C. and an oil, wherein the weight ratio of resin to oil is greater than 1.

First claim

1 . A pneumatic tire having a tread comprising a vulcanizable rubber composition comprising, based on 100 parts by weight of elastomer (phr),
(A) from about 50 to about 90 phr of a solution polymerized styrene-butadiene rubber having a glass transition temperature (Tg) ranging from −65° C. to −55° C. and functionalized with an alkoxysilane group and at least one functional group selected from the group consisting of primary amines and thiols; (B) from about 50 to about 10 phr of polybutadiene having a cis 1,4 content greater than 95 percent and a Tg ranging from −80 to −110° C.; (C) from 30 to 80 phr of a combination of a resin having a Tg of at least 30° C. and an oil, wherein the weight ratio of resin to oil is greater than 1.

2 . The pneumatic tire of claim 1 , wherein the combination of resin and oil is present in an amount ranging from 30 to 50 phr.

3 . The pneumatic tire of claim 1 , wherein the combination of resin and oil is present in an amount ranging from 50 to 80 phr.

4 . The pneumatic tire of claim 1 , wherein the amount of oil ranges from 5 to 25 phr, and the amount of resin ranges from 25 to 45 phr.

5 . The pneumatic tire of claim 1 , wherein the amount of oil ranges from 5 to 15 phr, and the amount of resin ranges from 45 to 70 phr.

6 . The pneumatic tire of claim 1 , wherein the weight ratio of resin to oil is greater than 3.

7 . The pneumatic tire of claim 1 , wherein the weight ratio of resin to oil is greater than 6.

8 . The pneumatic tire of claim 1 , wherein the resin is selected from the group consisting of hydrocarbon resins, phenol/acetylene resins, terpene-phenol resins, rosin derived resins and mixtures thereof.

9 . The pneumatic tire of claim 1 , wherein the resin is derived from styrene and alphamethylstyrene.

10 . The pneumatic tire of claim 1 , wherein the resin is a terpene-phenol resin.

11 . (canceled)

12 . The pneumatic tire of claim 1 , wherein the solution polymerized styrene-butadiene rubber is functionalized with an alkoxysilane group and a primary amine group comprises the reaction product of a living polymer chain and a terminating agent of the formula
RN—(CH 2 ) x —Si—(OR′) 3 ,  I
wherein R in combination with the nitrogen (N) atom is a protected amine group which upon appropriate post-treatment yields a primary amine, R′ represents a group having 1 to 18 carbon atoms selected from an alkyl, a cycloalkyl, an allyl, or an aryl; and X is an integer from 1 to 20.

13 . The pneumatic tire of claim 1 wherein the solution polymerized styrene-butadiene rubber is functionalized with an alkoxysilane group and a thiol, and comprises the reaction product of a living anionic polymer and a silane-sulfide modifier represented by the formula
(R 4 O) x R 4 y Si—R 5 —S—SiR 4 3

wherein Si is silicon; S is sulfur; 0 is oxygen; x is an integer selected from 1, 2 and 3; y is an integer selected from 0, 1, and 2; x+y=3; R 4 is the same or different and is (C 1 -C 16 ) alkyl; and R′ is aryl, and alkyl aryl, or (C 1 -C 16 ) alkyl.

14 . The pneumatic tire of claim 1 , wherein said vulcanizable rubber composition comprises about 70 to about 160 phr of silica.

Assignees

• Goodyear Tire & Rubber

Inventors

• Isitman Nihat Ali
• Jacoby Claude Charles
• Thielen Georges Marcel Victor

Classifications

• B60C1/0016 Primary

  Compositions of the tread · CPC title

• C08L25/02

  Homopolymers or copolymers of hydrocarbons · CPC title

• C08K5/548

  containing sulfur {(C08K5/5477 takes precedence)} · CPC title

• C08L9/00

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

• C08L15/00

  Compositions of rubber derivatives (C08L11/00, C08L13/00 take precedence) · CPC title