Pneumatic tire

Patent metadata

Field	Value
Publication number	US-10279626-B2
Application number	US-201715672345-A
Country	US
Kind code	B2
Filing date	Aug 9, 2017
Priority date	Dec 9, 2014
Publication date	May 7, 2019
Grant date	May 7, 2019

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

What is claimed is:

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; wherein the solution polymerized styrene-butadiene rubber 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; O 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 5 is aryl, alkyl aryl, or (C 1 -C 16 ) alkyl;
(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; and
(D) from about 70 to about 160 phr of silica.

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. The pneumatic tire of claim 1 , wherein the Tg of the solution polymerized styrene-butadiene rubber ranges from −65to −60° C.

Assignees

• Goodyear Tire & Rubber

Inventors

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

Classifications

• B60C1/00

  Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition · 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