Pneumatic tire

Patent metadata

Field	Value
Publication number	US-11214667-B2
Application number	US-201916524284-A
Country	US
Kind code	B2
Filing date	Jul 29, 2019
Priority date	Jul 29, 2019
Publication date	Jan 4, 2022
Grant date	Jan 4, 2022

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 20 to about 100 phr of a solution polymerized styrene-butadiene rubber having a glass transition temperature (Tg) ranging from −85° C. to −50° C.;(B) from 0 to about 40 phr of a natural rubber or synthetic polyisoprene;(C) from 0 to about 30 phr of cis-1,4 polybutadiene having a Tg of from −110° C. to −90° C.;(D) from 0 to 50 phr of a process oil;(E) from 20 to 80 phr of a hydrocarbon resin having a Tg of at least 30° C.; and(F) from 90 to 150 phr of silica.

First claim

The invention 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 20 to about 100 phr of a solution polymerized styrene-butadiene rubber having a glass transition temperature (Tg) ranging from −85° C. to −50° C.;
(B) from 0 to about 40 phr of a natural rubber or synthetic polyisoprene;
(C) 0 to about 30 phr of cis-1,4 polybutadiene having a Tg of from −110° C. to −90° C.;
(D) from 0 to 50 phr of a process oil;
(E) from 55 to 80 phr of a hydrocarbon resin having a Tg of at least 30° C.; and
(F) from 90 to 150 phr of silica.

2. The pneumatic tire of claim 1 , wherein the hydrocarbon resin is selected from the group consisting of styrene/alphamethylstyrene copolymer resins, C5/C9 copolymer resins, dicyclopentadiene resins, and aromatic dicyclopentadiene resins.

3. The pneumatic tire of claim 1 , wherein the resin is an aromatic modified dicyclopentadiene resin.

4. The pneumatic tire of claim 1 , wherein the resin is a styrene/alphamethylstyrene copolymer resins.

5. The pneumatic tire of claim 1 , wherein the resin is a DCPD-based resin comprising from about 5 to about 90 mol % units derived from DCPD.

6. The pneumatic tire of claim 1 , wherein the resin is a DCPD-based resin comprising from 1 to 20 mol % aromatic hydrogen.

7. The pneumatic tire of claim 1 , wherein the resin is a C5/C9 resin comprising 50-90% (by weight) piperylenes, 0-5% isoprene, 10-30% amylenes, 2-5% cyclics, 4-10% styrenics, and 4-10% indenics.

8. The pneumatic tire of claim 1 , wherein the resin is a C5/C9 resin comprising an aromatic hydrogen content between 3 and 15 mole percent.

9. The pneumatic tire of claim 1 , wherein the solution polymerized styrene-butadiene rubber is functionalized with an alkoxysilane group and at least one functional group selected from the group consisting of primary amines and thiols.

10. The pneumatic tire of claim 1 , wherein the oil is selected from the group consisting of aromatic, paraffinic, naphthenic, IVIES, TDAE, heavy naphthenic oils, and vegetable oils.

11. The pneumatic tire of claim 1 , wherein the solution polymerized styrene-butadiene rubber functionalized with an alkoxysilane group and a primary amine group, and is represented by the formula (1) or (2)

wherein P is a (co)polymer chain of a conjugated diolefin or a conjugated diolefin and an aromatic vinyl compound, R 1 is an alkylene group having 1 to 12 carbon atoms, R 2 and R 3 are each independently an alkyl group having 1 to 20 carbon atoms, an allyl group or an aryl group, n is an integer of 1 or 2, m is an integer of 1 or 2, and k is an integer of 1 or 2, with the proviso that n+m+k is an integer of 3 or 4,

wherein P, R 1 , R 2 and R 3 have the same definitions as give for the above-mentioned formula (1), j is an integer of 1 to 3, and h is an integer of 1 to 3, with the provision that j+h is an integer of 2 to 4.

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; 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, and alkyl aryl, or (C 1 -C 16 ) alkyl.

14. The pneumatic tire of claim 1 , wherein the amount of the styrene-butadiene rubber ranges from 70 to 90 phr.

15. The pneumatic tire of claim 1 , wherein the amount of the natural rubber or synthetic polyisoprene ranges from 15 to 30 phr.

16. The pneumatic tire of claim 1 , wherein the amount of the polybutadiene ranges from 5 to 15 phr.

17. The pneumatic tire of claim 1 , wherein the amount of the oil ranges from 1 to 20 phr.

Assignees

• Goodyear Tire & Rubber

Inventors

• Steiner Pascal Patrick
• Delville Jérôme Joel Daniel
• Nzulu Frida
• Jacoby Claude Charles
• Piret Jean-Paul
• Djelloul-Mazouz Malik
• Pompei Manuela

Classifications

• C08L2205/035

  containing four or more polymers in a blend · CPC title

• C08L91/00

  Compositions of oils, fats or waxes; Compositions of derivatives thereof · CPC title

• C08L9/06 Primary

  Copolymers with styrene · CPC title

• B60C1/0016 Primary

  Compositions of the tread · CPC title

• C08K3/36

  Silica · CPC title