Rubber composition and a tire

Patent metadata

Field	Value
Publication number	US-12006436-B2
Application number	US-202117475488-A
Country	US
Kind code	B2
Filing date	Sep 15, 2021
Priority date	Nov 13, 2020
Publication date	Jun 11, 2024
Grant date	Jun 11, 2024

Abstract

The present invention is directed to a sulfur vulcanizable rubber formulation comprising 10 phr to 100 phr of at least one partially saturated elastomer comprising repeat units, wherein at most 10% of all repeat units of the elastomer comprise a double bond; 0 phr to 90 phr of at least one diene based elastomer; 40 phr to 200 phr of at least one filler; and 5 phr to 70 phr of at least one hydrogenated plasticizer. This sulfur vulcanizable rubber formulation has been found to be useful in manufacturing tires.

First claim

What is claimed is:

1. A sulfur vulcanizable rubber composition comprising: at least one partially saturated elastomer comprising repeat units, wherein at most 15% of all repeat units of the elastomer comprise a double bond, wherein the partially saturated elastomer has a glass transition temperature which is within the range of −52° C. to −60° C.; wherein the rubber composition comprises from 80 phr to 95 phr of the partially saturated elastomer and from 2 phr to 8 phr of cis-1,4-polybutadiene rubber having a cis-microstructure content of at least 95%, and wherein the polybutadiene rubber has a glass transition temperature within a range of −90° C. to −115° C.; 40 phr to 200 phr of at least one filler; 5 phr to 70 phr of at least one hydrogenated plasticizer; and 3 phr to 20 phr of a polyoctenamer.

2. The sulfur vulcanizable rubber composition according to claim 1 , wherein from 4% to 8% of all repeat units in the partially saturated elastomer have a double bond.

3. The sulfur vulcanizable rubber composition according to claim 1 , wherein said filler comprises from 40 phr to 190 phr of silica.

4. The sulfur vulcanizable rubber composition according to claim 1 , wherein the partially saturated elastomer consists of isoprene repeat units.

5. The sulfur vulcanizable rubber composition according to claim 1 , wherein the partially saturated elastomer consists of butadiene repeat units.

6. The sulfur vulcanizable rubber composition according to claim 1 , wherein the partially saturated elastomer has:
a glass transition temperature within a range of −55° C. to −60° C.; and
a molecular weight within a range of 200,000 g/mol to 500,000 g/mol.

7. The sulfur vulcanizable rubber composition according to claim 1 , wherein the rubber composition further comprises an oil at a level of up to 25 phr; and wherein the ratio of the hydrogenated plasticizer to the oil is within a range of 4:1 to 1:2.

8. The sulfur vulcanizable rubber composition according to claim 1 , further comprising 0.3 phr to 3 phr of a vulcanization accelerator selected from one or more of dithiocarbamate accelerators and thiuram accelerators.

9. The sulfur vulcanizable rubber composition of claim 1 wherein the hydrogenated plasticizer is a fully hydrogenated cyclopentadiene resin.

10. The sulfur vulcanizable rubber composition of claim 1 wherein the hydrogenated plasticizer is a partially hydrogenated cyclopentadiene resin.

11. The sulfur vulcanizable rubber composition according to claim 1 , wherein the polyoctenamer has a glass transition temperature within a range of −50° C. to −80° C.

12. The sulfur vulcanizable rubber composition according to claim 11 wherein the polyoctenamer has a weight average molecular weight within a range of 80,000 to 100,000 g/mol as determined by GPC.

13. The sulfur vulcanizable rubber composition according to claim 11 wherein the polyoctenamer has a melting point within a range of 45° C. to 55° C. as measured by DSC in a second heating.

14. The sulfur vulcanizable rubber composition according to claim 11 wherein the polyoctenamer contains between 65% and 85% trans double bonds.

15. The sulfur vulcanizable rubber composition according to claim 1 , wherein the partially saturated elastomer is a solution-polymerized styrene butadiene rubber.

16. The sulfur vulcanizable rubber composition according to claim 15 wherein the solution-polymerized styrene butadiene rubber has a bound styrene content which is with the range of 5% to 40%.

17. The sulfur vulcanizable rubber composition according to claim 15 wherein the solution-polymerized styrene butadiene rubber has a molecular weight within a range of 200,000 g/mol to 500,000 g/mol.

18. The sulfur vulcanizable rubber composition according to claim 15 wherein the solution-polymerized styrene butadiene rubber contains less than 5% non-hydrogenated vinyl groups, based on the total number of vinyl groups of the solution-polymerized styrene butadiene rubber.

19. A tire comprising the sulfur vulcanizable rubber composition of claim 1 .

Assignees

• Goodyear Tire & Rubber

Inventors

• Engeldinger Eric
• Pompei Manuela

Classifications

• C08L15/00 Primary

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

• C08K5/40

  Thiurams, {i.e. compounds containing[IMAGE cpc-sch-C08K-1011.gif] groups} · CPC title

• C08K5/0025

  Crosslinking or vulcanising agents; including accelerators · CPC title

• C08K5/0016

  Plasticisers · CPC title

• C08K3/36

  Silica · CPC title