Tire with improved grip on wet ground

Patent metadata

Field	Value
Publication number	US-9416259-B2
Application number	US-201314416776-A
Country	US
Kind code	B2
Filing date	Jul 24, 2013
Priority date	Jul 25, 2012
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

A tire comprising at least a rubber composition based on at least a blend of natural rubber, NR, or synthetic polyisoprene, and a styrene-butadiene copolymer, SBR, the SBR having a content greater than or equal to 20 parts per hundred parts of elastomer, phr, a reinforcing filler comprising carbon black, characterized in that the composition comprises a plasticizing resin having a glass transition temperature, Tg, greater than or equal to 20° C. and that the SBR has a Tg greater than or equal to −65° C.

First claim

The invention claimed is:

1. A tire comprising at least a rubber composition based on at least:
a blend of natural rubber, NR, or synthetic polyisoprene, and
a styrene-butadiene copolymer, SBR, the SBR having a content greater than or equal to 20 parts per hundred parts of elastomer, phr,
a reinforcing filler comprising carbon black, and
a plasticizing resin having a glass transition temperature, Tg, greater than or equal to 20° C., wherein the SBR has a Tg greater than or equal to −65° C.

2. The tire according to claim 1 , wherein the SBR content ranges from 20 phr to 80 phr.

3. The tire according to claim 2 , wherein the SBR content ranges from 20 to 60 phr.

4. The tire according to claim 1 , wherein the composition is further based on a polybutadiene, BR.

5. The tire according to claim 1 , wherein the content of NR or synthetic polyisoprene ranges from 30 phr to 80 phr.

6. The tire according to claim 5 , wherein the content of NR or synthetic polyisoprene is greater than or equal to 40 phr.

7. The tire according to claim 6 , wherein the content of NR or synthetic polyisoprene is greater than or equal to 60 phr.

8. The tire according to claim 1 , wherein the SBR has a Tg greater than or equal to −50° C.

9. The tire according to claim 1 , wherein the carbon black has a CTAB specific surface area of between 75 and 200 m 2 /g.

10. The tire according to claim 9 , wherein the carbon black has a CTAB specific surface area of between 100 and 150 m 2 /g.

11. The tire according to claim 1 , wherein the plasticizing resin has a Tg greater than or equal to 30° C.

12. The tire according to claim 1 , wherein the content of plasticizing resin ranges from 1 to 20 phr.

13. The tire according to claim 12 , wherein the content of plasticizing resin is less than or equal to 10 phr.

14. The tire according to claim 1 , wherein the content of reinforcing filler ranges from 20 to 200 phr.

15. The tire according to claim 14 , wherein the content of reinforcing filler ranges from 40 to 70 phr.

16. The tire according to claim 1 , wherein the reinforcing filler comprises an inorganic filler.

17. The tire according to claim 16 , wherein the inorganic filler constitutes at least 10% by weight of the total reinforcing filler.

18. The tire according to claim 16 , wherein the inorganic filler constitutes at most 50% by weight of the total reinforcing filler.

19. The tire according to claim 16 , wherein the inorganic filler comprises silica.

20. The tire according to claim 19 , wherein the inorganic filler consists of silica.

21. The tire comprising a tread having a rubber composition according to claim 1 .

Assignees

• Michelin & Cie
• Michelin Rech Tech
• Michelin Rech Tech

Inventors

• Mathey Olivier
• Durel Olivier

Classifications

• B60C1/0016

  Compositions of the tread · CPC title

• C08L7/00 Primary

  Compositions of natural rubber · CPC title

• C08K5/0016

  Plasticisers · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title

• C08L9/06 Primary

  Copolymers with styrene · CPC title