Tire comprising a composition essentially free of guanidine derivative and comprising an alkali metal hydroxide or alkaline-earth metal hydroxide

Patent metadata

Field	Value
Publication number	US-9267014-B2
Application number	US-201214367528-A
Country	US
Kind code	B2
Filing date	Dec 17, 2012
Priority date	Dec 21, 2011
Publication date	Feb 23, 2016
Grant date	Feb 23, 2016

Abstract

A tire comprising a rubber composition based on at least one diene elastomer, a reinforcing filler predominantly comprising silica, a crosslinking system, and an alkali metal hydroxide or alkaline earth metal hydroxide. The rubber composition is essentially devoid of guanidine derivative.

First claim

The invention claimed is:

1. A tire comprising a rubber composition based on:
at least one diene elastomer,
a reinforcing filler predominantly composed of silica,
a crosslinking system, and
an alkali metal hydroxide or alkaline earth metal hydroxide,
wherein the rubber composition includes less than 0.5 phr of guanidine derivative.

2. The tire according to claim 1 , wherein the rubber composition includes less than 0.45 phr of guanidine derivative.

3. The tire according to claim 2 , wherein the rubber composition includes less than 0.4 phr of guanidine derivative.

4. The tire according to claim 3 , wherein the rubber composition is devoid of guanidine derivative.

5. The tire according to claim 1 , wherein the alkali metal hydroxide or alkaline earth metal hydroxide is present in the rubber composition at a content of from 0.05 to 3 phr.

6. The tire according to claim 5 , wherein the content of alkali metal hydroxide or alkaline earth metal hydroxide is from more than 0.1 phr to 2 phr.

7. The tire according to claim 1 , wherein the alkali metal hydroxide or alkaline earth metal hydroxide is selected from the group consisting of: sodium hydroxide, potassium hydroxide, lithium hydroxide, magnesium hydroxide, calcium hydroxide, barium hydroxide and mixtures thereof.

8. The tire according to claim 7 , wherein the alkali metal hydroxide or alkaline earth metal hydroxide is selected from the group consisting of: sodium hydroxide, potassium hydroxide, lithium hydroxide and mixtures thereof.

9. The tire according to claim 7 , wherein the alkali metal hydroxide or alkaline earth metal hydroxide is selected from the group consisting of: magnesium hydroxide, calcium hydroxide, barium hydroxide and mixtures thereof.

10. The tire according to claim 1 , wherein the silica is present in the rubber composition at a content of from 30 to 150 phr.

11. The tire according to claim 1 , wherein the reinforcing filler comprises a minor amount of carbon black.

12. The tire according to claim 11 , wherein the carbon black is present in the rubber composition at a content of from 0.5 to 50 phr.

13. The tire according to claim 1 , wherein the diene elastomer is selected from the group consisting of: polybutadienes, synthetic polyisoprenes, natural rubber, butadiene copolymers, isoprene copolymers and mixtures thereof.

14. The tire according to claim 1 , wherein the diene elastomer is predominantly composed of non-isoprene diene elastomer.

15. The tire according to claim 14 , wherein the diene elastomer is composed of 100 phr of non-isoprene diene elastomer.

16. The tire according to claim 14 , wherein the non-isoprene diene elastomer is selected from the group consisting of: polybutadienes, butadiene copolymers, isoprene copolymers, and mixtures thereof.

17. The tire according to claim 1 , wherein the rubber composition is additionally based on a plasticizer.

18. The tire according to claim 17 , wherein the plasticizer is selected from the group consisting of: plasticizing resins, extending oils, and mixtures thereof.

19. The tire according to claim 17 , wherein the plasticizer is present in the rubber composition at a content of from 5 to 100 phr.

20. The tire according to claim 1 , wherein the rubber composition comprises less than 0.5 phr zinc.

21. The tire according to claim 20 , wherein the rubber composition comprises less than 0.3 phr zinc.

22. The tire according to claim 21 , wherein the rubber composition is devoid of zinc.

23. The tire according to claim 1 , wherein the rubber composition is additionally based on a coupling agent.

24. The tire according to claim 23 , wherein the coupling agent is a hydroxysilane polysulphide corresponding to the general formula (III):
(HO) a R (3-a) Si—R′—S x —R′—SiR (3-b) (OH) b   (III),

wherein the R radicals, which are identical or different, are hydrocarbon groups;
wherein the R′ radicals, which are identical or different, are divalent connecting groups;
wherein a and b, which are identical or different, are equal to 1 or 2; and
wherein x is a number greater than or equal to 2.

25. The tire according to claim 24 , wherein the R radicals are hydrocarbon groups comprising from 1 to 15 carbon atoms.

26. The tire according to claim 24 , wherein the R′ radicals are divalent connecting groups comprising from 1 to 18 carbon atoms.

27. The tire according to claim 24 , wherein the coupling agent is a monohydroxysilane in which a and b are equal to 1.

28. The tire according to claim 24 ,
wherein the R radicals are selected from the group consisting of: C 1 -C 6 alkyls, C 5 -C 8 cycloalkyls, and a phenyl radical, and
wherein the R′ radicals are selected from the group consisting of: C 1 -C 18 alkylenes and C 6 -C 12 arylenes.

29. The tire according claim 24 , wherein the R radicals are selected from the group consisting of: C 1 -C 6 alkyls and the R′ radicals are selected from the group consisting of: C 1 -C 10 alkylenes.

30. The tire according to claim 24 , wherein the hydroxysilane is a monohydroxysilane polysulphide of formula (IV):

wherein the R radicals are C 1 -C 3 alkyls;
wherein the R′ radicals are C 1 -C 4 alkylenes; and
x is greater than or equal to 2.

31. The tire according to claim 30 , wherein the R radicals are each methyl.

32. The tire according to claim 30 , wherein the R′ radicals are selected from the group consisting of: methylene, ethylene, and propylene.

33. The tire according to claim 24 , wherein the hydroxysilane is a bis(propyldimethylsilanol) polysulphide of specific formula (IVa):

34. The tire according to claim 1 , wherein the rubber composition is a composition of a tire layer selected from the group consisting of: all or part of a tread, all or part of a tire belt, and combinations thereof.

35. The tire according to claim 34 , wherein the rubber composition comprises all or part of the tread.

Assignees

• Michelin & Cie
• Michelin Rech Tech

Inventors

• Darnaud Christelle
• Longchambon Karine

Classifications

• C08L9/00

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

• C08K3/013

  Fillers, pigments or reinforcing additives · CPC title

• C08K3/105

  Compounds containing metals of Groups 1 to 3 or of Groups 11 to 13 of the Periodic Table · CPC title

• C08L91/005

  Drying oils · CPC title

• C08L23/20

  having four to nine carbon atoms · CPC title