Rubber compound for tyre production

Patent metadata

Field	Value
Publication number	US-9845384-B2
Application number	US-201415030414-A
Country	US
Kind code	B2
Filing date	Dec 19, 2014
Priority date	Dec 20, 2013
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

A rubber compound for tyres comprising a cross-linkable unsaturated chain polymer base comprising, in turn, at least a rubber of synthetic origin, a silica-free filler at least partially comprising carbon black, a vulcanization system and a mercapto carboxylic acid.

First claim

The invention claimed is:

1. A rubber compound for tyres comprising a cross-linkable unsaturated chain polymer base comprising at least a rubber of synthetic origin, a silica-free filler at least partially comprising carbon black, and a vulcanization system; said compound being characterized in that it comprises a mercapto carboxylic acid, wherein said mercapto carboxylic acid has the —CO 2 H and —SH functional groups spaced apart by a chain consisting of 4 to 40 atom, said rubber compound being prepared by a method comprising a pre-treatment step wherein said rubber of synthetic origin and said carbon black are mixed in the presence of a mercapto carboxylic acids.

2. A rubber compound according to claim 1 , characterized in that said mercapto carboxylic acid has the following formula (I)

wherein n ranges from 1 to 37.

3. A rubber compound according to claim 1 , characterized in that said mercapto carboxylic acid is

4. A rubber compound according to claim 1 , characterized in that said mercapto carboxylic acid is used in the compound in a quantity ranging from 0.05 to 10 phr.

5. A rubber compound according to claim 1 , characterized in that said filler consists exclusively of carbon black.

6. A rubber compound according to claim 1 , characterized in that the carbon black is of the type indicated by codes N1 or N3 according to the ASTM D1765 Standard.

7. A rubber compound according to claim 1 , characterized in that it is without stearic acid and ZnO.

8. A rubber compound according to claim 1 comprising carbon black N330, N-1,3-dimethyl-butyl-N′-phenyl-paraphenylenediamine, poly(1,2-dihydro-2,2,4-trimethyl quinoline, N-tert-butyl-2-benzothiazole sulfenamide and wherein said rubber of synthetic origin is styrene-butadiene rubber in solution with a mean molecular weight between 500 and 1500×10 3 ; a styrene content of between 10 and 45%, a vinyl content of between 20 and 70% and an oil content of between 0 and 30% and wherein said mercapto carboxylic acid is:

9. A tyre portion characterized in that it is manufactured with a compound according to claim 1 .

10. A tyre characterized in that it comprises a tyre portion according to claim 8 .

11. A method for the production of rubber compounds for the preparation of a tyre portion; said rubber compound comprising a cross-linkable unsaturated chain polymer base at least partially comprising a rubber of synthetic origin, a silica-free filler at least partially comprising carbon black, and a vulcanization system; said method being characterized in that it comprises a pretreatment step wherein said rubber of synthetic origin and said carbon black are mixed in the presence of a mercapto carboxylic acid.

12. A method for the production of rubber compounds according to claim 11 , characterized in that in said pretreatment step, the rubber of synthetic origin is mixed exclusively with the carbon black and the mercapto carboxylic acid.

Assignees

• Cossu Giancarlo
• Forte Gianluca
• Bridgestone Corp

Inventors

• Cossu Giancarlo
• Forte Gianluca

Classifications

• C08K5/37 Primary

  Thiols · CPC title

• C08K5/47

  Thiazoles · CPC title

• B60C1/00

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

• C08K5/3437

  condensed with carbocyclic rings · CPC title

• C08K2201/019

  the composition being defined by the absence of a certain additive · CPC title