Reinforced product comprising a composition containing a rapid vulcanization accelerator and tire comprising said reinforced product

Patent metadata

Field	Value
Publication number	US-10737532-B2
Application number	US-201515518589-A
Country	US
Kind code	B2
Filing date	Oct 9, 2015
Priority date	Oct 13, 2014
Publication date	Aug 11, 2020
Grant date	Aug 11, 2020

Abstract

A reinforced product, which can be used especially for reinforcing a finished rubber article, comprises one or more textile or metallic reinforcing thread(s), said thread(s) being covered with a sheath comprising a thermoplastic polymer composition, the sheathed thread(s) being themselves embedded in a rubber composition referred to as coating rubber, characterized in that this coating rubber is a composition based on at least one diene elastomer, a reinforcing filler, and a sulfur-based vulcanization system, which system comprises a vulcanization accelerator having a vulcanization initiation time, referred to as “t0”, of less than 3.5 minutes, preferably of less than or equal to 3 minutes.

First claim

The invention claimed is:

1. A reinforced product comprising one or more textile or metallic reinforcing threads, said one or more textile or metallic reinforcing threads being covered with a sheath comprising a thermoplastic polymer composition, the sheathed one or more textile or metallic reinforcing threads being themselves embedded in a coating rubber composition,
wherein the coating rubber composition is based on at least one diene elastomer, a reinforcing filler, and a sulfur-based vulcanization system, said system comprising a vulcanization accelerator having a vulcanization initiation time t 0 of less than 3.5 minutes,
wherein a sulfur content of the sulfur-based vulcanization system is within a range extending from 0.5 to 3 phr, and
wherein a ratio between the sulfur content of the sulfur-based vulcanization system and the vulcanization accelerator content is within a range extending from 0.1 to 4.

2. The reinforced product according to claim 1 , wherein the vulcanization accelerator has a vulcanization initiation time t 0 of less than or equal to 3 minutes.

3. The reinforced product according to claim 1 , wherein the vulcanization accelerator comprises compounds of thiuram family, thiocarbamate derivatives, sulphenamides, thiophosphates, or mixtures thereof.

4. The reinforced product according to claim 3 , wherein the vulcanization accelerator comprises N-cyclohexyl-2-benzothiazolesulphenamide.

5. The reinforced product according to claim 1 , wherein the coating rubber composition has a ratio of the amounts, in phr (parts by weight per hundred parts by weight of elastomer), of sulfur of the sulfur-based vulcanization system and of reinforcing filler, of less than 0.08.

6. The reinforced product according to claim 1 , wherein the coating rubber composition comprises a metal oxide and a stearic acid derivative in addition to the vulcanization accelerator in amounts such that a ratio of the content of metal oxide and of stearic acid derivative, in phr, is less than 7.

7. The reinforced product according to claim 1 , wherein the coating rubber composition comprises zinc oxide and stearic acid in addition to the vulcanization accelerator in amounts such that a ratio of the content of zinc oxide and of stearic acid, in phr, is less than 7.

8. The reinforced product according to claim 7 , wherein the ratio of the content of zinc oxide and of stearic acid, in phr, is between 1 and 3.

9. The reinforced product according to claim 1 , wherein the coating rubber composition comprises a metal oxide in addition to the vulcanization accelerator at a content of less than 7 phr and a stearic acid derivative at a content of greater than 1 phr.

10. The reinforced product according to claim 1 , wherein the coating rubber composition comprises a metal oxide in addition to the vulcanization accelerator at a content within a range extending from 1 to 7 phr.

11. The reinforced product according to claim 1 , wherein the coating rubber composition comprises a stearic acid derivative in addition to the vulcanization accelerator at a content within a range extending from 1 to 3 phr.

12. The reinforced product according to claim 1 , wherein the coating rubber composition does not comprise vulcanization retarder.

13. The reinforced product according to claim 1 , wherein the coating rubber composition does not comprise cobalt salt.

14. The reinforced product according to claim 1 , wherein the coating rubber composition does not comprise an adhesion promoter.

15. The reinforced product according to claim 1 , wherein the at least one diene elastomer predominantly comprises an elastomer selected from the group consisting of natural rubber, synthetic polyisoprene and a mixture thereof.

16. The reinforced product according to claim 1 , wherein the coating rubber composition comprises from 20 to 80 phr of reinforcing filler.

17. The reinforced product according to claim 1 , wherein the coating rubber comprises carbon black as the predominant reinforcing filler.

18. The reinforced product according to claim 1 , wherein the one or more textile or metallic reinforcing threads are one or more metallic reinforcing threads.

19. The reinforced product according to claim 1 , wherein the sheathed one or more textile or metallic reinforcing threads are coated with an adhesive.

20. The reinforced product according to claim 19 , wherein the adhesive is a resorcinol-formaldehyde-latex adhesive.

21. A tire comprising the reinforced product according to claim 1 .

22. The tire according to claim 21 , wherein the reinforced product is present in the tire at least in one ply selected from crown reinforcing plies and carcass plies.

Assignees

• Michelin & Cie
• Michelin Rech Tech

Inventors

• Thuilliez Anne-Lise

Classifications

• B60C9/20

  built-up from rubberised plies each having all cords arranged substantially parallel · CPC title

• B60C1/0041 Primary

  Compositions of the carcass layers · CPC title

• B60C1/00

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

• C08K5/0025 Primary

  Crosslinking or vulcanising agents; including accelerators · CPC title

• B60C2001/0066

  Compositions of the belt layers · CPC title