Elastomer compositions based on filled latex

• US 20040192839A1
• Filed: 02/02/2004
• Published: 09/30/2004
• Est. Priority Date: 08/03/2001
• Status: Active Grant

• Current Assignee: Conception ET Developpement Michelin S.A.
• Original Assignee: Conception ET Developpement Michelin S.A.
• Inventors: Mousty, Herve, Tornare, Marcel
• Granted Patent: US 7,399,805 B2
• Time in Patent Office: Days
• US Class Current: 524/804
• CPC Class Codes: C08J 3/21 the polymer being premixed with a liquid phase
• CPC Class Codes: C08K 3/04 Carbon
• CPC Class Codes: C08K 3/36 Silica
• CPC Class Codes: C08L 21/02 Latex

Abstract

A process for the production of a vulcanized elastomer composition, said process consisting in producing an aqueous dispersion containing at least latex with a small particle size and a filler having undergone a mechanical working stage and conventional vulcanization ingredients, in drying said dispersion and then vulcanizing it in a mould under pressure without subjecting said dried aqueous dispersion to mechanical working.

Claims

1. A process for obtaining a vulcanized elastomer composition which comprises:

producing an aqueous dispersion comprising a latex having a small particle size, a filler having undergone a mechanical working stage, and conventional vulcanization ingredients,

drying said aqueous dispersion, and

vulcanizing directly in a mould at a pressure of greater than 15 bar.

2. The process according to claim 1, wherein the mechanical working undergone by the filler is performed by dry grinding of the filler.

3. The process according to claim 2, wherein the dry grinding of the filler is performed by means of balls.

4. The process according to claim 1, wherein the mechanical working undergone by the filler is performed by passing the filler dispersion at least once at high pressure into small diameter chambers of a homogenizer.

5. The process according to claim 1, wherein the mechanical working undergone by the filler is performed in the presence of the latex and surfactants.

6. The process according to claim 1, wherein the mechanical working undergone by the filler is performed by grinding the filler and a proportion of the latex together for a certain amount of time, then introducing an aqueous surfactant solution and mixing in order to obtain a dispersion of the filler.

7. The process according to claim 1, wherein the mechanical working undergone by the filler is performed by dispersing the filler in an aqueous surfactant solution, introducing a proportion of the latex, and then mixing for a certain time.

8. The process according to claim 1, further comprising shaping the composition, and wherein the drying and shaping are achieved by spraying of the aqueous dispersion in hot air.

9. The process according to claim 8, wherein the drying and shaping are achieved by spraying of the aqueous dispersion in hot air with direct deposition onto a form, so subsequently permitting the vulcanizating under pressure.

10. The process according to claim 1, wherein the vulcanizating is performed at a pressure of greater than 50 bar.

11. The process according to claim 8, wherein a gradual change-over from a mixture of one nature to a mixture of another nature is performed.

12. A final latex dispersion obtained by the process according to claim 1, wherein the final latex dispersion is a constituent material of a tire.

13. A final latex dispersion obtained by the process according to claim 1, wherein the final latex dispersion is a reinforced adhesive.

14. A final latex dispersion obtained by the process according to claim 1, wherein the final latex dispersion is an “

RFL”

adhesive for bonding rubber mixtures to textile reinforcements.

15. A final latex dispersion obtained by the process according to claim 1, wherein the final latex dispersion is applied to a metallic cord.

16. A final latex dispersion obtained by the process according to claim 1, wherein the final latex dispersion is applied as a thin layer between the various products of a tire during manufacture.

17. A final latex dispersion obtained by the process according to claim 1, wherein the final latex dispersion is an adhesive and is used during recapping between an old part and a new uncured part or between the old part and a new, precured part.

18. A final latex dispersion obtained by the process according to claim 1, wherein the final latex dispersion is used for direct production of a tread by spraying of an ad hoc composition onto a rotating tire carcass.