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Coupling agent for elastomeric composition comprising a reinforcing filler

a technology of elastomeric composition and reinforcing filler, which is applied in the manufacture of tires and tire treads, etc., can solve the problems of affecting the reinforcing affecting the rheological properties of the final product, and the annoying tendency of silica particles to form agglomerations, etc., to achieve the optimum properties of the tire tread, reduce the cost, and improve the effect of reinforcing properties

Inactive Publication Date: 2009-11-12
ARKEMA FRANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention aims to find new coupling agents that are cheaper than Si- 69 and can improve the properties of tire treads. These agents should also have good rheological properties for processing and treating vulcanizable compositions, especially in terms of viscosity. The patent text contains percentage values for the weights of the components.

Problems solved by technology

However, such conditions cannot be met except if the filler has a very high capability, on the one hand, of being incorporated into the matrix during mixing with the elastomer and, on the other hand, of being uniformly dispersed within said matrix.
As is known, carbon black has such a capability, but this is not the case in general for silica particles.
This is because, for reciprocal affinity reasons, silica particles have an annoying tendency to form agglomerations in the elastomer matrix.
This has a deleterious effect on the reinforcing properties of the final product obtained after vulcanization.
It is also problematic insofar as, by increasing the viscosity of the elastomer, silica, after it has been incorporated, makes the vulcanizable elastomeric composition difficult to work or to compound, especially when the non-sulfur-containing additives and the vulcanization system are being incorporated by mixing, or when the compound containing all the ingredients is being introduced into a vulcanization mold.
This coupling agent, which is widely used in industry, does however have the drawback of being extremely expensive.
However, the latter compounds also cause excessive costs because of the chemistry used.

Method used

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  • Coupling agent for elastomeric composition comprising a reinforcing filler
  • Coupling agent for elastomeric composition comprising a reinforcing filler
  • Coupling agent for elastomeric composition comprising a reinforcing filler

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0068]Composition based on poly(styrene / butadiene) (or SBR) and polybutadiene, reinforced by silica and containing 4 parts by weight of product (I) and 2 parts by weight of product (II).

[0069]A—Preparation of the Composition:

[0070]Introduced into a 2-liter internal mixer of the Banbury type, in the following order, were: SBR, polybutadiene, three-quarters of the silica, the product (I) and the product (II) constituting the coupling agent, the rest of the silica and then the non-sulfur-containing additives.

[0071]These were all mixed until the temperature reached 145° C., i.e. for about 5 minutes. Mixing was continued at this temperature for 4 minutes.

[0072]The composition thus obtained was transferred to an external mixer of the two-roll mill type, each roll of which had a diameter of 300 mm and a length of 700 mm. The vulcanization system, comprising sulfur and the two vulcanization accelerators, was then added to the composition at a temperature below 100° C. The mixing was continu...

example 2

[0086]Example 1 was repeated, with the contents of products (I) and (II) modified as indicated in Table I.

[0087]The properties given in Table II were obtained.

Control (Comparative) Example

[0088]Example 1 was repeated, but using as coupling agent only the product (II) with a content of 6.4 parts by weight (per 100 parts by weight of elastomers). This content corresponds to that of polysulfidic organosilane in patent EP 0 501 227 and to the amount of Si-69® usually introduced in the tire industry.

[0089]The measured properties are also given in Table II.

[0090]The examples according to the invention show a slightly higher consistometric index (Mooney viscosity) than that of the control example. However, it is still perfectly acceptable for producing sulfur-vulcanizable elastomeric compositions that are suitable for processing, especially as regards the operations of pouring them into a mold prior to the vulcanization forming operation.

[0091]Likewise, the reinforcement index of Examples ...

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Abstract

A method of forming a sulfur-vulcanized elastomeric by combining at least one diene elastomer and at least one reinforcing filler, with an effective amount of a coupling agent consisting of a combination of:10 to 90%, of a product (I) consisting of a blend of poly(alkylphenol) polysulfides of formula:in which:R is an alkyl radical containing 1 to 20 carbon atoms;n and n′ are two integers, which may be identical or different, from 1 to 8;p is an integer from 0 to 50; and10 to 90% of a product (II) consisting of bis(triethoxysilylpropyl)tetrasulfide, to form a mixture; thereafterworking said mixture; and thereafterheating said mixture to vulcanize said mixture. 90% of bis(triethoxysilylpropyl)tetrasulfide.

Description

[0001]This application is a continuation of U.S. patent application Ser. No. 10 / 560,880 filed Dec. 13, 2005FIELD OF THE INVENTION[0002]The present invention relates to the field of rubber compositions intended in particular for the manufacture of tires, and more especially for the manufacture of tire treads for motor vehicles. The subject of the invention is more particularly a sulfur-vulcanizable elastomeric composition containing a reinforcing filler and a specific coupling agent.BACKGROUND OF THE INVENTION[0003]Extensive research has been carried out on improving the properties required for tire covers. In connection with the permanent objective of reducing the fuel consumption of motor vehicles, efforts are thus made to improve the rolling resistance of said covers, while still maintaining excellent grip both to dry surfaces and to wet surfaces, as well as suitable wear resistance.[0004]Elastomeric compositions intended to form these treads are already known. They generally comp...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08K3/22C08L9/00C08L9/06B60C1/00C08K5/375
CPCB60C1/0016C08K5/375C08L9/06C08K5/548C08K3/36C08J3/20
Inventor AUBERT, THIERRY
Owner ARKEMA FRANCE SA