Diene rubber, process for producing the rubber and rubber compos

Details Diene rubber, process for producing the rubber and rubber compos Diene rubber, process for producing the rubber and rubber compos

1998-08-24

2000-11-14

Wu, David W.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526347, 526173, 502157, 524492, 5253329, 5253331, 5253333, 5253336, C08F23606, C08F23610

Patent

active

06147178&

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to a diene rubber having a quaternary ammonium group, which is characterized as, when silica is incorporated therein, exhibiting a reduced heat build-up and having improved tensile strength and abrasion resistance; a process for producing the diene rubber; and a diene rubber mixture containing the diene rubber. Further, it relates to a rubber composition comprising a rubber ingredient containing the quaternary ammonium group-having diene rubber, and a reinforcing agent.


BACKGROUND ART

In recent years, a serious view has been taken for saving resources and cleaning up the environment, and thus, the reduction of fuel consumption of automobiles is required severely. For the reduction of fuel consumption, reduction of rolling resistance of tires is desired. The reduction of rolling resistance of tires is attained usually by using a rubber material capable of providing a rubber vulcanizate exhibiting a reduced heat build-up.
Incorporation of silica as a reinforcing agent instead of carbon black, in a diene rubber, has heretofore been proposed to give a rubber composition capable of exhibiting a reduced heat build-up. However, the silica-incorporated diene rubber composition has a problem such that the tensile strength and abrasion resistance are poor as compared with the carbon black-incorporated diene rubber composition. This would be due to the fact that silica has poorer affinity than carbon black to a diene rubber, and thus, the silica does not exhibit highly enhanced reinforcing effect.
Proposals of using a diene rubber having introduced therein a substituent exhibiting an improved affinity to the diene rubber have heretofore been made to enhance the affinity of silica to the diene rubber. For example, a diene rubber having introduced therein a tertiary amino group, which is prepared by an emulsion polymerization procedure (Japanese Unexamined Patent Publication (abbreviated to "JP-A") H1-101344), and a diene rubber having introduced therein an alkylsilyl group (JP-A H1-188501), a halogenated silyl group (JP-A H5-230286) or an amino group having a substituent or substituents (JP-A S64-22940), which are prepared by an anion polymerization procedure, were proposed. However, the diene rubbers having incorporated therein these substituents exhibit heat build-up, tensile strength and abrasion resistance, which are not improved to the desired extent.
A rubber composition exhibiting an enhanced green strength was proposed in Japanese Examined Patent Publication (abbreviated to "JP-B") S58-41282 wherein a rubber composition is disclosed, which comprises a product prepared by reacting a butadiene-styrene copolymer having a tertiary amino group in the main chain with a dihalide such as 4,4'-bis(bromoacetyl)diphenylmethane (hereinafter abbreviated to "BADM"), and carbon black. If this product is incorporated with silica, the tensile strength is improved to a certain extent, but, the effect of reducing the heat build-up, intended by the incorporation of silica, is not sufficient and the abrasion resistance and other properties also are not high.


DISCLOSURE OF INVENTION

An object of the present invention is to provide a diene rubber and a process for preparing the diene rubber, which rubber is characterized as, when silica is incorporated therein as a reinforcing agent, exhibiting a well reduced heat build-up, which is an index of a well reduced rolling resistance, and having tensile strength and abrasion resistance, which are approximately equal to those of the diene rubber composition containing carbon black.
Another object is to provide a rubber composition exhibiting a well reduced heat build-up and excellent tensile strength and abrasion resistance.
To solve the above-mentioned problems of the heretofore proposed rubber compositions, the inventors conducted extensive researches and found that a rubber composition exhibiting a well reduced heat build-up and excellent tensile strength and abrasion resistance can be obtained by blending a rubber ingredient comprising a sp

REFERENCES:
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patent: 4222906 (1980-09-01), Briggs et al.
patent: 4894409 (1990-01-01), Shimada et al.
patent: 4927887 (1990-05-01), Tate et al.
patent: 4988773 (1991-01-01), Bronstert
patent: 5128416 (1992-07-01), Imai et al.
patent: 5219938 (1993-06-01), Imai et al.

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