Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1998-03-05
2000-01-11
Seidleck, James J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525374, 5253328, 525259, 525296, 524492, 524555, C08F27904, C08L 3900, C08K 334
Patent
active
060137371
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a rubber composition comprising a diene rubber and silica as a reinforcer. More particularly, it relates to a diene rubber composition having excellent tensile properties and abrasion properties.
BACKGROUND ART
In recent years, there is a strictly increasing demand for reducing a fuel consumption in automobiles from a standpoint of saving resources and conserving the environment. As for automobile tires, the reduction of rolling resistance is desired for the reduction of a fuel consumption. The reduction of rolling resistance is generally achieved by using a rubber material capable of giving a vulcanized rubber exhibiting a reduced heat build-up.
Recently it has been proposed to use a rubber composition comprising silica as a reinforcer and a diene rubber having introduced therein a substituent having affinity to silica, for lowering the heat build-up. As examples of the substituent having an affinity with silica, which is introduced in a diene rubber, there can be mentioned a tertiary amino group (Japanese Unexamined Publication No. 1-101344 and ibid. 64-22940), an alkyl-silyl group (Japanese Unexamined Patent Publication No. 1-188501) and a halogenated silyl group (Japanese Unexamined Patent Publication No. 5-230286). However, the reduction of heat build-up by the rubber composition comprising silica and a diene rubber having introduced therein a substituent having an affinity with silica is not to a sufficient extent, and tensile properties such as tensile stress and abrasion resistance are poor.
DISCLOSURE OF INVENTION
The object of the present invention is to provide a rubber composition comprising a diene rubber, silica, a vulcanizer and a vulcanization accelerator which exhibits a reduced heat build-up reduced to a sufficient extent and thus, gives a tire having a rolling resistance, and which has good tensile strength and abrasion resistance.
The present inventors conducted extensive research to obviate the problems encountered in the heretofore-proposed techniques, and found that a rubber composition comprising an amino group-containing diene rubber, silica, a vulcanizer and a specific vulcanization accelerator which exhibits a reduced heat build-up to a sufficient extent without reduction of tensile strength and abrasion resistance. The amino group-containing diene rubber can be used alone or, if desired, in combination with other diene rubbers. The present invention has been completed based on these findings.
In accordance with the present invention, there is provided a rubber composition comprising 100 parts by weight of a diene rubber, 10 to 120 parts by weight of silica, 0.1 to 15 parts by weight of a vulcanizer and 0.1 to 15 parts by weight of a vulcanization accelerator, characterized in that the diene rubber is (A) an amino group-containing diene rubber having a Mooney viscosity (ML.sub.1+4, 100.degree. C.) of 20 to 250 or a mixture of said amino group-containing rubber (A) with other diene rubber (B), and further that the vulcanization accelerator is a sulfenamide compound.
BEST MODE FOR CARRYING OUT THE INVENTION
In the present invention, a specific diene rubber is used, which is (A) an amino group-containing diene rubber having a Mooney viscosity (ML.sub.1+4, 100.degree. C.) of 20 to 250, or a mixture of said amino group-containing diene rubber (A) with other diene rubber (B). The amino group-containing diene rubber (A) may be used alone or in combination of two or more. The other diene rubber also may used alone or in combination of two or more.
The amino group-containing diene rubber preferably has a Mooney viscosity (ML.sub.1+4, 100.degree. C.) of 30 to 150, more preferably 40 to 100. When the Mooney viscosity is in this range, the exothermic heat and the abrasion resistance are improved to a satisfactorily high level.
The amino group contained in the amino group-containing diene rubber may be any of a primary amino group, a secondary amino group and a tertiary amino group. However, to reduce the heat build-up and enhance the tensil
REFERENCES:
patent: 4866138 (1989-09-01), Chasar
patent: 4960819 (1990-10-01), Sandstrom et al.
patent: 5189109 (1993-02-01), Imai et al.
patent: 5247009 (1993-09-01), Kitahara
Nakamura Masao
Takagishi Yukio
Asinovsky Olga
Nippon Zeon Co. Ltd.
Seidleck James J.
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