Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1997-01-15
1998-09-08
Teskin, Fred
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524492, 524493, 5253326, 5253327, 5253328, 5253329, 525 331, 5253332, 525338, 523213, 152209R, 152450, C08K 336, C08L 900
Patent
active
058046445
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a rubber composition comprising a rubber which is partially reacted with hydrogen (hereinafter "a reaction with hydrogen" is referred to "hydrogenation") and which has extremely excellent resilience and low exothermic property, excellent wet skid resistance, and further improved processability.
More specifically, the present invention relates to a rubber composition comprising a raw material rubber which contains a partially hydrogenated rubber of a conjugated diene rubber, a silica, an organo-silane coupling agent, and a vulcanizing agent, and if necessary, a carbon black. Especially when the composition of the present invention is employed to prepare a tire, it exhibits the effect of saving of fuel cost.
BACKGROUND ART
Recently, with the progress of the automobile industry, more advances than before in various sorts of functions such as safety, handling stability, economical efficiency, comfort for the occupant in an automobile, no environmental pollution, etc. are demanded of tires with which the automobile is equipped. Especially with the increased number of automobiles, consumption of petroleum type fuel is increased, and accordingly atmospheric pollution such as carbon dioxide, nitrogen oxide, etc. contained in exhaust gas causes environmental pollution which is a social problem. Therefore, a reduction in petroleum-type fuel consumption by an improvement in fuel efficiency of an automobile and the conversion to use of electric cars which do not produce exhaust gas are demanded. Thus, a rubber material which has low rolling resistance and therefore reduces fuel consumption has been demanded of automobile tires.
The rolling resistance of a tire is mainly influenced by the hysteresis loss of a tread on rolling of the tire, and the rolling resistance is improved by using a composition exhibiting a low hysteresis loss. Further, as a function of a tire, safety such as handling stability, braking performance (a property of wet skid resistance) on a wet road surface and durability such as wear resistance are important. However, although both the rolling property and the wet skid resistance of a tire are functions which relate to the hysteresis loss of a tread rubber, these functions are in contradiction to each other, and therefore it has been heretofore thought to be difficult to simultaneously improve both of them.
As the vibratory frequency corresponding to rolling of a tire is different from that corresponding to the wet skid thereof, by noting the fact, many trials to improve the balance between these two types of functions have been heretofore proposed.
Many of these improvement relate to a method for improving the balance between the rolling property and the wet skid resistance of a tire by optimizing a raw material rubber used to formulate a rubber for vulcanization for a tire-tread including a carbon black as the reinforcing agent.
Recently, a rubber composition has been proposed wherein a polymer in which the double bonds of the butadiene portion of a styrene-butadiene rubber (hereinafter abbreviated as "SBR") are partially hydrogenated is employed Publication Examined No. 5('93)-74353)!. However, this technique relates to a composition in which a conventional carbon black is formulated as a reinforcing agent thereof, and shows insufficient effect, especially in resilience and a low exothermic property.
On the other hand, apart from these techniques, a method has been proposed wherein a silica is employed instead of a conventional carbon black as a reinforcing agent which is used in the formulating materials for a tire-tread, and thus the rolling property thereof is improved.
However, in contrast to a carbon black, a silica has a low affinity with a raw material rubber and thus has an extremely low dispersibility in a rubber. Therefore, in order that the performance as the rubber composition can be exhibited, it is important to disperse the silica well in the rubber. For that purpose, employing a silane type coupling agent, modifying a rubber, an
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Nakafutami Yasunobu
Saito Akira
Sugiyama Tsuyoshi
Asahi Kasei Kabushiki Kaisha
Teskin Fred
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