Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1998-10-15
2000-06-13
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C08L 2510
Patent
active
060750928
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to rubber compositions, and more particularly to rubber compositions having excellent heat build-up resistance, tensile strength and processability. The rubber compositions according to the present invention have low heat build-up and are thus suitable for use as rubber materials for automobile tires low in rolling resistance. The present invention also relates to novel polyether-based polymers useful as raw materials for the rubber compositions having such excellent various properties.
BACKGROUND ART
As much importance has been attached to saving in resources and countermeasures to environment in recent years, requirements to reduce fuel consumption of automobiles have been increasingly severe. Automobile tires have also been required to low their rolling resistance so as to contribute to reduction in the fuel consumption. In order to low the rolling resistance of tires, it is generally effective to use a rubber material capable of providing a vulcanized rubber having low heat build-up as a rubber material for the tires.
In general, rubber compositions in which carbon black is compounded into a diene rubber such as natural rubber (NR), polybutadiene (BR), polyisoprene (IR) or styrene-butadiene copolymer rubber (SBR) are widely used as rubber materials for tires. However, the rubber compositions obtained by compounding carbon black into the diene rubber have insufficient heat build-up resistance.
It has heretofore been proposed to use, as a rubber material for tires, a rubber composition with silica compounded in place of carbon black as a reinforcing agent into a diene rubber so as to improve heat build-up resistance. However, the silica-compounded rubber composition has involved problems that since its processability is poorer compared with the carbon black-compounded rubber composition, the heat build-up resistance cannot be sufficiently developed, and that it is insufficient in tensile strength and the like. A cause for these problems is considered to be attributed to the fact that the affinity of the silica for the diene rubber is lower than that of the carbon black, so that the processability becomes poor, and a reinforcing effect cannot be sufficiently developed.
In order to enhance the affinity of the silica for the diene rubber, it has heretofore been proposed to use a silane coupling agent (Japanese Patent Application Laid-Open Nos. 252431/1991 and 252433/1991, etc.). However, the mere use of the silane coupling agent is not yet sufficient for the improving effect on heat build-up resistance, tensile strength and processability.
In order to enhance the affinity of the silica for the diene rubber, it has also been investigated to use a diene rubber with a substituent group having high affinity for silica introduced therein. For example, a diene rubber with a tertiary amino group introduced therein has been proposed for a diene rubber according to an emulsion polymerization process (Japanese Patent Application Laid-Open No. 101344/1989). Besides, a diene rubber with a substituent group having a polar group, such as an alkylsilyl group (Japanese Patent Application Laid-Open No. 188501/1989), a halogenated silyl group (Japanese Patent Application Laid-Open No. 230286/1993) or a substituted amino group (Japanese Patent Application Laid-Open No. 22940/1989) introduced therein has been proposed for a diene rubber according to an anionic polymerization process. However, the diene rubbers with these substituent groups having a polar group introduced therein have demerits that their processability is poor upon blending with silica, and their properties such as heat build-up resistance and tensile strength are not sufficiently improved.
On the other hand, with respect to polyether-based polymers, rubbery or resinous polymers have been known. As examples of rubber compositions comprising a polyether-based polymer as a main component, there have been reported a rubber composition comprising 70 parts by weight of an epichlorohydrin-allyl glycidyl ether copolyme
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Inagaki Katsumi
Nakamura Masao
Takagishi Yukio
Michl Paul R.
Nippon Zeon Co. Ltd.
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