Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1998-06-24
2000-07-04
Cain, Edward J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524190, 524236, 524258, 524260, C08K 533
Patent
active
060840153
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a rubber composition. More specifically it relates to a rubber composition obtained by compounding a compound containing free radicals having a powerful radical trapping character into a rubber composition, which is superior in processability, has a high gripping force and low heat buildup, prevents oxidative aging during abrasion, improves the abrasion resistance, and is superior in the balance of the high wet braking performance and low rolling resistance (i.e., tan .delta. balance).
BACKGROUND ART
Various attempts have been made to improve the processability of rubber compositions, particularly rubber compositions for pneumatic tires, and the other properties of tires and other products. There is particularly strong need for a rubber composition superior in processability, high in gripping force of the tire, low in heat buildup, and improved in abrasion resistance. For example, Japanese Unexamined Patent Publication (Kokai) No. 62-148544 discloses a rubber composition containing a reinforcing filler and isomaleimide compounded with a natural rubber or synthetic diene rubber, to obtain the improved green strength and green modulus, a low heat buildup and excellent crack growth resistance. Further, Japanese Unexamined Patent Publication (Kokai) No. 7-304305 discloses a pneumatic tire obtained from a composition comprised of rubber in which a mixture of p-phenylene diamine antioxidant, 2,2,4-trimethyl-1,2-dehydroquinoline (or its derivative) and a specific carbon black is compounded, whereby, while maintaining an excellent steering stability and high grip performance, the abrasion resistance is improved. Further, there are needs for a rubber composition superior in processability, high in abrasion resistance when made a tire, and superior in the balance between the high wet braking performance and low rolling resistance. The stabilization of a polymer with a stable free radical is described in Japanese Unexamined Patent Publication (Kokai) No. 8-239510. The effect of preventing rubber deterioration with a stable free radical has been proposed in Japanese Patent Application No. 8-284080. On the other hand, the fact that a reaction of a rubber having a reactive group such as an amino group with a carbon black reduces the hysteresis and decreases the rolling resistance is described in, for example, Japanese Unexamined Patent Publication (Kokai) No. 8-269131. Further, Japanese Unexamined Patent Publication (Kokai) No. 8-283461, Japanese Unexamined Patent Publication (Kokai) No. 8-283462, etc. disclose rubber and carbon black are reacted using thiadiazole or a hydrazide compound, whereby the dispersibility is improved and the heat buildup is reduced.
DISCLOSURE OF THE INVENTION
Accordingly, an object of the present invention is to provide a rubber composition having a superior processability, superior balance of high grip/low heat buildup, and improved abrasion resistance.
Another object of the present invention is to provide a rubber composition having a superior processability, superior balance of high wet braking performance/low rolling resistance (i.e., tan .delta. balance), and improved abrasion resistance.
In accordance with the present invention, there is provided a rubber composition comprising 100 parts by weight of at least one diene rubber at least 40 parts by weight of at least one reinforcing agent and 0.1 to 10 parts by weight of at least one compound containing, in the molecule thereof, a radical capable of being stably present at room temperature in the presence of oxygen, selected from the group consisting of nitroxide radicals, hydrazyl radicals, allyloxyl radicals, and trityl radicals and the analogues thereof.
In accordance with another aspect of the present invention, there is provided a rubber composition comprising 100 parts by weight of at least one diene rubber, at least 20 parts by weight of at least one reinforcing agent and 0.1 to 10 parts by weight of a compound containing at least one radical selected from the group consisting
REFERENCES:
patent: 4306953 (1981-12-01), Schlesinger
Chino Keisuke
Ikawa Masahiro
Ito Masayoshi
Kaido Hiroyuki
Yatsuyanagi Fumito
Cain Edward J.
The Yokohama Rubber Co. Ltd.
LandOfFree
Rubber composition does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Rubber composition, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rubber composition will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1487195