Tire having tread composition comprising an improved processing aid
AssigneeUniroyal Chemical Company, Inc.
InventorsRobert J. Cornell, Sung W. Hong
Life of this patent
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Abstract
Tires possessing a tread composition formed by curing a blend comprised of: (A) at least one suitable rubber; (B) an effective amount of curative; (C) carbon black; and (D) a processing aid comprised of (i) C.sub.12 -C.sub.50 paraffin wax; and (ii) pentaerythritol tetrastearate, which processing aid preferably further comprises a carrier such as calcium carbonate are most easily processed and exhibit improved handling, durability and rolling resistance as well as reduced heat buildup.
Claims11
A tire having a tread composition formed by curing a blend comprised of:
- A. a rubber selected from the group consisting of natural rubber, cis-polyisoprene, polybutadiene, solution poly(styrene-butadiene), emulsion poly(styrene-butadiene), ethylene/propylene/nonconjugated diene terpolymer and poly(acrylonitrile-butadiene);
- B. between about 0.2 and about 5 phr of a curative selected from the group consisting of sulfur, sulfur donor compounds, hydroperoxides and peroxides;
- C. between about 30 and about 100 phr of carbon black;
- and
- D. between about 0.5 and about 10 phr of a processing aid comprised of:
- (1) C.sub.12 -C.sub.50 parraffin wax:
- and
- (11) pentaerythritol tetrastearate wherein the weight ratio of pentaerythritol tetrastearate to C.sub.12 -C.sub.50 paraffin wax is between abaout 12:1 and about 2:1.
A tire in accordance with claim 15 wherein between about 50 and about 80 phr of carbon black is present.
Dependencies are inferred from the claim text.