초록

The invention relates to an endless vehicular rubber track. The invention particularly relates to such track having a ground-contacting tread component of a rubber composition.

대표청구항 ▼

[ What is claimed is:] [1.]1. An endless rubber track designed to encompass at least one drive wheel and at least one driven wheel, comprised of an inner component containing a plurality of lugs designed to be engaged and/or guided by said drive and driven wheels and an outer tread component, said t

[ What is claimed is:] [1.]1. An endless rubber track designed to encompass at least one drive wheel and at least one driven wheel, comprised of an inner component containing a plurality of lugs designed to be engaged and/or guided by said drive and driven wheels and an outer tread component, said tread component being of a configuration comprised of a plurality of co-extensive, raised lugs thereon designed to be ground engaging; wherein said tread component is of a rubber composition comprised of, based upon 100 parts by weight elastomers (phr),(A) elastomers comprised of(1) about 15 to about 40 phr of cis 1,4-polybutadiene rubber and, correspondingly;(2) at least one additional elastomer selected from(i) about 60 to about 85 phr of natural cis 1,4-polyisoprene rubber; and(ii) zero to about 15 phr of styrene/butadiene copolymer rubber containing from 10 to 40 percent bound styrene;(B) about 40 to about 80 phr of reinforcing filler comprised of carbon black and a minor amount of precipitated silica; wherein said carbon black is present in an amount of about 35 to about 65 phr and said precipitated silica is present in an amount of from 3 to about 20 phr and the ratio of said carbon black to precipitated silica is in a range of about 4/1 to about 7/1; wherein said reinforcing filler is exclusive of a coupling agent having a moiety reactive with silanol groups on the surface of said silica and another moiety interactive with said elastomer(s);(C) sulfur curative in a range of about 0.75 to about 1.5 phr and a sulfenamide sulfur cure accelerator;(D) about 4.5 to about 10 phr of antidegradant; and(E) zero to about 10 phr of rubber processing oil selected from at least one of aromatic rubber processing oil and mixture of aromatic and naphthenic rubber processing oil; wherein said carbon black is characterized by having an Iodine Number in a range of about 115 to about 130 g/kg, a DBP value in a range of about 105 to about 125 cm.sup.3 /100 g, and a Tint value in a range of about 120 to about 140.