Patent ID: 7134468

Claim:
A pneumatic rubber tire having an integral innerliner of a sulfur cured rubber composition comprised of, based upon parts by weight per 100 parts by weight of total rubber (phr), (A) 100 phr of elastomers comprised of: (1) butyl type rubber as: (a) about 60 to 100 phr of halobutyl rubber selected from at least one of bromobutyl rubber and chlorobutyl rubber and their mixtures, and (b) zero to about 30 phr of butyl rubber; (2) zero to about 20 phr of at least one diene-based elastomer selected from polymers of at least one of isoprene and 1,3-butadiene and copolymers of styrene and at least one of isoprene and 1,3-butadiene, and their mixtures, and (3) zero to about 30 phr of at least one partially depolymerized bromobutyl rubber, chlorobutyl butyl rubber, butyl rubber and their mixtures, and (B) about 1 to about 30 phr of corncob granules comprised of granules of the woody ring of corncobs, wherein at least 90 percent of said corncob granules have an average diameter in a range of from about 50 to about 500 microns; and (C) about 30 to about 110 phr of reinforcing filler comprised of: (1) about 30 to about 110 phr of rubber reinforcing carbon black, or (2) about 5 to about 70 phr of rubber reinforcing carbon black and from about 5 to about 70 phr of synthetic amorphous precipitated silica aggregates together with a coupling agent having a moiety reactive with hydroxyl groups on said precipitated silica aggregates and another different moiety interactive with said diene-based elastomer(s).