The Goodyear & Tire Rubber Company

James Edward Duddey

John M Cady

A pneumatic tire having the apex area around the carcass ply turnup comprised of a rubber having 2.2 to 25 phr of the reaction product of a partially polymerized cashew nutshell oil resin and a methylene donor.

Tire with apex rubber containing in-situ resin

The subject invention is based upon the unexpected discovery that tires having outstanding dry and wet traction characteristics, including wet skid resistance, can be made by incorporating certain blends of styrene-butadiene rubber (SBR) and isoprene-butadiene rubber (IBR) into the treads thereof without greatly sacrificing rolling resistance and tread wear characteristics. This invention more specifically discloses a tire tread rubber composition which is comprised of (a) about 50 phr to about 85 phr of a SBR and (b) about 15 phr to about 50 phr of an IBR, wherein the IBR is comprised of repeat units which are derived from about 20 weight percent to about 50 weight percent isoprene and from about 50 weight percent to about 80 weight percent 1,3-butadiene, wherein the repeat units derived from isoprene and 1,3-butadiene are in essentially random order, wherein from about 3 percent to about 10 percent of the repeat units in the IBR are 1,2-polybutadiene units, wherein from about 50 percent to about 70 percent of the repeat units in the IBR are 1,4-polybutadiene units, wherein from about 1 percent to about 4 percent of the repeat units in the IBR are 3,4-polyisoprene units, wherein from about 25 percent to about 40 percent of the repeat units in the IBR are 1,4-polyisoprene units, wherein the IBR has a glass transition temperature which is within the range of about &minus;90&deg; C. to about &minus;75&deg; C. and wherein the IBR has a Mooney viscosity which is within the range of about 55 to about 140.

Tread rubber for high traction tires

An improved nonpneumatic tire for a motor vehicle is described. The tire has a rim and one or more elastomeric materials bonded to the rim or to one another. The tire has an equatorial plane, an annular tread rotatable about an axis, and an annular elastomeric body. The elastomeric body has at least 48 openings, a first set of at least 24 openings extend from the first side and a second set of at least 24 openings extend from a second side, both sets extending toward the equatorial plane. The openings form equally spaced columns. The columns formed by the first set of openings are inclined to the radial direction. The columns formed by the second set of openings are inclined opposite to the columns of the first set. The improved tire is characterized by columns having cross sections equidistant from the equatorial plane. The cross section of each of the columns increases in thickness from a minimum to maximums at the radially inner and radially outer extremes of the column.

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Akron, OH, United States of America

James Edward Duddey