C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 9/00 (2006.01) B60C 1/00 (2006.01) C08K 3/36 (2006.01) C08K 5/54 (2006.01)
Patent
CA 2282955
It has been unexpectedly determined that isoprene-butadiene rubber having a high glass transition temperature within the range of about -40°C to about -25°C (high Tg IBR) can be loaded with silica as a filler and utilized in manufacturing tire treads that have outstanding performance characteristics. For instance, such tire treads offer lower hysteresis at high temperatures (improved rolling resistance) and higher hysteresis at low temperatures (improved wet traction characteristics). By utilizing high Tg IBR in tire tread compounds, the maximum benefits of silica compounding can be realized without the need for solution or emulsion styrene-butadiene rubber (SBR) in the tread rubber formulations. The tire tread rubber formulations of this invention will normally contain about 20 phr (parts per 100 parts of rubber) to about 100 phr of the high Tg IBR. In other words, the tread rubber will normally contain at least 20 phr of the high Tg IBR and can contain up to 100 phr of the high Tg IBR. The tread compound will also contain 40 phr to 150 phr of a filler with the proviso that at least about 20 phr of silica is included in the filler. The tire tread compound will also contain a silica coupling agent. This invention more specifically discloses a tire tread rubber composition which is comprised of (1) at least about 20 phr of an isoprene-butadiene rubber having a glass transition temperature which is within the range of about -40°C to -25°C, (2) 40 phr to 150 phr of a filler, with the proviso that the filler contains at least about 20 phr of silica, and (3) a silica coupling agent.
Halasa Adel Farhan
Hsu Wen-Liang
Louis Olivier
Smart & Biggar
The Goodyear Tire & Rubber Company
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