PNEUMATIC TIRE HAVING TREAD WITH THREE ELASTOMERS
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United States of America Patent
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Issued Date -
Sep 22, 2022
app pub date -
Mar 16, 2021
filing date -
Mar 16, 2021
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Abstract
A pneumatic tire comprising a vulcanizable rubber composition which comprises: 1) 100 parts by weight of elastomer consisting of 25 to 35 phr of a styrene-butadiene rubber, 45 to 75 phr of a polybutadiene, and 5 to 15 phr of a natural rubber or synthetic polyisoprene, wherein the styrene-butadiene rubber is a functionalized and has a Tg(A) ranging from −30 to −10° C.; the natural rubber or synthetic polyisoprene has a Tg(B) ranging from −60 to −70° C.; and the polybutadiene is a cis 1,4 polybutadiene having a Tg(C) ranging from −110 to −90° C., wherein Tg(A)−Tg(B)≥25° C., and Tg(B)−Tg(C)≥25° C.; 2) 70 to 100 phr of silica; 3) 1 to 20 phr of carbon black; 4) 1 to 15 phr of rubber processing oil; and 5) 5 to 50 phr of at least one hydrocarbon resin having a Tg≥20° C. and a rosin derived resin.
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