US 11,912,861 B2
Rubber composition for lighter weight tires and improved wet traction
Xiao-Dong Pan, Houston, TX (US)
Assigned to ExxonMobil Engineering & Technology Co., Baytown, TX (US)
Filed by ExxonMobil Chemical Patents Inc., Baytown, TX (US)
Filed on Oct. 28, 2021, as Appl. No. 17/513,445.
Claims priority of provisional application 63/107,151, filed on Oct. 29, 2020.
Prior Publication US 2022/0135789 A1, May 5, 2022
Int. Cl. C08L 65/00 (2006.01); C08L 9/00 (2006.01); B60C 11/00 (2006.01); B60C 1/00 (2006.01); C08G 61/08 (2006.01); C08K 3/04 (2006.01); C08K 3/36 (2006.01)
CPC C08L 65/00 (2013.01) [B60C 1/0016 (2013.01); B60C 11/0008 (2013.01); C08G 61/08 (2013.01); C08K 3/04 (2013.01); C08K 3/36 (2013.01); C08L 9/00 (2013.01); B60C 2011/0025 (2013.01); C08L 2205/025 (2013.01); C08L 2312/00 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A rubber compound for tire treads, comprising:
30 phr to 70 phr of a cyclopentene ring-opening rubber having a glass transition temperature (Tg) of −120° C. to −80° C., a ratio of cis to trans of 5:95 to 20:80, and a weight average molecular weight (Mw) of 300 kDa to 500 kDa; and
20 phr to 60 phr of a high vinyl polybutadiene rubber having a vinyl content of at least about 50% vinyl.