US 12,264,232 B2
Modified high-cis polybutadiene polymer, related methods and tire components
Ryan J. Hue, Akron, OH (US); Laura S. Kocsis, Akron, OH (US); Terrence E. Hogan, Uniontown, OH (US); and Jeffrey A. Cicerchi, Akron, OH (US)
Assigned to Bridgestone Corporation, Chuo-ku (JP); and Bridgestone Americas Tire Operations, LLC, Nashville, TN (US)
Appl. No. 17/610,902
Filed by Bridgestone Corporation, Chuo-ku (JP); and Bridgestone Americas Tire Operations, LLC, Nashville, TN (US)
PCT Filed May 14, 2020, PCT No. PCT/US2020/032821
§ 371(c)(1), (2) Date Nov. 12, 2021,
PCT Pub. No. WO2020/232212, PCT Pub. Date Nov. 19, 2020.
Claims priority of provisional application 62/847,894, filed on May 14, 2019.
Prior Publication US 2022/0213300 A1, Jul. 7, 2022
Int. Cl. C08L 15/00 (2006.01); B60C 1/00 (2006.01); C08C 19/25 (2006.01); C08F 4/54 (2006.01); C08F 136/06 (2006.01); C08K 3/04 (2006.01); C08K 3/36 (2006.01); C08K 5/01 (2006.01)
CPC C08L 15/00 (2013.01) [B60C 1/0016 (2013.01); C08C 19/25 (2013.01); C08F 4/545 (2013.01); C08F 136/06 (2013.01); C08K 3/04 (2013.01); C08K 3/36 (2013.01); C08K 5/01 (2013.01); C08F 2810/40 (2013.01); C08L 2205/02 (2013.01)] 16 Claims
 
1. A modified high-cis polybutadiene polymer having
polymer chains bonded to a residue of a functionalizing compound having formula (I) as follows

OG Complex Work Unit Chemistry
where X is a cyano group,
R1 is independently selected from hydrocarbylene of C1-C20 optionally containing one unsaturated carbon-carbon bond,
each R′ is independently selected from alkoxy of C1-C20, and
wherein each polymer chain is bonded to the residue of the functionalizing compound through the X group, and the polymer has
a cis 1,4-bond content of 92-98%,
an initial Mooney viscosity ML1+4 at 100° C. of 20-100, and
an aged Mooney viscosity ML1+4 at 100° C. of no more than 120, as determined after aging at 100° C. for 2 days.