	US 12,410,263 B2
	Modified high-Cis polybutadiene polymer, related methods and rubber compositions
Jeffrey A. Cicerchi, Akron, OH (US); Terrence E. Hogan, Uniontown, OH (US); and James J. Kuhel, Jr., Stow, OH (US)
Assigned to Bridgestone Americas Tire Operations, LLC, Nashville, TN (US)
Appl. No. 17/609,331
Filed by Bridgestone Americas Tire Operations, LLC, Nashville, TN (US)
PCT Filed May 7, 2020, PCT No. PCT/US2020/031874 § 371(c)(1), (2) Date Nov. 5, 2021, PCT Pub. No. WO2020/227531, PCT Pub. Date Nov. 12, 2020.
Claims priority of provisional application 62/844,314, filed on May 7, 2019.
Prior Publication US 2022/0144974 A1, May 12, 2022
Int. Cl. C08L 9/06 (2006.01); B60C 1/00 (2006.01); C08C 19/25 (2006.01); C08F 4/54 (2006.01); C08K 3/013 (2018.01); C08K 3/04 (2006.01); C08K 3/36 (2006.01); C08K 5/00 (2006.01); C08L 19/00 (2006.01)

CPC C08C 19/25 (2013.01) [B60C 1/0016 (2013.01); C08F 4/545 (2013.01); C08K 3/013 (2018.01); C08K 3/04 (2013.01); C08K 3/36 (2013.01); C08K 5/0016 (2013.01); C08K 5/005 (2013.01); C08L 9/06 (2013.01); C08L 19/006 (2013.01)]

17 Claims

1. A modified high-cis polybutadiene polymer having

polymer chains bonded to a residue of a functionalizing compound having formula (I) as follows

where X is a group reactive with the living end polymer chains and is selected from the group consisting of cyano, epoxy, ketone, aldehyde, ester, and acid anhydrides,

R¹is selected from hydrocarbylene of C₁-C₂₀, wherein each of the foregoing optionally contain one unsaturated carbon-carbon bond,

each R′ is selected from alkoxy of C₁-C₂₀, and

R″ is selected from alkyl of C₁-C₂₀or aryl of C₆-C₂₀,

wherein each polymer chain is bonded to the residue of the functionalizing compound through the X group, and the modified high-cis polybutadiene polymer has

a cis 1,4-bond content of 92-98%,

an initial Mooney viscosity ML₁₊₄at 100° C. of 20-100, and

an aged Mooney viscosity ML₁₊₄at 100° C. of no more than 120, wherein the aged Mooney viscosity is determined after aging at 100° C. for 2 days.