US 11,926,802 B2
Lubricating oil composition with viscosity modifier based on syndiotactic propylene-based ethylene- propylene copolymers with improved properties
Sara Yue Zhang, Danville, CA (US); Maryam Sepehr, San Ramon, CA (US); David L. Morgan, Pleasanton, CA (US); Jingwen Zhang, Houston, TX (US); Jo Ann M. Canich, Houston, TX (US); Peijun Jiang, Katy, TX (US); John R. Hagadorn, Houston, TX (US); Chase A. Eckert, Houston, TX (US); Sarah J. Mattler, League City, TX (US); Shuhui Kang, Houston, TX (US); and Pritesh Arjunbhai Patel, Danville, CA (US)
Assigned to EXXONMOBIL CHEMICAL PATENTS INC., Houston, TX (US); and CHEVRON ORONITE COMPANY LLC, San Ramon, CA (US)
Filed by CHEVRON ORONITE COMPANY LLC, San Ramon, CA (US); and EXXONMOBIL CHEMICAL PATENTS INC., Houston, TX (US)
Filed on Nov. 4, 2022, as Appl. No. 18/052,601.
Claims priority of provisional application 63/276,025, filed on Nov. 5, 2021.
Prior Publication US 2023/0174883 A1, Jun. 8, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C10M 143/04 (2006.01); C08F 210/06 (2006.01); C10M 169/04 (2006.01); C10N 20/04 (2006.01); C10N 30/02 (2006.01); C10N 40/25 (2006.01)
CPC C10M 143/04 (2013.01) [C08F 210/06 (2013.01); C10M 169/041 (2013.01); C08F 2800/20 (2013.01); C10M 2203/003 (2013.01); C10M 2205/024 (2013.01); C10N 2020/04 (2013.01); C10N 2030/02 (2013.01); C10N 2040/25 (2013.01)] 25 Claims
 
1. A lubricant oil composition comprising:
a major amount of a lubricant base oil; and
a minor amount of a viscosity index improver comprising a syndiotactic propylene-based ethylene-propylene copolymer comprising:
a) 2 to 20% by weight of ethylene
b) 80 to 98% by weight of propylene;
c) 50 to 99% rr triads; and
d) Mw (LS) of 10 to 250 kg/mol.