VISCOSITY ADDITIVE FOR LUBRICATING OILS, PROCESS FOR THE PREPARATION THEREOF, AND LUBRICANT COMPOSITIONS BASED ON SAID ADDITIVE

摘要

Viscosity additive containing:… - 6 to 15 parts of a 60/40-54/46 ethylene/propylene copolymer of Mw 155,000 - 250,000 (OCP - 2 to 8 parts of a poly(C1-C20 alkyl methacrylate) of Mw 30,000 - 150,000 (PMA) with a PMA/OCP ratio of 1/5 to 1/1… - and the remainder to 100 parts of diluent oil. …??Lubricating compositions containing 0.1 to 10% of the said additive.