Grafted copolymers and their use as additives for lubricating oils

摘要

Graft copolymer formed by reacting at least one polymerizable vinyl compound in monomeric or polymerized form, with a hydrogenated polymer or copolymer selected from the hydrogenated homopolymers of conjugated dienes of 4-6 carbon atoms, the hydrogenated copolymers of at least 2 conjugated dienes and the hydrogenated copolymers of styrene and conjugated dienes of 4-6 carbon atoms, said hydrogenated polymer or copolymer having an average molecular weight ranging from 10.000 to 300.000 and a residual olefinic unsaturation lower than 15%.