Polymers useful as lubricant additives - prepd. from anionic diene! polymers by reaction with nitrogen cpd. and hydrogenation

摘要

New polymers are prepd. by subjecting =1 4-6C conjugated diene and opt. =1 vinylaromatic cpd. to anionic polymerisation to form a polymer with a Mn of 20,000-300,000 (pref. 30,000-150,000) and subjecting this to (a) reaction with a non-polymerisable N cpd. contg. =2 C-N=C gps. and (b) hydrogenation. The initial polymer is pref. a polymer of butadiene, isoprene or dimethylbutadiene, a statistical or block copolymer of one of these dienes with styrene or alpha-methylstyrene, or a star-shaped copolymer also contg. divinylbenzene. It is pref. prepd. by anionic polymerisation at -80 to 150 degrees C (esp. 0-100 degrees) in the presence of an organometallic catalyst (esp. n-BuLi or 1,4-dilithio-1,1,4,4-tetraphenylbutane). The prods. are useful as VI improvers and dispersant additives for lubricants.