Verbesserte Schmieroele und Verfahren zu ihrer Herstellung

摘要

1,223,500. Butadiene-styrene copolymerization and hydrogenation. PHILLIPS PETROLEUM CO. 29 Nov., 1968 [30 Nov., 1967], No. 56797/68. Heading C3P. [Also in Division C5] A hydrogenated random butadiene-styrene copolymer having a butadiene content of 30- 44% is prepaied by copolymerizing butadiene and styrene in the presence of BuLi and subsequent hydrogenation of the olefinic, but not aromatic, unsaturation in the product. The copolymer is used as a viscosity index improver in mineral lubricating oil compositions. The polymerization was carried out in cyclohexane solution in the presence of THF. Hydrogenation was effected with nickel octoate and Et 3 Al at 350‹ F. and a H 2 pressure of 400 p.s.i.g.