FIELD: chemical industry. SUBSTANCE: addition agent based on hydrogenated stylene-butadiene block copolymer has unsymmetric B/S-S-B structure of general formula:
wherein B/S block= a1+b1+c1, molecular weight 40000-130000; S block=c2=12-37 wt %, molecular weight 8500-55000; B block=a2+c2=1-5 wt %, molecular 1000-8000; c1+c2=50-65 wt %, a1+a2= 30-50 wt % per olefinic moiety. Addition agents of claimed structure have better thermooxidizing stability and high thickening property. EFFECT: improved properties of lubricating oils. 2 tbl
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Authors
Dates
1998-04-27—Published
1995-07-04—Filed