Modified block copolymers and process of preparing the same

Details Modified block copolymers and process of preparing the same Modified block copolymers and process of preparing the same

1976-06-14

1978-04-11

De Benedictis, Thomas

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

252 334, 252 336, 252 421, 252 475, 252 486, 252 496, 252 515R, 252 52A, 252 56R, 260827, 260887, C08L 906, C08L 4304, C10M 140

Patent

active

040838951

ABSTRACT:
Using a novel process of one or more combined steps, modified novel block copolymers are prepared by alkylating or hydrogenating a block copolymer precursor containing at least two segments, in which segment A consists of a styrene polymer, either styrene alone or a hydrogenated random butadiene-styrene copolymer and from 1% to about 50% by weight of segment B being an alkylene oxide or sulfide copolymerized with the first segment as an AB or BAB copolymer. These novel copolymers perform as multifunctional additives in industrial organic compositions, both hydrocarbon fluids, such as petroleum-derived, and non-hydrocarbon, or synthetic fluids, providing such utility as detergency, emulsification and viscosity index improvement. These copolymers have molecular weights in the range of from about 1,000 to 500,000. The copolymers are particularly useful in lubricating oils, greases and fuels, especially cross-graded lubricants, crude oils, diesel oils, gasoline and fuel oils. Copolymers capped with metal diisocyanate have excellent thermal and oxidative stability.

REFERENCES:
patent: 3867295 (1975-02-01), Schwab et al.
patent: 3954915 (1976-05-01), Schwab et al.

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