Copolymer compositions usable as additives for lubricating oils

Details Copolymer compositions usable as additives for lubricating oils Copolymer compositions usable as additives for lubricating oils

1986-11-07

1988-07-12

Schofer, Joseph L.

Compositions

Electrolytes for electrical devices

5263292, C10M10104, C08F22012

Patent

active

047568437

ABSTRACT:
Compositions of copolymers are disclosed containing 10 to 35% by weight of units derived from at least one vinylaromatic monomer, 5 to 15% by weight of units derived from at least one linear or branched alkyl methacrylate with 1 to 4 carbon atoms, 20 to 50% by weight of units derived from at least one linear alkyl methacrylate with 8 to 14 carbon atoms and 15 to 50% by weight of units derived from at least one linear alkyl methacrylate with 16 to 22 carbon atoms. The copolymer compositions have a weight average molecular weight of 100,000 to 400,000 and a polydispersity index in general of less than 5.
They are prepared by any free-radical copolymerization method using for example azo or peroxide initiators.
These compositions have the advantage of providing a better compromise between the characteristics required of a viscosity additive for lubricating oils.

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