Polyolefin graft copolymers
AssigneeRohm and Haas Company
InventorsRobert L. Stambaugh, Richard A. Galluccio
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Abstract
Graft copolymers wherein the backbone polymer is a rubbery, oil soluble ethylene-propylene copolymer or ethylene-propylene diene modified terpolymer and the graft monomer is a C-vinylpyridine or N-vinylpyrrolidone impart dispersant properties to hydrocarbon fuels and combined viscosity index improvement and dispersant properties to lubricating oils for internal combustion engines. The graft copolymers are prepared by intimate admixture of backbone polymer, graft monomer and free radical initiator at a temperature below initiation temperature, followed by a temperature increase to or above initiation temperature, thus providing a product containing little or no byproduct.
Claims34
A lubricating oil containing a viscosity index improving and dispersant amount of a graft copolymer consisting essentially of an oil soluble, substantially linear, rubbery hydrocarbon backbone polymer selected from ethylene/propylene copolymer and ethylene/propylene diene modified terpolymer, said backbone polymer having graft polymerized thereon monomer units selected from C-vinylpyridines and N-vinylpyrrolidone.
A hydrocarbon fuel containing a dispersant amount of a graft copolymer consisting essentially of an oil soluble, substantially linear, rubbery hydrocarbon backbone polymer selected from ethylene/propylene copolymer and ethylene/propylene diene modified terpolymer, said backbone polymer having graft polymerized thereon graft monomer units selected from C-vinylpyridines and N-vinylpyrrolidone.
A process for preparing a graft copolymer, comprising intimately admixing (a) an oil soluble, substantially linear, rubbery hydrocarbon backbone polymer selected from ethylene/propylene copolymer and ethylene/propylene copolymer diene modified terpolymer, (b) graft monomer selected from C-vinylpyridines and N-vinylpyrrolidone, and (c) a free radical initiator capable of hydrogen abstraction, said admixing being effected at a temperature below the decomposition temperature of the initiator, and raising the temperature of the reaction mixture to or above said decomposition temperature.
A graft copolymer effective for imparting dispersant properties to hydrocarbon fuels and both dispersancy and viscosity index improvement to lubricating oils, said graft copolymer consisting essentially of an oil soluble, substantially linear, rubbery hydrocarbon backbone polymer selected from ethylene/propylene copolymer and ethylene/propylene diene modified terpolymer, said backbone polymer having graft polymerized thereon monomer units selected from C-vinyl-pyridines and N-vinylpyrrolidone.
Dependencies are inferred from the claim text.