Polyolefinic copolymer additives for lubricants and fuels
AssigneeRohm and Haas Company
InventorsRobert L. Stambaugh, Richard A. Galluccio
Life of this patent
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Abstract
Graft copolymers wherein the backbone polymer is a polymeric hydrocarbon such as ethylene/propylene copolymer and the grafted units are the residues of an addition copolymerizable monomer system comprising an unsaturated polycarboxylic acid or anhydride and at least one other addition monomer. Preferably, the monomer residues are post-reacted with an alcohol or an amino alcohol. The graft copolymers are prepared with a free radical initiator which is blended with the reactants at a temperature below the initiator decomposition temperature, followed by heating to the decomposition temperature. The graft copolymers impart combined detergent, viscosity index improvement and other useful properties to lubricating oils and hydrocarbon motor fuels.
Claims24
A composition comprising a major amount of a lubricating oil and a minor detergent amount of a graft copolymer prepared by intimately admixing (a) an oil soluble, substantially linear, substantially saturated, rubbery, olefinic hydrocarbon backbone polymer, (b) an addition copolymerizable graft monomer system comprising an unsaturated polycarboxylic acid or anhydride and at least one other monomer copolymerizable therewith, and (c) a free radical initiator capable of hydrogen abstraction, the temperature during admixing in the presence of the initiator being below the decomposition temperature of the initiator, and thereafter increasing the temperature of the mixture to or above the decomposition temperature of the initiator.
A composition comprising a major amount of a hydrocarbon motor fuel and a minor detergent amount of a graft copolymer prepared by intimately admixing (a) an oil soluble, substantially linear, substantially saturated, rubbery, olefinic hydrocarbon backbone polymer, (b) an addition copolymerizable graft monomer system comprising an unsaturated polycarboxylic acid or anhydride and at least one other monomer copolymerizable therewith, and (c) a free radical initiator capable of hydrogen abstraction, the temperature during admixing in the presence of the initiator being below the decomposition temperature of the initiator, and thereafter increasing the temperature of the mixture to or above the decomposition temperature of the initiator.
A graft copolymer useful as an additive for lubricating oils and hydrocarbon motor fuels, prepared by intimately admixing (a) an oil soluble, substantially linear, substantially saturated, rubbery, olefinic hydrocarbon backbone polymer, (b) an addition copolymerizable graft monomer system comprising an unsaturated polycarboxylic acid or anhydride and at least one other monomer copolymerizable therewith, and (c) a free radical initiator capable of hydrogen abstraction, the temperature during admixing in the presence of the initiator being below the decomposition temperature of the initiator, and thereafter increasing the temperature of the mixture to or above the decomposition temperature of the initiator.
A process for preparing an oil soluble graft copolymer useful as an additive for lubricating oils and hydrocarbon motor fuels, comprising the steps of (1) intimately admixing (a) an oil soluble, substantially linear, substantially saturated, rubbery, olefinic hydrocarbon backbone polymer, (b) an addition copolymerizable graft monomer system comprising an unsaturated polycarboxylic acid or anhydride and at least one other monomer copolymerizable therewith, and (c) a free radical initiator capable of hydrogen abstraction, and (2) thereafter increasing the temperature of the mixture to or above the decomposition temperature of the initiator.
Dependencies are inferred from the claim text.