Polyolefinic copolymer additives for lubricants and fuels
AssigneeRohm and Haas Company
InventorsRobert L. Stambaugh, Richard A. Galluccio
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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 a monomer system comprising maleic acid or anhydride and one or more other monomers copolymerizable therewith, the monomer system being post-reacted with a polyamine compound. The graft copolymers impart combined detergent, viscosity index improvement and other useful properties to lubricating oils and hydrocarbon motor fuels.
Claims26
A composition comprising a major amount of a lubricating oil and a minor detergent amount of a graft copolymer comprising an oil soluble, substantially linear, substantially saturated, rubbery, olefinic hydrocarbon backbone polymer and graft polymerized thereon, copolymerized units of a monomer system comprising maleic acid or maleic anhydride and one or more other monomers copolymerizable with maleic acid or maleic anhydride, said copolymerized units being post-reacted with a polyamino compound having one reactive primary or secondary amino group.
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) a graft monomer system comprising maleic acid or maleic anhydride and at least one other monomer copolymerizable therewith, and (c) a free radical initiator, 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, followed by post-reaction of the monomer system with a polyamino compound having one reactive primary or secondary amino group.
A composition comprising a major amount of a hydrocarbon motor fuel and a minor detergent amount of a graft copolymer comprising an oil soluble, substantially linear, substantially saturated, rubbery, olefinic hydrocarbon backbone polymer and graft polymerized thereon, copolymerized units of a monomer system comprising maleic acid or maleic anhydride and one or more other monomers copolymerizable with maleic acid or maleic anhydride, said copolymerized units being post-reacted with a polyamino compound having one reactive primary or secondary amino group.
A graft copolymer useful as an additive for lubricating oils and hydrocarbon motor fuels, comprising an oil soluble, substantially linear, substantially saturated, rubbery, olefinic hydrocarbon backbone polymer and graft polymerized thereon, copolymerized units of a monomer system comprising maleic acid or maleic anhydride and one or more other monomers copolymerizable with maleic acid or maleic anhydride, said copolymerized units being post-reacted with a polyamino compound having one reactive primary or secondary amino group.
A process for preparing a graft copolymer useful as a lubricating oil or hydrocarbon motor fuel additive, comprising intimately admixing (a) an oil soluble, substantially linear, substantially saturated, rubbery, olefinic hydrocarbon backbone polymer, (b) a graft monomer system comprising maleic acid or maleic anhydride and at least one other monomer copolymerizable therewith, and (c) a free radical initiator, 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, followed by post-reaction of the monomer system with a polyamino compound having one reactive primary or secondary amino group.
Dependencies are inferred from the claim text.