| 摘要 |
<p>A substantially haze-free lubricating oil composition comprising a lubricating oil and from about 0.1 to 50 wt. %, based upon the total weight of said composition of ethylene copolymeric dispersant-viscosity index improver material, which material has been formed by (a) grafting an ethylene copolymer comprising about 30 to 80 wt. % ethylene and about 20 to 70 % C3 to C18 alpha olefin, with an ethylenically unsaturated compound selected form the group consisting of unsaturated carboxylic acid and anhydride of carboxylic acid, said ethylene copolymer when grafted with said carboxylic acid or said anhydride being further reacted with a polyfunctional reactant selected from the group consisting of polyamine, polyol and hydroxy amine, and reacting with from about 0.1 to 8 wt. % of an oil-soluble hydrocarbyl substituted strong acid containing from about 3 to about 70 total carbons to thereby inhibit haze in said composition, and wherein said strong acid is selected from the group consisting of alkyl carboxylic acids, phosphoric acid, phosphonic acid, thiophosphonic acid, phosphinic acid, thiophosphinic acid, sulfonic acid, sulfuric acid, sulfinic acid and alpha-substituted haloor nitro- or nitrilo-carboxylic acids; or (b) grafting an ethylene copolymer comprising about 30 to 80 wt. % ethylene and about 20 to 70 wt % C3 to C18 alpha olefin, with a vinyl monomer containing nitrogen, and reacting with from about 0.1 to 8 wt. % of an oil-soluble hydrocarbyl substituted strong acid containing from about 3 to about 70 total carbons, to thereby inhibit haze in said composition.</p> |
