High molecular weight dispersant compositions and their preparation
AssigneeExxon Chemicals Patents Inc.
InventorsGary Higton, Jacob Emert, Robert A. Wilkinson, Isabel P. MacDonald, Karl J. Van Driesen, Salvatore Rea, James P. Stokes, Andrew J. D. Ritchie
Life of this patent
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Abstract
Concentrates for lubricating oil compositions are prepared by mixing at elevated temperature: (i) at least one high molecular weight ashless dispersant; (ii) at least one oil-soluble overbased metal detergent; and (iii) at least one surface-active agent comprising a low molecular weight hydroxyl or amine group.
Claims25
A process for preparing an oleaginous additive concentrate comprising the step of blending components (i), (ii) and (iii) at a temperature greater than about 60° C. to 120° C. wherein (i) is at least one unborated ashless dispersant having a hydrodynamic radius of about 8 to 40 nm;
- (ii) is at least one oil-soluble overbased metal detergent;
- and (iii) is at least one surface-active agent having a number average molecular weight less than 600 and containing at least one hydroxyl or amino group;
- wherein the weight ratio of said dispersant to said detergent is about 1:1 to 8:1, the amount of said surface-active agent is about 0.1 to 20 wt. % based on the total weight of said dispersant, and the sum of components (i) and (ii) on an active ingredient basis is about 30 to 60 wt % based on the total weight of said concentrate.
A process for preparing an oleaginous additive concentrate suitable for use in making a lubricating oil composition comprising the step of blending components (i), (ii) and (iii) at a temperature greater than about 60° C. to 120° C. wherein (i) is at least one borated or unborated ashless polyamine-derivatized polymer dispersant selected from the group consisting of a poly(isobutylene) dispersant having a number average molecular weight of about 7000 to 20,000 or a weight average molecular weight of about 17,000 to 50,000, and a poly(alpha-olefin) dispersant having a number average molecular weight of about 3000 to 20,000 or a weight average molecular weight of about 6,000 to 50,000;
- (ii) is at least one oil-soluble overbased metal detergent;
- and (iii) is at least one surface-active agent having a number average molecular weight less than about 600 containing at least one hydroxyl or amino group;
- wherein the weight ratio of said dispersant to said detergent is about 1:1 to 8:1, the amount of said surface-active agent is 0.1 to 20 wt. % based on the total weight of said dispersant, and the sum of components (i) and (ii) is about 30 to 60 wt % based on the total weight of said concentrate.
Dependencies are inferred from the claim text.