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US 5,294,354 AGranted
Combining dispersant viscosity index improver and detergent additives for lubricants
AssigneeTexaco Inc.
InventorsBrian L. Papke, Isaac D. Rubin, John Castrogiovanni, Jr.
Life of this patent
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Abstract
Lubricants with enhanced viscosities are made from additives by combining dispersant viscosity index improver, like dispersant nitrogen-substituted polyolefins, and detergent, like select overbased, oil-soluble, metal salts, before adding dispersant package.
Claims11
A process for making a lubricant composition by:
- (1) combining:
- (a) dispersant viscosity index improver, which is a polyolefin of ethylene, C.sub.3-20 .alpha.-monoolefin, and optionally polyene, having a number average molecular weight of at least about 10,000, which is grafted with ethylenically unsaturated, nitrogen-containing, heterocyclic compound, with;
- (b) detergent, which is an overbased, oil-soluble, calcium sulfonate which interacts with the viscosity index improver to give increased lubricant viscosity at high temperatures;
- to make a premix, followed by;
- (2) combining the premix with lubricating oil and dispersant package to make a lubricant composition with enhanced viscosification.
2 more elements
Dependencies are inferred from the claim text.