US 8,540,869 B2Granted

Method for forming finished lubricants

AssigneeChevron U.S.A. Inc.

InventorsJohn A. Zakarian, Angelito T. Tirona

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Abstract

A method for forming a finished lubricant comprises selecting a target high temperature viscosity for the finished lubricant. A target high temperature viscosity for a base oil blend is selected. The target high temperature viscosity for the base oil blend is less than the target high temperature viscosity for the finished lubricant. At least two base oils from at least three viscosity grades of base oils are selected and mixed to form a base oil blend that meets the target high temperature viscosity for the base oil blend. The base oil blend is mixed with performance additive package and viscosity modifier to provide a finished lubricant that meets the target high temperature viscosity for the finished lubricant. The at least two base oils for the base oil blend having the target high temperature viscosity are selected such that less viscosity modifier is needed to meet the target high temperature viscosity of the finished lubricant.

Claims15

Dependent claims

A method of selecting two or more base oils to formulate a base oil blend with improved thickening efficiency, wherein the selecting is based on compositional properties of the two or more base oils, the method comprising:

measuring a weight percentage naphthenic carbon of a higher viscosity base oil, wherein the higher viscosity base oil comprises one or more from the group consisting of:
a medium-light base oil and a medium base oil;
measuring a weight percentage naphthenic carbon of a lower viscosity base oil, wherein the lower viscosity oil comprises one or more from the group consisting of:
an extra-light base oil and a light base oil;
determining a first difference between the weight percentage naphthenic carbon of the higher viscosity base oil and the weight percentage naphthenic carbon of the lower viscosity base oil;
determining the first difference is within a first numerical range, wherein the first numerical range is between 0.10 and 1.5 weight percentage;
after determining the first difference is within the first numerical range:
selecting the higher viscosity base oil;
selecting the lower viscosity base oil;
blending the higher viscosity base oil and the lower viscosity base oil to formulate a base oil blend;
blending the base oil blend with a performance additive package to form a base blend;
and
blending the base blend with an amount of a high molecular weight polymer viscosity modifier to form a finished lubricant.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/000,184Filed 10 Dec 2007
Published: US 2009/0149360 A111 Jun 2009
Granted: 24 Sep 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification17 codes

C10M 111/04
Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups…:…
C10M 169/041
Mixtures of base-materials and additives: the additives being macromolecular compounds only
C10M 2205/173
Fisher Tropsch reaction products: used as base material
C10M 2209/084
Containing monomers having an unsaturated radical bound to a carboxyl radical, e.g. acrylate type: acrylate; Methacrylate

Family

US 2009/0149360 A1Pre-grant publication · published 11 Jun 2009
US 8,540,869 B2This patent

From the US filing history. Foreign family members aren’t listed.

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