Back to results
US 5,180,865 AGranted
Base oil for shear stable multi-viscosity lubricants and lubricants therefrom
AssigneePennzoil Products Company
InventorsWilliam J. Heilman, Clifford G. Venier
Life of this patent
Estimating the term…
Abstract
Fully synthetic lubricating base oil compositions are formulated from blends of 50-97 wt % of synthetic hydrocarbons and 3-50 wt % isobutylene oligomers. The lubricating base oil compositions have constant viscosity indexes which are higher than those of the components used to form the compositions. The synthetic hydrocarbon and isobutylene oligomers are combinable in various amounts with conventional additives to form multi-grade engine lubricants, which are shear stable.
Claims4
A fully synthetic lubricating composition consisting essentially of:
- (a) about 50-97 weight percent of a synthetic hydrocarbon selected from the group consisting of a poly-alphaolefin, an alkylated cyclopentane, an alkylated cyclopentadiene, an alkylated cyclopentene, an alkylated benzene, and alkylated cyclohexane, or mixtures thereof;
- (b) about 3 to 50 weight percent of isobutylene oligomer, said isobutylene have a molecular weight of about 900 to 6,000, and a higher viscosity than said synthetic hydrocarbon, and
- (c) up to about 5 weight percent of a lubricating additive, wherein the lubricating additive is selected from the group consisting of pour point depressants, viscosity index improvers, corrosion inhibitors, antioxidants, and mixtures thereof.
Dependencies are inferred from the claim text.