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US 9,012,384 B2Granted
Method of preparing greases
AssigneeChevron U.S.A. Inc.
InventorsDavid S. Lee, Rhett W. Jones
Life of this patent
Estimating the term…
Abstract
Provided is a method for preparing a grease composition, which comprises mixing an amine in a lubricating bas oil and an isocyanate in a lubricating base oil under high pressure and high flow rate impingement. In one embodiment, the mixing and reaction occurs in a reaction injection molding device. The resulting grease composition is an extremely low noise grease, being virtually clear of any urea thickener particles.
Claims11
A method for preparing a grease comprising:
- a) preparing a first mixture comprised of a lubricating base oil and at least one amine, and a second mixture comprised of a lubricating base oil and at least one isocyanate,
- b) mixing the two mixtures together in a mixing zone under high pressure in the range of from about 1000 to 8000 psi and high flow rate impingement conditions to thereby have the at least one amine and at least one isocyanate react and have the reaction product dispersed throughout the lubricating base oil, with the reaction and dispersion occurring nearly simultaneously to create a grease product, and
- c) recovering the grease product directly from the mixing zone, wherein the grease product exhibits a dropping point of greater than 500° F. and a change in penetration value from P(60) to P(100,000) of less than 100 penetration points.
Dependencies are inferred from the claim text.