Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Solid hydrocarbon polymer
Reexamination Certificate
1999-11-02
2001-10-16
McAvoy, Ellen M. (Department: 1764)
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Solid hydrocarbon polymer
C525S333300
Reexamination Certificate
active
06303550
ABSTRACT:
The present invention relates to lubricating oil compositions, in particular, lubricating oil compositions having di-block copolymers of poly(monovinyl aromatic hydrocarbon) and poly(conjugated diene) as dispersants.
High molecular weight oil-soluble di-block copolymers can be used for improving the effective viscosity index (VI) of lubricating oil formulations. The VI is a measure of the tendency of a fully formulated oil to resist decrease in viscosity with increasing temperature. The higher the viscosity index—the more the fully formulated oil can resist viscosity decrease with increasing temperature. Base oils have an inherent VI but this is normally not adequate for all engine operational needs.
Specifically synthesised ashless dispersants are added to fully formulated crankcase lubricant oils to keep combustion-derived soots and oxidation-derived sludges in dispersion. Generally, these are surface active molecules of 2000 to 6000 Daltons molecular weight. For example, polyisobutylene (PIB) is chemically linked to maleic anhydride (MALA) to give a covalently bonded compound PIBMALA. This may then be reacted with a variety of polyamines or polyalcohols to give a range of molecules; PIBMALA amines and PIBMALA esters. Typically the PIB will be in the molecular weight range 1000 to 3000 Dalton, and the polyamine will be diethylene triamine (DETA), triethylene tetramine (TETA) or higher polyamine homologues. These molecules are surface active and can maintain in a stable colloid state, soots and sludges in a crankcase lubricating oil.
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De Jong Feike
Wedlock David J.
Infineum USA L.P.
McAvoy Ellen M.
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