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US 5,314,634 AGranted
Polyester viscosity index improver
AssigneeUnilever Patent Holdings B.V.
InventorsDirk Kenbeek, Ramires R. Poulina, Gijsbert Van der Waal
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Abstract
The invention provides a polyester based on dimeric fatty acid, a glycol without hydrogen atoms at an alpha carbon atom in which a C3-C12 monoalcohol chainstopper is present and which contains approximately equivalent quantities of acid and alcohol groups. Preferably the dimer acid contains 36 carbon atoms and the monoalcohol is a branched chain C6-C10 alkanol. The invention also provides lubricant compositions comprising 30-2% (w.w.) of the polyester and 70-98% (w.w.) of an synthetic lubricant base.
Claims7
A polyester consisting essentially of:
- a dimeric fatty acid containing 36 carbon atoms obtained by dimerization of C18 unsaturated fatty acids, and
- a glycol without hydrogen atoms at an alpha carbon atom,
- wherein said polyester contains a C3-C12 monoalcohol chainstopper and said polyester contains approximately equivalent quantities of acid and alcohol groups.
Dependencies are inferred from the claim text.