Polyester viscosity index improver
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United States of America Patent
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May 24, 1994
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N/A
app pub date -
Mar 17, 1989
filing date -
Mar 18, 1988
priority date (Note) -
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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.
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