Oil-soluble polyester, additive for lubricating oil, and lubricating oil composition
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United States of America Patent
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Jul 14, 1998
Grant Date -
N/A
app pub date -
Feb 12, 1996
filing date -
Feb 10, 1995
priority date (Note) -
Expired
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Abstract
An oil-soluble polyester having a weight average molecular weight of 10,000 to 1 000,000, which is a polycondensate prepared by polycondensing the following ingredients (A), (B) and (C): (A) a divalent higher carboxylic acid ingredient, (B) a divalent alcohol ingredient comprising a glycol represented by the following formula: HO--CH.sub.2 --CR.sup.1 R.sup.2 --CH.sub.2 --OH wherein R.sup.1 and R.sup.2 represent a alkyl group, and the sum of carbon numbers in R.sup.1 and R.sup.2 is at least three, and (C) 0.1 to 15% by mole, based on the total of ingredients (A) and (B), of at least one multi-valent ingredient selected from a carboxylic acid with a valency of at least three and an alcohol with a valency of at least three. This oil-soluble polyester is useful as an additive for a lubricating oil.
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