US2012108481A1PendingUtilityA1
Lubricating composition
Est. expiryJun 9, 2029(~2.9 yrs left)· nominal 20-yr term from priority
C10M 2209/084C10M 145/14C10N 2040/04C10N 2030/26C10M 2209/04
32
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Claims
Abstract
The present invention provides a lubricating composition comprising: a base oil; and a viscosity index improver containing poly(meth)acrylate having hydroxyl groups in the structure and having a hydroxyl value of from 22 to 37.
Claims
exact text as granted — not AI-modified1 . A lubricating composition comprising:
a base oil; and a viscosity index improver containing poly(meth)acrylate having hydroxyl groups in the structure and having a hydroxyl value of from 22 to 37.
2 . The lubricating composition according to claim 1 wherein the viscosity index improver contains from 50 to 100 mass parts of poly(meth)acrylate having hydroxyl groups in the structure, and from 50 to 0 mass parts of poly(meth)acrylate not having hydroxyl groups in the structure.
3 . The lubricating composition according to claim 1 wherein the poly(meth)acrylate of the viscosity index improver has a mass average molecular weight of from 5,000 to 50,000.
4 . The lubricating composition according to claim 1 wherein the viscosity index improver is present in an amount of from 1 to 8 mass %, based on the total weight of the lubricating composition, as net polymer, excluding diluent oil.
5 . The lubricating composition according to claim 1 , further containing another additive selected from extreme pressure agents, anti-wear additives, pour point depressants, antioxidants, metal deactivators, oiliness agents, defoaming agents and rust inhibitors.
6 . The use of a lubricating composition according to claim 1 in the drive systems of a vehicle.Cited by (0)
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