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US 12,534,682 B2Granted
Viscosity index enhancer composition, additive composition for lubricating oil, and lubricating oil composition
AssigneeIdemitsu Kosan Co., Ltd.
InventorsShota Kato, Yukio Yoshida
Life of this patent
Estimating the term…
Abstract
A viscosity index improver composition which has an excellent viscosity index improving effect. A viscosity index improver composition which includes a poly(meth)acrylate (A) including a constituent unit (Y) derived from a monomer (y) having a diol functional group, and a poly(meth)acrylate (B) including a constituent unit (Z) derived from a monomer (z) having a boronic acid ester.
Claims20
A viscosity index improver composition, comprising:
- a poly(meth)acrylate (A) comprising a constituent unit (Y) derived from a monomer (y) having a diol functional group;
- and
- a poly(meth)acrylate (B) comprising a constituent unit (Z) derived from a monomer (z) having a boronic acid ester,
- wherein both the poly(meth)acrylate (A) and the poly(meth)acrylate (B) further comprise a constituent unit (X1) derived from a (meth)acrylate (x1) having a linear alkyl group which has 4 or less carbon atoms in the side chain, and a constituent unit (X3) derived from (meth)acrylate (x3) having a branched alkyl group which has 24 to 38 carbon atoms in the side chain, or
- wherein one of the poly(meth)acrylate (A) and the poly(meth)acrylate (B) further comprises the constituent unit (X1) and the constituent unit (X3), and at least the other of the poly(meth)acrylate (A) and the poly(meth)acrylate (B) further comprises a constituent unit (X2) derived from (meth)acrylate (x2) having a linear or branched alkyl group which has 10 to 23 carbon atoms in the side chain.
2 more elements
Dependencies are inferred from the claim text.