Lubricating oil additive composition and lubricating oil composition
AssigneeIdemitsu Kosan Co., Ltd.
InventorsYukio Yoshida, Shota Kato, Hideto Kamimura
Life of this patent
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Abstract
A lubricating oil additive composition that is suitable as a load bearing additive, and is excellent in wear resistance, extreme pressure property, and thermal stability, and a lubricating oil composition containing the lubricating oil additive composition. A lubricating oil additive composition containing a poly(meth)acrylate-based copolymer (X) containing a structural unit (a) derived from a particular alkyl (meth)acrylate (A), a structural unit (b) derived from a particular hydroxy group containing (meth)acrylate (B), and a structural unit (c) derived from a particular phosphorus-containing (meth)acrylate (C).
Claims14
A lubricating oil additive composition comprising a poly(meth)acrylate-based copolymer (X) containing a structural unit (a) derived from an alkyl (meth)acrylate (A) represented by the following general formula (a-1), a structural unit (b) derived from a hydroxy group-containing (meth)acrylate (B) represented by the following general formula (b-1), and a structural unit (c) derived from a phosphorus-containing (meth)acrylate (C) represented by the following general formula (c-1):
- wherein in the general formula (a-1), Ra1 represents a hydrogen atom or a methyl group;
- and Ra2 represents an alkyl group having 8 to 20 carbon atoms,
- wherein in the general formula (b-1), Rb1 represents a hydrogen atom or a methyl group;
- Rb2 represents an alkylene group having 2 to 4 carbon atoms;
- and m1 represents an integer of 1 to 10, in which in the case where m1 represents an integer of 2 or more, plural groups represented by Rb2 may be the same as or different from each other,
- wherein in the general formula (c-1), Rc1 represents a hydrogen atom or a methyl group;
- Rc2 represents an ethylene group;
- m2 represents an integer of 1 to 6, in which in the case where m2 represents an integer of 2 or more, plural groups represented by Rc2 may be the same as or different from each other;
- n represents an integer of 1 or 2;
- and in the case where n=1, at least one of plural groups represented by Rc3 is a hydrogen atom, and in the case where n=2, Rc3 represents a hydrogen atom.
A method for producing a lubricating oil additive composition, comprising producing a poly(meth)acrylate-based copolymer (X) by polymerizing an alkyl (meth)acrylate (A) represented by the following general formula (a-1), a hydroxy group-containing (meth)acrylate (B) represented by the following general formula (b-1), and a phosphorus-containing (meth)acrylate (C) represented by the following general formula (c-1):
- wherein in the general formula (a-1), Ra1 represents a hydrogen atom or a methyl group;
- and Ra2 represents an alkyl group having 8 to 20 carbon atoms,
- wherein in the general formula (b-1), Rb1 represents a hydrogen atom or a methyl group;
- Rb2 represents an alkylene group having 2 to 4 carbon atoms;
- and m1 represents an integer of 1 to 10, in which in the case where m1 represents an integer of 2 or more, plural groups represented by Rb2 may be the same as or different from each other,
- wherein in the general formula (c-1), Rc1 represents a hydrogen atom or a methyl group;
- Rc2 represents an ethylene group;
- m2 represents an integer of 1 to 6, in which in the case where m2 represents an integer of 2 or more, plural groups represented by Rc2 may be the same as or different from each other;
- n represents an integer of 1 or 2;
- and in the case where n=1, at least one of plural groups represented by Rc3 is a hydrogen atom, and in the case where n=2, Rc3 represents a hydrogen atom.
Dependencies are inferred from the claim text.