Defoaming agent and lubricating oil composition
AssigneeJxtg Nippon Oil & Energy Corporation
InventorsAkira Takagi, Shingo Matsuki
Life of this patent
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Abstract
A defoaming agent comprising: a polymer comprising a repeating unit represented by the following general formula (1): where in the general formula (1), X1 is a repeating unit obtainable by polymerization of an ethylenic unsaturated group; Y1 is a side chain comprising a linear or branched polysiloxane structure, the polysiloxane structure comprising a repeating unit represented by the following general formula (2) and having a polymerization degree of 5 to 300; and Z1 is a linking group linking the repeating unit X1 and the side chain Y1; wherein in the general formula (2), R1 and R2 are each independently an organic group having a carbon number of 1 to 18.
Claims17
A defoaming agent comprising:
- a polymer comprising a repeating unit represented by the following general formula (1):
- wherein in the general formula (1), X1 is a repeating unit obtainable by polymerization of a first ethylenic unsaturated group;
- Y1 is a side chain comprising a linear or branched polysiloxane structure, the polysiloxane structure comprising a repeating unit represented by the following general formula (2) and having a polymerization degree of 5 to 300;
- and Z1 is a linking group linking the repeating unit X1 and the side chain Y1;
- wherein in the general formula (2), R1 and R2 are each independently an organic group having a carbon number of 1 to 18;
- the polymer further comprising a repeating unit represented by the following general formula (3):
- wherein in the general formula (3), X2 is a repeating unit obtainable by polymerization of a second ethylenic unsaturated group;
- Y2 is a side chain comprising no less than 3 fluorine atoms;
- and Z2 is a linking group linking the repeating unit X2 and the side chain Y2.
A defoaming agent comprising:
- a polymer comprising a repeating unit represented by the following general formula (1):
- wherein in the general formula (1), X1 is a repeating unit obtainable by polymerization of a first ethylenic unsaturated group;
- Y1 is a side chain comprising a linear or branched polysiloxane structure, the polysiloxane structure comprising a repeating unit represented by the following general formula (2) and having a polymerization degree of 5 to 300;
- and Z1 is a linking group linking the repeating unit X1 and the side chain Y1;
- wherein in the general formula (2), R1 and R2 are each independently an organic group having a carbon number of 1 to 18;
- wherein the polymer is a star-shaped polymer.
A lubricating oil composition comprising:
- (A) a lubricant base oil;
- and
- (B) a defoaming agent in an amount of 1 to 100 mass ppm in terms of silicon on the basis of the total mass of the composition, the defoaming agent comprising a polymer, the polymer comprising a repeating unit represented by the following general formula (1):
- wherein in the general formula (1), X1 is a repeating unit obtainable by polymerization of a first ethylenic unsaturated group;
- Y1 is a side chain comprising a linear or branched polysiloxane structure, the polysiloxane structure comprising a repeating unit represented by the following general formula (2) and having a polymerization degree of 5 to 300;
- and Z1 is a linking group linking the repeating unit X1 and the side chain Y1;
- wherein in the general formula (2), R1 and R2 are each independently an organic group having a carbon number of 1 to 18,
- wherein X1 is a repeating unit obtainable by polymerization of a first (meth)acryloyl group.
Dependencies are inferred from the claim text.