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US 11,198,834 B2Granted
Grease composition
AssigneeIdemitsu Kosan Co., Ltd.
InventorsHiroki Sekiguchi, Go Watanabe
Life of this patent
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Abstract
Provided is a grease composition including a base oil (A) containing an alkyl naphthalene (A1) and an aliphatic diurea (B) represented by general formula (b1): R1—NHCONH—R3—NHCONH—R2 (b1) (wherein, R1 and R2 each independently represent a monovalent aliphatic hydrocarbon group having 9 to 20 carbon atoms, and R3 represents a divalent aromatic hydrocarbon group having 6 to 18 carbon atoms), wherein a content of the aliphatic diurea (B) is 20 to 30% by mass based on a total amount of the grease composition.
Claims6
A lubrication method, comprising:
- applying a grease composition to parts of an apparatus that is manufactured or used in a clean room to lubricate the parts;
- wherein
- the grease composition comprises a base oil (A) containing an alkyl naphthalene (A1), and an aliphatic diurea (B) represented by formula (b1):
- R1—NHCONH—R3—NHCONH—2 (b1)
- wherein, R1 and R2 each independently represent a monovalent aliphatic hydrocarbon group having 9 to 20 carbon atoms, and R represents a divalent aromatic hydrocarbon group having 6 to 18 carbon atoms,
- wherein a content of the aliphatic diurea (B) is from 22% to 30% by mass based on a total amount of the grease composition;
- wherein a worked penetration of the grease composition at 25° C. is 250 or more;
- wherein a kinematic viscosity at 40° C. of the base oil (A) is from 20 to 30 mm2/s;
- wherein a content of the alkyl naphthalene (A1) in the grease composition is from 70 to 100% by mass based on a total amount of the base oil (A);
- wherein the part of the apparatus is selected from portions to be lubricated of the group consisting of bearings, sliding portions and joint portions of a semiconductor manufacturing apparatus, a liquid crystal manufacturing apparatus or a printed circuit board manufacturing apparatus.
7 more elements
Dependencies are inferred from the claim text.