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US 2020/0048574 A1Published application
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.
Claims9
1:
- A grease composition comprising 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 from 20 to 30% by mass based on a total amount of the grease composition.
1 more element
2:
- The grease composition according to claim 1, which has a worked penetration at 25° C. of 220 or more.
3:
- The grease composition according to claim 1, wherein a kinematic viscosity at 40° C. of the base oil (A) is from 20 to 30 mm2/s.
4:
- The grease composition according to claim 1, further comprising a poly-α-olefin in an amount of less than 10 parts by mass based on 100 parts by mass of the alkyl naphthalene (A1).
5:
- The grease composition according to claim 1, further comprising a mineral oil in an amount of less than 10 parts by mass based on 100 parts by mass of the alkyl naphthalene (A1).
6:
- The grease composition according to claim 1, further comprising a metal atom-containing compound in an amount of less than 5% by mass based on a total amount of the grease composition.
7:
- The grease composition according to claim 1, wherein a content of the alkyl naphthalene (A1) is from 50 to 100% by mass based on a total amount of the base oil (A).
8:
- The grease composition according to claim 1, which is to be used for an apparatus that is used in a clean room.
9:
- The grease composition according to claim 1, which is to be used for an apparatus that is used for food production.