Mineral oil type base oil, and vacuum pump oil
AssigneeIdemitsu Kosan Co., Ltd.
InventorTokue Sato
Life of this patent
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Abstract
Provided is a mineral base oil that conforms to viscosity grades VG22 to VG100 as defined in ISO 3448 and exhibits a distillation curve with a temperature gradient Δ|DT| of distillation temperature between two points of 2.0 vol % and 5.0 vol % of distillation amount being 6.8° C./vol % or less. A vacuum pump oil containing the mineral base oil is excellent in vacuum characteristics and can conform to viscosity grades VG22 to VG100 as defined in ISO 3448.
Claims19
A vacuum pump oil, consisting of:
- a base oil (I), which is a mineral base oil;
- an antioxidant (I), which is an amine-based antioxidant;
- optionally a base oil (II);
- optionally an antioxidant (II), which optionally comprises a phenol-based antioxidant;
- optionally a metal deactivator;
- and
- optionally an antifoaming agent,
- wherein the base oil (I) exhibits a distillation curve with
- a temperature gradient Δ|Dt| of distillation temperature between two points of 2.0 vol % and 5.0 vol % of distillation amount being 6.8° C./vol % or less,
- a distillation temperature at which the distillation amount is 2.0 vol % being 405° C. to 510° C., and
- a distillation temperature at which the distillation amount is 5.0 vol % being from 425° C. to 550° C., and
- the base oil (I) has a kinematic viscosity at 40° C. of 28.8 mm2/s to 110.0 mm2/s.
A method of using a vacuum pump oil, the method comprising supplying the vacuum pump oil to a vacuum pump,
- wherein the vacuum pump oil consists of:
- a base oil (I), which is a mineral base oil;
- an antioxidant (I), which is an amine-based antioxidant;
- optionally a base oil (II);
- optionally an antioxidant (II), which optionally comprises a phenol-based antioxidant;
- optionally a metal deactivator;
- and
- optionally an antifoaming agent,
- wherein the base oil (I) exhibits a distillation curve with
- a temperature gradient Δ|Dt| of distillation temperature between two points of 2.0 vol % and 5.0 vol % of distillation amount being 6.8° C./vol % or less,
- a distillation temperature at which the distillation amount is 2.0 vol % being 405° C. to 510° C., and
- a distillation temperature at which the distillation amount is 5.0 vol % being from 425° C. to 550° C., and
- the base oil (I) has a kinematic viscosity at 40° C. of 28.8 mm2/s to 110.0 mm2/s.
A vacuum pump, comprising a vacuum pump oil consisting of:
- a base oil (I), which is a mineral base oil;
- an antioxidant (I), which is an amine-based antioxidant;
- optionally a base oil (II);
- optionally an antioxidant (II), which optionally comprises a phenol-based antioxidant;
- optionally a metal deactivator;
- and
- optionally an antifoaming agent,
- wherein the base oil (I) exhibits a distillation curve with
- a temperature gradient Δ|Dt| of distillation temperature between two points of 2.0 vol % and 5.0 vol % of distillation amount being 6.8° C. vol % or less,
- a distillation temperature at which the distillation amount is 2.0 vol % being 405° C. to 510° C., and
- a distillation temperature at which the distillation amount is 5.0 vol % being from 425° C. to 550° C., and
- the base oil (I) has a kinematic viscosity at 40° C. of 28.8 mm2/s to 110.0 mm2/s.
Dependencies are inferred from the claim text.