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US 2002/0055445 A1Published application
Viscosity modifier for lubricating oil and lubricating oil composition
AssigneesMitsui Chemicals, Inc., The Lubrizol Corporation
InventorsKeiji Okada, Ryousuke Kaneshige
Life of this patent
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Abstract
A viscosity modifier for lubricating oils which is capable of giving a lubricating oil composition excellent low-temperature properties; and a lubricating oil composition which contains the viscosity modifier and has excellent low-temperature properties. The modifier comprises of any of ethylene/propylene copolymers (A), (B) and (C). The composition comprises a combination of any of the ethylene/propylene copolymers (A), (B) and (C) with a lube base oil (D), and optionally a pour point depressant (E).
Claims9
A viscosity modifier for a lubricating oil, comprising an ethylene/propylene copolymer (A) having the following properties (a-1) to (a-5):
- (a-1) the density is in the range of 857 to 882 kg/m3,
- (a-2) the weight-average molecular weight as measured by gel permeation chromatography is in the range of 80,000 to 400,000 in terms of polystyrene,
- (a-3) Mw/Mn (Mw:
- weight-average molecular weight, Mn:
- number-average molecular weight), which is an indication of a molecular weight distribution, is not more than 2.3,
- (a-4) the melting point as measured by a differential scanning calorimeter is in the range of 15 to 60° C., and
- (a-5) the density (D (kg/m3)) and the melting point (Tm (° C.)) as measured by a differential scanning calorimeter satisfy the following relation (I)
- Tm≦1.247×D−1037 (I).
5 more elements
A viscosity modifier for a lubricating oil, comprising an ethylene/propylene copolymer (B) having the following properties (b-1) to (b-5):
- (b-1) the content of recurring units derived from ethylene is in the range of 70 to 79% by weight,
- (b-2) the weight-average molecular weight as measured by gel permeation chromatography is not less than 80,000 and less than 250,000 in terms of polystyrene,
- (b-3) Mw/Mn (Mw:
- weight-average molecular weight, Mn:
- number-average molecular weight), which is an indication of a molecular weight distribution, is not more than 2.3,
- (b-4) the melting point as measured by a differential scanning calorimeter is in the range of 15 to 60° C., and
- (b-5) the content (E (% by weight)) of recurring units derived from ethylene and the melting point (Tm (° C.)) as measured by a differential scanning calorimeter satisfy the following relation (II)
- 3.44×E−206≧Tm (II).
5 more elements
A viscosity modifier for a lubricating oil, comprising an ethylene/propylene copolymer (C) having the following properties (c-1) to (c-5):
- (c-1) the content of recurring units derived from ethylene is in the range of 70 to 79% by weight,
- (c-2) the weight-average molecular weight as measured by gel permeation chromatography is in the range of 250,000 to 400,000 in terms of polystyrene,
- (c-3) Mw/Mn (Mw:
- weight-average molecular weight, Mn:
- number-average molecular weight), which is an indication of a molecular weight distribution, is not more than 2.3,
- (c-4) the melting point as measured by a differential scanning calorimeter is in the range of 15 to 60° C., and
- (c-5) the content (E (% by weight)) of recurring units derived from ethylene and the melting point (Tm (° C.)) as measured by a differential scanning calorimeter satisfy the following relation (III)
- 3.44×E−204≧Tm (III).
5 more elements
A lubricating oil composition comprising:
- (A) an ethylene/propylene copolymer, and
- (D) a lubricating oil base,
- wherein the ethylene/propylene copolymer (A) is contained in an amount of 1 to 20% by weight and has the following properties (a-1) to (a-5):
- (a-1) the density is in the range of 857 to 882 kg/m3,
- (a-2) the weight-average molecular weight as measured by gel permeation chromatography is in the range of 80,000 to 400,000 in terms of polystyrene,
- (a-3) Mw/Mn (Mw:
- weight-average molecular weight, Mn:
- number-average molecular weight), which is an indication of a molecular weight distribution, is not more than 2.3,
- (a-4) the melting point as measured by a differential scanning calorimeter is in the range of 15 to 60° C., and
- (a-5) the density (D (kg/m3)) and the melting point (Tm (° C.)) as measured by a differential scanning calorimeter satisfy the following relation (I)
- Tm≦1.247×D−1037 (I).
8 more elements
A lubricating oil composition comprising:
- (B) an ethylene/propylene copolymer, and
- (D) a lubricating oil base,
- wherein the ethylene/propylene copolymer (B) is contained in an amount of 1 to 20% by weight and has the following properties (b-1) to (b-5):
- (b-1) the content of recurring units derived from ethylene is in the range of 70 to 79% by weight,
- (b-2) the weight-average molecular weight as measured by gel permeation chromatography is not less than 80,000 and less than 250,000 in terms of polystyrene,
- (b-3) Mw/Mn (Mw:
- weight-average molecular weight, Mn:
- number-average molecular weight), which is an indication of a molecular weight distribution, is not more than 2.3,
- (b-4) the melting point as measured by a differential scanning calorimeter is in the range of 15 to 60° C., and
- (b-5) the content (E (% by weight)) of recurring units derived from ethylene and the melting point (Tm (° C.)) as measured by a differential scanning calorimeter satisfy the following relation (II)
- 3.44×E−206≧Tm (II)
8 more elements
A lubricating oil composition comprising:
- (C) an ethylene/propylene copolymer, and
- (D) a lubricating oil base,
- wherein the ethylene/propylene copolymer (C) is contained in an amount of 1 to 20% by weight and has the following properties (c-1) to (c-5):
- (c-1) the content of recurring units derived from ethylene is in the range of 70 to 79% by weight,
- (c-2) the weight-average molecular weight as measured by gel permeation chromatography is in the range of 250,000 to 400,000 in terms of polystyrene,
- (c-3) Mw/Mn (Mw:
- weight-average molecular weight, Mn:
- number-average molecular weight), which is an indication of a molecular weight distribution, is not more than 2.3,
- (c-4) the melting point as measured by a differential scanning calorimeter is in the range of 15 to 60° C., and
- (c-5) the content (E (% by weight)) of recurring units derived from ethylene and the melting point (Tm (° C.)) as measured by a differential scanning calorimeter satisfy the following relation (III)
- 3.44×E−204≧Tm (III).
8 more elements
A lubricating oil composition comprising:
- (A) an ethylene/propylene copolymer,
- (D) a lubricating oil base, and
- (E) a pour point depressant,
- wherein the ethylene/propylene copolymer (A) is contained in an amount of 0.1 to 5% by weight, the pour point depressant (E) is contained in an amount of 0.05 to 5% by weight, and the ethylene/propylene copolymer (A) has the following properties (a-1) to (a-5):
- (a-1) the density is in the range of 857 to 882 kg/m3,
- (a-2) the weight-average molecular weight as measured by gel permeation chromatography is in the range of 80,000 to 400,000 in terms of polystyrene,
- (a-3) Mw/Mn (Mw:
- weight-average molecular weight, Mn:
- number-average molecular weight), which is an indication of a molecular weight distribution, is not more than 2.3,
- (a-4) the melting point as measured by a differential scanning calorimeter is in the range of 15 to 60° C., and
- (a-5) the density (D (kg/m3)) and the melting point (Tm (° C.)) as measured by a differential scanning calorimeter satisfy the following relation (I)
- Tm≦1.247×D−1037 (I).
9 more elements
A lubricating oil composition comprising:
- (B) an ethylene/propylene copolymer,
- (D) a lubricating oil base, and
- (E) a pour point depressant,
- wherein the ethylene/propylene copolymer (B) is contained in an amount of 0.1 to 5% by weight, the pour point depressant (E) is contained in an amount of 0.05 to 5% by weight, and the ethylene/propylene copolymer (B) has the following properties (b-1) to (b-5):
- (b-1) the content of recurring units derived from ethylene is in the range of 70 to 79% by weight,
- (b-2) the weight-average molecular weight as measured by gel permeation chromatography is not less than 80,000 and less than 250,000 in terms of polystyrene,
- (b-3) Mw/Mn (Mw:
- weight-average molecular weight, Mn:
- number-average molecular weight), which is an indication of a molecular weight distribution, is not more than 2.3,
- (b-4) the melting point as measured by a differential scanning calorimeter is in the range of 15 to 60° C., and
- (b-5) the content (E (% by weight)) of recurring units derived from ethylene and the melting point (Tm (° C.)) as measured by a differential scanning calorimeter satisfy the following relation (II)
- 3.44×E−206≧Tm (II).
9 more elements
A lubricating oil composition comprising:
- (C) an ethylene/propylene copolymer,
- (D) a lubricating oil base, and
- (E) a pour point depressant,
- wherein the ethylene/propylene copolymer (C) is contained in an amount of 0.1 to 5% by weight, the pour point depressant (E) is contained in an amount of 0.05 to 5% by weight, and the ethylene/propylene copolymer (C) has the following properties (c-1) to (c-5):
- (c-1) the content of recurring units derived from ethylene is in the range of 70 to 79% by weight,
- (c-2) the weight-average molecular weight as measured by gel permeation chromatography is in the range of 250,000 to 400,000 in terms of polystyrene,
- (c-3) Mw/Mn (Mw:
- weight-average molecular weight, Mn:
- number-average molecular weight), which is an indication of a molecular weight distribution, is not more than 2.3,
- (c-4) the melting point as measured by a differential scanning calorimeter is in the range of 15 to 60° C., and
- (c-5) the content (E (% by weight)) of recurring units derived from ethylene and the melting point (Tm (° C.)) as measured by a differential scanning calorimeter satisfy the following relation (III)
- 3.44×E−204≧Tm (III).
9 more elements
Dependencies are inferred from the claim text.