Lubricating oil compositions of reduced high-temperature high-shear viscosity
First Claim
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1. A lubricating oil composition, which comprises:
- a minor portion, as a viscosity index improver, of an oil-soluble copolymer (A) having 20-70% by weight of at least one alkyl acrylate unit (a1) containing 5-22 carbon atoms in the alkyl group and 30-80% by weight of at least one alkyl methacrylate unit (a2) containing 1-22 carbon atoms in the alkyl group, and a major portion of an isoparaffin-containing high viscosity index oil (B) having a viscosity index of at least 110.
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Abstract
A viscosity index improver, comprising an oil-soluble copolymer (A) having 20-70% by weight of alkyl acrylate units and 30-80% by weight of alkyl methacrylate units, and a viscosity index improver, comprising 20-80% by weight of an oil-soluble alkyl acrylate (co)polymer (A1) and 20-80% by weight of an oil-soluble methacrylate (co)polymer (A2), are capable of reducing high-temperature high-shear viscosity, particularly isoparaffin-containing high viscosity index oil, and provide luburicating oils useful as engine oil, gear lubricant and so on.
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Citations
16 Claims
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1. A lubricating oil composition, which comprises:
a minor portion, as a viscosity index improver, of an oil-soluble copolymer (A) having 20-70% by weight of at least one alkyl acrylate unit (a1) containing 5-22 carbon atoms in the alkyl group and 30-80% by weight of at least one alkyl methacrylate unit (a2) containing 1-22 carbon atoms in the alkyl group, and a major portion of an isoparaffin-containing high viscosity index oil (B) having a viscosity index of at least 110. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A lubricating oil composition, which comprises:
a minor portion, as a viscosity index improver, of an oil-soluble copolymer (A) comprising 20-70% by weight of alkylacrylate unit (a1) whose alkyl group has 1-22 carbon atoms comprising an alkylacrylate monomer (a1-1) whose alkyl group has 5-10 carbon atoms and an alkylacrylate monomer (a1-2) whose alkyl group has 1-4 carbon atoms and 30-80% by weight of at least one alkylmethacrylate unit (a2) containing 1-22 carbon atoms in the alkyl group, and a major portion of an isoparaffin-containing high viscosity index oil (B) having a viscosity index of at least 110. - View Dependent Claims (14)
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15. A lubricating oil composition, which comprises:
a minor portion, as a viscosity index improver, of an oil-soluble copolymer (A) having 20-70% by weight of at least one alkyl acrylate unit (a1) containing 5-10 carbon atoms in the alkyl group and 30-80% by weight of at least one alkyl methacrylate unit (a2) containing 1-22 carbon atoms in the alkyl group, and a major portion of an isoparaffin containing high viscosity index oil (B) having a viscosity index of at least 110.
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16. A lubricating oil composition, which comprises:
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a minor portion, as a viscosity index improver, of an oil-soluble copolymer (A) having 20-70% by weight of at least one alkylacrylate unit (a1) containing 1-22 carbon atoms in the alkyl group and 30-80% by weight of at least alkylmethacrylate unit (a2) containing 1-22 carbon atoms in the alkyl group, and a major portion of an isoparaffin-containing high viscosity index oil (B) having a viscosity index of at least 110; wherein said unit (a1) comprises at least 60% by weight of the alkylacrylate unit (a1-1) containing 5-10 carbon atoms in the alkyl group.
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Specification