Claims
- 1. A viscosity index improver, which comprises a polymer (A1) having a solubility parameter of 8.6-9.4, a crystallizing initiation temperature of −15° C. or less, and a steric hindrance factor (F) of 0-13, said factor F being defined by the following equation:
- 2. The improver of claim 1, wherein said polymer (A1) contains units of said monomer (a), said monomer (b) or said monomers (a) and (b) in an amount of at least 30% by weight, with or without 0-45% by weight of units of said monomer (c), 0-12% by weight of units of said monomer (d) and 0-20% by weight of units of another monomer.
- 3. The improver of claim 1, wherein said polymer (A1) is a polymer (A11), comprising units of at least one monomer selected from the group consisting of
a monomer (a0), represented by the general formula (2) wherein R is a branched alkyl group containing 20-40 carbon atoms, and a monomer (a1), represented by the general formula (2) wherein R is a branched alkyl group containing 16-19 carbon atoms.
- 4. The improver of claim 3, wherein said polymer (A11) comprises 5-90% by weight of units of at least one monomer selected from the group consisting of said monomers (a0) and (a1), and 10-60% by weight of units of an alkyl acrylate or methacrylate (a2) containing 1-4 carbon atoms in the alkyl group, with or without 0-85% by weight of units of at least one selected from the group consisting of an alkyl acrylate or methacrylate (a3) containing 8-15 carbon atoms in the alkyl group and a straight-chain alkyl acrylate or methacrylate (a4) containing 16-18 carbon atoms in the alkyl group.
- 5. The improver of claim 4, wherein said polymer (A11) further comprises 0.1-10% by weight of units of said monomer (d).
- 6. The improver of claim 5, wherein said monomer (d) is at least one selected from the group consisting of dimethyl-aminoethyl methacrylate, diethylaminoethyl methacrylate, morpholinoethyl methacrylate, and corresponding acrylates.
- 7. The improver of claim 1, wherein said polymer (A1) is a polymer (A12), comprising units of 27-40% by weight of an alkyl acrylate or methacrylate (a2) containing 1-4 carbon atoms in the alkyl group, 10-40% by weight of an alkyl acrylate or methacrylate (a31) containing 12-13 carbon atoms in the alkyl group, 10-40% by weight of an alkyl acrylate or methacrylate (a32) containing 14-15 carbon atoms in the alkyl group, and 5-35% by weight of an alkyl acrylate or methacrylate containing 16-40 carbon atoms in the alkyl group.
- 8. A viscosity index improver, which comprises a polymer (A0) having a weight-average molecular weight of 5,000-2,000,000, comprising 5-95% by weight of units of at least one monomer (a0) and 5-95% by weight of units of at least one alkyl acrylate or methacrylate other than said monomer (a0); said monomer (a0) being capable of providing a homopolymer having a crystallizing initiation temperature of 5° C. or less and represented by the general formula:
- 9. The improver of claim 8, wherein said branched alkyl group is represented by the general formula:
- 10. The improver of claim 8, wherein said polymer (A0) has a solubility parameter of 8.6-9.4, a crystallizing initiation temperature of −15° C. or less, and a steric hindrance factor F of 0-13, said factor being defined by the following equation:
- 11. The improver of claim 8, wherein said polymer (A0) has a steric hindrance factor F of 0-10.
- 12. The improver of claim 8, wherein said polymer (A0) comprises 5-90% by weight of units of said monomer (a0), and 10-60% by weight of units of an alkyl acrylate or methacrylate (a2) containing 1-4 carbon atoms in the alkyl group, with or without 0-85% by weight of units of at least one selected from the group consisting of an alkyl acrylate or methacrylate (a3) containing 8-15 carbon atoms in the alkyl group, a branched alkyl acrylate or methacrylate (a12) containing 16-19 carbon atoms in the alkyl group, a straight-chain alkyl acrylate or methacrylate (a4) containing 16-18 carbon atoms in the alkyl group and a straight-chain alkyl acrylate or methacrylate (a5) containing 20-40 carbon atoms in the alkyl group.
- 13. The improver of claim 8, wherein said polymer (A0) comprises 10-45% by weight of units of 2-decyl-tetradecyl methacrylate, 20-45% by weight of units of methyl methacrylate, and 10-60% by weight of units of a straight-chain alkyl acrylate or methacrylate containing 10-18 carbon atoms in the alkyl group.
- 14. The improver of claim 8, wherein said polymer (A0) further comprises 0.1-10% by weight of units of a nitrogen-containing unsaturated monomer (d).
- 15. The improver of claim 14, wherein said monomer (d) is at least one selected from the group consisting of dimethyl-aminoethyl methacrylate, diethylaminoethyl methacrylate, morpholinoethyl methacrylate, and corresponding acrylates.
- 16. A viscosity improver concentrate, which comprises 10-90% by weight of said improver of claim 1 and 10-90% by weight of a diluent.
- 17. A viscosity improver concentrate, which comprises 10-90% by weight of said improver of claim 7 and 10-90% by weight of a diluent.
- 18. A lube oil composition, which comprises a major amount of a base oil and 0.5-30% by weight of said improver of claim 1.
- 19. The composition of claim 18, wherein the base oil has a kinematic viscosity of 1-15 mm2/s at 100° C. and a viscosity index of at least 80.
- 20. A lube oil composition, which comprises a major amount of a base oil and 0.5-30% by weight of said improver of claim 8.
- 21. The composition of claim 20, wherein the base oil has a kinematic viscosity of 1-15 mm2/s at 100° C. and a viscosity index of at least 80.
- 22. A compound of 2-decyl-tetradecyl methacrylate.
- 23. A compound of 2-decyl-tetradecyl acrylate.
- 24. A polymer having a weight-average molecular weight of 5,000-2,000,000, comprising units of a compound selected from the group consisting of a compound of 2-decyl-tetradecyl methacrylate and a compound of 2-decyl-tetradecyl acrylate.
- 25. The polymer of claim 24, which comprises 5-95% by weight of units of the compound of 2-decyl-tetradecyl methacrylate, and 5-95% by weight of units of at least one monomer selecting from the group consisting of: another alkyl methacrylate or an alkyl acrylate; an alkyl alkenyl ether; an alkenyl carboxylate; and a nitrogen-containing unsaturated monomer.
Priority Claims (1)
Number |
Date |
Country |
Kind |
JP2001-109164 |
Apr 2001 |
JP |
|
Parent Case Info
[0001] This application is a continuation-in-part of Application Ser. No. 10/114,283, filed Apr. 3, 2002.
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
10114283 |
Apr 2002 |
US |
Child |
10212784 |
Aug 2002 |
US |