Process for preparing polymers and compositions thereof

Patent metadata

Field	Value
Publication number	US-9809780-B2
Application number	US-201313936445-A
Country	US
Kind code	B2
Filing date	Jul 8, 2013
Priority date	Oct 25, 2004
Publication date	Nov 7, 2017
Grant date	Nov 7, 2017

Abstract

The present invention provides a process for preparing a polymer, employing the steps of: (1) contacting a free radical initiator; a chain transfer agent containing a thiocarbonyl thio group and a free radical leaving group; and a radically polymerizable monomer, to form a polymer chain; and (2) contacting the polymer chain of step (1) with at least one of a polyvalent coupling agent, a polymerization inhibitor, a grafting acylating agent, an amine and an oil of lubricating viscosity. The invention further provides compositions and uses for the polymer.

First claim

What is claimed is:

1. A composition comprising an oil of lubricating viscosity and 0.1 wt % to 60 wt % a star polymer derived from at least two monomers comprising:
(a) at least 50 wt % of a mixture of C12 to C15 alkyl substituted (meth)acrylate monomers; and
(b) less than 50 wt % of an alkyl (meth)acrylate monomer containing 1 to 30 carbon atoms in the alkyl group, other than the C12 to C15 alkyl substituted (meth)acrylate monomer;
(c) containing 0 wt % styrene; and
(d) optionally containing less than 10 wt % alkyl methacrylamide, wherein the star-polymer has about 7 to about 50 arms present on the star polymer, and wherein the star polymer is prepared by a reversible addition-fragmentation chain transfer controlled radical polymerisation process.

2. The composition of claim 1 , wherein the star polymer is derived from at least two monomers consisting essentially of:
(a) at least 50 wt % of a mixture of C12 to C15 alkyl substituted (meth)acrylate monomers; and
(b) less than 50 wt % of an alkyl (meth)acrylate monomer containing 1 to 30 carbon atoms in the alkyl group, other than the C12 to C15 alkyl substituted (meth)acrylate monomer.

3. The composition of claim 1 , wherein the star polymer is derived from at least two monomers comprising:
(a) at least 50 wt % of a mixture of C12 to C15 alkyl substituted (meth)acrylate monomers; and
(b) less than 50 wt % of an alkyl (meth)acrylate monomer containing 1 to 30 carbon atoms in the alkyl group, other than the C12 to C15 alkyl substituted (meth)acrylate monomer;
(c) containing 0 wt % styrene; and
(d) containing less than 10 wt % alkyl methacrylamide.

4. The composition of claim 1 , wherein the star polymer is present from 1 wt % to 50 wt % of the composition.

5. The composition of claim 1 , wherein the star polymer is present from 2 wt % to 45 wt % of the composition.

6. The composition of claim 1 , wherein the star polymer is present from 5 wt % to 40 wt % of the composition.

7. The composition of claim 1 , wherein the star-polymer has about 10 to about 50 arms present on the star polymer.

8. The composition of claim 1 , wherein the star-polymer has about 12 to about 40 arms present on the star polymer.

9. The composition of claim 1 , wherein the oil of lubricating viscosity comprises an API Group I, II, III oil, or mixtures thereof.

10. The composition of claim 1 , wherein the oil of lubricating viscosity comprises API Group II, III, IV, V or VI oil, or mixtures thereof.

11. The composition of claim 1 , wherein the oil of lubricating viscosity comprises a gas-to-liquid oil.

12. The composition of claim 1 , wherein the oil of lubricating viscosity is present from 15 wt % to 99.9 wt % of the composition.

13. The composition of claim 1 , wherein the oil of lubricating viscosity is present from 30 wt % to 98.9 wt % of the composition.

14. The composition of claim 1 , wherein the oil of lubricating viscosity is present from 40 wt % to 97.9 wt % of the composition.

15. The composition of claim 1 , wherein the oil of lubricating viscosity is present from 50 wt % to 94.5 wt % of the composition.

16. The composition of claim 1 , wherein the composition further comprises 0.01 wt % to 20 wt % of other performance additives, and wherein the other performance additives include metal deactivators, detergents, dispersants, viscosity modifiers, friction modifiers, dispersant viscosity modifiers, extreme pressure agents, antiwear agents, antioxidant, corrosion inhibitors, foam inhibitors, demulsifiers, pour point depressants, seal swelling agents and mixtures thereof.

17. The composition of claim 1 , wherein the composition further comprises 0.1 wt % to 15 wt % of other performance additives, and wherein the other performance additives include metal deactivators, detergents, dispersants, viscosity modifiers, friction modifiers, dispersant viscosity modifiers, extreme pressure agents, antiwear agents, antioxidant, corrosion inhibitors, foam inhibitors, demulsifiers, pour point depressants, seal swelling agents and mixtures thereof.

18. The composition of claim 1 , wherein the composition further comprises 0.5 wt % to 10 wt % of other performance additives, and wherein the other performance additives include metal deactivators, detergents, dispersants, viscosity modifiers, friction modifiers, dispersant viscosity modifiers, extreme pressure agents, antiwear agents, antioxidant, corrosion inhibitors, foam inhibitors, demulsifiers, pour point depressants, seal swelling agents and mixtures thereof.

19. A composition comprising an oil of lubricating viscosity and 0.1 wt % to 60 wt % a star polymer derived from two monomers consisting of:
(a) at least 50 wt % of a mixture of C12 to C15 alkyl substituted (meth)acrylate monomers; and
(b) less than 50 wt % of an alkyl (meth)acrylate monomer containing 1 to 30 carbon atoms in the alkyl group, other than the C12 to C15 alkyl substituted (meth)acrylate monomer.

20. A composition comprising an oil of lubricating viscosity and 0.1 wt % to 60 wt % a star polymer derived from at least two monomers comprising:
(a) at least 50 wt % of a mixture of C12 to C15 alkyl substituted (meth)acrylate monomers; and
(b) less than 50 wt % of an alkyl (meth)acrylate monomer containing 1 to 30 carbon atoms in the alkyl group, other than the C12 to C15 alkyl substituted (meth)acrylate monomer;
(c) containing less than 20 wt % styrene; and
(d) optionally containing less than 10 wt % alkyl methacrylamide, wherein the star-polymer has 16 or more arms present on the star polymer, and wherein the star polymer is prepared by a reversible addition-fragmentation chain transfer controlled radical polymerisation process.

Assignees

• Lubrizol Corp

Inventors

• Baum Marina
• Schober Barton J
• Davies Mark C
• Visger Daniel C
• Johnson John R

Classifications

• C10N2030/02

  Pour-point; Viscosity index · CPC title

• C10N2040/08

  Hydraulic fluids, e.g. brake-fluids · CPC title

• C10N2030/08

  Resistance to extreme temperature · CPC title

• C10N2040/04

  Oil-bath; Gear-boxes; Automatic transmissions; Traction drives · CPC title

• C10N2040/044

  for manual transmissions · CPC title