Viscosity Index Improver Concentrates

Patent metadata

Field	Value
Publication number	US-2017166830-A1
Application number	US-201514963477-A
Country	US
Kind code	A1
Filing date	Dec 9, 2015
Priority date	Dec 9, 2015
Publication date	Jun 15, 2017
Grant date	—

Abstract

A viscosity index improver containing, in diluent oil, one or more optionally functionalized linear block copolymers having at least one block derived from alkenyl arene covalently linked to at least one block derived from diene in an amount that is greater than the critical overlap concentration (c h *), in mass %, for the linear block copolymers in the diluent oil; and ester base stock and/or at least one star (or radial) polymer, the star polymer being present in an amount such that the c/c h * value of the star polymer in the concentrate falls within the range of from 0.01 to about 1.6, wherein c is the concentration in mass % of star polymer in the concentrate and c h * is the critical overlap concentration in mass % for the star polymer in the diluent oil used to form the concentrate.

First claim

What is claimed is:

1 . A viscosity index improver concentrate comprising, in diluent oil, one or more linear block copolymers having at least one block derived from alkenyl arene covalently linked to at least one block derived from diene in an amount that is greater than the critical overlap concentration (c h *), in mass %, for the linear block copolymers in said diluent oil; and at least one star polymer, said star polymer being present in an amount such that the c/c h * value of the star polymer in the concentrate falls within the range of from 0.01 to about 1.6, wherein c is the concentration in mass % of star polymer in said concentrate and c h * is the critical overlap concentration in mass % for the star polymer in said diluent oil.

2 . A VI improver concentrate of claim 1 , wherein the diene blocks and/or alkenyl arene blocks of said linear block copolymers are functionalized to have pendant ester, amine, imide or amide functional groups.

3 . A VI improver concentrate of claim 1 , further comprising greater than 1 mass %, based on the total mass of the concentrate, of ester base stock.

4 . A VI improver concentrate of claim 3 , comprising from about 5 mass % to about 60 mass %, based on the total mass of the concentrate, of ester base stock.

5 . A VI improver concentrate of claim 2 , further comprising greater than 1 mass %, based on the total mass of the concentrate, of ester base stock.

6 . A VI improver concentrate of claim 5 , comprising from about 5 mass % to about 60 mass %, based on the total mass of the concentrate, of ester base stock.

7 . A VI improver concentrate of claim 1 , consisting essentially of diluent oil, one or more linear block copolymers having at least one block derived from alkenyl arene covalently linked to at least one block derived from diene; at least one star polymer; and optionally, ester base stock.

8 . A VI improver concentrate of claim 2 , consisting essentially of diluent oil, one or more linear block copolymers having at least one block derived from alkenyl arene covalently linked to at least one block derived from diene wherein the diene blocks and/or alkenyl arene blocks of said linear block copolymers are functionalized to have pendant ester, amine, imide or amide functional groups; at least one star polymer; and optionally, ester base stock.

9 . A VI concentrate of claim 1 , wherein the concentrate has a kinematic viscosity at 100° C. (kv 100 ) of from about 300 to about 3000 cSt.

10 . A VI concentrate of claim 2 , wherein the concentrate has a kinematic viscosity at 100° C. (kv 100 ) of from about 300 to about 3000 cSt.

11 . A method of increasing the amount of one or more linear block copolymer having at least one block derived from alkenyl arene covalently linked to at least one block derived from diene that can be dissolved in diluent oil in the formation of a VI improver concentrate to an amount greater than the critical overlap concentration (c h *), in mass %, for the linear block copolymers in said diluent oil, without raising the kinematic viscosity at 100° C. (kv 100 ) of the VI improver concentrate above about 3000 cSt, which method comprises adding to said concentrate at least one star polymer, said star polymer being added in an amount such that the c/c h * value of the star polymer in the concentrate falls within the range of from 0.01 to about 1.6, wherein c is the concentration in mass % of star polymer in the concentrate and c h * is the critical overlap concentration in mass % for the star polymer in said diluent oil.

12 . The method of claim 11 , wherein the diene blocks and/or alkenyl arene blocks of said linear block copolymers are functionalized to have pendant ester, amine, imide or amide functional groups.

13 . The method of claim 11 , comprising the additional step of adding to said VI improver concentrate greater than 1 mass %, based on the total mass of the concentrate, of ester base stock.

14 . The method of claim 13 , wherein from about 5 mass % to about 60 mass %, based on the total mass of the concentrate, of ester base stock is added.

15 . The method of claim 12 , comprising the additional step of adding to said VI improver concentrate greater than 1 mass %, based on the total mass of the concentrate, of ester base stock.

16 . The method of claim 15 , wherein from about 5 mass % to about 60 mass %, based on the total mass of the concentrate, of ester base stock is added.

17 . A viscosity index improver (VI) concentrate comprising, in diluent oil, an amount of one or more linear block copolymers having at least one block derived from alkenyl arene, covalently linked to at least one block derived from diene, wherein the diene blocks and/or alkenyl arene blocks of at least one of said linear block copolymers are functionalized to have pendant ester, amine, imide or amide functional groups, which amount is greater than the critical overlap concentration (c h *), in mass %, for the linear block copolymers in said diluent oil; and greater than 1 mass %, based on the total mass of the concentrate, of ester base stock.

18 . A VI improver concentrate of claim 17 , comprising from about 5 mass % to about 60 mass %, based on the total mass of the concentrate, of ester base stock.

19 . A VI improver concentrate of claim 18 consisting essentially of the functionalized polymer, diluent oil and ester base stock.

20 . A method of increasing the amount of one or more linear block copolymer having at least one block derived from alkenyl arene covalently linked to at least one block derived from diene, wherein the diene blocks and/or alkenyl arene blocks of at least one of said linear block copolymers are functionalized to have pendant ester, amine, imide or amide functional groups, that can be dissolved in diluent oil in the formation of a VI improver concentrate to greater than the critical overlap concentration (c h *), in mass %, for the linear block copolymers in said diluent oil, without raising the kinematic viscosity at 100° C. (kv 100 ) of the VI improver concentrate above about 3000 cSt, which method comprises adding to said concentrate greater than 1 mass, based on the total mass of the concentrate, of ester base stock.

21 . The method of claim 20 , wherein from about 5 mass % to about 60 mass %, based on the total mass of the concentrate, of ester base stock is added.

Assignees

• Infineum Int Ltd

Inventors

• Taribagil Rajiv R
• Taylor Stuart A
• Briggs Stuart
• Chambard Laurent

Classifications

• C10M2205/04

  containing aromatic monomers, e.g. styrene · CPC title

• C10M2207/2835

  used as base material · CPC title

• C10M2217/06

  Macromolecular compounds obtained by functionalisation op polymers with a nitrogen containing compound · CPC title

• C10M157/04 Primary

  at least one of them being a nitrogen-containing compound · CPC title

• C10M2203/0206

  used as base material · CPC title