Lubricant composition and method of preparing copolymer using the same

Patent metadata

Field	Value
Publication number	US-11118129-B2
Application number	US-202016923202-A
Country	US
Kind code	B2
Filing date	Jul 8, 2020
Priority date	Jul 9, 2019
Publication date	Sep 14, 2021
Grant date	Sep 14, 2021

Abstract

A lubricant composition includes a base oil, a phenothiazine-based polymerization inhibitor, and a polymerization inhibitory accelerator including a hindered phenol-based compound and a hydroquinone-based compound. A self-polymerization in a polymerizing process is suppressed by an interaction between the polymerization inhibitor and the polymerization inhibitory accelerator. A method of preparing a copolymer using the lubricant composition is also provided.

First claim

What is claimed is:

1. A lubricant composition for producing an ethylene-carboxylic acid copolymer, comprising:
a base oil;
a phenothiazine-based polymerization inhibitor including a compound represented by Chemical Formula 1:

wherein, in Chemical Formula 1, R 1 to R 8 are each independently hydrogen, a C1 to C5 alkyl group or a C1 to C5 alkoxy group; and
a polymerization inhibitory accelerator including a hindered phenol-based compound and a hydroquinone-based compound,
wherein the hindered phenol-based compound is represented by Chemical Formula 2 and the hydroquinone-based compound is represented by Chemical Formula 3:

wherein, in Chemical Formula 2, R 9 to R 11 are each a C1-C5 alkyl group,
wherein, in Chemical Formula 3, R 12 to R 16 are each hydrogen or a C1 to C5 alkyl group.

2. The lubricant composition according to claim 1 , wherein an amount of the polymerization inhibitor is from 1 ppm to 2,000 ppm relative to a weight of the base oil.

3. The lubricant composition according to claim 2 , wherein the amount of the polymerization inhibitor is from 1 ppm to 10 ppm relative to the weight of the base oil.

4. The lubricant composition according to claim 1 , wherein the hindered phenol-based compound is butylated hydroxytoluene (BHT).

5. The lubricant composition according to claim 1 , wherein the hydroquinone-based compound is hydroquinone monomethyl ether (MeHQ).

6. The lubricant composition according to claim 1 , wherein an amount of the polymerization inhibitory accelerator is from 1 wt % to 10 wt % based on a weight of the base oil.

7. The lubricant composition according to claim 1 , further comprising a polar non-aromatic compound.

8. The lubricant composition according to claim 7 , wherein the polar non-aromatic compound includes a fatty acid-based compound.

9. The lubricant composition according to claim 7 , wherein an amount of the polar non-aromatic compound exceeds 1 wt % and is less than or equal to 10 wt %.

10. A method of preparing an ethylene-carboxylic acid copolymer, comprising:
injecting the lubricant composition according to claim 1 into a discharge unit;
discharging a first monomer that includes a carboxylic acid-based monomer via the discharge unit; and
reacting the discharged first monomer with a second monomer.

11. The method according to claim 10 , wherein the second monomer is an ethylene-based polymerizable monomer.

12. The method according to claim 10 , wherein an injection rate of the lubricant composition into the discharge unit is in a range from 25 kg/hr to 130 kg/hr.

13. The method according to claim 10 , wherein a temperature in the discharge unit is in a range from 20° C. to 120° C., and a discharge pressure from the discharge unit is in a range from 1,100 bar to 2,500 bar.

Assignees

• Sk Innovation Co Ltd
• Sk Global Chemical Co Ltd

Inventors

• Lee Ho Seong
• Kim Sun Joo
• Yang Jin Haek

Classifications

• C08K5/13

  Phenols; Phenolates · CPC title

• C08F210/02

  Ethene · CPC title

• C08L33/02

  Homopolymers or copolymers of acids; Metal or ammonium salts thereof · CPC title

• C08F220/06 Primary

  Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof · CPC title

• C10M2219/108

  Phenothiazine · CPC title