High performance grease compositions

Patent metadata

Field	Value
Publication number	US-2023250356-A1
Application number	US-202318166531-A
Country	US
Kind code	A1
Filing date	Feb 9, 2023
Priority date	Feb 10, 2022
Publication date	Aug 10, 2023
Grant date	—

Abstract

This invention relates to overbased calcium sulfonate complex grease compositions prepared without boric acid and alcohol promotors containing anti-wear, anti-friction, thermal & oxidation stability additives.

First claim

1 . A method for making a high performance overbased calcium sulfonate complex grease composition prepared without boric acid and without the use of any alcohol-based promotors comprising reacting and mixing (a) a primary overbasing material comprising overbased oil-soluble calcium sulfonate having amorphous calcium carbonate dispersed therein; (b) a suitable base oil of an amount appropriate to provide a final acceptable product consistency; (c) in the presence of a functionalized polymer, a stoichiometric excess of finely divided calcium carbonate as an oil-insoluble solid calcium-containing base added to the primary overbasing material and base oil before conversion; and (d) a doping agent in the form of an extreme-pressure, anti-wear, antioxidant, metal deactivator or polymeric additive, or combination thereof.

2 . The method of claim 1 , further comprising the addition of a carboxylic acid between steps (c) and (d) selected from the group consisting of a long chain and short chain carboxylic acid.

3 . The method of claim 2 wherein the amount of overbased oil-soluble calcium sulfonate is between 10 and 35%.

4 . The method of claim 3 , wherein the amount of the overbased oil-soluble calcium sulfonate is between 18 and 25%.

5 . The method of claim 4 , wherein the total amount of base oil added is between 25% and 80%.

6 . The method of claim 5 , wherein the total amount of base oil added is between 35% and 75%.

7 . The method of claim 6 , wherein the total amount of base oil added is between 40% and 70%.

8 . The method of claim 5 , wherein the amount of long chain carboxylic acid is between 1% and 6%.

9 . The method of claim 8 , wherein the amount of long chain carboxylic acid is between 2.0% and 3.5%.

10 . The method of claim 8 , wherein the amount of doping agent is between 0.5 -15 %.

11 . The method of claim 10 , wherein the amount of doping agent is between 5 -12%.

12 . The composition of claim 10 wherein the resulting grease composition contains an insoluble portion of crystalline capsule morphology.

13 . The composition of claim 13 , wherein the crystalline capsule morphology has a length of about 16.4 +/-6.4 nm and a width of about 5.7 +/- 1.3 nm.

Assignees

• Chevron Usa Inc

Inventors

• Kumar Anoop

Classifications

• C10M169/00 Primary

  Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential · CPC title

• C10M115/10

  containing sulfur · CPC title

• C10M125/10

  Metal oxides, hydroxides, carbonates or bicarbonates · CPC title

• C10M129/32

  monocarboxylic · CPC title

• C10M129/44

  containing hydroxy groups · CPC title