Overbased metal carboxylate complex grease and process for making
AssigneeOMG Americas, Inc.
InventorsRuiming Zhang, Joshua I. Ford, Mary E. Hopkins
Life of this patent
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Abstract
Complex greases of overbased alkaline earth metal carboxylates are prepared by reacting an overbased alkaline earth metal salt of a fatty acid, wherein the alkaline earth metal salt has an alkaline earth metal content of at least 14.5% and a non-volatile matter content of at least 95% with conversion agents to form a grease precursor. The grease precursor is then reacted with complexing agents to form a predominantly vaterite containing non-Newtonian modified overbased metal carboxylate complex grease.
Claims22
An overbased metal carboxylate complex grease comprising:
- an overbased alkaline earth metal salt of a fatty acid, wherein the alkaline earth metal salt has an alkaline earth metal content of at least 14.5% and a non-volatile matter content of at least 95%;
- conversion agents comprising:
- a hydrocarbon liquid;
- water;
- lime;
- a polyol;
- and
- a short chain carboxylic acid selected from the group consisting of acetic acid and propionic acid;
- and
- at least one complexing agent selected from the group consisting of phosphoric acid, boric acid, a C12-C24 aliphatic monocarboxylic acid and a C12-C24 fatty acid.
A method of preparing a complex grease, the method comprising the steps of:
- providing a overbased alkaline earth metal salt of a fatty acid, wherein the alkaline earth metal salt has an alkaline earth metal content of at least 14.5% and a non-volatile matter content of at least 95%;
- reacting the overbased alkaline earth metal salt of a fatty acid with conversion agents to form a Newtonian grease precursor, wherein the conversion agents comprise:
- a hydrocarbon liquid;
- water;
- lime;
- a polyol;
- and
- a short chain carboxylic acid selected from the group consisting of acetic acid and propionic acid;
- and
- reacting the Newtonian grease precursor with at least one complexing agent to form a non-Newtonian complex grease, wherein the at least one complexing agent is selected from the group consisting of phosphoric acid, boric acid, a C12-C24 aliphatic monocarboxylic acid and a C12-C24 fatty acid.
A method of preparing a complex grease, the method comprising the steps of:
- providing a overbased alkaline earth metal salt of a fatty acid, wherein the alkaline earth metal salt has an alkaline earth metal content of at least 14.5% and a non-volatile matter content of at least 95%;
- reacting the overbased alkaline earth metal salt of a fatty acid with conversion agents to form a thixotropic, non-Newtonian gelled grease precursor, wherein the conversion agents comprise:
- a hydrocarbon liquid;
- water;
- lime;
- a polyol;
- and
- a short chain carboxylic acid selected from the group consisting of acetic acid and propionic acid;
- and
- reacting the non-Newtonian grease precursor with at least one complexing agent to form a non-Newtonian complex grease, wherein the at least one complexing agent is selected from the group consisting of phosphoric acid, boric acid, a C12-C24 aliphatic monocarboxylic acid and a C12-C24 fatty acid.
Dependencies are inferred from the claim text.