Polyamide and functional fluid containing same
AssigneeCincinnati Milacron Inc.
InventorWalter E. Rieder
Life of this patent
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Abstract
Polyoxyalkylene polyamide lubricants having a terminal carboxylic acid group and a terminal amine group in the same molecule and a degree of polymerization of from 2 to 10 and salts thereof are provided. Stable aqueous based compositions are prepared from the polyamide or its salt, that are useful metal working and hydraulic fluids.
Claims33
A polyamide derivative of a polyoxalkylene diamine wherein said polyamide has (a) a single terminal carboxylic acid group and a single terminal amine group in the same molecule, and (b) a degree of polymerization of from 2 to 10 or the salt of the polyamide which is the salt of (c) the terminal carboxylic acid group, (d) the terminal amine group, or (e) both the terminal carboxylic acid and terminal amine groups, wherein the polyamide has the following formula ##STR4## where R is a divalent aliphatic, aromatic, arylaliphatic, alkylaromatic, cycloaliphatic, heteroaliphatic having oxygen or sulfur heterochain atoms, heterocyclic having one to two oxygen, sulfur or nitrogen hetero ring atoms and from 5 to 6 ring atoms or bicyclic radical or the halogenated derivatives of said divalent radical,
- R' is a divalent polyoxyalkylene homopolymer or copolymer radical and
- n is 2 to 10,
- said polyamide and its salts having an average molecular weight not greater than about 50,000.
An aqueous functional fluid composition comprising (a) water, and (b) a lubricant compound selected from the group consisting of a water soluble or dispersible polyamide derivative of a polyoxyalkylene diamine wherein the polyamide has a single terminal carboxylic acid group and a single terminal amine group in the same molecule and a degree of polymerization from 2 to 10, a water soluble or dispersible salt of a water soluble or dispersible polyamide derivative of a polyoxyalkylene diamine wherein the polyamide has a single terminal carboxylic acid group and a single terminal amine group in the same molecule and a degree of polymerization of from 2 to 10 or a water soluble or dispersible salt of a water insoluble polyamide derivative of a polyoxyalkylene diamine wherein the polyamide has a single terminal carboxylic acid group and a single terminal amine group in the same molecule and a degree of polymerization of from 2 to 10, wherein the polyamide derivative has the formula ##STR5## where R is a divalent aliphatic, aromatic, arylaliphatic, alkylaromatic, cycloaliphatic, heteroaliphatic having oxygen or sulfur heterochain atoms, heterocyclic having one to two oxygen, sulfur or nitrogen hetero ring atoms and 5 to 6 ring atoms or bicyclic radical or the halogenated derivative of said radical,
- R' is a divalent polyoxyalkylene homopolymer or copolymer radical and
- n is 2 to 10,
- said polyamide and water soluble or dispersible salts thereof having an average molecular weight of not greater than 50,000, the water soluble or dispersible salt being formed by the terminal carboxylic acid group, terminal amine group or both the terminal carboxylic acid and terminal amine groups of the polyamide.
Dependencies are inferred from the claim text.