Rotary screw compressor lubricants
AssigneeThe Dow Chemical Company
InventorsRobert Carswell, Philip W. McGraw
Life of this patent
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Abstract
Synthetic lubricants comprising 15 to 45 weight percent of an ester of a hindered polyhydric alcohol having 3 to 8 hydroxy groups and 5 to 10 carbon atoms with one or more alkanoic acids having 4 to 18 carbon atoms blended with 85 to 55 weight percent of one or more polyether polyol having an number average molecular weight from about 400 to 5000. The blends are compounded with antioxidants, corrosion inhibitors, and metal deactivators to produce a superior lubricant for rotary screw compressors that has a long life.
Claims20
A lubricant composition comprising,
- (A) about 15 to 45 weight percent of an ester of a hindered polyhydric alcohol having 3 to 8 hydroxyl groups with one or more alkanoic acids having 4 to 18 carbon atoms, and
- (B) about 85 to 55 weight percent of one or more polyether polyol compounds which have a flash point greater than 375.degree. F. and which have the formula ##STR2## where Z is the residue of a non-amine initiator compound having 1-8 active hydrogens,
- R.sup.1 is hydrogen or methyl when R.sup.2 is methyl,
- R.sup.2 is hydrogen, methyl, or ethyl when R.sup.1 is hydrogen,
- n is a number having an average value which will give a molecular weight range from about 400 to about 5000,
- m is an integer having a value of from 1 to about 8,
- R.sup.3 is hydrogen or an alkyl group of 1 to 6 carbon atoms.
A lubricant composition comprising,
- (A) about 15 to 45 weight percent of an ester of a hindered polyhydric alcohol having 3 to 8 hydroxyl groups with one or more alkanoic acids having 4 to 18 carbon atoms, and
- (B) about 85 to 55 weight percent of one or more polyoxyalkylene glycols having a flash point greater than 375.degree. F. and having a number average molecular weight range from about 400 to 5000 and mixtures thereof.
A lubricant composition comprising,
- (A) about 15 to 45 weight percent of an ester of pentaerythritol with one or more alkanoic acids having 4 to 18 carbon atoms, and
- (B) about 85 to 55 weight percent of one or more polyoxyalkylene glycols having a flash point greater than 375.degree. F. and having a number average molecular weight range from about 700 to 2500 and mixtures thereof.
Dependencies are inferred from the claim text.