US4751012A
Expired / Lapsed
US
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Lubricants for reciprocating air compressors
Assignee: Dow Chemical Co
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Filing: 1986-11-04
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Granted: 1988-06-14
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Expires: 2006-11-04
Abstract
Abstract Synthetic lubricants comprising 15 to 45 weight percent of an ester of a monohydric alcohol of 4 to 18 carbon atoms with one or more aromatic or alkane dicarboxylic acids having 4 to 18 carbon atoms blended with 85 to 55 weight percent of one or more polyether polyols having a 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 reciprocating air compressors which gives a long life to the compressors.
Inventors
- 👤 Eldon L. Ward
- 👤 Philip W. McGraw
- 👤 Thomas J. Appleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:27
CPC Classifications
C; C10; C10M; C10M111/00; C10M111/04; C10M105/00; C10M105/08; C10M105/32; C10M105/36; C10M107/00; C10M107/20; C10M107/30; C10M107/32; C10M107/34; C10M171/00; C10M171/008; C10M2207/00; C10M2207/02; C10M2207/023; C10M2207/026; C10M2207/28; C10M2207/282; C10M2207/2825; C10M2207/285; C10M2207/2855; C10M2207/34; C10M2209/00; C10M2209/10; C10M2209/103; C10M2209/1033; C10M2209/104; C10M2209/1045; C10M2209/105; C10M2209/1055; C10M2209/106; C10M2209/1065; C10M2209/107; C10M2209/1075; C10M2209/108; C10M2209/1085; C10M2209/109; C10M2209/1095; C10M2215/00; C10M2215/02; C10M2215/06; C10M2215/064; C10M2215/065; C10M2215/22; C10M2215/221; C10M2215/223; C10M2215/224; C10M2215/225; C10M2215/226; C10M2215/24; C10M2215/30; C10M2219/00; C10M2219/04; C10M2219/044; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/043; C10N; C10N2020/00; C10N2020/01; C10N2040/00; C10N2040/06; C10N2040/30; C10N2040/32; C10N2040/34; C10N2040/36; C10N2040/38; C10N2040/40; C10N2040/42; C10N2040/44; C10N2040/50
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
148 words
A lubricant composition comprising, (A) about 15 to 45 weight percent of an ester of a monohydric alcohol having 4 to 18 carbon atoms with one or more aromatic or alkane dicarboxylic acids having 4 to 18 carbon atoms, and (B) about 85 to 55 weight percent of one or more polyether polyols which have a flash point greater than 375° F. (191° C.) and which have the formula ##STR2## where Z is the residue of a compound having 1-8 hydroxyl groups, R 1 is an alkylene radical having 2 to 4 carbon atoms, n is a number having an average value which will give a number average molecular weight range from about 400 to about 5000 for the final compound, m is an integer having a value of from 1 to about 8, R 2 is hydrogen or an alkyl group of 1 to 6 carbon atoms.
Claim 2
Dependent Claim
148 words
A lubricant composition comprising, (A) about 15 to 45 weight percent of an ester of a monohydric alcohol having 4 to 18 carbon atoms with one or more aromatic or alkane dicarboxylic acids having 4 to 18 carbon atoms, and (B) about 85 to 55 weight percent of one or more polyether polyols which have a flash point greater than 375° F. (191° C.) and which have the formula ##STR2## where Z is the residue of a compound having 1-8 hydroxyl groups, R 1 is an alkylene radical having 2 to 4 carbon atoms, n is a number having an average value which will give a number average molecular weight range from about 400 to about 5000 for the final compound, m is an integer having a value of from 1 to about 8, R 2 is hydrogen or an alkyl group of 1 to 6 carbon atoms.
Claim 3
Dependent Claim
30 words
The lubricant composition of claim 1 wherein the weight percent of said ester ranges from 15 to 25 and the weight percent of said polyol ranges from 75 to 85.
Claim 4
Dependent Claim
73 words
A lubricant composition comprising, (A) about 15 to 45 weight percent of an ester of a monohydric alcohol having 4 to 18 carbon atoms with one or more alkandioic 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° F. (191° C.) and having a number average molecular weight range from about 400 to 5000.
Claim 5
Dependent Claim
73 words
A lubricant composition comprising, (A) about 15 to 45 weight percent of an ester of a monohydric alcohol having 4 to 18 carbon atoms with one or more alkandioic 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° F. (191° C.) and having a number average molecular weight range from about 400 to 5000.
Claim 6
Dependent Claim
12 words
The lubricant composition of claim 3 wherein said polyoxyalkylene glycols are homopolymers.
Claim 7
Dependent Claim
13 words
The lubricant composition of claim 3 wherein said polyoxyalkylene glycols are random copolymers.
Claim 8
Dependent Claim
13 words
The lubricant composition of claim 3 wherein said polyoxyalkylene glycols are block copolymers.
Claim 9
Dependent Claim
60 words
A lubricant composition comprising, (A) about 15 to 45 weight percent of an ester of a monohydric alcohol with one or more aromatic dicarboxylic acids, and (B) about 85 to 55 weight percent of one or more polyoxyalkylene glycols having a flash point greater than 375° F. and having a number average molecular weight range from about 700 to 2500.
Claim 10
Dependent Claim
60 words
A lubricant composition comprising, (A) about 15 to 45 weight percent of an ester of a monohydric alcohol with one or more aromatic dicarboxylic acids, and (B) about 85 to 55 weight percent of one or more polyoxyalkylene glycols having a flash point greater than 375° F. and having a number average molecular weight range from about 700 to 2500.
Claim 11
Dependent Claim
30 words
The lubricant composition of claim 7 wherein the weight percent of the ester ranges from 15 to 25 and the weight percent of the polyglycol ranges from 85 to 75.
Claim 12
Dependent Claim
20 words
The lubricant composition of claim 8 wherein the glycol is polypropylene glycol having a number average molecular weight of 1200.
Claim 13
Dependent Claim
22 words
The lubricant composition of claim 9 which comprises 20 weight percent of said ester and 80 weight percent of said polypropylene glycol.
Claim 14
Dependent Claim
35 words
The composition of claim 1 which contains in addition (A) an effective amount of an antioxidant, (B) an effective amount of an ashless metal corrosion inhibitor, and (C) an effective amount of a cuprous deactivator.
Claim 15
Dependent Claim
47 words
The composition of claim 1 which contains in addition (A) about 0.1 to 5.0 weight percent of an aromatic amine antioxidant, (B) about 0.1 to 2.0 weight percent of a ashless metal corrosion inhibitor, and (C) about 0.001 to 0.5 weight percent of a cuprous metal deactivator.
Claim 16
Dependent Claim
33 words
The composition of claim 12 wherein said aromatic amine antioxidant is p,p'-dioctyl diphenyl amine, said ashless corrosion inhibitor is an amine salt of phosphoric acid monoester, and said cuprous metal deactivator is tolutriazole.
Claim 17
Dependent Claim
34 words
A method of lubricating a reciprocating air compressor wherein said compressor is continuously run for long time intervals without downtime for valve maintenance which comprises using as the lubricant the composition of claim 11.
Claim 18
Dependent Claim
34 words
A method of lubricating a reciprocating air compressor wherein said compressor is continuously run for long time intervals without downtime for valve maintenance which comprises using as the lubricant the composition of claim 12.
Claim 19
Dependent Claim
34 words
A method of lubricating a reciprocating air compressor wherein said compressor is continuously run for long time intervals without downtime for valve maintenance which comprises using as the lubricant the composition of claim 13.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-14 | 1991-12-14 | 1992-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-14 | 1995-12-14 | 1996-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-14 | 1999-12-14 | 2000-06-14 | $7700.00 | Window Closed / Lapsed |