US5370812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lubricant compositions for refrigerators comprising polyalkylene glycol and a hydrocarbon solvent
Assignee: Union Carbide Chemicals and Plastics Technology LLC
•
Filing: 1993-06-28
•
Granted: 1994-12-06
•
Expires: 2013-06-28
Abstract
Abstract Lubricant compositions are disclosed which comprise polyalkylene glycols and hydrocarbon solvents having 15 or less carbon atoms per molecule. The polyalkylene glycols are soluble in fluorocarbon-based refrigerants, such as for example, HFC-134a, and the hydrocarbon solvents are soluble in the polyalkylene glycols. Thus, the lubricant compositions are particularly well suited as lubricants in refrigeration systems, such as for example, automobile air conditioners, which contain fluorocarbon-based refrigerants. Refrigerant/lubricant compositions comprising refrigerants and the lubricant compositions are also disclosed.
Inventors
- 👤 William L. Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:33
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/04; C09K5/041; C09K5/044; C09K5/045; C10; C10M; C10M105/00; C10M105/02; C10M105/04; C10M107/00; C10M107/20; C10M107/30; C10M107/32; C10M107/34; C10M111/00; C10M111/04; C10M127/00; C10M127/02; C10M169/00; C10M169/04; C10M171/00; C10M171/008; C09K2205/00; C09K2205/24; C10M2203/00; C10M2203/02; C10M2203/022; C10M2203/024; C10M2203/04; C10M2203/045; 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; C10M2211/00; C10M2211/02; C10M2211/022; C10M2211/06; C10N; C10N2040/00; C10N2040/30; C10N2040/32; C10N2040/34; C10N2040/36; C10N2040/38; C10N2040/40; C10N2040/42; C10N2040/44; C10N2040/50
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
116 words
A refrigerant/lubricant composition comprising (I) a refrigerant comprising at least one of tetrafluoroethane and pentafluoroethane; and (II) a lubricant comprising: a) from about 50 to 99.9 wt. % of the lubricant of a polyalkylene glycol comprising at least one of oxyethylene units and oxypropylene units, said polyalkylene glycol; (i) having less than 10 wt % of oxyalkylene units having four or more carbon atoms based on the weight of the polyalkylene glycol; and (ii) being soluble at 70° F. in refrigerant HFC-134a; and b ) from about 0.1 to 50 wt % of the lubricant of a hydrocarbon solvent having 15 or less carbon atoms per molecule, said hydrocarbon solvent being soluble in said polyalkylene glycol.
Claim 2
Dependent Claim
116 words
A refrigerant/lubricant composition comprising (I) a refrigerant comprising at least one of tetrafluoroethane and pentafluoroethane; and (II) a lubricant comprising: a) from about 50 to 99.9 wt. % of the lubricant of a polyalkylene glycol comprising at least one of oxyethylene units and oxypropylene units, said polyalkylene glycol; (i) having less than 10 wt % of oxyalkylene units having four or more carbon atoms based on the weight of the polyalkylene glycol; and (ii) being soluble at 70° F. in refrigerant HFC-134a; and b ) from about 0.1 to 50 wt % of the lubricant of a hydrocarbon solvent having 15 or less carbon atoms per molecule, said hydrocarbon solvent being soluble in said polyalkylene glycol.
Claim 3
Dependent Claim
36 words
The refrigerant/lubricant composition of claim 1 comprising from about 50 to 99 wt % of the refrigerant and from about 1 to 50 wt % of the lubricant based on the weight of the refrigerant/lubricant composition.
Claim 4
Dependent Claim
26 words
The composition of claim 2 wherein the polyalkylene glycol comprises less than 80 wt % of oxyethylene units based on the weight of the polyalkylene glycol.
Claim 5
Dependent Claim
28 words
The composition of claim 3 wherein the polyalkylene glycol comprises from about 1 to 75 wt % of oxyethylene units based on the weight of the polyalkylene glycol.
Claim 6
Dependent Claim
28 words
The composition of claim 2 wherein the polyalkylene glycol comprises from about 40 to 100 wt % of oxypropylene units based on the weight of the polyalkylene glycol.
Claim 7
Dependent Claim
31 words
The composition of claim 2 wherein the sum of the concentrations of oxyethylene units and oxypropylene units is at least 90 wt % based on the weight of the polyalkylene glycol.
Claim 8
Dependent Claim
31 words
The composition of claim 2 wherein the polyalkylene glycol comprises less than 1 wt % oxyalkylene units having four or more carbon atoms based on the weight of the polyalkylene glycol.
Claim 9
Dependent Claim
18 words
The composition of claim 2 wherein the hydrocarbon solvent comprises from 10 to 15 carbon atoms per molecule.
Claim 10
Dependent Claim
18 words
The composition of claim 8 wherein the hydrocarbon solvent comprises at least one of isoparaffins and normal paraffins.
Claim 11
Dependent Claim
25 words
The composition of claim 2 comprising from about 1 to 10 wt % of the hydrocarbon solvent based on the weight of the lubricant composition.
Claim 12
Dependent Claim
22 words
The composition of claim 2 wherein the viscosity of the polyalkylene glycol is from about 100 to 750 SUS at 100° F.
References Cited (Backward Citations)
US2813129A
Cited
US3871837A
Cited
US4248726A
Cited
US4267064A
Cited
US4302349A
Cited
US4370247A
Cited
US4493776A
Cited
US4555549A
Cited
US4617984A
Cited
US4751012A
Cited
US4793939A
Cited
US4755316A
Cited
US4916914A
Cited
US5027606A
Cited
US5143640A
Cited
US5254280A
Cited
US4851144A
Cited
US4900463A
Cited
US4971712A
Cited
US5152926A
Cited
US5053155A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-12-05 | 1998-06-06 | 1998-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-05 | 2002-06-06 | 2002-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-05 | 2006-06-06 | 2006-12-06 | $7700.00 | Window Closed / Lapsed |