US4931199A
Expired / Lapsed
US
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Use of chlorofluoropolyethers as lubricants for refrigerants
Assignee: Exfluor Research Corp
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Filing: 1989-05-23
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Granted: 1990-06-05
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Expires: 2009-05-23
Abstract
Abstract This invention pertains to the use of chlorofluoropolyethers, such as perfluoropolyepichlorohydrin as lubricants for cooling systems which employ hydrofluorocarbon refrigerants, such as 1,1,1,2-tetrafluoroethane.
Inventors
- 👤 Thomas R. Bierschenk
- 👤 Timothy J. Juhlke
- 👤 Richard J. Lagow
- 👤 Hajimu Kawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:50
CPC Classifications
C; C09; C09K; C09K5/00; C09K5/02; C09K5/04; C09K5/041; C09K5/044; C09K5/045; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/22; C08G65/223; C08G65/226; C08G65/32; C08G65/321; C08G65/323; C08G65/3233; C08G65/3236; C10; C10M; C10M107/00; C10M107/38; C10M171/00; C10M171/008; C09K2205/00; C09K2205/24; C10M2211/00; C10M2211/02; C10M2211/022; C10M2211/06; C10M2213/00; C10M2213/04; C10M2213/06; 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: 20
Claim 1
Independent Claim
142 words
A composition, comprising: (a) hydrofluorocarbon refrigerant; and (b) an amount of chlorofluoropolyether lubricant sufficient to impart desired lubricity thereto, wherein the chlorofluoropolyether lubricant has a molecular weight of from about 1000 to about 5000 amu, a viscosity of about zero to about 200 centistokes at 40° C., a viscosity index of at least 20 and miscible in the refrigerant at from about -18° C. to about 100° C.; wherein the chlorofluoropolyether has an average formula: ##STR14## wherein X is selected from the group consisting of --CF 3 , --C 2 F 5 and --CF 2 OCF 3 ; wherein n is an integer from 1 to 50; wherein R is selected from the group consisting of --F, --CF 2 Cl, --CFCl 2 , CCL 3 and perfluoroalkyl of one to ten carbons; and wherein the chlorofluoropolyether has at least two chlorine atoms.
Claim 2
Dependent Claim
142 words
A composition, comprising: (a) hydrofluorocarbon refrigerant; and (b) an amount of chlorofluoropolyether lubricant sufficient to impart desired lubricity thereto, wherein the chlorofluoropolyether lubricant has a molecular weight of from about 1000 to about 5000 amu, a viscosity of about zero to about 200 centistokes at 40° C., a viscosity index of at least 20 and miscible in the refrigerant at from about -18° C. to about 100° C.; wherein the chlorofluoropolyether has an average formula: ##STR14## wherein X is selected from the group consisting of --CF 3 , --C 2 F 5 and --CF 2 OCF 3 ; wherein n is an integer from 1 to 50; wherein R is selected from the group consisting of --F, --CF 2 Cl, --CFCl 2 , CCL 3 and perfluoroalkyl of one to ten carbons; and wherein the chlorofluoropolyether has at least two chlorine atoms.
Claim 3
Dependent Claim
142 words
A composition, comprising: (a) hydrofluorocarbon refrigerant; and (b) an amount of chlorofluoropolyether lubricant sufficient to impart desired lubricity thereto, wherein the chlorofluoropolyether lubricant has a molecular weight of from about 1000 to about 5000 amu, a viscosity of about zero to about 200 centistokes at 40° C., a viscosity index of at least 20 and miscible in the refrigerant at from about -18° C. to about 100° C.; wherein the chlorofluoropolyether has an average formula: ##STR15## wherein X is selected from the group consisting of --CF 3 , --C 2 F 5 and --CF 2 OCF 3 ; wherein n is an integer from 1 to 50; wherein R is selected from the group consisting of --F, --CF 2 Cl, --CFCl 2 , CCl 3 and perfluoroalkyl of one to ten carbons; and wherein the chlorofluoropolyether has at least two chlorine atoms.
Claim 4
Dependent Claim
142 words
A composition, comprising: (a) hydrofluorocarbon refrigerant; and (b) an amount of chlorofluoropolyether lubricant sufficient to impart desired lubricity thereto, wherein the chlorofluoropolyether lubricant has a molecular weight of from about 1000 to about 5000 amu, a viscosity of about zero to about 200 centistokes at 40° C., a viscosity index of at least 20 and miscible in the refrigerant at from about -18° C. to about 100° C.; wherein the chlorofluoropolyether has an average formula: ##STR15## wherein X is selected from the group consisting of --CF 3 , --C 2 F 5 and --CF 2 OCF 3 ; wherein n is an integer from 1 to 50; wherein R is selected from the group consisting of --F, --CF 2 Cl, --CFCl 2 , CCl 3 and perfluoroalkyl of one to ten carbons; and wherein the chlorofluoropolyether has at least two chlorine atoms.
Claim 5
Dependent Claim
24 words
A composition of claim 2, wherein the refrigerant is selected from the group consisting of hydrofluorocarbon, tetrafluoroethane, chlorofluorocarbon, dichlorodifluoromethane, 1,1-difluoroethane, 1-chloro-1,1,1-tetrafluoroethane and mixtures thereof.
Claim 6
Dependent Claim
11 words
A composition of claim 3, wherein the hydrofluorocarbon refrigerant is tetrafluoroethane.
Claim 7
Dependent Claim
10 words
A composition of claim 4, wherein the tetrafluoroethane is 1,1,1,2-tetrafluoroethane.
Claim 8
Dependent Claim
9 words
A composition of claim 2, further comprising dichlorodifluoromethane refrigerant.
Claim 9
Dependent Claim
19 words
A composition of claim 2, wherein the chlorofluoropolyether lubricant comprises a mixture of one or more different chlorofluoropolyether lubricants.
Claim 10
Dependent Claim
22 words
A composition of claim 2, having a weight ratio of hydrofluorocarbon refrigerant to chlorofluoropolyether lubricant is from about 1:20 to about 20:1.
Claim 11
Dependent Claim
22 words
A composition of claim 8, wherein the weight ratio of hydrofluorocarbon refrigerant to chlorofluoropolyether lubricant is from about 1:5 to about 5:1.
Claim 12
Dependent Claim
56 words
The composition of claim 2, further comprising: (c) additive to enhance the performance of the composition selected from the group consisting of (1) extreme pressure and antiwear additives, (2) oxidation and thermal stability improvers, (3) corrosion inhibitors, (4) viscosity index improvers, (5) pour and floc point depressants, (6) detergents, (7) antifoaming agents and (8) viscosity adjusters.
Claim 13
Dependent Claim
24 words
A composition of claim 9 wherein the refrigerant is selected from the group consisting of hydrofluorocarbon, tetrafluoroethane, chlorofluorocarbon, dichlorodifluoromethane, 1,1difluoroethane, 1chloro-1,1,1-tetrafluoroethane and mixtures thereof.
Claim 14
Dependent Claim
11 words
A composition of claim 11 wherein the hydrofluorocarbon refrigerant is tetrafluoroethane.
Claim 15
Dependent Claim
10 words
A composition of claim 12 wherein the tetrafluoroethane is 1,1,1,2-tetrafluoroethane.
Claim 16
Dependent Claim
9 words
A composition of claim 1 further comprising dichlorodifluoromethane refrigerant.
Claim 17
Dependent Claim
19 words
A composition of claim 1 wherein the chlorofluoropolyether lubricant comprises a mixture of one or more different chlorofluoropolyether lubricants.
Claim 18
Dependent Claim
22 words
A composition of claim 1 having a weight ratio of hydrofluorocarbon refrigerant to chlorofluoropolyether lubricant is from about 1:20 to about 20:1.
Claim 19
Dependent Claim
22 words
A composition of claim 16 wherein the weight ratio of hydrofluorocarbon refrigerant to chlorofluoropolyether lubricant is from about 1:5 to about 5:1.
Claim 20
Dependent Claim
56 words
The composition of claim 1 further comprising: (c) additive to enhance the performance of the composition selected from the group consisting of (1) extreme pressure and antiwear additives, (2) oxidation and thermal stability improvers, (3) corrosion inhibitors, (4) viscosity index improvers, (5) pour and floc point depressants, (6) detergents, (7) antifoaming agents and (8) viscosity adjusters.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-06-04 | 1993-12-04 | 1994-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-04 | 1997-12-04 | 1998-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-04 | 2001-12-04 | 2002-06-05 | $7700.00 | Window Closed / Lapsed |