Patent US3957530A successfully refreshed from Google Patents.
US3957530A
Expired / Lapsed
US
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Ternary azeotropic paint stripping compositions
Assignee: Phillips Petroleum Co
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Filing: 1975-03-31
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Granted: 1976-05-18
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Expires: 1995-03-31
Abstract
Abstract Constant boiling admixtures are formed with 1,2-dichloro-1-fluoroethane, acetone, and methanol and applied to painted surfaces to remove paint therefrom.
Inventors
- 👤 Robert E. Reusser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:12
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/50; C11D7/5036; C11D7/5068; C11D7/5077; C11D7/5086; C09; C09D; C09D9/00; C09D9/005; C09K; C09K3/00; C09K3/30; C23; C23G; C23G5/00; C23G5/02; C23G5/032
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
60 words
A process for removing paint from painted surfaces which comprises contacting said painted surface with a substantially constant boiling admixture comprising (A) 1,2-dichloro-1-fluoroethane, (B) acetone, and (C) methanol, characterized by a weight percent ratio of about 25 to 41 (A), about 25 to 33 (B), and about 26 to 40 (C), thereby softening said paint, and thereafter removing said paint.
Claim 2
Dependent Claim
60 words
A process for removing paint from painted surfaces which comprises contacting said painted surface with a substantially constant boiling admixture comprising (A) 1,2-dichloro-1-fluoroethane, (B) acetone, and (C) methanol, characterized by a weight percent ratio of about 25 to 41 (A), about 25 to 33 (B), and about 26 to 40 (C), thereby softening said paint, and thereafter removing said paint.
Claim 3
Dependent Claim
25 words
The process according to claim 1 wherein said admixture is characterized by a boiling point of about 59° to 61°C at about 761 millimeters mercury.
Claim 4
Dependent Claim
42 words
The process according to claim 2 wherein said substantially boiling admixture is characterized by a weight percent ratio of about 40 to 41 (A), about 32 to 33 (B), and about 26 to 28 (C), wherein said admixture represents a ternary azeotrope.
Claim 5
Dependent Claim
22 words
The process according to claim 1 wherein said softening admixture further comprises a gellant, such that said admixture is a gelled composition.
Claim 6
Dependent Claim
44 words
The process according to claim 4 wherein said gellant is a methyl or ethyl cellulose, cellulose acetate, nitrocellulose, paraffin wax, or polyalkylene oxide, and is employed in a range of about 0.1-5 weight percent gellant relative to said admixture of (A), (B) and (C).
Claim 7
Dependent Claim
18 words
The process according to claim 5 wherein said gellant is said polyalkylene oxide, and is a polyethylene oxide.
Claim 8
Dependent Claim
74 words
A substantially gelled paint softening composition suitable for softening paint on painted surfaces which comprises (I) a substantially constant boiling admixture of (A) 1,2-dichloro-1-fluoroethane, (B) acetone, and (C) methanol, characterized by a weight percent ratio of about 25 to 41 weight percent (A), about 25 to 33 weight percent (B), and about 26 to 40 weight percent (C), and (II) a gellant employed in an amount effective to result in a substantially gelled composition.
Claim 9
Dependent Claim
74 words
A substantially gelled paint softening composition suitable for softening paint on painted surfaces which comprises (I) a substantially constant boiling admixture of (A) 1,2-dichloro-1-fluoroethane, (B) acetone, and (C) methanol, characterized by a weight percent ratio of about 25 to 41 weight percent (A), about 25 to 33 weight percent (B), and about 26 to 40 weight percent (C), and (II) a gellant employed in an amount effective to result in a substantially gelled composition.
Claim 10
Dependent Claim
33 words
The composition according to claim 7 wherein said admixture is characterized by a weight percent ratio of about 40 to 41 (A), about 32 to 33 (B), and about 26 to 28 (C).
Claim 11
Dependent Claim
44 words
The composition according to claim 7 wherein said gellant is a methyl or ethyl cellulose, cellulose acetate, nitrocellulose, paraffin wax, or polyalkylene oxide, and is employed in a range of about 0.1-5 weight percent gellant relative to said admixture of (A), (B) and (C).
Claim 12
Dependent Claim
18 words
The composition according to claim 8 wherein said gellant is said polyalkylene oxide, and is a polyethylene oxide.
Claim 13
Dependent Claim
58 words
A method of preparing a paint softening composition as described in claim 7 which comprises admixing 1,2-dichloro-1-fluoroethane, acetone, methanol, and at least one gellant, employing a weight percent ratio of about 25 to 41 weight percent 1,2-dichloro-1-fluoroethane, about 25 to 33 weight percent acetone, about 26 to 40 weight percent methanol, and about 0.1-5 weight percent said gellant.
Claim 14
Dependent Claim
24 words
The method according to claim 11 wherein said gellant is a methyl or ethyl cellulose, cellulose acetate, nitrocellulose, paraffin wax,or polyalkylene oxide. wax, or
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |