US3979353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diazonium salt composition for forming thermoparticulating coating
Assignee: Westinghouse Electric Corp
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Filing: 1975-04-15
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Granted: 1976-09-07
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Expires: 1995-04-15
Abstract
Abstract A composition is disclosed of a diazonium salt, a resinous carrier, and a solvent. The composition is applied to a portion of an electrical apparatus which is exposed to a gas stream. The solvent in the composition is evaporated to produce a thermoparticulating coating. When the electrical apparatus overheats the diazonium salt in the coating forms particles in the gas stream which are detected by a monitor.
Inventors
- 👤 James D. B. Smith
- 👤 David C. Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:28
CPC Classifications
G; G01; G01K; G01K11/00; G01K11/10; C; C08; C08K; C08K5/00; C08K5/16; C08K5/22; C08K5/23; C09; C09D; C09D163/00; C09D201/00; C09D5/00; C09D5/26
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
59 words
A composition comprising about 20 to about 250 phr of at least one diazonium salt solid and stable at 50°C and a solution of a resinous carrier curable and stable at 60°C and unreactive with said diazonium salt, where the amount of solvent in said solution is about 25 to about 75% (by weight based on said resinous carrier).
Claim 2
Dependent Claim
59 words
A composition comprising about 20 to about 250 phr of at least one diazonium salt solid and stable at 50°C and a solution of a resinous carrier curable and stable at 60°C and unreactive with said diazonium salt, where the amount of solvent in said solution is about 25 to about 75% (by weight based on said resinous carrier).
Claim 3
Dependent Claim
13 words
A composition according to claim 1 wherein said diazonium salt is a complex.
Claim 4
Dependent Claim
40 words
A composition according to claim 2 wherein said diazonium salt complex has the general formula: ##SPC2## where R is an electron-withdrawing group, R 1 is a Lewis acid, X - is a halogen ion, and n is 1 or 2.
Claim 5
Dependent Claim
14 words
A composition according to claim 3 wherein R is an ortho or para position.
Claim 6
Dependent Claim
40 words
A composition according to claim 3 wherein R is --X or ##STR2## where --X is halogen and each R 2 is independently selected from alkyl to C 20 alkylene to C 20 aryl, alkyl aryl to C 20 and cycloaliphatic.
Claim 7
Dependent Claim
15 words
A composition according to claim 5 wherein R 2 is alkyl to C 5 .
Claim 8
Dependent Claim
35 words
A composition according to claim 3 wherein R 1 is MX m where M is iron, tin, or zinc, phosphorus, boron, or antimony, X is halogen, and n is an integer from 2 to 5.
Claim 9
Dependent Claim
20 words
A composition according to claim 7 wherein R 1 is BF 3 , ZnCl 2 , or SnCl 4 .
Claim 10
Dependent Claim
12 words
A composition according to claim 3 wherein X - is chlorine ion.
Claim 11
Dependent Claim
13 words
A composition according to claim 3 wherein said complexed diazonium salt is ##SPC3##
Claim 12
Dependent Claim
13 words
A composition according to claim 3 wherein said complexed diazonium salt is: ##SPC4##
Claim 13
Dependent Claim
12 words
A composition according to claim 3 wherein said diazonium salt is ##SPC5##
Claim 14
Dependent Claim
39 words
A composition according to claim 1 wherein the amount of said diazonium salt is about 40 to about 60 phr and the amount of said solvent is about 45 to about 55% (by weight based on said resinous carrier).
Claim 15
Dependent Claim
14 words
A composition according to claim 1 wherein said resinous carrier is an epoxy resin.
Claim 16
Dependent Claim
21 words
A composition according to claim 14 which includes about 0.1 to about 3 phr of a drier for said epoxy resin.
Claim 17
Dependent Claim
27 words
A composition according to claim 15 which is prepared by first mixing said solution of resinous carrier and said drier and then mixing in said diazonium salt.
Claim 18
Dependent Claim
14 words
A composition according to claim 1 where the solvent in said solution is toluene.
Claim 19
Dependent Claim
15 words
A composition according to claim 1 wherein said diazonium salt is dispersed in said solution.
Claim 20
Dependent Claim
12 words
A composition according to claim 1 wherein said resinous carrier is air-dryable.
Claim 21
Dependent Claim
29 words
A thermoparticulating coating comprising a solid layer of resinous carrier containing about 20 to about 250 phr of an unreacted diazonium salt which is solid and stable at 50°C.
Claim 22
Dependent Claim
29 words
A thermoparticulating coating comprising a solid layer of resinous carrier containing about 20 to about 250 phr of an unreacted diazonium salt which is solid and stable at 50°C.
Claim 23
Dependent Claim
15 words
A coating according to claim 20 which is about 1/16 to about 1/2 inches thick.
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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) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |