US4056005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blocked isocyanate composition for forming T hermoparticulating coating
Assignee: Westinghouse Electric Corp
•
Filing: 1975-04-15
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Granted: 1977-11-01
•
Expires: 1995-04-15
Abstract
Abstract A composition is disclosed of a blocked isocyanate, 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 blocked isocyanate in the coating forms particles in the gas stream which are detected by a monitor.
Inventors
- 👤 James D. B. Smith
- 👤 Joseph F. Meier
- 👤 David C. Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:58
CPC Classifications
G; G01; G01K; G01K11/00
Claims Analysis
Total Claims: 56
Claim 1
Independent Claim
25 words
A composition comprising at least one blocked isocyanate solution of a resinous carrier curable and stable at 60° C, and unreactive with said blocked isocyanate.
Claim 2
Dependent Claim
25 words
A composition comprising at least one blocked isocyanate solution of a resinous carrier curable and stable at 60° C, and unreactive with said blocked isocyanate.
Claim 3
Dependent Claim
45 words
A composition according to claim 1 wherein said blocked isocyanate has the general formula: ##STR9## and may be regarded as the reaction product of R 1 NCO and HR 2 , where R 1 NCO is an isocyanate and HR 1 is a Lewis base.
Claim 4
Dependent Claim
28 words
A composition according to claim 2 wherein R 1 NCO is an isocyanate selected from the group consisting of aliphatics, aryls, cycloaliphatics, heterocyclics, alkylaryls, and isocyanate substitutions thereof.
Claim 5
Dependent Claim
25 words
A composition according to claim 3 wherein said isocyanate is selected from the group consisting of phenyl isocyanate, butyl isocyanate, toluene diisocyanate, and hexamethylene isocyanate.
Claim 6
Dependent Claim
31 words
A composition according to claim 2 wherein HR 2 is a Lewis base selected from the group consisting of oximes, secondary amines, mercaptans, alcohols, esters, carboxyesters,, phenols, thiophenols, and glycidyl ethers.
Claim 7
Dependent Claim
21 words
A composition according to claim 5 wherein said Lewis base is selected from the group consisting of oximes and secondary amines.
Claim 8
Dependent Claim
23 words
A composition according to claim 6 wherein said oxime is ethylmethyl ketoxime or diethyl ketoxime, and said secondary amine is dimethylamine or diethylamine.
Claim 9
Dependent Claim
16 words
A composition according to claim 1 wherein said blocked isocyanate is a solid at 60° C.
Claim 10
Dependent Claim
42 words
A composition according to claim 1 wherein the amount of said blocked isocyanate is about 20 to about 250 phr and the amount of the solvent in said solution is about 25 to about 75% (by weight based on said resinous carrier).
Claim 11
Dependent Claim
39 words
A composition according to claim 9 wherein the amount of said blocked isocyanate 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 12
Dependent Claim
14 words
A composition according to claim 1 wherein said resinous carrier is an epoxy resin.
Claim 13
Dependent Claim
22 words
A composition according to claim 11 which includes about b 0.1 to about 3 phr of a drier for said epoxy resin.
Claim 14
Dependent Claim
27 words
A composition according to claim 12 which is prepared by first mixing said solution of resinous carrier and said drier and then mixing in said blocked isocyanate.
Claim 15
Dependent Claim
14 words
A composition according to claim 1 wherein the solvent in said solution is toluene.
Claim 16
Dependent Claim
15 words
A composition according to claim 1 wherein said blocked isocyanate is dispersed in said solution.
Claim 17
Dependent Claim
12 words
A composition according to claim 1 wherein said resinous carrier is air-dryable.
Claim 18
Dependent Claim
80 words
A method of protecting electrical apparatus from damage due to overheating and for thereafter determining the location of said overheating, said apparatus including a gas stream and a monitor for detecting particles in said gas stream and for emitting a signal when said particles are detected comprising: A. preparing a composition according to claim 1; B. applying said composition to said electrical apparatus at positions exposed to said gas stream; and C. evaporating said solvent and curing said resinous carrier.
Claim 19
Dependent Claim
33 words
A method according to claim 17 including the additional last step of inspecting said apparatus visually for blistered and darkened areas, after a signal has been emitted, to locate the area of overheating.
Claim 20
Dependent Claim
29 words
A method according to claim 17 including the additional last step of collecting a sample of said gas stream after a signal has been emitted, and analyzing said sample.
Claim 21
Dependent Claim
45 words
A method according to claim 17 wherein said blocked isocyanate has the general formula: ##STR10## and may be regarded as the reaction product of R 1 NCO and HR 2 , where R 1 NCO is an isocyanate and HR 1 is a Lewis base.
Claim 22
Dependent Claim
28 words
A method according to claim 20 wherein R 1 NCO is an isocyanate selected from the group consisting of aliphatics, aryls, cycloaliphatics, heterocyclics, alkylaryls, and isocyanate substitutions thereof.
Claim 23
Dependent Claim
25 words
A method according to claim 21 wherein said isocyanate is selected from the group consisting of phenyl isocyanate, butyl isocyanate, toluene diisocyanate, and hexamethylene isocyanate.
Claim 24
Dependent Claim
31 words
A method according to claim 20 wherein HR 2 is a Lewis base selected from the group consisting of oximes, secondary amines, mercaptans, alcohols, esters, carboxyesters, phenols, thiophenols, and glycidyl ethers.
Claim 25
Dependent Claim
21 words
A method according to claim 23 wherein said Lewis base is selected from the group consisting of oximes and second amines.
Claim 26
Dependent Claim
23 words
A method according to claim 24 wherein said oxime is ethylmethyl ketoxime or diethyl ketoxime, and said secondary amine is dimethylamine or diethylamine.
Claim 27
Dependent Claim
16 words
A method according to claim 17 wherein said blocked isocyanate is a solid at 60° C.
Claim 28
Dependent Claim
42 words
A method according to claim 17 wherein the amount of said blocked isocyanate is about 20 to about 250 phr and the amount of the solvent in said solution is about 25 to about 75% (by weight based on said resinous carrier).
Claim 29
Dependent Claim
39 words
A method according to claim 17 wherein the amount of said blocked isocyanate 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 30
Dependent Claim
14 words
A method according to claim 28 wherein said resinous carrier is an epoxy resin.
Claim 31
Dependent Claim
21 words
A method according to claim 17 which includes about 0.1 to about 3 phr of a drier for said epoxy resin.
Claim 32
Dependent Claim
27 words
A method according to claim 30 which is prepared by first mixing said solution of resinous carrier and said drier and then mixing in said blocked isocyanate.
Claim 33
Dependent Claim
14 words
A method according to claim 17 wherein the solvent in said solution is toluene.
Claim 34
Dependent Claim
15 words
A method according to claim 17 wherein said blocked isocyanate is dispersed in said solution.
Claim 35
Dependent Claim
12 words
A method according to claim 17 wherein said resinous carrier is air-dryable.
Claim 36
Dependent Claim
31 words
A thermoparticulating coating comprising a solid layer of a resinous carrier containing a blocked isocyanate, said resinous carrier being solid and stable at 60° C and unreactive with said blocked isocyanate.
Claim 37
Dependent Claim
31 words
A thermoparticulating coating comprising a solid layer of a resinous carrier containing a blocked isocyanate, said resinous carrier being solid and stable at 60° C and unreactive with said blocked isocyanate.
Claim 38
Dependent Claim
15 words
A coating according to claim 35 which is about 1/16 to about 1/2 inches thick.
Claim 39
Dependent Claim
44 words
A thermal detection system for electrical apparatus cooled by a gas stream, comprising a coating according to claim 35 on a portion of said electrical apparatus exposed to said gas stream and a monitor for detecting the presence of particles in said gas stream.
Claim 40
Dependent Claim
47 words
A thermal detection system according to claim 37 wherein said blocked isocyanate has the general formula: ##STR11## and may be regarded as the reaction product of R 1 NCO and HR 2 , where R 1 NCO is an isocyanate and HR 1 is a Lewis base.
Claim 41
Dependent Claim
30 words
A thermal detection system according to claim 38 wherein R 1 NCO is an isocyanate selected from the group consisting of aliphatics, aryls, cycloaliphatics, heterocyclics, alkylaryls, and isocyanate substitutions thereof.
Claim 42
Dependent Claim
27 words
A thermal detection system according to claim 39 wherein said isocyanate is selected from the group consisting of phenyl isocyanate, butyl isocyanate, toluene diisocyanate, and hexamethylene isocyanate.
Claim 43
Dependent Claim
33 words
A thermal detection system according to claim 38 wherein HR 2 is a Lewis base selected from the group consisting of oximes, secondary amines, mercaptans, alcohols, esters, carboxyesters, phenols, thiophenols, and glycidyl ethers.
Claim 44
Dependent Claim
23 words
A thermal detection system according to claim 41 wherein said Lewis base is selected from the group consisting of oximes and secondary amines.
Claim 45
Dependent Claim
25 words
A thermal detection system according to claim 42 wherein said oxime is ethylmethyl ketoxime or diethyl ketoxime, and said secondary amine is dimethylamine or diethylamine.
Claim 46
Dependent Claim
18 words
A thermal detection system according to claim 37 wherein said blocked isocyanate is a solid at 60° C.
Claim 47
Dependent Claim
44 words
A thermal detection system according to claim 37 wherein the amount of said blocked isocyanate is about 20 to about 250 phr and the amount of the solvent in said solution is about 25 to about 75% (by weight based on said resinous carrier).
Claim 48
Dependent Claim
41 words
A thermal detection system according to claim 45 wherein the amount of said blocked isocyanate 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 49
Dependent Claim
16 words
A thermal detection system according to claim 37 wherein said resinous carrier is an epoxy resin.
Claim 50
Dependent Claim
23 words
A thermal detection system according to claim 47 which includes about 0.1 to about 3 phr of a drier for said epoxy resin.
Claim 51
Dependent Claim
29 words
A thermal detection system according to claim 48 which is prepared by first mixing said solution of resinous carrier and said drier and then mixing in said blocked isocyanate.
Claim 52
Dependent Claim
16 words
A thermal detection system according to claim 22 wherein the solvent in said solution is toluene.
Claim 53
Dependent Claim
17 words
A thermal detection system according to claim 22 wherein said blocked isocyanate is dispersed in said solution.
Claim 54
Dependent Claim
14 words
A thermal detection system according to claim 22 wherein said resinous carrier is air-dryable.
Claim 55
Dependent Claim
43 words
A compound selected from the group consisting of toluene diisocyanate blocked with mercaptobenzothiazole, phenyl isocyanate blocked with 1,3-diethyl-5,5-dimethyl hydantoin, phenyl isocyanate blocked with ethylmethyl ketoxime, phenyl isocyanate blocked with N(2-hydroxyethyl) piperazine, butyl isocyanate blocked with 4,4'-thiophenol and butyl isocyanate blocked with 4,4'-sulfonyl diphenol.
Claim 56
Dependent Claim
43 words
A compound selected from the group consisting of toluene diisocyanate blocked with mercaptobenzothiazole, phenyl isocyanate blocked with 1,3-diethyl-5,5-dimethyl hydantoin, phenyl isocyanate blocked with ethylmethyl ketoxime, phenyl isocyanate blocked with N(2-hydroxyethyl) piperazine, butyl isocyanate blocked with 4,4'-thiophenol and butyl isocyanate blocked with 4,4'-sulfonyl diphenol.
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) | 1980-10-31 | 1981-05-02 | 1981-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-31 | 1985-05-02 | 1985-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-31 | 1989-05-02 | 1989-11-01 | $7700.00 | Window Closed / Lapsed |