Claims
- 1. A room temperature, air-dryable coating composition comprising at least one thermoparticulating carboxylic acid and a solution in an organic solvent of a room temperature, air-dryable polyester or epoxy resinous carrier which is and substantially unreactive with said carboxylic acid and stable when cured, said carboxylic acid having the general formula HOOCR, where R is ##STR15## or --CHR"R' where R' is alkyl to C.sub.24 or carboxyalkyl to C.sub.24, R" is H or OH, and where each X is independently selected from the group consisting of halogen, nitro, alkyl to C.sub.5, carboxy, and amino, and n is 1 to 5 wherein the amount of said carboxylic acid 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).
- 2. A composition according to claim 1 wherein R is CHR"R'.
- 3. A composition according to claim 2 wherein R' is carboxyalkyl from C.sub.2 to C.sub.18 and R" is hydrogen.
- 4. A composition according to claim 1 wherein X is halogen, nitro, or a mixture thereof, and n is 1.
- 5. A composition according to claim 1 wherein the amount of said carboxylic acid 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).
- 6. A composition according to claim 1 wherein said resinous carrier is an epoxy resin.
- 7. A composition according to claim 6 which includes about 0.1 to about 3 phr of a drier for said epoxy resin.
- 8. A composition according to claim 7 which is prepared by first mixing said solution of resinous carrier and said drier and then mixing in said carboxylic acid.
- 9. A composition according to claim 1 wherein the solvent in said solution is toluene.
- 10. A composition according to claim 1 wherein said carboxylic acid is dispersed in said solution.
- 11. 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;
- (C) evaporating said solvent; and
- (D) monitoring said gas stream for the presence of particles therein.
- 12. A method according to claim 11 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.
- 13. A method according to claim 12 including the additional last steps of collecting a sample of said gas stream after a signal has been emitted, and analyzing said sample.
- 14. A thermoparticulating coating comprising a solid layer of room temperature, air-dried polyester or epoxy resinous carrier containing about 20 to about 250 phr of a thermoparticulating carboxylic acid having the general formula HOOCR, where R is ##STR16## or --CHR"R' where R' is alkyl to C.sub.24 or carboxyalkyl to C.sub.24, R" is H or OH, and where X is independently selected from the group consisting of halogen, nitro, alkyl to C.sub.5, carboxy, and amino, and n is 1 to 5.
- 15. A coating according to claim 14 which is about 1/16 to about 1/2 inches thick.
- 16. A thermal detection system for electrical apparatus cooled by a gas stream comprising a coating according to claim 14 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.
Parent Case Info
This is a CONTINUATION of application Ser. No. 690,442 filed May 27, 1976, now abandoned.
US Referenced Citations (13)
Continuations (1)
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Number |
Date |
Country |
Parent |
690442 |
May 1976 |
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