Malonic acid derivative composition for forming thermoparticulating coating
AssigneeWestinghouse Electric Corp.
InventorsJames D. B. Smith, David C. Phillips
Life of this patent
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Abstract
A composition is disclosed of a malonic acid derivative, 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 malonic acid derivative in the coating forms particles in the gas stream which are detected by a monitor.
Claims18
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 which comprises:
- 1. at least one compound having the general formula ##STR2## where R is selected from the group consisting of alkyl to C.sub.10, aryl, alkyl aryl to C.sub.10, cycloaliphatic, and heterocyclic, and R.sub.1 is selected from the group consisting of R and hydrogen;
- and
- 2.
A thermal detection system for electrical apparatus cooled by a gas stream comprising a monitor for detecting the presence of particles in said gas stream, and a coating which comprises a solid layer of a composition of at least one compound having the general formula ##STR3## where R is selected from the group consisting of alkyl to C.sub.10, aryl, alkyl aryl to C.sub.10, cycloaliphatic, and heterocyclic, and R.sub.1 is selected from the group consisting of R and hydrogen, and at least one resinous carrier curable and stable at 60.degree. C and unreactive with said compound, said coating being on a portion of said electrical apparatus exposed to said gas stream.
Dependencies are inferred from the claim text.