Blocked isocyanate composition for forming T hermoparticulating coating
AssigneeWestinghouse Electric Corp.
InventorsJames D. B. Smith, Joseph F. Meier, David C. Phillips
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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.
Claims53
A composition comprising at least one blocked isocyanate solution of a resinous carrier curable and stable at 60.degree. C, and unreactive with said blocked isocyanate.
A thermoparticulating coating comprising a solid layer of a resinous carrier containing a blocked isocyanate, said resinous carrier being solid and stable at 60.degree. C and unreactive with said blocked isocyanate.
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.
Dependencies are inferred from the claim text.