Compositions – Nonreactive analytical – testing – or indicating compositions
Patent
1981-05-07
1983-11-01
Gron, Teddy S.
Compositions
Nonreactive analytical, testing, or indicating compositions
106288B, 252962, 423 42, 423 46, 423101, 423103, 423366, 423385, 423413, 423463, 436 2, C01K 1114, C09K 300, C01G 300, C01G 304, C01G 1300, C01G 1304
Patent
active
044129360
ABSTRACT:
A pigment for a color-changing heat indicator comprising a product obtained by interaction of an aqueous solution containing ions of copper and mercury with an aqueous solution of a nitrogen-containing organic compound: an amide of carbonic acid, an amide of thiocarbonic acid, a tertiary amine to give a reaction mixture which is reacted with an aqueous solution containing ions of iodine at an atomic ratio of copper:mercury:iodine equal to 2:1.5:3-5 and an amount of the nitrogen-containing organic compound equal to 0.8-8% of the total content of copper and mercury; the pigment has its critical temperature of from 38.degree. to 70.degree. C. and a heat-resistance of from 160.degree. to 180.degree. C.
REFERENCES:
patent: 3219993 (1965-11-01), Schwertz
Suchow, L. et al., J. Am. Chem. Soc., vol. 75, pp. 518-522 (1953).
Gallais, M. F., Ann. Chim., pp. 117-193 (1938).
Day, J. H., Chem. Rev., vol. 68, No. 6, pp. 649-657 (1968).
Aranovich Viktor L.
Beskaravainy Vadim V.
Khmelkov Stanislav F.
Ramazanov Mnaidar R.
Soldaev Lev K.
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