Pigment for colour-changing heat indicator

Details Pigment for colour-changing heat indicator Pigment for colour-changing heat indicator

G - Physics

01

K

31/105, 6/217

G01K 11/12 (2006.01)

Patent

CA 1172842

ABSTRACT OF THE DISCLOSURE A pigment for a colour-changing heat indicator com- prising a product obtained by interaction of an aqueous solu- tion 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 to 70°C and a heat-resistance of from 160 to 180°C.

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