Reversible thermochromic pigments

Details Reversible thermochromic pigments Reversible thermochromic pigments

1993-07-27

1996-01-02

Lovering, Richard D.

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

8526, 252583, 252586, 252600, 252962, 428913, 430962, C08K 516, C09B 1108, G02B 523, G03C 500

Patent

active

054804825

ABSTRACT:
A color changing pigment composition which changes color reversibly when ted comprising (a) a cyclic aryl lactone dye, (b) a diaminoalkane activator and (c)an ester. The pigment composition can also include a white pigment such as titanium dioxide as an opacifier or a yellow dye such Hansa yellow G. The pigment composition changes from a dark color, e.g. blue, to white when the composition is heated to a specified temperature, e.g. to a temperature of 52.degree. C., and reversibly changes from white back to the blue color when the pigment composition is cooled, e.g. to a temperature below about 25.degree. C.

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patent: 4764500 (1988-08-01), Araki et al.
patent: 4851282 (1989-07-01), Shimizu et al.
patent: 4857410 (1989-08-01), Yamahata
patent: 4931221 (1990-06-01), Heller

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