Reversible temperature-indicating composition

Details Reversible temperature-indicating composition Reversible temperature-indicating composition

1985-12-23

1988-03-22

Lovering, Richard D.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

106 21, 116217, 252962, 374162, 503208, B01J 1302, G01K 1116

Patent

active

047328100

ABSTRACT:
A new reversible temperature indicating composition for use in temperature indicating instruments is diclosed which is capable of accurate temperature indication in a variety of colors and characterized by a minimum range of hysteresis so that the marking drawn in this composition can decolor at or close the temperature at which its coloring takes place. In addition, the composition can provide a wide variety of hues and can be readily prepared. These and other advantages are provided by the inclusion as a main ingredient of an ester compound having .DELTA.T value, defined .DELTA.T=melting point--clouding point, in the range under 3.degree. C., the value that determines a desirably small range of hysteresis.

REFERENCES:
patent: 3079351 (1963-02-01), Staneslow et al.
patent: 3451338 (1969-06-01), Baum
patent: 3796669 (1974-03-01), Kiritani et al.
patent: 4028118 (1977-06-01), Nakasuji et al.
patent: 4197346 (1980-04-01), Stevens
patent: 4301054 (1981-11-01), Buirley et al.
patent: 4601588 (1986-07-01), Takahara et al.

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