Thermal sensitive materials

Details Thermal sensitive materials Thermal sensitive materials

1975-11-12

1976-08-31

Ansher, Harold

Stock material or miscellaneous articles

Composite

26032611R, 427145, 427150, 428537, 428913, B41M 512, B41M 518

Patent

active

039782700

ABSTRACT:
Thermal sensitive indigo compounds are disclosed.
A thermal sensitive sheet material is disclosed utilizing dehydroindigo di(alkyl acylates) as a color producing component. The material can be a copy medium and it can be transparent or non-transparent.
The indigo compounds are substantially colorless dehydroindigo di(alkyl acylates) colorable by thermal exposure.

REFERENCES:
patent: 3346571 (1967-10-01), Spatz et al.
patent: 3491111 (1970-01-01), Han Lin
Joseph Blanc, et al. "Procedure for Determining the Absorption Spectra of Mixed Photochromic Isomers" (RCA Laboratories) pub. in Jour. of Physical Chem. (vol. 72, 8) Aug. 1968, pp.2817-2824.

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