Composition for forming colored images, new recording material and process using same
AssigneeLa Cellophane
InventorsClaude Ceintrey, Herve Nicolle
Life of this patent
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Abstract
The photochromic activity of triphenylmethane paraamino leuco salts is reversibly inactivated in compositions containing the leuco salt with certain metallic oxides or sulfides. The photochromic properties of the leuco salts are restored by the application of energy, e.g. heat, mechanical pressure, etc. The sensitive compositions containing the leuco salt and metal oxide or sulfide are useful in a process for recording information according to a predetermined pattern by applying a local heat source or local pressure source to a recording material containing a layer of the sensitive composition, the application of energy resulting in the formation of colored marks corresponding to the information to be recorded.
Claims23
A composition for use in the production of colored images by the application of heat or pressure comprising an intimate mixture of:
- a. triphenylmethane paraamino leuco salt of the formula:
- ##STR2## wherein X is halogen, CN or HSO.sub.3 ;
- Y, Z and T which may be the same or different are hydrogen or a substituted or unsubstituted amino group, with the proviso that at least one of Y, Z and T is an amino group:
- and R.sub.1, R.sub.2 and R.sub.3 which may be the same or different are hydrogen, halogen or alkyl of 1 to 3 carbon atoms;
- and
- b. a metallic oxide or metallic sulfide selected from the group consisting of zinc sulfide, zinc oxide, tin oxide, titanium oxide, alumina and silica
- wherein the ratio of (a) to (b) is from 0.001:1 to 0.005:1 by weight.
Dependencies are inferred from the claim text.