Polaroid Corporation

Edward J Dombrowski, Jr

Patrick F King

James R Freedman

This invention relates to novel recording materials which employ color-forming di- and triarylmethane compounds possessing certain S-containing ring-closing moieties, namely, or thiolactone, dithiolactone or thioether ring-closing moiety and to a method of forming color by contacting these dye precursor compounds with a Lewis acid material capable of opening the thiolactone, dithiolactone or thioether ring-closing moiety whereby the compound is rendered colored, that is, converted to its chromophore color.

Recording material and process of using

This invention relates to the use of 3,5-dihydroxybenzoic acid as an organic acidic reagent in thermographic recording materials comprising a di- or triarylmethane thiolactone dye precursor, silver behenate and a polymeric binder, and in a further embodiment, relates to coating compositions useful in the preparation of the recording materials.

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Cambridge, MA, United States of America

Edward J Dombrowski, Jr