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AssigneeLa Cellophane
InventorClaude Ceintrey
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Phenylurethane compounds formed by the reaction between a phenolic coupler compound and an organic isocyanate compound are utilized to form phenolic coupler compounds in situ in order to react with chromogenic compounds present in the sensitive layer of recording or reproducing materials. The phenolic coupler compounds can also be stabilized by blocking the phenolic hydroxyl with carbonate, an alkyl ether, organosilylated ether or organophosphoric acid ester, some of which are novel compounds. These stabilized derivatives of the stabilized phenolic coupler compound will decompose by application to sufficient thermal energy or suitable liquid or gaseous fluid to form the phenolic coupler compound in situ. The phenolic coupler compound is formed in situ by applying thermal energy to the sensitive layer or by applying to the sensitive layer a liquid or gaseous fluid which is able to decompose the stabilized phenolic coupler compound and release the phenolic coupler compound. Preferred chromogenic compounds include spiropyrans, triphenylmethane derivatives, ferric salts, non-photosensitive silver salts and diazonium compounds. Use in a diazo process is particularly beneficial. Sensitive recording materials of greatly improved shelf-life are provided. The compositions and recording or reproducing materials have applicability to photosensitive and thermosensitive systems and in dry, semi-dry and wet development processes.
A recording or reproduction material comprising a support and a coating of a sensitive layer on said support, said sensitive layer containing, as essential color forming reactants, a chromogenic compound capable of reacting with a phenolic coupler compound to form a colored reaction product selected from the group consisting of spiropyram compounds, triarylmethane compounds, chromogenic ferric salts, non-photosensitive chromogenic silver salts and diazonium compounds, and a hydroxyl group-blocked phenolic coupler compound which is the reaction product of a phenolic coupler compound and a hydroxyl group reactive compound capable of replacing the hydrogen atom of each phenolic hydroxyl group of the phenolic coupler compound, the stabilized phenolic compound being non-reactive to the chromogenic compound and being capable of producing the phenolic coupler compound by decomposition in situ wherein the stablized phenolic coupler compound is a derivative of 2,3-dihydroxynaphthalene of the formula ##STR59## wherein G represents a hydrogen atom, a sulfonic group or a sulfonate of ammonium or an amine and represented by the formula:
Dependencies are inferred from the claim text.