Image forming compositions including an azide and transition metal complexes of triorganophosphines

Abstract

Abstract PHOTOGRAPHIC IMAGE-FORMING COMPOSITIONS THAT INCLUDE (1) AN ORGANOAZIDE SUCH AS AN ARYL AZIDE AND (2) A LABILE PHOSPHINE COMPLEX THAT, ON CHEMICAL TREATMENT, CAN LIBERATE A TRIORGANOPHOSPHINE, E.G. A TRIARYLPHOSPHINE, WHICH CAN FORM A RADIATION-SENSITIVE COMPLEX WITH THE AZIDE, CAN BE ACTIVATED BY CHEMICAL TREATMENT AND THEREAFTER IMAGEWISE EXPOSED TO ACTIVATING RAYS TO YIELD A SPECIES THAT CAN REACT WITH A DYE-FORMING COUPLER TO FORM AN IMAGE-DYE. THESE COMPOSITIONS ARE SUBSTANTIALLY LIGHT-SENSITIVE PRIOR TO CHEMICAL TREATMENT WHICH ACTIVATES THE COMPOSITION BY LIBERATING TRIORGANOPHOSPHINE, WHEREUPON THE PHOSPHINE-AZIDE COMPLEX IS FORMED IN SITU, AND SHELF LIFE IS DESIRABLY EXTENDED. WHEN THESE COMPOSITIONS ARE CARRIED ON A SUPPORT, IMAGE-FORMING ELEMENTS ARE PRESENTED. ONCE THE AZIDE-PHOSPHINE COMPLEX IS PRESENT IN AN ACTIVATED COMPOSITION, IMAGEWISE EXPOSURE TO ACTIVATING RAYS AND SUBSEQUENT OR CONCOMITANT TREATMENT WITH A DYEFORMING COUPLER OR THE LIKE PRODUCES A NEGATIVE IMAGE (I.E., ONE CORRESPONDING TO EXPOSED REGIONS). IF A LEUCO COMPOUND, DYE FORMING COUPLER, ETC., IS ALSO INCLUDED IN THE COMPOSITION, THEN A VISIBLE IMAGE GENERALLY FORMS ON EXPOSURE. AFTER PRODUCTION OF THE IMAGE, IT CAN BE STABILIZED BY OVERALL HEATING. IN CERTAIN CASES, HEAT FIXATION ALSO PRODUCES INTENSIFICATION OF A LOW DENSITY OR SUBSTANTIALLY LATENT IMAGE. IF DESIRED, POSITIVE IMAGES CAN BE FORMED BY THERMOPHOTOGRAPHIC MEANS. ONCE THE PHOSPHINE-AZIDE COMPLEX IS FORMED, IMAGEWISE EXPOSURE TO HEAT DENSITIZES THE COMPLEX IN HEATED REGIONS AND A SUBSEQUENT OVERALL EXPOSURE TO ACTIVATING RAYS PRODUCES EITHER A VISIBLE OR AN INTENSIFIABLE PHOTOGRAPHIC IMAGE. NO HEAT FIXATION IS REQUIRED, BUT IMAGE INTENSIFICATION BY HEAT MAY BE ACCOMPLISHED IF DESIRED. MULTI-COLOR IMAGES CAN BE PREPARED WHEN AN INCLUDED COUPLER IS OF THE TYPE THAT WILL REACT WITH THE AZIDE WHEN SUITABLY EXPOSED. LITHOGRAPHIC PRINTING SURFACES CAN BE PREPARED WHEN A HYDROPHILIC, POLYMERIC AZIDE IS USED TO FORM THE COMPLEX OR WHEN HYDROPHILIC POLYMERIC COUPLERS ARE USED TO FORM THE IMAGE DYE.

Inventors

• 👤 N Nelson

Bibliographic Details