Dye-sensitized photosensitive materials having improved photographic speed

Abstract

Abstract REPRODUCTION SYSTEMS HAVING IMPROVED PHOTOGRAPHIC EXPOSURE SPEED ARE ACHIEVED WHEREIN CERTAIN CLASSES OF CYANINE AND HEMICYANINE DYES ARE ADDED TO PHOTOSENSITIVE PHOTOCONDUCTOR MATERIALS COMPRISING TITANIUM DIOXIDE WHICH, WHEN ACTIVATED, ARE CAPABLE OF PRODUCING CHEMICAL REACTION WHEN IN CONTACT WITH IMAGE-FORMING MATERIAL TO PRODUCE A VISIBLE IMAGE. THESE CLASSES OF CYANINE AND HEMICYANINE DYES ARE DESCRIBED BY THE FOLLOWING GENERIC STRUCTURAL FORMULAS: 1-((R1-)2N-),4-(Y-(C(-R1)=C(-R1))N-1-),R2-BENZENE Z-((R1-)C=C(-R1))N-1(R-)C=<(-N(-R3)-(R2-1,2-PHENYLENE)- A-) AND WHEREIN Y IS SELECTED FROM ANY OF THE GROUP CONSISTING OF: (1-R3,3,3-DI(R2),R2-3H-INDOL-2-YL)+ X- (1-R3,3-R2,R2-IMIDAZOL-2-YL)+ X- (1-R38(R2)3-QUINOLIN-2-YL)+ X- AND R3-N+<(=C(-)-A-(R5-)C=C(-R6)-) X- R3-N+<(=C(-)-A-(R2-)C=N-) X- AND Z IS SELECTED FOR ANY OF THE GROUP CONSISTING OF: R4-N+<(=C(-)-A-(R2-1,2-PHENYLENE)-) X- AND (R2)2-QUINOLIN-4-YL R MAY BE AN -H OR A -C=N GROUP; R1 MAY BE HYDROGEN, ALKYL, ARALKYL, ARYL, AND ALKARYL GROUPS AND WHEREIN ANY R1 ON A GIVEN MOLECULE MAY BE THE SAME OR DIFFERENT AS ANY OTHER R1 ON THIS MOLECULE; R2 MAY BE HYDROGEN, ALKYL, ARALKYL, ARYL, ALKARYL, ALKOXY, AND -N(-R1)2 WHEREIN R1 IS AS ABOVE DESCRIBED AND WHEREIN ANY R2 ON A GIVEN MOLECULE MAY BE THE SAME OR DIFFERENT AS ANY OTHER R2 ON THIS MOLECULE; R3 AND R4 MAY BE HYDROGEN, AN ALKYL, ARALKYL, OR AN ALKANOL GROUP AND MAY BE THE SAME OR DIFFERENT, OR R3 AND R4 MAY FORM PART OF THE SAME ALKYLENE, ARALKYLENE, ALKALKYLENE, OR HYDROXY SUBSTITUTED ALKYLENE GROUP; R5 AND R6 MAY BE HYDROGEN, ALKYL, ARALKYL, ARYL OR ALKARYL GROUPS AND WHEREIN R5 OR R6 MAY BE THE SAME OR DIFFERENT THAN ANY OTHER R5 OR R6 GROUP ON THE SAME MOLECULE AND WHEREIN R5 OR R6 MAY FORM PART OF THE SAME RING STRUCTURE WHEN ON ADJACENT CARBON ATOMS AND AS SUCH SAME RING STRUCTURE MAY FORM CYCLOAKLYLENE OR ARYL GROUPS, OR SUBSTITUTED CYCLOALKYLENE OR ARYL GROUPS; R7 IS AN -OR1 OR -N(-R1)(-R2) GROUP AND AT LEAST ONE R7 GROUP MUST BE PRESENT; X IS A MONOVALENT ACID RADICAL, AND PREFERABLY A HALIDE GROUP SUCH AS FLUORIDE, CHLORIDE, OR IODIDE GROUP; A IS A SULPHUR (S) OR A SELENIUM (SE) GROUP; AND A IS A POSITIVE INTEGER SELECTED FROM THE GROUP CONSISTING OF 1,2,3,4 AND 5. IMPROVED PROCESSES USING THIS IMPROVED PHOTOGRAPHIC MATERIAL COMPRISES SELECTIVELY EXPOSING THE ABOVE-DESCRIBED REPRODUCTION SYSTEM TO ACTIVATING RADIATION. IMAGE-FORMING MATERIAL CAN BE PRESENT ON THE SUBSTRATE AT THE TIME OF EXPOSURE TO GIVE A DIRECT READOUT OR ONLY PART OF THE IMAGE-FORMING MATERIAL SUCH AS AN OXIDIZING AGENT SUCH AS SILVER NITRATE MAY BE PRESENT ON THE SUBSTRATE AT THE TIME OF EXPOSURE, WITH THE ADDITIONAL COMPONENT OF THE IMAGE-FORMING MATERIAL BEING ADDED AFTER EXPOSURE SUCH AS BY CONTACTING WITH A REDUCING AGENT SUCH AS METOL. ON THE OTHER HAND, IT IS POSSIBLE TO APPLY ALL OF THE IMAGEFORMING MATERIAL AT A TIME SUBSEQUENT TO EXPOSURE TO FORM A VISIBLE IMAGE. TITANIUM DIOXIDE HAVING A PARTICLE SIZE LESS THAN ABOUT 250 MILLIMICRONS AND WHICH HAS BEEN HEATED AT A TEMPERATURE BETWEEN ABOUT 200*C. TO ABOUT 950*C. IS THE PREFERRED PHOTOSENSTIVE MATERIAL.

Inventors

• 👤 Juergen H H Keller
• 👤 Robert Hicks Sprague

Bibliographic Details