Oil-dispersed dyes in photopolym-erization systems

Claim 1

THE PROCESS OF PRODUCING A RESIST WITH AN IMAGE THAT HAS CLEAR BACKGROUNDS AND IS SHARP, COLORED AND CONTRASTY, WHICH COMPRISES EXPOSING TO LIGHT A LIGHT-SENSITIVE MATERIAL CARRYING N A SUITABLE BASE A HYDROPHILIC LAYER CONTAINING A HYDROPHILIC COLLOIDAL CARRIER, A HYDROPHILIC MONOMER CONTAINING THE GROUPING CH2=C<, A PHOTOPOLYMERIZATION CATALYST AND HAVING DISPERSED WITHIN SAID CARRIER, DROPLETS OF A SOLUTION OF AN OIL-SOLUBLE, LIPOPHILIC DYE IN A SUBSTANTIALLY WATER-INSOLUBLE, LOW MOLECULAR WEIGHT ORGANIC CRYSTALLOIDAL MATERIAL HAVING A BOILING POINT OF ABOVE 175*C., AND BEING SELECTED FROM THE GROUP CONSISTING OF TRICRESYL PHOSPHATDE, DIBUTYL PHTHALATE, 2-METHOXYBUTYL PHTHALATE, PHENETHYL ALCOHOL, TRIPHENYL PHOSPHATE, N-BUTYL SULFONE, N-HEXYLPHENYLCARBINOL, BENZOYL PIPERIDINE, SAID CRYSTALLOIDAL MATERIAL HAVING A HIGH SOLVENT ACTION FOR THE DYE, THE NATURE AND PROPORTIONS OF THE DYE AND THE CRYSTALLOIDAL MATERIAL BEING SO CHOSEN THAT PARTICLES THEREOF ARE LIQUID UNDER THE CONDITIONS OF COATING SO AS TO FORM DROPLETS HAVING A PARTICLE SIZE ON THE ORDER OF ONE MICRON WITHIN THE COATING; AND WASHING OUT THE UNPOLYMERIZED PORTIONS OF THE EXPOSED HYDROPHILIC COATING TO FORM A COLORED PHOTORESIST.