Abstract A transfer resistant diazo photographic element is provided by employing an improved backwet composition, which when coated on the back of light sensitive diazo elements will inhibit offset or transfer of the sensitized coating from the front to a juxtaposed or contracting back of the element. Such transfer inhibition is vital when the element is stored under conditions causing contact of the front and back sides of the film, e.g., in tightly rolled condition. This transfer inhibition is accomplished by employing either selected solid, particulate, components in a standard back-wetting solution to form a back-wet slurry or selected cured thermosetting resins soluble in standard back-wetting solutions. The particulate components are small particle size inorganic compounds, for example, silica. An example of the thermo-setting resins that may be employed is ureaformaldehyde resin. The composition thus provided, has at least the dual functionality of preventing offset, and of controlling curl in the film or element.
A PHOTOGRAPHIC ELEMENT HAVING A TRANSPARENT POLYMERIC FILM BASE SUPPORT, A DIAZO-SENSITIZING COMPOSITION COATED ON ONE SIDE OF SAID SUPPORT, AND COATED ON THE OTHER SIDE OF SAID SUPPORT, A BACKWET COMPOSITION COMPRISING A MIXTURE OF (A) A TRANSFER PREVENTING ADDITIVE SELECTED FROM TE GROUP CONSISTING OF: (1) PARTICLES SOLIDS HAVING A PARTICLE SIZE OF ABOUT 0.007 TO ABOUT 0.012 MICRONS SELECTED FROM THE GROUP CONSISTING OF SILICA AND ALUMINA, (2) A CURED THERMOSETTING RESIN SELECTED FROM THE GROUP CONSISTING OF AMINO RESINS, POLYESTER RESINS, EPOXY RESINS AND PHENOLIC RESINS, AND (3) A HYDROXYLMODIFIED VINYL CHLORIDE-VINYL ACETATE COPOLYMER AND (B) A POLYMERIC BINDER RESIN SELECTED FROM THE GROUP CONSISTING OF CELLULOSE TRACETATE, CELLULOSE ACETATE BUTYRATE, CELLULOSE ACE TATE PROPIONATE, POLYVINYL CHLORIDE ACETATE, POLYSTYRENE, POLYETHYLENE TEREPHTHALATE AND BISPHENENOL-A-POLYCARBONATE, SAID BACKWET COMPOSITION BEING COATED FROM AN ORGANIC SOLVENT CONTAINING COATING COMPOSITION, SAID SOLVENT HAVING A BOILING POINT BELOW ABOUT 140*C WHEREIN SAID BINDER SAID RESINS AND SAID COPOLYMER BEING DISSOLVED IN SAID COATING COMPOSITION, AND SAID POLYMERIC FILM BASE SUPPORT BEING THE SAME POLYMER AS SAID POLYMERIC BINDER RESIN.
Claim 2
Dependent Claim
177 words
A PHOTOGRAPHIC ELEMENT HAVING A TRANSPARENT POLYMERIC FILM BASE SUPPORT, A DIAZO-SENSITIZING COMPOSITION COATED ON ONE SIDE OF SAID SUPPORT, AND COATED ON THE OTHER SIDE OF SAID SUPPORT, A BACKWET COMPOSITION COMPRISING A MIXTURE OF (A) A TRANSFER PREVENTING ADDITIVE SELECTED FROM TE GROUP CONSISTING OF: (1) PARTICLES SOLIDS HAVING A PARTICLE SIZE OF ABOUT 0.007 TO ABOUT 0.012 MICRONS SELECTED FROM THE GROUP CONSISTING OF SILICA AND ALUMINA, (2) A CURED THERMOSETTING RESIN SELECTED FROM THE GROUP CONSISTING OF AMINO RESINS, POLYESTER RESINS, EPOXY RESINS AND PHENOLIC RESINS, AND (3) A HYDROXYLMODIFIED VINYL CHLORIDE-VINYL ACETATE COPOLYMER AND (B) A POLYMERIC BINDER RESIN SELECTED FROM THE GROUP CONSISTING OF CELLULOSE TRACETATE, CELLULOSE ACETATE BUTYRATE, CELLULOSE ACE TATE PROPIONATE, POLYVINYL CHLORIDE ACETATE, POLYSTYRENE, POLYETHYLENE TEREPHTHALATE AND BISPHENENOL-A-POLYCARBONATE, SAID BACKWET COMPOSITION BEING COATED FROM AN ORGANIC SOLVENT CONTAINING COATING COMPOSITION, SAID SOLVENT HAVING A BOILING POINT BELOW ABOUT 140*C WHEREIN SAID BINDER SAID RESINS AND SAID COPOLYMER BEING DISSOLVED IN SAID COATING COMPOSITION, AND SAID POLYMERIC FILM BASE SUPPORT BEING THE SAME POLYMER AS SAID POLYMERIC BINDER RESIN.
Claim 3
Dependent Claim
34 words
An element as defined in claim 1 wherein said element is disposed in layered assemblies in such a manner that said sensitized side is in at least close proximity to said backwet coated side.
Claim 4
Dependent Claim
13 words
A photographic element as defined in claim 1 wherein said element is microfilm.