Multilayer photographic support material

Claim 1

A method for preparing a multilayer photographic support material using at least one coating mixture and accelerated electron radiation to provide a smooth unmottled surface, wherein harmful reactive products that remain after exposure to the accelerated electron radiation are rendered inert to a photographic silver halide emulsion subsequently applied onto said surface, comprising in combination: applying to at least one surface of a photographic base paper a liquid acrylic coating mixture consisting essentially of liquid acrylic acid esters containing two or more C═C double bonds and characterized by molecular weights of about 1000 or less, hardenable by electron radiation; and containing a pigment, hardening said liquid acrylic coating mixture in a polymerization reaction by irradiation with accelerated electrons at substantially room temperature in an inert gas atmosphere or covered with an inert solid material to polymerize a layer of acrylic polymer onto said surface, said layer of acrylic polymer including harmful reactive products that remain after the exposure to electron radiation, and said acrylic layer further including a hardening surface, subjecting said hardened surface to oxidizing treatment selected from the group consisting of corona, flame, ozone, ultraviolet radiation or wet oxidizing chemical treatment to facilitate adhesion to a subsequent coating, melt extrusion coating onto said treated hardened surface a film of pigmented polyolefin resin; and applying onto the polyolefin resin a coating that includes a silver-halide photographic emulsion.

Claim 2

A method for preparing a multilayer photographic support material using at least one coating mixture and accelerated electron radiation to provide a smooth unmottled surface, wherein harmful reactive products that remain after exposure to the accelerated electron radiation are rendered inert to a photographic silver halide emulsion subsequently applied onto said surface, comprising in combination: applying to at least one surface of a photographic base paper a liquid acrylic coating mixture consisting essentially of liquid acrylic acid esters containing two or more C═C double bonds and characterized by molecular weights of about 1000 or less, hardenable by electron radiation; and containing a pigment, hardening said liquid acrylic coating mixture in a polymerization reaction by irradiation with accelerated electrons at substantially room temperature in an inert gas atmosphere or covered with an inert solid material to polymerize a layer of acrylic polymer onto said surface, said layer of acrylic polymer including harmful reactive products that remain after the exposure to electron radiation, and said acrylic layer further including a hardening surface, subjecting said hardened surface to oxidizing treatment selected from the group consisting of corona, flame, ozone, ultraviolet radiation or wet oxidizing chemical treatment to facilitate adhesion to a subsequent coating, melt extrusion coating onto said treated hardened surface a film of pigmented polyolefin resin; and applying onto the polyolefin resin a coating that includes a silver-halide photographic emulsion.