Photographic method employing organic light-scattering particles for producing a viewing-screen structure

Claim 1

A method for producing a luminescent screen structure including the steps of a. coating a supporting surface with a film consisting essentially of (i) organic polymeric binder material whose solubility in a given solvent is altered when it is exposed to radiant energy, said binder material being volatilized when heated in air below about 500°C and (ii) about 10 to 80 weight percent with respect to the weight of said binder material of particles of an organic material that is insoluble in said binder material and selected from the group consisting of acrylic and polystyrene polymers, said particles being volatilized when heated in air at temperatures below about 500°C and being about 0.3 to 1.0 micron median size, said organic particles being adapted to scatter said radiant energy in said film, b. exposing said film to an image in the form of said radiant energy until the solubility of the irradiated portions thereof is selectively altered, thereby producing in said film regions of greater solubility and regions of lesser solubility, c. removing those regions of said film with greater solubility with a liquid solvent therefor while retaining said regions with lesser solubility, thereby baring the areas of said supporting surface underlying said regions of greater solubility, while retaining those regions of said film of lesser solubility, d. then, while said retained film regions are wet with said solvent, adhering dry particles of screen-structure material to said film regions of lesser solubility, e. and then baking said retained film regions with said adhered particles thereon in air at temperatures below about 500°C until said binder material and said organic particles are substantially entirely volatilized.

Claim 2

A method for producing a luminescent screen structure including the steps of a. coating a supporting surface with a film consisting essentially of (i) organic polymeric binder material whose solubility in a given solvent is altered when it is exposed to radiant energy, said binder material being volatilized when heated in air below about 500°C and (ii) about 10 to 80 weight percent with respect to the weight of said binder material of particles of an organic material that is insoluble in said binder material and selected from the group consisting of acrylic and polystyrene polymers, said particles being volatilized when heated in air at temperatures below about 500°C and being about 0.3 to 1.0 micron median size, said organic particles being adapted to scatter said radiant energy in said film, b. exposing said film to an image in the form of said radiant energy until the solubility of the irradiated portions thereof is selectively altered, thereby producing in said film regions of greater solubility and regions of lesser solubility, c. removing those regions of said film with greater solubility with a liquid solvent therefor while retaining said regions with lesser solubility, thereby baring the areas of said supporting surface underlying said regions of greater solubility, while retaining those regions of said film of lesser solubility, d. then, while said retained film regions are wet with said solvent, adhering dry particles of screen-structure material to said film regions of lesser solubility, e. and then baking said retained film regions with said adhered particles thereon in air at temperatures below about 500°C until said binder material and said organic particles are substantially entirely volatilized.