Process for preparation of transparencies by selective decomposition of an organoselenium compound in a polymeric matrix

A process for preparation of transparencies comprising:

• a. forming a photoconductive solid phase dispersion of particles of selenium in an insulating polymer matrix by subjecting an insulating film consisting essentially of an organo-selenium compound and an insulating polymer to sufficient electromagnetic and/or thermal energy to effect decomposition of the organo-selenium compound whereby particles of selenium are deposited within the insulating film in substantial conformance with the distribution of the electromagnetic and/or thermal energy throughout the film, the organo-selenium compounds of this film being represented by the formula
• R -- (Se).sub.n -- R.sub.1
• wherein:
• R and R.sub.1 are independently selected from the group consisting of benzyl, alkyl substituted benzyl, alkoxy substituted benzyl, acyl substituted benzyl, amino substituted benzyl, amido substituted benzyl, arylalkyl substituted benzyl, aryl substituted benzyl, alkoxy alkyl substituted benzyl, aryloxy alkyl substituted benzyl, amino alkyl substituted benzyl, hydroxy alkyl substituted benzyl, alkyl amino substituted benzyl, aryl amino substituted benzyl, alkyl carbonyl substituted benzyl, alkyl thio substituted benzyl, alkyl seleno substituted benzyl, carboxamido substituted benzyl, halogen substituted benzyl, carboxyl substituted benzyl, cyano substituted benzyl, and nitro substituted benzyl;
• and
• n is 1 to 4;
• b. forming a latent electrostatic image on the surface of said insulating film;
• c. developing the latent image by bringing said latent image in contact with oppositely charged developer materials;
• d. affixing of the developer materials to the insulating polymeric film;
• and
• e. heating the insulating film to a temperature in a range sufficient to cuase substantial depletion of selenium particles from the insulating polymer matrix.