Planographic printing plate from mercuric ion on silver diffusion transferred image

Abstract

Abstract A PLANOGRAPHIC PRINTING PLATE IS PREPARED FROM SHEET MATERIAL CARRYING AN OUTER HYDROPHILIC COLLOID LAYER THEREON BY CREATING A PATTERN OF FINELY DIVIDED SILVER PARTICLES DISPOSED ESSENTIALLY AT THE SURFACE OF THE COLLOID LAYER AND TREATING THE COLLOID LAYER WITH AN AQUEOUS COMPOSITION CONTAINING MERCURY(II) IONS IN A SUFFICIENT CONCENTRATION OF ABOUT 5-50 GMS. PER LITER TO RENDER THE PATTERN OF SILVER PARTICLES RECEPTIVE TO A HYDROPHOBIC INK. IF NOT ALREADY HARDENED, THE COLLOID LAYER SHOULD BE HARDENED PRIOR TO PRINTING IN ANY CONVENTIONAL WAY IN ORDER TO PRECLUDE TRANSFER OF COLLOID MATERIAL FROM THE LAYER DURING PRINTING. THE PATTERN OF FINELY DIVIDED SILVER PARTICLES AT THE SURFACE OF THE LAYER IS PREFERABLY PRODUCED BY MEANS OF THE KNOWN SILVER COMPLEX DIFFUSION TRANSFER PROCESS, AND THE COLLOID LAYER CAN CONTAIN ONE OR MORE SUBSTANCES OFTEN REFERRED TO AS DEVELOPEMENT NUCLEI FOR PROMOTING THE DEPOSITION ON THE SURFACE THEREOF OF METALLIC SILVER PARTICLES FROM THE DIFFUSING COMPLEXED SILVER HALIDE, OR SUCH SUBSTANCES CAN BE SUPPLIED TO THE LAYER IN OTHER WAYS, SUCH VIA THE DEVELOPMENT BATH.

Inventors

• 👤 Louis Maria De Haes
• 👤 Johannes Josephus Vanheertum
• 👤 Hugo Karel Gevers

Bibliographic Details