Negative type lithographic printing plate

Details Negative type lithographic printing plate Negative type lithographic printing plate

1991-10-10

1993-12-21

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Silver halide colloid tanning process, composition, or product

430204, 430248, 430249, 430230, G03C 832

Patent

active

052720411

ABSTRACT:
The present invention provides a method for obtaining a negative type lithographic printing plate comprising the steps of (i) image-wise exposing a diffusion transfer reversal imaging element comprising a direct positive silver halide emulsion that mainly forms an internal latent image and a layer containing physical development nuclei, (ii) fogging said image-wise exposed imaging element, (iii) developing said imaging element using a surface developer, (iv) transfering the undeveloped silver salts in the non-exposed areas to said layer containing physical development nuclei and (v) image-wise depositing said silver salts on said physical development nuclei in the presence of physical development restraining compound(s).

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