Imaging element and method for making a lithographic printing pl

Radiation imagery chemistry: process – composition – or product th – Transfer procedure between image and image layer – image... – Diffusion transfer process – element – or identified image...

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430229, 430234, 430249, 430436, 430440, 430480, G03C 142, G03C 530, G03C 806, G03C 836

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active

057337039

ABSTRACT:
The present invention provides an imaging element comprising on a support in the order given a photosensitive layer comprising a silver halide emulsion and an image receiving layer containing physical development nuclei in water permeable relationship with said emulsion layer, characterized in that said imaging element comprises at least 50 mg/m.sup.2 of tetramethyl reductic acid and at least 100 mg/m.sup.2 of ascorbic acid.
According to the present invention there is further provided a method for making a lithographic printing plate comprising the steps of image-wise exposing an imaging element as defined above and subsequently developing a thus obtained imaging element by an alkaline processing liquid in the presence of developing agent(s) and silver halide solvent(s).

REFERENCES:
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patent: 3821000 (1974-06-01), Land et al.
patent: 3870479 (1975-03-01), Kubotera et al.
patent: 4535051 (1985-08-01), Simon et al.
patent: 4585725 (1986-04-01), Sakaguchi
patent: 5268253 (1993-12-01), Van Rompuy
patent: 5578434 (1996-11-01), Moizo et al.
patent: 5648205 (1997-07-01), Okutsu

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