Method for reducing start up blinding in no-process...

Details Method for reducing start up blinding in no-process... Method for reducing start up blinding in no-process...

2005-01-18

2005-01-18

Schilling, Richard L. (Department: 1752)

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Making printing plates

C430S303000, C430S309000, C430S964000, C101S451000, C101S467000

Reexamination Certificate

active

06844140

ABSTRACT:
A method for reducing start up blinding in no-process lithographic printing plates is disclosed. An imageable element, comprising an imageable layer over a substrate, is thermally imaged. The imageable layer comprises a thermally sensitive polymer that comprises quaternary ammonium salts of carboxylic acids. Following imaging, the surface of the imaged imageable is contacted with an aqueous solution comprising 0.05 wt % to about 5 wt % of an added organic acid having a pKa of about 1 to about 6. This reduces the amount of waste produced by the printing process by reducing the number of unusable sheets produced during the “make ready” process.

REFERENCES:
patent: 5713287 (1998-02-01), Gelbart
patent: 6365705 (2002-04-01), Leon
patent: 6447978 (2002-09-01), Leon et al.
patent: 20020142247 (2002-10-01), Kawamura et al.

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