Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Making printing plates
Reexamination Certificate
2007-12-31
2010-11-09
Kelly, Cynthia H (Department: 1795)
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Making printing plates
C430S309000, C430S301000, C101S463100
Reexamination Certificate
active
07829260
ABSTRACT:
A method of treating a laser exposed lithographic printing plate with a deactivating solution followed by overall irradiation is described. The plate comprises on a substrate a photosensitive layer capable of photo hardening. The deactivating solution is capable of deactivating the photo hardening capability of the photosensitive layer in the non-hardened areas so that the overall irradiation does not cause hardening of the photosensitive layer in the non-hardened areas. The deactivation and overall irradiation cause one or more chemical or physical changes to the photosensitive layer, such as further hardening of the imaged areas, improved contrast, improved developability, or improved substrate hydrophilicity. The overall irradiated plate is further developed on press with ink and/or fountain solution or off press with a developer. For off-press development, the developer may be used as the deactivating solution.
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Kelly Cynthia H
Robinson Chanceity N
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