Negative lithographic printing plates having a semisolid radiation-sensitive layer
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United States of America Patent
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Apr 1, 2003
Grant Date -
Feb 20, 2003
app pub date -
Jun 4, 2001
filing date -
Jun 4, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This patent describes a lithographic printing plate comprising on a substrate a semisolid radiation-sensitive layer capable of hardening upon exposure to a suitable radiation, and a method of imaging such a plate using laser radiation. The utilization of a semisolid radiation-sensitive layer allows faster photospeed and better curing efficiency as desired for digital laser exposure. Several plate designs can be utilized to overcome the tackiness issue associate with the semisolid layer, such as conformally coating the radiation-sensitive layer on a rough substrate and utilizing an overcoat. Plates having an ink and/or fountain solution or dispersible semisolid radiation-sensitive layer can be directly developed with ink and/or fountain solution while solution while mounted on press, with the imagewise laser exposure being carried out on press or off press.
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