Photosensitive compositions comprising photosensitive polyfunctional aromatic diazo compounds, and presensitized lithographic plates formed with the same
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United States of America Patent
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Dec 31, 1996
Issued Date -
N/A
app pub date -
Jan 6, 1995
filing date -
Jul 24, 1992
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Expired
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Abstract
A photosensitive composition containing a polyfunctional aromatic diazo compound having at least two groups of Formula (uD) in the molecule, and a photosensitive composition using the same. The diazo compound can be handled under visible light free from ultraviolet, is highly photosensitive, has good shelf life, and lithographic printing plates and screen printing plates formed with the same: ##STR1## wherein G.sup.1 is a substituent derived from alcoholic hydroxyl group; R.sup.1 and R.sup.2 are hydrogen, or alkyl or alkyloxy of 1 to 8 carbon atoms; R.sup.3 is alkyl or substituted alkyl of 1 to 8 carbon atoms, aralkyl or substituted aralkyl of 7 to 14 carbon atoms, or --CH.sub.2 CHG.sup.2 --CH.sub.2 --; X.sup.- is an anion based on protonic acid from which a proton is removed.
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