Photosensitive materials
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United States of America Patent
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Mar 18, 1986
Issued Date -
N/A
app pub date -
Mar 12, 1985
filing date -
Jul 28, 1980
priority date (Note) -
Expired
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Abstract
A presensitized plate adapted for use in lithography comprising a support member with a metal surface, e.g. aluminum metal, and overlying layer containing a diazo compound. In accordance with this invention, the relative exposure sensitivity of the diazo compound is improved by pretreatment to accelerate its reactivity in the presence of actinic light. One method of pretreatment involves preheating the diazo compound to a temperature above about 35.degree. C. up to about 120.degree. C. The improved lithographic plate and the process of preparing plate are claimed.
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