Printing plate protectant
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United States of America Patent
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-
Jun 4, 1991
Grant Date -
N/A
app pub date -
Oct 5, 1990
filing date -
Oct 5, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A composition useful for the protection of actinic light-exposed presensitized lithographic printing plates. The composition contains an effective amount of the di-potassium salt of hydroxyethylidene diphosphonic acid dissolved in water. The composition is applied to the surface of the revealed substrate of the plates after they have been developed but before treatment to heat, to prevent surface contamination from the heat treatment.
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