Lithographic fountain solution containing mixed colloids
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United States of America Patent
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Aug 16, 1988
Grant Date -
N/A
app pub date -
Jun 16, 1986
filing date -
Jun 16, 1986
priority date (Note) -
Expired
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Abstract
A lithographic fountain solution concentrate is disclosed, the essential components of which comprises an aqueous mixture of: (a) from about 0.1 to 1.5 percent by weight of a water soluble film forming hydrophilic gum; (b) from about 0.75 to about 8.5 percent by weight of Polyvinyl Pyrrolidone; (c) from about 5.0 to about 30.0 percent by weight of a water soluble acid etchant; (d) from about 20.0 to about 50.0 percent by weight of a water soluble or water miscible glycol; and (e) from about 0.01 to about 1.25 percent by weight of a phosphate/phosphoric acid buffer system. The concentrate is adapted for further dilution by water to yield a fountain solution which when used in the printing process offers decreased scumming and blinding of printing plates while at the same time permitting a reduction in the amount of water applied to the plate. Improved print quality, reduced tendency to wet the paper, faster ink drying and improved ink/water balance is thereby achieved.
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