Water-soluable rosin-based coatings and inks
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United States of America Patent
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Apr 14, 1992
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N/A
app pub date -
Aug 9, 1991
filing date -
Aug 9, 1991
priority date (Note) -
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Abstract
Stable pigmented coating composition, suitable as a package coating varnish or ink, including newsprint ink or rotogravure ink, comprises a suspension of at least 10 weight % pigment in an aqueous solution of at least 5 weight % water soluble modified rosin, the water-soluble modified rosin having an acid number of at least 150 and comprising the reaction product of rosin, formaldehyde and at least one of an ortho- or para-carboxyl-substituted phenol. The weight ratio of pigment to resin is from 5:1 to 1:5.
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