Process for the preparation of a novel pigmented composition for use in offset inks
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United States of America Patent
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Aug 24, 2010
Grant Date -
Mar 12, 2009
app pub date -
Apr 24, 2006
filing date -
May 2, 2005
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Expired
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Abstract
The invention pertains to a novel, simpler dry-milling method for comminuting crude pigments (especially crude phthalocyanines) for use in offset inks, wherein a high amount of resin is used, at least part of which is a low molecular phenol-modified rosin, an esterified rosin or a hydrocarbon resin of similar properties, preferably together with an antioxidant, and dry-milling is performed at relatively low temperature. The invention also pertains to the thus obtained, new compositions, which are extraordinarily easily dispersible in hydrocarbon solvents, and their use for the preparation of inks or ink concentrates. Pigment dispersions obtained from the preferred compositions are also claimed.
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