Printing ink varnish, and printing ink composition using same
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United States of America Patent
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Jul 11, 2017
Grant Date -
Dec 10, 2015
app pub date -
Jan 10, 2014
filing date -
Jan 11, 2013
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Abstract
The present invention relates to an oil-based printing ink varnish comprising a polyurethane prepared using a polymeric polyol and a polyisocyanate as the main structural components, wherein the polyurethane is synthesized using, as a chain extender, a polyfunctional amine which contains at least one secondary amino group in each molecule and in which the total of the number of primary amino groups and the number of secondary amino groups is 3 or more per molecule. The present invention is able to provide a printing ink varnish containing a non-aromatic organic solvent and having excellent laminate strength, blocking resistance, dot reproducibility and plate clogging resistance, as well as a laminate ink containing the varnish.
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