PROCESS FOR PRODUCING INK COMPOSITION FOR OFFSET PRINTING, AND INK COMPOSITION FOR OFFSET PRINTING PRODUCED BY SAID PRODUCTION PROCESS
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United States of America Patent
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Issued Date -
Jan 29, 2009
app pub date -
Mar 10, 2006
filing date -
Mar 22, 2005
priority date (Note) -
Abandoned
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Abstract
The present invention aims to provide a method of producing an ink composition for offset printing, which can improve the productivity of inks considerably while using a neutral carbon black and in which the printing quality of printed substances obtained by using the ink obtained by the method to perform sheet-fed printing is higher than that of printed substances using an acid carbon black, and an ink composition for offset printing prepared by the production method. The present invention pertains to a method of producing an ink composition for offset printing, including the steps of wetting 300 parts by mass of a neutral carbon black with 100 to 900 parts by mass of a wetting agent containing at least water, using an oil-based varnish for a printing ink containing an alkyd resin having an acid value of 30 KOH mg/g or less to perform flushing of the foregoing wetted neutral carbon black, and then removing the wetting agent.
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