Method of making planographic printing plate and planographic printing plate
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United States of America Patent
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Jul 28, 2015
Grant Date -
Oct 3, 2013
app pub date -
Feb 1, 2013
filing date -
Mar 30, 2012
priority date (Note) -
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Abstract
A method of making a planographic printing plate includes exposing, to infrared light, a planographic printing plate precursor including a recording layer provided on a substrate, and developing the precursor using an aqueous alkaline solution. The recording layer comprises a copolymer containing a structural unit derived from (meth)acrylonitrile and at structural unit derived from styrene, a water-insoluble and alkali-soluble resin, and an infrared absorbing agent, the solubility of the recording layer in the aqueous alkaline solution being increased by the exposure. The aqueous alkaline solution has a pH of 8.5 to 10.8 and contains a betaine-based amphoteric surfactant and an ammonium salt represented by Formula (I):
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