Lithographic printing plate precursors and stacks
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United States of America Patent
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Feb 26, 2013
Grant Date -
Mar 3, 2011
app pub date -
Aug 25, 2009
filing date -
Aug 25, 2009
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Abstract
Lithographic printing plate precursors have been designed so that they can be stored, shipped, and used in stacks without interleaf paper between individual precursors. This is achieved by incorporating polymeric particles having an average diameter of from about 3 to about 20 μm into the outermost precursor layer such as an imagable layer or topcoat. The polymeric particles comprise a core of a crosslinked polymer and have grafted hydrophilic polymeric surface groups that are grafted onto the particle surfaces by polymerizing hydrophilic monomers in the presence of the crosslinked polymeric particles. The lithographic printing plates can be either negative- or positive-working elements.
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