Photosensitive, flexo printing element and method for the production of newspaper flexo printing plates
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United States of America Patent
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Jun 26, 2007
Grant Date -
Sep 30, 2004
app pub date -
Jul 18, 2002
filing date -
Aug 3, 2001
priority date (Note) -
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Abstract
The present invention relates to a photosensitive flexographic printing element for the production of flexographic newspaper printing plates, comprising at least a flexible, metallic support, an adhesive layer applied thereto, a photopolymerizable layer which can be developed in organic media and which itself comprises at least one elastomeric binder, ethylenically unsaturated monomers, a photoinitiator or photoinitiator system and a plasticizer, a transparent substrate layer, and optionally a removable protective film, where the total thickness of the flexographic printing element is from 300 to 1000 .mu.m, the elastomeric binder has a weight average molecular weight M.sub.w of from 80,000 to 150,000 g/mol and a Shore A hardness of from 50 to 80, and the amount of plasticizer is from 5 to 50% by weight, based on the amount of all constituents of the photopolymerizable layer, and to a process for the production of flexographic newspaper printing plates by imagewise exposure of the flexographic printing element to actinic light, followed by development and drying at from 105 to 160.degree. C.
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