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US 7,255,976 B2Granted
Laser-engravable flexo printing elements for the production of flexo printing forms containing blends of hydrophilic polymers and hydrophobic elastomers
AssigneeXSYS Print Solutions Deutschland GmbH
InventorsMargit Hiller, Jens Schadebrodt, Jürgen Kaczun, Thomas Telser, Wolfgang Wenzl
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Abstract
Laser-engravable flexographic printing elements for the production of flexographic printing plates have relief layers comprising blends of hydrophilic polymers and hydrophobic elastomers. Said flexographic printing elements are used for the production of flexographic printing plates by means of laser engraving.
Claims17
A laser-engravable flexographic printing element for the production of flexographic printing plates, at least comprising
- a dimensionally stable substrate,
- a laser-engravable elastomeric, crosslinked relief layer, obtainable by uniform crosslinking of a crosslinkable relief layer which comprises at least two polymeric binders and components for crosslinking,
- wherein the at least two polymeric binders comprise a blend of at least one hydrophilic polymer and at least one hydrophobic elastomer, said at least one hydrophilic polymer comprising a polymer comprising a vinyl alcohol unit, and the weight ratio of hydrophilic polymer to hydrophobic elastomer is from 1:99 to 30:70, hydrophilic polymers prepared by means of emulsion polymerization being excluded.
A laser-engravable flexographic printing element for the production of flexographic printing plates, at least comprising
- a dimensionally stable substrate,
- a laser-engravable elastomeric, crosslinked relief layer, obtainable by uniform crosslinking of a crosslinkable relief layer which comprises at least two polymeric binders and components for crosslinking,
- wherein the at least two polymeric binders comprise a blend of at least one hydrophilic emulsion copolymer having a core/shell structure and containing from 35 to 98% by weight of at least one of a conjugated diene and an elastomeric acrylate, from 2 to 40% by weight of at least one monoolefinic hydrophilic monomer and from 0 to 60% by weight of other monomers having olefinic groups, and
- at least one hydrophobic elastomer and the weight ratio of hydrophilic emulsion copolymer to hydrophobic elastomer is from 1:99 to 75:25.
1 more element
Dependencies are inferred from the claim text.