High resolution, solvent resistant, thin elastomeric printing plates
View Patent ↗The present invention relates a printing element comprising at least one polymer layer which has photoimageable constituents and additions to make the polymer layer either hydrophobic or hydrophilic.
1. A printing form comprising:
a) a substrate
b) a first polymer layer disposed on the substrate wherein the first polymer layer comprises
i) an elastomeric polymer;
ii) an initiator; and
iii) a monomer selected from non-fluorinated acrylate or methacrylate monomers;
c) a second polymer layer disposed on the first polymer layer wherein the second polymer layer comprises
i) an elastomeric polymer;
ii) a photoinitiator; and
iii) a monomer selected from a non-fluorinated acrylate or methacrylate monomers;
wherein either the first or the second polymer layer, but not both, is hydrophilic, and the other polymer layer is hydrophobic, and only the polymer layer that is hydrophobic, but not both, comprises fluorinated additives, in an amount sufficient to render the layer hydrophobic.
2. The printing form of claim 1 wherein the elastomeric polymer is a block copolymer of styrene-butadiene-styrene or styrene-isoprene-styrene.
3. The printing form of claim 1 wherein the first polymer layer and the second polymer layer are crosslinked and each have an elastic modulus in the range of 10 to 100 MPa.
4. The printing form of claim 1 wherein the initiator in the first polymer layer is a photoinitiator or thermal initiator.
5. The printing form of claim 1 , which is a flexographic printing plate.
6. The printing form of claim 1 , which is a gravure printing plate.
7. The printing form of claim 1 wherein the fluorinated additives are fluorosurfactants.