Lithographic plate with disperse particulate rubber additive
AssigneePolaroid Corporation
InventorsChieh-Min Cheng, Anthony C. Giudice, Rong-Chang Liang, William C. Schwarzel, Leonard C. Wan
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Abstract
The present invention discloses the use of rubber and surfactant to enhance the durability and resolution of on-press developable lithographic printing plates. The rubber is preferably incorporated into a photoresist as discrete particulate rubber. To ensure a uniform and stable dispersion, the rubber is suspended in the photoresist by means of a surfactant having an HLB approximately between 7.0 and 18.0.
Claims9
A photoresist composition suitable for use as a photoresist in an on-press developable lithographic printing plate, the photoresist composition comprising in an organic solvent
- a photopolymerizable ethylenically unsaturated monomer having at least one terminal ethylenic group capable of forming a high polymer by free radical initiated, chain-propagated addition polymerization;
- a free-radical generating, addition polymerization-initiating system activatable by actinic radiation;
- a hydrophobic macromolecular organic binder;
- a particulate rubber incorporated into the photoresist composition as a stable dispersion;
- and
- a surfactant having a concentration and an HLB value effective for stably dispersing the particulate rubber.
Dependencies are inferred from the claim text.