Method for treating a lithographic printing plate
AssigneeAgfa Graphics NV
InventorsPeter Maessen, Hubertus Van Aert
Life of this patent
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Abstract
A method for treating a lithographic printing plate including the step of applying a liquid containing a surfactant to the plate, characterized in that the surfactant includes at least one hydrophilic segment including polyglycerol, and at least one hydrophobic segment selected from an optionally substituted alkylene group, an alkyl or aryl substituted poly(meth)acrylate, an optionally substituted polyester, polyether, polyurethane, polycarbosilane, polysiloxane, polystyrene and/or a polymer including a perfluoroalkyl group with the proviso that the liquid is not applied as a fountain solution.
Claims8
A method for treating a heat-sensitive lithographic printing plate comprising the steps of:
- obtaining a printing plate by exposing to infrared light and developing a printing plate precursor including a coating including an infrared absorbing compound and an oleophilic resin which is soluble in an aqueous alkaline developer;
- and
- applying a liquid containing a surfactant to the printing plate, and the step of applying the liquid to the printing plate does not include applying the liquid as a fountain solution;
- wherein
- the surfactant includes at least one hydrophilic segment including polyglycerol, and at least one hydrophobic segment selected from an optionally substituted alkylene group, an alkyl or aryl substituted poly(meth)acrylate, an optionally substituted polyester, polyether, polyurethane, polycarbosilane, polysiloxane, polystyrene and/or a polymer including a perfluoroalkyl group;
- and
- the liquid does not chemically attack image areas on the printing plate.
Dependencies are inferred from the claim text.