Method for obtaining a lithographic printing surface using a metal complex
First Claim
1. ) a method for obtaining a lithographic printing surface comprising the steps of:
- a) image-wise or information-wise exposing to radiation a thermally convertible lithographic printing precursor comprising i) a hydrophilic lithographic base, ii) a radiation sensitive coating on at least one surface of said hydrophilic lithographic base, said coating comprising within at least one layer (1) uncoalesced particles of at least one hydrophobic thermoplastic polymer and (2) at least one metal complex and (3) at least one converter substance capable of converting radiation into heat b) developing said exposed thermally convertible lithographic printing precursor with an aqueous medium in order to remove the unexposed parts of said coating.
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Accused Products
Abstract
In accordance with the present invention there is provided an imaging element for lithographic offset printing. The imaging element comprises hydrophobic polymer particles in an aqueous medium, a substance for converting light into heat, and a metal complex. The imaging element may be used for printing long run lengths on lower quality paper and in the presence of set-off powder. The imaging element may be imaged and developed on-press and may be sprayed onto a hydrophilic surface to create a printing surface that may be processed wholly on-press. The hydrophilic surface may be a printing plate substrate, the printing cylinder of a printing press, or a seamless sleeve around the printing cylinder of a printing press. This cylinder may be conventional or seamless.
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Citations
17 Claims
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1. ) a method for obtaining a lithographic printing surface comprising the steps of:
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a) image-wise or information-wise exposing to radiation a thermally convertible lithographic printing precursor comprising i) a hydrophilic lithographic base, ii) a radiation sensitive coating on at least one surface of said hydrophilic lithographic base, said coating comprising within at least one layer (1) uncoalesced particles of at least one hydrophobic thermoplastic polymer and (2) at least one metal complex and (3) at least one converter substance capable of converting radiation into heat b) developing said exposed thermally convertible lithographic printing precursor with an aqueous medium in order to remove the unexposed parts of said coating. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification