Negative-working thermal imaging member and methods of imaging and printing
AssigneeEastman Kodak Company
InventorsDavid B. Bailey, Charles W. Lander
Life of this patent
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Abstract
A negative-working imaging member can be used as a lithographic printing plate without ablation. The imaging member comprises a support and an imaging layer that includes a dispersion of at least 0.05 g/m2 of a cyanoacrylate polymer that is thermally degradable below 200° C., a photothermal conversion material that is present in an amount to provide a dry weight ratio to the cyanoacrylate polymer of from about 0.02:1 to about 0.8:1, and a hydrophilic binder to provide a dry weight ratio of a hydrophilic binder to the cyanoacrylate polymer of up to 1:1. Thermal imaging energy causes the exposed areas of the imaging layer to adhere to the support while unexposed areas can be readily washed off and/or simultaneously inked for press runs.
Claims23
A negative-working imaging member comprising a support having thereon a hydrophilic imaging layer comprising a dispersion of at least 0.05 g/m2 of a cyanoacrylate polymer that is thermally degradable below 200° C., a photothermal conversion material that is present in an amount to provide a dry weight ratio to said cyanoacrylate polymer of from about 0.02:1 to about 0.8:1, and a hydrophilic binder to provide a dry weight ratio of said hydrophilic binder to said cyanoacrylate polymer of up to 1:1.
A method of imaging comprising:
- A) spray coating a dispersion comprising at least 0.05 g/m2 of a cyanoacrylate polymer that is thermally degradable below 200° C., a photothermal conversion material that is present in an amount to provide a dry weight ratio to said cyanoacrylate polymer of from about 0.02:1 to about 0.8:1, and a hydrophilic binder to provide a dry weight ratio of said hydrophilic binder to said cyanoacrylate polymer of up to 1:1, onto a support to provide a negative-working imaging member, and
- B) imagewise exposing said imaging member with thermal energy to provide exposed and unexposed areas in said hydrophilic imaging layer of said imaging member, whereby said exposed areas are adhered to said support.
Dependencies are inferred from the claim text.