Negative-working imageable elements
AssigneeEastman Kodak Company
InventorsBernd Strehmel, Harald Baumann, Daniela Lummel
Life of this patent
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Abstract
Negative-working imageable element can be used to prepared lithographic printing plates. These elements include a water-soluble contrast dye having a λmax in the range of from about 450 to about 750 nm and having an absorption that is lower than 10% with respect to the absorption of the radiation absorbing compound in the element at the wavelength used for exposure. The contrast dye is present in sufficient H-aggregation such that less than 40% of the entire absorption spectrum from the contrast dye is contributed by it in non-H-aggregated form.
Claims19
A negative-working imageable element comprising a substrate having thereon an imageable layer comprising:
- a free radically polymerizable component,
- an initiator composition capable of generating radicals sufficient to initiate polymerization of said free radically polymerizable component upon exposure to imaging radiation,
- a radiation absorbing compound,
- a polymeric binder, and
- a water-soluble contrast dye having a λmax in the range of from about 450 to about 750 nm and having an absorption that is lower than 10% with respect to the absorption of said radiation absorbing compound at the wavelength used for exposure, said contrast dye being present in sufficient H-aggregation such that less than 40% of the entire absorption spectrum from said contrast dye is contributed by said contrast dye in non-H-aggregated form.
Dependencies are inferred from the claim text.