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US 12,226,997 B2Granted
Lithographic photopolymer printing plate precursor with improved daylight stability
AssigneeEco3 BV
InventorsKatleen Himschoot, Eva Vermeiren, Thomas Billiet, Fabienne Goethals
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Abstract
A lithographic printing plate precursor is disclosed which comprises a support, a photopolymerizable image recording layer and an overcoat which comprises a low-molecular radical inhibitor. After image-wise exposure, the plate is heated whereby the radical inhibitor diffuses from the overcoat to the image recording layer, resulting in an increase of the daylight stability of the exposed and heated precursor. Such plate is especially suitable for on-press processing.
Claims18
A lithographic printing plate precursor comprising a support and provided thereon, in order,
- a negative working image recording layer which undergoes a free-radical polymerization or crosslinking reaction upon exposure to ultraviolet, violet, or infrared light and
- an overcoat which comprises (a) a low-molecular radical inhibitor, which is an organic compound having a molecular weight of less than 1000 Dalton, or (b) a polymer which releases a low-molecular radical inhibitor, which is an organic compound having a molecular weight of less than 1000 Dalton, upon heating, wherein the low-molecular radical inhibitor is present or released in the overcoat in an amount of at least 10 mg/m2,
- characterized in that upon heating said low-molecular radical inhibitor is capable of diffusing to the image recording layer, thereby rendering the image recording layer less sensitive to daylight than before said heating.
Dependencies are inferred from the claim text.