Macdermid Graphics Solutions, LLC

Eric Lee

Chouaib Boukaftane

A photocurable relief image printing blank comprising: (a) a support layer; (b) one or more photocurable layers disposed on the support layer, wherein the one or more photocurable layers comprise: i) a binder; ii) one or more monomers; iii) an alpha-aminoketone photoinitiator; and optionally, iv) an additive selected from the group consisting of phosphites, phosphines, thioether amine compounds, and combinations of one or more of the foregoing; (c) a laser ablatable masking layer disposed on the one or more photocurable layers, the laser ablatable masking layer comprising a radiation opaque material; and (d) optionally, a removable coversheet. Upon exposure and development, the resulting relief image printing element does not degrade if left under ambient lights for an extended period of time.

Method of improving light stability of flexographic printing plates featuring flat top dots

A method of making a relief image printing element comprising a plurality of relief printing dots. The method includes the steps of imagewise exposing at least one photocurable layer to actinic radiation to selectively crosslink and cure portions of the at least one photocurable layer; and developing the relief image printing element to separate and remove uncrosslinked and uncured portions of the at least one photocurable layer to reveal the relief image therein. The at least one photocurable layer includes a photoinitiator exhibiting a quantum yield of initiation (Qi) of more than 0.05 at a 365 nm wavelength. The substrate has an optical density from 0.5 to 5 in the wavelength range of 365 nm to 450 nm but preferably allows transmission of from 0.1% to 10% of incident light in the wavelength range of 365 nm to 450 nm.

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Woodstock, GA, United States of America

Eric Lee