Eastman-kodak Company

Livia T Memetea

Jianbing Huang

Heidi M Munnelly

Scott Wertz

A negative-working lithographic printing plate precursor have an outermost imageable layer that includes an oxygen scavenger and shelf-life stabilizer that is represented by either Structure (I) or Structure (II) below:HOOC&#x2014;Ar&#x2014;N(R)(R)&#x2003;&#x2003;(I)HOOC&#x2014;R&#x2014;N(R)(R)&#x2003;&#x2003;(II)wherein Ar is a phenylene or naphthylene group, Rand Rare independently alkyl, alkenyl, alkynyl, phenyl, phenoxy, &#x2014;ROH, &#x2014;CH&#x2014;C(&#x2550;O)&#x2014;R, or &#x2014;CH&#x2014;C(&#x2550;O)O&#x2014;Rgroups, Ris hydrogen or an alkyl or phenyl group, Ris an alkyl or phenyl group, Ris an alkylene group, Rand Rare independently hydrogen or an alkyl, &#x2014;ROH, &#x2014;RC(&#x2550;O)&#x2014;R, or &#x2014;RC(&#x2550;O)ORgroup, Ris hydrogen or an alkyl group, and Ris an alkyl group, provided that the oxygen scavenger has no more than one carboxyl group.

Negative-working lithographic printing plate precursors

Lithographic printing plates can be prepared with enhanced contrast between the image and background by coloring the imaged or exposed regions using a coloring fluid containing a water-insoluble colorant (dye or pigment) and an organic solvent that swells the imaged regions sufficiently for the colorant to be embedded or diffused therein.

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Loveland, CO, United States of America

Livia T Memetea