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Abstract

Multilayer, positive working, thermally imageable, bakeable imageable elements have a substrate, an underlayer, and a top layer. The underlayer comprises a polymeric material that comprises, in polymerized form from about 5 mol % to about 30 mol % of recurring units derived from an ethylenically unsaturated polymerizable monomer having a carboxy group; from about 20 mol % to about 75 mol % of recurring units derived from N-phenylmaleimide, N-cyclohexylmaleimide, N-benzylmaleimide, or a mixture thereof; and from about 3 mol % to about 50 mol % of recurring units derived from a compound represented by the formula: CH.sub.2.dbd.C(R.sub.2)--C(O)--NH--CH.sub.2--OR.sub.1, in which R.sub.1 is C.sub.1 to C.sub.12 alkyl, phenyl, C.sub.1 to C.sub.12 substituted phenyl, C.sub.1 to C.sub.12 aralkyl, or Si(CH.sub.3).sub.3; and R.sub.2 is hydrogen or methyl. Other materials, such as a resin or resins having activated methylol and/or activated alkylated methylol groups, such as a resole resin, may be present in the underlayer. The elements can be used to produce bakeable lithographic printing plates that are resistant to press chemistries.

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First Claim