Thermal transfer donor and receptor for lithographic printing applications

An image receiving element comprising a substrate having a photopolymer layer on at least one major surface thereof, said substrate having a microporous hydrophilic crosslinked silicated surface comprising a colloidal silica crosslinked by a coupling agent, said photopolymer layer comprising photopolymer described by the following formula:

• ##STR10## wherein:
• R.sup.1 independently is hydrogen or methyl;
• R.sup.2 is represented by ##STR11## wherein:
• n is 0 or 1;
• and
• R.sup.5, R.sup.6, R.sup.7, and R.sup.8 are each independently an alkyl group having 1 to 12 carbon atoms or a cycloalkyl group having 5 to 12 carbon atoms, an aryl or aralkyl group having 6 to 12 carbon atoms, or at least one of the pairs R.sup.5 and R.sup.6, or R.sup.7 and R.sup.8, taken together with the carbon to which it is joined forms a 5- or 6-membered carbocyclicy ring, or any of R.sup.5, R.sup.6, R.sup.7, and R.sup.8 may be H;
• W is --NH--, --NR.sup.20, --S--, or --O--, wherein R.sup.2.degree. is an alkyl group having 1 to 12 carbon atoms;
• and
• Z is represented by ##STR12## wherein R.sup.5, R.sup.6, R.sup.7, R.sup.8, and n are as previously described;
• R.sup.3 is a polymerizable, ethylenically unsaturated group selected from ##STR13## wherein:
• R.sup.9 is an alkylene group having 1 to 12 carbon atoms, an arylene group having 6 to 10 carbon atoms, an oxyalkylene group or a poly(oxyalkylene) in which said alkylene group has 2 to 4 carbon atoms and the number of oxygen atoms is a positive integer less than or equal to four;
• R.sup.10 is hydrogen, cyano, a carboxyl group, or a --C(.dbd.O)NH.sub.2 group;
• and
• R.sup.11 is hydrogen, an alkyl group having 1 to 12 carbon atoms, or a phenyl group or naphthyl group;
• or
• (ii) --R.sup.9 --W--T;
• wherein:
• R.sup.9 is as defined in (i);
• W is as previously defined;
• and
• T is an ethylenically unsaturated group selected from the group consisting of allyl, vinyl, acryloyl, methacryloyl, cinnamoyl, maleoyl, fumaroyl, itaconoyl, and crotonoyl;
• a, b, c, and d are independently integers, wherein a and b are at least 1, and the sum of a+b+c+d is sufficient to provide a polymer having a number average molecular weight in the range of 2,000 to 2,000,000 Daltons;
• G is represented by --R.sup.9 --N.sup.+ R.sup.12 R.sup.13 R.sup.14 X.sup.- ;
• wherein:
• R.sup.9 is as previously defined;
• and
• R.sup.12 -R.sup.14 are each independently an alkyl group having 1 to 24 carbon atoms or a cycloalkyl group having 5 to 12 carbon atoms, an aryl or aralkyl group having 6 to 12 carbon atoms, or any two or all three of R.sup.12 -R.sup.14 taken together with the nitrogen to which they are joined form a 5- to 8-membered heterocyclic ring;
• and
• X.sup.- represents any non-interfering anion;
• R represents an aryl group having 6 to 30 carbon atoms, cyano, --CO.sup.2 H, carboalkoxy group having 2 to 40 carbon atoms, or a mono- or dialkylcarbamoyl group having 2 to 40 carbon atoms;
• and
• R.sup.4 represents hydrogen, a solubilizing cation, or --E--A;
• wherein:
• E represents an organic divalent connecting group having up to a total of about 18 C, N, S, and nonperoxidic O atoms;
• and
• A is an organic or inorganic acid or salt thereof.