Visible radiation sensitive composition

An imageable element comprising:

• a support, and
• a photosensitive layer over the support, the photosensitive layer comprising a photosensitive composition comprising:
• at least one ethylenically unsaturated monomer capable of free radical initiated addition polymerization;
• at least one binder, and
• a photoinitiator system comprising a coinitiator and a sensitizer;
• in which:
• the photoinitiator system is present in an amount sufficient to initiate polymerization of the at least one monomer on exposure to actinic radiation:
• the sensitizer has an absorption maximum in the range of 400 nm to 700 nm;
• and
• the sensitizer is a cyanopyridone derivative selected from the group consisting of compounds of Formula I, Formula II, Formula III, Formula IV, and Formula V,
• in which:
• R1 and R2 are each independently hydrogen, or a substituted or unsubstituted alkyl, aryl or aralkyl group;
• X is S or N(R3);
• Y is O, S, Se, N(R3), or C(R4)(R5),
• R3, R4, and R5 are each independently a substituted or unsubstituted-alkyl, aryl or aralkyl group;
• R6, R7, R8, and R9 are each independently hydrogen, a substituted or unsubstituted saturated or unsaturated alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group;
• R10, R11, R12, and R13 are each independently hydrogen, a substituted or unsubstituted saturated or unsaturated alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group, a substituted or unsubstituted amino group, a substituted or unsubstituted oxy group, or R10 and R11, R11 and R12, or R12 and R13 are joined to form a 5- or 6-membered substituted or unsubstituted ring;
• R14, R15, R16, and R17 are each independently hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aralkyl group, halogen, carbalkoxy, a substituted or unsubstituted amino group, a substituted or unsubstituted oxy group, or R14 and R15, or R16 and R17 are joined to form a 5- or 6-membered substituted or unsubstituted ring;
• R18 and R19 are each independently hydrogen, or a substituted or unsubstituted saturated or unsaturated alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group, or R18 and R15 or R19 and R16 are joined to form a 5- or 6-membered substituted or unsubstituted ring, and
• Het is a 5- or 6-membered substituted or unsubstituted heterocyclic ring residue.

A method for forming an image, the method comprising the step of:

• exposing a photosensitive element with radiation in the range of 400 nm to 700 nm;
• in which the imageable element comprises:
• a support, and
• a photosensitive layer over the support, the photosensitive layer comprising a photosensitive composition comprising:
• at least one ethylenically unsaturated monomer capable of free radical initiated addition polymerization;
• at least one binder, and
• a photoinitiator system comprising a coinitiator and a sensitizer;
• in which:
• the photoinitiator system is present in an amount sufficient to initiate polymerization of the at least one monomer on exposure to actinic radiation:
• the sensitizer has an absorption maximum in the range of 400 nm to 700 nm;
• and
• the sensitizer is a cyanopyridone derivative selected from the group consisting of compounds of Formula I, Formula II, Formula III, Formula IV, and Formula V,
• in which:
• R1 and R2 are each independently hydrogen, or a substituted or unsubstituted alkyl, aryl or aralkyl group;
• X is S or N(R3);
• Y is O, S, Se, N(R3), or C(R4)(R5),
• R3, R4, and R5 are each independently a substituted or unsubstituted alkyl, aryl or aralkyl group;
• R6, R7, R8, and R9 are each independently hydrogen, a substituted or unsubstituted saturated or unsaturated alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group;
• R10, R11, R12, and R13 are each independently hydrogen, a substituted or unsubstituted saturated or unsaturated alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group, a substituted or unsubstituted amino group, a substituted or unsubstituted oxy group, or R10 and R11, R11 and R12, or R12 and R13 are joined to form a 5- or 6-membered substituted or unsubstituted ring;
• R14, R15, R16, and R17 are each independently hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aralkyl group, halogen, carbalkoxy, a substituted or unsubstituted amino group, a substituted or unsubstituted oxy group, or R14 and R15, or R16 and R17 are joined to form a 5- or 6-membered substituted or unsubstituted ring;
• R18 and R19 are each independently hydrogen, or a substituted or unsubstituted saturated or unsaturated alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group, or R18 and R15 or R19 and R16 are joined to form a 5- or 6-membered substituted or unsubstituted ring, and
• Het is a 5- or 6-membered substituted or unsubstituted heterocyclic ring residue.

An image, the image prepared by a method comprising the step of:

• exposing a photosensitive element with radiation in the range of 400 nm to 700 nm;
• in which the photosensitive element comprises:
• a support, and
• a photosensitive layer over the support, the photosensitive layer comprising a photosensitive composition comprising:
• at least one ethylenically unsaturated monomer capable of free radical initiated addition polymerization;
• at least one binder, and
• a photoinitiator system comprising a coinitiator and a sensitizer;
• in which:
• the photoinitiator system is present in an amount sufficient to initiate polymerization of the at least one monomer on exposure to actinic radiation:
• the sensitizer has an absorption maximum in the range of 400 nm to 700 nm;
• and
• the sensitizer is a cyanopyridone derivative selected from the group consisting of compounds of Formula I, Formula II, Formula III, Formula IV, and Formula V,
• in which:
• R1 and R2 are each independently hydrogen, or a substituted or unsubstituted alkyl, aryl or aralkyl group;
• X is S or N(R3);
• Y is O, S, Se, N(R3), or C(R4)(R5),
• R3, R4, and R5 are each independently a substituted or unsubstituted alkyl, aryl or aralkyl group;
• R6, R7, R8, and R9 are each independently hydrogen, a substituted or unsubstituted saturated or unsaturated alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group;
• R10, R11, R12, and R13 are each independently hydrogen, a substituted or unsubstituted saturated or unsaturated alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group, a substituted or unsubstituted amino group, a substituted or unsubstituted oxy group, or R10 and R11, R11 and R12, or R12 and R13 are joined to form a 5- or 6-membered substituted or unsubstituted ring;
• R14, R15, R16, and R17 are each independently hydrogen, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aralkyl group, halogen, carbalkoxy, a substituted or unsubstituted amino group, a substituted or unsubstituted oxy group, or R14 and R15, or R16 and R17 are joined to form a 5- or 6-membered substituted or unsubstituted ring;
• R18 and R19 are each independently hydrogen, or a substituted or unsubstituted saturated or unsaturated alkyl group, a substituted or unsubstituted aryl group, or a substituted or unsubstituted aralkyl group, or R18 and R15 or R19 and R16 are joined to form a 5- or 6-membered substituted or unsubstituted ring, and
• Het is a 5- or 6-membered substituted or unsubstituted heterocyclic ring residue.