This disclosure is directed to a plate design for use in variable data digital lithographic image forming devices. The disclosed plate design incorporates surface passivated carbon black filler material particles in a fluorosilicone polymer. The disclosed functionalized carbon black material compositions include hydrophobic carbon black particles passivated with polymerized pentafluorostyrene. The disclosed surface passivated carbon black particles have a diameter in a range of 50 nanometers to 1 micron, and enable enhances dispersion in fluorinated polymers, and fine dispersion in solvent. The disclosed surface passivated carbon black particles are particularly usable for improving operational characteristics of fluorosilocone-based reimageable surface layers of imaging members employed in the variable data digital lithographic image forming devices.

A method of preparing a printing form precursor for printing, or a printed circuit board precursor or a semiconductor precursor, the method comprising the step of applying electromagnetic radiation having a pulse duration of not greater than 110.sup.6 seconds, in an imagewise manner, to an imagable surface of the precursor. The imaging process may cause ablation of the coating of the precursor or permit its development in a developer. In each case the imaging radiation needs not be tuned to imaging chemistry (if any) present in the coating. Alternatively the imaging process may induce a change of hydrophilicity or hydrophobicity, or other change of state, of an uncoated substrate.

Provided are an on-press development type lithographic printing plate precursor including: a support; and an image-recording layer on the support, in which the image-recording layer contains an electron-accepting polymerization initiator, an electron-donating polymerization initiator, an infrared absorber, and a salt compound A, and an HOMO value of an anion constituting a salt in the salt compound A is 6.2 eV or more and 4.4 eV or less, and a method of preparing a lithographic printing plate or a lithographic printing method using the on-press development type lithographic printing plate precursor.

Provided are an on-press development type lithographic printing plate precursor including: a support; and an image-recording layer on the support, in which the image-recording layer contains an electron-accepting polymerization initiator, an electron-donating polymerization initiator, an infrared absorber, and a salt compound A, and an HOMO value of an anion constituting a salt in the salt compound A is 6.2 eV or more and 4.4 eV or less, and a method of preparing a lithographic printing plate or a lithographic printing method using the on-press development type lithographic printing plate precursor.

An on-press development type lithographic printing plate precursor includes: a support; and an image-recording layer on the support, in which the image-recording layer contains a compound represented by Formula (1), a method of preparing a lithographic printing plate using the on-press development type lithographic printing plate precursor, a lithographic printing method, and a novel compound. In the formula, R.sup.1 represents a group represented by Formula (2) or Formula (3), R.sup.10 represents a monovalent organic group having an aryl group, R.sup.11 to R.sup.14 and R.sup.17 to R.sup.20 each independently represent a hydrogen atom, an alkyl group, or an aryl group, R.sup.15 and R.sup.16 each independently represent a hydrogen atom, an alkyl group, or an aryl group, and at least two of R.sup.11 to R.sup.20 may be bonded to each other to form a ring structure.

##STR00001##

An on-press development type lithographic printing plate precursor includes: a support; and an image-recording layer on the support, in which the image-recording layer contains a compound represented by Formula (1), a method of preparing a lithographic printing plate using the on-press development type lithographic printing plate precursor, a lithographic printing method, and a novel compound. In the formula, R.sup.1 represents a group represented by Formula (2) or Formula (3), R.sup.10 represents a monovalent organic group having an aryl group, R.sup.11 to R.sup.14 and R.sup.17 to R.sup.20 each independently represent a hydrogen atom, an alkyl group, or an aryl group, R.sup.15 and R.sup.16 each independently represent a hydrogen atom, an alkyl group, or an aryl group, and at least two of R.sup.11 to R.sup.20 may be bonded to each other to form a ring structure.

##STR00001##