Negative working, heat-sensitive lithographic printing plate precursor
AssigneeAgfa Graphics NV
InventorsPaul Callant, Hieronymus Andriessen, Alexander Williamson
Life of this patent
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Abstract
A heat-sensitive negative-working lithographic printing plate precursor comprising: a support having a hydrophilic surface or which is provided with a hydrophilic layer; and an image-recording layer comprising hydrophobic thermoplastic polymer particles, an infrared light absorbing dye and a dye; wherein said dye has a specified structure and a most bathochromic light absorption peak between 451 nm and 750 nm.
Claims21
A heat-sensitive negative-working lithographic printing plate precursor comprising:
- (a) a support having a hydrophilic surface or which is provided with a hydrophilic layer;
- and
- (b) an image-recording layer comprising hydrophobic thermoplastic polymer particles, an infrared light absorbing dye and an additional dye according to Formula I:
- wherein
- Q represents an optionally substituted mono-, tri- or penta-methine chain;
- Z and Z′ independently represent O, NR′, S or CH═CH wherein R′ is an optionally substituted alkyl or (hetero)aryl group;
- X and X′ independently represent hydrogen, halogen, O—CH3, an optionally substituted alkyl or (hetero)aryl group, or a condensed benzene ring;
- L and L′ represent a linking group;
- and
- G and G′ represent an acid group or salt thereof;
- and
- wherein the additional dye according to Formula I has a most bathochromic light absorption peak at a wavelength between 451 and 750 nm.
A heat-sensitive negative-working lithographic printing plate precursor comprising:
- (a) a support having a hydrophilic surface or which is provided with a hydrophilic layer;
- and
- (b) an image-recording layer comprising hydrophobic thermoplastic polymer particles, an infrared light absorbing dye and an additional dye according to any of Formulae II to V:
- wherein
- Z and Z′ independently represent 0, NR′, S or CH═CH wherein R′ is an optionally substituted alkyl or (hetero)aryl group;
- X and X′ independently represent hydrogen, halogen, O—CH3, an optionally substituted alkyl or (hetero)aryl group, or a condensed benzene ring;
- L and L′ represent a linking group;
- and
- G and G′ represent an acid group or salt thereof;
- and
- wherein Rm, R1 and R2 independently represent H, alkyl or aryl.
A heat-sensitive negative-working lithographic printing plate precursor comprising:
- (a) a support having a hydrophilic surface or which is provided with a hydrophilic layer;
- and
- (b) an image-recording layer comprising hydrophobic thermoplastic polymer particles, an infrared light absorbing dye and an additional dye;
- according to Formulae VI or VII:
- wherein
- p and p′ are integers ranging from 0 to 3;
- X and X′ independently represent hydrogen, halogen, O—CH3, an optionally substituted alkyl or (hetero)aryl group, or a condensed benzene ring;
- and
- M+ is a monovalent positive counter ion.
Dependencies are inferred from the claim text.