JP2005316471A5

JP2005316471A5 -

Info

Publication number: JP2005316471A5
Application number: JP2005126863A
Authority: JP
Filing date: 2005-04-25
Publication date: 2008-06-05
Anticipated expiration: 2025-04-25

Claims

On a support having a hydrophilic surface or provided with a hydrophilic layer,
(I) an infrared absorber,
(Ii) a first layer comprising hydrophobic thermoplastic polymer particles dispersed in a first hydrophobic binder, and (iii) a second hydrophobic binder, A negative working lithographic printing plate precursor comprising a coating comprising a second layer between one layer and the hydrophilic support, wherein the first hydrophobic binder is phenolic A precursor characterized in that it is a resin and the second hydrophobic binder is a polymer comprising at least one sulfonamide group.

The second hydrophobic binder is of formula IIa or IIb:

[Where:
R ⁷ , R ⁸ , R ⁹ and R ¹⁰ each independently represent hydrogen, halogen, hydroxyl, alkoxy and an optionally substituted alkyl or aryl group;
R ¹¹ is hydrogen, optionally substituted alkyl, alkanoyl, alkenyl, alkynyl, cycloalkyl, heterocycle, aryl, heteroaryl, aralkyl or heteroaralkyl group, formula —C (═N) —NH—R ¹² Or an allocyclic or heterocyclic group having 1 to 20 carbon atoms, wherein a thiazolyl group is excluded,
R ¹² represents hydrogen or an optionally substituted alkyl or aryl group]
The negative-acting lithographic printing plate precursor according to claim 1, comprising a monomer unit represented by:

The second hydrophobic binder is of formula III:

[Where:
Ar represents an optionally substituted aromatic hydrocarbon ring;
n = 0 or 1;
R ¹³ and R ¹⁴ each independently represent hydrogen or a hydrocarbon group having up to 12 carbon atoms;
k is an integer between 0 and 3,
X represents a single bond or a divalent linking group,
Y is a divalent sulfonamide group represented by —NR ^j —SO ₂ — or —SO ₂ —NR ^k —, wherein R ^j and R ^k are each independently hydrogen, optionally substituted. May represent an alkyl, alkanoyl, alkenyl, alkynyl, cycloalkyl, heterocycle, aryl, heteroaryl, aralkyl or heteroaralkyl group, or a group of formula —C (═N) —NH—R ¹⁵ , wherein R ¹⁵ is Represents hydrogen or an optionally substituted alkyl or aryl group,
Z represents a terminal group or a 2-, 3- or 4-valent linking group, wherein the remaining 1-3 bonds of Z are linked to Y]
The negative-acting lithographic printing plate precursor according to claim 1, comprising a monomer unit represented by:

The second hydrophobic binder is represented by formula IV:

[Where:
R ¹⁶ represents hydrogen or a hydrocarbon group having up to 12 carbon atoms,
X ¹ represents a single bond or a divalent linking group,
Y ¹ is a divalent sulfonamide group represented by —NR ^j —SO ₂ — or —SO ₂ —NR ^k —, wherein R ^j and R ^k are each independently hydrogen, optionally substituted. Represents an alkyl, alkanoyl, alkenyl, alkynyl, cycloalkyl, heterocycle, aryl, heteroaryl, aralkyl or heteroaralkyl group, or a group of formula —C (═N) —NH—R ¹⁵ where R ¹⁵ Represents hydrogen or an optionally substituted alkyl or aryl group;
Z ¹ is terminal group or 2-, 3- or 4-valent linking group, wherein the remaining 1 to 3 bonds of ^{Z 1} are linked to ^{Y 1]}
A negative working lithographic printing plate precursor according to claim 1 comprising a polymer comprising monomer units represented by

(I) preparing a negative working printing plate precursor according to any one of claims 1 to 8,
(Ii) exposing the coating imagewise to heat and / or infrared, thereby reducing the ability of the coating to penetrate and / or solubilize with an aqueous alkaline solution;
(Iii) A process for producing a negative working lithographic printing plate comprising the step of developing the imagewise exposed precursor with the aqueous alkaline solution, thereby dissolving the unexposed areas.