Polymer having polymerizable group, polymerizable composition, planographic printing plate precursor, and planographic printing method using the same

Abstract

A polymer having a polymerizable group and an alkyleneoxy groups on side chains thereof, and a polymerizable composition containing the polymer. The polymerizable composition preferably contains a polymerizable compound and a polymerization initiator. Also provided is a planographic printing plate precursor having a polymerizable layer on a hydrophilic support, the polymerizable layer containing a polymer having a polymerizable on a side chain thereof. The planographic printing plate precursor can form an image without being subjected to an alkali development. An undercoat layer containing a specific copolymer may be provided between the support and the photopolymerizable layer.

1 - 19 . (canceled) 
   
   
       20 . A planographic printing plate precursor comprising a support and a laser-sensitive recording layer,
 wherein the planographic printing plate can be used for printing after exposure without being developed with an alkaline developer, the recording layer includes a polymer having a polymerizable group on a side chain thereof, and   wherein:   the planographic printing plate precursor is developable by
 i) attaching the planographic printing plate precursor to a printing machine; 
 ii) imagewise exposing the planographic printing plate precursor to laser light; and 
 iii) supplying printing ink and moistening water to the planographic printing plate precursor so as to remove the recording layer in unexposed regions and so as to generate a printing plate and conduct printing, 
   the polymer has a group represented by formula (1), (2), or (3) on a side chain thereof:   
     
       
         
         
             
             
         
       
       wherein in formulae (1) to (3), X represents an oxygen atom, a sulfur atom, or —N—R 12 ; Y represents an oxygen atom, a sulfur atom, or —N—R 12 ; Z represents an oxygen atom, a sulfur atom, —N—R 12 , or a phenylene group; and R 1  to R 12  each independently represent a monovalent substituent, 
       the polymer does not have an alkali-soluble group, and 
       the planographic printing plate precursor further comprises an undercoat layer provided between the support and the recording layer, and the undercoat layer includes a copolymer comprising a first repeating unit having an ethylenic unsaturated bond and a second repeating unit having a functional group capable of interacting with a surface of the support. 
     
   
   
       21 . The planographic printing plate precursor according to  claim 20 , wherein the copolymer in the undercoat layer comprises a repeating unit represented by the following formula (I) 
     
       
         
         
             
             
         
       
       wherein in formula (I), x and y represent copolymerization ratios, A 1  represents a repeating unit having an ethylenic unsaturated bond and A 2  represents a repeating unit represented by the following formula (A2) 
     
     
       
         
         
             
             
         
       
       wherein in formula (A2), R 1  to R 3  each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a halogen atom, L represents a divalent connecting group selected from the group consisting of —CO—, —O—, —NH—, a divalent aliphatic group, a divalent aromatic group, and a combination thereof and Q represents the following group: 
     
     
       
         
         
             
             
         
       
       wherein M 1  and M 2  each independently represent a hydrogen atom, a metal atom or an ammonium group, and 
       when the repeating unit represented by (A2) does not contain a hydrophilic portion, the copolymer may further include a repeating unit represented by the following formula (A3) 
     
     
       
         
         
             
             
         
       
       wherein in formula (A3), R 1  to R 3  each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, or a halogen atom, L represents a divalent connecting group selected from the group consisting of —CO—, —O—, —NH—, a divalent aliphatic group, a divalent aromatic group, and a combination thereof and W represents the following group: 
     
     
       
         
         
             
             
         
       
       wherein M 1  represents a hydrogen atom, a metal atom or an ammonium group. 
     
   
   
       22 . The planographic printing plate precursor according to  claim 20 , wherein the recording layer includes a copolymer comprising a first repeating unit having an ethylenic unsaturated bond and a second repeating unit having a functional group capable of interacting with a surface of the support.