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 . A radical-crosslinkable polymer having a polymerizable group and an alkyleneoxy group on a side chain or side chains thereof.  
     
     
         2 . The radical-crosslinkable polymer according to  claim 1 , wherein the polymerizable group is a styrene group.  
     
     
         3 . A polymerizable composition comprising the radical-crosslinkable polymer of  claim 1 .  
     
     
         4 . The polymerizable composition according to  claim 3 , further comprising a polymerizable compound and a polymerization initiator.  
     
     
         5 . The polymerizable composition according to  claim 3 , further comprising a sensitizing colorant.  
     
     
         6 . The polymerizable composition according to  claim 3 , wherein the radical-crosslinkable polymer comprises a copolymer component which has a structure represented by the following formula (S) on a side chain thereof:  
       
         
           
           
               
               
           
         
         wherein in formula (S), Z 1  represents a connecting group; R 1 , R 2 , and R 3  each independently represent a hydrogen atom, a halogen atom, a carboxyl group, a sulfo group, a nitro group, a cyano group, an amide group, an amino group, an alkyl group, an aryl group, an alkoxy group, or an aryloxy group, each of which may have a substituent; R 4  represents a group or atom which can combine with the benzene ring and may have a substituent; n represents 0 or 1; m1 represents an integer of 0 to 4; and k1 represents an integer of 1 to 4.  
       
     
     
         7 . The polymerizable composition according to  claim 6 , wherein a proportion of the copolymer component to the radical-crosslinkable polymer is 1 to 50% by mol.  
     
     
         8 . The polymerizable composition according to  claim 3 , wherein the radical-crosslinkable polymer comprises a copolymer component which has a structure represented by the following formula (AO) on a side chain thereof:  
       
         
           
           
               
               
           
         
         wherein in formula (AO), Z A  represents a connecting group; R A1  represents an alkylene group; R A2  represents a hydrogen atom, an alkyl group, or an aryl group; and n represents an integer of 1 to 20.  
       
     
     
         9 . The polymerizable composition according to  claim 8 , wherein a proportion of the copolymer component to the radical-crosslinkable polymer is 5 to 90% by mol.  
     
     
         10 . 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, and the recording layer includes a polymer having a polymerizable group on a side chain thereof.  
     
     
         11 . The planographic printing plate precursor according to  claim 10 , wherein the polymerizable group is a styrene group.  
     
     
         12 . The planographic printing plate precursor according to  claim 11 , wherein the polymer further has an alkyleneoxy group on a side chain thereof.  
     
     
         13 . The planographic printing plate precursor according to  claim 10 , wherein the polymerizable group has an ethylenic unsaturated bond.  
     
     
         14 . The planographic printing plate precursor according to  claim 13 , wherein 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.  
       
     
     
         15 . The planographic printing plate precursor according to  claim 10 , wherein the recording layer includes a microcapsule.  
     
     
         16 . The planographic printing plate precursor according to  claim 10 , 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.  
     
     
         17 . The planographic printing plate precursor according to  claim 10 , wherein the planographic printing plate precusor further comprises a layer other than the recording layer, and the layer other than 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.  
     
     
         18 . A planographic printing method comprising: 
 attaching the planographic printing plate precursor of  claim 10  to a printing machine;    imagewise exposing the planographic printing plate precursor to laser light; and    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 conduct printing.    
     
     
         19 . The planographic printing method according to  claim 18 , wherein the imagewise exposure to laser light is conducted before the attachment of the planographic printing plate precursor to the printing machine.