Plating catalyst liquid, plating method, and method for producing laminate having metal film

Abstract

A plating catalyst liquid which places little burden on the environment, which does not roughen the surface of a plating target, which can be easily controlled for the amount of plating catalyst applied and which is at low risk of inflammation and is highly safe, and a plating method using the plating catalyst are provided. The plating catalyst liquid includes a palladium compound, water, and a water-soluble combustible liquid serving as a combustible liquid ingredient, has a flash point of 40° C. or more and contains the water-soluble combustible liquid in an amount of 0.1 to 40 wt %.

1 . A plating catalyst liquid comprising: a palladium compound; water; and a water-soluble combustible liquid serving as a combustible liquid ingredient, wherein the catalyst liquid has a flash point of 40° C. or more and contains the water-soluble combustible liquid in an amount of 0.1 to 40 wt %. 
     
     
         2 . The plating catalyst liquid according to  claim 1 , wherein the water-soluble combustible liquid is a water-soluble organic solvent having no primary or secondary hydroxyl group. 
     
     
         3 . The plating catalyst liquid according to  claim 1  which further comprises an acid. 
     
     
         4 . The plating catalyst liquid according to  claim 1 , wherein a plating target is made of a hydrophobic resin having a functional group capable of interacting with a plating catalyst or its precursor. 
     
     
         5 . The plating catalyst liquid according to  claim 4 , wherein the hydrophobic resin is a cured product of a photosensitive resin composition containing a polymer which has the functional group capable of interacting with the plating catalyst or its precursor and a polymerizable group. 
     
     
         6 . The plating catalyst liquid according to  claim 5 , wherein the polymer is a copolymer containing recurring units represented by general formulas (1) and (2): 
       
         
           
           
               
               
           
         
       
       (in general formula (1), R 1  to R 4  are each independently a hydrogen atom or an optionally substituted alkyl group, Z and Y are each independently a single bond or an optionally substituted divalent organic group, and L 1  is an optionally substituted divalent organic group, and 
       in general formula (2), R 5  is a hydrogen atom or an optionally substituted alkyl group, X is a single bond or an optionally substituted divalent organic group, and L 2  is an optionally substituted divalent organic group). 
     
     
         7 . A plating method comprising:
 a catalyst applying step for applying a plating catalyst or its precursor to a plating target by contacting the plating catalyst liquid according to  claim 1  with the plating target; and   a plating step for plating the plating target obtained in the catalyst applying step.   
     
     
         8 . The plating method according to  claim 7 , wherein the plating target is made of a hydrophobic resin having a functional group capable of interacting with the plating catalyst or its precursor. 
     
     
         9 . The plating method according to  claim 8 , wherein the hydrophobic resin is a cured product of a photosensitive resin composition containing a polymer which has the functional group capable of interacting with the plating catalyst or its precursor and a polymerizable group. 
     
     
         10 . The plating method according to  claim 9 , wherein the polymer is a copolymer containing recurring units represented by general formulas (1) and (2): 
       
         
           
           
               
               
           
         
       
       (in general formula (1), R 1  to R 4  are each independently a hydrogen atom or an optionally substituted alkyl group, Z and Y are each independently a single bond or an optionally substituted divalent organic group, and L 1  is an optionally substituted divalent organic group, and 
       in general formula (2), R 5  is a hydrogen atom or an optionally substituted alkyl group, X is a single bond or an optionally substituted divalent organic group, and L 2  is an optionally substituted divalent organic group). 
     
     
         11 . A method for producing a laminate having a metal film, the method comprising:
 an application step in which a photosensitive resin composition containing a polymer having a functional group capable of interacting with a plating catalyst or its precursor and a polymerizable group is applied onto a substrate to form a photosensitive resin composition layer on the substrate;   an exposure step in which the photosensitive resin composition layer is exposed in a pattern shape to form a patterned cured layer;   a development step in which part of the photosensitive resin composition layer unexposed in the exposure step is removed;   a catalyst applying step in which the patterned cured layer obtained in the development step is contacted with the plating catalyst liquid according to  claim 1  to apply the plating catalyst or its precursor to the cured layer; and   a plating step in which a plating treatment is performed on the cured layer to which the plating catalyst or its precursor was applied in the catalyst applying step.   
     
     
         12 . The method for producing a laminate having a metal film according to  claim 11 , wherein the plating treatment in the plating step is one in which electroless plating is followed by electroplating. 
     
     
         13 . The plating catalyst liquid according to  claim 2  which further comprises an acid. 
     
     
         14 . The plating catalyst liquid according to  claim 2 , wherein a plating target is made of a hydrophobic resin having a functional group capable of interacting with a plating catalyst or its precursor. 
     
     
         15 . The plating catalyst liquid according to  claim 3 , wherein a plating target is made of a hydrophobic resin having a functional group capable of interacting with a plating catalyst or its precursor.