Ultraviolet ray curable ink jet composition and printed object

Abstract

An ultraviolet ray curable ink jet composition of the present invention is characterized by being adapted to be ejected using an ink jet method and containing: a polymerizable compound; metal particles subjected to a surface treatment; and a substance A having a partial structure represented by the following formula (1), where R 1 is a hydrogen atom, an oxygen radical, a hydrocarbon group or an alkoxy group, and each of R 2 , R 3 , R 4 and R 5 is independently a hydrogen atom or a hydrocarbon group.

What is claimed is: 
     
         1 . An ultraviolet ray curable ink jet composition adapted to be ejected using an ink jet method, comprising:
 a polymerizable compound;   metal particles subjected to a surface treatment; and   a substance A having a partial structure represented by the following formula (1),   
       
         
           
           
               
               
           
         
         where R 1  is a hydrogen atom, an oxygen radical, a hydrocarbon group or an alkoxy group, and each of R 2 , R 3 , R 4  and R 5  is independently a hydrogen atom or a hydrocarbon group. 
       
     
     
         2 . The ultraviolet ray curable ink jet composition as claimed in  claim 1 , wherein the surface treatment for the metal particles is carried out using a material selected from the group consisting of a phosphoric acid ester and a carboxylic acid. 
     
     
         3 . The ultraviolet ray curable ink jet composition as claimed in  claim 1 , wherein the surface treatment for the metal particles is carried out using a compound having an alkyl group including carbon atoms of 8 to 20. 
     
     
         4 . The ultraviolet ray curable ink jet composition as claimed in  claim 1 , wherein the surface treatment for the metal particles is carried out using a compound having no aromatic ring. 
     
     
         5 . The ultraviolet ray curable ink jet composition as claimed in  claim 1 , wherein at least a surface of each metal particle is formed from Al. 
     
     
         6 . The ultraviolet ray curable ink jet composition as claimed in  claim 1 , wherein each metal particle is of a scaly shape. 
     
     
         7 . The ultraviolet ray curable ink jet composition as claimed in  claim 1 , wherein an average particle size of the metal particles is in the range of 400 nm to 3.0 μm. 
     
     
         8 . The ultraviolet ray curable ink jet composition as claimed in  claim 1 , wherein in the case where an amount of the substance A contained in the ultraviolet ray curable ink jet composition is defined as X A  [mass %] and an amount of the metal particles contained therein is defined as X M  [mass %], X A  and X M  satisfy a relationship of 0.01≦X A /X M ≦0.8. 
     
     
         9 . The ultraviolet ray curable ink jet composition as claimed in  claim 1 , wherein the ultraviolet ray curable ink jet composition further comprises a polymerization inhibitor, and an amount of the polymerization inhibitor contained in the ultraviolet ray curable ink jet composition is 0.6 mass % or less. 
     
     
         10 . The ultraviolet ray curable ink jet composition as claimed in  claim 1 , wherein an amount of the polymerizable compound contained in the ultraviolet ray curable ink jet composition is 50 mass % or more. 
     
     
         11 . The ultraviolet ray curable ink jet composition as claimed in  claim 1 , wherein the polymerizable compound contains at least one selected from the group consisting of phenoxy ethyl acrylate, 2-(2-vinyloxy ethoxy)ethyl acrylate and tetrahydro furfuryl acrylate. 
     
     
         12 . The ultraviolet ray curable ink jet composition as claimed in  claim 11 , wherein the polymerizable compound contains at least one selected from the group consisting of dipropylene glycol diacrylate, tripropylene glycol diacrylate, polypropylene glycol diacrylate, hexanediol diacrylate, cyclohexyl acrylate, γ-butyrolactone acrylate, N-vinyl caprolactam and 4-hydroxy butyl acrylate in addition to the acrylate. 
     
     
         13 . The ultraviolet ray curable ink jet composition as claimed in  claim 1 , wherein the polymerizable compound contains dimethylol tricyclodecane diacrylate and/or amino acrylate. 
     
     
         14 . A printed object produced by applying the ultraviolet ray curable ink jet composition defined by  claim 1  onto an object, and then irradiating the ultraviolet ray curable ink jet composition with an ultraviolet ray.