Ultraviolet-curable composition and recorded matter

Abstract

An ultraviolet-curable composition is discharged with an ink jet method and includes a polymerizable compound; a metal powder; and a thixotropy suppressing agent, in which a relationship of η2−η1≤3 is satisfied between a viscosity η1 [mPa·s] at a shearing speed of 1000 sec −1 and a viscosity η2 [mPa·s] which is determined by measuring in a state where the shearing speed is 10 sec −1 after continuing to add shearing stress for 10 minutes at the shearing speed of 1000 sec −1 .

1 . An ink composition comprising:
 a polymerizable compound;   a metal powder subjected to a surface treatment using a fluorine-based surface treatment agent, a content of the metal powder in the ink composition being 0.9 mass % to 29 mass %; and; and   a thixotropy suppressing agent containing a phosphoric acid-based dispersing agent.   
     
     
         2 . The ink composition according to  claim 1 ,
 wherein the thixotropy suppressing agent further includes at least one of an alkyl amine-based dispersing agent and a fluorine-containing powder.   
     
     
         3 . The ink composition according to  claim 1 ,
 wherein the content of the thixotropy suppressing agent in the ink composition is 0.2 mass % to 2.0 mass %.   
     
     
         4 . The ink composition according to  claim 1 , wherein the fluorine-based surface treatment agent is at least one selected from the group comprising a fluorine-based silane compound, a fluorine-based phosphate compound, a fluorine-substituted fatty acid, and a fluorine-based isocyanate compound. 
     
     
         5 . The ink composition according to  claim 1 ,
 wherein the average particle diameter of the metal powder is 200 nm to 3.0 μm.   
     
     
         6 . The ink composition according to  claim 1 ,
 wherein the metal powder includes constituent particles where at least a surface thereof includes Al.   
     
     
         7 . The ink composition according to  claim 1 ,
 wherein the constituent particles of the metal powder are flaky.   
     
     
         8 . The ink composition according to  claim 7 ,
 wherein an average thickness of the constituent particles of the metal powder is 10 nm to 80 nm.   
     
     
         9 . The ink composition according to  claim 1 ,
 wherein a monomer having an alicyclic structure is included as the polymerizable compound.   
     
     
         10 . The ink composition according to  claim 9 ,
 wherein the monomer having the alicyclic structure includes at least one selected from a group comprising tris(2-acryloyloxyethyl) isocyanurate, dicyclopentenyloxyethyl acrylate, adamantyl acrylate, γ-butyrolactone acrylate, N-vinylcaprolactam, N-vinylpyrrolidone, pentamethylpiperidyl acrylate, tetramethyl piperidyl acrylate, 2-methyl-2-adamantyl acrylate, 2-ethyl-2-adamantyl acrylate, mevalonic lactone acrylate, dimethylol tricyclodecane diacrylate, dimethylol dicyclopentane diacrylate, dicyclopentenyl acrylate, dicyclopentanyl acrylate, isobornyl acrylate, cyclohexyl acrylate, acryloylmorpholine, tetrahydrofurfuryl acrylate, cyclohexane spiro-2-(1,3-dioxolan-4-yl) methyl acrylate, and (2-methyl-2-ethyl-1,3-dioxolan-4-yl) methyl acrylate.   
     
     
         11 . The ink composition according to  claim 1 ,
 wherein the polymerizable compound is at least one monomer selected from a group comprising phenoxyethyl acrylate, benzyl acrylate, 2-(2-vinyloxyethoxy) ethyl acrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, 2-hydroxy 3-phenoxypropyl acrylate, and 4-hydroxybutyl acrylate.   
     
     
         12 . Recorded matter comprising:
 a cured product of the ink composition according to  claim 1 ; and   a recording medium.   
     
     
         13 . The ink composition according to  claim 1 , further comprising a substance A which has a partial structure which is shown by Formula (8): 
       
         
           
           
               
               
           
         
         where R1 indicates an oxygen atom, a hydrogen atom, a hydrocarbon group, or an alkoxyl group and R2, R3, R4, and R5 each independently indicate a hydrogen atom or a hydrocarbon group.