Uv curable ink jet recording ink composition, ink container and ink jet recording apparatus

Abstract

The UV curable ink jet recording ink composition contains a thioxanthone-based photopolymerization initiator and a hindered amine compound. The dissolved oxygen content in the ink composition is 20 ppm or less.

1 - 20 . (canceled) 
     
     
         21 . A UV curable ink jet recording ink composition comprising:
 a polymerizable compound containing a monofunctional (meth)acrylate having a vinyl ether group; a thioxanthone-based photopolymerization initiator; and a hindered amine compound,   wherein the ink composition has an dissolved oxygen content of 20 ppm or less.   
     
     
         22 . The UV curable ink jet recording ink composition according to  claim 21 , wherein the thioxanthone-based photopolymerization initiator content is 0.5% to 4% by mass. 
     
     
         23 . The UV curable ink jet recording ink composition according to  claim 21 , wherein the hindered amine compound has a 2,2,6,6-tetramethylpiperidine-N-oxyl skeleton. 
     
     
         24 . The UV curable ink jet recording ink composition according to  claim 21 , wherein the thioxanthone-based photopolymerization initiator contains at least one compound selected from the group consisting of thioxanthone, diethylthioxanthone, isopropylthioxanthone, and chlorothioxanthone. 
     
     
         25 . The UV curable ink jet recording ink composition according to  claim 21 , wherein the thioxanthone-based photopolymerization initiator contains diethylthioxanthone. 
     
     
         26 . The UV curable recording ink composition according to  claim 21 , further containing an acylphosphine oxide-based photopolymerization initiator. 
     
     
         27 . An ink container comprising:
 the UV curable ink jet recording ink composition as set forth in  claim 21 ; and   a member in contact with the ink composition.   
     
     
         28 . An ink container comprising:
 the UV curable ink jet recording ink composition as set forth in  claim 22 ; and   a member in contact with the ink composition.   
     
     
         29 . An ink container comprising:
 the UV curable ink jet recording ink composition as set forth in  claim 23 ; and   a member in contact with the ink composition.   
     
     
         30 . An ink container comprising:
 the UV curable ink jet recording ink composition as set forth in  claim 24 ; and   a member in contact with the ink composition.   
     
     
         31 . An ink container comprising:
 the UV curable ink jet recording ink composition as set forth in  claim 25 ; and   a member in contact with the ink composition.   
     
     
         32 . An ink container comprising:
 the UV curable ink jet recording ink composition as set forth in  claim 26 ; and   a member in contact with the ink composition.   
     
     
         33 . An ink container comprising:
 the UV curable ink jet recording ink composition as set forth in  claim 27 ; and   a member in contact with the ink composition.   
     
     
         34 . The ink container according to  claim 27 , wherein
 the member is made of a material having an oxygen permeation rate of 5.0 cc·20 μm/(m 2 ·day·atm) or less at a temperature of 23° C. and a relative humidity of 65%.   
     
     
         35 . The UV curable recording ink composition according to  claim 21 , wherein the monofunctional (meth)acrylate having a vinyl ether group contains one or more of 2-vinyloxyethyl (meth)acrylate, 3-vinyloxypropyl (meth)acrylate, 1-methyl-2-vinyloxyethyl (meth)acrylate, 2-vinyloxypropyl (meth)acrylate, 4-vinyloxybutyl (meth)acrylate, 1-methyl-3-vinyloxypropyl (meth)acrylate, 1-vinyloxymethyl propyl (meth)acrylate, 2-methyl-3-vinyloxypropyl (meth)acrylate, 1,1-dimethyl-2-vinyloxyethyl (meth)acrylate, 3-vinyloxybutyl (meth)acrylate, 1-methyl-2-vinyloxypropyl (meth)acrylate, 2-vinyloxybutyl (meth)acrylate, 4-vinyloxycyclohexyl (meth)acrylate, 6-vinyloxyhexyl (meth)acrylate, 4-vinyloxymethylcyclohexylmethyl (meth)acrylate, 3-vinyloxymethylcyclohexylmethyl (meth)acrylate, 2-vinyloxymethylcyclohexylmethyl (meth)acrylate, p-vinyloxymethylphenylmethyl (meth)acrylate, m-vinyloxymethylphenylmethyl (meth)acrylate, o-vinyloxymethylphenylmethyl (meth)acrylate, 2-(vinyloxyethoxy)ethyl (meth)acrylate, 2-(vinyloxyisopropoxy)ethyl (meth)acrylate, 2-(vinyloxyethoxy)propyl (meth)acrylate, 2-(vinyloxyethoxy)isopropyl (meth)acrylate, 2-(vinyloxyisopropoxy)propyl (meth)acrylate, 2-(vinyloxyisopropoxy)isopropyl (meth)acrylate, 2-(vinyloxyethoxyethoxy)ethyl (meth)acrylate, 2-(vinyloxyethoxyisopropoxy)ethyl (meth)acrylate, 2-(vinyloxyisopropoxyethoxy)ethyl (meth)acrylate, 2-(vinyloxyisopropoxyisopropoxy)ethyl (meth)acrylate, 2-(vinyloxyethoxyethoxy)propyl (meth)acrylate, 2-(vinyloxyethoxyisopropoxy)propyl (meth)acrylate, 2-(vinyloxyisopropoxyethoxy)propyl (meth)acrylate, 2-(vinyloxyisopropoxyisopropoxy)propyl (meth)acrylate, 2-(vinyloxyethoxyethoxy)isopropyl (meth)acrylate, 2-(vinyloxyethoxyisopropoxy)isopropyl (meth)acrylate, 2-(vinyloxyisopropoxyethoxy)isopropyl (meth)acrylate, 2-(vinyloxyisopropoxyisopropoxy)isopropyl (meth)acrylate, 2-(vinyloxyethoxyethoxyethoxy)ethyl (meth)acrylate, 2-(vinyloxyethoxyethoxyethoxyethoxy)ethyl (meth)acrylate, 2-(isopropenoxyethoxy)ethyl (meth)acrylate, 2-(isopropenoxyethoxyethoxy)ethyl (meth)acrylate, 2-(isopropenoxyethoxyethoxyethoxy)ethyl (meth)acrylate, 2-(isopropenoxyethoxyethoxyethoxyethoxy)ethyl (meth)acrylate, polyethylene glycol monovinyl ether (meth)acrylate, polypropylene glycol monovinyl ether (meth)acrylate. 
     
     
         36 . The UV curable recording ink composition according to  claim 21 , wherein the content of the monofunctional (meth)acrylate having a vinyl ether group is 10% to 70% by mass relative to the total mass of the ink composition. 
     
     
         37 . The UV curable recording ink composition according to  claim 21 , wherein the polymerizable compound contains one or more of bifunctional or higher polyfunctional (meth)acrylate. 
     
     
         38 . The UV curable recording ink composition according to  claim 37 , wherein the content of the bifunctional or higher (meth)acrylate is 5% to 60% by mass relative to the total mass of the ink composition. 
     
     
         39 . The UV curable recording ink composition according to  claim 21 , wherein the content of the photopolymerization initiator is 5% to 20% by mass relative to the total mass of the ink composition. 
     
     
         40 . An ink jet recording method comprising ejecting the UV curable ink jet recording ink composition according to  claim 21  from a head in a state where the dissolved oxygen content is 20 ppm or less.