Ink, ink jet recording method, ink cartridge, and ink jet recording apparatus

Abstract

An ink contains at least a pigment, wherein the pigment is a solid solution of C.I. Pigment Red 202 and C.I. Pigment Violet 19, and a primary particle diameter D (nm) of the pigment and a 50%-cumulative diameter D 50 (nm) in particle diameter distribution of the pigment satisfy a relation of D×0.95≦(=<)D 50 ≦(=<)130, and a 90%-cumulative diameter D 90 (nm) in particle diameter distribution of the pigment and the 50%-cumulative diameter D 50 (nm) satisfy a relation of 1.5≦(=<)D 90 /D 50 ≦(=<)2.2.

What is claimed is: 
     
       1. An ink comprising a pigment, wherein
 the pigment comprises a solid solution of C.I. Pigment Red 202 and C.I. Pigment Violet 19, and 
 a primary particle diameter D (nm) of the pigment and a 50%-cumulative diameter D 50  (nm) in particle diameter distribution of the pigment satisfy a relation of D×0.95≦(=<)D 50 ≦(=<)130, and a 90%-cumulative diameter D 90  (nm) in particle diameter distribution of the pigment and the 50%-cumulative diameter D 50  (nm) satisfy a relation of 1.5≦(=<)D 90 /D 50 ≦(=<)2.2, wherein the diameter D (nm) is 50 nm or more to 130 120  nm or less. 
 
     
     
       2. The ink according to  claim 1 , wherein the ink further comprises a polymer, the polymer having an acid value of 50 mgKOH/g or more to 300 mgKOH/g or less. 
     
     
       3. The ink according to  claim 2 , wherein the polymer has a nonionic unit. 
     
     
       4. The ink according to  claim 2 , wherein a content (mass %) of the pigment with respect to the total mass of the ink is 0.30 times or more to 10.0 times or less a content (mass %) of the polymer with respect to the total mass of the ink. 
     
     
       5. The ink according to  claim 1 , wherein the ink further comprises a 1,2-alkanediol and a polyoxyethylene alkyl ether. 
     
     
       6. An ink jet recording method comprising ejecting an ink by an ink jet system to perform recording on a recording medium, wherein the ink according to  claim 1  is used as the ink. 
     
     
       7. An ink cartridge having an ink storage portion storing an ink, wherein the ink is the ink according to in  claim 1 . 
     
     
       8. An ink jet recording apparatus having an ink storage portion storing an ink and a recording head for ejecting the ink, wherein the ink according to  claim 1  is used as the ink.