Ink unit including ink and ink-wetted member

Abstract

An ink unit comprising an ink utilized for an inkjet recorder; and a wetted member that contacts with the ink, wherein the ink comprises a pigment dispersedly held in a medium, and the pigment contains particles having a size of 200 nm or larger in 2 volume percent or less, and wherein a principal component of the ink-wetted member is a polyolefin produced by addition of a phenolic anitoxidant.

1 . An ink unit comprising:
 an ink utilized for an inkjet recorder; and   a wetted member that contacts with the ink,   wherein the ink comprises a pigment dispersedly held in a medium, and the pigment contains particles of 200 nm or larger in 2 percent by volume or less, and   wherein a principal component of the ink-wetted member is a polyolefin produced by addition of a phenolic antioxidant.   
   
   
       2 . The ink unit according to  claim 1 ,
 wherein the pigment is one of CI Pigment Yellow-12, CI Pigment Yellow-17, CI Pigment Yellow-55, CI Pigment Yellow-74, CI Pigment Yellow-97, CI Pigment Yellow-120, CI Pigment Yellow-128, CI Pigment Yellow-151, CI Pigment Yellow-155 and CI Pigment Yellow-180.   
   
   
       3 . The ink unit according to  claim 1 ,
 wherein the pigment is one of CI Pigment Red-122, CI Pigment Violet-19, CI Pigment Red-57:1, CI Pigment Red-146 and CI Pigment Blue-15:3.   
   
   
       4 . The ink unit according to  claim 1 ,
 wherein the ink is an ink set comprising at least a black ink, a cyan ink, a magenta ink and a yellow ink, and   wherein all of the black ink, the cyan ink, the magenta ink and the yellow ink contain a pigment dispersedly held in a medium, and the pigment contains particles of 200 nm or larger in 2 percent by volume or less.   
   
   
       5 . The ink unit according to  claim 1 ,
 wherein the pigment contains particles of 200 nm or larger in 1 percent by volume or less.   
   
   
       6 . The ink unit according to  claim 1 ,
 wherein the pigment contains particles of 200 nm or larger in 0.5 percent by volume or less.   
   
   
       7 . The ink unit according to  claim 1 ,
 wherein the polyolefin is a polypropylene.   
   
   
       8 . The ink unit according to  claim 1 ,
 wherein the ink-wetted member is an ink-wetted member of at least one of an ink tank and an ink cartridge.   
   
   
       9 . The ink unit according to  claim 1 ,
 wherein the ink-wetted member is an ink-wetted member of an ink absorber.   
   
   
       10 . The ink unit according to  claim 1 ,
 wherein the ink-wetted member is an ink-wetted member of at least one of a tube of an ink supply system, a common flow passage of a head, a pressure chamber of a head and a nozzle of a head.