Ink and ink-applying process and apparatus using the same
Disclosed herein is an ink including a coloring material, a resin and a solvent, wherein the resin is a block copolymer of a polyvinyl ether structure having a hydrophilic segment and a hydrophobic segment, and the hydrophilic segment of the block copolymer has a number average molecular weight of 1,000 to 50,000 and an HLB value of 4 to 18.
1. An ink comprising a coloring material, a resin, and a solvent, wherein the resin is a block copolymer comprising a polyvinyl ether structure, the block copolymer having a hydrophilic segment and a hydrophobic segment and having an HLB value of 4 to 18, and the hydrophilic segment of the block copolymer has a number average molecular weight of 1,000 to 50,000, wherein the hydrophobic block segment of the block copolvmer has a number average molecular weight of 5,000 or higher, and wherein an anionic hydrophilic repeating unit structure is contained in the hydrophilic segment of the block copolymer.
2. The ink according to claim 1 , wherein the HLB value falls within a range of from 14 to 18.
3. The ink according to claim 1 , wherein the proportion of the block copolymer falls within a range of from 0.001 to 40% by weight based on the total weight of the ink.
4. The ink according to claim 1 , wherein the proportion of the coloring material falls within a range of from 0.1 to 20% by weight based on the total weight of the ink.
5. The ink according to claim 4 , wherein the coloring material is composed of a pigment.
6. The ink according to claim 5 , wherein the pigment has a size of 500 μm or smaller.
7. An ink-applying process comprising the step of applying the ink according to claim 1 to a recording medium.
8. An ink-applying apparatus comprising an ink-applying means for applying the ink according to claim 1 to a recording medium by applying energy to the ink, and a driving means for driving the ink-applying means.