Ink composition and process for producing the same
AssigneeSeiko Epson Corporation
InventorsMakoto Taniguchi, Noriko Oyama
Life of this patent
Estimating the term…
Abstract
An ink composition which can provide a print having better water fastness, stably contains a colorant substantially insoluble or sparingly soluble in water, is less likely to cause clogging of a recording head, and can be advantageously used for ink jet recording is disclosed. The ink composition comprises: a colorant which is either sparingly soluble or insoluble in water; a water-soluble organic solvent capable of dissolving the colorant; a saccharide and/or polyvinyl pyrrolidone; and water.
Claims18
An ink composition comprising:
- a colorant which is either sparingly soluble or insoluble in water;
- a water-soluble organic solvent capable of dissolving the colorant;
- a saccharide and/or polyvinyl pyrrolidone;
- and water;
- said colorant being in a dispersed state in the ink composition and the ink composition being substantially free from any dispersant.
An ink composition for use in ink jet printing wherein ink droplets of the composition are ejected from a nozzle, the composition comprising:
- (a) a colorant which is either sparingly soluble or insoluble in water, said colorant being present in the composition in an amount of about 0.5 to 20% by weight;
- (b) a water-soluble organic solvent capable of dissolving the colorant, said water-soluble organic solvent being present in the composition in an amount of about 1 to 35% by weight;
- (c) water present as a major solvent;
- and
- (d) a saccharide or polyvinyl pyrrolidone present in the composition in an amount sufficient substantially to decrease a tendency of the ink composition to clog the nozzle during ink jet printing, said composition being substantially free from any dispersant.
Dependencies are inferred from the claim text.