Patent ID: 6478862
Filing Date: 2002-11-12
Classification: C09D

Abstract:
An ink jet ink comprising:a) water; b) pigment; c) water miscible organic solvent; d) high-boiling water miscible organic solvent; e) optionally, a biocide; and f) optionally a photoinitiator; wherein said ink does not contain ethylene glycol or diethylene glycol; wherein the concentration of the water miscible organic solvent and the high boiling water miscible organic solvent together is from about 20% to about 50% by weight, based upon the total weight of the ink; wherein the surface tension of the ink is from 30 to 74 dyne-cm; wherein the liquid conductivity of the ink is less than about 5 milli-mhos; wherein the pigment has a nominal particle size of less than about 0.2 microns; and wherein the ink has a pH of from about 7 to about 10.