Patent ID: 6607589
Filing Date: 2003-08-19
Classification: C09D

Abstract:
A cyan ink having high plain paper chroma and good lightfastness in vehicles having pH at most 7, said cyan ink comprising:(a) a Copper Phthalocyanine (CuPc) dye compound having formula II: â€ƒwherein &Sgr;(x,y,z)=4; x is from 2.2 to 3, y is from 0.3 to 1, and z is from 0.5 to 1; the dye comprises from 0.01 to 30 parts by weight of the cyan ink; and the cyan ink has a pH of from about 3 to about 7; and (b) a medium comprising water or mixtures of water and an organic solvent.