Patent ID: 6730155
Filing Date: 2004-05-04
Classification: C09D

Abstract:
An aqueous ink-jet composition, comprising:a coloring agent comprising at least one pigment selected from the group consisting of a condensed azo pigment, a condensed polycyclic pigment, a phthalocyanine pigment, and a nickel complex azo pigment; a dispersant for dispersing said coloring agent, comprising at least one surfactant selected from the group consisting of an anionic surfactant of formula (II) or (III): R2O(CH2CH2O)qSO3M2â€ƒâ€ƒ(II) R3O(CH2CH2O)TPO(OM3)OM4â€ƒâ€ƒ(III) â€ƒwherein R2 and R3 are each an alkyl group having 4 to 24 carbon atoms, an alkylphenyl group or an alkylallyl group; M2 and M4 are each an alkali metal ion, a quaternary ammonium ion, a quaternary phosphonium ion or an alkanolamine ion; M3 is hydrogen or R(CH2CH2O)T in which R is an alkyl group having from 1 to 4 carbon atoms, an alkylphenyl group or an alkylallyl group; q is an integer of 4 to 50 and r is an integer of 4 to 20; a wetting agent; a penetrating agent comprising at least one compound selected from the group consisting of a diol having 6 or more carbon atoms and a polyoxyethylene polyoxypropylene glycol represented by formula (IX): HO(C2H4O)sâ€”(C3H6O)tâ€”(C2H4O)WHâ€ƒâ€ƒ(IX) wherein t is an integer that can satisfy a condition that polyoxypropylene units have a molecular weight of 2500 or less in total; and s and u are each an integer that can satisfy a condition that the total molecular weight of polyoxyethylene units is 5 to 30% of the entire molecular weight of the polyoxyethylene polyoxypropylene glycol; and water, said ink composition having a surface tension of 20 mN/m or more and less than 35 mN/m.