Aqueous ink jet ink composition

摘要

An aqueous ink jet ink is made by forming a mixture of a pigment, an optional dispersant if the pigment is not self-dispersing, dispersing, and a urethane polymer or prepolymer dispersion in water. This ink is useful in a variety of ink jet printing applications such as printing on wide format substrates and textiles.

主权项

1. An aqueous ink jet ink composition comprising a dispersed pigment, a polyurethane resin dispersion, and if the dispersed pigment is other than a self-dispersible pigment a dispersant to aid in the dispersion of the pigment;
wherein said polyurethane resin dispersion is derived from reacting a polyisocyanate comprising a diisocyanate of formula
O═C═N—R—N═C═Owith an active-hydrogen containing compound to form a urethane polymer or prepolymer, which is subsequently dispersed into an aqueous media forming a polyurethane resin dispersion;
wherein at least 60% by weight of the polyisocyanate component incorporated into said polyurethane resin dispersion is characterized as an cycloaliphatic isocyanate because the R group includes only aliphatic moieties of 4 to 30 carbon atoms; and wherein at least 75 mole percent of said active-hydrogen containing compound comprises a polyester from 1,6-hexane diol, neopentyl glycol and adipic acid.