Ink jet inks

Claim 1

An aqueous ink jet ink composition comprising: (a) a pigment dispersion; (b) an aqueous carrier medium; and (c) a cosolvent combination comprising: (i) at least 4.5% by weight based on the total weight of the ink composition of a polyol/alkylene oxide condensate having a solubility in water of at least 4.6% at 25° C. and represented by the formula: ##STR5## wherein X is independently --H or --CH 3 ; R=--H, --CH 3 , --C 2 H 5 , --C 3 H 9 , --C 4 H 9 , or --CH 2 O(CH 2 CH 2 O) e H; b=0 or 1; a+d+f(c+e)=2-100; f=1-6; and (ii) at least 2% by weight based on the total weight of the ink composition of a cyclic amide derivative having a solubility in water of at least 4.5% at 25° C. and represented by the formula: ##STR6## wherein n=3-7, R=H, or alkyl group having 1 to 4 carbon atoms, and optionally containing one or more hydroxy or ether groups, m=0-3, X=alkyl group having 1 to 4 carbon atoms, and optionally containing one or more hydroxy or ether groups, and wherein X replaces a H on the ring when m=1-3; wherein the ratio of cosolvent (i) to cosolvent (ii) is in the range from 10:1 to 1:10 by weight.