Patent ID: 6300391
Filing Date: 2001-10-09
Classification: C09D

Abstract:
An ink for ink-jet printing, said ink comprising a colorant comprising a self-dispersing pigment, at least one pH-sensitive polymer, and an effective amount of a glycol ether solvent to improve dry time, wherein said polymer comprises monomers having the following basic structure: ##STR3##wherein R.sub.1 are independently selected from H or a C.sub.1 -C.sub.18 substituted or unsubstituted, branched or unbranched, alkyl, aromatic, or cyclic chain, optionally containing halogen, ester, ether, amine or amide functionalities; R.sub.2 is a group selected from the group consisting of a moiety containing a carboxylic acid group, primary amine, secondary amine, tertiary amine, or mixtures thereof; and R.sub.3 is a C.sub.1 -C.sub.18 substituted or unsubstituted, branched or unbranched, alkyl, aromatic, or cyclic chain, optionally containing ester, ether, amine or amide functionalities; and further provided that at least one monomer is a basic amine group aid one monomer is an acid group, and one monomer is a N-substituted acrylamide wherein said substitution is a C.sub.1 -C.sub.18 substituted or unsubstituted, branched or unbranched, alkyl, aromatic, or cyclic chain, wherein said polymer provides bleed control with an adjacently-printed ink that is superior to said ink without said polymer, and wherein said polymer and said glycol ether solvent together reduce dry time of said ink compared to an ink without said polymer and said glycol ether solvent together.