Patent ID: 9663669
Date: 2017-05-30
CPC Classifications: C09D

Claim:
1. An aqueous particle-free inkjet ink composition that has a pH of at least 7 and up to and including 9, and consists essentially of: (A) a water-soluble dye colorant present in an amount of at least 2 weight % and up to and including 10 weight %, based on the total weight of the aqueous particle-free inkjet ink composition, (B) a water-soluble polymer present in an amount of at least 1 weight % and up to and including 4 weight %, based on the total weight of the aqueous particle-free inkjet ink composition, and (C) an aqueous medium consisting essentially of water, wherein the water-soluble polymer has an acid number of at least 130 and a weight average molecular weight of at least 5,000 and up to and including 20,000, and comprises: (a) at least 55 mol % and up to and including 80 mol % of recurring units derived from one or more ethylenically unsaturated polymerizable monomers selected from the group consisting of substituted or unsubstituted styrenes, (meth)acrylates, and combinations thereof, each (meth)acrylate comprising either a pendant phenyl group or an alkyl ester group having 12 to 20 carbon atoms; and (b) at least 20 mol % and up to and including 35 mol % of recurring units comprising (meth)acrylic acid, all recurring unit amounts being based on the total recurring units in the water-soluble polymer.