| 摘要 |
A method is useful for providing an ink jetted image with improved print optical density. The method includes use of an aqueous particle-free inkjet ink composition that consists essentially of: aqueous particle-free inkjet ink composition has a pH of 7 to 9, and consists essentially of: (A) a water-soluble dye colorant at 2-10 weight %, (B) a water-soluble polymer at 1-4 weight %, and an aqueous medium consisting essentially of water. The water-soluble polymer has an acid number or at least 130 and a molecular weight of 5,000-20,000. It comprises: (a) 55-80 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 12-20 carbon atoms; and (b) 20-35 mol % of recurring units comprising (meth)acrylic acid. |
| 主权项 |
1. A method of providing an ink jetted image, comprising:
ink jetting an aqueous particle-free inkjet ink composition onto a receiver element from a main fluid supply containing the aqueous particle-free inkjet ink composition, wherein the aqueous particle-free inkjet ink composition consists essentially of:
(A) a water-soluble dye colorant present in an amount of at least 2 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 %, based on the total weight of the aqueous particle-free inkjet ink composition, and(C) an aqueous medium consisting essentially of water, and wherein the water-soluble polymer has an acid number of at least 130 and a molecular weight of at least 5,000 and up to and including 20,000, and comprises: (a) at least 50 mol % and up to and including 85 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 10 to 20 carbon atoms; and (b) at least 15 mol % and up to and including 40 mol % of recurring units comprising a carboxylic acid group, all recurring unit amounts being based on the total recurring units in the water-soluble polymer. |
