| 摘要 |
PROBLEM TO BE SOLVED: To obtain a pigment dispersion having high pigment loading and improved viscosity stability of pigment dispersion at a fixed viscosity and preferably compatibility with ink letdown vehicles and formulation components. SOLUTION: This pigment dispersant includes 80-97% by weight, based on the weight of the pigment dispersant, of a first polymer including as copolymerized units 15-75% by weight, based on the first polymer weight, ethylenically unsaturated carboxylic acid-functional monomer, the polymer having 4,000-16,000 Mw, and the polymer having a glass transition temperature greater than 70 deg.C and 3-20% by weight, based on the weight of the pigment dispersant, of a poly(ethylene oxide/propylene oxide) block second polymer having 3,000-20,000 Mw and a HLB of 16 to 32.
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