Effect of Properties of High-Molecular Weight Polymer on the Characteristics of Polymer-Dispersed Pigment in Water-Based Ink

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  • 水性インク用高分子分散顔料の特性に及ぼすポリマー物性の影響
  • スイセイ インクヨウ コウブンシ ブンサン ガンリョウ ノ トクセイ ニ オヨボス ポリマー ブッセイ ノ エイキョウ

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In the field of inkjet inks, pigments have come to be used in place of dyestuffs in order to improve durability and the image quality of the printing. Most are organic pigments. For dispersing the pigment, it is necessary to satisfy various characteristics including stability. In this paper, the basic characteristics of polymer-dispersed pigments were examined.<br>The initial viscosity of the dispersion related well to the molecular weight and the acid value of the dispersant. The former influences the entanglement of the polymer chains and the latter relates to the thickness of hydration layer of the dispersion.<br>The image density showed a good relationship to the acid value which is also the index of hydrophilicity and but had no relationship to the pigment size and molecular weight of the polymer. Moreover it turned out that the spread area of the ink droplet on paper, considered to be the interaction of the polymer and the paper, provides an index by which the image density can be quantified.<br>The rubfastness was found to be related to the pigment size and molecular weight of the polymer.

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