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SOLID PIGMENT COMPOSITION FOR PIGMENT INK, PIGMENT INK CONTAINING THE SAME, AND PROCESS FOR PREPARING THESE
SOLID PIGMENT COMPOSITION FOR PIGMENT INK, PIGMENT INK CONTAINING THE SAME, AND PROCESS FOR PREPARING THESE
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机译:颜料墨水的固体颜料成分,包含相同成分的颜料墨水以及制备这些颜料的方法
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摘要
The present invention provides a process for preparing a solid pigment composition for pigment ink comprising the steps of: (a) dissolving polyvinyl alcohol in water, and dispersing pigments in the resulting solution; (b) adding aldehyde derivatives to the resulting pigment dispersion and allowing the polyvinyl alcohol to react with the aldehyde derivatives to prepare polyvinyl acetal; and (c) drying the acetalated pigment dispersion. The pigment ink resulted from the process, employs water-soluble solvents (for example, alcohol solvent, glycol solvent or other non-toxic solvents), contains sufficient amount of pigments, has low concentration with good pigment dispersion and storage stability, and shows good writing or recording ability with improved color-development.
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