PREPARATION OF PIGMENT DISPERSIONS AND TONER COMPOSITIONS

PROBLEM TO BE SOLVED: To provide a method for preparing a pigment dispersion at low cost using far less energy and using less capital-intensive equipment than conventional processes, by providing an improved process for preparing pigment dispersions of desired small particle sizes.SOLUTION: A method...

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Bibliographische Detailangaben
Hauptverfasser: CHRETIEN MICHELLE N, ALLEN C GEOFFREY, KEOSHKERIAN BARKEV, DARRELL W VAN BESIEN, CHOPRA NAVEEN, ELIYAHU JENNY
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide a method for preparing a pigment dispersion at low cost using far less energy and using less capital-intensive equipment than conventional processes, by providing an improved process for preparing pigment dispersions of desired small particle sizes.SOLUTION: A method for preparing a pigment dispersion having desired particle sizes includes milling a starting pigment dispersion, which contains a pigment and optionally a carrier and a dispersant, with milling media having an average particle size of about 100 μm or less, until a final pigment dispersion has at least one of a desired pigment average particle size and a desired pigment particle size distribution is obtained; optionally separating the milling media from the final pigment dispersion; and optionally diluting the final pigment dispersion to obtain a desired pigment particle concentration. 【課題】所望の小さな粒径を有する顔料分散物を調製するための改良プロセスを提供することにより、従来のプロセスよりもエネルギーをほとんど用いず、資本集約度が低い装置を用い、顔料分散物を低費用で調製する方法の提供。【解決手段】顔料と、場合により担体と、分散剤とを含む出発物質である顔料分散物を、最終的な顔料分散物が、所望の顔料平均粒径の少なくとも1つを有し、所望の顔料粒度分布が得られるまで、平均粒径が約100μm以下の粉砕媒体で粉砕することと;場合により、最終的な顔料分散物から粉砕媒体を分離することと;場合により、最終的な顔料分散物を希釈し、所望の顔料粒子濃度を得ること、とを含む所管の粒径を有する顔料分散物を調製するための方法。【選択図】なし