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1. 发明申请

US20140094559A1 INK JET INK COMPRISING ENCAPSULATED PIGMENT DISPERSIONS WITH MINIMAL FREE POLYMER 有权
标题翻译： INK喷墨打印机包含带有最小自由聚合物的包封色素分散体
公开(公告)号：US20140094559A1
公开(公告)日：2014-04-03
申请号：US14118558
申请日：2011-12-15
申请人： E.I DU PONT DE NEMOURS AND COMPANY
发明人： Hee Hyun Lee , Mihcael Joseph Otley , Michael Stephen Wolfe , Tristan Williams
IPC分类号： C09D11/00
CPC分类号： C09D11/326 , C09B67/0008 , C09B67/0013 , C09C1/24 , C09C1/3676 , C09C3/10 , C09D11/322
摘要： The present disclosure provides an inkjet ink comprising an aqueous vehicle and an encapsulated pigment dispersion. A process for encapsulating pigment dispersions is provided where a pigment is dispersed with a polymeric dispersant in an aqueous solvent system. The free polymer dispersant in the pigment dispersion is limited to less than 0.12 grams per gram of pigment. This dispersed pigment is then encapsulated by adding acrylate monomers and optionally acrylic and vinyl monomers and polymerizing. In the encapsulated pigment dispersion the weight ratio of final free polymer to polymer found to the final encapsulated pigment is less than 0.9. The free polymer dispersant is measured by a centrifugation method and the final free polymer is measured by a density gradient centrifugation method. Such encapsulated pigment dispersions may be used in inkjet inks and are stable to heat, aging test conditions, and solvent challenges. Prints from these inks have better durability.
摘要翻译：本公开提供了包含水性载体和包封的颜料分散体的喷墨油墨。提供了一种用于包封颜料分散体的方法，其中颜料与聚合物分散剂在水性溶剂体系中分散。颜料分散体中的游离聚合物分散剂限于每克颜料少于0.12克。然后通过加入丙烯酸酯单体和任选的丙烯酸和乙烯基单体并聚合来将该分散的颜料包封。在包封的颜料分散体中，最终的游离聚合物与最终胶囊化颜料发现的聚合物的重量比小于0.9。通过离心法测定游离聚合物分散剂，通过密度梯度离心法测定最终的游离聚合物。这种包封的颜料分散体可以用于喷墨油墨中，并且对于热，老化试验条件和溶剂挑战是稳定的。这些油墨的印刷具有更好的耐久性。

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