Water-based pigment dispersion, use thereof and process for the production thereof
申请人:Toyo Ink Mfg. Co., Ltd.
公开号:US06648954B2
公开(公告)日:2003-11-18
A water-based pigment dispersion comprising 100 parts by weight of a pigment, 3 to 30 parts by weight of a sulfonic acid group-containing pigment derivative and water, wherein the sulfonic acid group-containing pigment derivative has only one sulfonic acid group in a molecule of a pigment of which the type is the same as the type of the pigment to be dispersed, the sulfonic acid group forms at least one salt selected from the group consisting of ammonia salt, an organic amine salt and a salt in which at least 15% of the sulfonic acid group is liberated and the rest is a salt with monovalent metal, the content of metal ion having a valence of at least 2 in a solid matter of the above water-based pigment dispersion is 500 ppm or less, and the above pigment is dispersed in water according to electrostatic repulsion due to the sulfonic acid group-containing pigment derivative adsorbed on the particle surface of the pigment, an inkjet recording liquid containing the same and process for the production thereof.
一种水性颜料分散剂,包括100份重量的颜料,3至30份重量的含磺酸基的颜料衍生物和水,其中含磺酸基的颜料衍生物在颜料分子中仅有一个磺酸基,其类型与待分散的颜料类型相同,磺酸基形成至少一种选自氨盐、有机胺盐和至少15%的磺酸基被释放且其余为单价金属盐的盐的盐,上述水性颜料分散剂的固体物中价态为2或以上的金属离子含量为500 ppm或以下,上述颜料通过磺酸基含量的静电斥力在颗粒表面吸附的作用下在水中分散,以及含有该水性颜料分散剂的喷墨记录液和其生产方法。