Aqueous pigment dispersion, water-soluble resin, production process of the resin, and equipment suitable for use with the dispersion
申请人:DAINICHISEIKA COLOR
& CHEMICALS MFG. CO. LTD.
公开号:EP0803554A2
公开(公告)日:1997-10-29
An aqueous pigment dispersion is formed of a pigment, an aqueous medium and a dispersant resin. The dispersant resin contains a hydrophobic moiety and a hydrophilic moiety in its molecule. The hydrophobic moiety is a polyester linkage chain formed of ester linkages as primary linkages. The hydrophilic moiety is a water-soluble resin containing sulfonic groups or their salts. The water-soluble resin can be produced, for example, by reacting a polyol with maleic acid and/or fumaric acid to synthesize an unsaturated polyester resin and then adding acid sulfurous acid or its salt to the unsaturated polyester resin to form groups represented by the following formula (I):
wherein M1 represents a hydrogen atom, an alkali metal, an ammonium group or a lower aliphatic quaternary ammonium group. The aqueous pigment dispersion is useful as a water-based ink for writing or recording equipments such as writing instruments, printers, copying machines, fax machines and printing machines.
水性颜料分散体由颜料、水性介质和分散剂树脂组成。分散剂树脂的分子中含有一个疏水分子和一个亲水分子。疏水分子是由酯链作为主链形成的聚酯链。亲水分子是含有磺酸基团或其盐类的水溶性树脂。水溶性树脂可通过以下方法制得:例如,将多元醇与马来酸和/或富马酸反应,合成不饱和聚酯树脂,然后向不饱和聚酯树脂中加入亚硫酸或其盐,形成下式(I)所代表的基团:
其中 M1 代表氢原子、碱金属、铵基或低脂族季铵基。该水性颜料分散体可用作书写或记录设备(如书写工具、打印机、复印机、传真机和印刷机)的水性墨水。