Polymeric Dispersants with Specific Affinity to Pigments for Ink Jet Applications
Abstract:A new class of highly effective polymeric dispersants for inkjet applications have been developed by covalent attachment of organic chromophore groups, capable of interacting with pigments, to hydrophilic polymers. The anchoring effect of such groups is defined by molecular similarity to the pigment structure and by less specific interactions. The affinity of the chromophore to the colorant surface is amplified by connecting multiple groups to one polymer molecule. Dispersants based on styrene-acrylic or styrene-maleic anhydride polymers with attached azo dyes proved to be very effective for yellow azo pigments, such as PY74, providing inkjet compositions with very high resistance to ink formulations with multiple co-solvents and reduced particle settling. On the other hand, a quinacridone chromophore, being linked to certain hydrophilic polymers, produces a very versatile dispersant, suitable for quinacridones, phthalocyanines and Carbon Black. Synthetic pathways to new dispersants as well as properties of obtained inkjet materials are discussed.
Document Type: Research Article
Publication date: January 1, 2009
For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.
Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.
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