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AssigneeToyo Ink Manufacturing Co., Ltd.
InventorsTadashi Itabashi, Takashi Kamikubo, Katsuhiko Sawamura
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The present invention provide an aqueous type pigment dispersing agent having one portion which has a high affinity with a pigment and which has at least one type of selected from the group consisting of an organic dye, anthraquinone and acridone and only at a terminal end or at both terminal ends of at least one aqueous polymer selected from an aqueous linear urethanic polymer and an aqueous linear acrylic polymer, a pigment composition using the same and a pigment dispersion. The portion having a high affinity with the pigment can be adsorbed efficiently on the surface of a pigment. At the same time, for example, a pigment, used for ink or paint can be dispersed stably due to the affinity between the polymer portion and a disperse medium to improve the adaptability in use and the quality of coating articles.
A pigment-dispersing agent for dispersing pigment in an aqueous medium, wherein said pigment-dispersing agent has a structure in which at least one member selected from the group consisting of an organic dye, anthraquinone and acridone is bound to a linear acrylic polymer having two terminal ends at one or both of said terminal ends by at least one reactive group on said member selected from the group consisting of --COCl, --SO.sub.2 Cl, --CH.sub.2 Cl, and --CH.sub.2 NHCOCH.sub.2 Cl, wherein the linear acrylic polymer has a primary amino group or a secondary amino group.
A pigment composition comprising a pigment and a pigment-dispersing agent for dispersing a pigment in an aqueous medium, wherein said pigment-dispersing agent has a structure in which at least one member selected from the group consisting of an organic dye, anthraquinone and acridone is bound to a linear acrylic polymer having two terminal ends at one or both of said terminal ends by at least one reactive group on said member selected from the group consisting of --COCl, --SO.sub.2 Cl, --CH.sub.2 Cl and --CH.sub.2 NHCOCH.sub.2 Cl, wherein the linear acrylic polymer has a primary amino group or a secondary amino group.
An aqueous pigment dispersion comprising a water dispersible or water soluble polymer, a pigment, and a pigment-dispersing agent for dispersing a pigment in an aqueous medium, wherein said pigment-dispersing agent has a structure in which at least one member selected from the group consisting of an organic dye, anthraquinone and acridone is bound to a linear acrylic polymer having two terminal ends at one or both of said terminal ends by at least one reactive group on said member selected from the group consisting of --COCl, --SO.sub.2 Cl, --CH.sub.2 Cl, and --CH.sub.2 NHCOCH.sub.2 Cl, wherein the linear acrylic polymer has a primary amino group or a secondary amino group.
A method for making a pigment-dispersing agent for dispersing a pigment in an aqueous medium, comprising the steps of:
Dependencies are inferred from the claim text.