04-04-2013 дата публикации
Номер: US20130085233A1
An object of the present invention is to provide a novel copolymer useful as a dispersing agent for a pigment or the like. The novel copolymer contains: a block chain (A) comprising at least one repeating unit selected from the group consisting of a repeating unit having a tertiary amino group and a repeating unit having a quaternary ammonium salt group; and a block chain (B) comprising a repeating unit having an acidic group and a repeating unit represented by the following formula (I) (wherein Rrepresents a hydrogen atom or a C1-C3 alkyl group; and Rrepresents an aliphatic hydrocarbon group or an alicyclic hydrocarbon group), wherein the repeating unit represented by formula (I) has a copolymerization ratio of 90 mass % or more in the block chain (B). The present invention relates to a novel copolymer useful as a dispersing agent. The present application claims the benefit of priority from Japanese Patent Application No. 2010-148859, filed on Jun. 30, 2010, the contents of which are incorporated herein by reference.Copolymer-type pigment dispersing agents have been developed in a variety of fields.Pigment dispersing agents that improve, for example, the dispersibility, fluidity, storage stability, post-drying redissolution properties and substrate adhesion of pigments for ink, particularly, carbon black, have been developed. Patent Document 1 discloses a pigment composition comprising a pigment, an organic dye derivative containing an acidic functional group, an alkali-soluble resin and an organic solvent, wherein the alkali-soluble resin having an amino group and/or a quaternary ammonium group thereof has a basic equivalent of 3000 to 20000 g/eq and an acid number of 30 to 200 mgKOH/g. Specifically, the document describes a random copolymer of n-butyl methacrylate, methyl methacrylate, methacrylic acid and dimethylaminoethyl methacrylate, or the like as the alkali-soluble resin.Since the random copolymer of n-butyl methacrylate, methyl methacrylate, methacrylic ...
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