Abstract: The purpose of the present invention is to provide a dispersant which allows disperse dyes and pigments to be dispersed even in a small addition amount, and can exhibit wettability, a dispersion which can exhibit redispersibility, an ink composition including the foregoing, and a method for producing the foregoing. The present invention provides a dispersant containing 50 to 99 wt % of (A) a styrene-ethyleneoxy group-containing (meth)acrylic acid-based copolymer haying a weight average molecular weight of 1,000 to 50,000, the copolymer having a styrene content of 1 to 40 wt %, and (B) 1 to 50 wt % of an acetylene-based surfactant which is acetylene glycol or an ethoxylated substance of acetylene glycol having a specific chemical formula, a dispersion, an ink composition, and a method for producing the foregoing.

Abstract: The present invention provides: a dispersing agent characterized by containing (A) 1-50 mass % of an acetylene-based surfactant that has a molecular weight of 500 or less and is at least one kind of compound selected from acetylene glycols represented by a specific formula and ethoxylated acetylene glycols represented by a specific formula, and (B) 50-99 mass % of a partially or fully-neutralized styrene/maleic anhydride copolymer salt that has a weight average molecular weight of less than 10,000, and that is a salt in which to a styrene maleic anhydride copolymer represented by a specific formula and derivatives thereof have been partially or fully neutralized; a dispersion element and ink composition that use said dispersing agent; and a manufacturing method for the same.