Abstract: The water-soluble resin for printing of the present invention includes a monomer unit A having a sulfonate group; and a monomer unit B having no hydrophilic group, and a percentage of the monomer unit A based on a total of all monomer units is 5 to 35 mol %. According to the water-soluble resin for printing of the present invention, a printed matter from which a printing layer can be safely and efficiently removed with neutral water and which is excellent in water resistance can be realized.

Abstract: The present invention is a resin composition, including: a resin ?1 having an aromatic dicarboxylic acid monomer unit A1 having a hydrophilic group, a dicarboxylic acid monomer unit B1 having no hydrophilic group, and an aromatic monomer unit C1; and a resin ?2 having an aromatic dicarboxylic acid monomer unit A2 having a hydrophilic group, a dicarboxylic acid monomer unit B2 having no hydrophilic group, and an aliphatic monomer unit C2, wherein the resin ?2 includes a monomer unit other than a monomer unit that constitutes the resin ?1, and a mass ratio of a content of the resin ?1 to a content of the resin ?2 is 0.9 or more and 20 or less. According to the present invention, a resin composition that can be removed only with water while maintaining the heat resistance of polymer materials can be provided.