To provide a recording medium excellent in ink absorption, film forming property, surface luster and transparency, to provide a coating liquid for the recording medium, to provide a polymer emulsion using this coating liquid and a production method thereof, and to provide a method for effectively producing the recording medium.

A polymer emulsion, used for a producing of a recording medium, is composed of at least a polymer compound (A) which is obtained by polymerizing a polyvinyl alcohol and/or a derivative of the polyvinyl alcohol in coexistence thereof, displaying a hydrophilicity in the range of temperature of a specific temperature (a heat-sensitive point) or below, and displaying a hydrophobicity in the range of the heat-sensitive point or above. The production method for the polymer emulsion, the coating liquid for the recording medium containing the emulsion, the recording medium, wherein a coated layer of one or above is formed on a supporter and at least one layer of coated layers is formed by this coating liquid, and the production method of this recording medium are provided.