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Abstract

A method for producing a multilayer article is provided. The method comprises: a step of applying a first dispersion liquid comprising a first liquid medium and a first polymer component, a first alkali metal ion and a first inorganic laminar compound each dispersed in the first liquid medium to a surface of a support having a layer composed of a first thermoplastic resin to form a first dispersion liquid film on the support, wherein the first polymer component contains hydroxyl groups and carboxyl groups at a molar ratio, hydroxyl groups:carboxyl groups, of from 30:70 to 95:5; a step of removing the first liquid medium from the first dispersion liquid film to form a first coating film, thereby producing a layered article comprising the support and the first coating film; a step of heating the layered article at or above a temperature at which a condensation reaction between a hydroxyl group and a carboxyl group in the first coating film can occur, thereby hardening the coating film; and a step of supplying a second thermoplastic resin having been plasticized onto the layer of the first thermoplastic layer of the substrate of the layered article and shaping it into a specified shape, thereby producing a multilayer article having the layered article and a layer of the second thermoplastic resin.

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