Multilayer container, method for producing two-layer preform and method for producing multilayer container

A method for producing a two-layer preform, comprising

• performing a two-color molding of an inner layer preform and an outer layer preform by injecting a composition for forming an outer layer comprising a polyolefin resin, between the inner layer preform comprising a polyamide resin and a mold for forming an outer layer preform and positioned outside the inner layer preform,
• wherein the polyamide resin comprises a xylylenediamine-based polyamide resin comprising a diamine-derived structural unit and a dicarboxylic acid-derived structural unit, 70 mol % or more of the diamine-derived structural units being derived from xylylenediamine, and 70 mol % or more of the dicarboxylic acid-derived structural units being derived from an α,ω-linear aliphatic dicarboxylic acid having from 4 to 20 carbon atoms.

A method for producing a multilayer container,

• comprising performing a two-color molding of an inner layer preform and an outer layer preform to produce a two-layer preform by injecting a composition for forming an outer layer and comprising a polyolefin resin, between the inner layer preform and a mold for forming an outer layer preform, the inner layer preform comprising a polyamide resin, and the mold positioned outside the inner layer preform, and further performing a blow molding of the two-layer preform,
• wherein the polyamide resin comprises a xylylenediamine-based polyamide resin comprising a diamine-derived structural unit and a dicarboxylic acid-derived structural unit, 70 mol % or more of the diamine-derived structural units being derived from xylylenediamine, and 70 mol % or more of the dicarboxylic acid-derived structural units being derived from an α,ω-linear aliphatic dicarboxylic acid having from 4 to 20 carbon atoms.