Multilayer parison, process for its production and multilayer container.

摘要

A 9-layer parison whose wall portion is composed of two outside layers and one central layer of at least one thermoplastic resin (resin A) selected from the group consisting of thermoplastic polyester resins, polyolefin resins, polycarbonate, polyvinyl chloride, polystyrene and modified polystyrene, two interlayers of a thermoplastic gas-barrier (resin C) each being positioned between the central layer and each outside layer, and four adhesive layers of a thermoplastic adhesive resin (resin B) each being positioned between each outside layer and each interlayer or between each interlayer and the central layer. The said 9-layer parison can be produced by using a molding machine having three injection cylinders corresponding to resin A, B and C respectively, and continuously and successively injecting the molten resins A, B and C into a single mold in the order of resins A, B, C, B and A by one mold opening action. The parison is used to produce the wall portion of multilayer container such as a bottle.