초록 ▼

A parison, as a precursor of a container, composed at least of a thermoplastic resin (resin A) and another thermoplastic resin having excellent gas-barrier property (resin B) and containing a multilayered resin layer at least in an intermediate layer between an outermost layer and an innermost layer

A parison, as a precursor of a container, composed at least of a thermoplastic resin (resin A) and another thermoplastic resin having excellent gas-barrier property (resin B) and containing a multilayered resin layer at least in an intermediate layer between an outermost layer and an innermost layer each composed of resin A at parts other than the open end part of the mouth portion of the parison, or wholly in the parison, said multilayered resin layer being formed by using an injection-molding machine equipped with a static mixing-stirring device provided in a nozzle portion of an injection cylinder, or in a mold, or in a resin flow passage between the nozzle portion and a mold, and injecting the resins A and B through the static mixing-stirring device so that flows of the resins A and B are divided in a plurality of thin layers parallel to the flowing direction; and a process for production thereof. A container obtained by biaxially stretching and blow-molding the said parison has excellent transparency, gas-barrier property and mechanical strength.

대표청구항 ▼

A parison, as a precursor of a container, formed by using an injection-molding machine, comprising an open end part of a mouth portion composed of a thermoplastic resin (resin A), and parts other than the open end part of the mouth portion comprising an inside surface layer and an outside surface la

A parison, as a precursor of a container, formed by using an injection-molding machine, comprising an open end part of a mouth portion composed of a thermoplastic resin (resin A), and parts other than the open end part of the mouth portion comprising an inside surface layer and an outside surface layer which are composed of the resin A, and an interlayer located between the inside surface layer and the outside surface layer, said interlayer being composed of the resin A and another thermoplastic resin having superior gas-barrier properties (resin B) with respect to resin A, said interlayer having a multi-layered structure comprising thin layers of the resin A and thin layers of the resin B laminated alternately in the radial direction of the parison wherein part of said thin layers of the resin A and part of said thin layers of the resin B are discontinuous in the circumferential direction and/or the axial direction of the parison, and being formed by injecting the resin A and the resin B through a static mixing-stirring device, which is provided in a nozzle portion of an injection cylinder, or in a mold, or in a resin flow passage between the nozzle portion of the injection cylinder and the mold, so that flows of the resin A and the resin B are divided in a plurality of thin layers of the resin A and thin layers of the resin B parallel to the flowing direction thereof.