Production method for high-pressure processed multilayer structure, and high-pressure processing method for multilayer structure
AssigneeMitsubishi Chemical Corporation
InventorShinji Nakanishi
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Abstract
A production method for a high-pressure processed multilayer structure to be used for packages for foods and the like is provided. The production method includes: preparing a multilayer structure including an ethylene-vinyl alcohol copolymer (EVOH) layer formed from a resin composition containing an ethylene-vinyl alcohol copolymer having a saponification degree of greater than 99.7 mol % as a main component and an olefin resin layer having a thickness of less than 100 μm; and high-pressure processing the multilayer structure under a pressure of not lower than 200 MPa in an atmosphere at not lower than 20° C.
Claims4
A production method for a high-pressure processed multilayer structure having an ethylene-vinyl alcohol copolymer layer and olefin resin layers provided on front and back surfaces of the ethylene-vinyl alcohol copolymer layer, the method comprising:
- preparing a multilayer structure including an ethylene-vinyl alcohol copolymer layer formed from a resin composition containing an ethylene-vinyl alcohol copolymer having a saponification degree of greater than 99.7 mol % as a main component and at least one of the olefin resin layers has a thickness of less than 100 μm;
- and
- high-pressure processing the multilayer structure under a pressure of not lower than 200 MPa in an atmosphere at not lower than 20° C.,
- wherein:
- a thickness ratio between the thinnest one of the olefin resin layers and the thinnest ethylene-vinyl alcohol copolymer layer is 1/1 to 10/1, and
- the olefin resin layers consisting of an olefin resin alone, or the olefin resin and at least one selected from the group consisting of plasticizer, filler, clay, colorant, antioxidant, antistatic agent, lubricant, nucleating agent, antiblocking agent, UV absorber, and wax.
A high-pressure processing method for a multilayer structure having an ethylene-vinyl alcohol copolymer layer and olefin resin layers provided on front and back surfaces of the ethylene-vinyl alcohol copolymer layer,
- the ethylene-vinyl alcohol copolymer layer being formed from a resin composition containing an ethylene-vinyl alcohol copolymer having a saponification degree of greater than 99.7 mol % as a main component,
- at least one of the olefin resin layers has a thickness of less than 100 μm,
- the olefin resin layers consisting of an olefin resin alone, or the olefin resin and at least one selected from the group consisting of plasticizer, filler, clay, colorant, antioxidant, antistatic agent, lubricant, nucleating agent, antiblocking agent, UV absorber, and wax, and
- the method comprising high-pressure processing the multilayer structure under a pressure of not lower than 200 MPa in an atmosphere at 50 to 80° C.
Dependencies are inferred from the claim text.