MANUFACTURE OF MULTILAYERED ORIENTATION FILM

PURPOSE:To obtain multilayered orientation films excellent in appearance and in gas barrier property, by bi-axial orienting a raw material having the composition of at least five layers: polyester layer/adhesive resin layer/ethylene-vinyl alcohol copolymer (EVOH) layer/adhesive resin layer/polyester...

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Bibliographische Detailangaben
Hauptverfasser:	OOZEKI YUKIO, TANAKA NOBUO, KAWAI SHUJI, YASUZAWA HARUYOSHI, HIROFUJI SATOSHI
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain multilayered orientation films excellent in appearance and in gas barrier property, by bi-axial orienting a raw material having the composition of at least five layers: polyester layer/adhesive resin layer/ethylene-vinyl alcohol copolymer (EVOH) layer/adhesive resin layer/polyester layer and keeping density, layer thickness, and ingredient content specified. CONSTITUTION:A raw material which is composed of at least five layers: polyester layer/adhesive resin layer/EVOH layer/adhesive resin layer/polyester layer and whose EVOH density D (g/cm .20 deg.C), EVOH ethylene content E (mol%), and thickness ratio X of polyester layer to EVOH layer satisfy the Formula is bi-axially oriented. In this case, the layer construction is such that EVOH is not present in the surface. EVOH used is a copolymer obtained by saponification of the copolymer of ethylene and vinyl acetate, and its ethylene content is 20-60mol%, and the degree of saponification of vinyl acetate ingredient is 95% or more from view of gas barrier property, thermal stability, and co- orientation suitability.