MODIFIED FLEXIBLE EVOH FOR HIGH PERFORMANCE FILMS

• Main Authors: BAKER, SHARON, WALTHER, BRIAN W
• Format: Patent
• Language: English; French
• Published: 24.07.2014
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING-UP

The present invention relates to a film having a combination of good flexibility and excellent barrier properties. The film comprises at least one barrier layer. The barrier layer comprises at least 5 percent, by weight of the layer, of an anhydride and/or carboxylic acid functionalized ethylene/alpha-olefin interpolymer having a density in the range of from 0.855 to 0.900 g/cm3; and having a melt index (190°C/2.16 kg) of greater than 200 g/10 min. The barrier layer further comprises at least 60 percent, by weight of the layer, of an interpolymer derived from ethylene and vinyl alcohol monomer units. La présente invention concerne un film possédant une combinaison de bonne flexibilité et d'excellentes propriétés de barrière. Le film comprend au moins une couche barrière. La couche barrière comprend au moins 5 pour cent, en poids de la couche, d'un interpolymère d'éthylène/alpha-oléfine à fonctionnalité anhydride et/ou acide carboxylique possédant une masse volumique comprise dans la plage allant de 0,855 à 0,900 g/cm3; et possédant un indice de fusion (190 °C/2,16 kg) supérieur à 200 g/10 min. La couche barrière comprend en outre au moins 60 pour cent, en poids de la couche, d'un interpolymère dérivé de motifs monomères d'éthylène et d'alcool vinylique.