PROPYLENE SYSTEM MULTILAYER SHEET AND PACKAGING BAG FOR PRESSURE TREATMENT USING THE SAME

• Main Authors: KADOWAKI YUJI, KANAI GEN
• Format: Patent
• Language: English
• Published: 07.04.2011
• Subjects: ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS,e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES,DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; CONVEYING; HANDLING THIN OR FILAMENTARY MATERIAL; 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; PACKAGES; PACKAGING ELEMENTS; PACKING; PERFORMING OPERATIONS; STORING; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING

PROBLEM TO BE SOLVED: To provide a multilayer sheet which has excellent flexibility, transparency, impact resistance, heat resistance, heat-sealing properties and cleanliness, rarely undergoes deterioration in appearance, fluctuation in thickness or the like during multilayer molding, has good moldability and is rarely reduced in strength of a sheet base material even when thickness of the sheet is reduced and further to provide a packaging bag for pressure treatment. SOLUTION: The multilayer sheet comprises at least three layers, that are an outer layer, an intermediate layer and an inner layer in order. The intermediate layer is made of a resin composition (X) which comprises a propylene resin composition (A) consisting of specific propylene-ethylene random copolymer components (G1), (G2) obtained by successive polymerization by a metallocene catalyst, an ethylene-α-olefin copolymer (B) and a propylene resin (C). The outer layer is made of a specific propylene resin composition (Y) and the inner layer is made of a specific propylene resin composition (Z). Further the packaging bag for pressure treatment obtained by using the multilayer sheet is provided. COPYRIGHT: (C)2011,JPO&INPIT