TWI771274B

A polypropylene based sealant film for retort packaging includes a film made of a resin composition that contains 70 to 85 wt % of a propylene/ethylene block copolymer (a) and 15 to 30 wt % of a low-density polyethylene based polymer (b), wherein, as for the propylene/ethylene block copolymer (a), a...

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Bibliographische Detailangaben
Hauptverfasser:	FUKAGAI, YOSHITAKA, TOYOSHIMA, RYO, MATSUURA, YOUICHI
Format:	Patent
Sprache:	chi
Schlagworte:	ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G 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 GENERAL PROCESSES OF COMPOUNDING 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 WORKING-UP
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Beschreibung
Zusammenfassung:	A polypropylene based sealant film for retort packaging includes a film made of a resin composition that contains 70 to 85 wt % of a propylene/ethylene block copolymer (a) and 15 to 30 wt % of a low-density polyethylene based polymer (b), wherein, as for the propylene/ethylene block copolymer (a), a proportion of a 20° C. xylene insoluble portion is 75 to 85 wt % relative to 100 wt % of (a), a limiting viscosity ([η]H) of the insoluble portion is 1.7 to 2.0 dl/g, and a limiting viscosity ([η]EP) of a soluble portion is 3.0 to 3.4 dl/g, and the low-density polyethylene based polymer (b) has a density of 0.900 to 0.930 g/cm3 and a melt flow rate of 1 to 10 g/10 minutes.