TH75054A - Heat sealable film and its use - Google Patents

Abstract

DC60 (15/07/47) A thermally sealed film made from a polypropylene polymer composition, consisting of a propylene polymer (A) component, a propylene-alpha-O component. Lifin-random copolymer (B) and random copolymer components produced from ethylene and alpha-olifins with 4 or more carbon atoms. (C) where the mixing weight ratio of (A) / (B) is 80/20 to 95/5 and the content of (C) is 10 to 30% by weight of the component. Hot seal durability has a slight decrease in heat seal durability after heat treatment and has good anti-stick properties, hardness and durability. Good low temperature impact resistance With such features, this film is suitable for It is used as a wrapping material for items subject to a heat sterilization process, such as food retort, heat seal film made of polypropylene polymer composition, which is composed of polypropylene polymer ( A) propylene-alpha-olefin-rancocopolymer (B) and random-copolymer components produced from ethylene and a An alpha-olfin with 4 or more carbon atoms (C) where the mix weight ratio of (A) / (B) is 80/20 to 95/5 and the volume of (C) is 10. Up to 30% by weight of the above elements, the film has a heat seal durability with a slight reduction in heat seal durability after heat treatment and has good anti-stick properties, stiffness and stiffness. Good low temperature impact resistance With such features, this film is suitable for Used as a wrap material for items that need to undergo a heat sterilization process such as retort foods.

Claims (8)

1.Heat sealing film produced from a polypropylene polymer composition consisting of a propylene polymer (A) component, a propylene-alpha-oli component. Fin-random copolymer (B) and ethylene-based random copolymer components And alpha-olefins with 4 or more carbon atoms (C), where the elements It consists of the following components: (1) the weight ratio of the propylene polymer (A) component to the propylene-alpha-olefin-randomolymers. (B) is in the range 80/20 to 95/5 (2) Propylene-alpha-olifin-random copolymer (B) has an internal viscosity [Ita]. Is equal to 2 or more but not greater than 3.5 (dl / g) and contains 70 to 85% propylene units by weight and (3) ethylene-alpha-olifin component random copolymer. Mercury (C) has a density of 0.865 to 0.910 (g / cm2) and contains 10 to 30% of the above constituents by weight. 2. Heat sealable film according to claim 1, where the polypropylene component The polymers contain 15 to 30% p-xylin by weight when measured at 23 ํ and 2.6% of hexane solvent by weight or less when measured at 50. 3. Heat-sealing film according to claim 1 or 2, where the molten polymer composition has a melting rate. When measured at a temperature of 230 ํ 2 to 10 (g / 10 min) and the ethylene unit volume is 10 to 20% by weight. 4. Heat sealable film according to one of Claims 1 to 3 where the The ethylene-alpha-olifin random copolymer (C) has a melting flow rate. When measured at a temperature of 190 ํ 0.01 to 5 (g / 10 min). 5. Heat sealable films in accordance with claims 1 to 4, which are designed for Process wrapping applications Heat sterilization practice 6.Heat-sealed laminate film in which a substrate layer is pressed onto either side of the heat-sealed film described in one of Claim 1 to 4. 7. The laminated film is heat sealed according to claim 6, which is designed for applications in connection with the wrapping of items to be passed. Thermal sterilization process 8.Materials to be wrapped in a package that must be processed Practice sterilization with Hot, which wraps the item by Heat-sealed, laminated films, are sealed as mentioned in claim 6.