Polypropylene-based wrap film

Details Polypropylene-based wrap film Polypropylene-based wrap film

B - Operations, Transporting

32

B

B32B 27/32 (2006.01)

Patent

CA 2496926

An object of the present invention is to provide a wrap film which, in spite of containing a polypropylene-based resin, is excellent in a clinging property, does not require so much force to pull it out from a dispenser box and undergoes a less change in these characteristics depending on a lapse of time or storage temperature. Provided is a polypropylene-based multilayer wrap film comprising (A) a surface layer containing a first composition comprising 50 to 80 wt.% of (S1) a crystalline polypropylene-based resin and 20 to 50 wt.% of (S2) at least one softener selected from amorphous or low- crystalline propylene-.alpha.-olefin copolymers and butene-1 polymers, and based on 100 parts by weight of the first composition, 5 to 15 parts by weight of (S3) a hydrogenated terpene resin and 10 to 20 parts by weight of (S4) an aliphatic hydrocarbon which is liquid at normal temperature, and (B) a core layer which is adjacent to the surface layer and contains 80 to 98 wt.% of (C1) a crystalline polypropylene-based resin and 2 to 20 wt.% of (C2) an aliphatic hydrocarbon which is liquid at normal temperature.

La présente invention a trait à un film d'emballage en polypropylène dont les propriétés sont peu altérées dans le temps, formé de couches superficielles (A) réalisées en un matériau comportant 100 parties en poids d'une composition constituée de 50 à 80 % en poids d'une résine de polypropylène cristalline et de 20 à 50 % en poids d'au moins un plastifiant choisi parmi des copolymères propyléniques/ alpha -oléfiniques amorphes et faiblement cristallins et des polymères butyléniques, 5 à 15 parties en poids d'une résine terpénique hydrogénée, et 10 à 20 parties en poids d'un hydrocarbure aliphatique liquide à des températures ordinaires et une couche d'âme (B) réalisée en un matériau comportant 80 à 90 % en poids d'une résine de propylène cristalline et 2 à 20 % en poids d'un hydrocarbure aliphatique liquide à des températures ordinaires.

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