Chub packaging film

Abstract

The present invention relates to a plastic film, which is particularly suitable for chub packaging. The film according to the present invention contains: a. at least one sealing layer, having at least one member of the group consisting of low density polyethylene, linear low density polyethylene, ethylene ester copolymers, ethylene alpha olefin copolymers, polypropylene copolymers or homopolymers, very low density polyethylene, polybutylene, styrene based copolymers, ionomers, and ethylene methacrylic acid copolymers; b. at least one barrier layer, comprising polyvinylidene chloride polymers; c. at least one intermediate layer, wherein each intermediate layer comprising ethylene ester copolymers, ethylene ester polymers, chemically modified polyethylenes, and/or chemically modified polypropylenes.

1 . A plastic film, comprising:
 a. at least one sealing layer, comprising at least one member of the group consisting of low density polyethylene, linear low density polyethylene, ethylene ester copolymers, ethylene alpha olefin copolymers, polypropylene copolymers or homopolymers, very low density polyethylene, polybutylene, styrene based copolymers, ionomers, ethylene methacrylic acid copolymers, and combinations thereof;   b. at least one barrier layer, comprising polyvinylidene chloride polymers;   c. at least one intermediate layer, comprising ethylene ester copolymers, ethylene ester polymers, chemically modified polyethylenes, and/or chemically modified polypropylenes.   
   
   
       2 . A plastic film according to  claim 1 , characterized in that said film comprises two outer sealing layers. 
   
   
       3 . A plastic film according to  claim 1 , characterized in that said film comprises one barrier layer. 
   
   
       4 . A plastic film according to  claim 1 , characterized in that said film comprises two or more intermediate layers. 
   
   
       5 . A plastic film according to  claim 1 , characterized in that said film comprises 2-10 intermediate layers. 
   
   
       6 . A plastic film according to  claim 1 , characterized in that said film comprises 4-8 intermediate layers. 
   
   
       7 . A plastic film according to  claim 1 , characterized in that said film comprises 6 intermediate layers. 
   
   
       8 . A plastic film according to  claim 1 , characterized in that said one or more intermediate layers comprise one or more ethylene ester polymers. 
   
   
       9 . A plastic film according to  claim 8 , characterized in that said one or more intermediate layers comprise one or more members of the group consisting of ethylene vinyl acetate copolymers, ethylene methyl acrylate copolymers, ethylene ethyl acrylate copolymers, ethylene methyl methacrylate copolymers, ethylene butyl acrylate copolymers and terpolymers of said polymers. 
   
   
       10 . A plastic film according to  claim 8 , characterized in that said one or more intermediate layers comprise an ethylene vinyl acetate copolymer. 
   
   
       11 . A plastic film according to  claim 8 , characterized in that said one or more intermediate layers comprise an ethylene methyl acrylate copolymer. 
   
   
       12 . A plastic film according to  claim 1 , characterized in that said sealing layer comprises an ethylene alpha-olefin plastomer copolymer. 
   
   
       13 . A plastic film according to  claim 1 , characterized in that said sealing layer comprises an ethylene-vinyl acetate copolymer. 
   
   
       14 . A plastic film according to  claim 1 , characterized in that said sealing layer comprises an ethylene alpha-olefin plastomer copolymer and an ethylene-vinyl acetate copolymer. 
   
   
       15 . A plastic film according to  claim 1 , characterized in that said barrier layer comprises one or more polyvinylidene chloride polymers selected from the group consisting of methyl acrylate-polyvinylidene chloride copolymer and vinylidene chloride copolymers. 
   
   
       16 . A plastic film according to  claim 1 , characterized in that said barrier layer comprises a methylacrylate-polyvinylidene chloride copolymer. 
   
   
       17 . A plastic film according to  claim 1 , characterized in that said one or more intermediate layers comprise one or more pigments. 
   
   
       18 . (canceled) 
   
   
       19 . A plastic film according to  claim 1 , characterized in that said sealing layer(s) comprise(s) additives in suitable amounts, such as to improve the machinability or other properties of the film. 
   
   
       20 . A plastic film according to  claim 19 , characterized in that said sealing layer(s) comprise(s) as said additives slip agents and/or polymer processing agents. 
   
   
       21 . A plastic film according to  claim 19 , characterized in that said sealing layer(s) comprise(s) said additives in an amount of 1-10 wt.-%. 
   
   
       22 . A plastic film according to  claim 19 , characterized in that said additives comprise 5% by weight of erucamide and 10% by weight of natural silica. 
   
   
       23 . (canceled) 
   
   
       24 . A plastic film according to  claim 1 , characterized in that said film is irradiated. 
   
   
       25 . A plastic film according to  claim 1 , characterized in that said film is a coextruded film. 
   
   
       26 . A plastic film according to  claim 1 , characterized in that said film is a hot-blown film. 
   
   
       27 . Process of chub packaging, comprising packaging a product with a film according to  claim 1 . 
   
   
       28 . A chub package made from the film of  claim 1 . 
   
   
       29 . A plastic film according to  claim 1 , wherein when the film has a thickness of about 67.5 to 68 microns, and the film has an impact resistance of 450 grams, measured in accordance with ASTM D 1709, but with the film chilled so that the film exhibits a measured surface temperature of 0° C.