Patent ID: 9533477
Date: 2017-01-03
CPC Classifications: B29C,B29K,B29L,B32B,B65B

Claim:
1. A multi-layer film for making pouches for containing flowable materials, said multilayer film consisting of the following layers in order, an at least one inner sealant-layer, a first at least one interposed layer adjacent to said one inner sealant layer, an at least one core layer adjacent to said interposed layer, an at least a second interposed layer adjacent to said core layer and at an at least one outer sealant-layer adjacent to said second interposed layer: (A) said at least one inner sealant-layer and said outer sealant layer each consisting of: (i) from about 85 to about 98 parts by weight of a low-density copolymer of ethylene and an at least one C (ii) from about 2 to about 15 parts by weight of an additional at least one low-density copolymer of ethylene and an at least one C (B) said first at least one interposed layer adjacent to said at least one inner sealant layer and said second interposed layer each consisting of: (i) at least one polypropylene interpolymer in the range of from about 40 to about 95 parts by weight of said first at least one interposed layer, wherein said polypropylene interpolymer has a melt-index in the range of from about 0.45 to about 0.75 dg/min, at least one high-density polyethylene is in the range of from about 0 to about 50 parts by weight of said first at least one interposed layer, wherein said at least one high-density polyethylene is manufactured in a polymerization process using a single-site polymerization catalyst or a Ziegler-Natta catalyst, wherein said at least one high-density polyethylene has a density greater than about 0.935 g/cm (ii) at least one ethylene-alpha olefin copolymer in the range from 0 to about 15 parts by weight of said first at least one interposed layer, wherein at least one C (iii) at least one additional ethylene-alpha-olefin copolymer in the range of from about 0 parts to 15 parts by weight, manufactured in a polymerization process using either a single-site or Zeigler-Natta polymerization catalyst, wherein said copolymer has a density in the range of from about 0.909 to about 0.935 g/cm (C) at least one core layer, adjacent to said first at least one interposed layer and said second interposed layer, said core layer consisting of: i) at least one low density ethylene-alpha olefin copolymer in the range from 35 to about 85 parts by weight of said at least one core layer manufactured in a polymerization process using either a single-site or ZeiglerNatta polymerization catalyst, wherein said copolymer has a density in the range of from about 0.909 to about 0.935 g/cm (ii) an at least one low-density copolymer of ethylene and an at least one C (iii) at least one low-density ethylene homopolymer or copolymer, made in a high pressure polymerization process, in the range of from about 10 parts to 50 parts by weight of said at least one core layer, wherein the ethylene homopolymer has a density in the range of from about 0.918 to about 0.923 g/cm wherein a combined thickness of said inner sealant-layer and said outer sealant-layer is in a range of from about 10% to about 27% of the total thickness of said multi-layer film wherein the combined thickness of said first and second interposed layers is in the range of from about 10% to about 27% of the total thickness of said multi-layer film, wherein the core layer thickness ranges from about 46% to about 80% of the total thickness of the multi-layer film, and wherein said multi-layer film thickness is in the range of from about 38 microns to about 63 microns.