Multi-Layer Polymeric Films

摘要

Multi-layer polymeric films and methods of forming the same are provided. The film includes a combination of layers forming the core of the film, and a polymeric skin layer forming each of the outer surfaces of the multi-layer film. The combination of layers forming the core of the film includes: a polypropylene-rich “A” layer, in which polypropylene is the major component of the “A” layer; and a polyethylene-rich “B” layer, in which polyethylene is the major component of the “B” layer. In some cases, the “B” layer may have high density polyethylene as its major component. In the core, there is at least one “A” layer and at least one “B” layer, and the “B” layer is joined at least indirectly to the “A” layer. The “A” layer(s) and the “B” layer(s) combine to make up 20% to 60% of the thickness of the multi-layer polymeric film.

主权项

1. A multi-layer polymeric film having two outer surfaces and a thickness, said film comprising:
a combination of layers forming the core of said film, said combination of layers comprising:
a) at least one polypropylene-rich “A” layer having a thickness, wherein polypropylene is the major component of the “A” layer, wherein the thickness of the “A” layer(s) comprises from about 10% to about 30% of the thickness of the multi-layer polymeric film; andb) at least one polyethylene-rich “B” layer having a thickness, comprising high density polyethylene (HDPE) as the major component, wherein said “B” layer is joined at least indirectly to said “A” layer, wherein the thickness of the “B” layer(s) comprises from about 10% to about 30% of the thickness of the multi-layer polymeric film, wherein each “A” layer and each “B” layer has a thickness of greater than or equal to about 0.05 micrometers to less than or equal to about 15 micrometers; and a pair of polymeric skin layers, one skin layer forming each of the outer surfaces of said multi-layer polymeric film, wherein the skin layers have a combined thickness that is between about 40% to about 80% of the film thickness, and said combination of layers forming the core of the film is at least indirectly joined to said skin layers.