Orineted coextruded barrier films of polyvinylidene chloride...

Details Orineted coextruded barrier films of polyvinylidene chloride... Orineted coextruded barrier films of polyvinylidene chloride...

B - Operations, Transporting

32

B

B32B 27/08 (2006.01) B29C 47/06 (2006.01) B29C 55/02 (2006.01) B32B 27/30 (2006.01) B32B 31/30 (1990.01)

Patent

CA 2077759

2077759 9113757 PCTABS00007 Disclosed are specific biaxially oriented, coextruded multilayer barrier films (10) having a normalized permeability of less than 1.5 x 10-13cc-cm/sq.cm-cm Hg-sec. The preferred barrier layer (20) of the films (10) comprises a copolymer of vinylidene chloride and an alkyl acrylate. Also disclosed are specific draw-tentering processes for preparing the barrier films (10) without destroying the barrier properties relative to the precursor undrawn film.

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