Stock material or miscellaneous articles – Composite – Of polyamide
Patent
1990-03-09
1992-11-17
Buffalow, Edith L.
Stock material or miscellaneous articles
Composite
Of polyamide
428516, 428518, 428520, 428522, 4284752, 4284747, 428 354, 428483, 15624411, B32B 2708
Patent
active
051642689
ABSTRACT:
Disclosed are biaxially oriented, coextruded multilayer barrier films wherein a substantial degree of oxygen impermeability is retained after orientation. The barrier layer of the films comprise a copolymer of vinylidene chloride and an alkyl acrylate, wherein the copolymer has a melting point about equal to or less than the melting point of the thermoplastic material comprising the outer layers of the film and has an oxygen permeability of less than 0.25 cc-mil/100 sq. in.-atm-day based upon the thickness of the barrier layer. Further disclosed are biaxially oriented nonshrinkable multilayer barrier films having barrier layers of a copolymer of vinylidene chloride and from more than 6 to about 10 weight percent methyl acrylate. Further disclosed is a process for making the biaxially oriented, coextruded barrier films.
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"Encyclopedia of Polymer Science and Engineering", vol. 10, 2nd Edition, p. 633.
Dollinger Susan E.
Holton James E.
Luecke Robert A.
Buffalow Edith L.
The Dow Chemical Company
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