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US 5,314,749 AGranted
High density polyethylene shrink film
AssigneeW.R. Grace & Co.-Conn.
InventorGautam P. Shah
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Abstract
A multiple layer shrink film with improved moisture barrier properties is oriented in the longitudinal and/or transverse directions, and comprises an internal layer comprising high density polyethylene, and outer layers each comprising olefinic polymer or copolymer. Intermediate polymeric adhesive layers can optionally be included in those coextruded embodiments which do not melt bond adequately in the absence of such intermediate layers.
Claims5
A biaxially oriented multilayer shrink film comprising:
- (a) an internal layer consisting essentially of a high density polyethylene;
- and
- (b) two outer layers each comprising olefinic polymer or copolymer;
- wherein the two outer layers each comprise an olefinic polymer or copolymer selected from the group consisting of ethylene vinyl acetate copolymer, ethylene alkyl acrylate copolymer, linear medium density polyethylene, linear low density polyethylene, and very low density polyethylene.
1 more element
Dependencies are inferred from the claim text.