Coextruded polyolefin films having improved barrier properties

Details Coextruded polyolefin films having improved barrier properties Coextruded polyolefin films having improved barrier properties

1989-11-03

1992-08-25

Lesmes, George F.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Adhesive outermost layer

4284761, 428484, 428523, 428516, B32B 712, B32B 1504

Patent

active

051418010

ABSTRACT:
The barrier properties of a coextruded film having a surface layer comprising a crystalline polyolefin can be improved substantially by incorporating a precise amount of a partially incompatible wax into the polyolefin. The film has an interior layer comprising a polymer that prevents migration of the wax to the other surface of the film so that wax does not interfere with the printability or heat sealability of the other surface. The wax-containing polyolefin layer also protects the interior layer from adverse effects of moisture, such as when the interior layer comprises EVOH. An interior layer of EVOH may be sandwiched between wax-containing polyolefin layers to fully protect it from moisture.

REFERENCES:
patent: 3182033 (1965-05-01), Gregorian
patent: 3447883 (1969-06-01), Boyer et al.
patent: 3536644 (1970-10-01), Frizelle et al.
patent: 4442243 (1984-04-01), Woodhams
patent: 4612221 (1986-09-01), Biel et al.
patent: 4767651 (1988-08-01), Starczewski et al.
"Plastic Films and Packaging"; C. R. Oswin; Halsted Press; 1975; pp. 5, 26, 124, and 138 plus 42-43.

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