Biaxially oriented multilayered polyolefin film sealable on both

Details Biaxially oriented multilayered polyolefin film sealable on both Biaxially oriented multilayered polyolefin film sealable on both

1991-12-06

1998-06-30

Zirker, Daniel

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Adhesive outermost layer

428516, 428517, 428519, B32B 712, B29D 300

Patent

active

057731420

ABSTRACT:
A transparent, coextruded mutilayered polyolefin film which can be sealed on both sides and having a base layer essentially comprised of a resin-modified propylene polymer and top layers essentially comprised of sealable olefin polymers. At 120.degree. C., the multilayered film has a shrinkage in the longitudinal direction of more than 7% and a shrinkage in the transverse direction of more than 5%. The base layer of the film is essentially comprised of a peroxidically degraded propylene polymer, with the degradation factor A being in the range of 3 to 10, and it contains 5 to 25% of a hydrocarbon resin. The top layers of the multilayered film are essentially comprised of a random ethylene/propylene copolymer having an ethylene content of 2 to 8% by weight, a distribution factor V.sub.F of more than 8, and a thermooxidation temperature T.sub.OX of more than 230.degree. C. The film exhibits a surface gloss (angle of measurement 20.degree.) of more than 100 and a haze (measured on four superimposed film plies) of less than 22%.

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