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Polyolefin film containing cycloolefin polymer, process for the production thereof, and the use thereof

  • US 6,068,936 A
  • Filed: 09/30/1996
  • Issued: 05/30/2000
  • Est. Priority Date: 09/28/1995
  • Status: Expired due to Term
First Claim
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1. A film structure comprising a major amount of olefinic polymer which includes at least one mixed-polymer layer containing a non-cyclic polyolefin, hereafter referred to as a polyolefin, and a cycloolefin polymer, hereafter referred to as a COP, the polymer composition of said mixed-polymer layer being essentially homogeneous and comprising, based on the weight of said layer:

  • at least 50% by weight of polyolefin, anda polyolefin-compatible amount, which is less than 50% by weight, of COP,wherein said COP is essentially amorphous and has a mean molecular weight, Mw, in the range from 200 to 100,000, and the Mw of the COP ranges from 0.05 to at most 50% of the Mw of said polyolef in, said COP containing up to 20% by weight of comonomer.

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