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Polymethylpentene/polypropylene blend and film

  • US 5,534,593 A
  • Filed: 05/23/1995
  • Issued: 07/09/1996
  • Est. Priority Date: 04/27/1993
  • Status: Expired due to Term
First Claim
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1. A release film comprising a blend of:

  • (A) from about 90% to about 10% by weight of polymethylpentene, wherein the polymethylpentene has a molecular weight from about 200,000 to about 700,000, and a melt flow rate between from about 30 grams/10 minutes to about 200 grams/10 minutes; and

    (B) from about 10% to about 90% by weight of polypropylene, wherein the polypropylene has a weight average molecular weight from about 150,000 to about 350,000, and a melt flow rate between from about 1 gram/10 minutes to about 10 grams/10 minutes;

    whereby the blend of (A) and (B) has an elongation greater than about 250% and a release load less than about 0.60 lb/in.

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