Polyester resin blends with high-level gas barrier properties

  • US RE42,925 E1
  • Filed: 11/17/2008
  • Issued: 11/15/2011
  • Est. Priority Date: 06/11/1998
  • Status: Expired due to Term
First Claim
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1. A biaxially-oriented article selected from the group consisting of biaxially-oriented films and containers formed by using a material obtained by mixing a melted substance comprising:

  • a) an aromatic polyester, premixed with a dianhydride of a tetracarboxylic acid in an amount from 0.01 to 3% by weight;

    b) a polyamide derived from m-xylylene diamine and from a dicarboxylic acid with 6-22 carbon atoms in an amount from 2 to 50% by weight on the sum of a)+b), wherein the polyamide is dispensed in the polyester in domains with an average size lower than 1 micron.

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