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Method of producing a weld-cut sealing/heat-shrinkable packaging film formed of a polyethylene terephthalate-based block copolymer polyester

  • US 20070052131A1
  • Filed: 09/21/2004
  • Published: 03/08/2007
  • Est. Priority Date: 09/22/2003
  • Status: Abandoned Application
First Claim
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1. A method of producing a weld-cut sealing/heat-shrinkable packaging film formed of a PET-based block copolymer polyester, characterized by comprising:

  • melting at a temperature of 250°

    C. or above a mixture “

    A”

    comprising;

    (1) 100 parts by weight of a polyethylene terephthalate (PET)-based polyester “

    a”

    having a melt flow rate (MFR, JIS method;

    280°

    C., load of 2.16 Kg) of 45 to 130 g/10 minutes as a main raw material;

    (2) 10 to 100 parts by weight of an ethylene glycol/cyclohexane dimethanol/phthalic acid copolyester “

    b”

    as an auxiliary material;

    (3) 2 to 20 parts by weight of a polyester elastomer “

    c”

    as another auxiliary material;

    (4) 0.1 to 2 parts by weight of a mixture “

    f”

    containing a compound “

    d”

    having two epoxy groups and a compound “

    e”

    having three or more epoxy groups in a weight ratio of (95 to

         40)/(5 to

         60) as a binder; and

    (5) 0.05 to 1 part by weight of an organic acid metal salt “

    g”

    as a catalyst;

    turning the mixture “

    A”

    into block copolymer pellets by subjecting it to a uniform reaction under deaeration and dehydration in vacuum;

    molding a mixture comprising 100 to 10 parts by weight of the block copolymer pellets and 0 to 90 parts by weight of PET “

    B”

    having an intrinsic viscosity of 0.60 to 0.80 dL/g into an unoriented film through a casting method; and

    extending the unoriented film into an oriented film through a biaxial orientation method.

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