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Pouch for packaging flowable materials

  • US 5,288,531 A
  • Filed: 08/09/1991
  • Issued: 02/22/1994
  • Est. Priority Date: 08/09/1991
  • Status: Expired due to Term
First Claim
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1. A pouch containing a flowable material, said pouch being made from a film in tubular form and having transversely heat sealed ends, said film being made from a material comprising a film structure comprising (a) from 10 to 100 percent by weight of at least one polymeric seal layer of an ultra low density linear ethylene copolymer interpolymerized from ethylene and at least one alpha-olefin in the range of C3 -C10 and having (1) a density of from about 0.89 g/cm3 to less than 0.915 g/cm3, (2) a melt index of less than 10.0 g/10 minutes and (3) (i) a hot tack or heat seal initiation temperature of less than 100°

  • C. at a force of at least 1 N/inch (39.4 N/m) or (ii) a hot tack strength of at least 1 N/inch (39.4 N/m) at a seal bar temperature of about 110°

    C. and at a time of less than 0.2 seconds using the DTC Hot Tack Strength Method or a heat seal strength of at least 1 lbf /inch (175 N/m) at a seal bar temperature of about 110°

    C. and at a time of less than 0.25 seconds using the DTC Heat Seal Strength Method; and

    (b) from 0 to 90 percent by weight of at least one polymer selected from the group consisting of a linear copolymer of ethylene and a C3 -C18 -alpha-olefin having a density of greater than 0.916 g/cm3 and a melt index of from 0.1 to 10 g/10 minutes, a high-pressure low density polyethylene having a density of from 0.916 to 0.930 g/cm3 and a melt index of from 0.1 to 10 g/10 minutes and ethylene-vinyl acetate copolymer having a weight ratio of ethylene to vinyl acetate from 2.2;

    1 to 24;

    1 and a melt index of from 0.2 to 10 g/10 minutes.

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