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Modified burn characteristic Saranex film

  • US 5,250,350 A
  • Filed: 12/03/1991
  • Issued: 10/05/1993
  • Est. Priority Date: 12/03/1991
  • Status: Expired due to Fees
First Claim
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1. A coextruded film having both gas barrier properties and modified burn characteristics, comprising:

  • a Saran resin barrier core layer having on both opposing faces a skin layer, at least one of the skin layers being predominantly a polyethylene selected from the group consisting of low density polyethylene and chlorinated polyethylene, blended with a fire retardant composition and a small amount of slip agent, the proportion of polyethylene being in the range of about 70 to 80 percent by weight, the proportion of fire retardant composition being in the range of about 8 to about 30 percent by weight, and the proportion of slip agent being in the range of about 2 to about 13 percent by weight;

    up to one of the skin layers being predominantly ethylene/vinyl acetate copolymer blended with the fire retardant composition and a small amount of slip agent, the proportion of ethylene/vinyl acetate copolymer being in the range of about 70 to 90 percent by weight, the proportion of fire retardant composition being in the range of about 8 to about 30 percent by weight, and the proportion of slip agent being in the range of about 1 to about 6 percent by weight;

    and wherein a skin layer is predominantly polyethylene, there being interposed between the skin layer and the barrier core layer a glue layer of predominantly ethylene/vinyl acetate copolymer blended with the fire retardant composition and a small amount of slip agent, the proportion of ethylene/vinyl acetate copolymer being in the range of about 70 to about 90 percent by weight, the proportion of fire retardant composition being in the range of about 8 to about 30 percent by weight, and the proportion of slip agent being in the range of about 1 to about 6 percent by weight;

    the respective layers being in approximate sequential volumetric relation, in percent, 35;

    10;

    10;

    10;

    35 wherein both skin layers are of predominantly low density polyethylene, and 35;

    10;

    10;

    10;

    45 wherein one of the skin layers is predominantly of chlorinated polyethylene and represents about 45 percent of the thickness of the film, and the other skin layer is a glue layer that is not covered; and

    the fire retardant composition being a polyhalogenated organic compound/antimony oxide blend in a low density polyethylene carrier.

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