Process of preparing a pouch for packaging flowable materials
AssigneeThe Dow Chemical Company
InventorsDaniel J. Falla, Michael C. Restaino
Life of this patent
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Abstract
An environmentally friendly polymer film pouch made from a homogeneously branched substantially linear ethylene interpolymer film structure for the packaging of flowable materials such as milk, the pouch includes, for example, a multilayer film structure such as a two-layer or a three-layer coextruded film containing at least one seal layer of a homogeneously branched substantially linear polyethylene. A process for making a pouch for packaging flowable materials using a homogeneously branched substantially linear ethylene interpolymer film structure is also disclosed.
Claims17
A process of preparing a pouch in a vertical form containing a flowable material comprising the steps of forming a film structure;
- forming the film structure into a tubular member;
- heat-sealing longitudinal edges and first transverse end of the tubular member to form the pouch;
- filling the pouch with the flowable material;
- and sealing a second transverse end of the tubular member, the film structure having at least one layer comprising:
- (a) from 10 to 100 percent by weight of at least one homogeneously branched substantially linear ethylene/.alpha.-olefin interpolymer, and
- (b) from 0 to 90 percent by weight of at least one polymer selected from the group consisting of a heterogeneously branched linear ethylene/C.sub.3 -C.sub.18 .alpha.-olefin copolymer, a high-pressure low density polyethylene and an ethylene/vinyl acetate copolymer.
A process of preparing a pouch in a vertical form containing a flowable material comprising the steps of forming a film structure;
- forming the film structure into a tubular member;
- heat-sealing longitudinal edges and first transverse end of the tubular member to form the pouch;
- filling the pouch with the flowable material;
- and sealing a second transverse end of the tubular member, the film structure having at least one layer comprising:
- (I) (a) from 10 to 100 percent by weight of at least one homogeneously branched substantially linear ethylene/.alpha.-olefin interpolymer, and
- (b) from 0 to 90 percent by weight of at least one polymer selected from the group consisting of a heterogeneously branched linear ethylene/C.sub.3 -C.sub.18 .alpha.olefin copolymer, a high-pressure low density polyethylene and an ethylene/vinyl acetate copolymer;
- and at least one layer comprising:
- (II) a heterogeneously branched linear ethylene/C.sub.3 -C.sub.18 .alpha.-olefin copolymer having a density greater that about 0.87 g/cm.sup.3 and a melt index from about 0.1 to about 10 g/10 minutes.
Dependencies are inferred from the claim text.