W. R. Grace Co.-Conn.

W. R. Grace Co.

Thomas C Warren

Steven B Garland

The present invention provides a process for increasing the orientation rate during manufacturing a heat-shrinkable (oriented) polymeric film including: (a) introducing a pro-rad agent to a cross-linkable polymer by blending the cross-linking agent with the cross-linkable polymer, (b) extruding the blended cross-linkable polymer, (c) subjecting the extruded polymer to irradiation, (d) orienting the extruded polymer in at least one direction, and (e) recovering an oriented polymeric film, wherein (f) both the original amount of pro-rad agent and the dosage of irradiation are to an extent sufficient to provide an amount of cross-linking effective to accomplish an increased orientation rate during the orientation step.

Oriented polymeric films and process for enhanced orientation of

Described is the presence of both a chemical cross linking agent and irradiation such as electron beam irradiation, in the manufacturing process for making an oriented, i.e. heat-shrinkable, polymeric film. The presence of both results in an amount of cross-linking that is effective to accomplish an increased orientation rate during manufacturing.

Cross-linked multilayer heat-shrinkable oriented polymeric film

Described is the presence of both a pro-rad linking agent and irradiation such as electron beam irradiation, in the manufacturing process for making an oriented, i.e. heat-shrinkable, polymeric film. The presence of both results in an amount of cross-linking that is effective to accomplish an increased orientation rate during manufacturing.

Oriented polymeric films

Disclosed is a heat-shrinkable, oriented, multi-layer packaging film. The film has at least two layers comprising EVA. One of the EVA layers is of EVA having a melt index different from the melt index of the EVA of the other layer or layers.

Eva based multi-layer, heat-shrinkable, packaging film and bags made

Disclosed is a heat-shrinkable film suitable for making bags and pouches. The film has at least one layer comprising a copolymer of ethylene and an alphaolefin with six or more carbon atoms per molecule, said copolymer having a density of about 0.910 g/cc of less and a melt index of about 2 or less.

Thermoplastic multi-layer packaging film and bags made therefrom

Disclosed is a high abuse-resistance film suitable for making bags and pouches. The film has at least one layer comprising a linear copolymer of ethylene and an alpha-olefin with a density of about 0.935 g/cc or less. The copolymer has a comparatively lower I.sub.10 /I.sub.2 ratio than the corresponding ethylene/alpha-olefin with the same comonomer and essentially the same density and essentially the same melt index at condition 190/2.16.

Thermoplastic packaging film of low I.sub.10 /I.sub.2

Described is the presence of both a chemical cross-linking agent and irradiation such as electron beam irradiation, in the manufacturing process for making an oriented, i.e. heat-shrinkable, polymeric film. The presence of both results in an amount of cross-linking that is effective to accomplish an increased orientation rate during manufacturing.

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Greer, SC, United States of America

Thomas C Warren