초록 ▼

The present invention relates to a method for making a multilayer coextruded thermoplastic stretch wrap film useful for the packaging or pelletizing of goods. More particularly films made according to this invention include at least three layers: two outer layers and an intermediate layer positioned

The present invention relates to a method for making a multilayer coextruded thermoplastic stretch wrap film useful for the packaging or pelletizing of goods. More particularly films made according to this invention include at least three layers: two outer layers and an intermediate layer positioned between the outer layers. The intermediate layer contains a mixture of a first linear low density polyethylene and a polyolefin selected for the group consisting of homopolymers of propylene, copolymers of propylene and ethylene and mixtures thereof. At least one of the two outer layers is a second polyethylene. The force required to stretch films made according to this method is controlled by varying the intermediate layer blend ratio between 85% polyethylene/15% propylene and 95% polyethylene/5% propylene.

대표청구항 ▼

A method for preparing a thermoplastic stretch wrap film capable of stretching upon exerting a force during application of the film to an article or group of articles to be wrapped comprising the step of: coextruding a film having at least three layers, said three layers having two outer layers and

A method for preparing a thermoplastic stretch wrap film capable of stretching upon exerting a force during application of the film to an article or group of articles to be wrapped comprising the step of: coextruding a film having at least three layers, said three layers having two outer layers and an intermediate layer positioned between said outer layers, said intermediate layer comprising a mixture of: a) a first linear low density polyethylene and b) a polyolefin selected from the group consisting of: i) homopolymers of propylene, ii) copolymers of propylene and ethylene and mixtures thereof, wherein the amount of force required to stretch the stretch wrap film can be controlled by adjusting the blend ratio of said mixture from 95% propylene homopolymer/5% linear low density polyethylene to 85% propylene homopolymer/15% linear low density polyethylene, and at least one of said two outer layers comprising a second linear low density polyethylene, said second linear low density polyethylene consisting essentially of ethylene copolymerized with at least one alpha olefin having from 4 to 10 carbon atoms and containing from 3.5 to 15 weight percent n-hexane extractibles, said n-hexane extractibles being present in an amount sufficient to cause the stretch wrap film to exert a cling force of at least about 200 grams when in surface-to-surface contact with itself or another surface when used in the stretch overwrap packaging of articles.