Toa Nenryo Kogyo Kabushiki Kaisha

Tadao Yoshino

Yasushi Itaba

Yutaka Yoshifuji

Minoru Izawa

Takayoshi Kondo

Ichiro Sakamoto

Keichiro Saitoh

Jyoichi Tabuchi

Keichiro Saito

An oriented polyethylene film with an excellent moistureproofness and optical property is provided in which the degree of crosslinking is uniform or decreases inwardly across the thickness of the film, and which consists of a composition comprising (A) 50 to 90% by weight of polyethylene with a density of at least 0.935 g/cm.sup.3 and a high load melt index to melt index ratio of at most 100 and (B) 50 to 10% by weight of a petroleum resin or linear low density polyethylene.

Oriented polyethylene film

A polyethylene composite film suitable for packaging, which is superior in moistureproofness, flex-o-crack resistance, tearability and heat-sealing property, is provided comprising an oriented polyethylene film such that the degree of cross-linking inwardly decreases across the thickness of the film and at least one lamination layer, provided on one side of the oriented polyethylene film consisting of a lamination material having a heat shrinkage of less than 5% at 120.degree. C.

Polyethylene composite film

A crosslinked and oriented polyethylene film superior in clarity as well as moistureproofness and having an improved stretchability is produced by a process for producing a crosslinked and oriented polyethylene film such that the degree of crosslinking inwardly decreases across the thickness of the film, comprising using a polyethylene having a density of at least 0.935 g/cm.sup.3, a melt index of 0.5 to 20 g/10 min and a high-load melt index to melt index ratio of 40 to 200.

Process for producing a crosslinked and oriented polyethylene film

An oriented film is prepared by crosslinking a sheet of polyethylene (preferably HDPE) containing particulate inorganic slip and antiblock additions to provide maximum crosslinking at the surfaces of the sheet and minimum orientation at its middle layer portion, and thereafter heating and stretching the film to obtain an oriented HDPE of high clarity film of improved moisture proof.

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Saitama, Japan

Tadao Yoshino