Manufacture of film from partially crosslinked polyethylene

Details Manufacture of film from partially crosslinked polyethylene Manufacture of film from partially crosslinked polyethylene

1979-04-16

1980-10-07

Schain, Howard E.

Stock material or miscellaneous articles

Structurally defined web or sheet

Physical dimension specified

2041592, 264 22, 264209, 264236, 264563, 264564, 525240, 525335, 5263481, B29D 2304, C08F11002

Patent

active

042269059

ABSTRACT:
The present invention provides a process for the manufacture of a polyethylene film having improved tear strength in the transverse direction. The process involves extruding a partially crosslinked polyethylene into film having a thickness between 10 and 100 .mu.m, by a blown film process. The blow-up ratio is in the range of 1.2:1 to 4:1 and the MD draw-down ratio is in the range of 2 to 60. Polyethylenes used in the present invention had prior to being partially crosslinked a density in the range of 0.940 to 0.970 g/cm.sup.3 and a melt index in the range of 0.2 to 15.0 g/10 min. The polyethylene is crosslinked to an extent sufficient to provide a film having an Elmendorf tear strength in the transverse direction substantially less than the tear strength of film made from the uncrosslinked polyethylene. Crosslinking may be accomplished using any known method e.g. by irradiation, through use of crosslinking agents.
The film so produced is useful in packaging operations where transverse cutting or tearing performance of the film is important.

REFERENCES:
patent: 2981668 (1961-04-01), Brasch
patent: 3075948 (1963-01-01), Santelli
patent: 3144398 (1964-08-01), Rainer et al.
patent: 3144399 (1964-08-01), Rainer et al.
patent: 3201503 (1965-08-01), Benning et al.
patent: 3250825 (1966-05-01), Martinovich
patent: 3361861 (1968-01-01), Bertinotti et al.
patent: 3563870 (1971-02-01), Tung et al.
patent: 3592881 (1971-07-01), Ostapchenko
patent: 3646155 (1972-02-01), Scott
patent: 3663662 (1972-05-01), Golike et al.
patent: 3694524 (1972-09-01), Tinger et al.
patent: 3736218 (1973-05-01), Gregorian et al.
patent: 3891737 (1975-06-01), Marsh et al.

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