Polyethylene superthin film and a process for the production of

Details Polyethylene superthin film and a process for the production of Polyethylene superthin film and a process for the production of

1985-04-29

1986-07-15

Lieberman, Allan M.

Stock material or miscellaneous articles

Structurally defined web or sheet

Physical dimension specified

264204, 264212, 428339, 428523, B29C 4112, B29C 4322, B29K 2300, B29L 700

Patent

active

046006338

ABSTRACT:
A polyethylene superthin film having a thickness of at most 3 .mu.m, a tensile modulus of at least 2000 kg/cm.sup.2, a breaking strength of at least 500 kg/cm.sup.2 and a haze of at most 10% is produced by heating and dissolving polyethylene having a weight average molecular weight of at least 5.times.10.sup.5 in a solvent, forming a gel sheet from the resulting solution, subjecting the gel sheet to a solvent removal treatment to adjust the amount of the solvent in the gel sheet to 10 to 80% by weight, heating and stretching the sheet, removing the residual solvent therefrom and then subjecting the stretched product to a compressing treatment at a temperature of at most the melting point of the polyethylene.

REFERENCES:
patent: 3865674 (1975-02-01), Duling et al.
patent: 3933561 (1976-01-01), Larson et al.

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