Process for the production of a biaxially highly oriented polypr

Details Process for the production of a biaxially highly oriented polypr Process for the production of a biaxially highly oriented polypr

1995-05-12

1998-06-16

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

26417315, 26417319, 2642107, 2642902, B29C 5512

Patent

active

057665320

ABSTRACT:
A process for the production of a biaxially oriented propylene polymer film contains, in its single ply (or, if it is a multi-ply film, in its base ply) a low molecular weight resin, and the film has improved stretchability and other desirable physical properties, even though the propylene polymer of the sole or base ply is preferably a homopolymer. The n-heptane-insoluble fraction of the film has a chain isotacticity index, measured by means of .sup.13 C-NMR spectroscopy, of at least 85 to 94%. The sole or base ply contains less than 10% by weight of resin. The film is stretched in such a way that the product of tensile strength in the longitudinal and transverse direction is greater than 50,000 (N/mm.sup.2).sup.2. The film is made by, among other steps, carrying out the orientation in the longitudinal and transverse directions such that the product of the longitudinal stretching ratio and the transverse stretching ratio is.gtoreq.60.

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Ullmanns Encyclopadie der technischen Chemie 4 Aufl., Bd. 12, pp. 525-555.

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