B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 55/12 (2006.01) B29C 55/00 (2006.01) B32B 27/32 (2006.01) C08F 8/00 (2006.01)
Patent
CA 2149376
The disclosed 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 isotaxy index, measured by means of 13C-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/mm2)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 >= 60.
Busch Detlef
Lohmann Harald
Murschall Ursula
Peiffer Herbert
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
Trespaphan Gmbh
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