NONORIENTED POLYPROPYLENE FILM Russian patent published in 2007 - IPC C08L23/14 C08J5/18 C08F10/06 

FIELD: polymer production.

SUBSTANCE: invention provides manufacture of nonoriented polypropylene film exhibiting good mechanical properties, workability, and enhanced water steam non-penetrability. Film is manufactured from polypropylene, which could be either propylene homopolymer and/or statistic propylene copolymer containing up to 1.5 wt % one or several C₄-C₈-α-olefins and/or ethylene, wherein polypropylene is characterized by degree of isotacticity ≥0.96 (as measured according to IR spectroscopy with Fourier transformation technique and calculated from peak ratio A998/A973), crystallization temperature Tc ≥ 120^о С (as measured by differential scanning spectroscopy technique in compliance to ISO 3146), and viscosity decrease index under shear-Hall instability SHI (0/50) ≥ 10 (calculated from rheological curve at 200^о С). Film of invention manifests reduced water steam passage velocities and can be used for food and non-food product packagings.

EFFECT: improved performance characteristics of film.

21 cl, 1 tbl, 5 ex