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US 9,637,602 B2Granted
BOPP film with improved stiffness/toughness balance
AssigneeBorealis AG
InventorsGregory Potter, Dietrich Gloger, Thomas Horill, Antonis Gitsas, Franciscus Jacobs, Matthew Parkinson
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Abstract
The present invention relates to a new biaxially oriented polypropylene (BOPP) film, a process for the preparation of such film as well as the use of a polypropylene for the preparation of such film and an article comprising such film.
Claims16
A biaxially oriented polypropylene (BOPP) film comprising a polypropylene (PP), wherein the biaxially oriented polypropylene (BOPP) film has
- a) a modulus of elasticity in transverse direction (TD) of at least 5 000 N/mm2, and
- b) an elongation at break in machine direction (MD) of at least 170%, and
- wherein the polypropylene (PP) is a random polypropylene copolymer (C-PP) having
- i) a melting temperature (Tm) measured by differential scanning calorimetry (DSC) in the range of from 164 to 169° C.,
- ii) a xylene cold soluble fraction (XCS) determined at 25° C. according to ISO 16152 in the range of from 1.0 to 3.5 wt %, and
- iii) a content of ethylene units in the range of from 0.01 to 0.5 wt %, based on the total weight of the random polypropylene copolymer (C-PP).
3 more elements
Dependencies are inferred from the claim text.