POLYESTER FILM CONTAINING FINE CELLS
Polyester film, contg. innumerable fine air bubbles (called fine closed cells), comprises aromatic polyester, crystalline polypropylene (3 to 40wt.% of polyester, preferred 5 to 30 wt%) and a surfactant (0.001 to 3 wt% of the total amount of polyester and polypropylene, preferred 0.005 to 1 wt%, esp...
Gespeichert in:
Hauptverfasser: | , , , |
---|---|
Format: | Patent |
Sprache: | eng ; fre ; ger |
Schlagworte: | |
Online-Zugang: | Volltext bestellen |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
Zusammenfassung: | Polyester film, contg. innumerable fine air bubbles (called fine closed cells), comprises aromatic polyester, crystalline polypropylene (3 to 40wt.% of polyester, preferred 5 to 30 wt%) and a surfactant (0.001 to 3 wt% of the total amount of polyester and polypropylene, preferred 0.005 to 1 wt%, esp. 0.01 to 0.5 wt%). The crystalline polypropylene has a melt-flow index of 0.2 to 120 (preferred 0.5 to 50) and 95 mol% or more of its composed of propylene units. The diameter of the fine air bubbles lies between 1 and 300 microm. The surfactant is at least one of anionic-surfactants, cationic-surfactants, anionic-cationic surfactants and nonionic surfactants. The polyester film is obtained by extrusion-moulding the above-mentioned coposition into a sheet and stretching in at least one direction. The apparent specific gravity is specified to lie between 0.4 and 1.3 g/cubic cm. The hiding power obtained by measurement of the transmittance with a G filter lies between 0.2 and 5. |
---|