The metallocene based 2 axial stretching polypropylene thin film which decreases thickness

摘要

The polymer thin film which possesses the barrier quality which confronts both parties of thickness, and vapor and oxygen of 10 microns and or less improves, is formed from 2 axial stretching polypropylene thin film of the isotactic polypropylene. This polypropylene under iso unique metallocene catalyst existing, is produced by the polymerization of propylene. This thin film, permeability, and has the permeability for approximately 2200cc/m2 day/25 millimicrons for the vapor under approximately 2.5g/m2 day/25 millimicrons the oxygen under. As for this film, in addition, it possesses also the haze quality under approximately 1%. This polypropylene includes 0.1 - 1% 2,1 insertions, possesses the isotactic characteristic of 96% mesopendatsudo at least. This way the isotactic polypropylene which is produced extrusion forms in seat condition, in order in intersection direction at least at least to become stretching ratio of approximately 4:1 in approximately 6:1, and longitudinal direction by adding the stress of intersection direction and longitudinal direction to the seat next, 2 axial stretching is done.