Biaxially oriented polypropylene film

Details Biaxially oriented polypropylene film Biaxially oriented polypropylene film

2007-12-18

2007-12-18

Tarazano, D. Lawrence (Department: 1773)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C428S910000, C428S461000

Reexamination Certificate

active

10416396

ABSTRACT:
A biaxially stretched polypropylene film of the present invention has high stiffness in the film longitudinal direction and can be manufactured by a conventional longitudinal-transverse sequential biaxial stretching method, since the biaxially stretched polypropylene film comprises a polypropylene which comprises a polypropylene having controlled specific values of a melt strength (MS) and a melt flow rate (MFR) at 230° C. or consists of a polypropylene having controlled specific values of a melt strength (MS) and a melt flow rate (MFR) at 230° C. and/or a Trouton ratio of the polypropylene is controlled at a specific value, moreover, the biaxially stretched polypropylene film contains regulated longitudinal fibrils.

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Cimmino et al. “Blends of Isotactic Polypropylene and Natural Terpene Resins, I Phase Structure, Thermal, and Dynamic—Mechanical Properties”, Journal of Polymer Science vol. 37, (867-878), 1999.

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