Polypropylene films

Details Polypropylene films Polypropylene films

2008-01-01

2008-01-01

Nutter, Nathan M. (Department: 1711)

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

Synthetic resins

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

C525S240000

Reexamination Certificate

active

07314901

ABSTRACT:
Films disclosed herein contain a base or core layer comprising a first polypropylene, a second polypropylene, and a hydrocarbon resin. The base layers may also include other additives as described below. The first polypropylene is preferably a high crystallinity polypropylene having a melting point above about 155° C. or a polypropylene having a polydispersity (Mw/Mn) greater than about 4.0. The second polypropylene may be any conventional polypropylene, preferably having a melting point below about 160° C. and/or a polydispersity less than about 5.0.

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patent: 5994482 (1999-11-01), Georgellis et al.
patent: 6485817 (2002-11-01), DeMeuse
patent: 6747114 (2004-06-01), Karandinos et al.
patent: 6777067 (2004-08-01), Speith-Herfurth et al.
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patent: 2004/0249046 (2004-12-01), Abhari et al.
patent: WO 98/04403 (1998-02-01), None
patent: WO 98/41571 (1998-09-01), None
patent: WO 01/40358 (2001-06-01), None

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