البحث في مجموعات البراءات الوطنية والدولية

1. (WO2006115585) PERMEABLE POLYPROPYLENE FILM

Pub. No.:    WO/2006/115585    International Application No.:    PCT/US2006/007751
Publication Date: 02/11/2006 International Filing Date: 03/03/2006
IPC: B32B 27/20
B32B 27/32
C08K 3/22
C08K 5/092
C08K 5/098
B32B 27/18
Applicants: EXXONMOBIL OIL CORPORATION
KONG, Dan-Cheng
LERNOUS, Etienne, R., H.
SHEPPARD, Robert, M.
Inventors: KONG, Dan-Cheng
LERNOUS, Etienne, R., H.
SHEPPARD, Robert, M.
Title: PERMEABLE POLYPROPYLENE FILM
Abstract:
A permeable, propylene-containing film structure including a core layer containing a propylene polymer matrix that has been cavitated by a two- component cavitation system, wherein the first component of the two-component cavitation system is a beta-nucleating agent to produce the beta-crystalline form of polypropylene and the second component is a filler. The film structure also includes first and second thermoplastic skin layers on either side of the core layer, respectively. A method of manufacturing a permeable propylene-containing film structure, including: forming a melt containing a propylene polymer, a beta- nucleating agent and a filler; cooling the melt to form a film layer; and stretching the film layer. The film structure has a water vapor transmission rate greater than 300 g/m2/day and a Gurley air permeability less than 3,000 s/10 cc.