Wood fiber-filled polypropylene
OwnerPhilip Jacoby, William H. Crostic +1inventors
InventorsPhilip Jacoby, William H. Crostic, Richard G. Sullivan
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Abstract
Compositions comprising highly crystalline propylene polymer having an nmr tacticity index of at least 94, wood fiber, and, optionally, a functionalized olefin polymer such as maleated polypropylene exhibit substantial improvement in resistance to moisture and excellent creep properties, particularly at elevated temperatures. Such compositions are particularly useful in providing extruded outdoor building components such as decking.
Claims32
A composition comprising highly crystalline propylene polymer having an NMR tacticity index of at least 94 and a cellulosic fiber.
A composition comprising highly crystalline propylene polymer having an NMR tacticity index of at least 94, from about 0.3 to about 12 wt. % of a functionalized olefin polymer and a cellulosic fiber.
A building component comprising from about 30 to about 85 wt. % highly crystalline propylene polymer having an NMR tacticity index of at least 94, a melt flow rate (MFR) of from about 5 to about 50 g/10 min and Mw/Mn in the range of from about 7 to about 15 and from about 15 to about 70 wt. % wood fiber.
An extruded decking component having improved resistance to moisture comprising from about 30 to about 85 wt. % highly crystalline propylene polymer having an NMR tacticity index of at least 94, a melt flow rate (MFR) of from about 5 to about 50 and Mw/Mn in the range of from about 7 to about 15;
- from about 0.5 to about 10 wt. % maleated polypropylene having a maleation level of from about 0.4 to about 2 wt. %;
- and from about 15 to about 70 wt. % cellulosic fiber.
A decking component comprising wood fiber-filled, highly crystalline propylene polymer having an NMR tacticity index of at least 94, said decking component having a 1000 hour creep deformation measured in tension at 60° C. and 3.5 MPa of less than about 0.30% total strain.
Dependencies are inferred from the claim text.