Basell Poliolefine Italia, S.p.a.

Basell Polyolefine Gmbh

Daniele Bugada

Michael E Starsinic

Alexander Fuchs

Janine Emrich

A polypropylene resin comprising a propylene polymer endowed with the following characteristics: a) distribution of molecular weight Mw/Mn lower than 4; b) the melt-viscosity measured at a temperature of 250&#xb0; C. in the shear rate range between 1000 1/s and 40000 1/s meet the following relationship: c) h 9*e(&#x2212;0.00006*sr)+2 a. wherein h represents the melt-viscosity in Pas and sr the shear rate in 1/s d) the isotactic pentads (mmmm) measured with byC-NMR are higher than 90%; d) preferably higher than 92%; more preferably higher than 95% and most preferred higher than 96%; e) the hexane extractables according FDA regulations are preferably below 2.6 wt. %; and f) the xylene solubles are below 2 wt. %; with the proviso that the propylene polymer was not visbroken.

Propylene polymers

A polyolefin composition which contains 45 to 5 weight percent of a low viscosity propylene homopolymer having an as polymerized melt flow rate of 250 to 550 g/10 minutes and 55 to 95 weight percent of an olefin polymer composition, preferably a random copolymer of propylene and ethylene and/or a C alpha-olefin or mixtures thereof, containing from 90 to 99 weight percent propylene. The composition may be formed into fibers having a diameter of from 15 to 23 microns. The fibers may be used to produce nonwoven fabrics.

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Newark, DE, United States of America

Daniele Bugada