Spunbond fibers and fabrics from polyolefin blends

A process for preparing spunbond fabric compositions comprising:

• a) providing a polyolefin blend composition comprising i) from about 60 to about 98 wt % of at least one random propylene copolymer having a comonomer content of from 8 to 25 wt % and a crystalline melting point (Tm) as determined by differential scanning calorimetry (DSC) from about 40 to about 110° C.;
• and ii) from about 2 to about 40 wt % of at least one substantially isotactic propylene homopolymer or copolymer comprising one or more C2 and/or C4-C8 comonomer, having a crystalline melting point (Tm) as determined by DSC greater than or equal to 120° C;
• b) subjecting the blend to a controlled rheology process so as to achieve a melt flow rate (MFR) of from about 100 dg/min to about 500 g/10 min;
• c) drawing the blend to into fibers having a diameter of about 10 to about 40 microns;
• and
• d) laying the fibers randomly on a moving belt and bonding by heat.

A process for preparing spunbond fabric compositions comprising:

• a) providing a polyolefin blend composition comprising i) from about 60 to about 98 wt % of at least one random propylene copolymer having a comonomer content of from 8 to 25 wt % and a crystalline melting point (Tm) as determined by differential scanning calorimetry (DSC) from about 40 to about 110° C.;
• and ii) from about 2 to about 40 wt % of at least one substantially isotactic propylene polymer comprising one or more C2 and/or C4-C8 comonomer, having a crystalline melting point (Tm) as determined by DSC greater than or equal to 120° C.;
• wherein the random propylene copolymer and the substantially isotactic propylene polymer are selected such that the MFR of the resulting blend is between about 100 and about 500;
• b) drawing the blend to into fibers having a diameter of about 10 to about 40 microns;
• and
• c) laying the fibers randomly on a moving belt and bonding by heat.