Exxonmobil Chemical Patents Inc.

Robert F Bahm

Bruce Alan Harrington

Smita Kacker

Vetkav Rajagopalan Eswaran

Paul E Rollin, Jr

Vetkav R Eswaran

A method for forming a fiber, the method comprising charging to a reactive extruder a first polymer and a second polymer to form an initial blend, where the first polymer is a propylene-based elastomer including up to 35% by weight ethylene-derived units and a heat of fusion, as determined according to DSC procedures according to ASTM E-793, of less than 80 J/g and a melt temperature of less than 110&#xb0; C., where the second polymer is a propylene-based polymer having a melt temperature in excess of 110&#xb0; C. and a heat of fusion in excess of 80 J/g, and introducing the reactive blend to a spinneret to form a fiber or extruding the reacted blend through a plurality of die capillaries to form molten threads or filaments which are attenuated in a gas stream to form meltblown fibers.

Process for forming polymer blends

A method for forming a polymer blend, the method comprising charging to a reactive extruder a first polymer and a second polymer to form an initial blend, where the first polymer is a propylene-based elastomer including up to 35% by weight ethylene-derived units and a heat of fusion, as determined according to DSC procedures according to ASTM E-793, of less than 80 J/g and a melt temperature of less than 110&#xb0; C., where the second polymer is a propylene-based polymer having a melt temperature in excess of 110&#xb0; C. and a heat of fusion in excess of 80 J/g.

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Pass Christian, MI, United States of America

Robert F Bahm