Polyolefin-containing extrudable compositions and methods for their formation into elastomeric products including microfibers

A conformed fibrous nonwoven elastomeric web including:

• at least about 20 percent, by weight, of a fibrous nonwoven elastomeric web of microfibers, said microfibers comprising:
• at least about 10 percent, by weight, of an A-B-A' block copolymer where "A" and "A'" are each a thermoplastic endblock which includes a styrenic moiety and where "B" is an elastomeric poly(ethylene-butylene) midblock;
• and
• from greater than 0 percent, by weight, up to about 90 percent, by weight, of a polyolefin which, when blended with the A-B-A' block copolymer and subjected to an effective combination of elevated temperature and elevated pressure conditions, is adapted to be extruded, in blended form, with the A-B-A' block copolymer;
• and
• from greater than 0 percent, by weight, to about 80 percent, by weight, of at least one secondary fiber generally uniformly distributed throughout the fibrous nonwoven elastomeric web.

A coformed fibrous nonwoven elastomeric web including:

• from at least about 30 percent, by weight, to about 70 percent, by weight, of a cohesive fibrous nonwoven elastomeric web of microfibers comprising:
• from at least about 10 percent, by weight, to about 90 percent, by weight, of an A-B-A' block copolymer where "A" and "A'" are each a thermoplastic polystyrene endblock, and where "B" is an elastomeric poly(ethylene-butylene) midblock;
• and where the sum of the molecular weight of the "A" endblock with molecular weight of the "A'" endblock is about 14 percent of the molecular weight of the A-B-A' block copolymer, and
• from at least about 10 percent, by weight, to about 90 percent, by weight, of a polyethylene having a density of about 0.903 grams per cubic centimeter which, when blended with the A-B-A' block copolymer and subjected to an effective combination of elevated temperature and elevated pressure conditions, is adapted to be extruded, in blended form, with the A-B-A' block copolymer;
• and
• from at least about 30 percent, by weight, to about 70 percent, by weight, of at least one secondary fiber generally uniformly distributed throughout the cohesive web.

A coformed fibrous nonwoven elastomeric web including:

• from at least about 30 percent, by weight, to about 70 percent, by weight, of a cohesive fibrous nonwoven elastomeric web of microfibers comprising:
• from at least about 50 percent, by weight, to about 90 percent, by weight, of an A-B-A' block copolymer where "A" and "A'" are each a thermoplastic polystyrene endblock and where "B" is an elastomeric poly(ethylene-butylene) midblock, and
• from at least about 10 percent, by weight, to about 50 percent, by weight, of a polyethylene having a Brookfield Viscosity, cP at 150 degrees Centigrade of about 8500 and at 190 degrees Centigrade of about 3300 when measured in accordance with ASTM D 3236 and a density of about 0.903 grams per cubic centimeter which, when blended with the A-B-A' block copolymer and subjected to an effective combination of elevated temperature and elevated pressure conditions, is adapted to be extruded, in blended form, with the A-B-A' block copolymer;
• and
• from at least about 30 percent, by weight, to about 70 percent, by weight, of at least one secondary fiber generally uniformly distributed throughout the cohesive web.

A coformed fibrous nonwoven elastomeric web consisting essentially of:

• from at least about 30 percent, by weight, to about 70 percent, by weight, of a cohesive fibrous nonwoven elastomeric web of microfibers comprising:
• from at least about 50 percent by weight, to about 90 percent, by weight, of an A-B-A' block copolymer where "A" and "A'" are each a thermoplastic polystyrene endblock and where "B" is an elastomeric poly(ethylene-butylene) midblock;
• from about 10 percent by weight, to about 50 percent, by weight, of a polyethylene having a Brookfield Viscosity, cP at 150 degrees Centigrade of about 8500 and at 190 degrees Centigrade of about 3300 when measured in accordance with ASTM D 3236 and a density of about 0.903 grams per cubic centimeter which, when blended with the A-B-A' block copolymer and subjected to an effective combination of elevated temperature and elevated pressure conditions, is adapted to be extruded, in blended form, with the A-B-A' block copolymer, and
• from at least about 30 percent, by weight, to about 70 percent, by weight, of at least one secondary fiber generally uniformly distributed throughout the cohesive web.