| 摘要 |
The disclosure is generally directed to an extrudable elastomeric composition formed by blending from at least 10 percent, by weight, of an A-B-A' elastomeric block copolymer where "A" and "A"' are each at thermoplastic endblock which includes a styrenic moiety and where "B" is an elastomeric poly(ethylene-butylene) midblock with up that least about 90 percent, by weight, of at least one 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. Fibrous nonwoven elastomeric webs may be formed from the extrudable composition and processes for forming the fibrous nonwoven elastomeric webs are also disclosed. In the disclosed method, the extrudable composition is subjected to a combination of elevated temperature and elevated pressure conditions to effect extrusion of the extrudable composition from a meltblowing die as molten threads. The heated, pressurized stream of an attenuating gas is applied to the molten threads to attenuate the molten threads to microfibers, and the microfibers are collected as a cohesion fibrous nonwoven elastomeric web. |
