| abstract |
The present invention relates to an intermediate web comprising of high glass transition polymer fibers. The fibers are spun at low to moderate speeds and have a relative crystallinity of from 10% to 75% of the maximum achievable crystallinity. The intermediate web is a low crystallinity web that exhibits shrinkage of more than 30% and elongation to break of more than 80% at high strain rates. This web can be heat treated to reduce shrinkage to less than 15% while the web is capable of at least about 60% elongation at a strain rate of at least about 50 second<-1>. |