Patent ID: 8236904

Claim:
A meltblown nonwoven web comprising a bimodal polymer composition, comprising a blend of from about 60 to about 80 wt % of a first component which is a semi-crystalline poly(lactide) having a weight average molecular weight from about 300,000 to about 2,000,000 Daltons; and from about 20 to about 40 wt % of a second component which is a semi-crystalline poly(lactide) having a weight average molecular weight between about 10,000 to about 50,000 Daltons; wherein said blended polymer composition has a degree of crystallinity from about 10% to about 50%, and an isothermal crystallization half time of less than that of either individual blend component at a temperature of between 130° C. to 150° C., and said nonwoven web comprises microfibers having diameters ranging from 1 to 8 μm.