Patent ID: 8287909

Claim:
A non-woven comprising fibers of poly-4-hydroxybutyrate or copolymer thereof having a weight average molecular weight greater than 50,000 g/mol, the fibers having an average diameter of from about 1 Î¼m to about 50 Î¼m, wherein the non-woven has a burst strength greater than 0.1 Kgf, and wherein the non-woven is derived by a melt blown process comprising melt extruding a poly-4-hydroxybutyrate or copolymer polymer at a temperature between 60Â° C. and 275Â° C., conveying the poly-4-hydroxybutyrate or copolymer into a multiple hole spinneret, and attenuating the extruded polymer strands with high velocity air at a temperature of 100-300Â° C.