Patent ID: 6787493
Filing Date: 2004-09-07
Classification: D04H,Y10T

Abstract:
A thermoformable nonwoven fabric composed of filaments of a biodegradable polymer, whereinthe biodegradable polymer is a copolymer of D-lactic acid and L-lactic acid in which the copolymerization molar ratio of either one of D-lactic acid in which the copolymerization molar ratio of either one of D-lactic acid and L-lactic acid is 90% or more and that of the other is 10% or less, the nonwoven fabric is a spun bonded nonwoven fabric in which the filaments are bonded to each other only in spot fusion-bonded areas partially formed in the nonwoven fabric, the filaments have a polymer supercool index of 0.3 to 0.6, the filaments have a birefringence of 3Ã—10âˆ’3 to 15Ã—10âˆ’3, the filaments have a polymer crystalline size of 15 to 20 angstroms as measured axially thereof, and the nonwoven fabric has a boiling water shrinkage percentage of 10 to 40%.