HEAT-BONDABLE CONJUGATE POLYESTER FIBER HAVING LOW SHRINKAGE

摘要

PROBLEM TO BE SOLVED: To obtain a heat-bondable conjugate polyester fiber having low heat shrinkage and high dimensional stability and giving a fiber structure such as a non-woven fabric resistant to deformation caused by the lowering of the bonding strength even by using the fabric in a hot atmosphere. SOLUTION: This heat-bondable conjugated fiber is composed of a core consisting of a polyalkylene terephthalate having a melting point of >=220 deg.C and a sheath consisting of a copolymerized polyester having a glass transition point of 20-80 deg.C, a crystallization starting temperature of 90-130 deg.C and a melting point of 130-180 deg.C and composed or an aromatic polyester and an aliphatic polylactone. The dry-heat shrinkage of the yarn is <=3% at 100 deg.C.