PURPOSE: To provide a biodegradable sheath-core conjugate monofilament having a certain heat-resistance satisfiable as a fishery material, agricultural material- and general industrial material and completely decomposable by microorganisms after use. ;CONSTITUTION: This biodegradable sheath-core conjugate monofilament is produced by using a polybutylene succinate as the core part and a copolymer of polybutylene succinate and polyethylene succinate at a molar ratio of 100/0 to 65/35 or 20/80 to 0/100 and having a melting point lower than that of the core polymer as the sheath part, melt-spinning the polymers through a spinneret having a circular sheath-core conjugate spinning nozzle, cooling the spun filament in a cooling water bath having a temperature lower than the crystallization temperature of the sheath polymer by 10-40°C, subjecting the cooled filament immediately to multistage drawing in a hot water bath at a 1st-stage draw ratio of ≥5 and 7 and a total draw ratio of ≥7 and carrying out the relaxed heat-treatment of the drawn filament in an oven.;COPYRIGHT: (C)1995,JPO
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