| 摘要 |
PROBLEM TO BE SOLVED: To obtain a core-sheath type conjugate fiber having a high specific gravity and a high strength, excellent in biodegradability and useful for fishing nets, curtains, etc., by including a prescribed amount of inorganic particles in a core part in a ratio of the core part within a prescribed range and providing the fiber with a prescribed fiber strength and a prescribed fiber specific gravity. SOLUTION: This conjugate fiber is a core-sheath type conjugate fiber comprising both a core part and a sheath part composed of a biodegradable polymer which is an aliphatic polyester such as poly-L-lactic acid. Inorganic particles which are metal compound particles having >=3 specific gravity such as barium sulfate in an amount of 12-80 wt.% are contained in the core part and the core part accounts for 9-60 wt.% of the conjugate fiber. The fiber strength is >=3.1 cN/dtex and the fiber specific gravity is >=1.45. The core-sheath type conjugate fiber preferably has >=7.65 dtex single fiber fineness.
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