abstract |
The present invention, in the composite fiber, the esterification and polycondensation by mixing an acid component, a sulfonic acid metal salt and a diol component having 2 to 14 carbon atoms comprising an aliphatic acid containing a carboxylic acid group and an aromatic acid containing a phenylene group As the polyester to be produced, the core portion (dodo component, N component) is mixed with 9-20 mol% aliphatic acid, 79-90 mol% aromatic acid and 0.5-1.5 mol% sulfonic acid metal salt, and includes an acid component and sulfonic acid metal salt. 1 to 5 parts by weight of the polyethylene oxide grafted with glycidyl methacrylate or maleic hydride is mixed with 100 parts by weight of the polyester resin in a ratio of 1.0: 1.0 to 1.4 by weight. The sheath portion (sea component, P component) provides a polyester composite fiber having improved degradability composed of polylactic acid (PLA). |