POLYESTER EXCELLENT IN MOLDABILITY AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To provide a polyester excellent in moldability and solving problems such as the staining of spinnerets, the rise of filtration pressures and the breakage of fibers on the production of molded products such as fibers, films and bottles, and to provide a method for producing the same. ;SOLUTION: This polyester contains an organic aluminum compound of the formula: Al[OR₁]_l[OR₂]_m[OR₃]_n[R₄]_o [R₁, R₂, R₃ are each an alkyl, an aryl, an acyl; R₄ is an alkylacetoacetate ion, acetylacetone ion; wherein R₁, R₂, R₃ are each simultaneously not H or acetyl; (l), (m), (n) and (o) are each 0 or a positive number wherein (l)+(m)+(n)+(o)=3] in an amount of 5-500 ppm (converted into aluminum atom) based on the polymer, and a cobalt compound in an aluminum atom/cobalt atom (Al/Co) molar ratio of 0.5-20.;COPYRIGHT: (C)1998,JPO