| abstract |
PCT No. PCT/JP98/01275 Sec. 371 Date Nov. 6, 1998 Sec. 102(e) Date Nov. 6, 1998 PCT Filed Mar. 24, 1998 PCT Pub. No. WO98/42769 PCT Pub. Date Oct. 1, 1998The present invention relates to a polyester polymerization catalyst, comprising a solution containing an aluminum compound and an alkali compound, with water or an organic solvent or a mixture consisting of water and an organic solvent as the medium, a production method thereof, and a polyester production method, in which the product obtained by the esterification reaction or ester interchange reaction between an aromatic dicarboxylic acid or any of its ester forming derivative and a diol is polycondensed, to produce a polyester, comprising the use of said polymerization catalyst containing an aluminum compound. The present invention can provide a polyester excellent in processability and can overcome such problems as spinneret contamination, filtration pressure rise, filament breaking, film breaking and foreign matter production in the production process of products such as fibers, films, resins and bottles. |