| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a new polycondensation catalyst which has excellent catalytic activity while containing no antimony as a component, and gives a high-molecular weight polyester having an excellent color tone and transparency; and to provide a method for producing the polyester with use of the catalyst. <P>SOLUTION: The catalyst is used for producing the polyester by esterification or transesterification of a dicarboxylic acid or an ester-forming derivative thereof, with a glycol. The catalyst consists of a solid base particle comprising an inner coating layer composed of an oxide of at least one element selected from silicon, aluminum and zirconium, or a composite oxide of at least two elements selected from silicon, aluminum and zirconium in an amount of 1-20 pts.wt., and an outer coating layer composed of titanic acid in an amount of 0.1-50 pts.wt. in terms of TiO<SB>2</SB>on the surface of the particle, based on 100 pts.wt. of the solid base. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
