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AssigneeMitsubishi Chemical Corporation
InventorsYoshihiro Fujimori, Toshiyuki Hamano, Hitoshi Matsumoto, Kazuyoshi Mino, Katsuji Tanaka
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Disclosed are a polyester mainly composed of an aromatic dicarboxylic acid as an acid component and an aliphatic diol as a diol component, wherein the content of an antimony element in the polyester is from 50 to 350 ppm, the number of metallic antimony particles having a diameter of 0.5 μm or more is 30,000 or more per 100 mg of polyester, the ratio of the number of fine particles having a diameter of 0.5 μm to less than 0.6 μm is 70% or more, and the L value in hue is 80 or more; a stretch blow molded product formed of the polyester; and a method for producing a polyester mainly composed of an aromatic dicarboxylic acid as an acid component and ethylene glycol as a diol component which comprises adding a preliminary mixed catalyst solution of an antimony compound and a trivalent phosphorus compound as a catalyst, the catalyst solution having a haze of 10% or less, at a stage showing an acid value of 1,000 eq/ton or less before initiation of melt polymerization.
A polyester obtained by polymerizing an acid component and a diol component, wherein the acid component comprises a major amount of an aromatic dicarboxylic acid and the diol component comprises a major amount of ethylene glycol, wherein an antimony element is present in said polyester in a content of from 50 to 350 ppm, the number of metallic antimony particles having a diameter of 0.5 μm or more is 30,000 or more per 100 mg of polyester, the ratio of the number of particles having a diameter of 0.5 μm to less than 0.6 μm is 70% or more, and the Hunter L value is 80 or more.
Dependencies are inferred from the claim text.