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AssigneeMitsui Chemicals, Inc.
InventorsHideshi Hori, Fujito Ehara, Akiyoshi Shimizu, Nobumasa Mukai, Shoji Hiraoka
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By the present invention, there are provided a catalyst for polyester preparation, which comprises a solid titanium compound containing titanium, oxygen, carbon and hydrogen and having a Ti—O bond and which has a maximum solubility in ethylene glycol, as measured when the catalyst is dissolved in ethylene glycol under heating at 150° C., of not less than 3,000 ppm in terms of a titanium atom, a catalyst for polyester preparation, which comprises a titanium-containing solution wherein a contact product of a hydrolyzate of a titanium halide or a hydrolyzate of a titanium alkoxide with a polyhydric alcohol is dissolved in ethylene glycol in an amount of 3,000 to 100,000 ppm in terms of a titanium atom, a process for preparing a polyester using the catalyst, and a polyester prepared by the process. According to the present invention, a polyester can be prepared with a higher catalytic activity as compared with a case of using a conventional catalyst, and a polyester having better transparency, better hue and lower acetaldehyde content can be obtained as compared with a process using an antimony compound as a polycondensation catalyst.
A catalyst for polyester preparation, comprising a solid titanium compound which contains titanium, oxygen, carbon and hydrogen and has a Ti—O bond, and having a maximum solubility in ethylene glycol, as measured when the catalyst is dissolved in ethylene glycol under heating at 150° C., of not less than 3,000 ppm in terms of a titanium atom.
A catalyst for polyester preparation, comprising:
A catalyst for polyester preparation, comprising a titanium-containing solution in which a contact product of a hydrolyzate of a titanium halide or a hydrolyzate of a titanium alkoxide with a polyhydric alcohol is dissolved in an ethylene glycol-containing solution in an amount of 3,000 to 100,000 ppm in terms of a titanium atom.
A catalyst for polyester preparation, comprising a titanium-containing solution in which a contact product of a hydrolyzate of a mixture of a titanium halide or a titanium alkoxide and a compound of at least one element selected from the group consisting of beryllium, magnesium, calcium, strontium, barium, scandium, yttrium, lanthanum, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, iron, ruthenium, cobalt, rhodium, nickel, palladium, copper, zinc, boron, aluminum, gallium, silicon, germanium, tin, antimony and phosphorus, with a polyhydric alcohol is dissolved in ethylene glycol in an amount of not less than 3,000 ppm in term of a titanium atom.
A catalyst for polyester preparation, comprising:
A process for preparing a polyester, comprising polycondensing a dicarboxylic acid or its ester-forming derivative and a diol or its ester-forming derivative in the presence of a catalyst for polyester preparation to prepare a polyester, wherein the catalyst is selected from,
Dependencies are inferred from the claim text.