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AssigneeEquipolymers GmbH
InventorsJens-Peter WIEGNER, Olaf HEMPEL, Matthias STOLP, Roland ABEL
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The invention relates to a method for producing a polyester in a polycondensation reaction catalyzed by an aluminum titanate compound, a barium titanate compound, a calcium titanate compound, zinc titanate compound, or a mixture of these titanate compounds. The invention also relates to a composition comprising the aluminum titanate compound, the barium titanate compound, the calcium titanate compound, zinc titanate compound, or a mixture of these titanate compounds as a catalyst for producing a polyester in a polycondensation reaction. Further, the invention relates to the use of the aluminum titanate compound, the barium titanate compound, the calcium titanate compound, the zinc titanate compound, or a mixture of these titanate compounds as a heterogeneous polycondensation catalyst. The aluminum titanate compound, the barium titanate compound, the calcium titanate compound, the zinc titanate compound, or a mixture of these titanate compounds is a non-amorphous mixed oxide of aluminum oxide (and/or barium oxide, and/or calcium oxide, and/or zinc oxide) with titanium oxide. These titanate compounds were found to be excellent heterogeneous catalysts in polycondensation reactions for producing polyesters, such as polyethylene terephthalate.
A composition for a polyester polycondensation reaction, comprising:
A method for producing a polyester, thereby using one or more catalysts, the method comprising the steps of:
A titanate compound in a crystalline form and configured as a heterogeneous catalyst in a polyester polycondensation reaction, wherein the titanate compound is selected from the group consisting of an aluminum titanate compound, a barium titanate compound, a calcium titanate compound, a zinc titanate compound or wherein the titanate compound is a mixture of two, three or four of said titanate compounds.
Dependencies are inferred from the claim text.