Polyester polymerization catalyst, polyester produced therewith and process for producing the polyester
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United States of America Patent
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Issued Date -
May 10, 2007
app pub date -
Feb 8, 2005
filing date -
Feb 10, 2004
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Abandoned
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Abstract
The invention provides a polyester produced in the presence of a polycondensation catalyst comprising at least one compound selected from a group consisting of aluminum compounds and at least one compound selected from a group consisting of phosphorus compounds and being excellent in color tone, thermal stability, and transparency and improved in terms of insoluble particles. Particularly, the invention provides a polyester in which the content of an aluminum containing insoluble particles in the polyester is 3500 ppm or lower and a polyester which has a haze value of 2% or lower when being formed into a monoaxially oriented film. The aluminum catalyst for attaining these characteristics and properties may be polyester polymerization catalyst obtained by mixing an aluminum compound and a phosphorus compound in a solvent and has specified spectral characteristics in the side measurement of .sup.31P-NMR spectrum and .sup.27Al-NMR spectrum.
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