POLYESTER RESIN AND METHOD FOR PRODUCING POLYESTER RESIN
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United States of America Patent
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Issued Date -
Jan 5, 2023
app pub date -
Dec 14, 2020
filing date -
Dec 14, 2020
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Abstract
The present invention is to provide a high-quality polyester resin that is produced by using a polymerization catalyst containing an aluminum compound and a phosphorus compound, that can reduce a catalyst cost, for which polymerization activity is high, and in which there is less foreign matter. The polyester resin contains an aluminum compound and a phosphorus compound used as a catalyst, and the amount of aluminum atom contained in the polyester resin is 9 to 20 ppm, the amount of phosphorus atom contained in the polyester resin is 13 to 31 ppm, a mole ratio of the phosphorus atom to the aluminum atom in the polyester resin is 1.32 to 1.80.
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