Process for production of polypropylene terephthalate

Details Process for production of polypropylene terephthalate Process for production of polypropylene terephthalate

1997-10-01

1998-08-25

Acquah, Samuel A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528280, 528285, 528286, 528302, 5283086, 528503, 524779, 524783, 524785, 524789, C08G 6382

Patent

active

057984336

ABSTRACT:
The present invention provides a method of synthesizing polypropylene terephthalate with no more than 5 ppm acrolein and no more than 3 ppm allyl alcohol. The method comprises direct esterification of terephthalic acid with 1,3-propanediol in the presence of 30 to 200 ppm titanium in the form of an inorganic esterification catalyst containing at least 50 mol % TiO.sub.2 precipitate, blocking the esterification catalyst after esterification by adding 10 to 100 ppm phosphorus in the form of a phosphorus-oxygen compound, and then performing precondensation and polycondensation in the presence of 100 to 300 ppm antimony in the form of a conventional antimony polycondensation catalyst and optional conventional coloring agent.

REFERENCES:
patent: 3696171 (1972-10-01), Braunstein
patent: 4611049 (1986-09-01), Kuratsuji et al.
patent: 4713414 (1987-12-01), Kusumgar
patent: 5340909 (1994-08-01), Doerr et al.
patent: 5459229 (1995-10-01), Kelsey et al.

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