Process for the acceleration of the polycondensation of polyeste

Details Process for the acceleration of the polycondensation of polyeste Process for the acceleration of the polycondensation of polyeste

1997-02-06

1998-04-28

Acquah, Samuel A.

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

Synthetic resins

From carboxylic acid or derivative thereof

528287, 528298, 528302, 528307, 528308, 5283086, 528481, 528503, 428 357, C08G 6378

Patent

active

057445729

ABSTRACT:
A process for the acceleration of the polycondensation of polyester made by the esterification of at least one dicarboxylic acid with at least one diol, precondensation, melt phase polycondensation, granulation, crystallization and solid phase polycondensation comprising the addition, prior to the precondensation reaction, of from about 30 to about 900 ppm phosphorus in relation to the polyester in the form of carboxy phosphonic acid of the formula: ##STR1## wherein, R is selected from the group consisting of C.sub.1-10 -alkylene, C.sub.1-10 -cycloalkylene, and C.sub.6-10 -arylene and R.sup.1, R.sup.2, and R.sup.3 are selected from the group consisting of hydrogen, C.sub.1-10 -alkyl, C.sub.1-10 -cycloalkyl, and C.sub.6-10 -aryl, provided that at least two of R.sup.1, R.sup.2, and R.sup.3 are hydrogen.

REFERENCES:
patent: 3169944 (1965-02-01), Scott et al.
patent: 4086208 (1978-04-01), Murayama et al.

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