Preparation of polyesters from terephthalic acid

Details Preparation of polyesters from terephthalic acid Preparation of polyesters from terephthalic acid

1987-05-06

1988-10-25

Welsh, Maurice J.

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

Synthetic resins

From carboxylic acid or derivative thereof

528283, C08G 6304

Patent

active

047805277

ABSTRACT:
Poly(butylene terephthalate) is prepared in a two-stage process wherein terephthalic acid and 1,4-butanediol are esterified in the presence of a catalytic amount of a catalyst having an organo-metallic component which is an organo-titanate compound, an organo-tin compound or a combination thereof and a salt component which is an organic acid salt or an inorganic salt. In a second step, the esterification product is subject to polycondensation. By following the foregoing procedure, the formation of tetrahydrofuran is significantly suppressed and the percent conversion of esterification products increased.

REFERENCES:
patent: 4511708 (1985-04-01), Kasuga et al.
patent: 4611049 (1986-09-01), Kuratsuji et al.
patent: 4656241 (1987-04-01), Iida et al.
patent: 4680376 (1987-07-01), Heinze et al.

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