Process for producing polybutylene terephthalate

Details Process for producing polybutylene terephthalate Process for producing polybutylene terephthalate

2005-04-28

2009-06-23

Gulakowski, Randy (Department: 1796)

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

Synthetic resins

From carboxylic acid or derivative thereof

Reexamination Certificate

active

07550552

ABSTRACT:
Polybutylene terephthalate is produced by continuously subjecting terephthalic acid and 1,4-butanediol to an esterification reaction in the presence of a titanium compound catalyst using one-stage or plural-stage esterification reaction vessel(s) and then subjecting the resultant reaction product to a polycondensation reaction, wherein the esterification reaction between terephthalic acid and 1,4-butanediol is conducted in the presence of a titanium compound having a specific concentration under a specific pressure at a specific molar ratio between the raw materials. The process avoids undesirable side reactions by continuously conducting esterification reaction using terephthalic acid as a raw material, and can minimize loss of raw materials.

REFERENCES:
patent: 3801547 (1974-04-01), Hoeschele
patent: 4329444 (1982-05-01), Borman
patent: 4499261 (1985-02-01), Heinze et al.
patent: 4656241 (1987-04-01), Iida et al.
patent: 2003-73466 (2003-03-01), None
patent: 2004-68001 (2004-03-01), None
International Search Report of PCT/JP2005/008209, mailed Jun. 7, 2005.

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