Method for the preparation of polyester by use of composite cata

Details Method for the preparation of polyester by use of composite cata Method for the preparation of polyester by use of composite cata

1996-07-16

1998-02-03

Acquah, Samuel A.

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

Synthetic resins

From carboxylic acid or derivative thereof

528279, 528281, 528283, 528285, 528286, 528287, 5282953, 528296, 528308, 5283086, 525437, 524 81, 524706, 524710, 524713, 524779, 502102, 502103, C08G 6378, C08F 460

Patent

active

057145709

ABSTRACT:
A method for preparing polyester by use of a catalyst. The method comprises the steps of: esterifying either a terephthalic acid, a dicarboxylic acid containing terephthalic acid or derivatives thereof with either ethylene glycol or a glycol containing ethylene glycol, or derivatives thereof to produce an esterification product containing either bis(.beta.-hydroxyethyl) terephthalate, its low molecular weight polymer, or a combination of .beta.-hydroxyethyl terephthalate and its low molecular weight polymer; and continuously polycondensing the obtained esterification product to prepare a polyester, wherein in the said polycondensing step, a composite polymerization catalyst dissolved in an ethylene glycol or an ethylene glycol-containing solution, consisting of a compound of antimony, a compound of titanium, and a compound of tin is used. The method can considerably reduce both the esterification time and the polycondensation time and provides a good color, reduced content of diethylene glycol and reduced concentration of terminal carboxyl groups in the prepared polyesters.

REFERENCES:
patent: 5286836 (1994-02-01), Park et al.
Grant et al. "Chemical Dictionary", 5th Ed., pp. 219,587.
Morrison et al. "Organic Chemistry", 5th Ed., p. 699.

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