Process for the preparation of a polyester using an antimony-est

Details Process for the preparation of a polyester using an antimony-est Process for the preparation of a polyester using an antimony-est

1994-12-15

1995-12-26

Seidleck, James J.

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

Synthetic resins

From carboxylic acid or derivative thereof

502150, 502157, 528272, 528275, C08G 6378

Patent

active

054789117

ABSTRACT:
A linear, highly polymerized polyester is prepared by polycondensing a glycol ester of aromatic dicarboxylic acid and/or a low molecular weight condensate thereof by using as polycondensation catalyst a preformed antimony compound which is obtained from the reaction of esterified trimellitate with an antimony compound selected from a member of antimony halide, antimony carbyxylate and antimony carbyxylate. The above-mentioned esterified trimellitate is prepared by reacting trimellitic acid or trimellitic anhydride with alcohols such as alkyl alcohol or alkane diol and treating successively organic or inorganic base with the resultant reaction product, and comprises, depending on the type of alcohol used, a mixture of 1-alkoxycarbonyl-2,4-benzenedicarboxylate and 2-alkoxycarbonyl-1,4-benzenedicarboxylate or a mixture of 1-(hydroxyalkoxycarbonyl)-2,4-benzenedicarboxylate and as a main 2-(hydroxyalkoxycarbonyl)-1,4-benzenedicarboxylate component. A high quality polyester having a low content of terminal carboxyl group and diethylene glycol group, an excellent color tone and a high melting point may be prepared by using preformed antimony compound in a short polycondensation time.

REFERENCES:
patent: 4975513 (1990-12-01), Kim et al.

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