C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/203
C08G 63/22 (1980.01)
Patent
CA 1103842
PROCESS FOR REDUCING THE PROCESSING TIME IN THE PRODUCTION OF POLYESTERS 75T32 Abstract of the Invention Polyesters obtained by reacting isophthalic acid or terephthalic acid with a polyol with or without a catalyst in a first stage to form a half-ester mixture which is reacted in a second stage with an aliphatic polycarboxylic acid are produced at reduced processing times. In the first stage a portion of the total polyol to be reacted is contacted with substantially all of the isophthalic acid or terephthalic acid. Then, this mixture is heated to a temperature of at least 190°C. and the remaining portion of the polyol is added to the heated mixture in such a manner that the temperature remains at or above the 190°C. This temperature is maintained until the reaction to form a half-ester mixture is completed. This reaction may be conducted in the presence of an esterifica- tion catalyst, The polyester-monomer mixture is reacted in a second stage with an aliphatic polycarboxylic acid to produce the polyester.
277697
Borden Ladner Gervais Llp
Koppers Company Inc.
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