Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1979-09-10
1981-01-13
Phynes, Lucille M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528272, 528303, 528304, C08G 6316
Patent
active
RE0304816
ABSTRACT:
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 with agitation to a temperature of at least 190.degree. C. and the remaining portion of the polyol is added to the heated mixture with agitation in such a manner that the temperature remains at or above the 190.degree. 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 esterification catalyst. The polyester-monomer mixture is reacted in a second stage with an aliphatic polycarboxylic acid to produce the polyester.
REFERENCES:
patent: 2904533 (1959-09-01), Carlston et al.
patent: 3196131 (1965-07-01), Mayer et al.
patent: 3252941 (1966-05-01), Mayer et al.
patent: 3345339 (1967-10-01), Parker et al.
patent: 4046739 (1977-09-01), Lacona
Brumback Oscar B.
Koppers Company Inc.
MacKay Donald M.
Phynes Lucille M.
Zeh, Jr. Herbert J.
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