Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1976-08-24
1978-07-18
Danison, Walter C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
C08G 6322, C08G 6368
Patent
active
041015240
ABSTRACT:
The production of polyester amides based on dicarboxylic acids and/or the esters thereof, primary diamines, and polyhydric alcohols and/or aminocarboxylic acids or lactams, by poly-condensing the mixture under heating in the presence of water, while distilling off the volatile components, and recondensation under reduced pressure is improved so that colorless polyester amides are produced. In a first stage a monomer mixture is preliminarily condensed in the presence of about 3 - 20 percent of water, based on the sum total of the polyamide-forming components, under a pressure of about 14 - 25 bars, at temperatures of about 200.degree. - 300.degree. C and for a time period of about 4 - 12 hours. In a second stage, the mixture is completely condensed, after removal of the water, under a reduced pressure of about 0.01 - 100 mbar at temperatures of about 230.degree. - 300.degree. C and for a period of time of about 1 - 12 hours.
REFERENCES:
patent: 3185668 (1965-05-01), Meyer et al.
patent: 3440218 (1969-04-01), Caldwell
patent: 3546178 (1970-12-01), Caldwell et al.
patent: 3828010 (1974-08-01), Davis et al.
patent: 3836574 (1974-09-01), Achsel et al.
Yen, "Polyamides Other than Nylons 6 and 66", Process Economics Program, Stanford Research Institute, Menlo Park, Ca., Nov. 1974.
Burzin Klaus
Feldmann Rainer
Chemische Werke Huls Aktiengesellschaft
Danison Walter C.
Wells Gilbert L.
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