Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1980-08-25
1982-08-17
Morris, Theodore
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
525296, 525419, 528292, 528318, C08G 6944, C08G 6342
Patent
active
043450644
ABSTRACT:
A process for preparing polyether amides of polyether ester amides by polycondensing polyamides bearing carboxyl end groups with polyethers bearing hydroxyl end groups and/or amino end groups at ordinary or reduced pressure, in the presence of catalysts, the polyamides bearing the end groups and the polyethers bearing the end groups first being treated at temperatures from about 200.degree. to 300.degree. C. at a water vapor pressure of 5 to 25 bars and with mechanical agitation, and wherein upon removing the water by expansion, the polycondensation is carried to completion. The present invention differs from the prior art in that the polyamides bearing carboxyl groups being used are prepared by melting a mixture of lactams having at least 8 C atoms with dicarboxylic acids in the molar ratio of 100/1 to 100/15 in the presence of a catalyst, in an inert gas atmosphere, at atmospheric pressure and in the absence of water at temperatures from 230.degree. to 300.degree. C., heating in the molten form lasting until the lactams have been reacted at least 98% to form a prepolymer. Water and the polyethers are then added to the prepolymer, the autoclave is closed, and the process continued.
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Chemische Werke Huls AG
Morris Theodore
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