Method and apparatus for the production of polyamides

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof

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528315, 528318, 528323, 528324, 5283291, 528332, 528480, 528488, 528499, C08G 6908, C08G 7310

Patent

active

057735557

ABSTRACT:
There are proposed a method and a device for manufacturing polyamides, in which polyamide granulate manufactured by polycondensation in the molten mass is after-condensed in the solid phase, being heated. The polyamide granulate is heated in one step to a first temperature of between 70.degree. C. and 150.degree. C., and held for a predetermined period of time at this temperature, and then, in a second step, is heated to a second higher temperature, however lying beneath the melting point, and is after-condensed at this temperature, until the desired average degree of polycondensation is achieved.

REFERENCES:
patent: 3031433 (1962-04-01), Monroe
patent: 3155637 (1964-11-01), Reichold et al.
patent: 3307271 (1967-03-01), Simpson
patent: 3480596 (1969-11-01), Simons
patent: 3634357 (1972-01-01), Stewart et al.
patent: 3821171 (1974-06-01), Beaton
patent: 4755590 (1988-07-01), Kubanek et al.

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