Method and apparatus for the production of polyamides

Details Method and apparatus for the production of polyamides Method and apparatus for the production of polyamides

1996-03-13

1998-06-30

Hampton-Hightower, P.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

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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