Process for the production of polyamides on the basis of .alpha.

Details Process for the production of polyamides on the basis of .alpha. Process for the production of polyamides on the basis of .alpha.

1996-02-12

1997-05-06

Seidleck, James J.

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

Synthetic resins

From carboxylic acid or derivative thereof

528313, 528319, 528324, 528331, 528336, 528339, C08G 6928

Patent

active

056272570

ABSTRACT:
Process for synthesis of spinnable polyamide from .alpha., .omega.-alkyldinitriles and .alpha., .omega.-alkyldiamines and excess water, where a) the aqueous solution of the dinitrile is mixed with a catalytic amount of at least one oxygen-containing acid of phosphorus and/or a water-soluble salt of calcium, zinc, cadmium or manganese in the absence of the diamine, and the pH of this solution is adjusted to an initial value in the range of 2.0 to 4.0 before hydrolysis by adding a saturated aliphatic or aromatic dicarboxylic acid and the dinitrile is and the amide-containing precursors derived therefrom are hydrolyzed to dicarboxylic acid at an elevated temperature under autogenous pressure, whereby the hydrolysis is controlled by conductometric determination of the hydrolysate, and b) at least an equimolar amount of diamine is added to the solution from step a) and the mixture is subjected to polycondensation to form polyamide [nylon].

REFERENCES:
patent: 4725666 (1988-02-01), Curatolo et al.
patent: 4739035 (1988-04-01), Shyu et al.
patent: 5306804 (1994-04-01), Liehr et al.

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