Manufacture of nylon by adding liquid diamine to aqueous polyami

Details Manufacture of nylon by adding liquid diamine to aqueous polyami Manufacture of nylon by adding liquid diamine to aqueous polyami

1978-06-08

1981-02-17

Anderson, Harold D.

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

Synthetic resins

From carboxylic acid or derivative thereof

260 292N, 526 65, 526 66, 528346, C08G 6928

Patent

active

042516536

ABSTRACT:
A process for the manufacture of nylons by heating an aqueous solution of a salt of an alkanedicarboxylic acid of 6 to 12 carbon atoms and a diamine of the formula NH.sub.2 RNH.sub.2, where R is alkylene of 6 to 12 carbon atoms or is a radical ##STR1## to a temperature at which a nylon is formed, under superatmospheric pressure and with removal of water. The solution used is an aqueous solution of from 75 to 90 percent strength by weight of a salt of a dicarboxylic acid and a diamine, which solution has been obtained by neutralizing a less concentrated salt solution, which contains an appropriate dissolved excess of the particular dicarboxylic acid, with the corresponding diamine. The nylons obtained are used for the manufacture of moldings.

REFERENCES:
patent: 2923699 (1960-02-01), Indest et al.
patent: 3185672 (1965-05-01), Clemo et al.
patent: 3952051 (1976-04-01), Ogawa et al.
patent: 4131712 (1978-12-01), Sprauer

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