Basf Aktiengesellschaft

Georg Pilz

Rudi-Heinz Rotzoll

Gerhard Thiel

Gert Buerger

Albrecht Eckell

Paul Matthies

Manfred Barl

Ernst Dietl

Hugo Strehler

Paul Duffner

A process for the preparation of salts of dicarboxylic acids and diamines of the formula

Process for the preparation of salts of a dicarboxylic acid and a diamine

Salts of oxaalkylenediamines of the formula I

Salt of oxaalkylenediamine with dicarboxylic acid, containing hydrazine,

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.

Manufacture of nylon by adding liquid diamine to aqueous polyamide

A process for the continuous preparation of an aqueous solution of a salt of an alkanedicarboxylic acid of 6 to 12 carbon atoms and an alkanediamine of 6 to 12 carbon atoms by reacting the particular alkanedicarboxylic acid with the particular alkanediamine in an aqueous solution of the salt to be prepared. The aqueous salt solution is recycled from a first mixing zone via a transport zone and a second mixing zone into the first mixing zone, liquid alkanediamine and an aqueous solution of alkanedicarboxylic acid are introduced between the first and second mixing zones. Less than the equivalent amount of alkanediamine is introduced, the remaining amount of liquid alkanediamine is added after the second mixing zone, and aqueous salt solution is taken off the first mixing zone at the rate at which it is formed. The salt prepared is used for the manufacture of a nylon.

Continuous manufacture of an aqueous solution of a salt of an

A process for the manufacture of a highly concentrated aqueous solution of a salt of a dicarboxylic acid and a diamine, as well as of a nylon precondensate, by reacting 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 ##STR1## An aqueous solution, of lower concentration, of a salt of a dicarboxylic acid and a diamine, containing an appropriate dissolved excess of the particular dicarboxylic acid, is reacted with the particular diamine in the molten state, in an equivalent amount to the dissolved dicarboxylic acid, the reaction being carried out under superatmospheric pressure and the final reaction temperature being kept at from 140.degree. to 210.degree. C. The solution obtained is used for the manufacture of a nylon.

Manufacture of a highly concentrated aqueous solution of a dicarboxylic

Salts of alkanedicarboxylic acids of 4 to 12 carbon atoms and diamines of the formula H.sub.2 N--R--NH.sub.2, where R is alkylene of 2 to 12 carbon atoms or is a radical of the formula ##STR1## which contain hydrazine hydrate, the manufacture of the salts in solution, and their use for the manufacture of nylons.

Growing community of inventors

Neustadt, Germany

Georg Pilz