Process for the preparation of salts of a dicarboxylic acid and a diamine
AssigneeBASF SE
InventorsGeorg Pilz, Gert Buerger, Manfred Barl, Gerhard Thiel
Life of this patent
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Abstract
A process for the preparation of salts of dicarboxylic acids and diamines of the formula H.sub.2 N-(R.sup.1 -O).sub.n -R.sup.2 -NH.sub.2 I where R.sup.1 and R.sup.2 may be identical or different and are each alkylene of 2 to 4 carbon atoms and n is an integer from 1 to 3, which contain hydrazine in the form of hydrazine hydrate.
Claims3
A process for the preparation of a salt of a dicarboxylic acid and a diamine of the formula
- H.sub.2 N--(R.sup.1 --O).sub.n --R.sup.2 --NH.sub.2 I,
- where R.sup.1 and R.sup.2 may be identical or different and are each alkylene of 2 to 4 carbon atoms and n is an integer from 1 to 3, which comprises:
- reacting a dicarboxylic acid and a diamine of the formula I which contains hydrazine in the form of hydrazine hydrate, in an aqueous solution at a temperature of from 50.degree. to 95.degree. C.
The process of claim 4, wherein a diamine of the formula I contains from 5 to 200 ppm of hydrazine in the form of hydrazine hydrate.
The process of claim 4, wherein a diamine of the formula II
- H.sub.2 N--(CH.sub.2).sub.3 --O--(CH.sub.2).sub.2 --O--(CH.sub.2).sub.3 --NH.sub.2 II
- containing from 10 to 150 ppm of hydrazine in the form of hydrazine hydrate is used.
Dependencies are inferred from the claim text.