Stabilisierte Hydroxylaminlösungen

摘要

The present invention relates to stabilised hydroxylamine solutions containing as stabilizer at least one compound of general formula (I) R<1>R<2>N -A-NR<3>R<4> or salts thereof. In said formula (I): A stands for alkylene, alkenylene, alkinylene, cycloalkylene, cycloalkenylene, arylene, o-, m- or p-xylylene, or a five- or six-member saturated or unsaturated heterocycle with a nitrogen atom, the groups in question can have 1, 2 or 3 substituents selected independently of one another from among alkyl, alkoxy or hydroxyl, or stands for the group -X-[-NR-B-]-n- wherein B and X stand for -CH2CH2- or -CH2CH2CH2-, n stands for a number between 10 and 50,000, R stands for H, alkyl, an ethylene or propylene group substituted with OH, NH2, NHCOR<5> or COOH, CSSH, CH2CN or CH2PO3H2 or represents a bridge with a nitrogen atom of another polyethyleneimine or polypropyleneimine chain, said bridge being formed by -[-NR-B-]-o- or CH2 CHOH CH2-[-O CH2 CH2-]-p-CH2 CHOH CH2-, o and p independently of one another standing for 1-15, R<5> stands for H, C1-C18 alkyl or CHR<6>COR<6>, R<6> standing for a C12-C18 alkyl group, R<1>, R<2>, R<3>, R<4> independently of one another stand for H, CH2COOH, CH2PO3H2, alkyl, acyl, CH2CH2OH, CH2CH2NH2 or (a) in which R<7> stands for OH, SH, NH2, CN, COOH, alkyl or alkoxy. Excepted from the disclosure are ethylenediamino-tetraacetic acid and N-hydroxyethylenediamino-triacetic acid and the salts thereof.