Title (en)

Aqueous solutions of phosphonic acids

Title (de)

Wässrige Lösungen von Phosphonsäuren

Title (fr)

Solutions aqueuses d'acides phosphoniques

Publication

EP 0997523 A1 20000503 (DE)

Application

EP 99121341 A 19991026

Priority

DE 19849379 A 19981027

Abstract (en)

Aqueous solutions containing salts of amino-(methylene phosphonic acids) with at least 6 phosphonic acid groups, or mixtures of the corresponding free acids. Aqueous solutions containing salts of phosphonic acids of formula (I): n = 3, 4 and/or 5 with an active substance content (based on free phosphonic acid) of at least 25 wt. % , obtained by partial neutralization of at least one phosphonic acid group per molecule. An Independent claim is also included for aqueous solutions containing mixtures of free phosphonic acids of formula (I) or a similar formula (II) with the index n replaced by n'. n and n' = 1, 2, 3, 4 and/or 5 with an active substance content as above, comprising at least two acids of formula (II) with n not equal to n' and with an active substance content of at least 25 wt. % based on complex former content.

Abstract (de)

Gegenstand der Erfindung sind wäßrige Lösungen von Phosphonsäuren und/oder deren Salzen sowie insbesondere deren Verwendung als Komplexbildner zur Behandlung von cellulosehaltigen Fasermaterialien, die in Entmineralisierungsprozessen und zur Stabilisierung von peroxidhaltigen Bleichlösungen eingesetzt werden können.

IPC 1-7

C11D 3/36; D06L 3/02; C11D 3/39

IPC 8 full level

C11D 3/36 (2006.01); C11D 3/39 (2006.01); D06L 3/02 (2006.01); D06L 4/10 (2017.01)

CPC (source: EP)

C11D 3/364 (2013.01); D06L 4/10 (2017.01)

Citation (search report)

• [DA] EP 0125766 A1 19841121 - ALBRIGHT & WILSON [GB]
• [DA] DE 19528843 A1 19970206 - CHT R BEITLICH GMBH [DE]
• [A] EP 0369711 A2 19900523 - ALBRIGHT & WILSON [GB]
• [A] EP 0009839 A1 19800416 - UNILEVER NV [NL], et al
• [A] EP 0700874 A1 19960313 - MONSANTO EUROPE SA [BE]
• [A] WO 9602624 A1 19960201 - SO SAFE SPECIALTY PRODUCTS PTY [AU], et al

Designated contracting state (EPC)

AT DE ES FI SE

DOCDB simple family (publication)

EP 0997523 A1 20000503; EP 0997523 B1 20021204; AT E229065 T1 20021215; DE 19849379 A1 20000504; DE 59903638 D1 20030116; ES 2188086 T3 20030616

DOCDB simple family (application)

EP 99121341 A 19991026; AT 99121341 T 19991026; DE 19849379 A 19981027; DE 59903638 T 19991026; ES 99121341 T 19991026