EP 0997523 B1 20021204 - Aqueous solutions of phosphonic acids
Title (en)
Aqueous solutions of phosphonic acids
Title (de)
Wässrige Lösungen von Phosphonsäuren
Title (fr)
Solutions aqueuses d'acides phosphoniques
Publication
Application
Priority
DE 19849379 A 19981027
Abstract (en)
[origin: EP0997523A1] 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.
IPC 1-7
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)
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