| 摘要 |
The present invention relates to an aqueous resin composition of phenolformaldehyde condensate, at least one alkali and/or alkaline earth hydroxide as well as at least one organic acid, selected from the group consisting of: C2 to C8- hydroxycarboxylic acids, in particular glycolic acid, citric acid, tartaric acid; aryl carboxylic acids with one or two six-membered rings; hydroxy aryl carboxylic acids with one or two six-membered rings with 1 to 3 OH groups, in particular salicylic acid; polymer carboxylic acids, in particular polyacrylic acids, preferably polyacrylic acids having a molecular weight of 500 to 100.000 D; maleic acid-acrylic acid-copolymers, amino carboxylic acids, in particular ethylenediaminetetraacetic acid (EDTA), ethylene glycol bis(2-aminoethylether)-N,N,N',N'-tetraacetic acid (EGTA). |
