Patent ID: 7427584

Claim:
A treating composition comprising: a first component selected from the group consisting of an aminopolycarboxylic acid chelating agent selected from the group consisting of ethylenediamine tetraacetic acid (EDTA), hydroxyethylethylenediamine triacetic acid (HEDTA), diethylenetriamine pentaacetic acid (DTPA), hydroxyethyliminodiacetic acid (HEIDA), nitrilotriacetic acid (NTA), and their K, Na, NH 4 or amine salts, and mixtures thereof, wherein said chelating agent is present in an amount of from 20% to 30% by weight of said composition; and mixtures of said aminopolycarboxylic acid chelating agents with an acid selected from the group consisting of hydrochloric, sulfuric, phosphoric, hydrofluoric, formic, acetic, boric, citric, malic, tartaric, and maleic acids and mixtures thereof; and a mutual solvent selected from the group of compounds having a first formula: R 1 —O—CH 2 —CH 2 —O—R 2 wherein in said first formula R 1 and R 2 are the same or different and are hydrogen, methyl, acetate, or ethyl provided that R 1 and R 2 are not both hydrogen and provided that the total number of carbons in both R 1 and R 2 is not more than 2, a second formula: R 1 —O—CH 2 —CH 2 —O—CH 2 —CH 2 —O—R 2 wherein in said second formula R 1 and R 2 are the same or different and are hydrogen, methyl, acetate, acrylate, or ethyl provided that R 1 and R 2 are not both hydrogen, a third formula: R 1 —O—CH 2 —CH(CH 3 )—O—R 2 wherein in said third formula R 1 and R 2 are the same or different and are hydrogen, methyl, acetate, acrylate, ethyl, propyl or butyl provided that if R 1 is acrylate, ethyl, propyl or butyl then R 2 is hydrogen and provided that, if the first component comprises an aminopolycarboxylic acid chelating agent as the only acid, R 1 is hydrogen and R 2 is methyl or acetate, and a fourth formula: R 1 —O—CH 2 —CH(CH 3 )—O—CH 2 —CH(CH 3 )—O—R 2 wherein in said fourth formula R 1 and R 2 are the same or different and are hydrogen, methyl, acetate, acrylate, ethyl, or propyl provided that if R 1 is propyl then R 2 is hydrogen and provided that, if the first component comprises an aminopolycarboxylic acid chelating agent as the only acid, R 1 is hydrogen and R 2 is methyl or acetate; and mixtures thereof.