| 摘要 |
A concentrate for use in diluted form in an aqueous cleaning composition for cleaning soft metals, which concentrate comprises the following components: (a) a source of calcium ions; (b) 2-phosphonobutane-1,2,4-tricarboxylic acid or a salt thereof (PBTC); and (c) (i) a saturated polymer containing carboxylate groups; (ii) a sulphonate compound of the general formula (I): R - (Ar)n - SO3<-> M<+> in which Ar is phenyl or naphthyl, n=0 or 1, M<+> is H<+> or a suitable counterion, and R is a C8 to C18 straight chain alkyl group and/or (iii) a sulphonate compound of general formula (II), in which Ar' and Ar'' are the same or different and are phenyl or naphthyl, M'<+> and M''<+> are the same or different and are H<+> or a suitable counterion, and R' and R'' are the same or different and are C6 to C16 straight chain or branched chain alkyl. |
