Patent ID: 8685912

Claim:
A detergent composition for metal comprising a component (A), a component (B), a component (C) and a component (D) as described below, and having a pH of at least 9 that is measured at 25Â° C. when the detergent composition is diluted to 1% by mass of an aqueous solution; a component (A): a polyoxyalkylene alkyl ether (A1) represented by general formula (I); [Chemical Formula 1] R 1 O(EO) n1 (PO) m1 Hâ€ƒâ€ƒ(I) wherein R 1 represents an alkyl group of 8 to 11 of carbon atoms or an alkenyl group of 8 to 11 of carbon atoms; EO represents an ethyleneoxy group; PO represents a propyleneoxy group; n1 represents an average addition mole number of EO and is an integer of 1 to 10; m1 represents an average addition mole number of PO and is an integer of 0 to 5; a component (B): a nitrogen-containing organic compound of at least one selected from the group consisting of an amine compound (B1) represented by general formula (III), an allylamine-based polymer (B6) having a weight-average molecular weight of 5,000 to 50,000 and a polyethylene imine (B5) having a weight-average molecular weight of 5,000 to 50,000 and having a structural unit represented by general formula (IV); [Chemical Formula 3] R 2 â€”Zâ€”(CH 2 ) 3 â€”NH 2 (III) wherein R 2 represents an alkyl group of 7 to 14 carbon atoms or an alkenyl group of 7 to 14 carbon atoms; and Z represents â€”Oâ€” or â€”NHâ€” [Chemical Formula 4] â€”(CH 2 CH 2 NH)â€”â€ƒâ€ƒ(IV); a component (C): a carboxylic acid or a salt thereof selected from the group consisting of an aliphatic carboxylic acid of 4 to 12 carbon atoms or a salt thereof (C1) and an aromatic carboxylic acid of 7 to 12 carbon atoms or a salt thereof (C2); and a component (D): an amine compound (D2) having a branched alkanol group, represented by general formula (VI) wherein R 3 , R 4 , and R 5 each independently represent a hydrogen atom or a branched alkanol group of 3 to 6 carbon atoms; provided that all of R 3 , R 4 and R 5 are not a hydrogen atom at the same time.