Patent ID: 7399367

Claim:
A rust-preventive water-oil separating cleaner composition for contacting a part to be cleaned to which at least one oil selected from the group consisting of grease-based oil, naphthene-based mineral oil, paraffin-based mineral oil, poly-α-olefin, polyol ester, and polydimethyl siloxane attaches, the composition separating the oil from the part, while providing the part with a rust-preventive property, thus forming an oil layer containing the oil, the composition comprising: (X) an ethylene oxide additive of monoalkyl amine represented by formula (1), and (Y) at least one compound selected from the group consisting of; an N-monoalkyl-N-(2-hydroxyalkyl)-iminoethylene carboxylate having a hydrocarbon group with a number of carbon atoms from 8 to 22; an acylated amino acid salt having a hydrocarbon group with a number of carbon atoms from 8 to 22; an alkyloyl sarcosinate having a hydrocarbon group with a number of carbon atoms from 8 to 22, and a tall oil fatty acid salt, wherein R designates an alkyl group having a straight chain or a side chain with a number of carbon atoms from 7 to 9, m designates an integer from 0 to 2, n designates an integer from 0 to 2, and (m+n) designates an integer from 1 to 3.