Abstract: An aqueous cleaning composition for a substrate for a perpendicular magnetic recording hard disk including a Ni—P containing layer contains at least one surfactant selected from the group consisting of surfactants represented by Formulas (1) to (6) and has a pH at 25° C. of 5 or less. In Formula (1), R1 is an alkyl group having a carbon number of 10 to 16, and X is a halogen atom.

Abstract: An alkali-type nonionic surfactant composition contains a nonionic surfactant (component A), water (component B), at least one compound (component C) selected from the group consisting of benzenesulfonic acid, toluenesulfonic acid, dimethylbenzenesulfonic acid, hydroxybenzenesulfonic acid and salts thereof, and at least one alkaline chemical (component D) selected from the group consisting of potassium hydroxide and sodium hydroxide. The alkali-type nonionic surfactant composition contains the nonionic surfactant (component A) in an amount of 0.5 to 20 wt % and has a pH at 25° C. of 12 or greater.

Abstract: The present invention relates to a cleaning agent composition for use in cleaning a substrate for recording media, a substrate for photomask, or a substrate for flat panel display, a surface of which at least contains a metallic or glassy substrate moiety, the cleaning agent composition containing (I) a copolymer compound satisfying at least the following (i) to (iii): (i) a constituting unit A1 derived from acrylic acid is contained in an amount of 20% by mol or more of the entire constituting units; (ii) the constituting unit A1 derived from acrylic acid and a constituting A2 derived from 2-acrylamide-2-methylpropanesulfonic acid are contained in a total amount of 90% by mol or more of the entire constituting units; and (iii) the constituting unit A1 and the constituting unit A2 of the entire constituting units are in a content ratio [constituting unit A1 (% by mol)/constituting unit A2 (% by mol)] of from 91/9 to 95/5.

Abstract: An alkali-type nonionic surfactant composition contains a nonionic surfactant (component A), water (component B), at least one compound (component C) selected from the group consisting of benzenesulfonic acid, toluenesulfonic acid, dimethylbenzenesulfonic acid, hydroxybenzenesulfonic acid and salts thereof, and at least one alkaline chemical (component D) selected from the group consisting of potassium hydroxide and sodium hydroxide. The alkali-type nonionic surfactant composition contains the nonionic surfactant (component A) in an amount of 0.5 to 20 wt % and has a pH at 25° C. of 12 or greater.

Abstract: An aqueous cleaning composition for a substrate for a perpendicular magnetic recording hard disk including a Ni—P containing layer contains at least one surfactant selected from the group consisting of surfactants represented by Formulas (1) to (6) and has a pH at 25° C. of 5 or less. In Formula (1), R1 is an alkyl group having a carbon number of 10 to 16, and X is a halogen atom.

Abstract: The present invention relates to a cleaning agent composition for use in cleaning a substrate for recording media, a substrate for photomask, or a substrate for flat panel display, a surface of which at least contains a metallic or glassy substrate moiety, the cleaning agent composition containing (I) a copolymer compound satisfying at least the following (i) to (iii): (i) a constituting unit A1 derived from acrylic acid is contained in an amount of 20% by mol or more of the entire constituting units; (ii) the constituting unit A1 derived from acrylic acid and a constituting A2 derived from 2-acrylamide-2-methylpropanesulfonic acid are contained in a total amount of 90% by mol or more of the entire constituting units; and (iii) the constituting unit A1 and the constituting unit A2 of the entire constituting units are in a content ratio [constituting unit A1 (% by mol)/constituting unit A2 (% by mol)] of from 91/9 to 95/5.

Abstract: The present invention relates to a detergent composition containing (a) 2 to 30% by weight of an inorganic alkali, (b) 0.5 to 20% by weight of at least one surfactant selected from an anionic surfactant and a nonionic surfactant, (c) 0.01 to 2% by weight (based on calcium ion) of a calcium salt, (d) 0.1 to 15% by weight of a calcium ion-sequestering agent, (e) 1 to 30% by weight of a water-soluble organic solvent and (f) 20 to 95% by weight of water.

Abstract: The present invention relates to a detergent composition containing (a) 2 to 30% by weight of an inorganic alkali, (b) 0.5 to 20% by weight of at least one surfactant selected from an anionic surfactant and a nonionic surfactant, (c) 0.01 to 2% by weight (based on calcium ion) of a calcium salt, (d) 0.1 to 15% by weight of a calcium ion-sequestering agent, (e) 1 to 30% by weight of a water-soluble organic solvent and (f) 20 to 95% by weight of water.