Aqueous solution composition of strong alkali and nonionic surface active agent

Claim 1

An aqueous solution composition of a strong alkali and a nonionic surface active agent comprising: (a) a strong alkali, (b) a nonionic surface active agent having an HLB value of 3-18, and, as a solubilizing agent, (c) a carboxylic acid represented by the following formula (I): R.sub.1 COOM.sub.1 (I) in which R 1 represents a C 4-18 linear aliphatic hydrocarbon group, C 4-18 branched aliphatic hydrocarbon group, or C 6-18 aromatic hydrocarbon group, and M 1 represents a hydrogen atom, an alkali metal, an aliphatic amine having a C 1-4 carbon atom content, ammonia, or an alkanolamine, and a carboxylic acid of the following formula (II), in combination: R.sub.2 --X--(CH.sub.2).sub.m1 COOM.sub.2 (II) in which R 2 represents a C 4-18 linear aliphatic hydrocarbon group; C 4-18 branched aliphatic hydrocarbon group, or C 6-18 aromatic hydrocarbon group, X represents a group >NH, >N(CH 2 ) n1 COOM 2 , or >CHCOOM 2 , M 2 represents a hydrogen atom, an alkali metal, an aliphatic amine having a C 1-4 carbon atom content, ammonia, or alkanolamine, and m1 and n1 independently indicate integers of 1-3, wherein the strong alkali (a) is present in an amount of 3-50 wt. %, the nonionic surface active agent (b) is present in an amount of 0.01-30 wt. %, and the solubilizing agent (c) is present in an amount of 0.01-30 wt. %.