FRICTIONAL RESISTANCE REDUCING AGENT FOR AQUEOUS MEDIUM AND FRICTIONAL RESISTANCE REDUCTION METHOD FOR AQUEOUS MEDIUM USING THE AGENT

PROBLEM TO BE SOLVED: To obtain a frictional resistance reducing agent free from precipitation at a low temperature, stably usable for a long time, capable of reducing the frictional resistance of an aqueous medium in a wide temperature range and useful for a heating-cooling system in an industrial plant, etc., by compounding a specific quaternary ammonium cation with an organic acid residue. SOLUTION: This frictional resistance reducing agent is composed of (A) a cation of formula I R is a 8-22C (branched) (un)saturated aliphatic hydrocarbon; R and R are each a group of formula II [Z is H or methyl; (n)=1-5]; R is R , R , methyl or ethyl; Y is O, CONH or COO; (m)=1-5} and (B) an organic acid residue. For instance, the frictional resistance reducing agent is composed of a salt of the component A [e.g. lauryloxypropyldi(hydroxyetyl) methylammonium chloride] and an organic acid salt [e.g. sodium salicylate].