Method for production of aqueous dispersion of N-substituted N',N'-alkylene urea

A method for the production of an aqueous dispersion of a water insoluble N-substituted N',N'-alkylene urea having the general formula I:

• ##STR20## wherein R.sup.1 denotes alkyl having 6 to 20 carbon atoms, phenyl or ##STR21## in case of m=1, or R.sup.1 denotes alkylene having 6 to 20 carbon atoms, phenylene or ##STR22## in case of m=2, where X denotes H, CH.sub.3 or OCH.sub.3 and n is 0 or 1, R.sup.2 denotes H or CH.sub.3, R.sup.3 denotes H, CH.sub.3 or C.sub.2 H.sub.5 and R.sup.4 denotes H or CH.sub.3, by the reaction of an alkylene imine having 2 to 4 carbon atoms with an isocyanate represented by the general formula II:
• R--NCO (II)
• wherein R denotes an alkyl having 6 to 20 carbon atoms, ##STR23## wherein X and n are the same as above in the presence of at least one surface active agent selected from the group consisting of (a) at least one anionic surface active agent selected from the group consisting of alkyl-sulfate type R--OSO.sub.3 Na, polyoxyethylene-alkyl ether sulfate type R--O(CH.sub.2 CH.sub.2 O).sub.n SO.sub.3 Na, polyoxyethylene-alkylphenyl ether sulfate type ##STR24## .beta.-naphthalene sulfonic acid-formaldehyde polycondensate type ##STR25## and (b) at least one nonionic surface active agent selected from the group consisting polyoxyethylene alkyl ether type R--O(CH.sub.2 CH.sub.2 O).sub.n H, polyoxyethylene alkylaryl ether type ##STR26## olyoxyethylene carboxylic ester type R--COO(CH.sub.2 CH.sub.2 O).sub.n H and polyoxyethylene sorbitan fatty ester type ##STR27## (wherein R' represents an alkyl having 6 to 25 carbon atoms and m an integer having the value of 5 to 50) at a temperature of not more than 25.degree. C. under vigorous stirring or grinding.