METHOD FOR PREPARING LOW FREE FORMALDEHYDE METHYLOLHYDANTOINS AND COMPOSITIONS THEREOF.

摘要

Compositions of dimethyloldimethylhydantoin, monomethyloldimethylhdantoin, and dimethylhydantoin having less than 0.1 percent weight of free formaldehyde based upon 100 percent by weight of total composition; and wherein the weight ratio of dimethyloldimethylhydantoin to monomethyloldimethylhydantoin ranges from about 1:1.25 to about 3.5:1, are provided. These compositions may be prepared (1) by reacting dimethylhydantoin and a formaldehyde-containing source wherein the molar ratio of formaldehyde to demethylhydantoin ranges from about 1.2:1 to about 1.55:1 or (2) by admixing (a) from about 80 to about 90 percent by weight of an aqueous solution of methyloldimethylhydantoin having greater than about 0.1 percent by weight of free formaldehyde with (b) about 20 to about 10 percent by weight of dimethylhydantoin based upon 100 percent weight of aqueous dimethyloldimethylhydantoin solution and dimethylhydantoin combined.