Preparation of aminoplasts

In the process of preparing an etherified methylolaminotriazine resin concentrate from the aminotriazine, formaldehyde, an etherifying alcohol and an acid condensation catalyst, the improvement according to which those materials are interreacted in essentially a single step by mixing them in a proportion providing 0.77 to 3 mols of formaldehyde, 2.5 to 7 mols of alcohol having up to four carbons, and no more than 3 mols of water, for every mol of --NH.sub.2 in the aminotriazine, at least 40 mol precent of the alcohol being methanol, heating the mixture in a closed container at a pressure at least as high as 0.1 atmosphere gauge and a temperature from about 85.degree. to about 115.degree. C, and terminating the condensation after 0.2 to 20 minutes of such heating.