Preparation of a wax containing paper sheet

In a process for the preparation of a paper sheet by dewatering a slurry of cellulosic fibers, the improvement which comprises treating the cellulosic fibers in the slurry with from 0.1 to 5 pounds per ton of the cellulosic fibers on a dry basis with a thermosetting, cationic polyamine or polyamide wet-strength resin, subsequently adding to the slurry of from 0.5 to 10 pounds per ton of dry cellulosic fiber in the slurry of a stabilizer comprising a mixture of an aqueous wax emulsion containing from 25 to 60 weight percent wax and, based upon the weight of the wax, of from 10 to 60 weight percent of a water-soluble, thermosetting urea-formaldehyde resin and from 20 to 90 weight percent of an aldehyde donor selected from the group consisting essentially of tris (hydroxymethyl) nitromethane, mono- and bicyclic oxazolidines and mixtures thereof, said mono- and bicyclic oxazolidines having formulas of:

• ##EQU1## where R.sub.1 and R.sub.2 represent alkyl radicals of from 1 to 2 carbon atoms, and ##EQU2## where R.sub.3 represents an alkyl or hydroxyalkyl radical of from 1 to 2 carbon atoms,
• dewatering the paper sheet, and drying the paper sheet.