ph that do not interfere with the reaction such as sodium hydroxide tetrabutylammonium hydroxide and benzyltrimethylammonium hydroxide the organic sulfonates of the above formula do not readily lend themselves to 34 internal 34 or 34 engine 34 sizing procedures inasmuch as the basic conditions required for reaction between the cellulose fibers and the sulfonate generally far exceed those normally found in the head box or other stage of the paper making process during which additives are added to the slurry therefore when sizing paper according to the method of the invention it is preferred to 34 surface size 34 the paper any conventional surface sizing techniques may be employed to carry out the invention thus the paper sheet may be passed through a tub of a solution of the organic sulfonate or passed over a roller or other applicator in contact with a solution of the sulfonate those skilled in the art having been exposed to the principles of the invention will be aware of suitable techniques for achieving the sizing reaction without the exercise of undue experimentation when sizing paper it is preferable to react the cellulosic fibers thereof with about a 2 weight volume solution of the organic sulfonate amounts less than 0 5 weight volume will not enhance the hydrophobicity of the cellulosic fibers to any significant degree generally amounts greater than about 5 weight volume will not result in any added degree of hydrophobicity the preferred method of carrying out the invention is to pre wet the paper substrate with an aqueous solution of the base and then wet the substrate with a solution of the organic sulfonate for.