Jul. 26, 2012  5  US 2012/0186766 Al  19.  The process according to claim  13,  wherein the aque› ous composition additionally comprises at least one further  additive selected from the group consisting of aluminum sul› fate, aluminum nitrate, polyaluminum chloride (PAC), alu› minum hydroxide chloride, organic precipitant, biocide,  deaerator, defoamer, dispersant, adsorbent, fixative, retention  aid, drainage accelerant, dye, optical brightener, internal siz› ing agent, wet strength agent, dry strength enhancer and inter› nal wet web strength polymer (IWWS).  20.  The process according to claim  13,  wherein the aque› ous composition additionally comprises at least one inorganic  filler selected from the group consisting of ground calcium  carbonate (GCC), precipitated calcium carbonate (PCC),  kaolin, titanium dioxide and barium sulfate.  21.  The process according to claim  13,  wherein the pH of  the aqueous composition comprising at least one fiber stock is  adjusted to a value in the range from 4 to 11.  22.  The process according to claim  13,  wherein the step of  adding methanesulfonic acid to the aqueous composition  comprising at least one fiber stock takes place in a paper  machine approach flow.  23.  The process according to claim  13,  wherein the papery  article is selected from graphic paper, office communication  paper, packaging paper, board, card, hygiene paper and spe› cialty paper.  24.  The process according to claim  13,  wherein the papery  article is a packaging material for the food sector.  *  *  *  *  * 