Process for the production of paper

A process for the production of paper which comprises providing a suspension of cellulose containing fibers, and optional fillers;

• adding to said suspension i) at least one low molecular weight cationic organic polymer having a molecular weight below 700,000 selected from the group consisting of modified starches, polyamines, polyethylene imine polyamideamine/-epichlorohydrin, dialkylamine/epichlorohydrin, homo-and copolymers based on monomers selected from diallyldimethyl ammonium chloride vinyl amines (meth acrylamides, and (meth) acrylates;
• ii) at least one high molecular weight cationic or amphoteric polymer drainage and/or retention aid having a molecular weight above 1,000,000 selected from the group consisting of cationic and amphoteric starches, guar gums, acrylamide-based polymers, N-vinylamide-based polymers, diallyldi-methyl ammonium chloride-based polymers cationic polyethylene imines, polyamines and polyamedeamines;
• said low molecular weight and high molecular weight polymers being added in an amount of at least 0.01 kg/ton to 30 kg/ton, calculated as dry polymers on dry fibers and optional fillers, the weight ratio of said high molecular weight polymer to said low molecular weight polymer being within the range of from 30:1 to 1:20, wherein said low molecular weight polymer and said high molecular weight polymer are simultaneously added to the suspension at essentially the same position in the stock preparation or paper machine;
• and (iii) anionic inorganic particles selected from the group consisting of silica based particles, clays of the smectite type, titanyl sulphate sols, and mixtures thereof, said particles being added in an amount of at least 0.01 kg/ton, calculated as dry particles on dry fibers and optional fillers;
• and forming and draining the obtained suspension on a wire to form paper.