Patent ID: 7815771

Claim:
Process for the manufacture of paper or board, comprising: adding, to a paper pulp fibrous suspension, at least one main retention aid composed of a cationic (co)polymer, resulting in the formation of flocs in the suspension; optionally shearing the flocs; and adding to the suspension, separately or as a mixture, in any order: at least one secondary retention aid chosen from the group consisting of silica derivatives and anionic or amphoteric organic polymers, and at least one tertiary retention aid composed of a crosslinked anionic organic polymer having a particle size of greater than or equal to 1 micrometer and exhibiting an intrinsic viscosity of less than 3 dl/g; wherein the one or more anionic or amphoteric organic polymers that are contained in the secondary retention aid differ from the crosslinked anionic organic polymer of the tertiary retention aid.