Process for the manufacture of paper and board

Details Process for the manufacture of paper and board Process for the manufacture of paper and board

2004-11-08

2010-10-19

Fortuna, José A (Department: 1791)

Paper making and fiber liberation

Processes and products

Non-fiber additive

C162S164100, C162S168100, C162S168300, C162S181200, C162S181800, C162S181600, C162S183000

Reexamination Certificate

active

07815771

ABSTRACT:
A process for the manufacture of paper, board or similar products, comprisesfirst of all, adding, to the paper pulp fibrous suspension, at least one main retention aid composed of a cationic (co)polymer.Then optionally the flocs obtained are sheared.Subsequently there is added 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, andat least one tertiary retention aid composed of a crosslinked anionic organic polymer with a size of greater than or equal to 1 micrometer and exhibiting an intrinsic viscosity of less than 3 dl/g.

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