PROCESS OF MAKING PAPER

摘要

During the manufacture of paper from a cellulosic suspension, retention is improved by adding to the suspension a water soluble cationic polymer containing 0.1 to 15 mole % cationic monomer groups and having IV at least 4dl/g and then adding a substantially water soluble formaldehyde condensate resin. This resin is preferably a phenol sulphone formaldehyde resin. Preferred phenol sulphone formaldehyde resins are materials wherein at least 70 mole % of the recurring groups are dihydroxy phenyl sulphone groups free of sulphonic acid groups.