Process for producing sized paper and cardboard with polyelectrolytes and epoxide-amine-polyamide reaction products

摘要

A process for producing paper or cardboard sized in the pulp with epoxide-amine-polyamide reaction products is disclosed. This process comprises adding to the fibre suspension, which has a pH value of 5 to 8, (A) at least one water-soluble higher molecular polyelectrolyte, which is cationic if the pH value of the fibre suspension is 6.5 to 8 and anionic if the pH value of the fibre suspension is 5 to 7, followed by (B) at least one water-soluble or water-dispersible salt of an epoxide-amine-polyamide reaction product, and further processing the fibre suspension into the form of paper or cardboard.