| abstract |
The invention relates to a process for the production of paper, cardboard and cardboard by dewatering a paper stock in the presence of condensates of basic amino acids with sheet formation. In particular, homo- and cocondensates of lysine and the crosslinked condensates obtainable therefrom by reaction with crosslinking agents are used in amounts of 0.01 to 5% by weight, based on dry paper stock, as a means of increasing the dry and wet strength and the absorbency of paper , used to fix anionic dyes and contaminants in paper, to increase the drainage rate and retention as well as the effectiveness of synthetic anionic and cationic retention aids in the production of paper, cardboard and cardboard by dewatering a paper material with sheet formation. |