Process for the manufacture of paper or cardboard which is sized

Details Process for the manufacture of paper or cardboard which is sized Process for the manufacture of paper or cardboard which is sized

1985-09-09

1988-04-12

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

1621643, 1621646, 162166, 162167, 1621682, 162175, 162178, 162179, 1621811, D21H 308

Patent

active

047372397

ABSTRACT:
Sizing agents devoid of anhydride groups, some of which are known and others are novel compounds, and which carry a single N,N-C.sub.6 -C.sub.22 alkyl(or alkenyl)amide group as hydrophobic substituent and at least one anionic group, in particular N,N-C.sub.6 -C.sub.22 dialkyl or N,N-C.sub.6 -C.sub.22 dialkenyl partial amides of a dicarboxylic acid, tricarboxylic acid or sulfocarboxylic acid, or the salts thereof, are particularly suitable, together with commercially available retention aids, for use in a process for pulp-sizing paper or cardboard at a pH of at least 6.5 of the fibre suspension, in the absence of e.g. aluminium sulfate, or in a process for surface-sizing paper.

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