Process for sizing paper or cardboard with anionic hydrophobic s

Details Process for sizing paper or cardboard with anionic hydrophobic s Process for sizing paper or cardboard with anionic hydrophobic s

1985-09-09

1988-04-05

Chin, Peter

Paper making and fiber liberation

Processes and products

With coating after drying

162158, 1621643, 1621646, 162166, 162167, 1621682, 162175, 162178, 162179, 1621811, 427391, 427395, D21H 308

Patent

active

047356855

ABSTRACT:
Anionic sizing agents containing anhydride groups, which are novel compounds and which contain a single N,N-C.sub.6 -C.sub.22 di(alkyl- or alkenyl)amido group, a N-C.sub.6 -C.sub.22 (alkyl- or alkenyl)amido group or a C.sub.6 -C.sub.22 -(alkyl or alkenyl) ester group as hydrophobic substituent, and at least one anionic group in acid or salt form, in particular the anhydride of a N,N-C.sub.6 -C.sub.22 dialkylamido- or N,N-C.sub.6 -C.sub.22 dialkenylamidocarboxylic acid, the anhydride of a N-C.sub.6 -C.sub.22 alkylamido- or N,N-C.sub.6 -C.sub.22 alkenylamidocarboxylic acid, or the C.sub.6 -C.sub.22 alkyl ester or C.sub.6 -C.sub.22 alkenyl ester of an aromatic tetracarboxylic acid anhydride or a salt thereof, are particularly suitable, together with commerically available retention aids, for use in a process for pulp-sizing or surface-sizing paper or cardboard.

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