Appeal No. 1997-3118
Application No. 08/372,083
1. A process for preparing an aqueous papermaking
suspension containing pulp fibers and a polyelectrolyte
complex, comprising:
a) providing an aqueous suspension comprised of pulp
fibers and surface active carboxyl compounds;
b) adding to the aqueous suspension a water-soluble
cationic polymer and a water-soluble anionic polymer that are
reactable in the aqueous suspension to form the
polyelectrolyte complex, and a compound containing a
multivalent cation having at least a +3 charge; and
c) forming the polyelectrolyte complex;
wherein said compound containing a multivalent cation is
added at a level such as to provide an amount of cation
equivalent on a molar basis to the amount of aluminum present
in alum added at a level of from about 1.5% to about 6% based
on the dry weight of pulp fibers.
THE REFERENCES
Economou 3,660,338 May 2,
1972
Strazdins 4,002,588 Jan. 11,
1977
Smith 0 362 770 Apr. 11,
1990
(European patent application)
2
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Next
Last modified: November 3, 2007