Disclosed are adhesive formulations as creping process aids for producing
an absorbent creped cellulosic sheet having a high level of
surface-perceived softness that comprises continuously forming a web of
cellulosic papermaking fibers, adhering said web to a thermal drying means
by means of adhesive compositions comprising polymers having at least one
primary or secondary amine group in the backbone such as chitosan,
polyvinylamine, polyvinyl alcohol-vinyl amine and polyaminoamide in
combination with crosslinking agents such as dialdehydes or zirconium
compounds having a valence of plus four including ammonium zirconium
carbonate, zirconium acetylacetonate, zirconium acetate, zirconium
carbonate, zirconium sulfate, zirconium phosphate, potassium zirconium
carbonate, zirconium sodium phosphate and sodium zirconium tartrate and
creping said treated web from said thermal drying means. In the method for
producing the absorbent creped cellulosic sheets, the zirconium
crosslinking agent is advantageously applied directly and separately on
the Yankee dryer at the time the base polymer is applied to the surface.
Alternatively, when using dialdehydes, the dialdehydes are mixed with the
base polymer just prior to application to the Yankee dryer surface without
having the crosslinking reaction take place with the base polymer prior to
reaching the heated Yankee surface. These sheets are useful in the
manufacture of tissue and towel.