Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1993-10-15
1995-05-02
Chin, Peter
Paper making and fiber liberation
Processes and products
Non-fiber additive
162179, 1621812, 162183, D21H 1769
Patent
active
054116392
ABSTRACT:
A papermaking process with improved sizing efficiency and reduced size reversion is characterized by the use of a calcium carbonate pigment which is surface treated with an anionic starch-soap complex. The starch-soap complex is precipitated onto the pigment surfaces to provide bonding sites for sizing agents which impart water repellency to the paper. The sizing agents become bound to the starch component of the starch-soap complex to yield more reacted size in paper webs formed from the furnish than would be present without the use of the treated pigment. The use of the surface treated pigment also allows the papermaker to increase the filler content of the paper without sacrificing dry strength properties.
REFERENCES:
patent: 3392085 (1968-07-01), Oliver
patent: 3630830 (1971-12-01), Herdle et al.
patent: 4591412 (1986-05-01), Hechler
patent: 5147507 (1992-09-01), Gill
"Diagnostic Sizing Loss Problem Solving in Alkaline Systems", by B. M. Moyers, 1991 Tappi Journal, pp. 425-432.
"The Interactions of Alkyl Ketene Dimer With Other Wet-End Additives", by A. R. Colasurdo and I. Thorn, Tappi Journal, Sep. 1992, pp. 143-149.
"A Precipitated Starch Product", by C. C. Kesler and W. C. Black, Pulp & Paper Feb. 16-19, 1942, pp. 291-294.
Chin Peter
Westvaco Corporation
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