Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1995-06-08
1997-07-01
Baxter, Janet C.
Paper making and fiber liberation
Processes and products
Non-fiber additive
D21H 1767
Patent
active
056434154
ABSTRACT:
Novel precipitated calcium carbonate particles of varying size and shape, are prepared by adding gaseous carbon dioxide to an aqueous slurry containing basic calcium carbonate under a selectively controlled reaction environment. In its preferred embodiment precipitated calcium carbonate particles having a prismatic shape and an average equivalent spheroidal diameter of between about 1.5 and about 6.5 microns; large irregularly shaped particles having an average equivalent spherical diameter of between about 15 and about 25 microns; and multi-faceted spheroidal particles having an average equivalent spherical diameter of between 5 and about 15 microns, are provided. The reaction environment includes temperatures of between 0.degree. C. and 60.degree. C. and a surface active polyphosphate additive present in amounts of from about 0.1 and about 1.0 percent by weight.
REFERENCES:
patent: 4181567 (1980-01-01), Riddell et al.
patent: 4714603 (1987-12-01), Vanderheiden
patent: 5043017 (1991-08-01), Passaretti
patent: 5215734 (1993-06-01), Kunesh et al.
patent: 5458679 (1995-10-01), Fairchild
Baxter Janet C.
Harding Amy M.
Pantuliano Michael J.
Powell Marvin J.
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