Use of calcuim carbonate particles in papermaking
AssigneeSolvay (Socete Anonyme)
InventorMike Ball
Life of this patent
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Abstract
A process for the production of paper by introducing a suspension of ultrafine calcium carbonate particles to a fiber-containing suspension. A method for improving the dewatering of a fiber-containing suspension. Use of a calcium carbonate suspension comprising ultrafine particles of calcium carbonate as a substitute for colloidal silica as a dewatering agent in the formation of paper from a fiber-containing suspension. At least one ionic polymer is introduced in the fiber-containing suspension.
Claims25
1-10. (canceled)
A process for the production of paper, comprising the steps of:
- (a) providing a fiber-containing suspension containing cellulose fibers, and optional fillers;
- (b) introducing at least one suspension comprising ultrafine particles of calcium carbonate to the fiber-containing suspension, and
- (c) forming and dewatering the fiber-containing suspension resulting from step (b),
- wherein the ultrafine calcium carbonate particles have an average size lower than or equal to 200 nm.
A method for improving the dewatering of a fiber-containing suspension containing cellulose-fibers, said method comprising the addition of a calcium carbonate suspension comprising ultrafine particles of calcium carbonate to a fiber-containing suspension containing cellulose-fibers, wherein the ultrafine calcium carbonate particles have an average size lower than or equal to 200 nm.
A method which comprises the use of a calcium carbonate suspension comprising ultrafine particles of calcium carbonate as a substitute for colloidal silica as a dewatering agent in the formation of paper from a fiber-containing suspension containing cellulose-fibers, wherein the ultrafine calcium carbonate particles have an average size lower than or equal to 200 nm.
Dependencies are inferred from the claim text.