Production of filled paper

Details Production of filled paper Production of filled paper

1996-02-13

1998-10-27

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

1621643, 1621646, 1621681, 1621682, 1621683, 1621812, 1621816, 1621818, 162183, D21H 2110

Patent

active

058273980

ABSTRACT:
Filled paper is made by adding a cationising amount of cationic polymer to a slurry of precipitated calcium carbonate, mixing this slurry into a cellulosic suspension and forming a thin stock, adding anionic particulate material to the suspension before or after the slurry, mixing a polymeric retention aid into the thin stock which includes the precipitated calcium carbonate and the anionic particulate material, draining the thin stock on a screen to form a sheet and drying the sheet. A suitable slurry for this purpose is a slurry of 5 to 70% by weight precipitated calcium carbonate and cationic polymer selected from 0.1 to 1% cationic starch and 0.01 to 0.3% of a high charge density, relatively low molecular weight, cationic polymer.

REFERENCES:
patent: 4610801 (1986-09-01), Matthews et al.
patent: 4874466 (1989-10-01), Savino
patent: 5026457 (1991-06-01), Eichinger et al.
patent: 5126010 (1992-06-01), Kobayashi et al.
patent: 5147507 (1992-09-01), Gill
patent: 5216014 (1993-06-01), Chung

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