Papermaking process

Details Papermaking process Papermaking process

1989-09-22

1990-10-09

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

162178, 1621816, 162183, D21H 1724, D21H 1774

Patent

active

049618253

ABSTRACT:
In the production of paper or pulp sheets from a paper stock, a binder is added which comprises cationic and anionic components to improve the paper characteristics and the stock characteristics, such that increased retention and a more readily dewatered stock are obtained.
The anionic component consists of colloidal anionic particles having at least one surface layer of aluminum silicate or aluminum-modified silicic acid, such that the surface groups of the particles contain silicium and aluminum atoms in a ratio of from 9.5:0.5 to 7.5:2.5.
The cationic component consists of cationic carbohydrate having a degree of substitution of 0.01-1.0.

REFERENCES:
patent: 3520824 (1970-07-01), Plank et al.
patent: 4385961 (1983-05-01), Svending et al.
patent: 4388150 (1983-06-01), Sunden et al.

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