Paper making and fiber liberation – Processes and products – Non-fiber additive
Patent
1995-02-23
1996-05-21
Chin, Peter
Paper making and fiber liberation
Processes and products
Non-fiber additive
1621683, 1621681, D21H 1734
Patent
active
055185851
ABSTRACT:
Neutral sizing of base paper pulp in a conventional aqueous suspension at a neutral pH for the production of sized, acid-free base paper by internal sizing with the use of aqueous cationic copolymer dispersions having a minimum cation activity of 20 .mu.mol/g of solids, more than half of the cationic charge being located on the surface of the dispersion copolymer particles, in combination with polymeric retention aids, the weight ratio of the polymeric retention aid to the cationic dispersion copolymer preferably being 0.3:1 to 0.005:1, in a quantity of up to 2% by weight of cationic dispersion copolymer, relative to the dry weight of the raw cellulose fibers. The internal sizing is effected by intensive mixing of the neutral sizing agent components with the raw cellulose fiber suspension, with the proviso that either the polymeric retention aid is added first and the cationic plastics dispersion is metered in afterwards or the two agents are metered separately at the same time into the cellulose fiber suspension, if desired with the additional use of inert fillers, pigments, dyes and conventional auxiliaries, and by subsequent isolation of the acid-free base paper in the conventional manner, if appropriate as base paper webs or base paper boards, and drying of the internally sized neutral base paper. In the combination according to the invention with the polymeric retention aid, the cationic plastics dispersion surprisingly shows a synergistic increase of its internal sizing effect in the neutral pH range.
REFERENCES:
patent: 4178205 (1979-12-01), Wessling et al.
patent: 4189345 (1980-02-01), Foster et al.
patent: 4381367 (1983-04-01), Von Bonin et al.
patent: 4659431 (1987-04-01), Probst et al.
Huth Hans U.
Kamutzki Walter
Chin Peter
Hoechst Aktiengesellschaft
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