Process for the preparation of coated paper and cardboard and co

Details Process for the preparation of coated paper and cardboard and co Process for the preparation of coated paper and cardboard and co

1982-08-19

1985-01-22

Chin, Peter

Paper making and fiber liberation

Processes and products

With coating after drying

162158, 1621681, 162184, 427326, 427391, D21F 1100

Patent

active

044950292

ABSTRACT:
A method for the coating of a raw paper or cardboard substrate wherein the substrate is prepared having a pH of less than about 6.5, and a coating is applied thereto composed of an aqueous dispersion of a plastic and an inorganic pigment, the coating having a pH of more than about 6.5 wherein the particles of the plastic in the dispersion have a non-cation-active charge and wherein the coating also contains a material which does not affect the preparation or storage stability of the coating, but which in the pH range below about 6.5 becomes highly cation-active, and then drying the thus applied coating. Using this method, the coating solidifies at the time of contact of the coating and the paper surface thereby minimizing penetration of the coating into the paper. As a result, improved coated papers are obtained.

REFERENCES:
patent: 3578493 (1971-05-01), Smith
patent: 4226749 (1980-10-01), Veante

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