FIELD: paper-and-pulp industry.
SUBSTANCE: calcium carbonate product is designed for containing paper and comprises mixture of first and second separate calcium carbonate particles, wherein difference between first and second calcium carbonate particles ranges from about 0.1 μm to 0.2 μm and weight ratio of first to second particles lies between about 50:50 and about 80:20. Pigment is intended for coating paper and made from above-defined product. Method concerns containing paper and comprises preparation of mixed pigment based on calcium carbonate precipitated in the form of aragonite having above-indicated makeup; addition of binder; and deposition of the pigment onto a base paper in the form of binder-containing suspension. Paper is then dried and calendared. Also described are: paper obtained by above method; a method to increase gloss of paper sheet involving operation of including above product into base paper coating suspension; a method to increase gloss of paper involving operation including calcium carbonate product wherein first calcium carbonate particles have average size about 0.4 μm and the second ones about 0.5 μm at their weight ratio 60:40, respectively; a method to increase gloss of paper sheet involving operation of including pigment based on argonite-type calcium carbonate with difference between first and second average particle size values from about 0.1 μm to 0.2 μm and their weight ratio between about 50:50 and about 80:20 into base paper coating suspension.
EFFECT: increased gloss of coated paper sheets.
24 cl, 3 tbl
