Process for preparation of paper-making hydrous silicic acid fil

Details Process for preparation of paper-making hydrous silicic acid fil Process for preparation of paper-making hydrous silicic acid fil

1986-10-31

1988-12-13

Rosenbaum, Mark

Solid material comminution or disintegration

Processes

With application of fluid or lubricant material

241 21, 241 24, 241 29, 106492, B02C 1912

Patent

active

047904860

ABSTRACT:
An improved paper-making hydrous acid filler is prepared by classifying or pulverizing a slurry containing fine particles of hydrous silicic acid, which is obtained by neutralizing sodium silicate with sulfuric acid, by a wet classifier or a wet pulverizer, so that the proportion of particles having a particles size of 1 to 30 .mu.m is at least 80% and the proportion of particles having a particle size of at least 70 .mu.m is not more than 0.4%. The filler has a function of improving the ink receptivity of the paper of the internal additive type and is capable of improving the opacity of the paper after printing.

REFERENCES:
patent: 3716493 (1973-02-01), Acker et al.

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