Process for preparation of paper-making hydrous silicic acid...

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

B - Operations, Transporting

02

C

241/135

B02C 23/18 (2006.01)

Patent

CA 1275994

PROCESS FOR PREPARATION OF PAPER-MAKING HYDROUS SILICIC ACID FILLER ABSTRACT OF THE DISCLOSURE 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 µm is at least 80% and the proportion of particles having a particle size of at least 70 µm 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.

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