C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
C01B 33/193 (2006.01) C01B 33/18 (2006.01) C01B 33/187 (2006.01) D21H 17/68 (2006.01) D21H 21/52 (2006.01)
Patent
CA 2265234
The present invention relates to a process for easily and efficiently producing silica particles having a narrow particle size distribution and a high porosity from inexpensive starting materials such as sodium silicate. The silica particles of the present invention can be obtained in the form of a slurry containing them by (1) forming a slurry by mixing first particles difficultly soluble in an alkali and soluble in an acid, with an aqueous alkali silicate solution to form a first slurry containing the first particles, (2) neutralizing the first slurry with a mineral acid to prepare a second slurry containing second particles wherein silica.is deposited on the first particles, and (3) adding a mineral acid to the second slurry to dissolve the first particles from the second particles, to prepare a third slurry containing silica particles. When the silica particles of the present invention are used as a filler even in a small amount for paper making, the resultant papers have excellent brightness, opacity, opacity-after-printing, etc.
Kitao Osamu
Matsuda Masashi
Okada Hitoshi
Wada Motohide
Watanabe Masasuke
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
Oji Paper Co. Ltd.
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