C - Chemistry – Metallurgy – 09 – C
Patent
C - Chemistry, Metallurgy
09
C
C09C 3/06 (2006.01) C09C 1/00 (2006.01) C09C 1/30 (2006.01) C09C 1/36 (2006.01) D21H 17/67 (2006.01)
Patent
CA 2191932
The composite particles of titania and silica are provided, which are useful as a filler in paper making and impart excellent brightness and opacity to the resultant paper. The composite particles comprise the secondary silica particles used as a core and 2 to 25 % by weight, based on silica, of crystalline titanium dioxide carried by the surface of the secondary silica particles. The average particle diameter of the composite particles is 3 to 25 µ m and at least 80 % by weight of the particles have a diameter of 1 to 30 µ m. The composite particles are obtained by (1) adding a mineral acid to an aqueuos alkali silicate solution at 20 to 80°C so that said mineral acid is added in an amount of 30 to 70 % by weight of the total amount of said mineral acid necessitated for neutralizing said aqueous alkali silicate solution, and increasing the temperature of the resultant mixture to 60 to 100 °C in case where the temperature of the mixture is below 60 °C , so as to precipitate secondary silica particles in said mixture; (2) adding crystalline titanium dioxide to said secondary silica particles at a pH of 7 or higher, said titanium dioxide being used in an amount of 2 to 25 % by weight of the total silica contained in said aqueous alkali silicate solution, to form a slurry; and (3) adding a mineral acid to the slurry to control the pH of the slurry to 3 to 6.5.
Hieta Kaoru
Matsuda Masashi
Miyawaki Hidemitsu
Oji Paper Co. Ltd.
Swabey Ogilvy Renault
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