Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Group iiia metal or beryllium
Reexamination Certificate
2007-02-02
2008-12-23
Vanoy, Timothy C (Department: 1793)
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Group iiia metal or beryllium
C423S155000, C423S166000, C423S544000, C423S555000, C423S625000, C423S635000
Reexamination Certificate
active
07468169
ABSTRACT:
This invention provides a production process, which can stably produce high-quality satin white (calcium trisulfoaluminate) having very small and homogeneous particulate shapes suitable for incorporation into coated paper for printing, and an apparatus for use in said process. In this process for producing calcium trisulfoaluminate, a calcium hydroxide suspension (A) is reacted with an aqueous aluminum sulfate solution (B) to produce calcium trisulfoaluminate (C). The aqueous aluminum sulfate solution (B) is added in plurality of stages to the calcium hydroxide suspension (A). At least any one stage of the plurality of stages addition, addition of the aqueous aluminum sulfate solution (B) to the calcium hydroxide suspension (A) is carried out in such a manner that the aqueous aluminum sulfate solution (B) is continuously added to the calcium hydroxide suspension (A) being continuously transferred.
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“Pigment for Coating and Filler for Paper”; Translated by Ooe, Reizaburo; Yoshimoto, Saburo; Issued on Jan. 20, 1989; pp. 183-188.
International Search Report corresponding to International Application No. PCT/JP2005/013609 dated Aug. 23, 2005.
Hirabayashi Tetsuya
Kishida Takayuki
Kojima Yoshiki
Mitsui Kenichi
Nakano Masaki
Alston & Bird LLP
OJI Paper Co. Ltd.
Vanoy Timothy C
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