US 6,982,069 B2 | ||
Dye fixing agent for water-color ink, ink jet recording medium and porous hydrotalcite compound | ||
Kanako Tanaka, Kagawa (Japan); and Akira Okada, Kagawa (Japan) | ||
Assigned to Kyowa Chemical Industry Co., Ltd., Kagawa (Japan) | ||
Filed on Jun. 30, 2003, as Appl. No. 10/608,262. | ||
Application 10/608262 is a division of application No. 09/857868, abandoned, previously published as PCT/JP00/07190, filed on Oct. 17, 2000. | ||
Claims priority of application No. 11-295751 (JP), filed on Oct. 18, 1999; application No. 11-299735 (JP), filed on Oct. 21, 1999; application No. 11-326001 (JP), filed on Nov. 16, 1999; application No. 2000-122005 (JP), filed on Apr. 24, 2000; and application No. 2000-122006 (JP), filed on Apr. 24, 2000. | ||
Prior Publication US 2004/0091683 A1, May 13, 2004 | ||
Int. Cl. C01B 33/24 (2006.01) |
U.S. Cl. 423—327.1 | 10 Claims |
1. A porous hydrotalcite compound represented by the following formula (1):
MII1-xAlx(OH)2(A1n−)a(A2m−)b·yH2O (1)
wherein MII is Mg2+ or/and Zn2+, A1n− is a silicic acid ion (HSi2O5−) and a sulfuric acid ion (SO42−), or a silicic acid ion (HSi2O5−), A2m− is an anion selected from the group consisting of CO32−, NO3−, Cl− and OH−, x and y satisfy 0.50<x≤0.80 and 0<y<2, and
b satisfy 0.50<na+mb≤0.80, and having a BET specific surface area of 50 to 400 m2/g.
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