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United States Patent | 3,650,704 |
Kumura , et al. | March 21, 1972 |
A synthetic hydrotalcite having the composition expressed by the formula; A1.sub.2 0.sub.3.sup.. 6MgO.sup.. CO.sub.2.sup.. 12H.sub.2 0 and having substantially the following diffraction X-ray diffraction analysis: d.A. 7.75, 3.89, 2.59, 2.30, 1.96, 1.53 and 1.50 Said synthetic hydrotalcite containing heavy metal impurities in amounts of up to 30 p.p.m., being insoluble or substantially insoluble when treated with 1/10 N NaOH at 37.degree. C. for 1 hour, having an acid consuming capacity of at least 240 m1./g, and being characterized by such properties that the time required for the artificial gastric juice to come to have a pH of higher than 3.0 is up to 30 seconds and time during which the pH of the artificial gastric juice is maintained above 3.0 is more than 120 minutes.
Inventors: | Kumura; Teruhiko (Takamatsu-shi, JA), Imataki; Norio (Takamatsu-shi, JA), Hasui; Katuyuki (Ohkawa-gun, Kagawa-ken, JA), Inoue; Takeo (Ohkawa-gun, Kagawa-ken, JA), Yasutomi; Kimiaki (Ohkawa-gun, Kagawa-ken, JA) |
Appl. No.: | 05/000,925 |
Filed: | January 6, 1970 |
Application Number | Filing Date | Patent Number | Issue Date | ||
654977 | Jul., 1967 | 3539306 | |||
Jul 25, 1966 [JA] | 41/48349 | |||
Current U.S. Class: | 423/415.1 ; 423/420.2; 424/686 |
Current International Class: | C01F 7/00 (20060101); G01f 005/00 (); C01f 007/00 (); A61k 027/00 () |
Field of Search: | 23/315 424/127,154 |
2958626 | November 1960 | Schenck et al. |