High pH colloidal dispersion of a cerium compound, and a process

Details High pH colloidal dispersion of a cerium compound, and a process High pH colloidal dispersion of a cerium compound, and a process

1995-09-12

1999-07-13

Lovering, Richard D.

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Cosmetic, antiperspirant, dentifrice

106 1421, 502304, 516 89, A61K 700, B01J 1300, B01J 2310, C23F 1100

Patent

active

059223308

ABSTRACT:
In a first embodiment of the invention, a colloidal dispersion of a cerium compound is characterised in that it has a pH of at least 4 and a conductivity of at most 5 mS/cm. In a second embodiment, the colloidal dispersion is characterised in that it has a pH of more than 5. In a third embodiment, the colloidal dispersion is characterised in that the colloids have a carbon content such that the carbon/cerium mole ratio is at Least 0.01 and in that the pH is greater than 5.
A process for the preparation of these dispersions is characterised in that a first colloidal dispersion is used as a starting material, with a pH which is lower than the pH of the dispersion which is to be prepared, and the pH of the first dispersion is raised while reducing the ionic strength. For the third embodiment, an organic acid is added to the starting dispersion.

REFERENCES:
patent: 3024199 (1962-03-01), Pasfield
patent: 4231893 (1980-11-01), Woodhead
patent: 4356106 (1982-10-01), Woodhead et al.
patent: 4699732 (1987-10-01), Woodhead
patent: 5021192 (1991-06-01), David et al.
patent: 5132048 (1992-07-01), Picard-Seon et al.
patent: 5376305 (1994-12-01), Chane-Ching et al.
patent: 5449403 (1995-09-01), Andrean et al.

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