Dispersions

Details Dispersions Dispersions

1995-09-20

1997-02-04

Dodson, Shelley A.

Drug, bio-affecting and body treating compositions

Topical sun or radiation screening, or tanning preparations

106436, 424 60, 424400, 424401, 514937, 514938, A61K 742, C09C 136

Patent

active

055995292

ABSTRACT:
Dispersions of titanium dioxide in various media have been known but there has been an increasing demand for the use of titanium dioxide as an absorber for UV light while remaining substantially transparent to visible light. Hitherto it has not been practical to prepare a high solids content oil dispersion of such material having an extremely high maximum extinction coefficient in the ultra violet range of wavelengths.
Such a dispersion has now been developed in an oil of particles of titanium dioxide having an average size from 0.01 to 0.15 micron and an organic dispersing agent in which dispersion the amount of said particles are such that the dispersion has a solid content greater than 40% by weight. The dispersion has a maximum extinction co-efficient in the ultra violet range of wavelengths of at least 40 liters per gram per cm.

REFERENCES:
patent: 3579310 (1971-05-01), Lewis et al.
patent: 3728443 (1973-04-01), Berisford et al.
patent: 3923968 (1975-12-01), Basque et al.
Hirosawa et al., "Paints for the Skin Coloring," Chem. Abst. (Dec. 1977), vol. 87, p. 300, Abstract 87:189306.

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