Method of preparing sunscreens

Details Method of preparing sunscreens Method of preparing sunscreens

1992-09-30

1996-11-12

Dodson, Shelley A.

Drug, bio-affecting and body treating compositions

Topical sun or radiation screening, or tanning preparations

424 60, 424 63, 424 64, 514937, 514938, A61K 742, A61K 740, A61K 7021, A61K 7025

Patent

active

055737536

ABSTRACT:
A method of preparing sunscreens in which a dispersion of zinc oxide particles in an oil is formed by milling in the presence of a particulate grinding medium and mixed with cosmetically acceptable materials is claimed. The particles of zinc oxide have an average size of from 0.005 to 0.15 micron and the dispersion is substantially transparent to visible light but with an extinction coefficient at 308 nm (E(308)) and at 360 nm (E(360)) of at least 9 liters per gram per centimeter. The ratio E(360):E(308) is in the range 0.75:1 to 1.5:1. In a preferred method a mixed dispersion containing titanium dioxide and zinc oxide, having E(308) at least 15 liters per gram per centimeter, E(360) at least 10 liters per gram per centimeter and the ratio E(360):E(308) in the range 0.3:1 to 1.5:1 is used. The mixed dispersion is also claimed. The sunscreens prepared have a good balance of absorption for UVA and UVB radiation and better SPF values than those prepared from titanium dioxide and/or zinc oxide powders.

REFERENCES:
patent: Re27818 (1973-11-01), Werner
patent: 2296636 (1942-09-01), Hanahan
patent: 2387534 (1945-10-01), Seidel
patent: 2885366 (1959-05-01), Iler
patent: 3409560 (1968-11-01), Faust et al.
patent: 3410708 (1968-11-01), Mcginnis
patent: 3437502 (1969-04-01), Werner
patent: 3579310 (1971-05-01), Lewis et al.
patent: 3591398 (1971-06-01), Angerman
patent: 3728443 (1973-04-01), Berisford et al.
patent: 3907581 (1975-09-01), Willcox
patent: 3923968 (1975-12-01), Basque et al.
patent: 3928057 (1975-12-01), Decolibus
patent: 3954496 (1976-05-01), Batzar
patent: 4075031 (1978-02-01), Allen
patent: 4199370 (1980-04-01), Brand
patent: 4857305 (1989-08-01), Bernhardt et al.
patent: 4882143 (1989-11-01), Kadokura et al.
patent: 4917883 (1990-04-01), Strobridge
patent: 4923518 (1990-05-01), Brand et al.
patent: 4940574 (1990-07-01), Kaplan
patent: 5000937 (1991-03-01), Grollier et al.
patent: 5028417 (1991-07-01), Bhat et al.

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