Drug – bio-affecting and body treating compositions – Topical sun or radiation screening – or tanning preparations
Reexamination Certificate
1997-11-24
2001-09-18
Dodson, Shelley A. (Department: 1616)
Drug, bio-affecting and body treating compositions
Topical sun or radiation screening, or tanning preparations
C424S060000, C424S400000, C424S401000
Reexamination Certificate
active
06290936
ABSTRACT:
BACKGROUND
Sunscreens are substances or compositions applied to the skin to protect the skin from sunbum caused by the sun's ultraviolet rays. When uniformly applied to the body, sunscreens can be highly effective in protecting against sunburn. However, sunscreen failure can occur when areas of the body are missed because the sunscreen is hard to see or visualize after being applied or rubbed onto the skin. Children are at greater risk of sunburn than adults, since coverage on children's skin tends to be more incomplete, uneven or inconsistent. WO 94/26233 teaches that phenolphthalein, a color indicator, can be added to sunscreens, provided the sunscreens are formulated at a pH greater than 9.0. However, phenolphthalein can induce skin rashes and eruptions. Additionally, sunscreens with this pH are highly alkaline and also can be irritating to the skin. WO 95/28912 teaches composite UV sunblock compositions that may contain colored particles. When the sunscreen of WO 95/128912 is topically applied to the skin, the sunscreen remains visibly colored. Accordingly, an approach was sought to provide a sunscreen which could be readily visualized after the sunscreen has been applied to the skin and would substantially disappear when dried on the skin and/or rubbed out on the skin.
SUMMARY OF INVENTION
It has been surprisingly and unexpectedly found that although the inclusion of a water-soluble dye to a sunscreen emulsion can render the sunscreen visually colored, that such coloration would substantially disappear when the sunscreen emulsion dries after it is spread on the skin and/or is rubbed out.
Thus, in one embodiment, the present invention is directed towards a colored, sunscreen emulsion comprising:
a) at least one water-soluble dye that imparts a color other than white to the sunscreen emulsion, such that when the sunscreen emulsion dries after it is spread on the skin and/or is rubbed out, the color substantially disappears;
b) at least one sunscreen active in an amount effective to protect against the actinic radiation of the sun;
c) at least one emulsfier; and
d) sufficient water to form the colored emulsion.
Preferably, the water-soluble dye is an External DC color or mixtures thereof, more preferably a mixture of Ext DC violet #2 and Ext DC red#33. Most preferably the water soluble dye is a mixture of Ext DC violet #2 and Ext DC red#33 in a ratio of 95:5, respectively. The amount of the water-soluble dye in the emulsion can range from about 0.0005 to about 0.5 weight percent of the emulsion, preferably from about 0.01 to about 0.05 weight percent of the emulsion. Also preferred is that the emulsion is an oil-in-water emulsion.
Optionally, the colored, sunscreen emulsion can contain one or more additional ingredients, including emollients, waterproofing agents, dry-feel modifiers, antimicrobial preservatives and/or fragrances.
In another embodiment, the present invention is directed towards a method for protecting the skin against sunburn comprising topically applying the sunscreen emulsion as described above to the skin.
One advantage of the present invention is that it provides a sunscreen and a method for protecting against sunburn that enables the user to apply the sunscreen more completely and uniformly to the skin, thus providing more effective protection against sunburn.
A second advantage of the present invention is that it provides a sunscreen with a color indicator which is substantially non-staining to the skin or the clothes.
A third advantage of the present invention is that it provides a colored sunscreen and a method for protecting against sunburn which is more fun for children to use because of the attactiveness and appealing nature of the color indicator.
REFERENCES:
patent: 2366759 (1945-01-01), Thomas et al.
patent: 2496270 (1950-02-01), Coler
patent: 2948657 (1960-09-01), Siccama et al.
patent: 4954544 (1990-09-01), Chandaria
patent: 5426210 (1995-06-01), Kato
patent: 5523075 (1996-06-01), Fuerst et al.
patent: 5543137 (1996-08-01), Repper et al.
patent: 5562896 (1996-10-01), Repper et al.
patent: 5567420 (1996-10-01), McEleney et al.
patent: 5609852 (1997-03-01), Galley et al.
patent: 5747011 (1998-05-01), Ross et al.
patent: 0 420 713 B1 (1993-11-01), None
patent: 94/26233 (1994-11-01), None
patent: WO 95/28912 (1995-11-01), None
patent: WO 96/14826 (1996-05-01), None
Fishman, “Certified dyes”, Happi, p.28, Jan. 1995.*
“Concise Encyclopedia Chemistry”, Walter de Gruyter, Berlin, New York, pp.437 and 438, 1994.*
Abstract of FR 2509989 Jan. 1983.
Abstract of JP 61192778 Aug. 1986.
Abstract of JP 61192780 Aug. 1986.
Abstract of JP 61192781 Aug. 1986.
Abstract of JP 8104612 Apr. 1996.
L. Calvo, “Formulating Color Cosmetics Worldwide,”Cosmetics and Toiletries, 1994.
Packaging for “Banana Boat Aloe Vera Dry Skin Protective Body Lotion” —date unknown.
Packaging for “Oil of Olay Daily UV Protectant Beauty Fluid”-date unknown.
Packaging for “Oil of Olay Daily UV Protectant Cream”-date unknown.
Packaging for “L'Oreal Plenitude Active Daily Moisture Lotion”—date unknown.
Packaging for “Lucky Kentucky Udder-Wize Moisturizing Balm”—date unknown.
Morefield Elaine M.
Ross Jamie S.
Dodson Shelley A.
Franks Robert A.
Lamm Marina
Majka Joseph T.
Schering-Plough Healthcare Products Inc.
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