SUNSCREEN COMPOSITIONS CONTAINING A COMBINATION OF A LINEAR ULTRAVIOLET RADIATION-ABSORBING POLYETHER AND OTHER ULTRAVIOLET-SCREENING COMPOUNDS
Publication Date: 2016-Aug-18
The IP.com Prior Art Database
Sunscreen composition including a combination of a linear ultraviolet radiation absorbing polyether that includes a covalently bound UV-chromophore, and at least one non-polymeric UV-screening compounds.
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SUNSCREEN COMPOSITIONS CONTAINING A COMBINATION OF A LINEAR
ULTRAVIOLET RADIATION-ABSORBING POLYETHER AND OTHER
FIELD OF THE INVENTION
The present invention relates to topically-acceptable sunscreen compositions comprising a combination of linear UV-absorbing polyethers and other additional UV- screening compounds, sunscreen products made of such sunscreen compositions, and the processes of protecting keratinous substrates.
BACKGROUND OF THE INVENTION
Skin aging is the result of more than just chronological age, as skin is exposed to various environmental stresses, such as UV rays, which cause free radicals to form in the skin. The prolonged exposure to various environmental stresses such as ultraviolet (UV) radiation from the sun, can lead to the formation of free radicals in the skin and light
dermatoses and erythemas, as well as increase the risk of skin cancers, such as melanoma, and accelerate skin aging, such as loss of skin elasticity and wrinkling.
Depending on the wavelength, UV radiation causes different types of skin damage. UV-B radiation (about 290 to about 320 nm) is responsible for sunburn and can cause skin cancer. UV-A radiation (about 320 to about 400 nm) while producing tanning of the skin,
contributes also to sunburn and the induction of skin cancers. Moreover, the harmful effects of the UV-B radiation may be aggravated by UV-A radiation. Therefore, an effective sunscreen formulation preferably comprises both at least one UV-A and UV-B filter and a broad band UV filter covering the full range from about 290nm to about 400 nm to prevent the human skin from the damage of sunlight.
The degree of UV protection afforded by a sunscreen composition is directly related to the amount and type of UV-screening compounds present therein. The more UV-screening compounds present, the greater the degree of UV protection.
Numerous sunscreen compositions are commercially available with varying ability to shield the body from ultraviolet light. However, numerous challenges still exist to provide
sunscreen compositions that provide strong UV radiation protection. The challenge of creating sunscreens with various properties, e.g., mildness, etc., is further magnified if one imposes additional constraints on the sunscreen composition.
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The present invention provides mild, aesthetic sunscreen compositions that include a combination of linear UV-absorbing polyethers and other additional UV-screening compounds.
SUMMARY OF THE INVENTION
The invention includes sunscreen compositions including a combination of a polymer composition that includes a linear ultraviolet radiation absorbing polyether that includes a covalently bound UV-chromophore, and at least one additional UV-screening compounds. Such sunscreen compositions provide unexpected synergic protection from ultraviolet radiation.
DETAILED DESCRIPTION OF THE INVENTION
Unless defined otherwise, all technical and...