DE853504C - Means for the selective absorption of ultraviolet rays - Google Patents

Description

Means for the selective absorption of ultraviolet rays As is well known, substances are required for the most varied of uses which are able to absorb certain regions of the ultraviolet rays. In this context, reference should be made to the so-called light and sun protection agents, which serve to hold back or largely attenuate the erythema-effective ultraviolet radiation (Dorno radiation), the maximum effect of which is 297 mµ and which is responsible for sunburn and reddening of the skin they let through the directly pigmented ultraviolet radiation, the maximum effect of which is around 340 mμ and which causes the skin to tan without prior reddening, largely without being weakened. Also for various other uses, e.g. B. as a light filter for chlorination of organic substances and other more you need selectively the compounds absorbing ultraviolet rays. It has now been found that butadienes disubstituted by aryl radicals or their homologues of the following formula particularly well suited for this purpose. In this formula, R and R1 denote aromatic radicals, in particular phenyl radicals, which, expediently in the p-position, are substituted by oxy groups or groups which can be converted into them, such as esters, ether groups, and optionally by alkyl radicals, in particular by methyl radicals, and X and X1 is hydrogen or alkyl radicals, in particular methyl radicals. The di- (p-oxyphenyl) -hexadienes and their acetates have proven to be particularly suitable.

Example Comparison of the absorption effect of di- (p-acetoxyphenyl) - 'hexadiene in alcoholic solution with that of some commercially available light and sun protection agents: Examined Connection Di- (p-acetoxy- phenyl) -hexadiene Complete absorption under- half about 310 mµ Connection 1 .... Complete absorption between 330 and 265 m, u as well as below 230 mµ Compound 2 No selective absorption! Weak absorption under- half 310 mµ, strong absorption tion below 225 mµ Compound 3 No selective absorption! General weakening below 450 m, u, strong Absorption below 250 mµ Compound 4 No selective absorption! Absorption is only just beginning below 230 my.

The claimed compounds are mainly used for manufacturing cosmetic preparations use. They are light stabilizers in the form of pastes, Powders or the like incorporated. But you can also add sunscreens in which they are unlike most known means which are the natural Let the rays inducing tanning pass through and essentially only the erythema absorb the rays causing them.

Other possible uses result from their filter effect The following examples serve to illustrate the invention, but without it to be limited to this.

Example 1 50 mg of di (p-acetoxyphenyl) hexadiene are dissolved in 120 g of paraffin oil solved. The solution is mixed with 100 g stearin, 35 g lanolin, 10 g ammonia (specific Weight 0.88) and 5 g of borax emulsified in 730 g of distilled water at 80 °. the The emulsion obtained is kept at this temperature for a further 20 minutes. on what stirring is continued without the supply of heat until the mass has cooled to room temperature is. Suitable odorant solutions are expediently added here. You get such a sunscreen and tanning agent that removes the erythema-producing rays of the sun absorbs, but allows the tanning rays to act on the skin unhindered.

Example 2 A quite effective make-up powder, especially for film actors suitable for long periods of time exposed to the light of strong lighting fixtures, is obtained by adding 25 g of lanolin and 100 mg of di- (p-oxyphenyl) -hexadiene in 100 g of ether dissolves and the resulting solution is thoroughly triturated with 125 g of magnesium carbonate. To remove the ether, the trituration is dried and then gradually mixed with 850 g of talc. The mixture is then rubbed in intimately until a homogeneous fat powder is obtained, which is perfumed with suitable fragrances will.

Example 3 A sun protection oil is obtained by adding 20 g of paraffin oil and 80 g of an acid-free olive oil mixed and in the mixture 3 mg of di- (p-mefhoxyphenyl) -hexadiene dissolves.

Example 4 A face tonic which at the same time has a sun protection effect exercises is obtained by adding 5 mg of di (p-propionoxyphenyl) hexadiene in 25 g of a between 65 and 75 ° boiling mineral oil, the 6 g polyoxyethylene sorbitol monostearate are added, dissolves. The mixture is then heated to 55 °. At this temperature another 4 g of polyoxyethylene sorbitol monostearate are added. In the received The solution is then gradually stirred in for 6T, 5 ccm of water heated to 60 °. It is then continued to stir without external heat supply until the facial toner is obtained is cold.

Claims (2)

PATENT CLAIMS: 1. Agent for the selective absorption of ultraviolet rays, characterized by containing compounds of the formula in which R and R1 are aromatic radicals, in particular phenyl radicals, which, expediently in the p-position, are substituted by oxy groups or groups which can be converted into them, such as esters, ether groups, and optionally by alkyl radicals, in particular by methyl radicals, and X and Xl are hydrogen or alkyl radicals , in particular methyl radicals. 2. Agent according to claim 1, characterized by a content of l) i- (p-oxyphenyl) hexadienes and their esters.