DE1492322A1 - Use of UV-absorbing substances as additives for cosmetics - Google Patents

Description

The predominant part of the undesirable skin reactions to cosmetics and similar preparations is based on an individual (hypersensitivity (allergy). In addition, however, skin reactions are known which can occur if the preparations contain substances with light absorption maxima above 300 nm and the preparation is exposed to in-applied state on the skin exposure to sun rays or similar light sources. Under these conditions it may be on the V / ege a Photosensibillsierung (photodynamic reaction) occur Ilautreaktionen which tion as an acute inflammation and / or Überpigrnentie- make known Such skin reactions are both

909883/1571

New documents (Art7 {1Ab & 2Nr.lSatz3desAnderun (mM.v.4.9.19i

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cpielsv / eise known as ^M 3erloque-Derrr.atitio ", but can also result in blotchy discoloration of the face (chloasma).

Although these skin reactions are relatively rare, once they have occurred they can be very difficult difficult to get rid of, so looked for courtesies must avoid such skin reactions.

2s it has now been found that by using substances which have short-wave ultraviolet in the range between 300 and 450 nr. able to absorb, as additives to cosmetics containing photosensitizing constituents in amounts of less than 10 ^c /?, based on the cosmetics, undesired skin reactions can be avoided.

Of photosensitizing substances used in cosmetics, such as perfumes, cologne, toilet waters, Lipsticks or skin care products, citrus oils, azulenes, tars or sosines may be mentioned.

Ss cosmetics are already known to which substances are mixed that the penetration of certain areas of light into the Restrict skin or prevent it entirely (DAS 1 021 541, GDR patent specification 32 279, Karl Rothemann, Das Großes recipe book der skin and body care products, 1902, 3. 64 ^ as well as Sagarin, Cosmetics Science and Technology, 1957, p. 205).

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BATH ORIGINAL

So far, the addition of UV-absorbing J ifes has been added : '. u Kosr.:etika only to either the cosmetics a to give protective measures against fire or urr. prevent the decomposition of substances contained in them, one of the cited references is the Indication to infer that it is possible to photosensitizerxle by adding uY-absorbing substances Cosmetics containing ingredients to avoid undesirable honing.

Substances that can be used as rindings, which are briefly Able to absorb ultraviolet, compounds come in Question that meet the following requirements:

1. They must be largely lightfast,

2. they must be well tolerated by the skin,

3. They should penetrate the chew as little as possible,

4. They are intended to avoid undesired conversions chemically ir.ö ™ with other components of cosmetics be indifferent, and

5. they must have the ability to absorb light, to reflect or disperse, especially in the. Range between 300 and ^ 50 nm.

On the basis of the criteria mentioned above, substances are which are used to protect human skin from sunburn (sun or light protection agents) as well as substances or mixtures that are due to their nature

909883/1571

are able to absorb, reflect or light to sprinkle, for example talc, dentonite, zinc oxide, starch, titanium dioxide or the like. Among the soluble, light-absorbing The selection of substances depends primarily on the optical properties of the photosensicilizing agent Cosmetic ingredient, as the best effect then achieved becomes when the light-filtering substance is the same or one A little longer-wave light range is maximally absorbed, like the photosensitizer.

For example, the photosensitization reaction is caused by the purocoumarins of the citrus or angelica oils (maximum absorption between 300 and 315 nm) best by substances prevents their absorption maximum between 3OO and 3 ^ 0 nm lies. Correspondingly, in the case of tars or azulenes, substances with absorption maxima between 350 and 450 nm show the most favorable Effect.

The following examples illustrate the invention.

example 1

2 g of p-aminobenzoic acid monoglycerol ester and 0.5 ^ p-isopropylcinnamic acid isopropyl ester are with 30.0 g $

CO ·· y.

_o Ethyl alcohol mixed and added to 67.5 g of citrus oil

co given toilet water.

w Example 2

- "5.0 ζ P Methylenaminobenzoesäure-polyglycol and 5.0 g of trimethoxy-dihydroxybenzophenone are mixed with 990.0 g colognes.

BAD ORDINAL Example 3

During the production of the Kölnischwaooer otifto, 0.5 % umbelliferonessis acid and 2 £ 3entonite are incorporated into the warm base mass.

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Claims (1)

Claim rr: ^ of substances that are able to absorb short-wave ultraviolet, especially the area between JOC and ^J i5C nni, al3 additives to cosmetics containing p'notoseiiöibilicierendo 3eotandteile in ϊ-'enfjen of v / enijer than 10 / I, based on the Cosmetics to avoid unwanted skin reactions. BATH ORIGINAL 909883/1571 New documents (Art 7 SI Paragraph 2 No. 1 Sau 3 de Xndwung ^ w. V. 4.9.19