PERFUME BASES

Abstract: Perfume base, containing usnic acid and a perfumery raw material exhibiting an aromatic ring.

Description: Perfume bases Usnic acid, a natural well-known antimicrobial agent, has been demonstrated to be extremely effective against Gram-positive bacteria, fungi, and yeast with Minimum Inhibitory Concentrations as low as 10 ppm for certain species [M. Fontana, G. Proserpio, Riv. Ital. Essenze, Profumi, Piante Off., Aromi, Saponi, Cosmetici, Aerosol (RIPOAM), 1974, 56, 315-336]. The use of free usnic acid in cosmetic formulations is complicated due to its insolubility in all commonly used solvent systems [H. Bergerhausen, Cosmetics and Toiletries 1976, 91, 25-26; Manufacturing Chemist 1989, 22-27]. Soluble derivatives of usnic acid, such as its alkali and ammonium salts, as well as certain esters, have been reported [Handelsgesellschaft Schlosser GmbH, 1975, Ger. Offen.2354517. Orissa Drebing GmbH, 1975, Ger. Offen. 2351927. Orissa Drebing GmbH, 1975, Ger. Offen. 2351864. Orissa Drebing GmbH, 1976, Ger. Offen. 2432484.]. The major drawbacks of these derivatives are their insufficient stability properties, such as decolorization, pH-sensitivity, and reduction of antimicrobial activity. Usnic acid [C18H 16 O7, 2,6-Diacetyl-7 / 9-dihydroxy-8,9b-dimethyl- l,3(2H,9bH)-dibenzofurandione] exhibits the following characteristics: MW 344.32; mp 201-203°C, [α] D +488° (c 0.4, CHCI3); mp 204°C, [α] D +509.4° (c 0.697, CHCI3); Solubility at 25°C (g/100 ml): water <0.01, acetone 0.77, ethyl acetate 0.88, ethanol 0.02, chloroform 4.6, pyridine 2.12, benzene 0.94, dioxane 0.99, isopropyl alcohol 0.28, propylene glycol <0.01, dipropylene glycol 0.01, diethyl phthalate 0.45. 8097 . - 2- Certain perfumery raw materials now have been found to solubilize usnic add - and leading to stable solutions. This finding allows the direct use of usnic add, this natural antimicrobial agent isolated from alpine lichen, in numerous types of perfumes, cosmetic and toiletry formulations, without the usually required derivatization to improve its solubility. The natural and synthetic perfumery raw materials are all characterized by exhibiting an aromatic ring. In the foreground of the interest are such standard perfumery materials as: benzyl salicylate (1), benzyl benzoate (2), anisic aldehyde (3), isoeugenol methylether (4), dimamyl acetate (5), and eugenol (6). These perfumery raw materials exhibiting the desired solubilizing property are thus not only odorants, but also fixatives, blenders and modifiers. The amount of any of (1) to (6) in the perfume bases is not too critical. Convenient amounts are: about 20 to about 90% of any of (1) to (6). Mixtures of any one of (1) to (6) are also possible. The maximum solubility (g/100 ml) of pure usnic add in the above pure compounds (1) to (6) at 25°C is: benzyl salicylate 3.01, benzyl benzoate 1.93, anisic aldehyde 4.06, isoeugenol methylether 2.69, cinnamyl acetate 1.60, eugenol 2.18, anethol 4.30. Examples Three formulae of perfume compositions containing different concen¬ trations of free usnic add are listed below: Formula 1. Compound wt. % Usnic Add 0.5 1 20.0 2 18.0 6 2.0 Linalool 8.0 Benzyl Acetate 8.0 Hexyl Cinnamic Aldehyde 13.5 100.00 Formula 2. 100.00 Formula 3. Compound wt. % 100.00 Perfume compositions containing free usnic acid can thus be readily incorporated in the usual manner and using the well-known techniques into perfumed consumer products, e.g. into a wide variety of cosmetic and toiletry formulations, such as deodorants, antiperspirants, shower gels, soaps, sanitary pads, skin creams, lotions, tooth paste, mouth wash, etc. Such tooth paste may contain the usual ingredients such as abrasives, surfactants, humectants, binders, therapeutic ingredient(s), if necessary, anti tartar ingredients, preservatives, whiteners, etc. Two example formulations of applications in a deodorant stick and a deodorant non-aerosol spray are given below. Deodorant Stick: Propylene glycol 63.00% Sodium stearate 5.00% Deionized water 25.00% Hydroxyethylcellulose (Natrosol 250) 0.20% Isostearamidopropyl PG diethyl ammonium chloride (Lexquat AMG-IS) 2.00% Lauramide DEA (Standamid LD>) 4.00% Formula 1 (or 2, or 3) 0.80% 100.00% Non- Aerosol Deodorant Spray: Propylene glycol 3.00% Water 20.50% Ethanol 75.00% Formula 1 (or 2, or 3) 1.50% 100.00% Shower gel: Conventional shower gels, such as described in Cosmetic & Toiletries 104 (1989), 84 seq., in particuler 86, or in Cosmetic & Toiletries 99 (1984) 96 may contain for example 0,80 parts and 3,00 parts per weight, respectively, of Fragrance Formula 1 (or 2, or 3) 8097 - 6 Tooth paste: Caldu carbonate 50.00% Sodium lauryl sulphate 1.50% Glycerol 10.00% Sorbitol 15.00% Gum tragacanth 1.50% Sodium monofluorophosphate 0.90% Tetrasodium pyrophosphate 0.25% Zinc dtrate trihydrate 0.50% Saccharin 0.10% Formaldehyde (40%) 0.06% anethol based perfume or flavour 1.00% Water to 100.00% The usnic add in anethol is conveniently ca. 1.5 to 2.5% per weight.

Claims: Claims 1. Perfume base, containing usnic add and a perfumery raw material exhibiting an aromatic ring. 2. Perfume base according to daim 1, wherein the perfumery raw material is selected from the group consisting of benzyl salicylate, benzyl benzoate, anisic aldehyde, isoeugenol methylether, cinnamyl acetate, eugenol and anethol. 3. Perfume base according to daim 1, wherein the perfumery raw material is selected from the group consisting of benzyl salicylate, benzyl benzoate, anisic aldehyde, isoeugenol methylether, cinnamyl acetate and eugenol. 4. Perfume base according to claim 1, 2 or 3, wherein the concentration of usnic add is about 0.3% w/w to about 3% w/w, preferably about 0.5% w/w to about 2% w/w. 5. The use of a perfumery raw material exhibiting an aromatic ring, as a solubilizing agent for usnic add. 6. The use of benzyl salicylate, benzyl benzoate, anisic aldehyde, isoeugenol methylether, cinnamyl acetate, eugenol and anethol according to daim 5. 7. The use of benzyl salicylate, benzyl benzoate, anisic aldehyde, isoeugenol methylether, cinnamyl acetate and eugenol according to daim 5. ** *

Inventors: BAYDAR AHMET ENNIS, CAYLUS GHISLAINE-HENRIETTE, SELDEN CHRISTOF BASTIAN, BAYDAR, AHMET, ENNIS, CAYLUS, GHISLAINE-HENRIETTE, SELDEN, CHRISTOF, BASTIAN
Applicants: GIVAUDAN ROURE INT, GIVAUDAN-ROURE (INTERNATIONAL) S.A.
Application year: 1992
Main classification: A61K7
IPC codes: A61K8, A61Q13, A61Q15, C11B9