MXPA99010630A - Perfume fixatives comprising polyvinylpyrrolidone and hydroxypropyl cellulose - Google Patents

Abstract

A perfume fixative comprises:(a) polyvinylpyrrolidone (PVP);(b) hydroxypropyl cellulose (HPC);and (c) hydrophobic oil. The perfume fixative is used by being incorporated in a perfume-containing formulation or product. The fixative is found to be effective in enhancing perfume life, even when the fixative is used at low levels. The efficacy even at low levels is surprising and unexpected, and the reason for this efficacy is not yet known. For practical reasons, the PVP and HPC together should not constitute more than about 0.5%by weight of the perfume-containing product. If these materials are present at higher levels they are discernible by the user, either by sight or feel, which is undesirable. However, the fixative is found to be effective in an amount corresponding to this constraint and also at lower levels. The invention also covers mixtures of perfume and fixative, mixtures of product base and fixative, and perfumed products including perfume and fixative.

Description

FIXERS FOR PERFUMES CONTAINING POLYVINYL PYROLROLONE AND CELLULOSE HYDROXYPROPIL FIELD OF THE INVENTION This invention concerns fasteners for perfumes, that is, compositions intended for use in formulations containing perfume to enhance the life of the fragrance. The words "perfume" and "fragrance" are used synonymously in this specification and no significance should be attached to the word choice "used in any particular context." The invention includes within its scope fixatives for perfumes, perfume blends and fixatives , mixtures of base product and fixative, and perfumed products including perfume and fixative.

BACKGROUND OF THE INVENTION Fragrances in some products such as perfumed products that are left on the skin, particularly (but not exclusively) those based on ethanol, for example, (deo) colognes, perfumes for personal use, antiperspirant deodorants, hair colognes, etc. , tend to lose their character quickly, that is, high / medium notes evaporate. There is a desire to extend the life of such perfumes, particularly, in retaining the initial character and intensity of the fragrance, and various fixatives for perfume have been proposed. It is an important practical consideration that the fixative should not adversely affect the aesthetic character of the product, that is, the fixer should not be noticeable by the user.

PREVIOUS TECHNIQUE Various fixing systems have been proposed including fixing oils (for example GLUC7AM P20 [GLUC7AM is a registered trademark]) or film forming polymers.

The former require the use of relatively high levels of oil to produce perceptible effects, whereas when the latter are effective, they produce highly perceptible films (both visual and tangible).

Several perfume vehicles / encapsulates have also been proposed but suffer from problems of cost and visibility in the product and / or in the skin / hair. The document of Japan JP 62114909 discloses the use of 1 to 60% by weight of polyvinylpyrrolidone (PVP) and 1 to 30% by weight of hydroxypropyl cellulose (HPC) with a fragrance material to produce a long-lasting fragrance. Such levels of PVP and HPC will be effortlessly very noticeable to the consumer.

DESCRIPTION OF THE INVENTION In one aspect, the present invention provides a fixative for perfume comprising: a) polyvinyl pyrrolidone; b) hydroxypropyl cellulose, and c) hydrophobic oil.

Polyvinylpyrrolidone is already commercially available in a variety of molecular weights. The molecular weight of PVP is not critical, but in general it is thought that the PVP of higher molecular weights gives a better yield. Good results have been obtained with the PVP LUVISKOL K90 (LUVISKOL is a registered trademark) of high molecular weight available from BASF. A mixture of different PVP can be used.

Hydroxypropyl cellulose (HPC) is also commercially available in a variety of molecular weights. HPC of higher molecular weights give better performance but also have a thickening effect, so it is preferred to use HPC of average molecular weights as a compromise between yield and product compatibility. Good results have been obtained with KLUCEL G (KLUCEL g is a registered trademark) of Aqualon. A mixture of different HPC can be used.

The hydrophobic oil should be a non-ionic oil which is liquid at the temperature of the skin (typically around 35 ° C under normal conditions).

The hydrophobic oil conveniently has an octanol / water partition coefficient (logP) greater than 3, preferably greater than 5.

The hydrophobic oil conveniently has a Hildebrand (dHILD) solubility parameter (Hildebrand, J.H. & Scott, R.L. The Solubility of Nonelectrolytes, 3rd ed. , Reinhold, New York, 1950) of less than 20 MPa1 / 2, and preferably greater than 14 MPa12.

For obvious reasons, the hydrophobic oil should be odorless, low odor, or neutral odor or harmless odor.

The hydrophobic oil should also be non-volatile, preferably having a vapor pressure of less than about 0.01 mm Hg.

The hydrophobic oil is preferably an ester and / or poly (ether) Esters are currently the most preferable materials.

Suitable hydrophobic oils include: Dicaprate / propylene glycol dicaprylate. That is to say C8, C10 diester with propylene glycol, for example as the MIGLYOL 840 (MIGLYOL is a registered trademark) of Huís. Dioctyl adipate. Isopropyl myristate Glycerol monooleate POE (10) cetyl ether POE (20) sorbitan monolaurate Dibutyl phthalate Acetyl tributyl citrate POE is an abbreviation for poly (oxyethylene) ether.

The material currently preferred is MIGLYOL 840.

A mixture of hydrophobic oils can be used.

The proportions of the res ingredients in the fixative are not critical.

Preferably, the PVP and the HPC together constitute at least 30%, more preferably at least 40%, by weight of the total weight of the fixative.

The oil preferably constitutes at least % by weight of the total weight of the fixative.

The composition typically comprises equal amounts by weight of PVP and HPC but this is not essential, and there may be cases in which it is advantageous that the amount by weight of HPC does not exceed that of the PVP.

Good results have been obtained with fixatives comprising, by weight, 25% PVP, 25% HPC and 50% hydrophobic oil.

A typical fixative formulation consists of: MIGLYOL 840 50.0% by weight non-volatile oil LUVISKOL K90 25.0% by weight PVP, high molecular weight KLUCEL G 25.0% by weight HPC, average molecular weight The perfume fixative is used by incorporation into a formulation or product containing perfume. The fixative is found to be effective in enhancing the life of the perfume, even when the fixative is used at low levels. The efficacy even at low levels is surprising and unexpected, and the reason for this efficiency is not yet known.

For practical reasons, the PVP and the HPC together should not constitute more than about 0.5%, preferably not more than about 0.25% by weight of the product containing perfume. If these materials are present at higher levels they will be perceptible by the user, either by sight or by sensation, which is undesirable. However, it is found that the fixative is effective in an amount corresponding to this restriction and also in lower levels.

For example, for a perfumed product that contains 1% by weight of perfume (which is typical in "Perfume levels in deodorants), a weight ratio of perfume: fixative of the most 2: 1 satisfies the above preferential restriction (for a fixative comprising 50% by weight of PVP and HPC), and it is found that this is more In fact, useful effects are obtained with considerably smaller amounts of fixative, for example with proportions by weight of fixative, perfume of 9: 1 or even of 19: 1, which corresponds to the combined weights of PVP. and HPC of 0.055% and 0.026% respectively (for a fixative comprising 50% by weight of PVP and HPC).

For perfumed products with higher levels of perfume, such as personal use perfume and fine fragrances which typically contain perfume in an amount in the range of 25% by weight, even higher proportions of perfume: fixative can be effective.

The most effective level of fixative depends on the nature of the perfume and the amount in which it is used, and this can be determined by experiment.

The fixative can be used with a wide variety of perfumes, although better results are obtained with perfumes that are not very essential, that is, those perfumes that require more improvement.

For its incorporation in perfumes or perfumed products, you can pre-mix the fixative with perfume and then added to the base of the product (which is all the ingredients of the product with the exception of the perfume). Alternatively, the fixative can be added to the perfumed product (ie, product base and perfume). As an additional possibility, you can add the fixative to the base of the product, and then add the perfume.

In yet another aspect, the invention thus provides perfume mixed with perfume fixative according to the invention.

The invention also encompasses a product base mixed with perfume fixative according to the invention.

Another aspect of the invention encompasses a perfumed product comprising perfume fixative according to the invention.

The invention can be applied to a wide range of perfumed products where the life of the fragrance is a consideration, including perfumed products that are left on the skin, products that include ethanol, water and silicone based, such as colognes, deo- colognes, perfumes for personal use, deodorants, antiperspirant deodorants, hair colognes, etc.

A typical deodorant has the following composition: Ethanol 80.0% by weight Water up to 100.0% by weight Fragrance 1.00% by weight Fixing mixture 0.50% by weight Triclosan 0.25% by weight The fixative conveniently contains by weight, 50% MIGLYOL 840, 25% LUVISKOL K90 and 25% KLUCEL G, as discussed above.

The invention will be further described, by way of illustration, in the following Examples.

Example 1 (Cologne) The following example illustrates the improvement in performance that a classic citrus cologne perfume can produce. The tested perfume comprises the following ingredients: Perfume of citric cologne A% in weight Nonanal 0.2 Decanal 0.4 Bencil acetate 5.0 Camphor 0.4 Cineole 0.4 Citral lemaroma 0.7 Geraniol 5.0 Hydroxicirronellal 2.0 Limonen dextro 40.0 Linalol 10.0 Linalyl acetate 16.0 Liral (IFF) 2.0 Methyl dihydro jasmonate super (Q) 2.0 Mircenil acetate 3.0 Terpinil acetate 12.9 (G) Givaudan- Roure SA (Q) Quest Three colonies were prepared by simple mixing as follows: by weight Reference Test 1 Test 2 Test 3 Cologne Citrus Perfume 2.0 2.0 2.0 2.0 Ethyl alcohol 79.6 78.8 78.8 78.8 Distilled water 18.4 18.2 18.2 18.2 LUVISKOL K90 - 0.25 0.25 0.5 KLUCEL G - 0.25 0.25 0.5 MIGLYOL 840 _ 0.50 _ _ MYVEROL 18-99 0.50 MYVEROL 18-99 8MYVEROL is a registered trademark) is primarily glycerol monooleate and is available from Quest International.

The colonies were tested by means of a paired comparison test where 50 μl of each sample was placed, using a calibrated pipette, on marked areas of a subject's forearm (one sample per arm), all of them being expert perfume appraiser. The test colonies were self-evaluated by each subject after one and four hours in relation to their reference colonies and the following average results were obtained (scale 0-5): Average of 5 Subjects Reference Test 1 Comments One hour 3.0 4.1 Noticeably stronger and fresher Four hours 2.0 2.7 Stronger, more citrus scent Average of 5 Subjects Reference Test 2 Comments One hour 3.0 3.5 High note stronger and fresher Four hours 2.0 2.8 Much stronger Average of 5 Subjects Reference * Test 3 One hour 3.0 3.5 Four hours 2.0 2.5 * Averages set for reference Example 2 (Aerosol) Test 3 shows a level of fixative: perfume of 1: 2. Test 4 shows the same fixative but at 1: 9 fixative: perfume. Exhibit 5 shows a fixative slightly changed to 1:19 fixative: perfume.

The following solutions were prepared: % by weight Reference Test 1 Test 2 Test 3 Perfume AP209 * 1.0 1.0 1.0 1.0 Ethyl alcohol 99.0 98.5 98.89 98.95 LUVISKOL K90 - 0.125 0.028 0.016 KLUCEL G - 0.125 0.028 - MIG YOL 840 - 0.25 0.056 0.032 KLUCEL E (HPC of low molecular weight) - - - 0.006 * Available from Quest These solutions were then constituted in standard aerosols using a propellant: 65:35 ratio, where the propellant was a standard propane / butane mixture. The aerosols were then tested in a manner analogous to the colonies, but using a fixed spray time of 3 seconds at a fixed distance of 15 cm from the arm.

Average of 5 Subjects Reference Test 3 Comments Initial 4, .8 4, .9 One hour 3, .6 3, .8 Four hours 2, .3 2, .9 Flat reference compared Eight hours 0, .6 1. .5 There was almost nothing left of the reference Average of 5 Suits Test Reference 4 Comments Initial 4.5 4.9 One hour 3.8 4.3 Four hours 2.5 3.3 Clear difference in power / freshness Eight hours 1.5 2.2 Still an impressive difference Average of 5 Subjects Reference Test 5 Comments Initial 5.0 4. .9 One hour 3.8 3. .8 -Four hours 1.2 2. .0 Test 5 freshest Eight hours 0.5 1, .0 Clear difference

Claims (10)

1. - Perfume fixative comprising: (a) polyvinylpyrrolidone (PVP); (b) hydroxypropyl cellulose (HPC); and (c) hydrophobic oil.

2. Perfume fixative according to claim 1, wherein the polyvinylpyrrolidone is a polyvinylpyrrolidone of high molecular weight.

3. Perfume fixative according to claim 1 or 2, wherein the hydroxypropyl cellulose is a hydroxypropyl cellulose of average molecular weight.

4. Perfume fixative according to claim 1, 2 or 3, wherein the hydrophobic oil is an ester and / or poly (ether), preferably an ester.

5. Perfume fixative according to claim 4, wherein the hydrophobic oil comprises one or more of the following selected: Dicaprate / propylene glycol dicaprylate Dioctyl adipate Isopropyl myristate Mono glycolate glycerol POE (10) cetyl ether POE (20) ) sorbitan monolaurate Dibutyl phthalate Acetyl tributyl citrate 6.- Perfume fixative according to any of the preceding claims, the polyvinylpyrrolidone and the hydroxypropyl cellulose together constitute at least 30%, preferably 40%, by weight of the total weight of the fixative. 7. Perfume mixed with a perfume fixative according to any of the preceding claims. 8. Product base mixed with perfume fixative according to any of the preceding claims. 9. Scented product comprising perfume fixative according to any of the preceding claims. 10. Scented product according to claim 9, wherein the polyvinylpyrrolidone and the hydroxypropyl cellulose in the fixative together constitute no more than about 0.5%, preferably not more than about 0.25% by weight of the total weight of the perfumed product.