EP2229139A1

EP2229139A1 - Aqueous emulsion containing a cyclodextrin derivative, a perfume, and a polysorbate

Info

Publication number: EP2229139A1
Application number: EP09701854A
Authority: EP
Inventors: Maria-Elisabeth Regiert; Michaela Kupka; Harald Sigl
Original assignee: Wacker Chemie AG
Current assignee: Wacker Chemie AG
Priority date: 2008-01-17
Filing date: 2009-01-09
Publication date: 2010-09-22
Also published as: DE102008000084A1; JP2011514310A; US20100280133A1; WO2009090140A1

Abstract

Disclosed is an aqueous emulsion containing a cyclodextrin derivative, a hydrophobic perfume, and a polysorbate. Said aqueous emulsion is characterized in that the same contains 6 to 35 percent by weight, preferably 10 to 20 percent by weight, of the cyclodextrin derivative, 3 to 20 percent by weight, preferably 6 to 12 percent by weight, of the hydrophobic perfume, and 4 to 20 percent by weight, preferably 6 to 12 percent by weight, of the polysorbate, as well as water.

Description

An aqueous emulsion containing a cyclodextrin derivative, a fragrance and a polysorbate

The invention relates to an emulsion containing a cyclodextrin derivative, a fragrance and a polysorbate, and to processes for preparing this emulsion and their use.

Cyclodextrin derivatives are chemically modified cyclodextrins. Cyclodextrins are cyclic oligosaccharides composed of 6,7 or 8 OC (1-4) linked anhydroglucose units. The CC-, β- or γ-cyclodextrins produced by enzymatic conversion of starch differ in the diameter of their hydrophobic cavity and are suitable for the inclusion of numerous lipophilic substances. Cyclodextrin derivatives have a significantly higher water solubility than the corresponding unmodified cyclodextrin. Cyclodextrin derivatives can be used to modify the properties of other compounds, for example, to increase the water solubility of oil-soluble substances in water.

Fragrances are all natural and synthetic substances that have a smell. They are often volatile and inconsistent with oxidizing agents. Already in the air and in the light the behavior of these products changes in many ways. Examples of low-odor fragrances, ie substances with a high boiling point, are benzophenone, benzyl salicylate, galaxolides, derivatives of cinnamic aldehyde, or phenylethyl phenyl acetate. Examples of volatile odorants are cinnamyl alcohol, coumarin, derivatives of salicylic acid, phenolic fragrances such as vanillin or eugenol and cedryl derivatives. Examples of highly volatile fragrances are aldehydes, alcohols and esters of terpenes such as citral, linalool or geranyl acetate. Fragrances are also essential oils such as tea tree oil, citrus oils (lemon and orange oil), oils of herbs (rosemary, thyme, oregano oil), oils of woods (rosewood oil, cedar wood oil) cinnamon aldehyde ** or cinnamon bark oil, eugenol ** or clove flower oil , 4-terpineol, terpinene ** or Tea tree oil *, thymol ** or thyme oil "lypthusöl, camphor ** or camphor oil, geraniol ** or palmarosa, citronella and geranium oil *, Cedrol **, cedar wood oil * The substances marked with ** are active and mostly Main components of the mentioned essential oils marked with * These oils may have an antimicrobial, fungicidal and, due to their odor, insect repellent action based on the effect of individual components.

Fragrances are generally lipophilic and therefore form separate phases even when small quantities are added to an aqueous phase, which limits the desired broad use of fragrances in purely aqueous preparations such as coating agents. It has therefore already been attempted to increase the water solubility of the fragrances by complexing with cyclodextrins or cyclodextrin derivatives.

EP 1 002 549 A1 discloses in this respect a clear aqueous formulation which contains 0.01-1% by weight of a perfume in an aqueous cyclodextrin solution containing 0.1-5% by weight of a cyclodextrin.

WO 96/04938 describes a clear aqueous composition for odor reduction comprising 0.01-1% by weight of a perfume in one and up to 5% by weight of water-soluble cyclodextrins.

Such products are used for the coating of surfaces as in o.g. Fonts disclosed, used.

The prior art thus describes stable compositions containing up to 1% by weight of perfume in a clear aqueous cyclodextrin preparation. Upon further addition of perfume to the clear aqueous cyclodextrin preparation, it is not stable, ie two phases are formed within minutes. Such unstable aqueous Cyclodextrinzubereitung with lipophilic, ie oil-soluble fragrances are unsuitable for the occupancy of surfaces. The object of the invention was to provide a stable, aqueous, cyclodextrin preparation which contains larger amounts of hydrophobic fragrances than the preparations of the prior art.

This object is achieved by an aqueous emulsion containing a cyclodextrin derivative, a hydrophobic perfume and a polysorbate characterized in that it contains the cyclodextrin derivative in an amount of 6% to 35 wt.%, Preferably 10 to 20 wt.% And the hydrophobic Fragrance in an amount of 3 to 20% by weight, preferably 6 to 12 wt.% Contains and the polysorbate in an amount of 4% to 20 wt.%, Preferably 6% to 12 wt.% And water.

The hydrophobic perfume is preferably a perfume, particularly preferably a hydrophobic perfume which has an antimicrobial, fungicidal or insect-repellent effect due to its odor.

The cyclodextrin derivative is preferably a derivative of CC-, β- or γ-cyclodextrin, more preferably it is methyl-beta-cyclodextrin (M-beta-CD) or hydroxypropyl-beta-cyclodextrin (HP-beta). CD).

The polysorbate is preferably polyoxyethylene (20) sorbitan mono-oleate (polysorbate 80) commercially available under the name Tween® 680 from Lonza Basel, Switzerland, polyoxyethylene sorbitan tristearate (polysorbate 65), commercially available from US Pat Tween® 65 at Lonza Basel, Switzerland or polyoxyethylene (20) sorbitan monolaurate (Polysorbate 20), commercially available under the name Tween® 20 from Lonza Basel, Switzerland.

In particular, it is preferably Tween® 20 (polyoxyethylene (20) sorbitan monolaurate).

In particular, the emulsion preferably contains, in addition to water, from 6% to 35% by weight of methyl-beta-cyclodextrin, or hydroxypropyl Beta-cyclodextrin 3 to 20% by weight of a fragrance and 4 to 20% by weight of polyoxyethylene (20) sorbitan monolaurate.

For the purposes of the present invention, stable is understood to mean that the emulsion shows no phase separation over a period of at least 2 weeks, preferably more than 20 weeks.

The emulsion according to the invention is more effective than the ones described in the prior art. The release of the

The guest substance of the fragrance, for example, is sensory (odor strength 0-15) as well as analytic (more pronounced via solid phase microextraction / SPME analysis).

The emulsion according to the invention can be prepared in a manner known per se. This can be done, for example, by a mixture of 6% to 35% by weight, preferably 10 to 20% by weight, of cyclodextrin derivative and 3 to 20% by weight, preferably 6 to 12% by weight of hydrophobic perfume and 4% to 20% by weight. , Preferably 6% to 12 wt.% Polysorbate is processed in water to a stable emulsion. The mixture of the components mentioned is stirred intensively.

The invention thus also relates to a process for preparing an emulsion which is characterized in that a mixture of 6% to 35% by weight, preferably 10 to 20% by weight, of cyclodextrin or cyclodextrin derivative and 3 to 20% by weight, preferably 6 to 12% by weight of hydrophobic perfume and 4% to 20% by weight, preferably 6% to 12% by weight, of polysorbate in water to form a stable emulsion.

The emulsion according to the invention is particularly suitable for coating surfaces, since the emulsion according to the invention distributes itself extremely uniformly on arbitrary surfaces and penetrates only moderately. The coating of the surfaces with the emulsion according to the invention takes place without streaks and staining. A double coating is carried out in most cases, the coated surfaces are more uniform than surfaces coated with clear aqueous cyclodextrin preparations. There are no colored edges.

The emulsion of the invention can be applied directly to the surface to be coated, but it can initially be incorporated into a coating agent. The coating agents may be a color, e.g. to trade a wall color. Preferably, the emulsion is incorporated in an amount of 0.1 to 90% by weight in the coating agent.

The invention thus also relates to a coating composition comprising an emulsion according to the invention.

The surfaces to be coated are, for example, mineral or organic surfaces. Examples of mineral surfaces are stone, concrete or building materials. Examples of organic surfaces are lifeless organic surfaces such as textiles / nonwoven, wood, paper or leather) but also living organic surfaces such as skin or hair.

The coating of the surfaces is carried out by applying the emulsion according to the invention or the coating agent according to the invention and optionally drying the surface.

A surface coated with an emulsion according to the invention has several advantages: In the case of lifeless organic surfaces such as nonwovens or textiles, the nature ("feel") of the material is not changed In contrast, loading the surface with a clear aqueous cyclodextrin preparation without addition of polysorbate at the same active ingredient concentration of the fragrance to a rigidity of the occupied tissue whose wearing property is described as sticky. The invention thus also relates to surfaces which are characterized in that they have been coated with an emulsion according to the invention or a coating composition according to the invention.

Fig. 1 shows the maximum content of each fragrance in a stable aqueous emulsion according to the invention in comparison to the maximum content in a stable aqueous solution of the corresponding cyclodextrin derivative (M-beta CD). The preparation of the respective compositions is described in Examples 1 to 7

FIG. 2 shows the maximum content of the respectively named perfume in a stable aqueous emulsion according to the invention in comparison with the maximum content in a stable aqueous solution of the corresponding cyclodextrin derivative (HP-beta CD). The preparation of the respective compositions is described in Examples 8 to 10.

Fig. 3 shows the release of thymol from a piece of nonwoven fabric as described in ex. 11.

Fig. 4 shows the release of eugenol from a piece of nonwoven fabric as described in Ex.

Fig. 5 shows the release of thymol from a piece of nonwoven fabric as described in Ex. 11.

Fig. 6 shows the release of eugenol from a piece of nonwoven fabric as described in Ex.

Fig. 7 shows the release of geraniol from a piece of nonwoven fabric as described in Ex. 13.

The following examples serve to further explain the

Invention. The examples in each case describe the preparation of a stable aqueous emulsion containing the particular perfume mentioned. Further, the maximum amount becomes Perfume in which a stable emulsion is still obtained, described a) and optionally c) describes the prior art and b) the composition of the invention.

Example Ia:

In 34.6 g of a 10% (w / w) aqueous solution of methyl-beta-cyclodextrin, 0.4 g of cinnamaldehyde or cinnamon bark oil are dissolved by stirring.

Example Ib:

In 26.6 g of a 10% aqueous solution of methyl-beta-cyclodextrin are 4.2 emulsified Tween 20® and 4.2 g of cinnamaldehyde or cinnamon bark oil by stirring. (15.7%)

Example 2a:

In 34.78 g of a 10% aqueous solution of methyl-beta-

Cyclodextrin 0.22g tea tree oil are dissolved by stirring.

Example 2b:

In 24.5 g of a 10% aqueous solution of methyl-beta-cyclodextrin, 5.25 g of Tween 20® and 5.25 g of tea tree oil are emulsified by stirring.

Example 3a:

In 34.58 g of a 10% aqueous solution of methyl-beta-

Cyclodextrin is dissolved by stirring 0.42 g of thymol.

Example 3b:

In 29.4 g of a 10% aqueous solution of methyl-beta-cyclodextrin, 2.8 g of Tween 20 and 2.8 g of thymol are emulsified by stirring.

Example 3c:

In 2.8 g of Tween 20®, 2.8 g of thymol are emulsified by stirring. Example 4a:

In 34.804 g of a 10% aqueous solution of methyl-beta-

Cyclodextrin, 0.196g thyme red oil are dissolved by stirring.

Example 4b:

In 47 g of a 10% aqueous solution of methyl-beta-cyclodextrin, 1.5 g of Tween 20® and 1.5 g of thyme red oil are emulsified by stirring.

Example 5a:

In 34.51 g of a 10% aqueous solution of methyl-beta-

Cyclodextrin 0.49g eugenol are dissolved by stirring.

Example 5b:

In 30.0 g of a 10% aqueous solution of methyl-beta-cyclodextrin, 2.45 g of Tween 20® and 2.45 g of eugenol are emulsified by stirring.

Example 5c:

In 2.8 g of Tween 20®, 2.8 g of eugenol are homogenized by stirring.

Example 6a: In 34.7 g of a 10% aqueous solution of methyl-beta-cyclodextrin, 0.3 g of Fragrance N are dissolved by stirring.

Example 6b:

In 30.8 g of a 10% aqueous solution of methyl-beta-cyclodextrin, 2.1 g of Tween 20® and 2.1 g of Fragrance N are emulsified by stirring.

Example 7a:

In 34.7 g of a 10% aqueous solution of methyl-beta-cyclodextrin, 0.28 g geraniol are dissolved by stirring. Example 7b:

In 22.3 g of a 10% aqueous solution of methyl-beta-cyclodextrin, 2.8 g of Tween 20® and 2.8 g of geraniol are emulsified by stirring.

Example 7c:

In 2.8 g of Tween 20®, 2.8 g of geraniol are homogenized by stirring.

Example 7d (according to the invention)

In 30.8 g of a 10% aqueous solution of methyl-beta-cyclodextrin, 0.28 g of Tween 20® and 0.28 g of geraniol are homogenized by stirring.

Example 8a:

In 99.5 g of a 10% aqueous solution of hydroxypropyl-beta-cyclodextrin, 0.5 g of tea tree oil is dissolved by stirring.

Example 8b:

In 70 g of a 10% aqueous solution of hydroxypropyl-beta-cyclodextrin, 15 g of tea tree oil and 15 g of Tween20 are emulsified by stirring.

Example 9a:

In 99.5 g of a 10% aqueous solution of hydroxypropyl-beta-cyclodextrin 0.5 g of geraniol are homogenized by stirring.

Example 9b:

In 90 g of a 10% aqueous solution of hydroxypropyl-beta-cyclodextrin, 5 g of geraniol and 5 g of Tween20® are emulsified by stirring. I 1 0 a:

In 99.75 g of a 10% aqueous solution of hydroxypropyl-beta-cyclodextrin, 0.25 g of geranium oil is dissolved by stirring

Example 10b:

In 98 g of a 10% aqueous solution of hydroxypropylbeta

Cyclodextrin is emulsified Ig geranium oil and Ig Tween20®.

In the following examples, the coating on nonwoven fabric (non woven fabric) with a stable emulsion and a stable aqueous solution with the maximum amount of perfume containing the particular perfume is described in each case. a) and c) each describe the prior art and b) the coating with a composition according to the invention.

Example 11

On a 10 cm × 10 cm piece of nonwoven fabric (weight 5 g), 10 g of the stable solution of Ex. 3a or 10 g of the stable aqueous emulsions from Example 3b are applied by spraying. These nonwoven fabric samples are dried and stored at room temperature. The analytical content determination of the guest is done by SPME analysis. For the SPME analysis, each 180 mg of occupied nonwoven fabric is measured after 0, 3, 7 and 30 days. 3 shows the volatiles in the gas space.

EXAMPLE 12 On a 10 cm × 10 cm piece of nonwoven fabric (weight 5 g), 10 g of the stable solution of Ex. 5a or 10 g of the stable aqueous emulsions from Ex. 5b are applied by spraying. These nonwoven fabric samples are dried and stored at room temperature. The analytical content determination of the guest is done by SPME analysis.

For the SPME analysis, each 180 mg of occupied nonwoven fabric is measured after 0, 3, 7 and 30 days. 4 shows the volatiles in the gas space. The sensory determination of the odor strength of the nonwoven fabric samples prepared in Example 11 and Example 12 takes place at the beginning, after 3, 4, 7 and 9 weeks of storage in daylight and room temperature. The results are shown for Example 11 in Figure 5 and for Example 12 in Figure 6.

The following example describes the coating of a wall with a solvent-free inner wall paint on water containing a stable emulsion according to the invention or a stable aqueous solution with the maximum amount of fragrance (prior art). The emulsion according to the invention or the stable aqueous solution contain the particular fragrance in each case maximum amount, which still allows a stable emulsion / solution.

Example 13 18g of solvent-free interior wall paint based on water are homogenized with 2 g of a stable emulsion according to Example 7b or with 2 g of a stable aqueous solution according to Example 7a or 7 d). On a 20cm x 10cm piece of polyethylene (PE) film, 5g each of these solvent-free interior wall paints are applied, dried and exposed to daylight

Stored at room temperature. The analytical content determination of the guest is done by SPME analysis.

For the SPME analysis, 500 mg of the wall paint are removed from the film and measured after 0, 5, 30 days. FIG. 7 shows the volatiles in the gas space after the addition of 100 mg of water.

Example 14

Preparation of a gel for acne treatment of the skin: 88 g of an aqueous hydroxypropyl-beta-emulsion

Cyclodextrin / TWEEN 20® / TEA TREE OIL (5% tea tree oil in water) is mixed with 7g Wacker Belsil PDM 20® 2g alpha-cyclodextrin linoleic acid complex, 2g beta-cyclodextrin-d-alpha-tocopherol Complex and Ig Carbopol Ultrez 10 and stirred at room temperature for 30 minutes. Subsequently, the formulation is neutralized with NaOH to a pH of 6-7, forming a gel.

Example 15

Preparation of a gel with a repellent effect on the skin:

91.9 g of an emulsion of aqueous hydroxypropyl-beta-cyclodextrin / TWEEN 20® / with 5% by weight of geraniol is mixed with 7 g of Wacker Belsil PDM 20®, Ig Carbopol® Ultrez 10 (polyacrylic acid) and 0.1 g of Kathon® CG (mixture of fungicides, Bactericides and algicides based on 5-chloro-2-methyl, 2-methyl or 2-octylisothiazol-3-one) and stirred at room temperature for 30 minutes. Subsequently, the formulation is neutralized with NaOH to a pH of 6-7, forming a gel.

Claims

claims

1. Aqueous emulsion containing a cyclodextrin derivative, a hydrophobic perfume and a polysorbate characterized in that the cyclodextrin derivative in an amount of 6% to 35 wt.%, Preferably 10 to 20 wt.% And the hydrophobic perfume in an amount of From 3 to 20% by weight, preferably from 6 to 12% by weight, and containing the polysorbate in an amount of from 4% to 20% by weight, preferably from 6% to 12% by weight, and water.

2. Emulsion according to claim 1, characterized in that it is a perfume in the hydrophobic perfume.

3. Emulsion according to claim 1 or 2, characterized in that the hydrophobic fragrance has an antimicrobial, fungicidal or odor-repellent effect by its odor.

4. Emulsion according to claim 1, 2 or 3, characterized in that the cyclodextrin derivative is selected from the group of methyl and hydroxypropyl beta-cyclodextrin.

5. An emulsion according to any one of claims 1 to 4, characterized in that the polysorbate is selected from the group polyoxyethylene (20) sorbitan mono-oleate, polyoxyethylene sorbitan tristearate and polyoxyethylene (20) - sorbitan monolaurate.

6. An emulsion according to any one of claims 1 to 5, characterized in that in addition to water 6 to 35 wt.% Myl- methyl-beta-cyclodextrin, 3 to 20 wt.% Of a fragrance and 4 to 20 wt.% Of polyoxyethylene (20 ) sorbitan monolaurate.

7. Process for the preparation of an emulsion according to one of claims 1 to 6, characterized in that a from 6% to 35% by weight, preferably from 10 to 20% by weight, of cyclodextrin derivative and from 3 to 20% by weight, preferably from 6 to 12% by weight, of hydrophobic perfume and from 4% to 20% by weight, preferably from 6% to 12% by weight. % Polysorbate in water is processed by stirring to a stable emulsion.

8. Coating composition comprising an emulsion according to any one of claims 1 to 6.

Surface characterized in that it is coated with an emulsion according to any one of claims 1 to 6 or a coating agent according to claim 8.