EP1926853A1

EP1926853A1 - Aqueous microcapsule dispersions

Info

Publication number: EP1926853A1
Application number: EP06792020A
Authority: EP
Inventors: Jürgen FALKOWSKI; Raymond Mathis; Robert Schütz
Original assignee: Cognis IP Management GmbH
Current assignee: Cognis IP Management GmbH
Priority date: 2005-09-22
Filing date: 2006-09-13
Publication date: 2008-06-04
Also published as: WO2007033785A1; DE102005045138A1; JP2009510188A; US20080224086A1; BRPI0615760A2

Abstract

Proposed are aqueous microcapsule dispersions comprising (a) water, (b) microcapsules loaded with one or more ingredients or active compounds, and (c) polymeric dispersants, these polymers being either homopolymers or copolymers and being composed of at least 5 monomer units. These aqueous microcapsule dispersions are especially suitable for imparting microcapsules to textiles of any kind.

Description

"Aqueous microcapsule dispersions"

Field of the invention

The invention relates to aqueous microcapsule dispersions for finishing textiles.

State of the art

For the finishing of textiles, microcapsules with different ingredients are increasingly being used. The task of the microcapsules is a delayed release of active substance taking place on the surface of the textile in order, for example, to achieve cosmetic effects on the skin.

The preparation of the microcapsules with the appropriate ingredients can be done by different techniques. A summary of these techniques can be found, for example, in the following reference: K. Lacasse, W. Baumann; Textile Chemicals, Table 6-22, Berlin 2004. The microcapsules prepared by these techniques usually have a diameter of 1-10 μm. When applying microcapsules to textiles, only limited amounts of capsules can be applied, since otherwise the surface properties of the textile fabrics are excessively impaired. Thus, therefore, only a limited volume of active ingredients can be applied via microcapsules.

In addition, the amount of microcapsules present on the surface of textiles is reduced by washing, which, logically, also decreases the amount of active ingredient released when the fabrics are worn, which is subjectively experienced as a loss of effect. For this reason, it is advisable to load the textiles with microcapsules after a few washing and wearing procedures. Description of the invention

It is an object of the present invention to provide microcapsules, which are usually obtained in aqueous solution as a result of the preparation, in a form suitable for both the original equipment manufacturer and the end user.

A further object of the present invention was therefore to provide storage-stable aqueous microcapsule dispersions. The requirement of storage stability has two essential aspects:

• Microcapsules typically contain organic ingredients whose density is less than the density of the water in the continuous phase of the dispersion. This requires that the capsules in the dispersion tend to accumulate on the surface and also to agglomerate there. This considerably complicates the further processing of the capsules. Both in the original equipment of the textiles in industrial processes as well as in the recharging at the end user, it is therefore important to apply the microcapsules from a stable and preferably monomer dispersed dispersion.

According to the Applicant's investigations, the selection of suitable additives which are suitable for effecting dispersion of microcapsules b) is not trivial. If, for example, typical surface-active dispersants, such as adducts of alkylene oxides with alcohols, for example fatty alcohol ethoxylates, are used, damage or softening of the polymer shell of the microcapsules b) occurs. This can even lead to leakage of the ingredients from the capsules during storage.

Surprisingly, it has now been found that long-lasting aqueous microcapsule dispersions can be prepared by the use of certain dispersants c).

The invention relates to aqueous microcapsule dispersions comprising a) water, b) microcapsules which are loaded with one or more ingredients or active substances, and c) polymeric dispersants, which polymers may be homo- or copolymers and wherein these polymers are composed of at least 5 monomer units.

The dispersions of the invention solve the above tasks in an excellent manner. In particular, it should be emphasized:

• The dispersions have a long-term storage stability.

The polymeric capsule shell of the microcapsules is not damaged or softened by the compounds c).

• The Aufziehverhalten the microcapsules on textiles is not affected by the compounds c), just as it comes to the application of the microcapsules on the textiles not to deposits on the rollers.

• The dispersions can be used both in industrial processes (coating process, padding process), as well as the end user (reloading of textiles after washing, for example).

In one embodiment, the microcapsule dispersions according to the invention are additionally admixed with viscosity regulators d), the compounds d) having to be different chemically from the compounds c).

Another object of the invention are therefore microcapsule dispersions containing a) water, b) microcapsules which are loaded with one or more ingredients or active ingredients, c) polymeric dispersants, which polymers may be homopolymers or copolymers and wherein these polymers are composed of at least 5 monomer building blocks and d) viscosity regulators, with the proviso that the compounds d) must be chemically different from the compounds c).

If desired, the microcapsule dispersions according to the invention may also contain other additives which are usually used in the finishing of textiles.

To the microcapsules b)

In the context of the present invention, microcapsules are understood in principle to mean organic polymers having a specific spatial structure (cf., for this, K. Lacasse and W. Baumann, Textile Chemicals, Environmental Data and Facts, Berlin 2004, pages 468-482). With regard to the spatial structure, it is true that they are hollow bodies which typically have a diameter in the range of 2 to 2000 μm and an outer diameter in the range of 0.1 to 200 μm and in particular 0.5 to 150 μm. Due to this hollow body structure, the microcapsules may be loaded with ingredients or active ingredients.

In the context of the present invention always loaded microcapsules are used, that is microcapsules which are loaded with one or more ingredients or active ingredients. In principle, substances which can be applied to the skin when the textile is loaded with the loaded microcapsules (which is achieved by bringing the textile into contact with the microcapsule dispersions according to the invention) are used as ingredients or active ingredients. These may be, for example, fats, oils, plant extracts, vitamins, fragrances, repellants, insecticides and the like. In the oils, vegetable oils with skin-care and health-promoting properties are preferred, such as coconut oil, passion flower oil, shea butter, rose hip seed oil, lavender oil, apricot kernel oil. In the plant extracts rhodysterol and aloe vera are preferred.

Of particular importance in the manufacture of the present invention are Wirkbzw. Ingredients that have the following properties: skin conditioning, moisturizing Donating, stimulating, soothing, cellulite-reducing, skin-tightening, repellent, refreshing, stimulating.

The encapsulated substances, also referred to below as core material, may consist of any solid, liquid or gaseous materials which are to be incorporated in encapsulated form into corresponding products. Preferably, the core materials used are fragrances, such as perfume oils, or substances which have a nourishing effect in the particular field of use.

As perfume oils or fragrances, individual perfume compounds, for example the synthetic products of the ester type, ethers, aldehydes, ketones, alcohols and hydrocarbons can be used. Fragrance compounds of the ester type are, for example, benzyl acetate, phenoxyethyl isobutyrate, p-tert-butylcyclohexyl acetate, linalyl acetate, dimethylbenzylcarbinyl acetate, phenylethyl acetate, linalyl benzoate, benzyl formate, ethyfmethylphenylglycinate, allylcyclohexylpropionate, styrallyl propionate and benzylsaturate. The ethers include, for example, benzyl ethyl ether, to the aldehydes, for example, the linear alkanals having 8-18 C atoms. Citral (geranial), citronellal, citronellyloxyacetaldehyde, cyclamen aldehyde, hydroxycitronellal, lilial and bourgeonal. Among the ketones, for example, the Jonone, α-isomethylionone and methyl cedrylketone to the alcohols anethole, citronellol, eugenol, geraniol, linalool, phenylethyl alcohol and terpineol, the hydrocarbons include mainly the terpenes such as limonene and α-pinene. Eucalyptol (1,8-cineole) can also be used as the fragrance. Preferably, however, mixtures of different fragrances are used, which together produce an attractive fragrance. Such perfume oils may also contain natural fragrance mixtures as are available from vegetable sources, eg pine, citrus, jasmine, patchouly, rose or ylang-ylang oil. Also suitable are clary sage oil, chamomile oil, clove oil, lemon balm oil, mint oil, eucalyptus oil, cinnamon leaf oil, lime blossom oil, juniper berry oil, vetiver oil, olibanum oil, galbanum oil and labdanum oil, as well as orange blossom oil, neroliol, orange peel oil and Sandelhotz oil. In addition, as fragrances nitriles, sulfides, oximes. Acetals, ketals, acids, Schiff bases, heterocyclic nitrogen compounds such as indole and quinoline, pyrazines, amines such as anthanilates, amides, halogenated organic compounds such as rosin acetate, nitrated compounds such as nitro musk, heterocyclic sulfur compounds such as thiazoles, and heterocyclic oxygen compounds such as epoxides, all of which are known to those skilled in the art as possible fragrances. Examples of nourishing components are vitamins and provitamins, such as vitamin A, vitamin C, vitamin E (α-tocopherol), vitamin F (polyene fatty acids), panthenol (provitamin B5), beta carotene (provitamin A) and their derivatives (eg Esters, such as stearyl ascorbate), plant extracts, biopolymers, antidandruff agents, UV protectants, emollients (cosmetic oils), silicone oils.

In the case of cosmetic applications, tocopherols and their lipid-soluble derivatives are preferred as caring components. Suitable tocopherols are e.g. the natural tocopherols and their mixtures as well as synthetic tocopherols. Suitable derivatives are e.g. Tocopheryl acetate, tocopheryl nicotinate, tocopheryl ascorbate, tocopheryl retinoate, tocopheryl succinate, tocopheryl linoleate or tocopheryl benzoate.

To the compounds c)

As already stated, the compounds c) are polymeric dispersants, ie compounds which are to be regarded as structurally polymers and which have a dispersing and / or emulsifying effect with regard to the microcapsules b). The polymers c) may be homopolymers or copolymers. They must be composed of at least 5 monomer building blocks.

In a preferred embodiment, homopolymers are used as compounds c).

In a further preferred embodiment, the compounds c) used are polymers c) having molecular weights of at least 500.

The monomer building blocks, which are based on the polymeric dispersants c), may be derived from natural raw material sources or of synthetic origin. Example of Polymeric Dispersants c) whose monomer units are of natural origin are, for example, polymers based on cellulose (eg sodium). Carboxymethylcellulose) or polysaccharides (eg xanthan gum, gellan gum, guar or pectins)

Examples of polymeric dispersants c) whose monomer units are of synthetic origin are, for example, acrylates (for example Na polyacrylates), methacrylates or alkyl acrylates (for example pemulen).

If desired, the monomer building blocks from which the dispersants c) are constructed may also be chemically modified.

In a very particularly preferred embodiment, the polymeric dispersants c) used are compounds selected from the group consisting of xanthan gum, gellan gum, guar and polyacrylates. These dispersants can be used individually or mixed with one another.

To the viscosity regulator end d)

The viscosity regulators d) may be, for example, organic or inorganic salts. For example, alkali or alkaline earth salts, such as sodium chloride or magnesium chloride can be used. Suitable organic salts are, for example, urea, urea derivatives or amino acids. In addition, the use of surface-active compounds, e.g. Alkali soaps of long-chain carboxylic acids, alkali metal salts of sulfonic acids, alkali metal salts of alcohol sulfates or alcohol ether sulfates possible, such as Na-cumene sulfonate, Na-lauryl sulfate or Na-lauryl ether sulfate.

To the micro capsule dispersions

The microcapsule dispersion according to the invention preferably have a concentration of capsules of 1 to 50% by weight. Preferably, the concentration of microcapsules is in the range of 1 to 20% by weight. The% data in each case mean:% by weight of microcapsules b) based on the total dispersion. The microcapsules may have a diameter of 0.1 to 200 microns, with the preferred range is 1 to 20 microns.

The preparation of the microcapsules loaded with one or more active substances and / or active substances can be carried out by all methods known to those skilled in the art. A compilation of corresponding techniques can be found, for example, in the following reference: K. Lacasse, W. Baumann; Textile Chemicals, Table 6-22, Berlin 2004.

The amount of the polymeric dispersants c) to be used in the aqueous microcapsule dispersions according to the invention is not subject to any particular limitations. Preferably, however, they are used in amounts of from 0.05 to 2% by weight, and in particular from 0.1 to 1% by weight. The% data in each case mean:% by weight of dispersants c) based on the total dispersion.

The polymeric Disperatoren c) can directly b in an aqueous dispersion of the microcapsules) were charged and are dissolved therein, where applicable, the temperature is increased somewhat, is preferably carried out in the range of 20 to 80 ⁰ C. A use of dispersing machines, such as Zahndispergiermaschinen or high pressure homogenizers may be desired but are generally not necessary. It is preferably avoided in order to prevent unwanted damage to the microcapsules before or during application to the textile, which could also lead to an undesirable, premature release of the active ingredients contained.

Another subject of the invention is the use of said aqueous microcapsule dispersions for finishing textiles of any kind with microcapsules.

A further subject of the invention is a process for finishing textiles with microcapsules, wherein the textiles are brought into contact with the abovementioned aqueous microcapsule dispersions. Examples

Substances used

Dispersants c):

• Cosmedia Guar: cationized Guar (Cognis)

• Keltrol F: Xanthan gum (Kelco)

Cosmedia SP: polyacrylate (Cognis)

example 1

955 g of an aqueous microcapsule dispersion containing 40% by weight of about 2-5 μm large microcapsules with nourishing, oil-containing ingredients tended to segregate due to the density of the oils contained (coconut oil, for example), ie the capsules were agglomerated from the surface. This dispersion was heated to 60 ⁰ C and were g as polymeric dispersants portionwise 2.5 Cosmedia Guar and 2.5 g Keltrol F were added and intensive stirring until all parts of the polymeric dispersants had dissolved. To adjust the viscosity, 40 g of magnesium chloride hexahydrate were then added. The product was then cooled with stirring to 20 ⁰ C. The viscosity of the microcapsule dispersion thus prepared was 1280 mPas (Brookfield, 25 ^° C., spindle 31, 50 rpm). After 6 months of storage, no segregation was observed. The viscosity remained almost constant at 1350 mPas.

Example 2

998 g of an aqueous microcapsule dispersion containing 40% by weight of approximately 2-5 μm microcapsules with mosquito-repellent ingredients were stirred into 668 g of demineralized water. Due to the density of the organic components contained in the microcapsules (including N, N-diethyl-m-toluamide), the dispersion tended to segregate, ie the capsules swam. This dispersion was at 60 ⁰ C. were heated and it was added as a polymeric dispersant 2.0 g Cosmedia SP and stirred thoroughly until all the contents of dispersant had dissolved. It was then cooled. The viscosity of the microcapsule dispersion thus prepared was 23 mPas (Brookfϊeld, 25 ⁰ C, spindle 21, 100 rpm). After 6 months of storage, no segregation was observed. The viscosity remained unchanged, the dispersion remained homogeneous.

Example 3

994 g of an aqueous microcapsule dispersion containing 40% by weight of approximately 2-5 μm microcapsules with ingredients for cellulite was stirred into 894 g of demineralized water. Due to the density of the active substances contained (including shea butter, apricot kernel oil and rosehip oil), the capsule dispersion tended to segregate, ie the capsules swam up. This capsule dispersion was heated to 60 ⁰ C and there was added in portions 6.0 g Cosmedia® SP had added and intensive stirring until all parts of polymeric dispersant solved. It was then cooled. The viscosity of the microcapsule dispersion thus prepared was 420 mPas (Brookfield, 25 ⁰ C, spindle 31, 50 rpm). After 6 months of storage, the viscosity was 450 mPas. The dispersion remained homogeneous.

Claims

claims

1. aqueous microcapsule dispersions containing a) water, b) microcapsules, which are loaded with one or more ingredients or active ingredients, and c) polymeric dispersants, which polymers may be homo- or copolymers and wherein these polymers of at least 5 Monomerbausteinen are constructed.

2. Aqueous microcapsule dispersions according to claim 1, wherein these dispersions contain as additional component viscosity regulators d), with the proviso that the compounds d) are different from the compounds c).

3. Aqueous microcapsule dispersions according to claim 1 or 2, wherein homopolymers are used as polymeric dispersants.

4. Aqueous microcapsule dispersions according to claim 1 or 2, wherein copolymers are used as polymeric dispersants.

5. Aqueous microcapsule dispersions according to any one of claims 1 to 4, wherein as polymeric dispersants c) compounds are used, which are selected from the group xanthan gum, gellan gum, guar, polyacrylates.

6. Use of the aqueous microcapsule dispersions according to one of claims 1 to 5 for finishing textiles with microcapsules.

7. A process for finishing textiles with microcapsules, wherein bringing the textiles with the aqueous microcapsule dispersions according to one of claims 1 to 5 in contact.