EP2108735B1 - Loadable fibres and textile sheets - Google Patents

Abstract

A fibre-based textile material bears a mixture of absorbent micro-spheres and polymers that form a film that fixes the micro-spheres to the textile. The micro-spheres incorporate a void holding an active skin-comfort ingredient that is replenished from time to time. The micro-spheres are polymethyl-methacrylate (PMMA).

Description

Field of the invention

The invention is in the field of sustained release of active ingredients, in particular for the finishing of fibers and fabrics.

State of the art

The term "wearing comfort" summarizes the increased demands of the consumer, who no longer wants to be satisfied with the fact that the clothes he wears directly on the skin, such as lingerie or tights, neither scratch nor cause reddening of the skin, but are expected in the opposite way. that it has a positive effect on the condition of his skin. This can be either to remedy fatigue, as well as to convey a fresh scent or to avoid skin roughness. There has therefore been no lack of efforts to equip textiles, for example, women's tights, with cosmetic agents that merge when wearing on the skin and there cause the desired effects.

• Wirkstoffe werden in Mikrokapseln eingebracht und die beladenen Mikrokapseln auf Textilien aufgebracht. Durch mechanische Zerstörung der Mikrokapseln, z.B. durch Reibung auf der Haut, werden die Wirkstoffe freigesetzt. Nachteilig an dieser Lösung ist, dass die Mikrokapseln, also gewissermaßen die "Behälter" der Wirkstoffe, zerstört werden.

An important technical task in this context is to equip textiles with active ingredients; Of particular importance here are:

• Active substances are introduced into microcapsules and the loaded microcapsules are applied to textiles. By mechanical destruction of the microcapsules, eg by friction on the skin, the active ingredients are released. A disadvantage of this solution is that the microcapsules, so to speak, the "container" of the active ingredients are destroyed.

Database WPI Week198848 (AN 1988-343069) and JP 63-256769 disclose a textile provided with a mixture of loaded porous microcapsules and film-forming polymers.

Database WPI Week199019 (AN 1990-142321) and JP 02-084595 discloses a material that releases insecticides; it contains porous three-dimensional microcapsules that make an insecticide.

US 2006/0264547 A1 describes refractory superabsorbent polymexes that can absorb many times their own weight in water. It also discloses a blend of superabsorbent microspheres loaded with flame retardant agents and a film forming binder.

EP 1,600,210 Al describes loaded microspheres. It involves loading microspheres with active ingredients and then applying the loaded microspheres to textile surfaces where they are physically adsorbed without the use of binders. Although in this technical solution, a certain wash resistance is given, but this does not meet the highest requirements.

WO 2006/015718 A1 describes fibers and fabrics which are characterized by being blended with mixtures of (a) hydrophobic actives and (b) binders. Here are agents without the mediation of microcapsules or the like applied to Textilobefflächen, but not directly, but by means of film-forming polymers (binders). This technical solution lacks a controlled release of the active ingredients.

Description of the invention

It was the object of the present invention to provide a technical solution for ensuring that textiles can be loaded and reloaded by the user with any desired active ingredients. In this case, a controlled release of the active ingredients should be given. Furthermore, an improved compared to the prior art washing permanence should be given. By wash permanence is to be understood that the above-mentioned desirable properties of the textiles are lessened by washing only to a limited extent.

1. (a) absorbierenden Mikrosphären und
2. (b) filmbildenden Polymeren

ausgerüstet sind, mit der Maßgabe, dass die Komponente (a) mittels der Komponente (b) auf der Textiloberfläche fixiert ist, wobei die Mikrosphären (a) unbeladen sind.The invention initially fibers and fabrics, characterized in that they are made with mixtures of

1. (a) absorbent microspheres and
2. (b) film-forming polymers

with the proviso that the component (a) is fixed by means of the component (b) on the textile surface, wherein the microspheres (a) are unloaded.

The microspheres (a) are unloaded. They fulfill the function that they can be loaded by the user as desired and, after release of the active ingredients, can also be reloaded as desired.

To the absorbent microspheres (a)

Absorbent microspheres are structures that have a largely homogeneous structure. The absorbent microspheres used in the context of the present invention have the property of being able to absorb and also release active substances, both of which can be done several times, ie. Active substances can be absorbed by loading or reloading and released again over time. Because of this property, these microspheres are referred to as absorbent microspheres. For the sake of simplicity, however, the term "absorbent" (* capable of taking active ingredients) will be omitted below and simply referred to as microspheres. The active ingredients can be adsorbed on the surface of the microspheres and / or dissolved in the microspheres and / or in the microspheres e.g. be embedded in fine channels. Microspheres are dimensionally stable, i. they are not destroyed in the release of the active ingredients. It should be expressly stated that microcapsules, which are indeed destroyed in the release of the active substances, do not fall under the definition of microspheres.

• Die Mikrosphären wirken als Container für Wirkstoffe.
• Die Mikrosphären sind formstabil und werden durch Freisetzung der Wirkstoffe nicht zerstört.
• Die Mikrosphären können mehrfach - auch mit unterschiedlichen Wirkstoffen - nachbeladen werden (reload).

The central point of the technical solution proposed by the present invention is a combination of several factors:

• The microspheres act as containers for active ingredients.
• The microspheres are dimensionally stable and are not destroyed by release of the active ingredients.
• The microspheres can be reloaded several times - even with different active ingredients - (reload).

The microspheres are fixed by - one or more - film-forming polymers on the textile surface, resulting in a relative to the prior art, relative improvement of the washing permanence.

The microspheres are preferably spherical in shape, but are not limited in geometry to spheroidal shape, but may have other spatial shapes, for example, they may represent rotatiosellipsoids or have a rod shape.

The microspheres preferably have an average particle size in the range of 1 to 15 microns, and more preferably 5 to 10 microns.

In one embodiment, microsphere based on polymethylmethacrylate (PMMA) is used. Examples are, for example, Covabead LH 85 or LH 170 from the company LCW or Cosmedia PMMA V8, Cosmedia PMMA V 12 or Cosmedia SILC from Cognis.

In one embodiment, silicone-based or SiO ₂ -based microspheres are used. Examples are "Dow Corning 9509 Silicone Elastomer Suspension" from Dow Corning.

In a preferred embodiment, microspheres based on polymethylmethacrylate (PMMA) are used.

To the film-forming polymers (b) (Binder)

• Polyurethanen (PU),
• Polyethylvinylacetaten (EVA),
• polymeren Melaminverbindungen,
• polymeren Glyoxalverbindungen,
• polymeren Siliconverbindungen,
• epichlorhydrinvernetzten Polyamidoaminen und
• Poly(meth)acrylaten

The film-forming polymers (b) which are suitable for the purposes of the invention, which can also be referred to as binders, can be of any type per se. Preferably, they are selected from the group formed by

• Polyurethanes (PU),
• Polyethylvinyl acetates (EVA),
• polymeric melamine compounds,
• polymeric glyoxal compounds,
• polymeric silicone compounds,
• epichlorohydrin crosslinked polyamidoamines and
• Poly (meth) acrylates

Suitable polyurethanes (PU) and polyethylvinyl acetates (EVA) are, for example, the commercially available products from the Cognis 3011-A or Cognis 3009-A range from Cognis.

Polymeric melamine compounds: Melamine (synonym: 2,4,6-triamino-1,3,5-triazine) is usually formed by trimerization of dicyandiamide or by cyclization of urea with elimination of carbon dioxide and ammonia. For the purposes of the invention, melamine refers to oligomeric or polymeric condensation products of melamine with formaldehyde, urea, phenol or mixtures thereof. Polymeric Glyoxal Compounds: Glyoxal (synonym: oxaldehyde, ethanedial) results from the vapor phase oxidation of ethylene glycol with air in the presence of silver catalysts. For the purposes of the invention, glyoxals are understood as meaning the self-condensation products of glyoxal ("polyglyoxals").

Silicone compounds: Suitable silicone compounds are, for example, dimethylpolysiloxanes, methylphenylpolysiloxanes, cyclic silicones and amino, fatty acid, alcohol, polyether, epoxy, fluorine, glycoside and / or alkyl-modified silicone compounds which are preferably solid or resin-form at room temperature. Also suitable are simethicones, which are mixtures of dimethicones having an average chain length of from 200 to 300 dimethylsiloxane units and hydrogenated silicates. Particularly preferred is the use of aminosiloxanes, eg Cognis 3001 from Cognis. Their further crosslinking with H-siloxanes, eg Cognis 3002 from Cognis, can further increase the performance as a binder.

1. i) Polyaminoamide werden (a) zunächst mit einer Menge von 5 bis 30 Mol-% - bezogen auf den zur Quaternierung zur Verfügung stehenden Stickstoff - eines Quaternierungsmittels umgesetzt, und (b) anschließend die resultierenden quatemierten Polyaminoamide mit einer dem Gehalt an nicht quaterniertem Stickstoff entsprechenden molaren Menge Epichlorhydrin vernetzt, oder
2. ii) Polyaminoamide werden (a) zunächst bei 10 bis 35°C mit einer Menge von 5 bis 40 Mol-% - bezogen auf den für die Vernetzung zur Verfügung stehenden Stickstoff - Epichlorhydrin umgesetzt, und (b) das Zwischenprodukt auf einen pH-Wert im Bereich von 8 bis 11 einstellt und bei einer Temperatur im Bereich von 20 bis 45°C mit einer weiteren Menge Epichlorhydrin vernetzt, so dass das molare Einsatzverhältnis in Summe 90 bis 125 Mol-% - bezogen auf den für die Vernetzung zur Verfügung stehenden Stickstoff - beträgt.

Epichlorohydrin Crosslinked Polyamidoamine: Epichlorohydrin Crosslinked Polyamidoamines, also referred to as "fibrabones" or "wet strength resins" , are well known in textile and paper technology. Their preparation is preferably based on two methods:

1. i) Polyaminoamides are (a) first reacted with an amount of 5 to 30 mol% based on the nitrogen available for quaternization of a quaternizing agent, and (b) subsequently the resulting quaternized polyaminoamides having a content of non-quaternized nitrogen corresponding molar amount of epichlorohydrin crosslinked, or
2. ii) Polyaminoamides are (a) reacted first at 10 to 35 ° C in an amount of 5 to 40 mol% based on the nitrogen available for the crosslinking of epichlorohydrin, and (b) the intermediate product to a pH in the range from 8 to 11 and cross-linked at a temperature in the range of 20 to 45 ° C with a further amount of epichlorohydrin, so that the molar use ratio in total from 90 to 125 mol% - based on the nitrogen available for the crosslinking - is.

Poly (meth) acrylates: The term poly (meth) acrylates are homo- and copolymerization products of acrylic acid, methacrylic acid and optionally their esters, especially their esters with lower alcohols, such as methanol, ethanol, isopropyl alcohol, the isomeric butanols, cyclohexanol and the like to understand which are obtained in a conventional manner, for example by free-radical polymerization under UV irradiation. Typically, the average molecular weight of the polymers is between 100 and 10,000, preferably 200 and 5,000 and especially 400 to 2,000 daltons.

Usually, the binders (b) - based on the component (a) - in amounts of 0.5 to 15, preferably 1 to 10 and especially 1 to 5 wt .-% applied to the fibers. Component (a) is to be understood as meaning the microspheres in unloaded form.

drugs

The choice of active ingredients that are intended to load the microspheres is not critical per se and depends exclusively on which effect is to be effected on the skin. For the textile equipment, but also for cosmetic applications, such active ingredients are preferred which have moisturizing properties or counteract cellulite. Typical examples are tocopherol, tocopherol acetate, tocopherol palmitate, carotenes, caffeine, ascorbic acid, (deoxy) ribonucleic acid and their fragmentation products, β-glucans, retinol, bisabolol, allantoin, phytantriol, panthenol, AHA acids, amino acids, ceramides, pseudoceramides, chitosan, dihydroxyacetone , Menthol, squalane, essential oils (eg lavender oil, lemon oil, eucalyptus oil or peppermint oil), vegetable oils (eg Monoi de Tahiti, shea butter, almond oil, passion fruit oil, rosehip seed oil or apricot oil), vegetable proteins and their hydrolysis products, plant extracts, such as Extracts of Ginkgo biloba, Camellia sinensis, Trifolium pratensis, Oleacea europensis, Litchi sinensis, Valeriana oficinalis, Medicago sativa, Vitis vinifera, Passiflora incarnata and the like as well as vitamin complexes.

It is particularly preferable to select the active compounds from the group formed by essential oils, vegetable oils, squalane, chitosan, menthol, retinol (or vitamin A), caffeine, vegetable or animal proteins and their hydrolysis products, carotenes and jojoba oil. These have a very broad property profile and contribute individually or in combination to the balance of the cutaneous hydrolipid layer, prevent the loss of water and thus the formation of wrinkles, refresh the skin and counteract fatigue, give the skin a soft and elastic feeling, improve the skin drainage, the supply of nutrients and the blood circulation, act against oxidative stress, environmental toxins, skin aging and free radicals, compensate for the loss of fats caused by water and sun, improve the water resistance of UV filters, ensure a Homogeneous browning and finally also have antimicrobial properties.

Usually, the weight ratio between the component (a) - such as the finely divided PMMA - and the active ingredients is 10: 90 to 99: 1, preferably 3: 1 to 1: 1 and more preferably about 2: 1.

Examples Substances used

• Cosmedia PMMA V8 : PMMA microspheres from Cognis
• Covabed LH 85 : PMMA microspheres from LCW
• Cognis 3001-A : Aminosiloxane emulsion from Cognis
• Cognis 3002-A : H-polydimethylsiloxane emulsion from Cognis
• Cognis 6003-A : alkyl polyglycol ether, surfactant (wetting agent) from Cognis
• Cognis 4001-S1 : Cosmetic emulsion from Cognis

Equipment of textiles with microspheres Example 1 (according to the invention)

The "Covabed LH 85" microspheres were converted into a 10% by weight aqueous dispersion using the "Cognis 6003-A" surfactant in demineralized water. The dispersing unit used was an Ultra-Turrax type agitator). The dispersion thus prepared contained 10% by weight of PMMA microspheres. The dispersion is hereinafter referred to as DISP-1.

Next, a PA / EL (76/24%) knit (knit fabric in which the yarn is made of 76% polyamide and 24% spandex (e.g., Lycra)) was impregnated with the following solution (liquor) by means of a laboratory padder:

Fleet according to Example 1:

DISP-1 50 parts Cognis 3001-A 8th parts Cognis 3002-A 0.3 parts water 41.7 parts

Example 2 (according to the invention)

The "Cosmedia PMMA V8" microspheres were converted into a 10% by weight aqueous dispersion using the "Cognis 6003-A" surfactant in demineralized water. The dispersing unit used was an Ultra-Turrax type agitator). The dispersion thus prepared contained 10% by weight of PMMA microspheres. The dispersion is hereinafter referred to as DISP-2.

Subsequently, a PA / EL (76/24%) - knitted fabric was impregnated by means of a laboratory foulard with the following solution (liquor):

Fleet according to Example 2:

DISP-2 50 parts Cognis 3001-A 8th parts Cognis 3002-A 0.3 parts water 41.7 parts

Example 3 (for comparison)

A PA / EL (76/24%) - knit fabric was impregnated by means of a laboratory padder with the following - microsphere-free - solution (liquor):

Fleet according to Example 3:

Cognis 3001-A 8th parts Cognis 3002-A 0.3 parts water 91.7 parts

Loading of microsphere finished textiles

The padded swatches prepared according to Examples 1 to 3 above were each dried at 120 ° C for 3 minutes.
The dried swatches were then treated with 10% by weight Cognis 4001-S 1 by weight. The application took place again on the padder.
The fabric samples thus obtained were each divided into 4 parts and each washed 0-, 1-, 3- and 10 times and dried on a leash. The laundry was carried out in accordance with ISO 6330 (Miele household washing machine, 13 g / l ECE detergent, 40 ° C easy-care program).

Thus, the following samples were available:

• Sample 1, microspheres "Covabed LH 85" loaded with 10% "Cognis 4001-S1": 0, 1, 3 and 10 household washes.
• Sample 2, "Cosmedia PMMA V8" microspheres loaded with 10% "Cognis 4001-S1": 0, 1, 3 and 10 household washes.
• Sample 3, no microspheres, loaded with 10% Cognis 4001-S1: 0, 1, 3 and 10 household washes.

All of these samples were extracted with tetrahydrofuran (solvent) and then the extract analyzed by GC-MS. The reference substances used in the cosmetic emulsion "Cognis 4001-S 1" cosmetic ingredients "Monoi" (Monoi de Tahiti = coconut oil with traces of Tiare flower) and vitamin E acetate.

The analysis produced the following picture:

Sample 1: Microspheres "Covabed LH 85" loaded with 10% "Cognis 4001-S1": 0, 1, 3 and 10 household washes. washes % Monoi % Vitamin E acetate 0 0.266 0.085 1 0.163 0, 066 3 0,139 0.058 10 0.121 0.053

The% data in this table are to be understood as:% by weight of the respective active substance (mono egg or vitamin E acetate) based on the weight of the substance.

If the quantities of the ingredients are standardized to 100 before the washing process (ie for 0 washes), then the relative decrease in the amounts of active substance in the washes is as follows: To wash % Monoi % Vitamin E acetate 0 100 100 1 61.3 77.7 3 52.3 68.2 10 45.3 62.4

Sample 2: "Cosmedia PMMA V8" microspheres loaded with 10% "Cognis 4001-S1": 0, 1, 3 and 10 household washes. washes % Monoi % Vitamin E acetate 0 0,269 0.084 1 0.097 0,045 3 0.114 0.043 10 0.104 0,042

The% data in this table are to be understood as:% by weight of the respective active substance (mono egg or vitamin E acetate) based on the weight of the substance.

If the quantities of the ingredients are standardized to 100 before the washing process (ie for 0 washes), then the relative decrease in the amounts of active substance in the washes is as follows: washes % Monoi % Vitamin E acetate 0 100 100 1 36.1 53.6 3 42.4 51.2 10 38.7 50.0

Sample 3: no microspheres loaded with 10% Cognis 4001-S1: 0, 1, 3 and 10 household washes washes % Monoi % Vitamin E acetate 0 0.217 0.067 1 0.078 0.026 3 0,076 0.024 10 0.081 0.028

The% data in this table are to be understood as:% by weight of the respective active substance (mono egg or vitamin E acetate) based on the weight of the substance.

If the quantities of the ingredients are standardized to 100 before the washing process (ie for 0 washes), then the relative decrease in the amounts of active substance in the washes is as follows: washes % Monoi % Vitamin E acetate 0 100 100 1 35.9 38.8 3 35.0 35.8 10 37.3 41.8

Conclusion:

In comparison to sample 3 (reference for comparison), in which the textiles were only provided with binders but did not contain any microspheres, samples 1 and 2 according to the invention, in which the textiles were equipped with microspheres and binders, showed in particular FIGS. 1 and 3 Wash significantly higher levels of the cosmetic ingredients Monoi and vitamin E acetate on, which is a higher wash permanence proven.

Claims (2)

1. Fibres and textile fabrics, characterized in that they are endowed with mixtures of

   (a) absorbent microspheres, and

   (b) film-forming polymers,

   with the proviso that component (a) is fixed to the textile surface using component (b), wherein the microspheres (a) are unloaded.
2. Fibres and textile fabrics according to Claim 1, wherein polymethyl methacrylate (PMMA) is used as component (a).