NONWOVEN SOLID MATERIAL SUITABLE FOR TOPICAL APPLICATIONS

Abstract

The invention relates to a nonwoven solid material, preferably a cosmetic or dermatological nonwoven solid material, comprising a plurality of fibers, wherein said fibers comprise a body comprising at least one polymeric material and a body coating comprising at least one hydrophilic polymer, said nonwoven solid material further comprising at least one releasable cosmetic ingredient or composition. The invention relates to a face mask, a manufacturing process and applications of said nonwoven solid material or face mask.

Claims

1. A nonwoven solid material, preferably a cosmetic or dermatological nonwoven solid material, comprising a plurality of fibers, wherein said fibers comprise a body comprising at least one polymeric material and a body coating comprising at least one hydrophilic polymer, said nonwoven solid material further comprising at least one releasable cosmetic ingredient or composition.

2. The nonwoven solid material according to claim 1, wherein said fibers are conjugate fibers comprising a body made from at least two polymeric materials and a body coating comprising at least one hydrophilic polymer.

3. The nonwoven solid material according to claim 1, wherein said body comprises at least one polymeric material forming the core of the body, at least one polymeric material forming a sheath of the body, and at least one hydrophilic polymer forming said body coating.

4. The nonwoven solid material according to claim 1, wherein said nonwoven solid material comprises at least one a releasable ingredient or composition providing a skin benefit to a keratin material.

5. A face mask comprising said nonwoven solid material according to claim 1.

6. A process for manufacturing a nonwoven solid material according claim 1, said process comprising (i) extruding at least one polymeric material, (ii) forming a plurality of fibers comprising said at least one polymeric material, (iii) coating said fibers by at least one hydrophilic polymer, and (iv) bonding said plurality of fibers by a bonding process.

7. The process according to claim 6, wherein said bonding process (iv) comprises carding and thermal bonding of said plurality of fibers.

8. The process according to claim 7, wherein said thermal bonding is performed at a temperature for melting the sheath of the fiber body but not melting the core of the body fiber.

9. The process according to claim 5, wherein said process comprises folding said nonwoven solid material, impregnating said nonwoven solid material in liquid and packing said nonwoven solid material in a sachet.

10. A cosmetic article comprising at least one nonwoven solid material according to claim 1.

11. A method for applying a cosmetic providing a skin benefit comprising applying the cosmetic with a nonwoven solid material comprising entangled fibers, wherein said fibers comprise a body comprising at least a polymeric material and a body coating comprising at least one hydrophilic coating.

12. A cosmetic process for providing a skin benefit to a keratin material, comprising the application to the surface of said keratin material of at least one cosmetic article according to claim 10, said nonwoven solid material comprising at least one ingredient or composition providing a skin benefit to a keratin material, said nonwoven solid material releasing said ingredient or composition to said keratin material, wherein said keratin material is preferably skin, in particular skin face.

13. A cosmetic article comprising a face mask according to claim 5.

14. A cosmetic process for providing a skin benefit to a keratin material, comprising the application to the surface of said keratin material of a face mask according to claim 5, said nonwoven solid material comprising at least one ingredient or composition providing a skin benefit to a keratin material, said nonwoven solid material releasing said ingredient or composition to said keratin material, wherein said keratin material is preferably skin, in particular skin face.

Description

[0089] In the figures:

[0090] FIG. 1 schematically represents a fiber according to the present invention.

[0091] FIG. 2 is a graphic representing the absorption capacity and the delivery capacity of the nonwoven solid material according to the invention versus comparative fibers.

[0092] FIG. 3 is a graphic representing the dripping of the nonwoven solid material according to the invention versus comparative nonwoven solid material when the fibers are filled by a liquid composition for topical and cosmetic applications.

[0093] FIG. 4 is a graphic representing the delivery to skin of a liquid composition for topical and cosmetic applications by the nonwoven solid material according to the invention versus comparative nonwoven solid material.

[0094] FIG. 5 is a graphic representing the hydration value of a liquid composition for topical and cosmetic applications by the nonwoven solid material according to the invention versus comparative nonwoven solid material.

EXAMPLES OF INVENTION

Example 1

Preparation of a Nonwoven Solid Material According to the Invention with Bi-Component Fibers Having a Core & Sheath Structure

[0095] This example of invention relates to use of a bi-component fiber having a core & sheath eccentric structure, thereby forming the body of the fiber used to prepared a nonwoven solid material according to the invention. In this structure, the core is composed of polypropylene and the sheath is composed of polyethylene. This bi-component fiber body was treated with an acrylic polymer by coating the body with the acrylic hydrophilic polymer and then converted into a nonwoven solid material having a density of 20 g/m.sup.2 using a thermal bonded process. The binding temperature used was 125 C., so that sheath part of the fibers was melted but core part was still remaining non-melted and results in fibrous substrate. (FIG. 1)

Example 2

Efficacy of a Nonwoven Solid MaterialAbsorption and Delivery Capacities

[0096] In order to test the efficacy of this nonwoven solid material (prepared according to example 1) in terms of absorption and delivery capacities, one cosmetic formulation as shown in Table: 1 was developed: This formulation represents an example of a formulation

TABLE-US-00001 TABLE 1 Name of Ingredient % (w/w) Water 89.2 Glycerin 5 Butylene glycol 3 Pentylene glycol 2 Phenoxy ethanol 0.5 Xanthan Gum 0.3

[0097] The absorption and delivery capacities of developed nonwoven solid material of 20 gsm were compared with commercially available 50 gsm Viscose nonwoven made up with hydroentanglement process. The substrates referred to below and on which the tests were performed are on one hand the nonwoven solid materials according to the present invention and on the other hand the comparative materials (Viscose nonwoven made up with hydroentanglement process).

[0098] Test Method: [0099] Cut 10 pieces of substrates in 55 cm area and dip them in 50 grams of liquid formulation mentioned in table: 1 for 20 minutes. [0100] Take out the substrate from the liquid formulation, wait for 5 seconds to drip out excess liquid formulation and then take weight of wet substrate pieces one by one. [0101] Apply the wet substrate piece on forearm for 15 minutes and then remove substrate from forearm and weigh it. [0102] A=Avg. dry weight of 55 cm substrate. (Avg.: average for the 10 pieces) [0103] B=Avg. wet weight of 55 cm wet substrate. [0104] C=Avg. weigh of substrate after removing from skin. [0105] Absorption Capacity (grams)=BC [0106] Delivery Capacity (grams)=B(A+C)

[0107] FIG. 2 shows that nonwoven solid materials according to the invention are able to absorb 77 times of its dry weight (before impregnation by the liquid formulation) compared to 21 times for cellulosic substrate (comparative material). The absorption capacity is represented by left bars on FIG. 2.

[0108] Also the delivery capacity of the liquid formulation to skin is higher for the nonwoven solid materials according to the invention than for the comparative material (cellulosic nonwoven) (25 times its dry weight in comparison with 6 times for cellulosic nonwoven). The delivery capacity is represented by right bars on FIG. 2.

[0109] This high absorption and high delivery capacity of the material according to the invention make it particularly suitable for topical applications, especially in cosmetic applications, and more particularly as mask applications.

Example 3

Efficacy of a Nonwoven Solid Material Under Pressure

[0110] The same experiment as example 2 was conducted but under influence of pressure on skin. For this, when the nonwoven solid materials were applied on skin, they were covered with a plastic band around forearm to apply pressure on them. It was observed that under pressure the delivery capacity of both nonwovens enhances but enhancement is more for nonwoven solid materials according to the invention than comparative cellulosic nonwoven materials. The high absorption and even high delivery capacity under pressure make the nonwoven solid materials according to the invention suitable topical applications, especially in cosmetic applications, and more particularly for wipes applications.

Example 4

Efficacy of a Nonwoven Solid Material as MaskDripping in Packaging and Delivery to Skin

[0111] Mostly sheet mask prepared according to example 1 are individually packet in sachet and impregnated with the most common range of impregnation for sheet mask: 15 grams to 35 gram of liquid formulation according to table 1. Some part of liquid formulation dripped in the sachet, and tests were conducted to check the dripping quantity of the liquid formulation in sachet by the nonwoven solid materials according to the invention and the comparative material.

[0112] A mask made either by the nonwoven solid materials according to the invention (20 gsm), a 3 layer cellulosic nonwoven material (60 gsm) or a cotton material (43 gsm) was impregnated with 3 different quantities: 20, 25 and 30 grams. These impregnated quantities are referred as filling volume in FIG. 3 (absciss). In FIGS. 3 and 4, the left bars represent the cotton nonwoven material; the right bars the 3 layer cellulosic nonwoven material and the central bars the nonwoven solid materials according to the invention.

[0113] These impregnated masks were sealed individually in an aluminum sachet for 48 hours and then were taken out to weigh. FIG. 3 shows that dripping of the liquid formulation is lesser for the nonwoven solid materials according to the invention than for the cotton and 3 layer cellulosic sheets (ordinate).

[0114] After taking out the mask from sachet, the mask was applied on face for 15 minutes, and after 15 minutes the formulation transferred to skin was evaluated.

[0115] FIG. 4 shows that the nonwoven solid materials according to the invention have a better delivery to skin at least for the materials impregnated with 20 and 25 grams of liquid formulation.

Example 5

Efficacy of a Nonwoven Solid Material for Cosmetic Applications

[0116] In order to understand the cosmetic benefit of having higher delivery of a cosmetic formulation, the hydration benefit of a mask according to example 4 was tested with a corneometer (model: CM825, which work on the principal skin capacitance). Three kind of materials were test in combination with the formulation of Table: 1: [0117] A. Cellulosic sheet of 60 gsm (comparative nonwoven material), [0118] B. nonwoven solid materials according to the invention made up with 5.6 denier fibers (nonwoven solid materials according to the invention), [0119] C. nonwoven solid materials according to the invention made up with 2.2 denier fibers (nonwoven solid materials according to the invention).

[0120] The linear mass density refers to the linear mass density of the fibers of example 1 prior to coating with the acrylic polymer. After coating, the density is not very different.

[0121] These two sheets (A and C) were cut in 55 cm sample size and impregnated with 2.38 gram of formulation. These impregnated sheets were applied individually on forearm of 10 consumers for 15 minutes. After 15 minutes, hydration of the treated zone was measured using corneometer.

[0122] FIG. 5 illustrates that hydration provided by nonwoven solid materials according to the invention is significantly higher than for comparative material (cellulosic nonwoven material).

Example 6

Unfolding Capacity of a Nonwoven Solid Material

[0123] In addition, a study with three consumers was conducted to understand the difficulty in unfolding wet facial mask prepared as for example 4: [0124] Cotton nonwoven material (43 gsm) (comparative nonwoven material), [0125] Cellulosic three layers material (60 gsm) (comparative nonwoven material), [0126] Nonwoven solid material according to the invention (20 gsm).

[0127] The nonwoven materials were double folded and consumers were ask to rank three masks for easiness of unfolding.

[0128] The results are illustrated in table 2.

TABLE-US-00002 TABLE 2 Sample Average (Consumer: 1, 2, 3) Cotton: 43 gsm 3 (3, 3, 3) Nonwoven solid materials according to 1 (1, 1, 2) the invention: 20 gsm Cellulosic 3 layers: 60 gsm 2 (2, 2, 1) Where: 1 = easiest to unfold and 3 = Difficult to unfold

[0129] As shown in Table 2, the mask made up with the nonwoven solid materials according to the invention was found to be the easiest to unfold compared to other two nonwoven materials.