FR2920667A1 - WOUND PROTECTIVE WAFER IMPREGNATED WITH CREAM - Google Patents

Abstract

There is provided a method of manufacturing a cream-impregnated fabric which comprises a carrier and a high viscosity impregnating agent in the form of a water / oil emulsion with a wax portion, which process comprises the following steps: water inlet on an oily phase mixed with a hydrophobic emulsifier, to increase the viscosity, the quantity of incoming water being lower than the amount required to obtain the point of instability of the pure water / oil system; waxing on the oily phase to further increase the viscosity and form the impregnating agent; heating the high-viscosity impregnating agent until it is liquid and the wax portion is melted; application of the impregnating agent now liquid on the support; cooling the support, provided with the impregnating agent, until the latter is again highly viscous and the wax part is again hardened, so that the impregnating agent is distributed homogeneously on the support.

Description

Protective wound fabric impregnated with cream. Field of the Invention The present invention relates to a surface-structured cosmetic or dermatological fabric impregnated homogeneously with a high viscosity impregnation solution in the form of a water / oil cream (w / o), as well as a method for its manufacture.

Background of the invention and state of the art

It is necessary for humanity to wash and care for the skin. Especially since the middle of the 20th century, many other products for body hygiene and body washing have been developed, apart from conventional soaps (in English: rinse off). In addition to solid soap, liquid soap was born to name just one example.

In addition to the unambiguous cleaning of the skin, care has become increasingly important. It has developed a high demand for cosmetics (in English: leave on), which could form a new product sector. A care cream with special product orientations has been preferentially offered for this purpose. Since these products are not washed, it is essential to use products that are gentle and non-irritating to the skin.

In the last twenty years, these product ideas have been transmitted for the first time to wet tissues.

In addition to moist toilet paper, products such as wet baby towels and more recently moist cosmetic fabrics have also been developed.

It is first necessary to differentiate between the support and the lotions, the lotions then being subdivided into surfactant systems and emulsions. The surfactant systems consist of constituents such as perfume essence, water, preservatives and active substances, while the emulsions contain, in addition to the essence of perfume, water, preservatives and active substances. , constituents such as oil and emulsifiers. The emulsions are used in baby towels and cosmetic tissues, because it is absolutely essential, because of the washing and care properties, to incorporate an apolar phase.

Carriers in the care sector are the so-called non-woven fabrics (spunlace). This concept defines the manufacture of the support. Different substances (cotton, plastic fibers, viscose, among others), at least two, are mixed together under a jet of water. The grammage can then vary from 30 - 120 g / m2. The effort, to use the most flexible material possible for gentle care, is fundamental. In this area, significant progress has been made in recent years. Surface-structured fabrics are also already known. They can be differentiated according to their method of manufacture - for example fixing by water jet and thermal impregnation.

In the technically important step, the known emulsions and the support are then combined with each other. Thus, an impregnated material for application in wet tissues is described, for example, in EP 1 210 928 B1.

In such cases, the object of current use proper thus consists of two components: a) a dry fabric, structured of materials such as paper and / or of the most diverse mixtures of natural or synthetic fibers, and b) an impregnating solution.

These impregnation solutions are however without exception low viscosity.

A washing cloth impregnated with cream - therefore a fabric with a high-viscosity impregnating agent - is described for the first time in Applicant's publication PCT / EP / 2007/000556, in which the cream is distributed homogeneous in the fabric. The cream, however, is based on a high viscosity oil / water emulsion (o / w) for normal washing and care and not on a water / oil emulsion (w / o).

The use of w / o emulsions is a priority for products intended for intensive care until the washing of wounds. But it has been impossible so far to fix on a fabric a w / o-based cream - therefore a high-viscosity agent: the two emulsion systems o / w and w / o, are not only reversed in their phase, but also behave differently with respect to physical parameters. Thus, in the previously cited publication PCT / EP2007 / 000556 of the applicant, the phase transition was achieved by the use of liquid crystal structures - but this behavior does not appear in an emulsion w / o .

There is therefore, as before, the need for a tissue uniformly provided with a cream w / o, which allows to obtain more intensive care until washing wounds. Summary of the invention

It is an object of the present invention to provide a technology which allows a uniform application of a high viscosity w / o emulsion to a carrier (eg a nonwoven) - also on an impregnated carrier.

This object has been achieved by a process according to the invention or by a cream-impregnated fabric according to the invention. The method relates to the manufacture of a cream-impregnated fabric, which comprises a carrier and a high viscosity impregnating agent in the form of a water / oil emulsion with a wax portion, and is characterized by the following steps: -injection of water on an oily phase mixed with a hydrophobic emulsifier, to increase the viscosity, the amount of water inlet being lower than the amount required to obtain the point of instability of the pure water / oil system; The addition of wax to the oil phase, to further increase the viscosity and to form the impregnating agent, heating of the high-viscosity impregnating agent, until it is liquid and the parts wax are melted; application of the impregnating agent now liquid on the support; cooling the support provided with the impregnating agent, until the impregnating agent is again highly viscous and the wax part is again hardened, so that the impregnating agent is distributed homogeneously on the support.

According to a preferred embodiment of the process, the impregnating agent, at temperatures <40 ° C, is present in solid, creamy or pasty form.

The process is also characterized in that the impregnating portion is present for 100-700% by weight of lotion / fabric. Finally, it is advantageous that the process is characterized in that the support has a weight of 30 - 120 g / m 2.

The cream-impregnated fabric therefore comprises a carrier and a high viscosity impregnating agent in the form of a water / oil emulsion with a part of wax, and is characterized in that the amount of water contained is lower. the amount of water required to obtain the point of instability of the pure water / oil system, and that the impregnating agent is distributed homogeneously on the support. According to an advantageous embodiment of the invention, the cream-impregnated fabric is characterized in that the impregnating agent, at temperatures <40 ° C, is present in solid, creamy or pasty form. The fabric impregnated with cream is further characterized in that the impregnating portion is present for 100-700% by weight of lotion / fabric.

In a final embodiment of the cream-impregnated fabric, the carrier has a weight of 30 - 120 g / m 2.

Description of figures

Figure 1 shows schematically the viscosity and stability of conventional w / o emulsions as a function of water content.

Figure 2 shows an operational diagram of the manufacturing method according to the invention.

Description of Preferred Embodiments

Figure 1 shows the viscosity and stability of conventional w / o emulsions as a function of water share. Usually, w / o emulsions are prepared so that an oily phase is mixed with a hydrophobic emulsifier (which does not depend on the temperature). By adding water, the viscosity first increases due to the crosslinking and then decreases after a maximum has been reached - this behavior is apparent from the continuous bell curve of Fig. 1. Before the viscosity has passed its however, the system begins to become unstable, i.e., phase separation is to be observed - as shown by the dotted line in FIG. 1. When preparing such emulsions, the highest water possible is added, but not above the point of instability.

The surface in FIG. 1, which is delimited to the left by the y axis, upwards by the stability curve and to the right and downwards by the viscosity curve, can therefore be described in this respect as a kind of stability potential: If we remain at the water share below the point of intersection of the stability curve and the viscosity curve, we obtain an emulsion w / o of increasing viscosity for a stable behavior.

Applicant of the present invention has now discovered that this stability potential is however also usable in another way. Instead of increasing the water content to raise, as usual until now, viscosity by this cheap substance, the addition of water can be stopped well from a certain point in the water. below the point of instability and an extra apolar wax phase can be incorporated instead of another amount of water. A use of the stability potential also occurs in this case: the viscosity also increases, but here by the part of wax.

The advantage of this procedure is that it is possible in this way to manufacture fabrics impregnated with cream w / o. The wax content allows - also for a high viscosity> 2000 mPas of the total emulsion - an application to wet tissues by melting, with a precise adjustment of the impregnation, as described below.

For the present invention, suitable emulsions with a viscosity> 2000 mPas have been developed, as shown for example in Table 1.

Table 1: example of cream-impregnated fabric formulation Component Part (wt%) Aqua ad 100 Ethylhexyl-palmitates 24.5 Cera Alba 7.7 Butyrospermum Parkii 7.7 Glycerin 1.8 Polyglyceryl-3 polyricinoleates 1.5 Oleate of sorbitan 1.0 Caprylyl glycol 0.5 Magnesium sulphates 0.5 Ethylhexylglycerine 0.2 Tocopherol acetates 0.2 Olea europea Oil 0.1 The impregnating agent then advantageously contains high melting waxes as as constituent of the oily phase. For example, the following substances have proved particularly advantageous:

- - Beeswax - Shea Butter 20 - Jojoba Ester - Olive Oil Ester Mimosa Wax Evening Primrose Wax

with Olive oil Ethylhexyl-palmitates Almond oil Jojoba oil Dicaprylyl-carbonates Caprylic / capric trigycerides

In the present w / o emulsion, it has surprisingly been found a proportional function between the viscosity and the melting point composition of the outer phase (oil in this case).

Figure 2 is an operational diagram of the manufacturing process. The highly viscous w / o or cream emulsion is then heated with a portion of wax at about 60 ° C, until it is liquid and the wax portion is melted. The liquefied cream is then applied to the support. The support, provided with the cream, is then cooled again until the cream is again very viscous and the wax part is hardened again. The impregnating agent is now homogeneously distributed on the support. The waxy phase then melts under the effect of the temperature at a viscosity <2000 mPas. The melting temperature could be determined at dTs = 55 ° C and the solidification temperature in the return at dTE = 40 ° C. The viscosities were modified by the use of 9 waxes of 280 mPas at room temperature up to 130,000 mPas (20 ° C).

The basis for this other behavior of the w / o emulsion with respect to an o / w emulsion is that the oily phase is located outside in an emulsion w / o, so the wax part is also decisive for the behavior as a function of the temperature. In an o / w emulsion, on the other hand, the viscosity is strongly influenced by the emulsifiers and with regard to the temperature dependence - by liquid crystals: the oily phase here forms the inner phase and the liquid crystal phases are formed in the liquid phase. water in the form of an outer phase.

According to the invention, the compositions optionally contain, in addition to the aforementioned substances, the current additives in cosmetics. These are, for example, essence of perfume, preserving agents, plant extracts, vitamins, active substances, antioxidants, or other common constituents of a cosmetic or dermatological formulation, such as Alcohols, glycerin, polyether, polymers or derivatives of silicone.

The present invention finds its application in deodorant impregnated fabrics, washing and cosmetic and dermatological care, in impregnated fabrics intended to fight against diseases of the skin (for example acne), in impregnated healing tissues and in tissues which prepare or treat the skin in a targeted way before or after sunbathing.

Claims (8)

claims A process for producing a cream impregnated fabric which comprises a carrier and a high viscosity impregnating agent in the form of a water / oil emulsion with a wax portion, characterized by the following steps. water inlet on an oily phase mixed with a hydrophobic emulsifier, to increase the viscosity, the amount of water inlet being lower than the amount required to obtain the point of instability of the pure water / oil system; waxing on the oily phase to further increase the viscosity and form the impregnating agent; heating the high-viscosity impregnating agent until it is liquid and the wax portion is melted; application of the impregnating agent now liquid on the support; cooling the support provided with the impregnating agent, until the impregnating agent is again highly viscous and the wax part is again hardened, so that the impregnating agent is distributed homogeneously on the support. 2. Process according to claim 1, characterized in that the impregnating agent, at temperatures <40 ° C, is present in solid, creamy or pasty form. 1130 3. Method according to one of claims 1 or 2, characterized in that the impregnating portion is present for 100 - 700% by weight of lotion / tissue. 4. Method according to one of the preceding claims, characterized in that the support has a weight of 30 - 120 g / m2. Cream-impregnated fabric comprising a carrier and a high viscosity impregnating agent in the form of a water / oil emulsion with a part of wax, characterized in that the quantity of water contained is smaller than the quantity required to obtain the point of instability of the pure water / oil system, and that the impregnating agent is distributed homogeneously on the support. 6. A cream-impregnated fabric according to claim 5, characterized in that the impregnating agent, at temperatures <40 ° C, is present in solid, creamy or pasty form. 7. Fabric impregnated with cream according to one of claims 5 and 6, characterized in that the impregnating part is present for 100-700% by weight of lotion / fabric. Cream-impregnated fabric according to one of Claims 5 to 7, characterized in that the support has a weight of 30 - 120 g / m2.