HK1240099B - Cosmetics comprising cosmetic composition-impregnated urethane foam - Google Patents

Description

Cosmetic product comprising polyurethane foam impregnated with a cosmetic composition

This application is a divisional application based on the Chinese patent application with application number 201280002267.3 and application date on March 23, 2012.

【Technical field】

The present invention relates to polyurethane foams for impregnation with cosmetic compositions.

[Background Technology]

In the past, cosmetic compositions were primarily used indoors. However, with the recent rise in leisure activities and the corresponding changes in modern lifestyles, cosmetic compositions have become increasingly used outdoors. In particular, UV-protective cosmetic compositions were previously used primarily in the summer. However, as modern people enjoy outdoor activities and are increasingly aware of the harmful effects of UV rays, the trend is towards frequent use of UV-protective cosmetic compositions in all seasons, not just summer. Consequently, there is a growing demand for cosmetic compositions that are easy to use and carry.

Polyester-based polyurethane foam was developed by German technologists in the late 1940s, a period marked by the development of plastics materials. Because it is based on polyester, it is also known as ester foam. Its production does not require advanced technology. Consequently, polyester-based polyurethane foam has been widely manufactured and used in various industrial fields, particularly those requiring high tensile strength.

However, polyester-based polyurethane foams tend to break easily in wet environments. Furthermore, they have a microporous structure and low air permeability, resulting in a low soft feel, flexibility, and pliability. Consequently, polyester-based polyurethane foams are unsuitable for use in impregnating cosmetic compositions, particularly liquid cosmetic compositions. Under these circumstances, there is an urgent need to develop polyurethane foams suitable for use in impregnating cosmetic compositions.

【public】

【Technical Issues】

The present disclosure aims to provide a polyurethane foam for use in impregnating a cosmetic composition, the polyurethane foam being capable of maintaining high stability of the impregnated cosmetic composition as well as high post-impregnation stability.

【Technical solution】

In one general aspect, there is provided a polyether-based polyurethane foam for use in an impregnated cosmetic composition.

Beneficial effects

The polyether-based polyurethane foam disclosed herein maintains high stability even after being impregnated with a cosmetic composition, and improves the portability and feel of the cosmetic composition.

【Brief Description of the Drawings】

FIG1 is a microscopic view of a wet polyether-based polyurethane foam;

FIG2 shows a packaged cosmetic product encapsulating a polyurethane foam impregnated with a W/O type emulsion cosmetic composition;

Figure 3 is a microscopic view of the polyurethane foams listed in Table 2, each magnified 10×0.3;

FIG4 is a microscopic view of the polyurethane foams listed in Table 3, each magnified 10×0.3; and

FIG5 shows photographs of Example 1, Comparative Example 1 and Comparative Example 2 after storage at 50° C. for 2 hours.

[Specific implementation method]

In one aspect, a polyether-based polyurethane foam is provided for use in impregnating a cosmetic composition. In another aspect, the polyether-based polyurethane foam can serve as a carrier in which the cosmetic composition is supported and retained.

The term "polyurethane foam" used herein means a polyurethane resin that is foamed and cured, also referred to as "foamed polyurethane".

In one aspect, polyether-based polyurethane foams are more resistant to moisture than polyester-based polyurethane foams, thus being less prone to cracking under high humidity conditions and exhibiting high stability. Furthermore, polyether-based polyurethane foams have a larger pore structure than polyester-based polyurethane foams, resulting in improved air permeability, a softer feel, flexibility, and pliability. Furthermore, polyether-based polyurethane foams require reduced production costs and are therefore more cost-effective than polyester-based polyurethane foams.

In one aspect, the polyurethane foam may include a dry polyurethane foam or a wet polyurethane foam. In particular, the wet polyether-based polyurethane foam has the properties shown in Table 1 below.

[Table 1]

Generally, wet polyether-based polyurethane foams have smaller pore sizes and a denser structure than dry polyether-based polyurethane foams. Dry polyether-based polyurethane foams have oleophilic surface properties, while wet polyether-based polyurethane foams, as a result of wet foaming, have hydrophilic surface properties. Wet polyether-based polyurethane foams are continuous microcellular polyurethane foams with uniformly high porosity, exhibiting high water/oil absorbability. Figure 1 is a microscopic view of wet polyether-based polyurethane foam.

In one aspect, the polyurethane foam may have a hardened or reticulated structure. In another aspect, the polyurethane foam may have a reticulated structure that allows for uniform and easy impregnation with the cosmetic composition and provides a high impregnation ratio.

In one aspect, the density of the polyurethane foam can be 1-3 pounds per cubic foot (pcf), particularly 1-2 pcf. When the density of the polyurethane foam is less than 1 pcf, the cosmetic composition may be excessively released, making it inconvenient to use. When the density of the polyurethane foam is greater than 3 pcf, it is impossible to provide a sufficient number of pores for impregnation of the cosmetic composition, making it difficult to effectively impregnate the cosmetic composition.

In one aspect, the polyurethane foam may have a pore count of 70-120 pores per inch (ppi), particularly 75-95 ppi. When the pore count of the polyurethane foam is less than 70 ppi, it has poor elasticity, is inconvenient to use, and has difficulty controlling the flowability of the cosmetic composition. When the pore count of the polyurethane foam is greater than 120 ppi, it provides the cosmetic composition with low durability and a poor feel during use.

In one aspect, the polyurethane foam can have an ASKER hardness of 10-70, particularly 20-60, and more particularly 30-50, as measured by a DUROMETER HARDNESS TESTER (Type F) available from ASKER. When the polyurethane foam is too soft, such that its hardness is less than 10, the cosmetic composition impregnated in the polyurethane foam may be excessively released when it is used by a cosmetic implement such as a nitrile rubber (NBR) powder puff or by hand to package the cosmetic composition encapsulated in the container. When the polyurethane foam is too hard, such that its hardness is greater than 70, the cosmetic composition may not be easily released.

On the one hand, polyurethane foam can have an open-cell structure. When polyurethane foam has a closed-cell structure, bubbles are retained in the polyurethane, making it difficult for low-density emulsion-type cosmetic compositions to be impregnated therein. Therefore, polyurethane foam with an open-cell structure can be used exclusively.

In one aspect, the cosmetic composition to be impregnated in the polyurethane foam includes a liquid cosmetic composition, particularly an emulsion-type cosmetic composition, more particularly a water-in-oil (W/O) type or oil-in-water (O/W) type emulsion cosmetic composition.

In one aspect, the emulsion cosmetic composition can have a low viscosity, particularly 5,000 to 15,000 centipoise (cp), more particularly 6,000 to 10,000 cp. When the viscosity of the emulsion cosmetic composition is less than 5,000 cp, it may separate into an oil phase and an aqueous phase, making it difficult to uniformly impregnate the polyurethane foam with the composition. When the viscosity of the emulsion cosmetic composition is greater than 15,000 cp, it may provide an undesirable sticky and heavy feel when applied to the skin.

In one aspect, the cosmetic composition includes a skin care composition and a makeup composition. Non-limiting examples of the cosmetic composition can include a makeup primer, a makeup primer, a foundation, a powder, a two-in-one pressed powder, a lipstick, a lip balm, an eyeshadow, an eyebrow pencil, a concealer, a lip liner, a blush, a UV protectant, a lotion, a cream, or an essential oil. More particularly, the cosmetic composition can be formulated as a makeup primer, a makeup primer, a liquid or solid foundation, a powder, a two-in-one pressed powder, a lipstick, a lip balm, an eyeshadow, an eyebrow pencil, a concealer, or a blush, but is not limited thereto.

On the one hand, a cosmetic product is provided, wherein a polyether-based polyurethane foam impregnated with a cosmetic composition is encapsulated. The cosmetic product includes a cosmetic composition applied to the polyether-based polyurethane foam disclosed herein, thereby allowing high-quality packaging of the cosmetic composition. In addition, the cosmetic product allows the cosmetic composition to be uniformly loaded in the polyurethane foam for a long time and can be released in sufficient amount when the user takes the cosmetic composition. Further, the cosmetic product maintains high long-term durability and stability. The cosmetic product disclosed herein can be provided as a packaged container, usually abbreviated as a "pact", which generally includes a lower part and an upper part, the lower part being filled with the polyether-based polyurethane foam, and the upper part having a lid, which can be combined with a mirror or the like. Figure 2 shows an example diagram of a polyether-based polyurethane foam provided in a packaging container.

Examples, comparative examples, preparation examples and test examples will now be described. The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

[Test Example 1] Performance measurement of polyurethane foam

To select polyurethane foams suitable for impregnation with W/O or O/W low-viscosity emulsion cosmetic compositions, the properties of various polyurethane foam types were measured. Tables 2 and 3 below show each type of polyurethane foam and its corresponding properties. Figures 3 and 4 are microscopic images of each type of polyurethane foam, magnified at 10 x 0.3.

[Table 2]

[Table 3]

In Table 3, polyether-based polyurethane foam 1 is a dry polyether-based polyurethane foam.

[Test Example 2] Evaluation of formulation stability

Among the various polyurethane foams listed in Tables 2 and 3, polyether-based polyurethane foam 1 (Example 1), polyester-based polyurethane foam 2 (Comparative Example 1), and polyester-based polyurethane foam 3 (Comparative Example 2) were selected and impregnated with the W/O emulsion cosmetic composition. Their stability over temperature and time was then evaluated. The results are shown in Table 4 and Figure 5 below. Figure 5 shows photographs of Example 1, Comparative Example 1, and Comparative Example 2 after they were stored at 50°C for 2 hours.

[Table 4]

As can be seen from the above results, each of the polyurethane foams according to Comparative Examples 1 and 2 broke when impregnated with the W/O type emulsion cosmetic composition, resulting in delamination and bubble generation over time under high temperatures or severe temperature fluctuations, thereby demonstrating significant instability. In contrast, Example 1 substantially maintained its original state and exhibited high stability.

Therefore, it can be seen that the polyether-polyurethane foam shows higher stability when impregnated with the cosmetic composition than the polyester-based polyurethane foam, and is more suitable for impregnation with the cosmetic composition.

[Preparation Examples 1 and 2] Preparation of UV protective cosmetic compositions

In Preparation Examples 1 and 2, W/O type emulsion UV protective cosmetic compositions were prepared according to the formula in Table 5 below:

Specifically, a UV protectant is introduced into the oily component, dissolved therein, and emulsified. Next, the oily component is mixed with a surfactant, heated to 80°C, and stirred at this temperature to homogenize the mixture. Then, a pigment is further added thereto, followed by stirring and homogenization, thereby providing an oily portion. In a separate mixer, the aqueous component is mixed, heated to 80°C, and stirred at this temperature to provide a completely dissolved aqueous portion. The prepared aqueous portion is gradually added to the oily portion and emulsified using a homogenizer. After cooling to 50°C, the skin protective ingredient and fragrance are added thereto, followed by cooling, thereby providing a low-viscosity W/O type emulsion UV protective cosmetic composition.

[Table 5]

In Table 5, disteardimonium hectorite acts as a thickener, polymethyl methacrylate is used as a pure bulk pigment, and titanium dioxide/aluminum hydroxide/stearic acid are used as inorganic UV protectants.

[Test Example 3] Evaluation of the preference depending on the hardness of polyurethane foam

Different types of polyether-based polyurethane foams with different hardness values were impregnated with Preparation Examples 1 and 2, and user preference was determined for each case. Specifically, 50 women were divided into two groups (25 people each). They were asked to apply each of Preparation Examples 1 and 2 impregnated with polyether-based polyurethane foams with different hardness values to their skin using an NBR puff over two days. Then, overall user preference, including hand feel and application quality, was evaluated for each case. The results are shown in Tables 6 and 7.

[Table 6]

[Table 7]

From the above results, it can be seen that when the Asker hardness value of the polyether-based polyurethane foam impregnated with the composition according to Preparation Examples 1 and 2 is 40, it is most preferable.

Those skilled in the art will appreciate that the concepts and specific embodiments disclosed in the foregoing description may be readily used as a basis for modifying or designing other embodiments to achieve the same goals as the present disclosure. Those skilled in the art will also appreciate that such equivalent embodiments will not depart from the spirit and scope of the present disclosure as defined by the appended claims.

Claims (3)

1. A cosmetic product comprising a polyurethane foam impregnated with a cosmetic composition, The polyurethane foam described therein has a network structure. The cosmetic composition described herein is a water-in-oil (W/O) emulsion cosmetic composition. The polyurethane foam described therein has a density of 1-3 pcf. The polyurethane foam described therein has a pore count of 70-120 pores per inch (ppi). The polyurethane foam described therein has an ASKER hardness of 10-70. The viscosity of the emulsion cosmetic composition is 5,000-15,000 cp. 2. A cosmetic product comprising a polyurethane foam impregnated with a cosmetic composition. The polyurethane foam described therein has an open-cell structure. The cosmetic composition described herein is a water-in-oil (W/O) emulsion cosmetic composition. The polyurethane foam described therein has a density of 1-3 pcf. The polyurethane foam described therein has a pore count of 70-120 pores per inch (ppi). The polyurethane foam described therein has an ASKER hardness of 10-70. The viscosity of the emulsion cosmetic composition is 5,000-15,000 cp. 3. The cosmetic according to claim 1 or 2, comprising a polyurethane foam impregnated with a cosmetic composition. The cosmetic composition is provided for use as a makeup primer, primer, foundation, powder, 2-in-1 powder, lipstick, lip balm, eyeshadow, eyebrow pencil, concealer, or blush.