Sweetener-containing lipstick with stable color

Abstract

The present invention relates to a cosmetic lipstick containing a combination of a) sodium saccharin (INCI: sodium saccharin) and b) citric acid (INCI: citric acid).

Description

Technical Field

[0001] This invention relates to a cosmetic lipstick comprising a combination of sodium saccharin (INCI: sodium saccharin) and citric acid (INCI: citric acid). Background Technology

[0002] For millennia, the desire for beauty and allure has been ingrained in the human psyche. Although standards of beauty have evolved over time, the pursuit of a flawless appearance remains a human goal, as a pleasing appearance can boost self-esteem and enhance one's attractiveness to peers.

[0003] The term "decorative cosmetics" originates from the Latin word "decoratio"—meaning an emphasis on beauty. In most cases, colorants are used to emphasize different parts of the body, especially the face, and to reduce uneven coloring.

[0004] In addition to powdered cosmetics such as face powder and blush, as well as stick formulations, emulsion-based cream formulations such as day creams and foundation creams are also used for this purpose.

[0005] Lipstick is one of the most commonly used decorative cosmetics. Over 50% of German women use lipstick. In addition to enhancing lip color, lipstick is also commonly used for lip care.

[0006] Lipsticks typically consist of a wax base incorporating high concentrations of liquid and semi-solid oils, as well as pigments and fillers. They are typically in the form of solid sticks.

[0007] Lipsticks face extremely high health and safety requirements because, during application and use, it's impossible to rule out the possibility that some parts of the formulation will come into contact with the mouth and / or be swallowed. Since some ingredients in lipsticks have an unpleasant inherent taste, masking this taste to make the lipstick more appealing to consumers is also crucial. Sweeteners are commonly used for this purpose. In principle, potentially usable sweeteners include sodium saccharin (INCI: sodium saccharin) and / or neohesperidin dihydrochalcone (INCI: neohesperidin dihydrochalcone).

[0008] However, a drawback of existing technology is that lipsticks containing sodium saccharin are prone to yellowing ("yellowing"). Formulations containing a combination of sodium saccharin and neohesperidin dihydrochalcone are prone to red or even brown discoloration. This effect is particularly pronounced at relatively high temperatures and over relatively long storage periods. Undesirable discoloration can occur if there is an unplanned delay in the heating phase during production, or if the lipstick is stored at relatively high temperatures (e.g., in summer). In some cases, the formulation must be completely discarded during production and disposed of at high cost. Summary of the Invention

[0009] Therefore, the object of the present invention is to develop lip balm formulations containing sweeteners that maintain color stability even under relatively high temperatures and relatively long storage periods (especially lip balm formulations containing sodium saccharin and / or neohesperidin dihydrochalcone).

[0010] Lipstick formulations typically contain one or more colored pigments because they are commonly used to color the skin of the lips.

[0011] One drawback of existing technology is that the combination of sweeteners (especially in the case of sodium saccharin and neohesperidin dihydrochalcone) with pigments can lead to uneven formulations. This can be observed during production: in formulations containing sweeteners, the pigments are no longer evenly distributed in the hot liquid rod-shaped material, but instead settle to the bottom. Therefore, it is no longer possible to cast rods with a uniform composition from this liquid rod-shaped material.

[0012] Therefore, the object of the present invention is to develop a lipstick formulation containing colored pigments and sweeteners, wherein the colored pigments can be uniformly incorporated into the formulation.

[0013] Surprisingly, these objectives are achieved through a cosmetic lipstick that contains the following combination:

[0014] a) Sodium saccharin (INCI: sodium saccharin), and

[0015] b) Citric acid (INCI: citric acid).

[0016] If the formulation contains water and / or glycerin, it is preferred according to the present invention.

[0017] Surprisingly, these objectives are also achieved through a method for producing cosmetic lipsticks, characterized by:

[0018] i) First, dissolve sodium saccharin (INCI: sodium saccharin) in water, and

[0019] ii) Dissolve citric acid (INCI: citric acid) in water in a separate container.

[0020] iii) The second step involves sequentially combining the two aqueous solutions with the fat, and

[0021] iv) Mix the combined solution with the remaining components of the formulation and homogenize.

[0022] Within the scope of this disclosure, unless otherwise stated, expressions such as "according to the invention," "advantageous according to the invention," etc., always refer to formulations and methods according to the invention.

[0023] Therefore, an advantageous embodiment of the invention is characterized in that, based on the total weight of the formulation, the lipstick formulation contains sodium saccharin at a concentration of 0.2% to 10% by weight.

[0024] If sodium saccharin is the only sweetener in the formulation, a concentration of less than 1.5% by weight is preferred according to the present invention, based on the total weight of the formulation.

[0025] It is also advantageous according to the invention if the lipstick formulation contains citric acid at a concentration of at least 0.05% by weight, based on the total weight of the formulation.

[0026] If sodium saccharin is the only sweetener in the formulation, a concentration of at least 0.25% by weight is preferred according to the present invention, based on the total weight of the formulation.

[0027] If the formulation contains neohesperidin dihydrochalcone and color pigments in addition to sodium saccharin, a citric acid concentration of at least 0.1% by weight is preferred according to the present invention based on the total weight of the formulation.

[0028] In addition to formulations containing sodium saccharin as the sole sweetener, a second embodiment of the invention is also advantageous, characterized in that the lipstick formulation further contains neohesperidin dihydrochalcone (INCI: neohesperidin dihydrochalcone).

[0029] In this case, it is advantageous according to the invention if the lipstick formulation also contains 0.1% to 5% by weight of neohesperidin dihydrochalcone (INCI: neohesperidin dihydrochalcone) based on the total weight of the formulation.

[0030] In this case, the method according to the invention is characterized in that, in step i), neohesperidin dihydrochalcone is dissolved together with sodium saccharin in a water / glycerol mixture.

[0031] In all cases, the invention is preferred if it is based on a water / glycerin mixture that does not contain more than 25% by weight of glycerin.

[0032] A further feature of the advantageous embodiments of the present invention is that the lipstick formulation comprises one or more colorants selected from the following: CI15850 (also known as Red 6, E180 or Lithol Red), CI42090 (also known as Blue 1, E133 or Brilliant Blue), CI77491 (also known as Titanium Dioxide, E-171), CI77499 and CI77492 (also known as Iron Oxide, E-172).

[0033] In this case, it is preferred according to the invention if the lipstick formulation contains a total concentration of 0.05% to 0.5% by weight of colorant based on the total weight of the formulation.

[0034] If the formulation contains CI15850 (also known as Red 6, E180 or Rissol Red) as the sole colorant, the compound is advantageously used at a concentration of 0.05% to 0.4% by weight according to the invention, based on the total weight of the formulation.

[0035] If the formulation contains a combination of CI15850 and CI42090, the preferred concentration of CI15850 according to the present invention is 0.05% to 0.4% by weight, based on the total weight of the formulation, and the preferred concentration of CI42090 according to the present invention is 0.02% to 0.15% by weight, based on the total weight of the formulation.

[0036] If the formulation contains CI77491, the compound is advantageously used at a concentration of 0.02% to 0.1% by weight according to the invention, based on the total weight of the formulation.

[0037] If the formulation contains CI77499, the compound is advantageously used at a concentration of 0.02% to 0.1% by weight according to the invention, based on the total weight of the formulation.

[0038] If the formulation contains CI77492, the compound is advantageously used at a concentration of 0.005% by weight to 0.05% by weight according to the invention, based on the total weight of the formulation.

[0039] In the context of this invention, it is advantageous if the lipstick formulation contains castor oil (INCI: castor (Ricinus Communis) seed oil).

[0040] According to the present invention, for the method according to the present invention, the pigment is particularly preferably pre-dispersed in the oil before being added to the formulation.

[0041] If, based on the total weight of the formulation, the formulation contains castor oil at a concentration of 18% to 25% by weight, then according to the present invention it is preferred.

[0042] A further feature of the advantageous embodiments of the present invention is that the lipstick formulation comprises shea butter (INCI: Butyrospermum Parkii) oil, sunflower oil (INCI: Helianthus Annuus blended oil) and / or beeswax (INCI: white beeswax) and sunflower wax (Helianthus Annuus seed wax).

[0043] If the formulation contains shea butter (INCI: shea butter resin), the compound is advantageously used at a concentration of 2% to 5% by weight according to the invention, based on the total weight of the formulation.

[0044] If the formulation contains sunflower oil (INCI: sunflower blended oil), the compound is advantageously used at a concentration of 45% to 55% by weight according to the invention, based on the total weight of the formulation.

[0045] If the formulation contains sunflower wax (sunflower seed wax), the compound is advantageously used at a concentration of 7% to 11% by weight according to the invention, based on the total weight of the formulation.

[0046] Furthermore, the advantageous lip care product according to the invention is characterized in that the formulation comprises cetyl palmitate, hydrogenated rapeseed oil (INCI: hydrogenated rapeseed oil), and / or cetearyl alcohol. Hydrogenated rapeseed oil is preferably used according to the invention.

[0047] For cetyl palmitate, the advantageous concentration according to the invention is 2% to 10% by weight, based on the total weight of the formulation.

[0048] For cetearyl alcohol, the advantageous concentration according to the invention is 5% to 15% by weight, based on the total weight of the formulation.

[0049] For hydrogenated rapeseed oil (INCI: hydrogenated rapeseed oil), the advantageous concentration according to the invention is 5% to 9% by weight, based on the total weight of the formulation.

[0050] Furthermore, if the lip care formulation contains butylated hydroxytoluene (BHT), it may be advantageous according to the invention. Based on the total weight of the formulation, the concentration of this substance used according to the invention is from 0.05% to 0.15% by weight.

[0051] Furthermore, it is advantageous according to the invention if the lipstick formulation contains tocopherol and / or ascorbyl palmitate. Tocopherol is particularly preferred. Based on the total weight of the formulation, the concentration of this substance used according to the invention is from 0.05% to 0.15% by weight.

[0052] Advantageously, according to the invention, the lipstick formulation according to the invention may contain one or more UV filters.

[0053] In this case, it is preferred according to the invention if the lipstick formulation contains 4-(tert-butyl)-4'-methoxydibenzoylmethane (INCI: butylmethoxydibenzoylmethane) and / or 2,4,6-tris[phenylamino-(p-carbonyl-2'-ethyl-1'-hexyloxy)]-1,3,5-triazine (INCI: ethylhexyltriazinone).

[0054] Last but not least, it is advantageous according to the invention if, based on the total weight of the formulation, the proportion of hydrophilic components in the lipstick formulation is less than 5% by weight. Hydrophilic components should be understood herein to refer to water and water-soluble compounds.

[0055] According to the invention, in order to disperse these components, polyglycerol esters (e.g., polyglycerol-3 diisostearate or polyglycerol-4 diisostearate / polyhydroxystearate / sepiacetate) are advantageously added to the formulations according to the invention. Polyglycerol-4 diisostearate / polyhydroxystearate / sepiacetate is preferred according to the invention.

[0056] Based on the total weight of the formulation, the preferred concentration of polyglycerol-4 diisostearate / polyhydroxystearate / sepiacetate according to the present invention is 1.5% to 2.5% by weight.

[0057] Last but not least, the present invention provides the use of citric acid (INCI: citric acid) in cosmetic lipsticks or methods, such as those described in this disclosure, for improving the color stability and / or emulsion stability of the formulation. Detailed Implementation

[0058] Comparative experiment

[0059] The following formulations were prepared, and their appearance was determined by optical methods. All concentrations used are weight percentages based on the total weight of the formulation.

[0060] All LAB values ​​given below were measured using a HunterLab ColorFlex EZ colorimeter on the prepared lip care stick. The lip care stick was slightly unscrewed from the device and inverted over the measurement opening.

[0061]

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[0065]

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[0067]

[0068] The Lab values ​​of Examples 16-21 show that as the concentration of citric acid increases, the values ​​of a and b continuously decrease, resulting in a color shift towards the blue-green region. The color obtained in this way is optically preferred compared to the original color without added citric acid.

[0069]

[0070] Examples 22-23 show that as the concentration of citric acid increases, the values ​​of a and b continuously increase, resulting in a color shift towards reddish-yellow. Similarly, the color obtained after adding citric acid is optically preferred. Example

[0071] The following examples are intended to illustrate the invention, not to limit it. Unless otherwise stated, all amounts, proportions, and percentages are based on weight and total amount or on the total weight of the formulation.

[0072]

Claims

1. A cosmetic lipstick comprising the following components a) Sodium saccharin (INCI: sodium saccharin), and b) Citric acid (INCI: citric acid).

2. The cosmetic lipstick according to claim 1, characterized in that, The formulation contains water and / or glycerin.

3. A method for producing cosmetic lipstick, characterized in that... i) First, dissolve sodium saccharin (INCI: sodium saccharin) in water, and ii) Dissolve citric acid (INCI: citric acid) in water in a separate container. iii) The second step involves sequentially combining the two aqueous solutions with the fat, and... iv) Mix the combined solution with the remaining components of the formulation and homogenize.

4. The lipstick according to claim 1 or 2, or the method according to claim 3, characterized in that, Based on the total weight of the formulation, the lipstick formulation contains sodium saccharin at a concentration of 0.2% to 10% by weight.

5. The lipstick or method according to any one of the preceding claims, characterized in that, Based on the total weight of the formulation, the lipstick formulation contains citric acid at a concentration of at least 0.05% by weight.

6. The lipstick or method according to any one of the preceding claims, characterized in that, The lipstick formulation also contains neohesperidin dihydrochalcone (INCI: neohesperidin dihydrochalcone).

7. The lipstick or method according to any one of the preceding claims, characterized in that, Based on the total weight of the formulation, the lipstick formulation also contains 0.1% to 5% by weight of neohesperidin dihydrochalcone (INCI: neohesperidin dihydrochalcone).

8. The method according to any one of the preceding claims, characterized in that, In step i), neohesperidin dihydrochalcone is dissolved together with sodium saccharin in a water / glycerol mixture.

9. The method according to claim 8, characterized in that, Based on the water / glycerin mixture, which does not contain more than 25% by weight of glycerin.

10. The lipstick or method according to any one of the preceding claims, characterized in that, The lipstick formulation contains one or more colorants selected from the following: CI15850 (also known as Red 6, E180 or Lisol Red), CI42090 (also known as Blue 1, E133 or Brilliant Blue), CI77491 (also known as Titanium Dioxide, E-171), CI77499 and CI77492 (also known as Iron Oxide, E-172).

11. The lipstick or method according to claim 10, characterized in that, Based on the total weight of the formulation, the lipstick formulation contains a total concentration of 0.05% to 0.5% by weight of colorant.

12. The lipstick or method according to any one of the preceding claims, characterized in that, The lipstick formulation contains castor oil (INCI: castor (Ricinus Communis) seed oil).

13. The lipstick or method according to any one of the preceding claims, characterized in that, The lipstick formulation contains shea butter (INCI: Butyrospermum Parkii), sunflower oil (INCI: Helianthus Annuus blended oil) and / or beeswax (INCI: white beeswax) and sunflower wax (Helianthus Annuus seed wax).

14. The lipstick or method according to any one of the preceding claims, characterized in that, The lipstick formulation contains tocopherol and / or ascorbyl palmitate.

15. The lipstick or method according to any one of the preceding claims, characterized in that, The lipstick formulation contains 4-(tert-butyl)-4'-methoxydibenzoylmethane (INCI: butylmethoxydibenzoylmethane) and / or 2,4,6-tris[phenylamino-(p-carbonyl-2'-ethyl-1'-hexyloxy)]-1,3,5-triazine (INCI: ethylhexyltriazinone).

16. The lipstick or method according to any one of the preceding claims, characterized in that, Based on the total weight of the formulation, the lipstick formulation contains less than 5% by weight of a hydrophilic ingredient.

17. The lipstick or method according to any one of the preceding claims, characterized in that, The lipstick formulation contains polyglycerol-3 diisostearate or polyglycerol-4 diisostearate / polyhydroxystearate / sebacate.

18. Use of citric acid (INCI: citric acid) in any cosmetic lipstick or method according to any one of claims 1 to 17 for improving the color stability and / or emulsion stability of the formulation.

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