Hair removal wax

Abstract

To provide a novel hair removal wax having excellent hair removal performance.SOLUTION: A hair removal wax composition contains petroleum resin and petroleum natural wax. The ratio of (η(0.65) / η(65)) is about 3.5 or less where η(0.65) is a melt viscosity measured at a shear rate of 0.65 sec-1 and η(65) is a melt viscosity measured at a shear rate of 65 sec-1 30 minutes after the composition is once melted at 70°C or higher and then cooled to 60°C.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a novel depilatory wax, a method for producing the same, and a method for depilating using the novel depilatory wax. [Background technology]

[0002] Generally, hair removal wax, also known as Brazilian wax, is made with rosin (a derivative of abietic acid from pine resin) as the main ingredient to provide adhesiveness, and is mixed with oils and fats such as mineral oil, paraffin wax, and lanolin to provide film strength and flexibility, as well as pigments such as titanium oxide and fragrances. The melted hair removal wax is applied to the area to be depilated with a spatula, etc., and the wax is allowed to entangle the hair and then solidify, and the wax is quickly peeled off to remove the hair.

[0003] However, it is known that rosin has skin sensitizing properties and can cause allergies when used as a main ingredient. Therefore, waxes with as little rosin as possible were desired, but reducing the amount of rosin used resulted in a problem of reduced adhesion to hair and poor hair removal performance.

[0004] In the past, it was proposed to use wax made from C5 petroleum resin obtained by pyrolysis of petroleum naphtha, as in Patent Document 1, and to add an appropriate amount of solid oil to improve film-forming and peeling properties. However, there was a problem with the hair removal performance because it was difficult to achieve a balance between the adhesive strength to the hair and the film strength of the wax. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Special Publication No. 5-2645 Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to provide a novel depilatory wax having excellent depilatory performance. [Means for solving the problem]

[0007] As a result of extensive research, the present inventors discovered that the shear rate dependency of the melt viscosity of a solid wax obtained by melting and mixing appropriate amounts of petroleum resin and petroleum-based natural wax and then cooling the solid wax becomes small when the temperature is first raised to about 70°C in a heating device to melt the wax and then cooled to a temperature close to the application temperature of 55 to 60°C, thereby completing the present invention.

[0008] The present invention provides the following:

[0009] (Item 1) A depilatory wax composition containing a petroleum resin and a petroleum-based natural wax, the composition is melted at 70°C or higher, cooled to 60°C, and then dried for 30 minutes at 0.65 sec. -1 The melt viscosity (η(0.65)) measured at a shear rate of 65sec -1 1. A depilatory wax composition, characterized in that the ratio (η(0.65) / η(65)) of melt viscosities (η(65)) measured at a shear rate of about 3.5 or less.

[0010] (Item 2) 2. The depilatory wax composition according to item 1, wherein the petroleum resin is a C5 petroleum resin, a C5 / C9 copolymer resin, or a C5 / C9 blend resin, and the depilatory wax composition comprises about 50% to about 85% by weight of the petroleum resin.

[0011] (Item 3) 3. The depilatory wax composition according to item 1 or 2, wherein the petroleum-based natural wax is a microcrystalline wax and the composition contains about 3 to about 15% by weight of the microcrystalline wax.

[0012] (Item 4) 4. The depilatory wax composition according to any one of items 1 to 3, further comprising about 1% by weight to about 10% by weight of an ethylene-vinyl acetate copolymer resin.

[0013] (Item 5) A method for hair removal comprising the steps of: a. A step of heating the depilatory wax composition according to any one of items 1 to 4 to a temperature of about 70° C. or higher to melt it; a step of lowering the temperature of the molten depilatory wax composition in step b to a temperature of about 55 to 60°C; c. applying the cooled depilatory wax composition to the area to be depilated and entangling the hair; d. A step of allowing the applied depilatory wax composition to solidify and then peeling it off to remove hair. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] The present invention will be described in detail below. Throughout this specification, the singular expression should be understood to include the concept of the plural form, unless otherwise specified. Therefore, the singular article (for example, in the case of English, "a", "an", "the", etc.) should be understood to include the concept of the plural form, unless otherwise specified. In addition, it should be understood that the terms used in this specification are used in the sense commonly used in the field, unless otherwise specified. Therefore, unless otherwise defined, all technical terms and scientific and technical terms used in this specification have the same meaning as commonly understood by those skilled in the art to which this invention belongs. In case of conflict, this specification (including definitions) shall prevail.

[0015] (definition) Below, the definitions of terms particularly used in this specification and / or basic technical contents will be explained as appropriate.

[0016] In this specification, the word "comprise" includes the meanings "essentially consist of" and "consist of."

[0017] In this specification, "about" means ±10% of the preceding numerical value.

[0018] (Wax composition) The main component of the depilatory wax of the present invention is a petroleum resin. The petroleum resin used in the depilatory wax of the present invention may be an aliphatic (C5) petroleum resin, an aromatic (C9) petroleum resin, an aliphatic / aromatic (C5 / C9) copolymerized petroleum resin, a blended resin of an aliphatic (C5) and an aromatic (C9) system, or a hydrogenated product thereof. In a preferred embodiment, the petroleum resin used in the present invention is a resin containing a C5 petroleum resin obtained by polymerizing a C5 (carbon number 5) petroleum hydrocarbon, which has a structural unit based on a C5 petroleum hydrocarbon. The C5 petroleum hydrocarbon refers to a C5 fraction (a fraction with a carbon number of 5) obtained by thermal cracking of naphtha, and specifically includes diolefins such as isoprene, 1,3-pentadiene, dicyclopentadiene, and piperylene, and monoolefins such as 2-methyl-1-butene, 2-methyl-2-butene, and cyclopentene. The main component of the C9 petroleum resin may be a copolymer of styrene, vinyltoluene, α-methylstyrene, indene, etc. In another preferred embodiment, the petroleum resin used in the present invention may be a C5 resin, a C5 / C9 copolymer resin, or a C5 / C9 blend resin. The petroleum resin used in the present invention may be, for example, Quinton (Zeon), Imave (Idemitsu Kosan), Alcon (Arakawa Chemical), etc., but is not limited thereto. The depilatory wax of the present invention contains petroleum resin (preferably C5 or C5 / C9 petroleum resin) in an amount of about 50% by weight or more, about 60% by weight or more, more preferably about 65% by weight or more. The depilatory wax of the present invention may contain petroleum resin (preferably C5 or C5 / C9 petroleum resin) in an amount of about 50% to about 95% by weight, about 50% to about 90% by weight, about 50% to about 85% by weight, about 60% to about 95% by weight, about 60% to about 90% by weight, about 60% to about 85% by weight, about 65% to about 95% by weight, about 65% to about 90% by weight, or about 65% to about 85% by weight. Preferably, the depilatory wax of the present invention may contain petroleum resin (preferably C5 or C5 / C9 petroleum resin) in an amount of about 50% to about 85% by weight.

[0019] The depilatory wax of the present invention contains a petroleum-based natural wax. As the petroleum-based natural wax, at least one or more selected from Vaseline, paraffin wax, and microcrystalline wax are used. It is known that these waxes have different properties based on their molecular structures. Vaseline has a wide melting point range of about 36 to 60°C, and most paraffin waxes have a melting point of about 40 to 70°C. Microcrystalline wax is a petroleum-based wax with 31 to 70 carbon atoms, mainly composed of isoparaffin and cycloparaffin, and has a melting point in the range of about 60°C to 90°C. Commercially available microcrystalline wax products include the Hi-Mic (Nippon Seiro) series. From the viewpoint of adhesion to hair, the depilatory wax of the present invention preferably contains a microcrystalline wax. The depilatory wax of the present invention contains about 1% by weight or more, more preferably about 3% by weight or more, of a petroleum-based wax (preferably microcrystalline wax). The depilatory wax of the present invention may contain about 1% to about 20% by weight, about 1% to about 18% by weight, about 1% to about 15% by weight, about 3% to about 20% by weight, about 3% to about 18% by weight, or about 3% to about 15% by weight of petroleum-based wax (preferably microcrystalline wax). Preferably, the depilatory wax of the present invention may contain about 3% to about 15% by weight of petroleum-based wax (preferably microcrystalline wax).

[0020] In a preferred embodiment, the depilatory wax of the present invention may contain ethylene vinyl acetate copolymer resin (EVA). The ethylene vinyl acetate copolymer resin may contribute to adhesion to hair. The ethylene vinyl acetate copolymer resin preferably has a vinyl acetate content in the range of about 15 to about 35% by weight, and commercially available products include Evaflex (Mitsui DuPont Polychemicals) and Sumitate (Sumitomo Chemical). The depilatory wax of the present invention may contain about 1% to about 20% by weight, more preferably about 1% to about 10% by weight, of ethylene vinyl acetate polymer.

[0021] The depilatory wax of the present invention may also contain other oils and fats to improve film properties and skin irritation, including, but not limited to, mineral oil, beeswax, lanolin, rice bran oil, etc. The depilatory wax of the present invention may also contain a small amount of rosin to increase adhesion to hair, provided that this does not impair safety.

[0022] The depilatory wax of the present invention may further contain inorganic powders such as titanium oxide, talc, kaolin, and mica in order to improve film-forming properties and peelability from the skin, and may also contain ingredients such as fragrances, colorants, and medicines.

[0023] The depilatory wax of the present invention can be produced by heating each component, such as a petroleum resin (eg, C5 petroleum resin) and a petroleum wax (microcrystalline wax), to 100° C. or higher, melt mixing, and then cooling.

[0024] The present inventors have found that the shear rate dependency of the melt viscosity is small when the depilatory wax of the present invention is melted by first raising the temperature to about 70° C. or higher, typically about 70° C. to 85° C. in a heating device, and then lowering the temperature to a temperature close to the usage temperature of about 55 to about 60° C. The depilatory wax can be heated and melted using any known device, and the temperature is typically cooled to about 55 to about 60° C. by dissipating heat into the air, but the temperature may also be lowered by applying cold air.

[0025] The depilatory wax of the present invention does not necessarily have the effect of reducing the shear rate dependency of the melt viscosity simply by heating to about 55 to about 60°C without first heating to about 70°C or higher. In addition, the depilatory wax of the present invention, once heated to about 70°C or higher, cooled and solidified, must be heated again to about 70°C or higher before use and then cooled to about 55 to about 60°C in order to similarly reduce the shear rate dependency of the melt viscosity.

[0026] The depilatory wax of the present invention is melted by first heating the solid wax to 70°C, then cooling it to 60°C and heating it for 30 minutes at a shear rate of 0.65 sec. -1 Melt viscosity η(0.65) measured at 65sec -1 The wax is characterized by a small difference between the melt viscosity η(65) measured by the shear rate. If the viscosity of the wax is highly dependent on the shear rate, the viscosity is small when the wax is stirred quickly, and is high when the wax is stirred slowly or applied. For example, when the wax is stirred after melting and left to stand, if the viscosity is highly dependent on the shear rate, the wax surface will rise and become lumpy, but if the viscosity is less dependent on the shear rate, the wax will quickly become flat and homogeneous. In addition, if the viscosity of the wax is highly dependent on the shear rate, the viscosity of the wax will change depending on the speed of the spatula when applying it to the hair removal area, which will greatly change the amount of wax applied, but if the viscosity of the wax is less dependent on the shear rate, the viscosity will not change much depending on the speed of the spatula, so the wax can be applied uniformly to the hair removal area and the degree of entanglement with the hair will also be uniform. Specifically, η(0.65) / η(65) is about 3.5 or less, about 3.0 or less, or about 2.5 or less, and preferably about 2.0 or less.

[0027] The reason why the depilatory wax of the present invention exhibits such behavior is unclear, and it is not intended to be bound by theory, but it is believed that the melting point of each component in the composition, the compatibility of the components in the molten state, the crystal precipitation speed and crystal size during cooling, etc., all have an overall effect.The depilatory wax of the present invention has a small change in melt viscosity depending on the speed at which the molten wax in the heating device is stirred and scooped up with a spatula, etc., so it can always scoop up a constant amount, and can be applied uniformly with almost constant viscosity regardless of the speed at which the wax is spread on the depilatory area.Therefore, when used, the wax is firmly entangled to the root of the hair, and as a result, it shows high adhesion to hair after solidification, and has the excellent effect of showing excellent depilatory performance.

[0028] (How to use) The depilatory wax of the present invention can be used for depilation of any part of the human body, including the face, chest, arms, legs, nose, armpits, and delicate areas.

[0029] The depilatory wax of the present invention is first heated to about 70°C or higher (generally about 70°C to about 85°C) before use to melt it. The depilatory wax can be heated and melted using any known device. The temperature is then lowered to 55-60°C, and the wax is scooped up with a tool such as a spatula and applied to the area to be depilated. In this way, the molten depilatory wax is evenly entangled with the hair, and then the wax solidifies as the temperature drops, and can be quickly peeled off to efficiently depilate the hair.

[0030] The present invention also provides a method for providing a depilatory wax composition suitable for depilation in a depilation method, which may include the steps of once heating the depilatory wax of the present invention to about 70° C. or higher (generally about 70° C. to about 85° C.) and melting it, and cooling the melted depilatory wax to a temperature of about 55 to 60° C. The depilatory wax thus provided is applied to the area to be depilated with a spatula or the like, entangled with the hair, and the applied depilatory wax composition is allowed to solidify and then peeled off, thereby enabling depilation.

[0031] The various embodiments described above can be combined to provide further embodiments.Those skilled in the art can make any appropriate modifications to the embodiments in light of the above detailed description.In general, the terms used in the appended claims should not be interpreted to limit the claims to the specific embodiments disclosed in the specification, but should be interpreted to include all possible embodiments and the full scope of equivalents to which such claims are entitled.Therefore, the claims are not limited by this disclosure. EXAMPLES

[0032] The components shown in Table 1 below were heated to 100-120° C., melt-mixed with stirring, and then cooled to room temperature to solidify, thereby obtaining the depilatory waxes of Examples 1-6 and Comparative Examples 1-4.

[0033] [Table 1]

[0034] In Table 1, Quinton B170 and Quinton N180 (both manufactured by Zeon Corporation) were used for petroleum resins A and B, respectively. Both Quinton B170 and Quinton N180 are petroleum resins manufactured using high-purity 1,3-pentadiene extracted from C5 fraction as the main raw material, with Quinton B170 being an aliphatic petroleum resin and Quinton N180 being an aliphatic / aromatic resin further copolymerized with C9 aromatics. Petroleum resin C is Imab S-100 (Idemitsu Kosan), a dicyclopentadiene / aromatic copolymer-based hydrogenated type.

[0035] Microcrystalline waxes A to D are from the Hi-Mic series of Nippon Seiro. Microcrystalline wax A is Hi-Mic 2045 (viscosity 8.2 mm at 100°C). 2 / s), microcrystalline wax B is Hi-Mic2065 (viscosity at 100°C 8.2mm 2 / s), Microcrystalline Wax C is Hi-Mic1045 (viscosity at 100°C 15.8mm 2 / s), Microcrystalline Wax A is Hi-Mic1090 (viscosity at 100°C 14.3mm 2 / s).

[0036] Ethylene-vinyl acetate copolymer resins (EVA) A to D are each from Mitsui DuPont Chemical's Evaflex series, with ethylene-vinyl acetate copolymer resin A being Evaflex EV205WR (vinyl acetate 28% by weight, melt flow rate (MFR) 800g / 10min), ethylene-vinyl acetate copolymer resin B being Evaflex EV220 (vinyl acetate 28% by weight, MFR 150g / 10min), ethylene-vinyl acetate copolymer resin C being Evaflex V5774ETWR (vinyl acetate 33% by weight, MFR 700g / 10min), and ethylene-vinyl acetate copolymer resin D being Evaflex EV210 (vinyl acetate 28% by weight, MFR 400g / 10min).

[0037] Paraffin wax A and B used were Paraffin Wax 155 and Paraffin Wax 120 manufactured by Nippon Seiro, lanolin used was refined lanolin manufactured by Nikko Pharmaceuticals, and rice bran oil used was manufactured by Oryza Oil Chemical.

[0038] The titanium oxide used was TITONE R-24S from Sakai Chemical Industry.

[0039] The melt viscosity was measured by first heating the solid state depilatory wax of Examples 1 to 6 and Comparative Examples 1 to 4 to 70°C, melting it, then cooling it to 60°C and measuring it 30 minutes later at shear rates of 0.65 sec-1 and 65 sec-1, and calculating the ratio of the obtained melt viscosities η(0.65) to η(65) (η(0.65) / η(65)) (measuring device: UBM Rheosol-G1000, 25 mm diameter parallel plate).

[0040] Furthermore, the depilatory performance of the depilatory waxes of Examples 1 to 6 and Comparative Examples 1 to 4 was evaluated by a panel of 10 adult males. The wax was once melted at 70°C or higher, then cooled to 55 to 60°C and applied with a spatula in the direction of the flow of leg hair, and the uniformity of the coating and the degree of entanglement with the hair were evaluated. Next, when the wax solidified, it was peeled off in one go in the opposite direction to the flow of the hair to evaluate the depilatory condition. The results are shown in the table below. The evaluation score of the panel test was the average of the 10 panelists' 5-point evaluation.

[0041] [Table 2]

[0042] Furthermore, the solid-state depilatory waxes of Examples 1-6 and Comparative Examples 1-4 were heated directly from room temperature to 60°C without first heating to 70°C, and 30 minutes later, the shear rates were measured at 0.65sec-1 and 65sec-1, and the ratios of the melt viscosities η(0.65) and η(65) (η(0.65) / η(65)) were calculated (measuring device: UBM Rheosol-G1000, 25mm diameter parallel plate). The results are summarized in Table 3.

[0043] [Table 3]

[0044] Since hair removal wax is generally used after being heated and then cooled, the melt viscosity ratio when it is heated to 70°C and then cooled is important. For example, the melt viscosity ratio η(0.65) / η(65) of the wax of Comparative Example 3 is 3.0 after heating from room temperature, but η(0.65) / η(65) is 7.3 after cooling from 70°C, making such wax difficult to use in practice. The behavior of the melt viscosity ratio η(0.65) / η(65) of each wax was confirmed to be reproducible even when it was melted once, cooled, solidified, and then melted again. [Industrial Applicability]

[0045] According to the present invention, there is provided a novel depilatory wax composition which has excellent viscosity stability when heated and melted, easily entangles hair when spread over the area to be depilated, and exerts excellent depilatory power when peeled off after solidifying in the applied state, and a depilatory method using said composition.

Claims

1. A depilatory wax composition comprising a petroleum resin and a petroleum-based natural wax, the composition being melted at 70°C or higher, cooled to 60°C, and then cooled for 30 minutes at 0.65 sec. －１ The melt viscosity (η(0.65)) measured at a shear rate of 65 sec －１ The ratio (η(0.65) / η(65)) of melt viscosities (η(65)) measured at a shear rate of 3.5 or less, the petroleum resin is a C5 petroleum resin, a C5 / C9 copolymer resin, or a C5 / C9 blend resin, and the depilatory wax composition comprises 50% to 85% by weight of the petroleum resin; The petroleum-based natural wax is a microcrystalline wax, and the depilatory wax composition contains 3 to 15% by weight of the microcrystalline wax.

2. The depilatory wax composition described in claim 1, further containing 1% to 10% by weight of ethylene-vinyl acetate copolymer resin.

3. A method for producing a depilatory wax composition, comprising: A step of melting and mixing the petroleum resin and the petroleum-based natural wax, and then cooling and solidifying the mixture; a step of melting the mixture at 70° C. or higher, lowering the temperature to 60° C., and then measuring the melt viscosity (η(0.65)) at a shear rate of 0.65 sec −1 and the melt viscosity at a shear rate of 65 sec −1 30 minutes after the melting; a step of forming said depilatory wax composition when the ratio (η(0.65) / η(65)) of said melt viscosity (η(65)) is 3.5 or less; Inclusive of the petroleum resin is a C5 petroleum resin, a C5 / C9 copolymer resin, or a C5 / C9 blend resin, and the depilatory wax composition comprises 50% to 85% by weight of the petroleum resin; The petroleum-based natural wax is a microcrystalline wax, and the production method comprises 3 to 15% by weight of the microcrystalline wax.

4. The manufacturing method described in claim 3, wherein the depilatory wax composition further contains 1% to 10% by weight of ethylene-vinyl acetate copolymer resin.

5. A hair removal method comprising the steps of: a. A step of heating the depilatory wax composition according to any one of claims 1 or 2 to 70°C or higher to melt it; b. cooling the melted depilatory wax composition in step a to a temperature of 55-60°C; c. applying the cooled depilatory wax composition to the area to be depilated and entangling the hair; d) A step of allowing the applied depilatory wax composition to solidify and then peeling it off to remove hair.

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