Emulsion composition and cosmetic product including the composition

Abstract

Provided is an emulsion composition that includes a high-viscosity polyorganosiloxane in a large amount. The emulsion composition has a low viscosity, is easy to handle, and is less likely to cause a decrease in viscosity even when it is mixed in a large amount in a high-viscosity cosmetic such as a high-viscosity treatment agent. The emulsion composition includes, relative to 100% by mass of the emulsion composition, a component (A), a polyorganosiloxane mixture contained in an amount of 65% by mass to 90% by mass, and that has a viscosity of 100 Pa·s or more; a component (B), a surfactant contained in an amount of 2% by mass to 6% by mass; and a component (C), water contained in an amount of 5% by mass to 34% by mass.

Description

[0001] WA12423S 1

[0002] EMULSION COMPOSITION AND COSMETIC PRODUCT INCLUDING THE COMPOSITION

[0003] Technical Field

[0004]

[0001] The present invention relates to an emulsion composition and a cosmetic product including the composition. Background Art

[0005]

[0002] In order to obtain a superior conditioning effect, formulations in which a large amount of a highly polymerized silicone is added into hair cosmetics have been proliferating in recent years. Since the silicone emulsion contains a large amount of water, there is a problem that, when a large amount of the silicone emulsion is added into a treatment agent, the viscosity of the treatment agent is reduced. An emulsion that contains a large amount of silicone can have a reduced water content. However, when the emulsion contains a large amount of silicone, the viscosity of the emulsion increases, making it difficult to handle the emulsion during production.

[0006]

[0003] Patent Literature 1 discloses an organosilicone emulsion composition that has improved emulsion stability when using a high-viscosity polyorganosiloxane and a polyether group-containing organosiloxysilicate in combination. As the use application, Patent Literature 1 only mentions the use as a surface coating agent for various base materials, a release agent, a lubricant, a polishing agent, and the like. WA12423S 2

[0007]

[0004] Patent Literature 2 discloses an oil-in-water emulsion composition for hair cosmetics, which contains a polyorganosiloxane as an oily component and has excellent storage stability. However, the employed oils have different viscosity ranges from those of the oils employed in the present invention and Patent Literature 2 mentions the stability of the emulsion. However, there is no description relating to viscosity reduction of treatment agents.

[0008]

[0005] Patent Literature 3 discloses a hair care product that includes an oil-in-water emulsion A and an oil-in-water emulsion C. Patent Literature 4 discloses an oil-in-water silicone emulsion composition that can be used as a raw material for hair cosmetics, such as shampoos and rinses, and for skin cosmetics, such as creams and milky lotions, and that can also be used as pharmaceutical bases of ointments and the like. Patent Literatures 3 and 4 disclose examples of emulsions that contain a small amount of silicone.

[0009] Citation List

[0010] Patent Literature

[0011]

[0006] PTL 1: Japanese Patent No. 6233037

[0012]

[0007] PTL 2: Japanese Patent Application Laid-Open No.

[0013] 2012-077282

[0014]

[0008] PTL 3: Japanese Translation of PCT Patent Application Publication No. 2017-519005 (corresponding to WO2015 / 188325 ) WA12423S 3

[0015]

[0009] PTL 4: Japanese Patent Application Laid-Open No. Hei. 11-140317

[0016] Summary of Invention

[0017] Technical Problem

[0018]

[0010] The present invention provides an emulsion composition that includes a high-viscosity polyorganosiloxane in a large amount. The emulsion composition has a low viscosity, is easy to handle, and is less likely to cause a viscosity decrease even when a large amount thereof is added into a high-viscosity cosmetic such as a high-viscosity treatment agent.

[0019] Solution to Problem

[0020]

[0011] The emulsion composition of the present invention includes, relative to 100% by mass of the emulsion composition,

[0021] a component (A) that is a polyorganosiloxane mixture contained in an amount of 65% by mass to 90% by mass, and that has a viscosity of 100 Pa·s or more;

[0022] a component (B) that is a surfactant contained in an amount of 2% by mass to 6% by mass; and

[0023] a component (C) that is water contained in an amount of 5% by mass to 34% by mass,

[0024] wherein:

[0025] the component (A) contains (or contains only):

[0026] a component (A-l ) that includes one or more (low- WA12423S 4

[0027] viscosity) polyorganosiloxanes, having a viscosity, at 25°C, of 2 to 100 mPa·s, contained in an amount of 95 to 5 parts by mass relative to 100 parts by mass of the polyorganosiloxane mixture, and

[0028] a component (A-2 ) that is a (high-viscosity) polyorganosiloxane, having a viscosity, at 25°C, of 1 x 104to 1 x 108mPa·s, contained in an amount of 5 to 95 parts by mass relative to 100 parts by mass of the polyorganosiloxane mixture.

[0029]

[0012] The amount of the high-viscosity polyorganosiloxane as the component (A-2) may be 40 to 70 parts by mass, preferably 45 to 65 parts by mass, and more preferably 50 to 60 parts by mass, relative to 100 parts by mass of the low-viscosity polyorganosiloxane as the component (A-l).

[0030] When the amount of the high-viscosity polyorganosiloxane exceeds 70 parts by mass, the viscosity becomes too high. As a result, the mechanical force for emulsification may become insufficient, resulting in insufficient emulsification. On the other hand, when the amount of the high-viscosity polyorganosiloxane is less than 40 parts by mass, the conditioning power of the resulting emulsion composition is insufficient.

[0031]

[0013] The polyorganosiloxanes of the components (A-l ) and (A-2) may be represented by the following formula ( 1 ):

[0032] R1aSiO( 4-a ) / 2… ( 1 ) WA12423S 5

[0033] (In the formula ( 1 ), R1s each are an unsubstituted or substituted monovalent hydrocarbon group having 1 to 20 carbon atoms, or a hydroxyl group, and a is 1.7 to 2.3.).

[0034]

[0014] The surfactant of the component (B) preferably includes, relative to 100% by mass of the emulsion composition:

[0035] a component (B-l ) that includes one or more nonionic surfactants contained in an amount of 2% by mass to 6% by mass, or

[0036] a component (B-2 ) that is a polyoxyethylene hydrogenated castor oil ester or polyoxyethylene hydrogenated castor oil ether contained in an amount of 2% by mass to 6% by mass.

[0037]

[0015] The nonionic surfactant of the component (B-l ) may be represented by the following formula (2 ):

[0038] A / OH

[0039]

[0040] < O b

[0041] R2(OC2H4)bOH … (2)

[0042] (in the formula, R2is an alkyl group having 15 or more carbon atoms, and b is 17 or less).

[0043]

[0016] The polyoxyethylene hydrogenated castor oil ester or polyoxyethylene hydrogenated castor oil ether as the component (B-2) may be represented by the following formula WA12423S 6

[0044] O O — (CH2CH2O)XH

[0045] CH2 — O - (CH2CH2O)I - C(CH2)1OCH(CH2)5CH3

[0046] O O — (CH2CH2O)yH

[0047] CH 0 - (CH2CH2O)m - C(CH2)1OCH(CH2)5CH3

[0048] O O — (CH2CH2O)ZH

[0049]

[0050] CH2 — O - (CH2CH2O)n - C(CH2)1OCH(CH2)5CH3

[0051] ... ( 3 )

[0052] in the formula x + y + z + l + m + n is 60 to 300, 1

[0053]

[0054] 0, m 0

[0055]

[0056] , and n 0.

[0057]

[0017] The emulsion composition may also include a component ( D) that is an emulsi fication aid contained in an amount of 2 % by mass to 15% by mass relative to 100% by mass of the emulsion composition.

[0058]

[0018] The emulsi fication aid may be composed of any one or more compounds represented by the following formulas ( 4. 1 ) to ( 7 ).

[0059] C3H8O3( 4. 1 )

[0060] Molecular weight: 92. 09

[0061]

[0062] OH OH OH

[0063] ( 4. 2 )

[0064]

[0019] 1, 3-butylene glycol

[0065] C4H10O2 ( 5. 1 )

[0066] Molecular weight: 90. 1 WA12423S 7

[0067] ( 5. 2 )

[0068]

[0020] Diglycerin C6H14O5 ( 6. 1 )

[0069] ( 6. 2 )

[0070]

[0021] Propylene glycol C3H8O2( 7. 1 ) Molecular weight: 76. 09

[0071]

[0072] ( 7. 2 )

[0073]

[0022] The viscosity of the emulsion composition may meet any of the following conditions:

[0074] 25, 000 mPa·s or less at 25°C and a shear rate of 4 ( 1 / s ); 5, 000 to 15, 000 mPa·s at 25°C and a shear rate of 10 ( 1 / s ); and

[0075] 2, 000 to 10, 000 mPa·s at 25°C and a shear rate of 20 ( 1 / s ). WA12423S 8

[0076] When the emulsion composition meets any of the above-mentioned conditions, the manufacturability of the emulsion becomes better, and the handleability and stability of the emulsion composition when added into cosmetics are improved.

[0077]

[0023] The emulsion composition may be an emulsion composition for cosmetic products.

[0078] The viscosity of cosmetic products containing the emulsion composition is higher than the viscosity of cosmetic products that do not contain the emulsion composition, and the former viscosity is preferably 1.1 times or more, more preferably 1.2 times or more, the viscosity of the emulsion composition-free cosmetic products. The upper limit of the viscosity varies depending on the limitation of the use state, and is, for example, 2 times or less, 2.1 times or less, 2.2 times or less, 2.5 times or less, 3 times or less, the viscosity of the emulsion composition-free cosmetic products.

[0079]

[0024] The emulsion composition is preferably mixed in hair conditioners.

[0080] The concept of hair conditioners includes rinses, hair conditioners, hair treatments, and the like. Rinses and conditioners repair the cuticle on the hair surface to provide smoothness. Hair masks are a kind of treatment agent and are excellent in providing damage care from the inside to the outside of hair. Hair treatments provide moisture from the inside to the outside of hair to repair the hair. WA12423S 9

[0081]

[0025] The viscosity of the hair conditioner is, for example, 5, 000 to 150, 000 mPa-s, the viscosity of the hair conditioner and treatment is, for example, 20, 000 to 60, 000 mPa-s, and the viscosity of the hair mask is, for example, 80, 000 to 150, 000 mPa-s.

[0082]

[0026] The viscosity of the high-viscosity hair conditioner into which the emulsion composition is mixed may be, for example, 0.75 times, 0.8 times, 1.0 time, 1.5 times, 1.8 times, 2 times, or 2.5 times or less the viscosity ( 1 time) of the emulsion composition-free hair conditioner.

[0083]

[0027] The emulsion composition is added in, for example, a hair conditioner so that the silicone content becomes 10% to 20%, preferably 11% to 19%, more preferably 12% to 18%, still more preferably 13% to 17%, and particularly preferably 14% to 16%.

[0084]

[0028] Effects:

[0085] ( 1 ) The emulsion composition according to the present invention has a low viscosity and is easy to handle even with a high-viscosity polyorganosiloxane contained in a higher amount.

[0086] (2 ) When the emulsion composition according to the present invention is added to a base material for hair conditioners and the like, the viscosity of the base material is less likely to decrease. Furthermore, the decrease in viscosity can be suppressed to the same level as that when WA12423S 10

[0087] oils are directly added even though the emulsion composition is added. Therefore, it is useful, for example, as an emulsion composition for hair cosmetic.

[0088] (3) Since the composition is an emulsion composition, it is easy to stir and handle even when a high-viscosity silicone is added.

[0089] Brief Description of Drawings

[0090]

[0029] FIG. 1 is a diagram illustrating an example of the viscosities of conditioners.

[0091] Description of Embodiments

[0092]

[0030] Hereinafter, the emulsion composition according to the present invention will be described in detail.

[0093]

[0031] Emulsion Composition:

[0094] The emulsion composition is an emulsion composition that includes a high-viscosity polyorganosiloxane in a large amount. This emulsion composition can be easily incorporated into cosmetic products, and so desired high-viscosity cosmetic products can be obtained. Components of the emulsion composition will be described in detail below.

[0095]

[0032] Component (A): polyorganosiloxane mixture

[0096] The component (A) is a polyorganosiloxane mixture. The polyorganosiloxane mixture is contained in an amount of 65 to 90% by mass, preferably 66 to 85% by mass, and more preferably 68 to 80% by mass relative to 100% by mass of the emulsion composition. The viscosity thereof is 100 Pa-s or more. The WA12423S 11

[0097] polyorganosiloxane mixture is a mixture of a high-viscosity component and a low-viscosity component.

[0098]

[0033] The polyorganosiloxane as the component (A-l ) is one or more polyorganosiloxanes contained in an amount of 95 to 5 parts by mass relative to 100 parts by mass of the polyorganosiloxane mixture.

[0099] One or more polyorganosiloxanes as the component (A-l ) have a viscosity, at 25°C, of 2 to 100 mPa-s, preferably 5 to 50 mPa-s, and more preferably 5 to 20 mPa-s.

[0100]

[0034] The polyorganosiloxane as the component (A-2 ) is a polyorganosiloxane contained in an amount of 5 to 95 parts by mass relative to 100 parts by mass of the polyorganosiloxane mixture.

[0101] The polyorganosiloxane as the component (A-2 ) has a viscosity, at 25°C, of 1 x 104to 1 x 108mPa-s, preferably 1 x 105to 1 x 108mPa-s, more preferably 1 x 106to 1 x 108mPa-s, and even more preferably 5 x 106to 5 x 107mPa-s.

[0102]

[0035] The amount of the high-viscosity polyorganosiloxane as the component (A-2) may be 40 to 70 parts by mass, preferably 45 to 65 parts by mass, and more preferably 50 to 60 parts by mass, relative to 100 parts by mass of the low-viscosity polyorganosiloxane as the component (A-l).

[0103]

[0036] The polyorganosiloxanes as the component (A-l ) and the component (A-2) may be used singly or in an appropriate combination of two or more types thereof. WA12423S 12

[0104]

[0037] The molecular structures of the component (A-l ) and the component (A-2) are not particularly limited, and may be, for example, a linear structure, a partially branched linear structure, a branched structure, a cyclic structure, or a branched cyclic structure. Among these, the component (A-l) and the component (A-2) are preferably substantially linear polyorganosiloxanes. Specifically, the component (A-l) and the component (A-2) may be linear diorganosiloxanes in which the molecular chain is mainly composed of diorganosiloxane repeating units and both terminals of the molecular chain are blocked with triorganosiloxy groups. Some or all of the molecular chain terminals or some of the side chains may be silanol groups.

[0105]

[0038] The component (A-l ) and the component (A-2 ) may be a polymer composed of a single siloxane unit or a copolymer composed of two or more siloxane units.

[0106]

[0039] Specifically, the average composition formula of the component (A-l) and the component (A-2) is represented by the following general formula ( 1 ):

[0107] R1aSiO( 4-a ) / 2… ( 1 )

[0108] (In the formula (1), R1s are the same as or different from each other and each are an unsubstituted or substituted monovalent hydrocarbon group having 1 to 20 carbon atoms, or a hydroxyl group, and a is preferably 1.7 to 2.3, more preferably 1.8 to 2.2, and still more preferably 1.95 to 2.15.). WA12423S 13

[0109]

[0040] In one embodiment, the monovalent hydrocarbon group represented by R1may essentially be a methyl group. In addition, it is preferable that 70 mol% or more of R1s be methyl groups, in consideration of physical properties and economic efficiency of the emulsion composition, and normally, it is preferable that 90 mol% or more of R1s be methyl groups.

[0110] In the above-mentioned formula, R1s are the same as or different from each other and each are a monovalent hydrocarbon group having 1 to 20 carbon atoms, and examples thereof include an alkyl group such as a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, a dodecyl group, a tetradecyl group, a hexadecyl group, an octadecyl group, a cyclopentyl group, and a cyclohexyl group; an aryl group such as a phenyl group, a tolyl group, and a naphthyl group; an alkenyl group such as a vinyl group and an allyl group; and groups obtained by substituting a part of hydrogen atoms in these monovalent hydrocarbon group structures with a halogen atom or an organic group containing a polar group such as an amino group, an acryloxy group, a methacryloxy group, an epoxy group, a mercapto group, and a carboxyl group. Among these, it is preferable that 90 mol% or more of R1s be methyl groups.

[0111]

[0041] These polyorganosiloxanes may be commercially available ones or ones produced by methods known to those WA12423S 14

[0112] skilled in the art.

[0113]

[0042] Component B: Surfactant

[0114] One of the surfactants as the component (B) may be the component (B-l), which includes one or more nonionic surfactants. The one or more nonionic surfactants as the component (B-l) are contained in an amount of 2% by mass to 6% by mass, more preferably 3% by mass to 6% by mass, relative to 100% by mass of the emulsion composition.

[0115]

[0043] Such a nonionic surfactant is represented by the following formula (2 ):

[0116] Z\ / OH

[0117]

[0118] < ox> b

[0119] R2(OC2H4)bOH … (2)

[0120] (in the formula, R2is an alkyl group having 15 or more carbon atoms, and b is 17 or less).

[0121]

[0044] The nonionic surfactant has a linear structure with the main chain having 15 or more carbon atoms. In addition, the nonionic surfactant has 13 or more and 17 or less units in the EO chain (polyoxyethylene chain), preferably 14 or more and 17 or less, more preferably 15 or more and 17 or less, and still more preferably 16 or more and 17 or less.

[0122]

[0045] Examples of the nonionic surfactant include a polyoxyethylene tridecyl ether, a polyoxyethylene cetyl ether, and a polyoxyethylene lauryl ether. A polyoxyethylene cetyl WA12423S 15

[0123] ether is preferable.

[0124]

[0046] One of the surfactants of the component (B ) may be the component (B-2 ), which is a polyoxyethylene hydrogenated castor oil ester or polyoxyethylene hydrogenated castor oil ether. The content of the polyoxyethylene hydrogenated castor oil ester or polyoxyethylene hydrogenated castor oil ether is preferably 2 % by mass to 6% by mass, and more preferably 3% by mass to 6% by mass, relative to 100% by mass of the emulsion composition.

[0125]

[0047] The polyoxyethylene hydrogenated castor oil ester or polyoxyethylene hydrogenated castor oil ether is represented by the following formula ( 3 ):

[0126] O O — (CH2CH2O)XH

[0127] CH2 — O - (CH2CH2O)! - C(CH2)1OCH(CH2)5CH3

[0128] O O — (CH2CH2O)yH

[0129] CH - O - (CH2CH2O)m - C(CH2)1OCH(CH2)5CH3

[0130] O O — (CH2CH2O)ZH

[0131]

[0132] CH2 — O - (CH2CH2O)n - C(CH2)1OCH(CH2)5CH3

[0133] ... ( 3 )

[0134] in the formula, x + y + z + l + m + n is 60 to 300, 1

[0135]

[0136] 0, m 0

[0137]

[0138] , and n 0.

[0139]

[0048] Component ( C ): water

[0140] Water as the component ( C ) is not particularly limited, and examples thereof include tap water, filtered water, puri fied water, pure water, and ion-exchanged water. Ion- WA12423S 16

[0141] exchanged water is preferably used.

[0142]

[0049] Component ( D): Emulsi fication aid

[0143] The emulsi fication aid is not an essential component, but may be added to stabili ze the emulsion. The emulsi fication aid is contained in an amount of 2 % by mass to 15% by mass, preferably 3% by mass to 12 % by mass, relative to 100% by mass of the emulsion composition.

[0144]

[0050] The emulsi fication aid may be composed of any one or more of the compounds represented by the formulas ( 4. 2 ) to ( 7. 2 ).

[0145] C3H8O3( 4. 1 )

[0146] Molecular weight: 92. 09

[0147]

[0148] OH OH OH

[0149] ( 4. 2 )

[0150]

[0051] 1, 3-butylene glycol

[0151] C 4 H10O2 ( 5. 1 )

[0152] Molecular weight: 90. 1

[0153]

[0154] ( 5. 2 )

[0155]

[0052] Diglycerin

[0156] C6H14O5 ( 6. 1 )

[0157] Molecular weight: 166. 17 WA12423S 17

[0158] OH

[0159]

[0160] OH

[0161] ( 6.2 )

[0162]

[0053] Propylene glycol

[0163] C3H8O2(7.1 )

[0164] Molecular weight: 76.09

[0165] OH

[0166] OH

[0167]

[0168] H3C '

[0169] (7.2 )

[0170]

[0054] Examples of the emulsification aid include glycerin, polyethylene glycol, diglycerin, butylene glycol, and propylene glycol. One type alone or two or more types of the emulsification aids may be contained.

[0171]

[0055] The emulsion composition of the present invention may further include conventionally known additives as optional components other than the components (A) to (D) as long as the obj ect of the present invention is not hindered. Examples of such additives include a pigment, a dye, an antistatic agent, a preservative, a stabilizer, a fungicide, a polymerization initiator, an antioxidant, and a pH adjuster. These additional optional components may be used alone or in combination of two or more.

[0172]

[0056] Method for producing emulsion composition: WA12423S 18

[0173] A method for producing the emulsion composition of the present invention includes:

[0174] a step (SI ) of mixing the low-viscosity polyorganosiloxane and the high-viscosity polyorganosiloxane to obtain a polyorganosiloxane mixture; and

[0175] a step (S2 ) of mixing at least the polyorganosiloxane mixture, a surfactant, and water to obtain the emulsion composition.

[0176] Mixing in the step (S2 ) may be performed while an emulsification aid, an additive (e. g., a preservative, a stabilizer, and the like), or a combination of both is further contained.

[0177] Mixing may be performed with, for example, a planetary mixer, a stirrer, or an emulsification stirrer.

[0178] At the time of mixing, stirring may be performed while heating.

[0179]

[0057] Method for adding the emulsion composition into cosmetic product:

[0180] The emulsion composition is mixed with a cosmetic product.

[0181] It is preferable to add and mix the emulsion composition into the cosmetic product so that the silicone content is 10% to 20%. Mixing may be performed with, for example, a planetary mixer, a stirrer, or an emulsification stirrer.

[0182]

[0058] EXAMPLES WA12423S 19

[0183] Table 1 shows the mixing ratios and measurement results of Examples 1 to 7 in which a nonionic surfactant having a linear structure was used as the surfactant. Table 2 shows the mixing ratios and measurement results of Comparative Examples 1 to 12.

[0184]

[0059] The emulsion composition was produced by the following procedure.

[0185] ( 1 ) A low-viscosity polyorganosiloxane (component (A-2 ) ) and a high-viscosity polyorganosiloxane (component (A-l) ) were stirred and mixed using HIVIS DISPER MIX 3D-2 manufactured by PRIMIX Corporation to obtain a polyorganosiloxane mixture (component (A) ).

[0186] (2 ) A surfactant corresponding to the component (B), a preservative corresponding to the component (E), and purified water (component (C) ) were added to 70% by mass of the polyorganosiloxane mixture as the component (A), and the mixture was stirred at 2, 500 rpm using ULTRATURRAX T50 basic shaft generator G45G manufactured by IKA to obtain a silicone emulsion.

[0187] (3) An emulsification aid corresponding to the component (D) was added, and the mixture was stirred again at 2, 500 rpm using ULTRATURRAX T50 basic shaft generator G45G to obtain the desired final emulsion composition.

[0188]

[0060] Emulsion particle size:

[0189] The particle size of the emulsion is an average particle WA12423S 20

[0190] diameter, and is D50, which is the 50% particle diameter in a volume-based cumulative particle size distribution measured by a laser diffraction particle size measuring device (Zetasizer Lab blue manufactured by Malvern Panalytical Ltd. ). The same measurement method is adopted unless otherwise specified.

[0191] Alternatively, a median diameter may be adopted.

[0192]

[0061] Viscosity measurement:

[0193] The viscosity of the emulsion composition or a conditioner at 25°C was measured in accordance with JIS K7117-2. The emulsion composition or the conditioner was placed between a fixed flat plate and a cone that had a diameter of 25 mm and that was rotated with a cone angle of 1° or 2°, and the viscosity was measured using a viscometer Physica MR301 (manufactured by Anton Paar GmbH) at shear rates of 4, 10, or 20 ( 1 / s) and with a gap of 0.106 mm.

[0194] The viscosity was measured 120 times at respective shear rates of 4 ( 1 / s), 10 ( 1 / s), and 20 ( 1 / s), and the average value was calculated from the measured viscosities. Note that the conditioner was measured only at a shear rate of 4 ( 1 / s).

[0195]

[0062] The viscosity of the mixture of the component (A-l ) and the component (A-2), the viscosity of the conditioner (original conditioner without emulsion composition), and the viscosity of the conditioner to which the emulsion composition had already been added were measured.

[0196] In preparation of the emulsion composition-containing WA12423S 21

[0197] conditioner, the emulsion composition was added so that the silicone content became 15%. Compared to the viscosity of the conditioner before addition of the emulsion composition, the relative viscosity change in the conditioner after addition of the emulsion composition was calculated by the following formula. An increase in viscosity was expressed as a positive value, and a decrease in viscosity was expressed as a negative value.

[0198] Relative viscosity change (%) = 100 × (viscosity of conditioner after addition of the emulsion composition / viscosity of conditioner before addition – 1) Example Components Characteristics of substance 1 2 3 4 5 6 7 A-1-1 Dimeth iconol Viscocity: 30,000,000 mPa-s 24.50 24.50 24.50 A-1-2 Dimeth iconol Viscocity: 10,000,000 mPa-s 24.50 24.50 24.50 24.50 A-2 Dimeth ic one Viscocity: 10 mPa’s 45.50 45.50 45.50 45.50 45.50 45.50 45.50

[0199] Linear structure with C16 main chain B-1-2 Polyoxyethylene cetyl ether 5.00 5.00 5.00 3.00 5.00 5.00 5.00 and EO chains of 13 C Water 14.00 24.00 19.00 21.00 14.00 24.00 19.00 D-1 Glycerin Emulsification aid 10.00 5.00 5.00 10.00 5.00 E Phenoxyethanol Preservative 1.00 1.00 1.00 1.00 1.00 1.00 1.00

[0200] Total 100.00 100.00 100.00 100.00 100.00 100.00 100.00

[0201] Evaluation criteria for good quality 1 2 3 4 5 6 7 Viscosity of mixture of component (A- 1 ) and component (A-2) 100Pa’s or more about 100 about 100 about 100 about 100 about 300 about 300 about 30

[0202] Particle size of emulsion [nm] 374.5 372.7

[0203] 25000 or less (shear rate: 4 / s) 23,614 16,669 21,928 9,128 22,721 18,356 21 233 Viscosity of emulsion [mPa-s] 5,000-15,000 (shear rate: 10 / s) 12,343 8,017 10,994 4,921 11,510 8,811 10319

[0204] 2,000-10,000 (shear rate: 20 / s) 7,620 4,921 6,687 3,155 7025 5,279 6,211 Viscosity of conditioner after addition [Pa’s] i^1 41 Pa-s or more %'2 55.32 51.61 41.07 Relative viscosity change of conditioner before and after -29.3% or more -4.63 -11.04 -29.20 addition [%] J5$1 Viscosity of conditioner before addition: 58.01 Pa*s Viscosity of conditioner when the same amount of water was added: -54.53%

[0205]

[0206] 5

[0207] X X

[0208] X. X X

[0209]

[0210] WA12423S 24

[0211]

[0065] The formulations of the conditioners used in Examples and Comparative Examples are shown in Table 3.

[0212]

[0066] [Table 3]

[0213] Conditioner (original)

[0214] Z-l Water 90.6

[0215] Z-2 Cetyl alcohol 4.00

[0216] Z-3 Stearyl alcohol 2.00

[0217] Z-4 Steartrimonium chloride 2.63

[0218] Z-5 Ethylhexylglycerin 0.80

[0219] Total 100.0

[0220]

[0221]

[0067] Other Test Examples:

[0222] In Examples 1 to 7, when the amount of the surfactant was changed to 1%, the emulsion composition was emulsified, but was not stable in the long term and was separated. When the amount of the surfactant was 0.5%, the composition could not be emulsified.

[0223]

[0068] Table 4 shows the mixing ratios and measurement results of Examples 8 to 11 and Comparative Examples 13 and 14 in which a polyoxyethylene hydrogenated castor oil ether was used as the surfactant. Example Comparative Example Component Characteristics of substance 8 9 10 11 13 14 A-1-1 Dimethiconol Viscocity: 30,000,000 mPa-s 24.50 24.50

[0224] A-1-2 Dimethiconol Viscocity: 10,000,000 mPa-s 24.50 24.50 24.50 24.50 A-2 Dimethicone Viscocity: 10 mPa’s 45.50 45.50 45.50 45.50 45.50 45.50

[0225] Bulky structure with saturated fatty

[0226] B— 2-1 Polyoxyethylene hydrogenated castor oil ether 5.00 5.00 5.00 5.00 7.00 5.00 acid

[0227] C Water 19.00 24.00 19.00 24.00 17.00 14.00 D-1 Glycerin Emulsification aid 5.00 5.00 5.00 10.00 E Phenoxyethanol Preservative 1.00 1.00 1.00 1.00 1.00 1.00

[0228] Total 100.00 100.00 100.00 100.00 100.00 100.00

[0229]

[0230] Evaluation criteria for good quality 3 4 5 6 13 14 Viscosity of mixture of component (A— 1 ) and component (A-2) 100Pa-s or more about 100 about 100 about 300 about 300 about 100 about 10

[0231] Particle size of emulsion [nm] 527.1 540.9 681.6 691.6 400.0 543.7

[0232] 25,000 or less (shear rate: 4 / s) 20,836 15,875 13,792 12,403 64,493 25,103 Viscosity of emulsion [mPa’s] 5,000-15,000 (shear rate: 10 / s) 14,407 10,914 10,319 9,247 Unmeasurable 16,748

[0233] 2,000-10,000 (shear rate: 20 / s) 10,914 8,493 8,533 7,660 Unmeasurable 12,601 Viscosity of conditioner after adddition [Pa-s] j££l 41 Pa-s or more ■%: 2 103.58 125.71 116.33 109.37 121.29 Relative viscosity change of conditioner before and after addition

[0234] - 29.3% or more 78.56 116.70 100.53 88.54 109.08

[0235] [%]^1

[0236]

[0237] Viscosity of conditioner before addition: 58.01 Pa*s

[0238] Viscosity of conditioner when the same amount of water was

[0239] added: -54.53% WA12423S 26

[0240]

[0070] Table 5 shows the mixing ratios of the conditioner and the emulsion composition, the solid content of the emulsion composition, the viscosity after addition, the relative viscosity change, and the determination results for GUM BLEND (reference) (using BELSIL GB2170 GUM BLEND manufactured by Wacker Asahikasei Silicone Co., Ltd. ) added. As to the viscosity evaluation, when the viscosity was equal to or higher than the acceptance criterion viscosity of 41.0 Pa-s (which is the conditioner viscosity when the GUM BLEND is added) and the relative viscosity change was "positive", the viscosity was evaluated as " A". When the viscosity was equal to or higher than the acceptance criterion viscosity and the relative viscosity change was "negative", the viscosity was evaluated as " B". These cases were considered as passing.

[0241] When the viscosity was less than the acceptance criterion viscosity of 41.0 Pa-s, the viscosity was evaluated as " C" and was rej ected.

[0242]

[0071] It is understood from the results in Table 5 that in Examples 1 to 3 and 8 to 11, although the mixing ratio of the emulsion solid content was smaller than that of GUM BLEND (reference), the conditioner viscosity after addition could be maintained high. FIG. 1 shows examples of conditioner viscosity. Details of Emulsion Formulation

[0243] Emulsifi Mixing Ratio Details of Conditioner Formulation Silicone Surfactant cation Aid Solid Relative

[0244] Evaluation Co nd it i

[0245] Content Viscosity Viscosity Additiv

[0246] of Additives oner Z-1 Z-2 Z-3 Z-4 Z-5 A-1-3 A-1-2 A-1-1 A-2 B-1-1 B-1-2 B-1-3 B-1-4 B-2-1 0-1 of [Pa's] Change esft]

[0247] Viscosity [%]

[0248] Emulsion K

[0249] - - Conditioner (original) 580 - c - Water 264 -54.5 785) 21.5: 71.10 3.14 1.57 2.06 0.63

[0250] c 70 Gomp Ex: 6 22.8 -60.6 78.5 21 5 7110 3 14 1 57 206 0.63 5.27 9:78 1:88

[0251] c 70 Comp. Ex. 7 23.8 -59.0 785 21,5 71 10 3.14 1.57 206 0.63 527 9.78 2.63 1.88 A 701 Comp Ex 13 121 3 109.1 78.5 21 5 71.10 314 1.57 206 0.63 5.27 9:78 263 1.88 A 70 Example 8 103.6 786 785 215 71.10 3.14 1.57 2)06 0.63 5.27 9.78 1.88 1.88 A 70 Example 9 1257 1167 785 21 5 71 10 3 14 1 57 2.06 0)63 527 9:78 1 )88 A 70 Example 10 116.3 100.5 78.5 21.5 71.10 3.14 1.57 2.06 063 5.27 9.78 1 88 1.88 A 70 Example 11 109.4 885 78.5 21.5 71.10 3 14 1.57 206 0.63 5.27 9.78 1.88 B 70 Example 1 55.3 -4.6 78.5 21.5 71.10 3.14 1 57 2.06 0.63 527 9.78 1,88 3:75 B 70 Example 2 51 6 -110 785 21 5 71.10 3.14 1.57 2:06 0,63 527 978 1.88

[0252] B 70 Example 3 41 1 -29.2 78.5 21.5 71.10 3.14 1.57 2.06 063 5.27 9.78 1.88 1 88 B 70 Comp. Ex, 2 55.1 -49 78.5 21 5 71 10 3.14 1.57 2:06 063 527 9)78 1.88 1.88 B 70 Comp. Ex. 3 49.4 -14.8 785 21.5 7110 3.14 1.57 2.06 0.63 5.27 9.78 1.88

[0253] C 70 Comp. Ex, 8 378 -34.8 78.5 21.51 71.10 3.14 1.57 206 0.63 5.27 978 1.88 1.88 C 70 CompEx 9 32.6 -43.9 78.5 21 5 7110 3 14 1.57 206 0.63 5.27 9:78 1.88

[0254] -

[0255]

[0256] 100 Gum Blend (reference) 41.0 -29.3 85.0 15.0 76.99 3.40 1.70 223 0.68 300 12.00

[0257] - Added so that the silicone content became 15% (water was added in the same amount as that of

[0258] CD emulsion having 70% silicone content).

[0259] - Acceptance standard viscosity: 41.0Pa*s (= conditioner viscosity with gum blend added) or

[0260] higher

[0261]

[0262] WA12423S 28

[0263]

[0073] Evaluation of Examples:

[0264] In Examples 1 to 7 and 8 to 11, the viscosity of the mixture of the component (A-l) and the component (A-2) was 100 Pa-s or more. The viscosity of the emulsion composition was higher or equal to the acceptance criterion viscosity at any of shear rates of 4 ( 1 / s), 10 ( 1 / s), and 20 ( 1 / s) because the structure and the addition amount of the surfactants were suitable.

[0265]

[0074] When the viscosities of the emulsion compositions of the four formulations (Example 3 and Comparative Examples 2, 8, and 12 ) using a surfactant having a linear structure are compared, the viscosities are found to increase in the order of Comparative Example 12, Example 3, Comparative Example 2, and Comparative Example 8. Similarly, with regard to the length of the EO chain of the surfactant used in the above-mentioned four formulations, the chain length increases in the same order, i. e., Comparative Example 12, Example 3, Comparative Example 2, and Comparative Example 8. From the above facts, it was evident that there is a tendency that the shorter the EO chain is, the lower the viscosity of the emulsion composition becomes.

[0266]

[0075] In Examples 8 to 11, the viscosities of the polyorganosiloxane corresponding to the component (A-l) differ. When comparing the viscosities of the component (A), those in Examples 8 and 9 are about 100 Pa-s whereas those in WA12423S 29

[0267] Examples 10 and 11 are about 300 Pa-s. When the viscosities of the emulsion compositions are compared, the viscosities in Examples 10 and 11 were lower than those in Examples 8 and 9. That is, there is a tendency that the higher the viscosity of the component (A) is, the lower the viscosity of the emulsion composition becomes. Since a bulky surfactant was used in Examples 8 to 11, the particle size increased and the viscosity of the emulsion composition decreased accordingly.

[0268]

[0076] The viscosity of the conditioner containing the emulsion composition (measured at a shear rate of 4 ( 1 / s) ) also met the acceptance criterion (41 Pa-s or more, the conditioner viscosity when the GUM BLEND is added).

[0269]

[0077] When the viscosities of the conditioners containing the emulsion compositions of the four formulations (Example 3 and Comparative Examples 2, 7, and 8 ) using a surfactant having a linear chain structure were compared, the viscosities of Example 3 and Comparative Example 2 met the acceptance criterion, whereas Comparative Examples 7 and 8 did not.

[0270] Regarding the structure of the surfactant used, those used in Example 3 and Comparative Example 2 had a carbon chain with a length of 16, while Comparative Examples 7 and 8 had carbon chains with lengths 13 and 12, respectively. That is, when a surfactant having a long carbon chain is used, the viscosity of the conditioner tends to be maintained.

[0271]

[0078] Evaluation of Comparative Examples: WA12423S 30

[0272] In Comparative Examples 1 to 3, the viscosity of the mixture of the component (A-l) and the component (A-2) was 100 Pa-s or more. However, the viscosity of the emulsion composition did not meet the acceptance criterion at either shear rate of 4 ( 1 / s) or 10 ( 1 / s). In Comparative Example 1, the type of surfactant used was the same as that in Example 1, but the addition amount was 7% by mass. As a result, an emulsion composition with smaller particles was obtained, and its viscosity was outside the acceptance criterion. In Comparative Examples 2 and 3, since the EO chain was longer than that of the surfactant used in Example 1, the viscosity failed to meet the acceptance criterion.

[0273]

[0079] In Comparative Example 4, since the viscosity of the mixture of the component (A-l) and the component (A-2) was not 100 Pa-s or more, the viscosity of the emulsion composition did not meet the acceptance criterion at a shear rate of 4 (1 / s).

[0274]

[0080] In Comparative Examples 5 to 7, since the carbon chain of the surfactant was short, the viscosity (measured at a shear rate of 4 ( 1 / s) ) of the conditioner containing the emulsion composition did not meet the acceptance criterion (41 Pa-s or higher).

[0275]

[0081] In Comparative Examples 8 and 9, since the EO chain of the surfactant was long as in Comparative Examples 2 and 3, the viscosity of the emulsion composition did not meet the WA12423S 31

[0276] acceptance criterion at both shear rates of 4 ( 1 / s) and 10 (1 / s). In addition, since the carbon chain of the surfactant was short, the viscosity (measured at a shear rate of 4 ( 1 / s) ) of the conditioner containing the emulsion composition did not meet the acceptance criterion (41 Pa-s or more).

[0277]

[0082] In Comparative Examples 10 to 12, since the carbon chain of the surfactant was short, the viscosity (measured at a shear rate of 4 ( 1 / s) ) of the conditioner containing the emulsion composition did not meet the acceptance criterion (41 Pa-s or more).

[0278]

[0083] In Comparative Example 13, the addition amount of the surfactant was 7% by mass, and an emulsion composition with smaller particles was obtained. Therefore, the viscosity of the emulsion composition did not meet the acceptance criterion at any of the shear rates of 4 ( 1 / s), 10 ( 1 / s), and 20 ( 1 / s).

[0279]

[0084] In Comparative Example 14, the amount of the emulsification aid added was 10%, and the viscosity of the emulsification aid had a large influence on the viscosity of the resulting emulsion composition. Therefore, the viscosity of the emulsion composition did not meet the acceptance criterion at any of the shear rates of 4 ( 1 / s), 10 ( 1 / s), and 20 ( 1 / s).

Claims

1. WA12423S 322.Claims3.

1. An emulsion composition comprising, relative to 100% by mass of the emulsion composition,4.a component (A) that is a polyorganosiloxane mixture contained in an amount of 65% by mass to 90% by mass, and that has a viscosity of 100 Pa·s or more;5.a component (B) that is a surfactant contained in an amount of 2% by mass to 6% by mass; and6.a component (C) that is water contained in an amount of 5% by mass to 34% by mass,7.wherein:8.the component (A) contains:9.a component (A-l ) that includes one or more polyorganosiloxanes, having a viscosity, at 25°C, of 2 to 100 mPa·s, contained in an amount of 95 to 5 parts by mass relative to 100 parts by mass of the polyorganosiloxane mixture, and a component (A-2 ) that is a polyorganosiloxane, having a viscosity, at 25°C, of 1 x 104to 1 x 108mPa·s, contained in an amount of 5 to 95 parts by mass relative to 100 parts by mass of the polyorganosiloxane mixture.10.

2. The emulsion composition according to claim 1, wherein the polyorganosiloxane of the component (A) is represented by the following formula ( 1 ):11.R1aSiO(4-a) / 2... ( 1 )12.(In the formula ( 1 ), R1s each are an unsubstituted or WA12423S 3313.substituted monovalent hydrocarbon group having 1 to 20 carbon atoms, or a hydroxyl group, and a is 1.7 to 2.

3. ).14.

3. The emulsion composition according to claim 1, wherein the surfactant of the component (B) includes, relative to 100% by mass of the emulsion composition:15.a component (B-l ) that includes one or more nonionic surfactants contained in an amount of 2% by mass to 6% by mass, or16.a component (B-2 ) that is a polyoxyethylene hydrogenated castor oil ester or polyoxyethylene hydrogenated castor oil ether contained in an amount of 2% by mass to 6% by mass.17.

4. The emulsion composition according to claim 1, wherein the nonionic surfactant of the component (B-l) is represented by the following formula (2 ):

19. 21.R2(OC2H4)bOH … (2)22.(in the formula, R2is an alkyl group having 15 or more carbon atoms, and b is 17 or less).23.

5. The emulsion composition according to claim 1, wherein the polyoxyethylene hydrogenated castor oil ester or polyoxyethylene hydrogenated castor oil ether as the component (B-2) is represented by the following formula (3): WA12423S 3424.O O — (CH2CH2O)XH25.CH2 — O - (CH2CH2O)! - C II(CH2)1OC IH(CH2)5CH326.O O — (CH2CH2O)yH27.CH — O - (CH2CH2O)m - C II(CH2)1OC IH(CH2)5CH328.O O — (CH2CH2O)ZH29.CH2 — O - (CH2CH2O)n - C II30.

31. (CH2)1OC IH(CH2)5CH332.( 3 )33.in the formula x + y + z + l + m + n is 60 to 300, 134.

35. 0, m 036.

37. , and n 0.38.

6. The emulsion composition according to claim 1, comprising a component ( D) that is an emulsi fication aid contained in an amount of 2 % by mass to 15% by mass relative to 100% by mass of the emulsion composition.39.

7. The emulsion composition according to claim 1, having a viscosity that meets any of the following conditions:40.25, 000 mPa·s or less at 25°C and a shear rate of 4 ( 1 / s ); 5, 000 to 15, 000 mPa·s at 25°C and a shear rate of 10 ( 1 / s ); and41.2, 000 to 10, 000 mPa·s at 25°C and a shear rate of 20 ( 1 / s ).42.

8. The emulsion composition according to claim 1, for use in a cosmetic product.

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