Use of silicone polyethers with arylalkyl groups in personal care products

Abstract: A composition which is a silicone polyether containing arylalkyl groups, most preferably an arylalkyl group such as the 2-phenylpropyl group, i.e., -CH 2 CH(C 6 H 5 )CH 3 . The compositions demonstrate improvements in emulsification over silicone polyethers without such arylalkyl groups. The compositions have a formula generally corresponding to R 3 SiO(R 2 SiO) x (RQSiO) y (RQ'SiO) z SiR 3 in which R is an alkyl group, Q is a polyoxyalkylene block, Q' is an arylalkyl radical, x is 0-500, y is 1-50 and z is 1-50. The compositions and emulsions containing the compositions have general utility, but are especially useful in the personal care arena.

Description: This invention is directed to use of silicone polyethers with arylalkyl groups preferably 2-phenylpropyl arylalkyl groups, i.e., -CH 2 CH(C 6 H 5 )CH 3 in personal care products. These silicone polyethers show improved emulsification over silicone polyethers without arylalkyl groups such as 2-phenylpropyl groups. Thus, (i) they are capable of forming water-in-organic oil or water-in-silicone oil emulsions at lower use levels; (ii) they exhibit higher emulsion stability in silicone and ester blended oil phases; and (iii) they produce stable emulsions in low viscosity, low internal phase formulations. While US Patents 5,227,200 and 5,384,383, both of which are assigned to the same assignee as the present invention, describe silicone polymers containing 2-phenylpropyl groups, none of the silicone polymers in the '200 patent or the '383 patent are silicone polyethers, nor are they terpolymeric types of silicone polyethers. A third US Patent 5,389,365 also assigned to the same assignee as the present invention, describes silicone terpolymers containing polyether substitution, but the '365 patent does not include silicone terpolymers containing arylalkyl groups such as 2-phenylpropyl groups. EP-A-0779319 describes organopolysiloxane copolymers having phenylalkyl and polyether substituents. These copolymers can be used, for example in the form of a solution or dispersion as foam-controlling agents in hydrocarbon fuels such as diesel fuels. In contrast, the present invention relates to use in personal care products of arylalkyl functional silicone polyethers, and to personal care products comprising stable water-in-silicone oil emulsions prepared with said arylalkyl functional silicone polyethers. Such compositions were found to exhibit improved performance over standard commercially available silicone polyethers which did not contain arylalkyl groups such as 2-phenylpropyl groups. In addition, they exhibit better performance in low internal phase emulsions, better tolerance to certain esters and are effective at lower active levels. This invention is directed to use of silicone polyethers generally corresponding to the formula (I): R 3 SiO(R 2 SiO) x (RQSiO) y (RQ'SiO) z SiR 3 in which R is an alkyl group, Q is a polyoxyalkylene block containing a linking group and a terminating group, Q' represents an arylalkyl radical, x is 0-500 y is 1-50 and z is 1-50 in personal care products for hair, skin or underarm. The invention is also directed to personal care products comprising emulsions containing these types of silicone polyethers. Silicone polyethers used according to the present invention are described by the formula (I): R 3 SiO(R 2 SiO) x (RQSiO) y (RQ'SiO) z SiR 3 In the formula, R represents an alkyl group containing 1-6 carbon atoms such as methyl, ethyl, propyl and butyl. R is most preferably methyl. Q represents a polyoxyalkylene block containing a linking group and a terminating group. The polyoxyalkylene block is represented by the formula - R b -O-(C 2 H 4 O) p -(C 3 H 6 O) s -R c . The linking group R b is -C m H 2m -. The terminating group R c is hydrogen or an alkyl group of one to six carbon atoms. m in the linking group has a value of two to eight. p and s in the oxyalkylene segment of the block each have a value such that the oxyalkylene segment -(C 2 H 4 O) p -(C 3 H 6 O) s - of the polyoxyalkylene block has a weight average molecular weight in the range of 300 to 5,000. The oxyalkylene segment preferably has 50-99 mole percent of oxyethylene units -(C 2 H 4 O) p - and 1-50 mole percent of oxypropylene units -(C 3 H 6 O) s -. The terminating group R c is preferably a methyl group. m is preferably three or four. p and s preferably each have a value to provide a molecular weight for oxyalkylene segment -(C 2 H 4 O) p -(C 3 H 6 O) s - of between 400 to 3,000. Most preferably, p and s each have values of 1 to 28. If desired, however, s can also be equal to zero. Q' represents an arylalkyl radical selected from the group consisting of phenylmethyl (benzyl), 1-phenylethyl, 2-phenylethyl, 2-phenylpropyl, 1-phenylbutyl, 4-phenylbutyl and 2-phenylheptyl. Preferably, Q' is 2-phenylpropyl. x has a value of 0-500, preferably 1-400, and most preferably 50-200. y has a value of 1-50, preferably 1-25, and most preferably 1-10. z has a value of 1-50, preferably 1-25, and most preferably 1-10. The structure of these silicone polyethers can be varied and modified, such as to provide silicone polyether polymers, copolymers and terpolymers containing: 1. A weight percent of ethylene oxide in the polymer ranging from 5 to 20 percent; 2. A weight percent of arylalkyl, e.g., 2-phenylpropyl, in the polymer ranging from 1 to 15 percent; and 3. A degree of polymerization DP, i.e., x + y + z, of 70 to 500, preferably 100 to 400. The methods used to prepare these silicone polyethers are generally known in the art. Thus, one of the methods involves the hydrosilylation of an ≡SiH containing siloxane with an alkenylbenzene, in the presence of a platinum catalyst such as chloroplatinic acid, as described.in the '200 patent. Another method is described in the '365 patent and involves combining stoichiometric amounts of an ≡SiH containing siloxane with an alkenyl ether terminated organic oxyalkylene compound in the presence of a platinum catalyst such as chloroplatinic acid. In methods according to the present invention, it is preferred to employ an alkenyl ether terminated organic oxyalkylene compounds which contains at least three to ten carbon atoms in the alkenyl group, examples of which are allyl, isopropenyl, 2-butenyl, 3-butenyl or hexenyl. Allyl is the most preferred alkenyl group. Some representative allyl ether terminated organic oxyalkylene compounds include H 2 C=CH-CH 2 -O-(CH 2 -CH 2 O) a -R'; H 2 C=CH-CH 2 -O-[CH 2 -CH(CH 3 )O] b -R'; and H 2 C=CH-CH 2 -O-(CH 2 -CH 2 O) a -[CH 2 -CH(CH 3 )O] b -R'; in which a is 1-120; b is 1-50; and R' is hydrogen or an alkyl radical containing 1-6 carbon atoms, such as methyl, ethyl, propyl or butyl. In the examples set forth below, the allyl ether terminated organic oxyalkylene compound used was a polyethylene oxide monoallylether containing 7 moles of ethylene oxide. A third method involves the preparation of a trimethylsiloxy-endcapped methylhydrogen siloxane via an anhydrous triflic acid, i.e., trifluoromethane sulfonic acid, catalyzed polymerization of hexamethyldisiloxane, tetramethylcyclotetrasiloxane and pentamethylcyclopentasiloxane. Such a method is described in detail in US Patent 5,578,692, which is another patent assigned to the same assignee as the present invention. These and other similar methods for preparing silicone polyethers are also described in detail in the standard text on silicone chemistry, entitled Chemistry and Technology of Silicones, by Walter Noll, Academic Press, Inc., New York, New York, Pages 373-376, (1968). The general procedure for preparing emulsions according to the present invention is described in detail in Example 4. The following examples illustrate this invention in more detail. Example 1 Step 1 - Preparation of Me 3 SiO-(Me 2 SiO) x -(MeHSiO) y -(MeQ'SiO) z -SiMe 3 by acid equilibration where Q' is 2-phenylpropyl, x is 69, y is 1.6, z is 1.9 and Me is methyl. Ingredients Weight % Gram Hexamethyldisiloxane 2.80 7.1 Dimethylcyclosiloxane 88.41 223.9 Methylhydrogen cyclosiloxane 1.66 4.2 2-phenylpropylmethyl cyclosiloxane 7.01 17.75 Trifluoromethane sulfonic acid 0.12 0.3 In a three-necked round bottom flask equipped with stirrer, reflux condenser, thermometer and nitrogen blanket, all of the above ingredients were mixed and heated to 65°C. and held at 65-70°C. for 5 hours. Then, the mixture was cooled to 60°C., 3 g sodium bicarbonate and 3 g diatomaceous earth were added and stirring carried out for 16 hours to neutralize. The mixture was then filtered through a 0.45 µm membrane filter. Step 2 - Addition of polyether functionality. Ingredients Weight % Gram Polyethylene oxide monoallylether, 7 mole ethylene oxide 9.52 23.8 Siloxane prepared above 70.48 176.2 2-propanol 20 pph 50 Potassium acetate 250 ppm 0.05 Chloroplatinic acid 10 ppm Pt In a three-necked round bottom flask equipped with stirrer, reflux condenser, thermometer and nitrogen blanket, all of the above ingredients were mixed except chloroplatinic acid. The mixture was heated to 80°C. chloroplatinic acid added and heating continued to reflux and hold until ≡SiH was consumed. 2-Propanol was removed by vacuum distillation. Example 2 - Direct hydrosilylation followed by acid equilibration and addition of polyether functionality. Step 1 Ingredients Weight % Gram Me 3 SiO-(Me 2 SiO) 8.7 -(MeHSiO) 3.7 -SiMe 3 51.6 107 α-methylstyrene, C 6 H 5 C(CH 3 )=CH 2 12.08 25 Chloroplatinic acid 10 ppm Pt In a three-necked round bottom flask equipped with stirrer, reflux condenser, thermometer and nitrogen blanket, the siloxane component was added and heated to 50°C. and chloroplatinic acid added. Heating was continued to 70°C. and α-methylstyrene added drop-wise over a 45 min period. Then heating was continued to 120°C. and held until alpha-methylstyrene was consumed. Cool to room temperature. Step 2 - Dimethyl "D" unit (CH 3 ) 2 SiO= increase by acid equilitration. Ingredients Weight % Gram Hexamethyldisiloxane 79.3 198.3 Siloxane made in Step 1 20.7 51.75 Trifluoromethane sulfonic acid 0.09 0.3 In a three-necked round bottom flask equipped with stirrer, reflux condenser, thermometer and nitrogen blanket, all of the above ingredients were mixed, heated to 65°C. and held at 65-70°C. for 5 hours. After cooling to 60°C., 3 g sodium bicarbonate and 3 g diatomaceous earth were added and stirring effected for 16 hours to neutralize. The mixture was then filtered through a 0.45 µm membrane filter. Step 3 - Addition of polyether functionality. Ingredients Weight % Gram Polyethylene oxide monoallylether, 7 moles ethylene oxide 11.9 23.8 Siloxane prepared above 88.1 176.2 2-propanol 25 pph 50 Potassium acetate 250 ppm 0.05 Chloroplatinic acid 10 ppm Pt In a three-necked round bottom flask equipped with stirrer, reflux condenser, thermometer and nitrogen blanket, all of the above ingredients were mixed except chloroplatinic acid. The mixture was heated to 80°C. chloroplatinic acid added and heating continued to reflux and held until ≡SiH was consumed. 2-Propanol was removed by vacuum distillation. Example 3 Step 1 - Acid equilibration of an ethylmethyl/methyl 2-phenylpropyl/siloxane polymer. Ingredients A B C D E F Ethylmethyl/methyl 2-phenylpropyl siloxane polymer 132.14 132.33 171.18 93.43 44.48 93.43 Hexamethyldisiloxane 0.92 4.31 1.23 2.81 2.61 2.81 Dimethylcyclosiloxane 456.63 453.09 411.32 487.43 542.55 487.43 Methylhydrogen cyclosiloxane 10.31 10.27 16.27 16.33 10.36 16.33 Total - Gram 600.0 600.0 600.0 600.0 600.0 600.0 In a three-necked round bottom flask equipped with stirrer, reflux condenser, thermometer and nitrogen blanket, all of the above ingredients were mixed and 0.6 ml trifluoromethane sulfonic acid added. The mixture was heated to 65°C. and held at 65-70°C. for 5 hours. After cooling to 60°C., 3 g sodium bicarbonate and 3 g diatomaceous earth were added and stirred for 16 hours to neutralize. The mixture was filtered through a 0.45 µm membrane filter. Step 2 - Addition of polyether functionality. Step 2 in Example 1, or Step 3 in Example 2 was repeated. The compatibility in a variety of formulating materials, of a siloxane prepared according to the procedure outlined in Example 1 Step 1 without polyether functionality, was compared to that of a polydimethylsiloxane (PDMS) having about an equivalent molecular weight. In at least two instances, an enhanced solubility was found at a 50/50 ratio, namely with an 8 centistoke (mm 2 /s) mineral oil and neopentyl glycol dicaprylate/dicaprate. This data is shown in Table 1. Oil Compatibility of 2-Phenylpropyl Siloxane Ratio = Weight of Silicone/Weight of Oil 90/10 ratio 50/50 ratio 10/90 ratio OILS Dimethyl Siloxane 2-Phenyl propyl Siloxane Dimethyl Siloxane 2-Phenyl propyl Siloxane Dimethyl Siloxane 2-Phenyl propyl Siloxane Finsolv TN C C IC IC IC IC Coconut Oil cloudy cloudy IC IC cloudy cloudy Corn Oil IC IC IC IC IC IC Ethanol IC IC IC IC IC IC Jojoba Oil IC IC IC IC IC IC Mineral Oil 8 mm 2 /s C C IC C IC IC Sunflower Oil IC IC IC IC IC IC Isopropyl palmitate C C C C C C Isopropyl myristate C C C C C C Tridecyl Neo pentanoate C C C C C C Neopentyl Glycol Dicaprylate Dicaprate C C IC C IC IC In Table 1, "C" indicates that the combination of ingredients is compatible and that the combination results in a clear mixture. "IC" indicates that the combination of ingredients is incompatible, and that the combination forms two phases. "Cloudy" means that the combination of ingredients is stable, but that the mixture is cloudy. The oil identified as FINSOLV TN in Table 1 is a tradename of Finetex Incorporated, Elmwood Park, New Jersey, for a liquid C 12 to C 15 alkyl benzoate. The oil tridecyl neopentanoate is the ester of tridecyl alcohol and neopentanoic acid. The oil neopentyl glycol dicaprylate/dicaprate is the diester of neopentyl glycol and a blend of caprylic acid and capric acid. Example 4 - Performance in Emulsion Formulations 1 & 2 In order to further demonstrate the benefits of the silicone polyether emulsifiers used in the present invention, representative emulsifiers were dispersed in a cyclic dimethylsiloxane at variable concentrations to facilitate their handling. The emulsion formulations were prepared based upon the amount of active emulsifier, i.e., the weight percent of the emulsifier in the dispersion. Thus, the "active emulsifier" shown in Table 2 as the amount of the dispersion x is the percent of its non-volatile content (NVC). The balance of the oil phase in the emulsions was comprised of the cyclic dimethylsiloxane ingredient, which in this case, was decamethylcyclopentasiloxane, shown in Table 2 as D 5 . The "Silicone Blend" used in Table 2 was an ultra-high viscosity linear polydimethylsiloxane gum dispersed in the volatile cyclomethicone D 5 fluid. Emulsion Formulation 1 Emulsion Formulation 2 Oil phase Weight % Gram Weight % Gram D 5 balance balance balance balance Silicone Blend 10.0 24.0 0 0 Active 1.05 2.52 1.05 2.52 Emulsifier Total 25.0 60.0 30.0 72.0 Water Phase Weight % Gram Weight % Gram Water 73.5 176.4 68.5 164.4 Tween 20 0.5 1.2 0.5 1.2 NaCl 1.0 2.4 1.0 2.4 Total 75.0 180.0 70.0 168.0 It should be noted that the Emulsion Formulation 1 shown in Table 2 is a high-viscosity or "cream-type", high internal phase emulsion; whereas the Emulsion Formulation 2 is a low-viscosity or "lotion-type" emulsion. These emulsions were prepared in 400 and 600 ml beakers using a high speed rotary mixer having a single shaft with double blades set 2.54 cm [one inch] apart, a lower blade that was 5.08 cm [two inches] in diameter, and a top blade that was 6.35 cm [2 1/2 inches] in diameter. The procedure involved weighing components of the water phase in a 400 ml beaker and mixing them until it was homogenous and smooth, avoiding air entrapment. The next step was to weigh the components of the oil phase in a 600 ml beaker and mixing until homogenous and smooth, again avoiding air entrapment. With the mixer in the 600 ml beaker containing the oil phase, it was set so that the bottom of blade was just clear of the bottom of the beaker. The speed of the mixer was gradually increased to 1376 RPM. The final step was to add the water phase over a 15-20 minute period, and continue mixing the emulsion for an additional period of 15 minutes. The viscosity was measured with a Brookfield rotational viscometer with a heliopath stand, and is indicative of the emulsion particle size. Thus, within a given Emulsion Formulation, the higher the viscosity, the lower is the particle size, and the more narrow is the particle size distribution. In general, a high comparative viscosity indicates stability. Oven stability was determined and represents accelerated aging and storage of Emulsion Formulations in hot climates. Freeze/thaw cycles were also measured, and the cycles were conducted at temperatures of -20°C. to +22°C. These cycles represent the shipping and storage characteristics of Emulsion Formulations in cold climates. The results can be expressed as the number of cycles before the Emulsion Formulation shows signs of separation. The maximum number of cycles is generally considered to be 5 cycles. The results of these evaluations are shown in Table 3. For purposes of comparison, a standard commercial grade silicone polyether was employed. It is referred to hereinafter as well as in the accompanying Tables as Comparative SPE. Such commercial grade silicone polyethers are available from the Dow Corning Corporation, Midland, Michigan USA. The Comparative SPE was a species of a genus of siloxane polyethers of approximate structure: where R a is an alkyl group of one to six carbon atoms; R b is - C m H 2m -; R c is hydrogen, an alkyl group of one to six carbon atoms; m has a value of two to eight; p and s have values such that oxyalkylene segment -(C 2 H 4 O) p -(C 3 H 6 O) s - has a weight average molecular weight in the range of 300 to 5,000; the segment preferably having 50-99 mole percent oxyethylene units -(C 2 H 4 O) p - and 1-50 mole percent oxypropylene units -(C 3 H 6 O) s -; x has a value of 80-400; and y has a value of 2-10. In most commercial grade silicone polyethers, R a and R c are methyl groups; m is three or four; and the values of p and s are such as to provide a weight average molecular weight of the oxyalkylene segment -(C 2 H 4 O) p -(C 3 H 6 O) s - of between 400 to 3,000. Typically, p and s each have a value of 18 to 28. Silicone polyethers of this type are generally known in the art, and are described in numerous patents including US Patents 4,122,029, 4,268,499, 4,311,695, 4,268,499, 5,302,382 and 5,443,760, all of which are assigned to the same assignee as the present invention. Silicone polyethers of this type have done well in the market place, and perform particularly well in high viscosity, high internal phase emulsions such as clear gel antiperspirants. Such materials are versatile, yet possess shortcomings in specific areas. For example, in low viscosity formulations that are not thickened and have a low internal phase content, emulsions containing such materials tend to cream downward, forming a silicone layer at the top, i.e., a phenomenon know as syneresis. In addition, it is difficult to formulate a significant amount of ester-type ingredients into emulsions with such materials. Furthermore, in many instances, there is a need to formulate products using lower levels of the active emulsifier than is currently allowed with silicone polyethers of this type. The following results illustrate improvements in many of these areas which are obtained with silicone polyethers used according to this invention in contrast to the Comparative SPE materials. As is seen in Table 3, in Emulsion Formulation 1, all of the emulsifiers performed equivalently, and their performances could be evaluated on a scale as being about fair. In Emulsion Formulation 2, the Comparative SPE fell short of perfect stability, whereas some of the 2-phenylpropyl functional silicone polyether emulsifiers of the present invention performed somewhat better, most notably SPE F. Emulsion Formulation 1 Emulsion Formulation 2 SPE Initial viscosity mm 2 /s Oven stable 40 °C, months 3 max Oven stable 50 °C, one month cycle Freeze thaw cycle Initial visc, mm 2 /s Oven stable 40°C., months 3 max Oven stable 50°C, 1 month cycle Freeze thaw cycle (Me2)(2-phenylpropyl methyl)(polyether methyl) Terpolymer A 161,000 > 1 P 5 5,000 f f 5 B 137,000 > 1 P 5 6,000 top 5 C 108,000 > 1 P 5 2,100 f f 5 D 135,000 > 1 P 5 2,900 top 5 E 142,000 > 1 P 5 5,000 f f 5 F 270,000 > 1 P 5 3,100 P 5 Comparative SPE 125,000 3 P 5 3,600 top top 4 In Table 3, P means that the emulsion formulation passed without separation of any type. f means that it failed and indicates the formation of a water layer which is indicative of coalescence of the internal phase. top means that an oil layer was formed indicative of flocculation of the emulsion particles but without coalescence of the internal phase. Example 5 The amount of active emulsifier in the emulsion formulation 1 of Table 2 was varied, and the balance of the emulsion formulation was adjusted using volatile cyclomethicone fluid D 5 in order to maintain a constant phase ratio. Otherwise, the procedure carried out in Example 4 was repeated and the results are shown in Table 4. As can be seen in Table 4, of the three emulsifiers used in accordance with the present invention which were tested, two performed at least equal to or better than the Comparative SPE ("Compar. SPE"). It should be noted that emulsifier D performed perfectly. Emulsifiers at Lower Active Levels in Formulation 1 Composition A D E Compar.SPE 1.58 Percent Active Initial viscosity, mm 2 /s 102,000 124,000 119,000 202,000 Oven stability, 40 °C months (3 max) > 1 > 1 > 1 > 1 Oven stability, 50 °C 1 month, P/F P P P P Freeze/thaw cycle 5 5 5 5 1.05 Percent Active Initial viscosity, mm 2 /s 161,000 135,000 142,000 138,000 Oven stability, 40 °C months (3 max) > 1 > 1 > 1 3 Oven stability, 50 °C 1 month, P/F P P P P Freeze/thaw 5 5 5 5 0.8 Percent Active Initial viscosity, mm 2 /s 71,000 122,000 113,000 127,000 Oven stability, 40 °C months (3 max) > 1 > 1 > 1 > 1 Oven stability, 50 °C 1 month, P/F P P P P Freeze/thaw cycle 4 5 5 5 0.55 Percent Active Initial viscosity, mm 2 /s 56,000 116,000 90,000 90,000 Oven stability, 40 °C months (3 max) > 1 > 1 > 1 > 1 Oven stability, 50 °C 1 month, P/F P P P P Freeze/thaw cycle 2 5 5 2 0.3 Percent Active Initial viscosity, mm 2 /s fail 75,000 58,000 74,000 Oven stability, 40 °C months (3 max) --- > 1 > 1 > 1 Oven stability, 50 °C 1 month, P/F --- P P P Freeze/thaw cycle --- 5 3 2 In Table 4, P means that the Emulsion Formulation passed without separation of any type. fail means that it failed and indicates the formation of a water layer which is indicative of coalescence of the internal phase. Example 6 It is well known that emulsification becomes difficult when an oil phase of the emulsion contains a blend of a silicone oil and another organic oily material. One particularly difficult organic oil to emulsify in combination with a silicone oil is the FINSOLV TN ester noted above in Table 1. The purpose of this example is to highlight more benefits of the silicone polyethers of the present invention. Several emulsions were prepared containing a blend of the volatile cyclomethicone D 5 fluid and the FINSOLV TN C 12 to C 15 alkyl benzoate. The emulsion formulations are shown in Table 5 and represent blends of the FINSOLV TN ester and D 5 fluid at ratios of 42:50 and 50:50 FINSOLV TN:D 5 fluid, respectively. The phase ratio and the emulsifier level were maintained constant, and the procedure for preparing these emulsion formulations was the same as the procedure used in Example 4. Formulations Containing FINSOLV TN:D 5 Blends Emulsion 3 Emulsion 4 Oil phase Weight % Gram Weight % Gram D 5 13.2 40.02 11.4 34.50 FINSOLV TN 9.6 28.98 11.4 34.50 Active Emulsifier 1.0 3.00 1.0 3.00 Total 23.8 72.00 23.8 72.00 Water Phase Weight % Gram Weight % Gram Water 74.2 225.00 74.2 225.00 Tween 20 1.0 3.00 1.0 3.00 NaCl 1.0 3.00 1.0 3.00 Total 76.2 231.00 76.2 231.00 As can be seen in Table 6, the Comparative SPE performed well when FINSOLV TN content of the oil phase was 42 percent or less. However, at 50 percent, the Comparative SPE did not form an emulsion. Thus, it follows that any emulsifier capable of emulsification at 50 percent would be considered better. Emulsion Formulation C according to the present invention performed perfectly at 50 percent and Emulsion Formulation A according to the present invention performed nearly perfectly, as shown in Table 6. 2-Phenylpropyl Emulsifiers in Finsolv TN:D5 Blend 42 Percent Finsoly TN:D5 Blend 50 Percent Finsoly TN:D5 Blend SPE Initial viscosity (mm 2 /s) Oven stable 40 °C, months (3 max) Oven stable 50 °C, 1 month (p/f) Freeze thaw cycle Initial visc, (mm 2 /s) Oven stable 40 °C, months (3 max) Oven 50 °C, 1 month (p/f) stable Freeze thaw cycle (Me2)(2-phenylpropyl methyl)(polyether methyl) Terpolymer A 24,000 >1 P 5 20,000 > 1 P 4 B 11,000 f f 2 5,800 f f 4 J f --- --- - ---- --- - - C 24,000 > 1 P 5 9,700 > 1 P 5 H 3.400 > 1 P 0 f --- - - K 18,000 > I P 4 f --- - - D 8,000 > 1 P 5 12,000 f f 5 E 10,000 > I P 0 f --- - - F 19,000 > 1 P 2 f --- - - Comparative SPE 54,000 > 1 P 5 f --- - - In Table 6, P means that the emulsion formulation passed without separation of any type. f means that it failed and indicates the formation of a water layer which is indicative of coalescence of the internal phase. The silicone polyethers used in accordance with this invention and the emulsions containing these silicone polyethers are useful in and for preparing numerous types of over-the-counter personal care products for hair, skin and the underarm. Thus, they are especially useful and can be used in hair conditioners, hair shampoos, skin care lotions, facial cosmetics, deodorants and antiperspirants. In addition, they are used in other types pf personal care products such as skin creams, moisturizers, acne removers, wrinkle removers, facial cleansers, bath oils, perfumes, colognes, sachets, sunscreens, pre-shave lotions, after-shave lotions, liquid soaps, shaving soaps, shaving lathers, hair sprays, mousses, permanents, depilatories, cuticle coats, make-ups, color cosmetics, foundations, blushes, lipsticks, lip balms, eyeliners, mascaras, oil removers, cosmetic removers, delivery systems for oil and water soluble substances, and pressed powders.

Claims: Use of a silicone polyether having the formula (I): R 3 SiO(R 2 SiO) x (RQSiO) y (RQ'SiO) z SiR 3 in which each R is independently an alkyl group containing 1 to 6 carbon atoms; Q represents a polyoxyalkylene block containing a linking group and a terminating group, the polyoxyalkylene block having the formula: -R b -O-(C 2 H 4 O) p -(C 3 H 6 O) s -R c , in which the linking group R b is -C m H 2m -, the terminating group R c is hydrogen or an alkyl group of one to six carbon atoms, m in the linking group has a value of two to eight, p and s in the oxyalkylene segment of the block each has a value such that the oxyalkylene segment -(C 2 H 4 O) p -(C 3 H 6 O) s - of the polyoxyalkylene block has a weight average molecular weight in the range of 300 to 5,000; Q' represents an arylalkyl radical selected from phenylmethyl, 1-phenylethyl, 2-phenylethyl, 2-phenylpropyl, 1-phenylbutyl, 4-phenylbutyl and 2-phenylheptyl; x has a value of 0-500; y has a value of 1-50; and z has a value of 1-50 in a personal care product for hair, skin are underarm. Use of a silicone polyether according to claim 1 in which Q' is 2-phenylpropyl. Use of a silicone polyether according to claim 1 or 2, wherein R represents a methyl group. Use of a silicone polyether according to any of claims 1 to 3, wherein the oxyalkylene segment has 50-99 mole percent of oxyethylene units -(C 2 H 4 O) p - and 1-50 mole percent of oxypropylene units -(C 3 H 6 O) s -. Use of a silicone polyether according to any of claims 1 to 4, wherein the molecular weight of the oxyalkylene segment is from 400 to 3,000. Use of a silicone polyether according to any of claims 1 to 5, wherein p and s each have values of 1 to 28. Use of a silicone polyether according to any of claims 1 to 6, wherein: x has a value of 1 to 400; y has a value of 1-25; and z has a value of 1-25. Use of a silicone polyether according to claim 7, wherein: x has a value of 50 to 200; y has a value of 1 to 10; and z has a value of 1 to 10. A personal care product for hair, skin or underarm comprising an emulsion containing a silicone polyether of formula (I) as defined in any of claims 1 to 8. A personal care product according to claim 9, further containing an ester as a component in which the ester component is a liquid C 12 to C 15 alkyl benzoate.

Inventors: GUTEK BETH IRENE, ZOMBECK ALAN, GUTEK, BETH IRENE, ZOMBECK, ALAN
Applicants: DOW CORNING, DOW CORNING CORPORATION
Application year: 2000
Main classification: C08G77
IPC codes: C08G77, C08L83, A61K8, A61Q19