JP5509958B2 - Solid soap composition - Google Patents

Description

  The present invention relates to a solid soap composition, and in particular, quickly foams, has a creamy and elastic foam quality, and the foam quality lasts, has an excellent feeling after washing, and does not melt. The present invention relates to a solid soap composition excellent in storage stability and productivity.

  Conventionally, soap, which is a fatty acid salt, is mainly used as a cleaning agent for skin such as the face and body. Soap not only has a unique refreshing feeling after washing, but also has good biodegradability and is an environmentally friendly base. Among them, solid soap is widely used as the most common skin cleanser. Fatty acids derived from beef tallow, palm oil, coconut oil and palm kernel oil are used as fatty acids constituting the solid soap, and these fatty acids contain about 30 to 40% by mass of unsaturated fatty acids. Unsaturated fatty acids are effective in maintaining the solubility and moldability of soap, but have a problem of poor storage stability and are liable to cause discoloration and odor degradation. Therefore, there are solid soaps using only saturated fatty acids. Although foaming property (quick foaming) and storage stability are thereby improved, some people with sensitive skin may feel a refreshing feeling unique to soap as a refreshing feeling.

  In order to solve such a feeling of being washed up, an oil such as fatty acid glycerin monoester or a fatty acid having 12 to 22 carbon atoms is added to give a moist feeling. In some cases, it cannot be obtained sufficiently, or there are problems such as melting and breaking of soap. As a technique for improving these problems, Patent Document 1 uses a fatty acid glycerin monoester and lauric acid (saturated fatty acid having 12 carbon atoms) in combination, and Patent Document 2 uses chlorella powder and an amphoteric surfactant in combination. Method, Patent Document 3 discloses a method of adding bentonite.

  However, although these techniques can improve the feeling after washing, the creaminess of the foam and the improvement of melting, the foam is not sufficient in terms of the elasticity of the foam, and the foam quality is creamy and rich in elasticity. I couldn't get anything that lasted. Furthermore, when manufacturing soap, cracks may occur or mold release may decrease, and productivity is not good.

JP-A-8-283794 JP 2003-238993 A JP 2005-82685 A

  The present invention has quick foaming, creamy and elastic foam quality, and the foam quality lasts, has a good feeling after washing, does not easily melt, and has excellent storage stability and productivity. An object of the present invention is to provide a solid soap composition.

  In order to solve the above-mentioned problems, the present inventor has intensively studied and achieved the above object by using a solid soap composition comprising two types of polyethylene glycols having different specific molecular weights and a saturated fatty acid salt having a specific number of carbon atoms. Based on this finding, the present invention has been completed.

That is, the solid soap composition of the present invention comprises (1) polyethylene glycol a 0.01 to 1% by mass with a number average molecular weight of 200,000 to 600,000, and polyethylene glycol b 0.005 to 0.005 with a number average molecular weight of 1 million to 5 million. 5 wt%, I bar soap composition der consisting saturated fatty acid salt 98.5 to 99.985 wt%, the saturated fatty acid salts from 5 to 50 wt% saturated fatty acids lauric acid constituting the, 40 myristate 80% by mass, 5 to 20% by mass of palmitic acid, and the total amount of lauric acid, myristic acid and palmitic acid is 100% by mass, and the saturated fatty acid salt comprises the saturated fatty acid and a base composed of sodium and potassium. Solid obtained by reacting and having a sodium / potassium mass ratio of 99/1 to 50/50 to react with the saturated fatty acid It is a soap composition.
Moreover, (2) The solid soap composition which contains 0.01-2 mass parts of aloe extract or a seaweed extract with respect to 100 mass parts of said solid soap compositions is suitable.

  The solid soap composition of the present invention quickly foams, has a creamy and elastic foam quality, and the foam quality lasts, a moist feeling is obtained after washing, hardly melts down, and is stable in storage. There is no problem with this, and it is excellent in productivity.

  Embodiments of the present invention will be described below. The solid soap composition of the present invention comprises polyethylene glycol a having a number average molecular weight of 200,000 to 600,000 0.01 to 1% by mass, polyethylene glycol b having a number average molecular weight of 1,000,000 to 5 million, 0.005 to 0.5% by mass, carbon It consists of 98.5-99.985 mass% of saturated fatty acid salt of several 12-18. In the solid soap composition of the present invention, the total amount of the polyethylene glycols a and b and the saturated fatty acid salt is 100% by mass.

[Polyethylene glycol a and b]
The polyethylene glycols a and b used in the present invention have a number average molecular weight (hereinafter referred to as Mn) of 200,000 to 600,000 (preferably 250,000 to 500,000) and 1,000,000 to 5,000,000 (preferably 200, respectively). 10,000 to 4,000,000). Mn in the present invention is a value determined in terms of polyethylene glycol by gel permeation chromatography (GPC) measurement using tetrahydrofuran as a developing solvent.

  The addition amounts of polyethylene glycol a and b are 0.01% by mass or more and 0.005% by mass or more, respectively, when Mn is large, and 1% by mass or less and 0.5% by mass or less, respectively, when Mn is small. is there. Preferably, the addition amount of polyethylene glycol a is 0.1 to 0.8% by mass, the addition amount of polyethylene glycol b is 0.01 to 0.4% by mass, and more preferably the addition amount of polyethylene glycol a is 0. 0.1 to 0.5 mass%, and the addition amount of polyethylene glycol b is 0.05 to 0.3 mass%.

  When the Mn of the polyethylene glycol b is small and the addition amount is small, it is used together with the polyethylene glycol a having a large Mn, or conversely, when the Mn of the polyethylene glycol b is large and the addition amount is large, the polyethylene It is preferable to use a glycol a having a small Mn, since the foam quality and moist feeling after washing can be obtained in a well-balanced manner, and the productivity of soap is good. When the Mn of polyethylene glycol a or b is below the lower limit of the range defined by the present invention and the amount added is less than the lower limit of the range defined by the present invention, the elasticity of the foam is insufficient. Or a good feeling of use may not be obtained after washing. On the other hand, if Mn exceeds the upper limit of the range specified in the present invention and the addition amount exceeds the upper limit of the range specified in the present invention, the feeling of use is impaired due to slime and stickiness, and the productivity of soap is reduced. There is a risk of lowering.

[Saturated fatty acid salt]
The saturated fatty acid salt used in the present invention is a saturated fatty acid salt having 12 to 18 carbon atoms obtained by reacting a saturated fatty acid with a base. The saturated fatty acid is a saturated fatty acid having 12 to 18 carbon atoms, and a linear saturated fatty acid having 12 to 16 carbon atoms is preferable. Further, from the viewpoint of foaming and foam quality of the solid soap composition, the saturated fatty acid used in the present invention is composed only of lauric acid, myristic acid and palmitic acid (that is, the total amount of lauric acid, myristic acid and palmitic acid is 100). More preferably, lauric acid is 5 to 50% by mass, myristic acid is 40 to 80% by mass, and palmitic acid is 5 to 20% by mass, more preferably lauric acid is 10 to 40% by mass. %, Myristic acid is 55 to 75% by mass, and palmitic acid is 5 to 15% by mass.

  On the other hand, examples of the base to be reacted with the saturated fatty acid include alkali metals, ammonium, and alkanolamines, and bases made of sodium and potassium alkali metals are preferable from the viewpoint of foaming and foam quality. The base composed of sodium and potassium is more preferably one having a sodium / potassium mass ratio of 99/1 to 50/50, more preferably 90/10 to 60/40.

  The solid soap composition of the present invention can be obtained by adding a predetermined amount of polyethylene glycol a and b within the scope of the present invention to a saturated fatty acid salt which is a soap base. Here, since polyethylene glycol a and b may be decomposed under the influence of alkali or heat during the production process, it is preferably added in a kneading process performed at room temperature to 50 ° C. Kneading is performed by adding soap base, polyethylene glycol a and b, and other additional components with a mixer, roughly mixing them, and then uniformly mixing them with a refiner and a roll mill. In order to sufficiently mix, it is more preferable to repeat the refiner and roll mill several times.

  The solid soap composition of the present invention can further enhance the moist feeling after washing by further containing an aloe extract or seaweed extract.

[Aloe extract]
The aloe extract used in the present invention is an extract from aloe (Aloe Ferox, Aloe africane, Aloe spicata, Aloe barbadensis or a hybrid thereof (Liliaceae)), mesophyll powder obtained from mesophyll, or dried product thereof. Can also be used. A sticky feel can be obtained by the natural polymer polysaccharide such as mucin contained in the aloe extract, and it can give a moist feeling after washing. When powdered aloe extract is immersed in water, its volume increases and softens, so the powdered aloe extract is swollen before being added to the solid soap composition, or the extract is dried and solid soap is dried. It can also be added to the composition.

  For example, as an extract, “Aloe extract vera”, “Aloe Crash 30B”, “Aloe Vera Liquid (BG)”, “Bellagel 200”, “Biocell Act Aloe Vera B”, “Biocell Act Aloe Vera” manufactured by Ichimaru Falcos Co., Ltd. E ”,“ Falcolex Aloe KB ”and the like, and examples of the mesophyll powder obtained from mesophyll include“ Aloe Crush ”manufactured by Ichimaru Falcos Co., Ltd. These can also be used as dried products by known drying methods. Aloe extract can further enhance the moist feeling after washing by adding 0.01 to 2 parts by mass (preferably 0.1 to 1 part by mass) with respect to 100 parts by mass of the solid soap composition. it can.

[Seaweed extract]
The seaweed extract used in the present invention may be an extract from seaweed or a seaweed obtained by drying and pulverizing seaweed, and can be used in liquid or powder form. As seaweeds, brown algae such as Coleoptera, Ovalidae, and Hondawala, red algae such as Sugiori, Proboscis, Euphorbiaceae, and seaweeds belonging to green algae such as Chlorella, Casano, Pleurotus, Aosa, etc. Can be used. It is considered that a sticky feel is obtained by natural polymer polysaccharides such as fucoidan contained in the seaweed extract, and moisturizing can be given to the skin after washing. Among these seaweeds, those of brown algae are preferable, and extracts obtained from chrome or wakame are particularly preferable.

  As these extracts, “Wakame Spore (mekabu powder)” manufactured by Victory Ocean, obtained by drying and crushing the mekabu portion of wakame, NOF Co., Ltd. obtained by drying and crushing all the algae of black seaweed “Electst BG”, which is produced by extracting all the algae of chrome with BG (butylene glycol) and water. The seaweed extract is added with 0.01 to 2 parts by mass (preferably 0.1 to 1 part by mass) with respect to 100 parts by mass of the above-mentioned solid soap composition, thereby further improving the moist feeling after washing. Can be increased. In addition, the solid soap composition of the present invention may contain both an aloe extract and a seaweed extract, and the total amount of the aloe extract and seaweed extract in that case is based on 100 parts by mass of the solid soap composition. 0.01 to 2 parts by mass (preferably 0.1 to 1 part by mass).

  In the solid soap composition of the present invention, various components usually used in solid soap can be added to such an extent that the effects of the present invention are not impaired. For example, chelating agents, thickeners, anti-inflammatory agents, moisturizers, bactericides, preservatives, fragrances, pigments and the like can be added.

  Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. Using the compositions and components shown in Table 1 and Table 2 below, solid soap compositions were prepared by the method shown in the following Production Examples.

<Production example>
The fatty acid was placed in a 5 L double-arm kneader (Irie Shokai Co., Ltd., PNV-5 type) and dissolved at about 80 ° C., and then neutralized with a 28% by weight alkaline aqueous solution. The neutralization point was confirmed to be slightly red using a phenolphthalein indicator solution. Next, concentrated glycerin (“RG-S” manufactured by NOF Corporation), citric acid and lauric acid were added, and the mixture was dried to about 10% by mass by heating and stirring to obtain a soap base. Tables 1 and 2 show the mass ratio of sodium / potassium (Na / K) and the moisture content of the soap base in the alkaline aqueous solution used in each example and each comparative example.

  All the other components such as polyethylene glycol a, polyethylene glycol b and glycerin were added to the soap base and mixed well, and a plodder (manufactured by Nippon Kayoki Co., Ltd., “Mini Soap Prop”) was attached to the base. ) ”And a roll mill (“ BR-150 type bench roll ”manufactured by AIMEX Co., Ltd.), and after repeating the kneading three times, the base of the pudder is replaced with a shape that the soap bar can extrude, and the soap bar is extruded. Obtained. Furthermore, the obtained soap bar was shape | molded with the stamping machine ("FP-171" by Nippon Chemical Industries Co., Ltd.), and the solid soap was obtained.

The following materials were used.
・ Lauric acid: "NAA-122" manufactured by NOF Corporation
・ Myristic acid: "NAA-142" manufactured by NOF Corporation
・ Palmitic acid: “NAA-160” manufactured by NOF Corporation
・ Stearic acid: “NAA-180” manufactured by NOF Corporation
・ Oleic acid: “NAA-34” manufactured by NOF Corporation
・ Citric acid: Reagent special grade ・ Mn 290,000 polyethylene glycol: “Polyox WSR N-750” manufactured by Union Carbide
-Polyethylene glycol with Mn 380,000-"Alcox E-30" manufactured by Meisei Chemical Industry Co., Ltd.
-Polyethylene glycol with Mn 1.9 million ... "Polyox WSR N-60K" manufactured by Union Carbide
-Polyethylene glycol with Mn 2.85 million-"Alcox E-100" manufactured by Meisei Chemical Industry Co., Ltd.
・ Mn 3.7 million polyethylene glycol “Polyox WSR301” manufactured by Union Carbide
・ Aloe extract: “Aloe Crush” by Ichimaru Falcos
・ Seaweed powder (Wakame Mechabu) ... (Yes) Victory Ocean "Wakame Spore (Mekabu Powder)"
・ Seaweed powder (Kurome) ... "Electst PW" manufactured by NOF Corporation

  Foaming when each solid soap in Examples and Comparative Examples is foamed, foam quality such as creaminess and elasticity, and persistence of those foams, feeling of washing, presence or absence of melting of solid soap, storage stability In addition, the productivity at the time of production was tested by an evaluation method described later. An evaluation result is combined with Table 1 and Table 2, and is shown.

(1) Foaming 10 women (10-30s) were panelists, and foaming when soap was taken up in the hand was evaluated based on the following criteria.
2 points.
1 point ... Slightly slow bubbling.
0 points ... Slow foaming.

Furthermore, it judged as follows from the total score of all the panelists.
○ ・ ・ The total is 14 to 20 points, and there is no person who gave 0 points.
Δ ·· The total is 7 to 13 points.
× ·· The total is 0 to 6 points.

(2) Foam quality (creaminess, elasticity)
Ten women (10-30s) were panelists, and the foam quality when the soap was bubbled up was evaluated based on the following criteria.
2 points ... The foam is creamy and rich in elasticity.
1 point ··· The creaminess and elasticity of the foam are slightly insufficient.
0 points-insufficient creaminess and elasticity.

Furthermore, it judged as follows from the total score of all the panelists.
○ ・ ・ The total is 14 to 20 points, and there is no person who gave 0 points.
Δ ·· The total is 7 to 13 points.
× ·· The total is 0 to 6 points.

(3) Sustainability of foam quality 20 mL of a 2.5% by mass aqueous solution of solid soap is put into a large cup of Mirther (“IFM-180G” manufactured by Iwatani Corporation) and foamed for 30 seconds. A 1-yen coin was placed on the foam and the time to reach the bottom of the cup was measured. This was repeated three times to obtain an average value and evaluated based on the following criteria.
○ ······························································································································

(4) Feeling of use after washing (moist feeling, feeling of tension)
Ten women (10-30s) were panelists, and the feel after towel drying using solid soap was evaluated based on the following criteria.
2 points ・ ・ Moist feeling is obtained, and there is no feeling of tension 1 point ・ ・ Although there is a little moist feeling, you feel a little feeling of feeling 0 points ・ ・ I feel a feeling of tension

Furthermore, it judged as follows from the total score of all the panelists.
○ ・ ・ The total is 14 to 20 points, and there is no person who gave 0 points.
Δ ·· The total is 7 to 13 points.
× ·· The total is 0 to 6 points.

(5) Disintegration After 10 solid soaps were immersed in water at 25 ° C. for 1 hour, they were dried for 2 hours, and the surface state of each solid soap was visually observed and evaluated according to the following criteria.
Accepted product: The surface is soft, but the inside is in a hard state, and almost no melting occurs.
Rejected product: softened to the inside and melted down.

Furthermore, it determined as follows from the number of acceptable products.
○ ・ ・ There are 8 or more acceptable products.
Δ ··· 6 to 7 acceptable products.
× ·· There are 5 or less acceptable products.

(6) Storage stability Ten solid soaps were exposed to air and stored for 3 months at 25 ° C. and 40 ° C., respectively, and the appearance of each solid soap was visually observed and evaluated according to the following criteria.
Accepted product: No change in appearance and odor under any temperature condition.
Non-acceptable product: Slightly colored or cracked or slightly deteriorated odor at any temperature condition.

Furthermore, it determined as follows from the number of acceptable products.
○ ・ ・ 9 or more acceptable products.
Δ ··· There are 7 to 8 acceptable products.
× ·· There are 6 or less acceptable products.

(7) Productivity After molding 10 solid soaps using an extruder and stamping machine in accordance with the above production example, the presence or absence of deposits on the mold is visually observed, and each individual molded product is further examined. The appearance of the soap was visually observed and judged according to the following criteria.
Accepted product: There is no deposit on the mold, and no cracks are seen on the soap surface after molding.
Defective product: There are deposits on the mold or cracks on the soap surface after molding.

Furthermore, it determined as follows from the number of acceptable products.
○ ・ ・ The number of acceptable products is 9 or more. △ ・ ・ The number of acceptable products is 7 to 8. × ・ ・ The number of acceptable products is 6 or less.

  The solid soap of Comparative Example 1 does not contain polyethylene glycol a and b, and is composed only of a fatty acid salt. Therefore, the evaluation of foam quality and productivity is low, and the evaluation of durability of foam quality and feeling after use is poor. It was. Since the solid soap of Comparative Example 2 does not contain polyethylene glycol b having a Mn of 1,000,000 to 5,000,000, the foam quality sustainability and the feeling of use after washing were low. Similarly, since the solid soap of Comparative Example 3 does not contain polyethylene glycol a having a Mn of 200,000 to 600,000, evaluation of foam quality, its durability, and feeling after washing was low. Moreover, since the solid soap of Comparative Example 4 contained an unsaturated fatty acid salt (oleate), foaming, solid soap dissolution, and storage stability were poorly evaluated.

  On the other hand, in Examples 1 to 7, foaming, foam quality, its durability, feeling after washing, melting / disintegration of solid soap, storage stability, and productivity at the time of production were good. .

Claims (2)

The number of polyethylene glycol a0.01~1 weight% of an average molecular weight from 200,000 to 600,000, a number average molecular weight from 1 million to 5 million polyethylene glycol b0.005~0.5 wt%, saturated fatty acid salts from 98.5 to 99. A solid soap composition comprising 985% by weight ,
The saturated fatty acid constituting the saturated fatty acid salt is composed of 5-50% by mass of lauric acid, 40-80% by mass of myristic acid, 5-20% by mass of palmitic acid, and the total amount of lauric acid, myristic acid and palmitic acid is 100. The saturated fatty acid salt is a salt obtained by reacting the saturated fatty acid with a base composed of sodium and potassium, and the mass ratio of sodium / potassium reacted with the saturated fatty acid is 99/1 to 50 / 50 solid soap composition . The solid soap composition with respect to 100 parts by weight of claim 1 bar soap composition, further the aloe extract or seaweed extract containing 0.01 to 2 parts by weight.