JPH0253090B2 - - Google Patents

Description

[Detailed description of the invention]

This invention relates to emulsifier compositions applied to emulsion products such as creams and lotions. Conventionally, emulsion products such as creams and lotions have been prepared by appropriately selecting and using lipophilic emulsifiers and hydrophilic emulsifiers.
That is, emulsions have been prepared by selecting emulsifiers depending on the required hydrophilic-lipophilic balance of the oily components of the emulsion. In particular, compositions in which anionic surfactants, mainly fatty acid soaps, are combined with ether-type, ester-type, or amide-type nonionic surfactants are widely used as emulsifiers for preparing emulsions. However, these emulsifier compositions do not meet the required properties of emulsifier compositions, namely (1) good dispersion stability of the emulsion at high and low temperatures, and (2) good viscosity stability of the emulsion at high and low temperatures. It does not fully satisfy the following two criteria: being excellent. In an attempt to improve the stability of emulsions at high temperatures, a mixture of a basic amino acid salt of a fatty acid and a polyhydric alcohol fatty acid ester has been used (Japanese Patent Laid-Open No. 127132/1982). however,
With this emulsifier composition, the emulsion is 40
It is stable without being destroyed even if stored at 45°C for 1 month, but if stored at a higher temperature of 45°C for 1 month,
Also, the dispersion stability and viscosity stability of the emulsion when stored at -5°C are poor. The object of this invention is to provide an emulsifier composition that allows the production of emulsions with good dispersion and viscosity stability even at high and low temperatures. That is, the present invention provides an emulsifier composition containing a mono-N-long chain acyl basic amino acid lower alkyl ester salt and a polyhydric alcohol fatty acid ester. Examples of the basic amino acids constituting the mono-N-long chain acyl basic amino acid lower alkyl ester salt, which is the first essential component of the composition of the present invention, include natural amino acids such as orthinine, lysine, and arginine. Also, for example, α, γ
-Synthetic amino acids such as diaminobutyric acid can be used as well. These may be optically active or racemic. The acyl group constituting the mono N-long chain acyl basic amino acid lower alkyl ester salt has 8 carbon atoms.
to 22 saturated or unsaturated fatty acid residues.
These may be natural or synthetic. For example, single fatty acid residues such as lauroyl, myristyl, palmitoyl and stearoyl groups as well as natural mixed fatty acid residues such as coconut oil fatty acid residues and beef tallow fatty acid residues can be employed. Mono N-long chain acyl basic lower alkyl ester salts include inorganic acid salts such as hydrochloride or sulfate, or, for example, acetate, tartrate, citrate, p-toluenesulfonate, fatty acid salt, Acidic amino acid salts or organic acid salts such as pyroglutamate can be employed. Among these, hydrochloride and L- or DL-pyrrolidone carboxylate are preferred. Suitable lower alkyl ester moieties include methyl ester, ethyl ester, propyl ester, butyl ester, pentyl ester, hexyl ester, heptyl ester and octyl ester. The polyhydric alcohol fatty acid ester, which is the second essential component of this invention, is a reaction product obtained by reacting a polyhydric alcohol and a fatty acid. The ester obtained by this reaction is a mixture of partially esterified monoesters, diesters, triesters, tetraesters, pentaesters, etc., and such mixed esters can be conveniently used in the composition of the present invention. Can be done. However, it goes without saying that a pure single polyhydric alcohol fatty acid ester can be used. Preferred specific examples of polyhydric alcohols used to synthesize polyhydric alcohol fatty acid esters include glycerin, polyglycerin (diglycerin, triglycerin, tetraglycerin, pentaglycerin, hexaglycerin, heptaglycerin, octaglycerin, nonaglycerin). , decaglycerin, etc.) pentaerythritol, sorbitan, sorbitol, mannitol, sucrose, etc. Further, the fatty acids used to synthesize polyhydric alcohol fatty acids are straight chain saturated fatty acids and unsaturated fatty acids having side chains. Preferred fatty acids are caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, linoleic acid, linolenic acid, ricinoleic acid, isostearic acid, undecylenic acid, hydroxystearic acid, abietic acid, Isooctanoic acid, isohexadecanoic acid, 2
- ethylhexadecanoic acid and lanolin fatty acids. The ratio of mono N-long chain acyl basic lower alkyl ester salt and polyhydric alcohol fatty acid ester in the emulsifier composition of the present invention can be appropriately selected depending on the system to be emulsified, but usually the weight ratio The ratio ranges from 10:1 to 1:15, preferably from 5:1 to 1:10. The amount of the emulsifier composition of this invention to be used can be determined as appropriate depending on the system to be emulsified, but usually,
The mono N-long chain acyl basic amino acid lower alkyl ester salt in the emulsifier composition is used in an amount such that the emulsifier composition contains 0.1 to 10% by weight based on the total amount of the emulsion after emulsification. The emulsifier composition of this invention includes mineral oil, vegetable oil,
It is possible to uniformly emulsify oily components such as animal oils, waxes, and other synthetic ester oils, and to provide emulsions that exhibit good dispersion stability and viscosity stability even at high and low temperatures. Examples of emulsifiable oily components include hydrocarbons such as liquid paraffin, petrolatum, solid paraffin, squalane and olefin oligomers; isopropyl myristate, isopropyl palmitate,
Stearyl stearate, octyldodecyl myristate, octyldodecyl oleate and 2-
Esters such as ethylhexanoic acid triglyceride; Higher alcohols such as lauryl alcohol, cetyl alcohol, stearyl alcohol, and behenyl alcohol; Higher fatty acids such as palmitic acid, stearic acid, and behenic acid; Camellia oil, soybean oil, avocado oil, jojoba oil, and linseed oil and animal oils such as whale oil and mink oil. In addition, the emulsion emulsified with the emulsifier composition of this invention may contain preservatives, humectants, thickeners,
Desired O/W and W/O creams can be obtained by blending disinfectants, ultraviolet absorbers, pigments, fragrances, crude drug extracts, and other additives. Next, Examples and Comparative Examples of the present invention will be shown to explain the effects of the present invention more specifically. Before explaining each example, the test method employed in each example will be explained. Dispersion stability The emulsion made with the sample emulsifier composition is
After leaving it in a constant temperature bath at 45℃ and -5℃ for one month,
The state of particle aggregation was observed under a microscope at 400x magnification to evaluate dispersion stability. The evaluation is a four-level evaluation based on the following criteria. No aggregation: ◎ Good Slight aggregation: ○ Fairly good Aggregation: △ Normal Severe aggregation and coalescence of particles: × Poor viscosity stability The viscosity of the cloudy emulsion was measured using a B-type viscometer, and the viscosity was measured at 45°C and -5°C.
The viscosity was measured again after being left in a constant temperature bath at ℃ for one month, and the change in viscosity was calculated. The evaluation of viscosity stability is a four-stage evaluation based on the following criteria. Viscosity change is less than 500CP: ◎Good Viscosity change is 500 to 1000CP: 〇Slightly good Viscosity change is 1000 to 1500CP: △Normal Viscosity change is 1500CP or more: ×Bad Test example 1 Composition shown in Table 1 using an emulsifier composition (% by weight) was prepared and evaluated for dispersion stability and viscosity stability. The results are shown in the same table. From Table 1, even when a basic amino acid salt of a fatty acid and a polyhydric alcohol fatty acid ester were used together (Comparative Example 7), the viscosity stability was not good, and the mono-N-long chain acyl basic amino acid lower alkyl ester salt did not have good viscosity stability. It can be seen that when used together with a polyhydric alcohol fatty acid ester, the dispersion stability and viscosity stability are excellent.
In contrast, Comparative Examples 1 to 3, 5, which contain only one of the two essential components of the present invention,
6 cannot achieve the purpose of this invention. Furthermore, when using a mono-N-long chain acyl acidic amino acid salt (Comparative Example 7'), stability at high temperatures was good;
Low temperature stability is not good.

【table】

[Table] Test Example 2 An emulsion having the composition (wt%) shown in Table 2 was prepared using the emulsifier composition, and the dispersion stability and viscosity stability were evaluated. The results are shown in the same table. Table 2 shows that when a _C8 to _C22 mono-N-long chain acyl basic amino acid lower alkyl ester salt is used in combination with a polyhydric alcohol fatty acid ester, the dispersion stability and viscosity stability are excellent. On the other hand, Comparative Examples 8 and 9, which are a combination of a mono-N-long chain acyl basic amino acid lower alkyl ester salt with an alkyl chain length of 6 or 24 and a polyhydric alcohol fatty acid ester, cannot achieve the object of the present invention. .

【table】

[Table] Example 11 A cream having the composition shown in Table 3 was prepared,
Dispersion stability and viscosity stability were evaluated.

[Table] This cream showed excellent dispersion stability and viscosity stability at 45°C and -5°C. Example 12 A cleansing cream having the composition shown in Table 4 was prepared, and its dispersion stability and viscosity stability were evaluated.

【table】

[Table] This cleansing cream showed excellent dispersion stability and viscosity stability. Example 13 A hair treatment composition having the composition shown in Table 5 was prepared, and its dispersion stability and viscosity stability were evaluated.

[Table] This hair treatment composition showed excellent dispersion stability and viscosity stability. Example 14 Hair lotion compositions having the compositions shown in Table 6 were prepared and evaluated for dispersion stability and viscosity stability.

[Table] This hair lotion composition showed excellent dispersion stability and viscosity stability. Example 15 Hydrophilic ointment having the composition shown in Table 7 was prepared, and its dispersion stability and viscosity stability were evaluated.

[Table] This hydrophilic ointment showed excellent dispersion stability and viscosity stability.

Claims (1)

[Claims] 1. An emulsifier composition containing a mono-N-long chain acyl basic amino acid lower alkyl ester salt and a polyhydric alcohol fatty acid ester.