JPH0782589A - Detergent composition - Google Patents

Abstract

PURPOSE:To obtain a detergent compsn. which is excellent in foaming properties, foam quality, and temp. stability and is mild to the skin and hair by incorporating a choline N-acylglutamate into the compsn. CONSTITUTION:A detergent compsn. contg. a choline N-acylglutamate is provided. Since N-acylglutamates are mild to the skin and hair and hardly irritate a human body, they have been used as the main component of a solid soap, a shampoo, etc., known examples being an alkali metal salt, an alkanolamine salt, a basic amino acid salt, and an ammonium salt. However, the alkali metal salt has problems with depositing an insol. matter at low temp. and hardening; other above-mentioned salts are rather inferior in foaming properties to the alkali salt, discolor during storage, and release odor. On the other hand, using a choline as a counter ion of N-acylglutamate gives a detergent compsn. which is excellent in foaming properties, foam quality, and temp. stability and is mild to the skin and hair.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a detergent composition containing N-acylglutamate choline,
More specifically, the present invention relates to a cleansing composition having good foaming properties and foam quality and having improved temperature stability and mild to the skin and hair.

[0002]

2. Description of the Related Art N-acyl glutamate is widely used as a main component of detergents such as solid soap, shampoo and face washing foam because it is mild to skin and hair and has low irritation to the human body. Known salts include alkali metal salts such as sodium and potassium, alkanolamine salts such as triethanolamine, basic amino acid salts such as lysine and arginine, and ammonium salts.

However, the alkali metal salt has a foaming property.
Although it is excellent in foam quality, it has a high Kraft point, and there is a problem that insoluble matter is precipitated or hardened at a low temperature. On the other hand, alkanolamine salts, basic amino acid salts and ammonium salts have high solubility and excellent stability at low temperatures, but have slightly poorer foaming properties than alkali metal salts, and when stored at high temperatures for a long time, There is a problem in that coloring is caused and an odor is generated.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a cleansing composition which has a foaming property, a foam quality and a temperature stability and is mild to skin and hair.

[0005]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have found that the use of choline as a counter ion of N-acylglutamic acid achieves the intended purpose. The present invention has been completed.

That is, the present invention relates to a detergent composition containing choline N-acylglutamate.

The present invention will be described in detail below. The acyl group of choline N-acylglutamate used in the present invention is an acyl group derived from a saturated or unsaturated fatty acid having 8 to 20 carbon atoms, such as lauric acid, myristic acid,
Examples of the acyl group include fatty acids having a single chain length such as palmitic acid, stearic acid, and oleic acid. In addition to these, naturally occurring mixed fatty acids such as coconut oil fatty acid, tallow fatty acid, and hardened tallow fatty acid, or fatty acids obtained by synthesis. It may be an acyl group (including a branched fatty acid).

The degree of neutralization of the N-acylglutamate choline used in the detergent composition of the present invention varies depending on the type of the acyl group of N-acylglutamate and the product form of the detergent composition, but is usually 0.5. ~ 1.8, preferably 0.
8 to 1.5.

The N-acyl glutamic acid choline salt used in the present invention can also be obtained by neutralizing N-acyl glutamic acid with choline or by salt exchange between N-acyl glutamic acid salt and choline hydrochloride.

The amount of the N-acylglutamic acid choline salt compounded varies depending on the dosage form of the detergent composition, but is 1 to 30% by weight in the case of a liquid detergent and 3 to 40% by weight in the case of a pasty detergent. In the case of a solid detergent, it is preferably 10 to 90% by weight.

The detergent composition of the present invention contains, in addition to choline N-acylglutamate, alkali metal salts such as sodium and potassium, ammonium salts, alkanolamine salts such as triethanolamine, lysine, arginine and ornithine. It can also be used in combination with other N-acylglutamates such as basic amino acid salts.

The detergent composition of the present invention includes other surfactants such as alkyl sulfates, alkyl sulfonates, polyoxyethylene alkyl sulfates, alkylbenzene sulfonates, N-acyl-N-methyl taurine salts. , Α-olefin sulfonate, higher fatty acid salt, higher fatty acid ester sulfonate, anionic surfactant such as alkyl ether acetate, polyoxyethylene alkyl ether acetate, fatty acid amide, polyoxyethylene alkyl ether, sugar ester , Nonionic surfactants such as sugar ethers and sugar amides, and amphoteric surfactants such as imidazoline-based and betaine-based surfactants can be used in combination as long as the effects of the present invention are not impaired.

Further, as other additives, components usually used in detergent compositions can be used within a range that does not impair the effects of the present invention. For example, an oil component, an ultraviolet absorber, a moisturizer, a thickener, an antioxidant, a whitening agent, a fragrance, a dye, a preservative and the like can be added.

[0014]

EFFECTS OF THE INVENTION The detergent composition of the present invention is mild to skin and hair and has excellent temperature stability, and therefore, it can be suitably used as a hair shampoo, body shampoo and face wash foam.

[0015]

EXAMPLES Next, the present invention will be described in detail with reference to examples, but the present invention is not limited thereto. All percentages in the examples are based on weight.

Evaluation Method Each performance was measured by the following evaluation methods.

(Foaming power) The foaming power was measured by the loss miles test method (JIS K 3362). Measurement temperature is 4
At 0 ° C, sample concentration of 5.0%, height of foam after 5 minutes (m
l) was taken as the foaming power. The evaluation criteria are as follows. ◯: 240 ml or more Δ: 200 to less than 240 ml ×; Less than 200 ml

(Foam quality) Using about 15 people, about 40
A hand-washing test was conducted with warm water at ℃, and the creamyness of foam quality was judged. The evaluation was compared with a 10% aqueous solution of sodium N-lauroyl glutamate, and when it was higher than this, it was +1, when it was equivalent, and when it was inferior, -1 point. ○: 5 points or more △: -5 to less than 5 points x: less than -5 points

(Low-temperature stability) It was determined by leaving it at 0 ° C. for 24 hours for observation. For liquid detergent ○: No change in solubility △: Partially insoluble matter precipitated ×: Coagulated or clouded cream detergent ○: No change in hardness Δ: Slightly harder ×: It became hard (high temperature stability) by leaving it at 45 ° C. for 3 weeks and observing. For liquid detergent ○: No change in hue and odor △: Slight change in hue and odor ×: Change in hue and odor Creamy detergent ○: No separation Δ: Slight separation × :To separate

Example 1 Comparative Examples 1 to 3 Liquid detergents having the compositions shown in Table 1 were prepared and evaluated.

[0021]

[Table 1]

As is clear from Table 1, the liquid detergent of Comparative Example 1 containing sodium N-acylglutamate has poor low-temperature stability and crystals are precipitated, and ammonium salts of Comparative Examples 2 and 3 are produced. , The liquid detergent containing triethanolamine salt was colored at high temperature and had poor stability.
On the other hand, the liquid detergent of the present invention was satisfactory in all items.

Examples 2, 3 Comparative Examples 4, 5 Creamy detergents having the compositions shown in Table 2 were prepared and evaluated.

[0024]

[Table 2]

As is clear from Table 2, the creamy detergent containing sodium N-acylglutamate solidified at low temperature, and the one containing triethanolamine salt separated at high temperature. In contrast, the creamy detergent of the present invention was satisfactory in all items.

Example 4 A liquid detergent composition having the following composition was prepared and evaluated by the above-mentioned method. All items were satisfactory.

Hair shampoo

[Table 3]

Example 5 Body shampoo

[Table 4]

Example 6 Creamy cleaning agent

[Table 5]

Claims (1)

[Claims] 1. A detergent composition comprising choline N-acylglutamate.