JPH0649481A - Liquid detergent composition - Google Patents

Abstract

PURPOSE:To provide a liquid detergent composition low in irritancy to the skin or hair, excellent in stability to temperatures, formulated with N- acylglutamic acid and potassium ion as counterion at specified proportion to adjust the pH value. CONSTITUTION:The detergent composition formulated with (A) one mole of N-acylglutamic acid and (B) 0.7-1.8 (pref. 1.2-1.8) mole of potassium ion to adjust the pH value of the aqueous solution to 5.5-8 (pref. 6.5-7.5).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid detergent composition containing N-acylglutamate, which has a mild action on skin and hair, and more specifically, it maintains foamability and detergency. At the same time, it relates to a liquid detergent composition containing N-acyl glutamate having improved temperature stability.

[0002]

2. Description of the Related Art N-acyl glutamate is used as an anionic surfactant having a very mild action on the skin and hair in solid soap, shampoo, cleansing foam, kitchen detergent, etc. Most of them were used in the form of sodium salt and triethanolamine salt.

However, if the sodium salt of N-acyl glutamic acid is used for the liquid detergent, the solubility is low, and insoluble matter is deposited at low temperature.

Therefore, when N-acylglutamate is used as a liquid detergent, triethanolamine salt or ammonium salt is used as the salt. But,
When these salts are used, when they are stored at a high temperature, they are colored and odor is generated.

Japanese Patent Laid-Open No. 56-28297 discloses N-
There is a disclosure of a water-soluble detergent composition having improved low-temperature stability due to a basic amine salt of acylglutamic acid, an imidazoline-type amphoteric activator, and an amidoamine-type amphoteric activator. In this case, a triethanolamine salt was used. As in the case, there are drawbacks such as discoloration and nasty smell when stored at high temperature for a long time. Further, JP-A-61-233097 discloses that
There is a disclosure of a liquid detergent composition in which N-acyl glutamic acid (salt) and an organic amine are blended to improve the low temperature stability. I couldn't say it.

Japanese Unexamined Patent Publication (Kokai) No. 57-109897 discloses N
There is a disclosure of a liquid detergent composition containing -acylglutamate and N-acyl, N-alkylamino acid salt, and an aqueous solution having a pH of 5 to 7, but there is still a problem in temperature stability.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid detergent composition containing N-acyl glutamic acid, which has improved foaming property and detergency and improved temperature stability.

[0008]

Means for Solving the Problems As a result of intensive studies for solving the above-mentioned problems, the present inventors have used potassium ion as a counter ion of N-acylglutamic acid, and
It has been found that by adjusting H to 5.5 to 8, a liquid detergent composition having excellent temperature stability without coloring and odor can be obtained without impairing foamability and washability, and the present invention is obtained. It came to completion.

That is, the present invention provides a liquid detergent composition containing N-acyl glutamate containing 0.7 to 1.8 mol of potassium ion as a counter ion per 1 mol of N-acyl glutamate. The present invention also relates to a liquid detergent composition in which the pH of an aqueous solution of the composition is adjusted to 5.5-8.

The present invention will be described in detail below. The acyl group of the N-acylglutamate used in the present invention is an acyl group derived from a saturated or unsaturated fatty acid having 7 to 22 carbon atoms, such as lauric acid, palmitic acid, stearic acid or oleic acid. Examples of the acyl group include a fatty acid having one composition. In addition to this, an acyl group of a naturally occurring mixed fatty acid such as coconut oil fatty acid, tallow fatty acid, and hardened tallow fatty acid, or a synthetically obtained fatty acid (including a branched fatty acid), Good.

In the liquid detergent composition of the present invention, potassium ion as a counter ion is 0.7 to 1.8 mol, preferably 1.2 to 1 mol, relative to 1 mol of N-acylglutamic acid.
The pH of the aqueous solution is 5.5 to 8, preferably 6 to 8, and more preferably 6.5 to 7.5.

Examples of the counter ion of N-acyl glutamic acid other than potassium ion include sodium and triethanolamine, but these are preferably less than 0.7 mol per mol of N-acyl glutamic acid.

The liquid detergent composition of the present invention is, for example, N-
It can be prepared by suspending acylglutamic acid in water and adding potassium hydroxide. In addition, examples of the counter ion that can be used in combination with potassium ion include sodium ion and triethanolammonium ion.

The blending amount of N-acylglutamic acid varies depending on the purpose of the product, the type of acyl group, and the degree of neutralization, but is 3 to.
30% is preferable.

In the detergent composition of the present invention, other surfactants such as N-acyl protein, alkyl sulfates, alkyl ether sulfates, alkyl sulfoacetates and the like are contained in the anionic interface as long as the effects of the present invention are not impaired. It is also possible to use a combination of an activator, a nonionic surfactant such as fatty acid alkylolamide and sugar ester, an amphoteric surfactant such as betaine-based and imidazoline-based, and a cationic surfactant.

In addition to these, other components used in ordinary detergents such as propylene glycol, glycerin,
Moisturizers such as sorbitol; viscosity modifiers such as methyl cellulose and ethanol; bactericides such as triclosan and trichlorocarbane; potassium glycyrrhizinate; anti-inflammatory agents such as tocophenol acetate acetate; preservatives such as methyl paraben and butyl paraben; other antifoaming agents , A protective colloid agent, an ultraviolet absorber, a whitening agent, a fragrance, a dye and the like can be added.

[0017]

The liquid detergent composition of the present invention is particularly suitable as a body shampoo, a hair shampoo, and a kitchen detergent because it has low irritation to the skin and eye mucous membranes, no coloring, no odor, and excellent temperature stability. Can be used for.

[0018]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to the examples. The effect was measured by the following test method and evaluation method. All percentages in the examples are based on weight.

(Foaming power) The foaming power was measured by the loss miles test method (JIS K 3362). Measurement temperature is 4
At 0 ° C., the sample concentration is 0.25%, the height of the foam after 5 minutes (m
l) was taken as the foaming power. ◯: 240 ml or more Δ: 200 to 240 ml ×; 200 ml or less

(Foam Stability) The foam stability depends on the foam retention rate in the above-mentioned foaming power test. That is, height of foam after 30 minutes (ml) / 5 height of foam after 5 minutes (ml) × 100
(%) Was defined as foam stability. ○: 85% or more △: 75 to 85% ×; 75% or less

(Stability at low temperature) It was carried out by observing after leaving at -5 ° C for 3 weeks. ⊚: No change in solubility ○: Slightly cloudy △: Partially precipitated ×: Coagulated or clouded

(Stability at high temperature) It was carried out by leaving it at 50 ° C. for 3 weeks and observing changes in hue and odor. ○: No change in hue or odor at all △: Slight change in hue or odor observed ×: Significant change in hue or odor

Examples 1 to 3 and Comparative Examples 1 to 5 Eight types of liquid detergent compositions having the compositions shown in Table 1 were prepared and tested by the method described above. The number of moles of counterion to 1 mole of N-acylglutamic acid was represented by the degree of neutralization.

[0024]

[Table 1]

As is clear from Table 1, the sodium N-acylglutamates of Comparative Examples 1 to 3 do not have sufficient low temperature stability, and the ammonium salts and triethano-amine salts of Comparative Examples 4 and 5 have low temperature stability. Good but inferior in high temperature stability.
On the other hand, Examples 1 to 3 of the present invention satisfy all the items.

Examples 4 to 6 and Comparative Examples 6 and 7 Liquid detergent compositions having different degrees of neutralization and pH of potassium N-cocoylglutamate were prepared and tested by the method described above. The results are shown in Table 2.

[0027]

[Table 2]

As shown in Table 2, the degree of neutralization of 1.2-1.
8 and pH 5.5-5 showed good performance.

Example 7 The following kitchen cleaning composition was prepared and tested for performance.

Kitchen cleaning composition N-lauroylglutamate potassium (neutralization degree 1.5) 15.0 parts Lauryl amine oxide 3.0 Coconut oil fatty acid dietanolamide 5.0 POE (5) Sodium lauryl ether sulfate 8 0.0 Urea 1.0 Preservative 0.3 Perfume 0.1 Dye Appropriate amount Purified water Balance pH = 6.5

The composition shown above was excellent in foaming power, high temperature stability and low temperature stability. When citric acid was added to Example 7 to lower the pH to 5.0 and stored at low temperature, crystals were precipitated and low-temperature stability was poor.

Example 8 A shampoo shown below was prepared and tested for performance.

Shamp-composition N-cocoyl glutamate potassium (neutralization degree 1.6) 18.0 parts Coconut oil fatty acid dietanolamide 4.0 1.3 Butylene glycol 5.0 Cationized cellulose 0. 5 Polyethylene glycol distearate 1.2 Preservative 0.3 Perfume 0.2 Purified water balance pH = 6.8

The composition shown above was excellent in foaming power and temperature stability.

Example 9 The following shampoo was prepared and tested for performance.

Shamp-composition N-lauroylglutamate potassium (neutralization degree 1.5) 10.0 parts N-cocoyl glutamate triethanolamine (neutralization degree 1.2) 5.0 Coconut oil fatty acid dietanolamide 2. 0 Carboxyvinyl polymer 1.5 Glycerin 5.0 Preservative 0.3 Perfume 0.1 Purified water balance pH = 6.1

The composition shown above was excellent in foaming power and temperature stability.

Example 10 The following body shampoo was prepared and tested for performance.

Body shampoo-composition N-lauroylglutamate potassium (neutralization degree 1.7) 12.0 parts N-cocoyl glutamate potassium (neutralization degree 1.7) 10.0 Lauric acid dietanolamide 4.0 1 .3-butylene glycol 5.0 hydroxypropyl cellulose 0.5 dl-pyrrolidonecarboxylate sodium 2.0 preservative 0.2 perfume 0.2 purified water balance pH = 7.2

The composition shown above was excellent in foaming power and temperature stability.

Example 11 A body shampoo shown below was prepared and tested for performance.

Body shampoo-composition N-cocoyl glutamate potassium (neutralization degree 1.8) 15.0 parts N-cocoyl glutamate sodium (neutralization degree 1.2) 5.0 cocoamidopropyl betaind 2.0 mono palm Oil fatty acid Polyoxyethylene (80) Methyl glucose 5.0 Propylene glycol 8.0 Preservative 0.3 Perfume 0.1 Purified water balance pH = 6.5

The composition shown above was excellent in foaming power and temperature stability.

Claims (1)

[Claims] 1. A liquid detergent composition containing N-acyl glutamate, wherein potassium ion as a counter ion is 0.7 to 1 mol with respect to 1 mol of N-acyl glutamate.
It contains 1.8 mol and the aqueous solution of the composition has a pH of 5.
A liquid detergent composition adjusted to 5 to 8.