JP3263984B2 - Liquid detergent composition - Google Patents

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 an N-acyl glutamate having a mild action on skin and hair. The present invention also relates to a liquid detergent composition containing an 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 skin and hair, in solid soaps, shampoos, cleansing foams, kitchen detergents, and the like. Most of them were used in the form of sodium salt or triethanolamine salt.

However, when an attempt is made to use the sodium salt of N-acylglutamic acid as a liquid detergent, insolubles precipitate at low temperatures because of its low solubility.

[0004] Therefore, when N-acyl glutamate is used as a liquid detergent, triethanolamine salts and ammonium salts are used as salts. But,
When these salts are used, there is a problem in that when they are stored at a high temperature, they are colored and odor is generated.

[0005] JP-A-56-28297 discloses N-
There is disclosed a water-soluble detergent composition having improved low-temperature stability due to a basic amine salt of acylglutamic acid, an imidazoline-type amphoteric surfactant, and an amidoamine-type amphoteric surfactant.In this case, a triethanolamine salt was used. As in the case, when stored for a long time at a high temperature, there are disadvantages such as discoloration and generation of an odor. Also, JP-A-61-233097 discloses that
There is a disclosure of a liquid detergent composition in which N-acylglutamic acid (salt) and an organic amine are blended to improve stability at low temperatures. I couldn't say it.

JP-A-57-109897 discloses N
There is disclosed a liquid detergent composition containing an acylglutamate salt and an N-acyl or N-alkylamino acid salt and having a pH of an aqueous solution of 5 to 7, but still has 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-acylglutamic acid, which has improved temperature stability while maintaining foamability and detergency.

[0008]

The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, have found that potassium ion is used as a counter ion of N-acylglutamic acid,
It has been found that by adjusting H to 5.5 to 8, a liquid detergent composition excellent in temperature stability without coloring and odor can be obtained without impairing foaming properties and detergency. It was completed.

That is, the present invention provides a liquid detergent composition containing N-acylglutamic acid salt, which contains 1.4 to 1.8 mol of a potassium ion as a counter ion with respect to 1 mol of N-acylglutamic acid, The present invention also relates to a liquid detergent composition wherein the pH of an aqueous solution of the composition is adjusted to 5.5 to 8.

Hereinafter, the present invention will be described in detail. The acyl group of the N-acyl glutamate 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 and oleic acid. And acyl groups of fatty acids (including branched fatty acids) obtained from natural mixed fatty acids such as coconut oil fatty acids, tallow fatty acids, and hardened tallow fatty acids, and synthetic fatty acids (including branched fatty acids). Is also good.

In the liquid detergent composition of the present invention, potassium ion is used as a counter ion in an amount of 1.4 to 1.8 mol, preferably 1.5 to 1.8 mol per 1 mol of N-acylglutamic acid.
It contains 1.8 mol, and 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-acylglutamic acid other than potassium ion include sodium and triethanolamine, and these are preferably less than 0.7 mol per mol of N-acylglutamic acid.

[0013] The liquid detergent composition of the present invention comprises, for example, N-
It can be prepared by suspending acylglutamic acid in water and adding potassium hydroxide. As the counter ion can be used in combination with potassium ions, sodium ions, such as triethanolamine.

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

The detergent composition of the present invention may contain other surfactants such as anionic surfactants such as N-acyl protein, alkyl sulfate, alkyl ether sulfate, and alkyl sulfoacetate as long as the effects of the present invention are not impaired. Surfactants, nonionic surfactants such as fatty acid alkylolamide and sugar ester, amphoteric surfactants such as betaine and imidazoline, and cationic surfactants can also be used in combination.

Further, other components used in ordinary cleaning agents such as propylene glycol, glycerin,
Humectants such as sorbitol; viscosity modifiers such as methylcellulose and ethanol; bactericides such as triclosan and trichlorocarban; potassium glycyrrhizinate; anti-inflammatory agents such as tocophenol acetate; preservatives such as methylparaben and butylparaben; , A protective colloid, an ultraviolet absorber, a whitening agent, a fragrance, a pigment, and the like.

[0017]

EFFECT OF THE INVENTION The liquid detergent composition of the present invention has low irritation to skin and ocular mucous membranes, has no coloration, does not have odor, and has excellent temperature stability. Can be used.

[0018]

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

(Foaming power) The foaming power was measured by the Ross Miles test method (JIS K 3362). Measurement temperature is 4
0 ° C., sample concentration 0.25%, height of foam (m
l) was defined as the foaming power. ○: 240 ml or more △; 200 to 240 ml ×; 200 ml or less

(Foam stability) Foam stability was determined by the retention of foam in the foaming test. That is, the height of the foam after 30 minutes (ml) / the height of the foam after 5 minutes (ml) × 100
(%) Was regarded as the foam stability. ；: 85% or more △; 75 to 85% ×; 75% or less

(Low-temperature stability) This was carried out by allowing the sample to stand at -5 ° C. for 3 weeks and observing it. ◎: No change in solution state ○: Slightly turbid △: Partially precipitated ×: Coagulated or cloudy

(High-temperature stability) The test was left at 50 ° C. for 3 weeks and observed for changes in hue and odor. ；: No change in hue and odor at all △: slight change in hue and odor ×: significant change in hue and odor

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

[0024]

[Table 1]

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

Examples 4 to 5 and Comparative Examples 6 to 8 Liquid detergent compositions were prepared by changing the degree of neutralization and the pH of potassium N-cocoylglutamate, and tested by the methods described above. Table 2 shows the results.

[0027]

[Table 2]

As shown in Table 2, the degree of neutralization is from 1.4 to 1.
8, good performance was exhibited at pH 5.5 to 8.

Example 6 The following kitchen detergent composition was prepared and tested for performance.

Kitchen detergent composition Potassium N-lauroylglutamate (degree of neutralization 1.5) 15.0 parts laurylamine oxide 3.0 coconut oil fatty acid diethanolamide 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 Remaining pH = 6.5

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

Example 7 The following shampoos were prepared and tested for performance.

Shampoo composition Potassium N-cocoylglutamate (neutralization degree 1.6) 18.0 parts Coconut oil fatty acid diethanolamide 4.0 1.3 Butylene glycol 5.0 Cationized cellulose 0.0 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 8 The following shampoos were prepared and tested for performance.

Shampoo composition potassium N-lauroylglutamate (degree of neutralization 1.5) 10.0 parts N-cocoylglutamate triethanolamine (degree of neutralization 1.2) 5.0 coconut oil fatty acid diethanolamide 2. 0 Carboxyvinyl polymer 1.5 Glycerin 5.0 Preservative 0.3 Fragrance 0.1 Purified water Remainder pH = 6.1

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

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

Body Shampoo Composition Potassium N-Lauroyl Glutamate (Neutralization Degree 1.7) 12.0 Parts Potassium N-Cocoyl Glutamate (Degree of Neutralization 1.7) 10.0 Laurenic Ethanolamide 4.0 1 0.3-butylene glycol 5.0 hydroxypropylcellulose 0.5 dl-sodium pyrrolidonecarboxylate 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 10 The following body shampoo was prepared and tested for performance.

Body Shampoo-Composition Potassium N-Cocoyl Glutamate (Neutralization Degree 1.8) 15.0 Parts Sodium N-Cocoyl Glutamate (Degree of Neutralization 1.2) 5.0 Cocoamidopropyl Betained 2.0 Monococo Oil fatty acid polyoxyethylene (80) methyl glucose 5.0 Propylene glycol 8.0 Preservative 0.3 Perfume 0.1 Purified water Remaining pH = 6.5

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

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-56-76500 (JP, A) JP-A-63-183519 (JP, A) JP-A-57-109897 (JP, A) JP-A-3-3 281699 (JP, A) JP-A-1-272697 (JP, A) JP-A-61-233097 (JP, A) JP-B-59-551 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) C11D 1/10 A61K 7/075 A61K 7/50

Claims (1)

(57) [Claims] 1. A liquid detergent composition containing an N-acylglutamic acid salt, wherein potassium ion is used as a counter ion in an amount of from 1.4 to 1 mol of N-acylglutamic acid.
1.8 mol, and the pH of the aqueous solution of the composition is 5.
A liquid detergent composition adjusted to 5 to 8.