Detergent composition

Abstract: A detergent composition containing a salt of an anionic surfactant with a basic amino acid and containing from 0.005 to 10% by weight of a water-soluble reducing agent and/or from 0.005 to 10% by weight of a chelating agent. The composition is not so stimulative to the skin and mucous membrane and is free from the offensive odor of the basic amino acid therein.

Description: SPECIFICATION A detergent composition containing a salt of an anionic surfactant with a basic amino acid and containing from 0.005 to 10 % by weight of a water-soluble reducing agent and/or from 0.005 to 10 % by weight of a chelating agent. Field of the Invention The present invention relates to a detergent composition containing a salt of an anionic surfactant with a basic amino acid. Prior Art An attempt has heretofore been made to incorporate a salt of an anionic surfactant with a basic amino acid into various detergent compositions, since the salt is not so stimulative to the skin or mucous membrane (for example, as proposed in Japanese Patent Application Laid-Open Nos. 56-53196 and 58-168695). However, detergent compositions containing a salt of an anionic surfactant with a basic amino acid are difficult to put to practical use because of their poor storage stability and the offensive odor resulting from the basic amino acid. The object of the present invention is to stabilize a detergent composition containing a salt of an anionic surfactant with a basic amino acid and to provide an odorless detergent composition containing the same. The present inventors earnestly investigated for the purpose of solving the preceding problems and, as a result, have found that a detergent composition which contains a salt of an anionic surfactant with a basic amino acid and which is free from the offensive odor resulting from the basic amino acid may be obtained by incorporating from 0.005 to 10 % by weight of a water-soluble reducing agent and/or from 0.005 to 10 % by weight of a chelating agent to the composition. On the basis of the finding, they have completed the present invention. Specifically, the present invention relates to a detergent composition containing a salt of an anionic surfactant with a basic amino acid and containing from 0.005 to 10 % by weight of a water-soluble reducing agent and/or from 0.005 to 10 % by weight of a chelating agent. The basic amino acid as referred to herein is an amino acid having basic side chain(s), such as lysine, arginine, ornithine, hydroxylysine and histidine. The anionic surfactant for use in the present invention is a surfactant having at least one active group of -COO-, -OSO₃-, -SO₃-, -OPO 3 2 - and -O(O)PO₂-. It includes, for example, fatty acids, N-acylglutamic acids, polyoxyethylene higher alcohol sulfate esters, high alcohol sulfate esters, alkylbenzenesulfonic acids, polyoxyethylene higher alcohol phosphate esters, high alcohol phosphate esters, monoalkylphosphoric acids, N-acylsarcosines, N-acyltaurins, isethionic acid high fatty acid esters, and higher alcohol sulfosuccinate esters. The salt of a basic amino acid and an anionic surfactant may be obtained with ease by blending a basic amino acid and an anionic surfactant in a suitable solvent or in the absence of a solvent. The water-soluble reducing agent for use in the present invention includes, for example, sulfites, thiosulfates, phosphites, hypophosphites, ascorbic acid and its derivatives. These may be used singly or in combination of them. The concentration of the water-soluble reducing agent in the composition of the present invention varies, depending upon the kind of the agent and the kind and amount of the salt of a basic amino acid and an anionic surfactant to be in the composition. It is from 0.005 to 10 % by weight ("% by weight" is hereinafter simply referred to as "%"), preferably from 0.01 to 5 %. If it is less than 0.005 %, the effect of the agent for stabilizing the composition would be insufficient. If, however, it is more than 10 %, the detergency of the composition would unfavorably lower. The chelating agent for use in the present invention includes, for example, ethylenediaminetetraacetic acid (EDTA), ethyleneglycol-bis (2-aminoethylether) tetraacetic acid, 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP), ethylenediamine-tetra(methylenephosphonic acid), tripolyphosphoric acid, hexametaphosphoric acid, dihydroxyethylglycine, gluconic acid, saccharic acid, tartaric acid, citric acid and salts of them. These may be used singly or in combination of them. The concentration of the chelating agent in the composition of the present invention varies, depending upon the kind of the agent and the kind and amount of the salt of a basic amino acid and an anionic surfactant to be in the composition. It is from 0.005 to 10 %, preferably from 0.01 to 3 %. If it is less than 0.005 %, the effect of the agent for stabilizing the composition would be insufficient. If, however, it is more than 10 %, the chelating agent would often cause stimulation of the skin unfavorably. The detergent composition of the present invention may optionally contain any other surfactant(s) selected from, for example, nonionic surfactants, cationic surfactants and amphoteric surfactants, in combination with the anionic surfactant. In addition, it may further contain, if desired, any other conventional components for detergents, for example, a moisturizer such as propylene glycol, glycerin or sorbitol; a viscosity adjusting agent such as methyl cellulose or ethanol; a microbicide such as triclosan or trichlorocarbam; an anti-inflammatory agent such as sodium glycyrrhetinate or tocopherol acetate; an antiseptic such as methylparaben or butylparaben; as well as an antifoaming agent, a protective colloidal agent, an ultraviolet absorbent, a whitening agent, a perfume and a dye, each in such a range that would not detract from the effect of the effect of the present invention. The detergent composition of the present invention may be formed into any preparation form for any ordinary use, such as solid, paste or liquid, by any ordinary method. Since the detergent composition of the present invention is not so stimulative to the skin and mucous membrane and is free from the offensive odor of basic amino acids, it may be used favorably as a solid soap, a body shampoo, a hair shampoo and a kitchen detergent. Examples The present invention will be explained in detail by way of the following examples. Determination of the odor of the samples as prepared by the following examples was effected by the sensual test by panelists of 10 men and 10 women. For evaluating the samples in the test, o ○ indicates no odor, O indicates almost no odor, ▵ indicates a little odor, and x indicates an offensive odor. Example 1 A water-soluble reducing agent and a chelating agent as shown in Table 1 below were added to 50 g of 30 % aqueous solution of L-lysine salt of coconut oil fatty acid and stored at 40°C for one month, whereupon the odor of each sample composition was determined. The results obtained are shown in Table 1. Example 2 Water was added to 30 parts of a salt of an anionic surfactant with a basic amino acid as shown in Table 2 below and a water-soluble reducing agent (mixture of Na₂S₂O₃/Na₂SO₃ = 5/1) also shown in the same table to make 100 parts in all. They were dissolved and cooled to room temperature. The odor of each of the detergent compositions thus prepared was determined. The results are shown in Table 2. Example 3: Face Wash Foam Components (A): Lysine salt of lauric acid 20 % Polyethylene glycol 600 10 Polyethylene glycol monostearate 5 Polyoxyethylene(20) sorbitanmonostearate 3 1,3-Butylene glycol 10 Sodium sulfite 0.1 Sodium thiosulfate balance Component (B): Perfume ad lib. The components (A) were blended and dissolved at 80°C. The resulting blend was cooled with stirring, and the component (B) was added thereto at 60°C. After cooled to 30°C, a face wash foam was obtained. This was free from the offensive odor of the basic amino acid. Example 4: Solid Soap Component (A): Lysine salt of lauric acid 85 % Components (B): Cetanol 5 Pure water 9.1 Components (C): Sodium sulfite 0.1 Sodium thiosulfate 0.5 EDTA.2Na 0.3 The components (B) were dissolved under heat at 80°C. The resulting blend was cooled with stirring, and the components (C) were added thereto at 60°C and cooled to 30°C. The component (A) was then added to the blend, uniformly kneaded with rolls and applied to an extruder. The extruded blend was shaped by stamping to obtain solid soaps. These were free from the offensive odor of the basic amino acid. Example 5: Solid Soap Lysine salt of coconut oil fatty acid 25 % Soap base (water content 8 %) 70 Sodium sulfite 0.1 Sodium thiosulfate 0.5 Pure water balance The aforesaid components were blended, uniformly kneaded with rolls and applied to an extruder. The extruded blend was shaped by stamping to obtain solid soaps. These were free from the offensive odor of the basic amino acid. Example 6: Solid Soap Components (A): Lysine salt of lauric acid 41 % Sodium α-olefinsulfonate 41 Components (B): Behenyl alcohol 8 Pure water balance Components (C): Sodium sulfite 0.1 Magnesium ascorbate phosphate 0.5 HEDP 0.1 From the aforesaid components were obtained solid soaps in the same manner as in Example 4. These were free from the offensive odor of the basic amino acid. Example 7: Solid Soap Components (A): Lysine salt of lauric acid 70 % Sodium isethionate 15 Component (C): HEDP 0.1 From the aforesaid components were obtained solid soaps in the same manner as in Example 4. These were free from the offensive odor of the basic amino acid. Example 8: Solid Soap Components (A): Lysine salt of lauric acid 70 % N-hardened beef tallow fatty acid sodium glutaminate 15 Components (B): Cetanol 5 Pure water balance Components (C): Tocopherol 0.1 Sodium thiosulfate 0.5 HEDP 0.1 EDTA.2Na 0.3 From the aforesaid components were obtained solid soaps in the same manner as in Example 4. These were free from the offensive odor of the basic amino acid. Example 9: Hair Shampoo Components (A): Lysine salt of lauric acid (30 % aqueous solution) 40 % Coconut oil fatty acid diethanolamide 5 Propylene glycol 3 Pyrrolidone-carboxylic acid 2 Polyoxyethylene(40) lanolin alcohol 1 Cationated cellulose 0.3 Antiseptic ad lib. Components (B): Tocopherol acetate 0.1 Sodium sulfite 0.1 Sodium thiosulfate 0.5 HEDP 0.1 EDTA.2Na 0.3 Pure water balance Component (C): Perfume ad lib. The components (A) and (C) were dissolved under heat at 80°C. The blend was cooled with stirring, and the component (C) was added thereto at 60°C. After cooled to 30°C, a hair shampoo-was obtained. This was free from the offensive odor of the basic amino acid. Example 10: Body Shampoo Lysine salt of coconut oil fatty acid (35 % aqueous solution) 60 % Coconut oil fatty acid diethanolamide 5 1,3-Butylene glycol 5 Sodium sulfite 0.1 Sodium thiosulfate 0.5 HEDP 0.1 EDTA.2Na 0.1 Perfume ad lib. Antiseptic ad lib. Pure water balance The body shampoo obtained from the aforesaid components was free from the offensive odor of the basic amino acid. Example 11: Kitchen Detergent Lysine salt of coconut oil fatty acid (35 % aqueous solution) 60 % Coconut oil fatty acid diethanolamide 5 1,3-Butylene glycol 5 Hydroxyethyl Cellulose 3 Sodium sulfite 0.1 Sodium thiosulfate 0.5 Perfume ad lib. Antiseptic ad lib. Pure water balance The kitchen detergent obtained the aforesaid components was free from the offensive odor of the basic amino acid.

Claims: Claims for the following Contracting States : DE, FR, GB A detergent composition containing a salt of an anionic surfactant with a basic amino acid and containing from 0.005 to 10 % by weight of a water-soluble reducing agent and/or from 0.005 to 10 % by weight of a chelating agent. The detergent composition of claim 1, wherein said water-soluble reducing agent is selected from the group consisting of sulfites, thiosulfates, phosphites, hypophosphites and ascorbic acid. The detergent composition of claim 1, wherein said water-soluble reducing agent is present in an amount of 0.01 to 5% by weight, based on the total weight of the composition. The detergent composition of claim 1, wherein said chelating agent is selected from the group consisting of ethylenediaminetetraacetic acid, ethyleneglycol-bis(2-aminoethylether)tetraacetic acid, 1-hydroxyethylidene-1,1-diphosphonic acid, ethylenediaminetetra(methylenephosphonic acid), tripolyphosphoric acid, hexametaphosphoric acid, dihydroxyethylglycine, gluconic acid, saccharic acid, tartaric acid, citric acid and salts thereof. The detergent composition of claim 1, wherein said chelating agent is present in an amount of 0.01 to 3 % by weight, based on the total weight of the composition. Claims for the following Contracting State : ES A process for producing a stabilized detergent composition which comprising mixing a salt of an anionic surfactant with a basic amino acid with 0.005 to 10 % by wt. of a water-soluble reducing agent and/or from 0.005 to 10 % by wt. of a chelating agent. A process according to claim 1, wherein the salt of an anionic surfactant with a basic amino acid is obtained by blending a basic amino acid and an anionic surfactant in a suitable solvent or in the absence of a solvent. A process according to claim 1 or claim 2, wherein the composition is further added with another surfactant. A process according to any of the claims 1 to 3, wherein the stabilized detergent composition is prepared in the form of a solid, paste or liquid.

Inventors: SANO KEIGO, TAKANO SHINICHI, SANO, KEIGO, TAKANO, SHINICHI, Sano, Keigo, c/o Cent. Res. Lab. Ajinomoto Co., TAKANO, SHINICHI C/O CENT. RES. LAB. AJINOMOTO CO.
Applicants: AJINOMOTO KK, AJINOMOTO CO., INC.
Application year: 1993
Main classification: C11D1
IPC codes: C11D1, C11D3, A61K8, C11D9, A61Q19, A61Q5