Detergent composition

Abstract: A detergent composition which has an excellent detergency against muddy dirt of clothing which comprises (a) nonionic surfactant and (b) N-alkylamino sulfonate with weight ratio of (a) to (b) in the range of 1/10 to 10/1.

Description: Field of the Invention: The present invention relates to a detergent composition, particularly to a detergent composition which has an excellent detergency against clothing stained with inorganic dirt. Description of the Prior Art: Clothing dirt can be divided mostly into a) organic dirt and b) inorganic dirt. The organic dirt consists mainly of sebaceous dirt from the human body in the case of clothing such as underwear. A detergent composition comprising nonionic surfactant has an excellent detergency against oily dirt such as sebaceous dirt. On the other hand, the inorganic dirt consists mainly of mud originated from dust suspended in the air or soil. In general, clothing dirt or stain is a mixture of the organic dirt and the inorganic dirt. Up to the present, various studies have been conducted in order to enhance the detergency against the inorganic dirt. For example, Japanese Laid-Open Nos. 54-39411 and 54-130509 disclose a combined use of certain water soluble cationic surfactants. Japanese Laid-Open Nos. 51-142489 and 56-150048 disclose a combined use of certain amphoteric surfactants. Japanese Laid-Open No. 53-104582 discloses a combined use of carboxy alkylated alkylether-type anionic surfactants. However, the detergents mentioned above do not have sufficient detergency against the inorganic dirt, especially against mud stuck on socks, etc. The present inventors have made intensive studies on the detergent compositions to solve the problem mentioned before and, as a result, found that a detergency against muddy dirt can be remarkably improved by using both certain N-alkylamino sulfonate type-surfactant and nonionic surfactant as ingredients of a detergent composition. The present invention was accomplished based on the above findings. Accordingly, the present invention provides for a detergent composition comprising (a) a nonionic surfactant selected from the group consisting of polyoxyethylene alkylether, polyoxyethylene alkyphenyl ether and alkyl glycoside and (b) N-alkylamino sulfonic acid type surfactant having the formula (I). wherein R₁ represents C₆-C₁₈ alkyl, alkenyl or hydroxyalkyl, R₂ represents hydrogen, C₁-C₁₈ alkyl, alkenyl, hydroxyalkyl or -(CH₂CH₂0) n -H group (n is an integer of from 1 to 10), and M represents alkali metal, alkaline earth metal and a weight ratio of (a) to (b) is in the range of 1/10 to 10/1. Although nonionic surfactants of the (a) component of the invention are not limited specifically, the following compounds are illustrated for purposes of exemplification. (1) Polyoxyethylene alkyl ether having C₁₀-C₂₀ (average) alkyl or alkenyl group, and added with 1-20 moles of ethylene oxide. (2) Polyoxyethylene alkylphenyl ether having C₆-C₁₂ (average) alkyl group, and added with 1-20 moles of ethylene oxide. (3) Alkylglycoside of the formula (II) R'₆(OR'₇) x G y (II) wherein R′₆ represents straight or branched C₈-C₁₈ alkyl, alkenyl or alkylphenyl, R′₇ represents C₂-C₄ alkylene, G represents a radical derived from aldose having from 5 to 6 carbons, X is 0-5 on average, preferably 0-2, y is 1-10 average, preferably 1.1-3. Aldose having from 5 to 6 carbons includes glucose, fructose, maltose and sucrose. Usually, these nonionic surfactants (a) having HLB of 6-19, preferably 8-17, are used. The amount of the nonionic surfactant (a) in the detergent composition is in the range of 1 to 90 weight percent. Surfactant which can be used as (b) ingredient in the present invention is N-alkylamino sulfonic type surfactant of the formula (I). wherein R₁ represents C₆-C₁₈ alkyl, alkenyl or hydroxyalkyl, R₂ represents hydrogen, C₁-C₁₈ alkyl, alkenyl, hydroxyalkyl or -(CH₂CH₂0) n -H group (n is an integer of from 1 to 10), and M represents alkali metal, alkaline earth metal. Examples of N-alkylamino sulfonic acid type surfactant (b) include (N-laurylamino)-2-hydroxypropane sulfonic acid salt, (N-stearylamino)-2-hydroxypropane sulfonic acid salt, (N-myristylamino)-2-hydroxypropane sulfonic acid salt, (N,N-dioctylamino)-2-hydroxypropane sulfonic acid salt, and (N-palmityl-N-trioxyethyleneamino)-2-hydroxypropane sulfonic acid salt. These compounds can be easily obtained by reacting an amine (R₁R₂NH) with 3-chloro-2-hydroxypropanesulphonic acid in the presence of alkali, and electrolytically dialyse the reaction product to get acid product (Japanese Laid-Open No. 63-69990). In order to enhance the detergency effect aimed by the present invention, it is important to use (a) and (b) ingredient with the weight ratio of (a) to (b) in the range between 10/1 and 1/10, preferably between 10/1 - 1/5. If the weight ratio is more than 10/1, improvement of detergency against the inorganic dirt is nct sufficient. On the other hand, if the weight ratio is less than 1/10, detergency against the sebaceous dirt decreases. A detergency against other inorganic dirt such as carbon black can be enhanced by incorporating an anionic surfactant as an ingredient (C) into the detergent composition of the present invention. Preferable anionic surfactants (c) are illustrated below. (1) Straight or branched alkylbenzene sulfonate having C₁₀-C₁₆ (average) alkyl group. (2) Alkyl or alkenyl ether sulfate having straight or branched C₁₀-C₂₀ (average) alkyl or alkenyl group, and added with 0.5-8 moles (average) of ethylene oxide, propylene oxide, butylene oxide, ethylene oxide/propylene oxide (ratio = 0.1/9.9 - 9.9/0.1) or ethylene oxide/butylene oxide (ratio = 0.1/9.9 - 9.9/0.1). (3) Alkyl or alkenyl sulfate having C₁₀-C₂₀ (average) alkyl or alkenyl group. (4) Olefin sulfonate having C₁₀-C₂₀ (average). (5) Alkane sulfonate having C₁₀-C₂₀ (average). (6) α-sulfo fatty acid salt or ester salt of the following formula: wherein Y represents C₁-C₃ alkyl or counter ion, and Z is counter ion. R represents C₁₀-C₂₀ (average) alkyl or alkenyl group. Examples of counter ion include alkali metal, alkaline earth metal and alkanolamine. Among these, anionic surfactants of groups (1), (2), (4) and (5) are especially preferably. It is preferable to use anionic surfactant (c) in an amount in which the weight ratio [(b) + (c)]/(a) is in the range of 1/10 - 10/1 and the weight ratio (b)/(c) is 1/20 or more. Various components other than (a), (b) and (c) can be incorporated into the present detergent composition unless the component impedes the performance of the invention so as to make the composition aqueous fluid, non-aqueous fluid, paste, powder or bar detergent. Components which can be incorporated are illustrated below. (1) Hydrotrope Ethanol, ethylene glycol, propylene glycol, propanol, lower alkyl benzene sulfonate such as p-toluene sulfonate, benzoic acid, urea, etc. (2) Chelating agent Zeolite, citric acid salt, citrate, ethylenediamine tetracetate, nitro triacetate, layered silicate, tripolyphosphate, etc. (3) Alkali agent Sodium carbonate, potassium carbonate, sodium silicate, alkanol amine, etc. (4) Filler Water, sodium sulfate, etc. (5) Enzyme Amilase, protease, cellulose, lipase, etc. (6) Dispersing Agent Acrylic acid polymer, maleic acid polymer, polyethylene glycol, carboxymethyl cellulose, etc. (7) Bleaching Agent Sodium percarbonate, sodium perborate, etc. (8) Others Fluorescence dye, perfume, colorant, preservative, etc. The present invention is described in detail by way of the following examples. The present invention, however, is not limited to these examples. EXAMPLE 1 Various detergent compositions shown in Table 1 were prepared, and were respectively evaluated with respect to their detergency by the method described below. Cloth soiled with mud (artificially soiled cloth) Kanuma Akadama soils for horticulture use was dried at 120°C ± 5°C for 4 hours and pulverized. After passed through 150 mesh (100 µm) sieve and dried at 120°C ± 5°C for 2 hours, 150 g of the soil was dispersed in 1 l of perchloroethylene After muslin #2023 cloth (standard) was dipped in the perchloroethylene solutions, the cloth was brushed to remove the solution and excess dirt attached (refer to Japanese Laid-Open No. 55-26473). Cloth soiled with sebum and carbon (artificially soiled cloth) Model compositions of sebum and carbon dirt Carbon Black 15% Cottonseed Oil 60% Cholesterol 5% Oleic Acid 5% Palmitic Acid 5% Liquid Paraffin 10% One kg of the above composition was dispersed in 80 l of perchloroethylene. Muslin #2023 cloth was dipped in the perchloroethylene solution to be soiled, and was dried to remove perchloroethylene. Washing condition and evaluation method Five pieces of cotton cloth (10 cm x 10 cm) soiled with mud or sebum/carbon were respectively put into 1 l detergent aqueous solution, and then washed in a Terg-O-Tometer at 100 RPM. Washing condition is as follows: Washing Condition Washing Hours 10 minutes Concentration of Detergent 0.133 % Hardness of Water 4° Water Temperature 20°C Rinse 5 minutes with city water Reflective (light) coefficients of an original cloth before being articially soiled, a soiled cloth before washing and a soiled cloth after washing were measured by self-recording colorimeter (manufactured by Shimazu Ltd.) at 460 µm. Detergency was evaluated by means of detergency coefficient calculated by the following formula. The results are shown in Table 1

Claims: A detergent composition which comprises (a) and (b), and weight ratio of (a) to (b) is in the range of 1/10 to 10/1, (a) a nonionic surfactant selected from the group consisting of polyoxyethylene alkylether, polyoxyethylene alkylphenyl ether and alkyl glycoside (b) an N-alkylamino sulfonic acid type surfactant having the formula (I) wherein R₁ is C₆-C₁₈ alkyl, alkenyl or hydroxyalkyl, R₂ is hydrogen, C₁-C₁₈ alkyl, alkenyl, hydroxyalkyl or -(CH₂CH₂0) n -H group (n is an integer of from 1 to 10), and M is alkali metal or alkaline earth metal. The composition of Claim 1, which further comprises (c) anionic surfactant, and the weight ratio [(b) + (c)]/(a) is in the range of 1/10 - 10/1 and the weight ratio (b)/(c) is 1/20 or more. The composition of Claim 2, wherein said (c) anionic surfactant is one or more selected from the group consisting of alkylbenzene sulfonate, polyoxyethylene alkylether sulfate, olefin sulfonate and alkane sulfonate.

Inventors: SAI FUMIO, TAGATA SHUJI, SAI, FUMIO, TAGATA, SHUJI
Applicants: KAO CORP, KAO CORPORATION
Application year: 1990
Main classification: C11D1
IPC codes: C11D1