Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2002-05-07
2004-08-10
Del Cotto, Gregory R. (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S127000, C510S130000, C510S136000, C510S137000, C510S138000, C510S158000, C510S159000, C510S237000, C510S502000
Reexamination Certificate
active
06774095
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a detergent composition such as detergent for shampoo, detergent for body wash, detergent for face wash, detergent for hand wash, and detergent for dish wash.
BACKGROUND ART
Heretofore, detergents for shampoo, detergents for body wash, and the like, which were to be washed away after being applied to skin or hair, were mostly composed of detergent bases such as salts of alkyl sulfate, salts of polyoxyalkylene alkyl ether sulfate, etc. However, since the use of such detergent bases alone leads to poor foaming, an amide such as a monoethanolamide or a diethanolamide is also used in order to enhance the foaming property of the detergent.
However, a monoethanolamide is a solid at normal temperature and therefore it presents a handling problem at the time of manufacture. In addition, it presents another problem such as deposition of crystals when stored at a low temperature. On the other hand, a diethanolamide is associated with concern over the possibility of the formation of nitrosamine.
Generally, it is known that the optimum pH values of foaming agents vary depending on the combinations with surfactants.
There is a description that lauroyl N-methylmonoethanolamide is effective as a foam booster for a salt of alkyl sulfate in JAOCS 48(11), 674-677(1971). However, no description is made of skin irritation, pH, and storage stability.
U.S. Pat. No. 4,070,309 describes a composition which has a pH value of 7 to 10 and comprises an anionic surfactant, a nonionic foam booster, and an alkylphenol derivative, wherein myristoyl N-methylmonoethanolamide is an example of the nonionic foam booster. However, this technique cannot improve both of foamability and storage stability at the same time.
Japanese Patent Application Laid-Open (JP-A) No.10-330783 discloses in examples thereof a combination of an amide sulfate ester-based surfactant and coconut oil fatty acid N-methylethanolamide. However, this technique merely discloses effects based on the detergency and foamability of the amide sulfate ester-based surfactant as the main detergent base and the addition of a small amount of coconut oil acid N-methylethanolamide. Accordingly, no mention whatsoever is made of obtaining a detergent composition which causes little skin irritation and ample foaming.
DISCLOSURE OF THE INVENTION
The object of the present invention is to make it possible to produce, with ease in handling, a detergent composition which has low skin irritation, good foamability and excellent stability when stored as a product.
The present inventors found that an amide alcohol having a specific structure exhibits an excellent foamability in a weakly acidic range, which is said to has low skin irritation, and improves stability when stored as a product.
The present invention relates to a detergent composition comprising 0.8 to 20 weight % of (A) an amide alcohol represented by the following general formula (1) [hereinafter referred to as component (A)] and (B) at least one surfactant selected from an anionic surfactant, a nonionic surfactant, and an amphoteric surfactant [hereinafter referred to as component (B)], wherein the pH at 25° C. of the 20-fold diluted aqueous solution of the detergent composition is 4.5 to 6.8.
In the formula (I), R
1
CO— is a saturated or unsaturated acyl group which has 6 to 24 carbon atoms and may have a hydroxy group; R
2
is a linear or branched alkyl group having 1 to 3 carbon atoms; and R3 is a linear or branched alkylene group having 1 to 6 carbon atoms or alkenylene group having 2 to 6 carbon atoms.
The detergent composition of the present invention can be produced with ease in handling. The detergent composition has good foamability at the time of washing, excellent stability when stored as a product and low skin irritation. Therefore, the detergent composition is most suitable for such uses as detergent for shampoo, detergent for body wash, detergent for face wash, detergent for hand wash, etc.
The composition of the present invention may further contain at least one selected from (C) an antimicrobial agent, (D) a conditioning component, (E) a pearling agent, and (F) a plant extract.
If the composition contains (C) an antimicrobial agent, the composition exhibits a high antimicrobial effect. If the composition contains (D) a conditioning component, the composition provides a comfortable feeling after use and a sufficient conditioning effect to the skin or hair. If the composition contains (E) a pearling agent, the composition provides a good appearance. If the composition contains (F) a plant extract, the composition provides effects, such as a moisturizing effect, an anti-inflammatory effect, and the like, which are characteristic of the extract, while maintaining good stability of the composition.
DETAILED EXPLANATION OF THE INVENTION
In the general formula (1) for the component (A), R
1
CO— is preferably a saturated or unsaturated acyl group having 8 to 18 carbon atoms. Preferably, the R
1
CO— groups are acyl groups derived, for example, from octanoic acid, decanoic acid, dodecanoic acid, tetradecanoic acid, hexadecanoic acid, octadecanoic acid, docosanoic acid, linoleic acid, isostearic acid, oleic acid, coconut oil fatty acid, palm oil fatty acid, palm kernel oil fatty acid, etc. Particularly preferably, the R
1
CO— groups are acyl groups derived from decanoic acid, dodecanoic acid, coconut oil fatty acid, palm oil fatty acid, and palm kernel oil fatty acid, etc. R
2
is preferably a methyl group and R
3
is preferably an ethylene group.
From the viewpoint of the foamability of the detergent base and the stability when stored as a product, the component (A) is incorporated in a proportion of 0.8 to 20 weight %, preferably 1 to 10 weight %, and more preferably 1 to 5 weight % into the detergent composition of the present invention.
The anionic surfactant, nonionic surfactant, and amphoteric surfactant as the component (B) are selected from those generally used for cosmetics and toiletries, etc.
Examples of the anionic surfactant include salts of alkyl sulfate, salts of polyoxyalkylene alkyl ether sulfate, salts of polyoxyalkylene alkyl ether acetic acid, salts of polyoxyalkylene alkyl ether phosphate, salts of alkyl phosphate, salts of N-acylmethyltaurine, salts of acylglutamic acid, salts of acyloyl-&bgr;-alanine, salts of alkylsulfosuccinic acid, salts of polyoxyalkylene alkylsulfosuccinic acid, fatty acid salts, etc. In particular, salts of alkyl sulfate, salts of polyoxyalkylene alkyl ether sulfate, salts of polyoxyalkylene alkyl ether acetic acid, salts of polyoxyalkylene alkyl ether phosphate, and salts of alkyl phosphate are preferable. Further, salts of alkyl sulfate and salts of polyoxyalkylene alkyl ether sulfate are preferable from the viewpoint of higher foamability. These anionic surfactants may be used singly or in a combination of two or more. Particularly preferred an ionic surfactants are those represented by the following general formula (2).
R
4
—O—(CH
2
CH
2
O)
n
—SO
3
M
wherein R
4
represents a saturated or unsaturated hydrocarbon group having 10 to 18 carbon atoms; n represent a number in the range of 0 to 5; and M represents an alkali metal, an alkaline earth metal, ammonium, an alkanolamine, or a basic amino acid.
In the general formula (2), n is the average of the numbers of moles of ethylene oxide added (hereinafter indicated as EOp) and is preferably 0 to 3 from the viewpoint of foamability. More preferably, n is 1 to 3 because of lower skin irritation. Further, it is preferable that the proportion of the anionic surfactant represented by the general formula (2) is 60 to 100 weight % of the total anionic surfactants.
Examples of the nonionic surfactant include alkyl polyglycosides, polyoxyalkylene (preferably ethylene) alkyl or alkenyl ether, polyoxyalkylenesorbitan fatty acid esters, sorbitan fatty acid esters, polyoxyalkylenesorbitol fatty acid esters, polyoxyalkyleneglycerin fatty acid esters, polyglycerin fatty acid esters, fatty acid monoglycerides, polyethyleneglycol fatty acid
Hasebe Keiko
Kubo Makoto
Matsumoto Chikako
Sakai Takaya
Del Cotto Gregory R.
Kao Corporation
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