Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – Specific organic component
Reexamination Certificate
2000-12-01
2002-06-18
Delcotto, Gregory (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
Specific organic component
C510S336000, C510S341000, C510S342000, C510S350000, C510S352000, C510S499000, C510S501000
Reexamination Certificate
active
06407054
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a surfactant composition for detergents having an excellent detergency to an oily stain and an abundant foamability. It has its excellent foamability, thickening property, water solubility and stability.
PRIOR ART
Not only a high detergency but also an abundant foaming are requested to a detergent such as a shampoo, a rinse, a solid soap, a body shampoo, a detergent for kitchens, a detergent for clothing and a detergent for dwellings. One which has been widely used as a main base in many products is an anionic surfactant such as an alkyl benzenesulfonate, an alkyl sulfate salt, a polyoxyethylene alkyl sulfate salt and an alkyl phosphate salt. However, although any thereof usually shows its excellent detergency and foaming, there is a problem therein that, when solids, a stain derived from silicone or the like is present, the detergency and foamability significantly lower.
In order to improve such a lowering in detergency and/or foamability, various co-surfactants besides the main base have been investigated. There have been first proposed a fatty acid diethanolamide which has been actually and widely used in the products and then proposed in recent years a fatty acid monoethanolamide (WO 98/00507, WO 97/44434, JP-A 11-80785, etc.), a nonionic surfactant based on a sugar amide (WO 94/12610), an acylated sarcosine (WO 96/06596), etc.
However, although these detergent compositions are improved in detergency and foamability, they are not well satisfactory yet. Moreover, since the detergents described above directly contact with the skin daily, they are demanded to exhibit a high performance at a weakly acidic pH region which is mild to the skin. However, in the conventional surfactant system, there has been mentioned such a problem that, even when the foaming is good in from neutral to basic regions, foaming does not take place at all in an acidic region.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a surfactant composition which has its high detergency and foamability within a broad pH region even in the presence of solids. It has its excellent foamability, thickening property, water solubility and stability even under the above-mentioned condition. It is useful as a detergent.
The present invention is a surfactant composition comprising a component (a) represented by the following formula (I) and at least one component (b) represented by the formulae (II) and (III), in the total amount of 0.1to 80% by weight, at the ratio of (a)/(b) by weight of from 99.9/0.1 to 70/30.
In the formula (I), R
1
CO— is a saturated or unsaturated acyl which has 6 to 24 carbon atoms and which may have a hydroxy group; is R
2
is a linear or branched alkyl group having 1 to 3 carbon atoms; and R
3
is a linear or branched alkylene group having 1 to carbon atoms or alkenylene group having 2 to 6 carbon atoms.
In the formulae (II) and (III), R
1
CO—, R
2
and R
3
have the same meanings as above and R
4
CO— is a saturated or unsaturated acyl group which has 6 to 24 carbon atoms and which may have a hydroxy group.
The composition preferably comprises a surfactant other than the above-mentioned components (a) and (b).
It is also preferable that the ratio of the component (a) to the component (b), namely (a)/(b), by weight is from 99.99/0.01 to 80/20.
It is, further, preferable that the blending ratios of the compounds (I), (III) and (II) to their total amount are 80 to 99.99% by weight of the compound (I), 0.01 to 20% by weight of the compound (III) and 0 to 5% by weight of the compound (II).
The ratio of the blending amount of the components (a) and (b) in total to the blending amount of the surfactant other than the components (a) and (b) may be from 0.5/99.5 to 50/50 by weight.
The composition of the present invention may comprises glycerol as an essential component in an amount of 20% by weight or less as compared with the sum of the total amount of the components (a) and (b) and the amount of the surfactant other than the components (a) and (b).
The composition may comprise glycerol as an essential component in an amount of 20% by weight or less as compared with the sum of the total amount of the components (a) and (b) and the amount of the surfactant other than the components (a) and (b), provided that the ratio of the blending amount of the components (a) and (b) and glycerol in total to the blending amount of the surfactant other than the components (a) and (b) is from 0.5/99.5 to 50/50 by weight.
DETAILED DESCRIPTION OF THE INVENTION
In the component (a) of the present invention, R
1
CO— is an acyl group as mentioned above. A saturated or unsaturated acyl group having 8 to 18 carbon atoms is preferable. Among such an acyl group, one containing not less than 50% by weight of a fatty acid residue having 12 to 14 carbon atoms is preferable. Further, one in which a fatty acid residue having 12 carbon atoms is from not less than 40% by weight to less than 100% by weight is more preferable. Specific examples include acyl groups derived from octanoic acid, decanoic acid, dodecanoic acid, tetradecanoic acid, hexadecanoic acid, octadecanoic acid, docosanoic acid, linoleic acid, 2-ethylhexanoic acid, 2-octylundecanoic acid, isostearic acid, oleic acid, a coconut-fatty acid, a palm oil-fatty acid, a palm kernel oil-fatty acid, a beef tallow-fatty acid, etc. There are particularly preferable acyl groups derived from octanoic acid, decanoic acid, dodecanoic acid, tetradecanoic acid, hexadecanoic acid, octadecanoic acid, oleic acid, the coco-fatty acid, the palm oil-fatty acid, the palm kernel oil-fatty acid and the beef tallow-fatty acid.
In order not to lower the foamability, R
2
is a linear or branched alkyl group having 1 to 3 carbon atoms, preferably methyl group or ethyl group and particularly preferably methyl group. In addition, in order not to lower the surface-active performance, R
3
is a linear or branched alkylene or alkenylene group having 1 to 6 carbon atoms and preferably a linear or branched alkylene group having 2 or 3 carbon atoms.
Specific examples of the component (a), for instance, include N-(2-hydroxyethyl)-N-methyl octanamide, N-(2-hydroxyethyl)-N-methyl decanamide, N-(2-hydroxyethyl)-N-methyl dodecanamide, N-(2-hydroxyethyl)-N-methyl tertadecanamide, N-(2-hydroxyethyl)-N-methyl hexadecanamide, N-(2-hydroxyethyl)-N-methyl octadecanamide, N-(2-hydroxyethyl)-N-methyl-coco-fatty carboxamide, N-(2-hydroxyethyl)-N-methyl-palm kernel oil-fatty carboxamide, N-ethyl-N-(2-hydroxypropyl)dodecanamide, N-ethyl-N-(2-hydroxypropyl)oleamide and N-ethyl-N-(2-hydroxypropyl)isostearamide.
A method for producing the component (a) is not particularly limited. For example, it can be produced by a condensation reaction of a fatty acid or a fatty acid lower alcohol ester with an alkanolamine, by a reaction of a fatty acid halide with an alkanolamine in the presence of an alkaline catalyst, by an aminolysis of esters and an alkanolamine, or by the like. The product obtained by such a method often contains small amount of a fatty acid, an inorganic salt, glycerol and the like, but they does not affect the performances at all.
The component (b) is selected from the compounds represented by the above-mentioned formulae (II) and (III). However, it is not necessary to be single and two or more members may be mixed therein. R
1
CO—, R
2
and R
3
in the formulae (II) and (III) have the same meanings as those in the formula (I). In each of the compounds, R
1
, R
2
and R
3
may be same as or different from each other.
R
4
CO— is a saturated or unsaturated acyl group which has 6 to 24 carbon atoms, preferably 8 to 18 carbon atoms, and which may have a hydroxy group. R
1
CO— and R
4
CO— may be the same or different. Specific examples and preferable ones for R
4
CO— include those mentioned hereinabove for R
1
CO—.
Specific examples of the compound represented by the formula (II), for instance, include 2-(methylamino)ethyl octanoate, 2-(methylamino)ethyl decanoate, 2-(methylamino)-ethyl dodecanoate, 2-(methylamino)ethyl
Fujiu Akira
Kubo Makoto
Sakai Takaya
Tetsu Makio
Delcotto Gregory
Kao Corporation
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