JPH08188794A - Detergent composition - Google Patents

Abstract

PURPOSE: To provide the subject composition, containing a primary alkyl sulfate having a specific branched alkyl and an alkyl sulfate containing a straight-chain alkyl, good in biodegradability and excellent in hard water resistance and detergency for oily foulings. CONSTITUTION: This composition contains (A) a primary alkyl sulfate having a Guerbet type alkyl group (a β-branched alkyl) derived from an unbranched alkyl raw material and (B) an alkyl sulfate having a straight-chain alkyl group at (3/7) to (9/1), preferably (4/6) to (8/2) weight ratio of the components (A)/(B). A compound of the formula (R<1> and R<2> are each a 4-12C unbranched saturated alkyl, with the proviso that the total number of carbon atoms in R<1> and R<2> is 10-18; M is a counter ion) is preferred as the component (A) and a primary alkyl sulfate of the formula, R<3> OSO3 M (R<3> is an 8-18C primary alkyl; M is a counter ion capable of providing a soluble salt such as K<+> ) is preferred as the component (B). Furthermore, 30-40wt.% total amount of the components (A) and (B) is preferably blended in the composition.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a detergent composition. More specifically, a cleaning containing a Guerbet type primary alkylsulfate derived from an unbranched alkyl raw material and an alkylsulfate having a straight-chain alkyl group, which exhibits an excellent cleaning effect particularly on oily stains. Agent composition.

[0002]

BACKGROUND OF THE INVENTION Linear alkylbenzene sulfonate (LAS) is still one of the main active ingredients in laundry detergents and still has high detergency,
Although widely used from the economical point of view, in recent years, from the viewpoint of biodegradability under anaerobic conditions and the like, in recent years, a surfactant having a higher degradability and a higher environmental safety has been used.

Alkyl sulphate (AS) is known as one of such surfactants, but since AS has poorer hard water resistance than LAS, various ideas have to be devised for incorporation into detergents. Will be needed. In addition, the branched type AS derived from synthetic alcohol and the mixture thereof are slightly advantageous in terms of hard water resistance as compared with the straight-chain alkyl AS, but the detergency of LAS especially under low temperature washing conditions such as Japan, Especially, it is difficult to reach the detergency for oily dirt. As is more well known, increasing branch points in alkyl,
The presence of multiple branch points is not preferable in terms of biodegradability.

Therefore, an object of the present invention is to provide a detergent composition which is excellent in biodegradability, has little influence on the environment, is excellent in hard water resistance, and is particularly excellent in detergency against oily stains, and alkylsulfuric acid. The purpose is to improve the detergency of oil-based stains of a salt-based detergent.

[0005]

As a result of intensive studies to solve these problems, the present inventors have found that AS having a specific branched alkyl group and AS having a straight-chain alkyl group.
It was found that a detergent composition containing and can effectively remove oily stains, and completed the present invention.

That is, the present invention relates to (A) a primary alkyl sulfate having a Guerbet type alkyl group (β-branched alkyl) derived from an unbranched alkyl raw material (hereinafter referred to as G-AS).
And (B) an alkylsulfate having a linear alkyl group (hereinafter abbreviated as L-AS) are (A) / (B)
= 3/7 to 9/1 in weight ratio. In addition, "unbranched alkyl raw material" means here that the compound containing a linear alkyl group is used as a raw material.

The G-AS used in the present invention is obtained by subjecting a primary Guerbet alcohol obtained by subjecting a linear primary alcohol to a Guerbet condensation (dimerization) in the presence of a KOH / ZnO catalyst by a known method, for example, a continuous method. It is synthesized by performing sulfation with diluted SO ₃ gas in a thin film type sulfation reactor and neutralizing the reaction product in an alkaline aqueous solution such as NaOH. The G-AS of the present invention is characterized in that it has only one branch point in the alkyl group and that the branch position is specified (branching at the β-position). Conventionally, such G-AS has not been blended in a detergent composition.

The G-AS used in the present invention is preferably a compound represented by the following general formula.

[0009]

Embedded image

[Wherein, R ¹ and R ² are unbranched saturated alkyl groups, the total number of carbon atoms of R ¹ + R ² is 10 to 18, and the number of carbon atoms of R ¹ and R ² is 4 to 12 respectively. And M is a counterion that gives a soluble salt of Na ⁺ , K ^{+ and the} like. ] In particular, in the above general formula, the total number of carbon atoms of R ¹ + R ² is 12
~ 16 and the number of carbon atoms of R ¹ and R ² is 6 to 10 respectively.
Compounds that are even in the range are preferred.

Further, according to the present invention, G-AS and L as described above are used.
-AS is blended in a specific ratio. For L-AS, the formula
R ³ OSO ₃ M [In the formula, R ³ is a primary alkyl group having 8 to 18 carbon atoms, and M is a counter ion which gives a soluble salt of Na ⁺ , K ^{+ and the} like. ] The primary alkyl sulfate represented by

In the present invention, (A) G-AS and (B) L-
AS is (A) / (B) = 3/7 to 9/1, preferably 7 /
It is blended in a weight ratio of 13 to 17/3, and more preferably 4/6 to 8/2. If the amount is out of this range, the effect on oily stains becomes worse. The total amount of G-AS and L-AS is 0.5 to 60% by weight, preferably 10 to 50% by weight, more preferably 30 to 40% by weight in the composition. Further, it is desirable that G-AS accounts for 30% by weight or more, preferably 40% by weight or more, and more preferably 50% by weight or more, based on the total amount of the surfactants incorporated in the composition.

The detergent composition of the present invention may contain a surfactant other than the above G-AS and L-AS within a range not impairing the effects of the present invention. The surfactant may be one generally used in detergents, and examples thereof include anionic surfactants, nonionic surfactants, amphoteric surfactants, and cationic surfactants.

As the anionic surfactant, any one can be used as long as it is usually blended with a detergent, and it is not limited. Specifically, as the anionic surfactant, an alkylbenzene sulfonate having an alkyl chain having 8 to 22 carbon atoms, alkyl or alkenyl ether sulfate, alkyl or alkenyl sulfate, α-olefin sulfonate, α-sulfofatty acid Salt or ester salt, alkane sulfonate, saturated or unsaturated fatty acid salt, alkyl or alkenyl ether carboxylate, amino acid type surfactant,
Examples thereof include N-acyl amino acid type surfactants, alkyl or alkenyl phosphate esters or salts thereof.

As the nonionic surfactant, a polyoxyalkylene alkyl (or alkenyl) ether, a polyoxyethylene alkylphenyl ether, a higher fatty acid alkanolamide or a alkylene oxide addition thereof having a hydrophobic group having a hydrocarbon group having 8 to 22 carbon atoms is added. Compounds, sucrose fatty acid ester, alkyl glucoside, fatty acid glycerin monoester, alkyl amine oxide and the like. The following nonionic surfactants are particularly preferable. (1) A polyoxyethylene alkyl ether having an alkyl group having an average carbon number of 10 to 20 and having 1 to 30 mol of ethylene oxide added thereto. (2) An alkyl phenyl ether having an alkyl group having an average carbon number of 9 to 12 and having 1 to 25 mol of ethylene oxide added thereto. (3) An alkyl glycoside represented by the following general formula. R (OC ₂ H ₄ ) _{xG y} (wherein R is an alkyl group having 9 to 14 carbon atoms, X is a number from 0 to 2, G is a glucose, fructose, maltose or sucrose residue, and y is 1 to 4). , And preferably 1 to 2 to 3.) In addition to the surfactant, a builder is compounded within a range that does not impair the oily soil detergency by the synergistic action of the components (A) and (B). be able to. Examples of builders include carbonates such as soda ash, sulfates, sulfites, silicates, and Japanese Patent Publication No.
No. 41116, other crystalline layered silicates, aluminosilicates such as zeolites A, X and P type, tripolyphosphates,
Inorganic builders such as pyrophosphate and orthophosphate, polyacrylates, polymaleates, salts of copolymers of acrylic acid and maleic acid, polyglyoxylates and citric acid described in JP-A-54-52196. Organic builders such as salts, oxydisuccinates, nitrilotriacetic acid salts and the like can be mentioned. Further, an organic chelating agent such as EDTA can be added. In addition, an enzyme may be added, and specific examples thereof include protease, cellulase, amylase, lipase and the like. Other trace ingredients include usual fragrances, foam suppressors such as silica and silicone, biphenyl type optical brighteners or stilbene type optical brighteners or fluorescent whitening agents using them in combination, anti-caking agents, rinse aids. Agents can be added.

A bleaching agent composition can be added to the detergent composition of the present invention. The bleach composition is composed of sodium percarbonate, sodium perborate, preferably sodium percarbonate and various bleach activators.

The detergent composition of the present invention is a powder or granular composition, but the production method is not particularly limited, and conventionally known methods can be used. In particular,
Water content of each component is 30-80% by weight, preferably 35-60% by weight
It is desirable to granulate the spray-dried particles obtained by spray-drying the aqueous slurry of, and preferably the spray-dried particles to have a high bulk density. Alternatively, a method may be used in which an unneutralized product is directly neutralized and mixed with an alkali agent such as an alkali metal hydroxide, kneaded with other washing builders, and then cooled and pulverized after mixing. . High bulk density is disclosed in JP-A-61-6989
No. 7, JP-A-61-69899, JP-A-61-69900
The method described in Japanese Patent Publication No. 513824A and European Patent No. 513824A can be used. Regarding direct neutralization, JP-A-60-7299
No. 9 publication can be referred to. Further, the obtained detergent particles are preferably coated with a water-insoluble substance such as zeolite.

The average particle size of the detergent composition of the present invention is preferably 200 to 1000 μm in order to obtain preferable powder properties. The bulk density of the cleaning composition of the present invention is 0.
The amount is 5 to 1.0 g / cm ³ , preferably about 0.6 to 0.9 g / cm ³ .

[0019]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

Examples 1 to 9 and Comparative Examples 1 to 6 Using the detergent compositions having the compositions shown in Tables 2 and 3, the cleaning power against each oil stain was evaluated by the following method.
The results are shown in Tables 2 and 3. In addition, in G-AS-Na used in Tables 2 and 3, R ¹ and R ² in the general formula (I) are
It is composed of a C ₆ alkyl group and a C ₈ alkyl group, and the total carbon number of R ¹ and R ² is 14.

<Evaluation method of oil stain detergency> 1. Preparation of artificial soil cloth 75 liters of ethylene tetrachloride with 1531.2 g of organic soil consisting of the components shown in Table 1, and also from the components shown in Table 1 240g of carbon paste is added and ultrasonically dispersed for 10 minutes. In this bath, clean cloth with a width of 10 cm [polyester /
Dip a cotton (65/35 weight ratio) mixed-spun cloth plain weave undyed cloth], and after air pollution, air-dry to make a dirty cloth. This contaminated cloth was cut into 10 × 10 cm, the reflectance was measured with 300A manufactured by NIPPON DENSHOKU, and the one having a reflectance within the range of 30 ± 1% was subjected to the cleaning test. In addition,
The weight% in Table 1 is the ratio in the mixture of organic dirt and carbon paste.

[0022]

[Table 1]

2. Washing method A washing test was carried out using a Terg-O-Tometer manufactured by Kamijima Seisakusho Co., Ltd.
Using 1 liter of an aqueous detergent solution obtained by adding a detergent having the composition shown in Tables 2 and 3 to tap water at 20 rpm and 20 ° C. and 4 ° DH under conditions such that the detergent concentration is 0.0833% by weight. Washed for 10 minutes.

3. Evaluation Method The reflectance of the soiled cloth after washing (λ = 550 μm) was measured, and the washing rate was calculated by the following formula.

[0025]

[Equation 1]

[0026]

[Table 2]

[0027]

[Table 3]

Claims (6)

[Claims] 1. A primary alkyl sulfate having (A) a Guerbet type alkyl group (β-branched alkyl) derived from an unbranched alkyl raw material and (B) an alkyl sulfate having a linear alkyl group, A) / (B) = cleaning agent composition contained in a weight ratio of 3/7 to 9/1. 2. The total of the component (A) and the component (B)
The cleaning composition according to claim 1, containing 0.5 to 60% by weight. 3. The cleaning composition according to claim 1, wherein the component (A) is a compound represented by the following general formula. Embedded image [Wherein R ¹ and R ² are unbranched saturated alkyl groups, and R ¹ +
The total number of carbon atoms in R ² is 10 to 18, the number of carbon atoms in R ¹ and R ² is 4 to 12, respectively, and M is a counterion. ] 4. In the above general formula, the total number of carbon atoms of R ¹ + R ² is 12 to 16 and the number of carbon atoms of R ¹ and R ² is an even number in the range of 6 to 10, respectively. The cleaning composition according to item 3. 5. The component (A) accounts for 30% by weight or more of the total amount of the surfactant incorporated in the composition.
The cleaning composition according to any one of 1. 6. The component (B) is R ³ OSO ₃ M [wherein, R ³ is a primary alkyl group having 8 to 18 carbon atoms, and M is a counter ion. ] It is a primary alkyl sulfate represented by these, The cleaning composition of any one of Claims 1-5 characterized by the above-mentioned.