JPS592320B2 - Liquid cleaning composition without film formation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a liquid detergent containing an alkyl ethoxy sulfate salt as an active ingredient, and the object thereof is to form a film even when left in the atmosphere. Our goal is to provide a liquid cleaning agent that never fails.

Various anionic activators are used as active ingredients in liquid detergents.

Among such anionic activators, alkali metal salts or alkaline earth metal salts of alkyl ethoxy sulfate esters have better cleaning performance than other anionic activators, and they do not cause color deterioration like alkanolamine salts. It has the feature that there is no However, among liquid cleaning agents in which the total active agent component is 15 to 70% by weight, liquid cleaning agents containing 5% by weight or more of alkali metal salts or alkaline earth metal salts of alkyl ethoxy sulfuric esters are It has unique properties that are not found in liquid cleaning agents; when the liquid cleaning agent is left in the atmosphere, a film is formed on the surface of the liquid. This kind of film formation occurs when the liquid cleaning agent is collected in a measuring cup or when the lid of the cleaning agent container is forgotten to be closed, so it not only reduces the commercial value of the liquid cleaning agent, but also damages the cleaning agent. Makes quality control during manufacturing difficult. By the way, film formation as described above is a drawback inherent to liquid cleaning agents containing alkali metal salts or alkaline earth metal salts of alkyl ethoxy sulfates; however, conventional research in the industry has focused exclusively on liquid cleaning agents. prevention of gelation,
The aim is to reduce viscosity or improve low-temperature stability, and no means for preventing film formation has been proposed so far.

The present inventors investigated the film formation of a liquid detergent containing an alkali metal salt or an alkaline earth metal salt of an alkyl ethoxy sulfate as an active ingredient in a liquid detergent containing 15 to 70% by weight of the total active agent component. However, if the proportion of the alkali metal salt and/or alkaline earth metal salt of the alkyl ethoxy sulfate in the liquid cleaning agent is 5% by weight or more, the formation of a film that is undesirable as a liquid cleaning agent may occur. It has been found that this film formation can be prevented by blending polyethylene glycol with a water-soluble inorganic chloride. The liquid cleaning agent according to the present invention has the formula RO(C2H4O)nSO3M (where R is a C7 or higher straight chain or branched alkyl group), in which the total active agent component is 15 to 70% by weight. , n is an average number of 1 or more, M is an alkali metal or alkaline earth metal), 5% by weight or more, and 1 to 10% by weight of polyethylene glycol whose average degree of polymerization of ethylene oxide is 9 to 140. The composition is characterized by containing 1 to 10% by weight of water-soluble inorganic chloride.

In the liquid detergent of the present invention, the alkyl ethoxy sulfate ester salt of the formula RO(C2H4O)NSO3M used as the active ingredient has a lower solubility in water as the number of carbon atoms in the alkyl group (R) increases. When the average number of added moles (n) of ethylene oxide increases, the foaming power deteriorates.

Therefore, it is generally preferable to use an alkyl ethoxy sulfate salt in which the number of carbon atoms in the alkyl group is 18 or less and the average number of added moles of ethylene oxide is 5 or less.
Regarding polyethylene glycol, in the present invention, polyethylene glycol with an average degree of polymerization of ethylene oxide of 9 to 140 (average molecular weight of about 400 to 7,600) is used, and if polyethylene glycol outside this range is used, the desired result may not be achieved. You can't expect any results.

However, even with polyethylene glycol within this range, the effect is not exhibited when the blending amount is less than 1% by weight;
If the blending amount exceeds , the foaming power will be poor. As the water-soluble inorganic chloride that works cooperatively with the above-mentioned polyethylene glycol to prevent the liquid cleaning agent from forming a film, sodium chloride, potassium chloride, ammonium chloride, and magnesium chloride are used.

All of these chlorides function as viscosity modifiers in the liquid detergent of the present invention, and also have good low-temperature stability because chlorine ions are stabilized by the ethoxy groups of the alkyl ethoxy sulfate salts. . However, too much chloride in the formulation impairs the low-temperature stability of liquid detergents.
In general, it is possible to mix it in an amount of about 1 to 10% by weight, preferably about 1 to 5% by weight. The liquid detergent of the present invention must contain the above three components, but in addition to these, known active ingredients or additives for liquid detergents may be added to the liquid detergent of the present invention as necessary. be able to.

For example, polyoxyethylene alkyl ethers can be added as active ingredients. The addition of polyoxyethylene alkyl ether improves the detergency and rinsing properties of the liquid detergent according to the invention, as well as improving the viscosity and low temperature stability. However, polyoxyethylene alkyl ether has poor detergency when the alkyl group has less than 7 carbon atoms, and the average number of moles of ethylene oxide added is 4.
If it is less than that, the solubility in water will be significantly reduced. Therefore, when adding polyoxyethylene alkyl ether to the liquid cleaning agent of the present invention, use a polyoxyethylene alkyl ether obtained by adding an average of 4 to 18 moles of ethylene oxide to an alcohol having an average of 7 to 18 carbon atoms. is preferred. A common lower alcohol (having 1 to 3 carbon atoms) can be added to the liquid detergent of the present invention as a viscosity reducing agent and low-temperature stability improver for liquid detergents.

The amount of lower alcohol added is 30% of the total amount of liquid cleaning agent.
Weight % or less is acceptable. Flavors, coloring agents, and the like can be added to the liquid cleaning agent of the present invention as necessary, similar to known liquid cleaning agents. As is clear from the detailed description above, the present invention prevents film formation caused by alkyl ethoxy sulfate salts by using polyethylene glycol and a water-soluble inorganic chloride in combination. is not necessarily clear at present.

However, it is estimated as follows. That is, the film formed on the liquid surface is thought to be because the molecules of the alkyl ethoxy sulfate salt are adsorbed and oriented on the liquid surface to form a layered structure, regardless of the viscosity of the liquid, forming a so-called nit soap. However, since the polyethylene glycol used in the present invention has a molecular length suitable for entering the layered structure, it penetrates into the layered structure and destroys the layered structure with its hydration power. It is surmised that the water-soluble inorganic chloride serves to neutralize the charge of the alkyl ethoxy sulfate salt forming the layered structure and assist in the transition to a spherical micelle structure. Next, the configuration and effects of the present invention will be explained in more detail by showing examples.

For each liquid cleaning agent, the degree of film formation and low temperature stability were evaluated using the following method.

Film Formation: Collect 20 ml of liquid cleaning agent into a 30 ml supple beaker, leave it for 12 hours at 20°C and 70% RH, observe the surface condition of the liquid, and evaluate according to the following table.

Low-temperature stability: Collect the liquid detergent in a test tube, leave it in a thermostat at -5°C for 7 days, observe the liquid properties, and evaluate according to the following table.

Example 1 A cleaning composition was prepared by mixing an alkyl ethoxy sulfate having 12 carbon atoms with various polyhydric alcohols, electrolytes, etc., and the degree of film formation was measured.

The results are shown in Table-1. As shown in Table 1, film formation based on alkyl ethoxy sulfate has a molecular weight of 400 to 7.
This can be prevented by using a combination of polyethylene glycol in the range of 600 and inorganic electrolyte.

Example 2 10 to 50 parts of alkyl ethoxy sulfate having an alkyl group having 12 carbon atoms, alcohol polyoxyethylene ether having an alkyl group having 12 carbon atoms, average number of moles added to ethylene oxide 10) 20 to 50 parts, ethyl alcohol 10 parts , 3 parts of sodium chloride, 5 parts of polyoxyethylene glycol (molecular weight 1000), and a water balance.

Next, film formation and low temperature stability of this composition were measured, and the results are shown in Table 2.

As shown in Table 2, a composition in which polyoxyethylene glycol and inorganic chloride are mixed with a composition in which the alkyl ethoxy sulfate is 5% or more and the total active agent component is 15 to 70% has a tendency to form a film. It also has good low-temperature stability.

Claims (1)

[Claims] 1 In a liquid detergent composition in which the total active agent components are 15-70% by weight, the formula RO(C_2H_4O)nSO_3
M (however, R is a straight chain or branched alkyl group of C_7 or more,
n is an average number of 1 or more, M is an alkali metal or alkaline earth metal, respectively. 1-1
A liquid cleaning composition characterized in that it contains 0% by weight and 1 to 10% by weight of a water-soluble inorganic chloride.