JPH0454720B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to liquid detergent compositions, and more particularly to enzyme-containing liquid detergent compositions that are stabilized against enzyme deactivation. It has been well known that fats, proteins, and enzymes such as digestive enzymes are excellent detergent aids, and various laundry detergent compositions containing these enzymes have been widely used. The most important issue in enzyme-containing detergent compositions is to prevent the enzymes from deactivating during storage. Many proposals have been made for additives. Although these proposals give mostly satisfactory results in the case of granular detergent compositions in which all the ingredients are present in the form of solid particles during storage, it is important that the ingredients are dissolved or suspended in the aqueous medium. In the case of liquid detergent compositions that exist in the form of liquid detergent compositions, satisfactory results have not yet been obtained. Therefore, an object of the present invention is to provide an enzyme-containing liquid detergent composition that is stabilized against enzyme deactivation even during long-term storage and that can stably provide excellent detergency. Another object of the present invention is to provide a liquid detergent composition that has the above-mentioned improvements without impairing its stability as a liquid. According to the present invention, it contains (A) a builder consisting of a combination of a surfactant, triethanolamine and common salt, (B) a solvent and stabilizer consisting of ethanol or a polyhydric alcohol, and (C) a detergent enzyme. and 1 to 50% by weight of surfactant, 0.5 to 10% by weight of triethanolamine, and salt.
1 to 20% by weight of a solvent/stabilizer, 0.01 to about 1% by weight of a detergent enzyme, and the balance of water. things are provided. The present invention provides that when a combination of triethanolamine and common salt (sodium chloride) as a detergent builder and ethanol or polyhydric alcohol as a solvent are blended into a liquid detergent composition containing a surfactant and a detergent enzyme, the liquid detergent composition is improved. This is based on the knowledge that a stable liquid detergent that is stabilized against enzyme deactivation and has significantly improved detergency can be obtained without impairing transparency or dissolution or dispersion stability. Unlike granular detergents, liquid detergent compositions are required to have liquid transparency and solubility and dispersion stability during storage, so they have the special problem of not being able to incorporate a large amount of detergent builder into the composition. be. From this point of view, organic builders such as alkali metal salts of ethylenediaminetetraacetic acid and nitrile triacetate, as well as relatively small amounts of carbonates, phosphates, and sulfates, have conventionally been used as compounds that have relatively large effects as builders when mixed in small amounts. Inorganic builders have been used, but when detergent enzymes are added to liquid detergent compositions containing such builders, the enzymes are deactivated within a relatively short period of time, and the detergency is the same as that immediately after production. In contrast, there is a drawback that the level after storage drops to a significantly lower level. According to the present invention, by using a combination of triethanolamine and common salt as a detergent builder for an enzyme-containing liquid detergent composition, it is possible to obtain enzyme deactivation resistance and increase detergency, and furthermore, By incorporating a solvent/stabilizer such as ethanol, the anti-deactivation stability and detergency can be further improved. In the liquid detergent composition of the present invention, the combination of triethanolamine and common salt used as a builder exists in a stable state dissolved in an aqueous medium together with other ingredients, and acts as a builder while at the same time deactivating enzymes. It is particularly suitable for the purpose of the present invention in that it has the effect of stabilizing it over a long period of time. Further, a solvent/stabilizer such as ethanol also acts to improve the compatibility of various compounded components and also to stabilize the enzyme. In the present invention, the blending ratio of the various components mentioned above can be varied within a fairly wide range, but the surfactant is 1 to 50% by weight, particularly 10 to 40% by weight, triethanolamine is 0.5 to 10% by weight, Especially 3 to 5% by weight, salt 0.1 to 10% by weight, especially 3 to 5% by weight, detergent and stabilizer 1 to 20% by weight,
Particularly good results are obtained with respect to the objects of the invention, especially when amounts of 5 to 10% by weight and the remaining amount of water are used. As the surfactant, any nonionic, anionic or amphoteric surfactant conventionally used in liquid detergents may be used alone or in combination of two or more. Surfactants particularly suitable for the purpose of the present invention are those mainly composed of nonionic surfactants and containing small amounts of anionic and/or amphoteric surfactants. Suitable examples of suitable surfactants include, but are not limited to: That is, any known nonionic surfactant can be used, but higher alcohol surfactants and alkylolamide surfactants are advantageously used. Any known anionic surfactants can be used, including alkyl sulfates, alkylbenzenesulfuneates, α-olefin sulfonates,
Alkali metal salts such as alkyl ethoxy sulfates and amine salts such as triethanolamine salts are advantageously used. As the amphoteric surfactant, a glycine type, betaine type or imidazoline type active agent is used. In the present invention, it is important to use common salt among various inorganic salt builders, and when using sodium carbonate, sodium sesquicarbonate, mirabilite, and various phosphates, the solution stability and loss resistance are The activity stability tends to be lower than that of the present invention. As detergent enzymes, any enzymes known to easily decompose dirt and stains on textiles during washing can be used, including enzymes that are particularly active in alkaline regions, such as proteolytic enzymes. etc. are advantageously used. Ethanol and polyhydric alcohols are used as solvents and stabilizers.
In addition to glycerin, partially etherified glycerin, ethylene glycol, propylene glycol,
Diethylene glycol, triethylene glycol, etc. are used. Suitable examples of partially etherified products of glycerin are mono-methyl, ethyl, propyl, isopropyl, butyl ethers of glycerin and diglycerin. In addition to the above-mentioned essential ingredients, the enzyme-containing liquid detergent composition of the present invention may contain any compounding agents known per se, such as various dyes, fluorescent brighteners, fragrances, and thickeners. It can be blended according to. The invention is illustrated by the following example. Example 1 A liquid detergent composition having the formulation shown in Table 1 below was prepared using Esperase (brown liquid) manufactured by Novo, which is an alkaline protease, and tested for the following items. (1) Characteristics of enzyme activity After the various detergents shown in Table 1 are bottled and sealed, they are left in an atmosphere at a temperature of 37°C, and the enzyme activity after each number of days is measured using the DMS method for detergents containing esperase. The activity of the detergent at the time of preparation is measured at 100
It was calculated as residual activity (%). (2) Cleaning power Washing liquids with a detergent concentration of 0.67 g/W were prepared using the detergent immediately after preparation and the detergent after each number of days in (1) above. Tergo-O-tometer as a cleaning machine
Using protein-contaminated cloth (oleic acid 28.3, squalane 2.5, triolein 15.6, cholesterol 1.6, cholesterol oleate 12.2, gelatin 7.0, Narupara 2.5, Tada carbon 0.2, test dust 11 types 29.8, dirt: 1, Water: 20), rotation speed 100 rpm, cleaning temperature 40℃, cleaning time
Washing was carried out for 10 minutes and the detergency was determined.
The cleaning power is determined by determining the optical reflectance of the cloth before and after cleaning, and using the following formula: cleaning power (%) = Reflectance after cleaning - Reflectance before cleaning / White cloth reflectance - Reflectance before cleaning x 100 The detergency was calculated by (3) Transparency and Stability Test After each type of detergent was left at a low temperature of -15°C for several days, the state of the liquid was observed with the naked eye and expressed using the following evaluation. 5...The liquid is clear and no precipitate is observed even if left standing. 4: The liquid remains slightly opaque even after being left to stand, or a very small amount of precipitate is formed when left to stand. 3...Things that produce a considerable amount of sediment when left unattended. 2...Some opacity or precipitation occurs during the preparation of liquid detergent. 1: A liquid detergent that is already significantly opaque or precipitated during preparation. The results obtained are shown in Tables 2, 3 and 4.

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[Table] * No enzyme added

[Table] From the results in Tables 2, 3, and 4 above, excellent enzyme activity and liquid stability can be obtained by using a combination of alkanolamine and common salt as a builder, and in addition, the combination of alkanolamine and common salt can be obtained by using a combination of alkanolamine and common salt as a builder. It can be seen that these properties are further improved by blending a curing agent/solvent. The Esperase 8.0L (manufactured by Novo) used in this example had a concentration of 8.65KNPU ^x /g (Kilo Novo)
The enzyme activity of proteinase units per gram was used.

Claims (1)

[Claims] 1. (A) a builder consisting of a combination of a surfactant, triethanolamine and common salt, (B) a solvent and stabilizer consisting of ethanol or a polyhydric alcohol, and (C) a detergent enzyme. Contains 1 to 50% by weight of surfactant, 0.5 to 10% by weight of triethanolamine, and salt.
1 to 20% by weight of a solvent/stabilizer, 0.01 to about 1% by weight of a detergent enzyme, and the balance of water. .