JPH0453919B2 - - Google Patents

Description

[Detailed description of the invention]

BACKGROUND OF THE INVENTION This invention relates to improved laundry bars for use in hand washing textiles. Bar laundry soaps used for hand-washing fabrics, unlike powdered laundry soaps or detergents used in washing machines or bowl washes, are designed to retain their integral structure during post-manufacturing handling, transportation and use. It must have good strength. They are popular because they are economical to use, and because bar soaps are rubbed directly onto the surface of textiles, they are suitable for use in hand washing areas where only a small amount of water is used in the washing process. Particularly suitable. Commonly known laundry soap bars, such as those described in GB 2,083,490, typically contain from about 7% to about 45% detergent actives and from about 5% to about 60% detergent builder by weight. materials and a number of optional ingredients such as abrasives, fillers, fragrances, colorants and alkali salts. These are used under cold or lukewarm water conditions. The inclusion of bleach in bar laundry soaps to improve their cleaning performance has been proposed, but without success. German Patent Application No. 1086214 discloses built solid detergents containing sodium perborate. However, this perborate-containing bar soap rapidly degrades during use and storage. Solid laundry soap used for hand washing textile products: 1
Unlike powdered detergents, which are used in one wash cycle, they are intended for repeated use, so when adding bleach to bar laundry soaps, they must be used not only during storage before use, but also during use (i.e., at the beginning and afterward). It is necessary to keep the bleach in bar soap stable (after each use as well as after contact with water). It is an object of the present invention to provide an improved and more effective laundry soap bar containing a stable and effective bleaching agent. It has now been discovered that alkali metal sulfites, particularly sodium sulfite (Na ₂ SO ₃ ), can be incorporated into solid laundry detergent compositions as stable and effective bleaching agents. The use of sodium sulfite as a bleaching agent in dry-built detergent compositions has been described, for example, in US Pat.
Although it is known from the specifications of No. 1315937 and No. 1417840, it cannot be said that the bleaching agent is kept sufficiently stable in this type of known composition. French Patent No. 1 186 901 discloses detergent compositions containing sulfites to reduce discoloration of metals. The improved laundry bar soap of the present invention comprises 15 to 45%, preferably 20 to 45% by weight of anionic detergent actives, 5 to 60% by weight of detergent builder substances and a further 5 to 25% by weight of alkali metal sulfites. , preferably 7.5 to 15% by weight of sodium sulfite;
The detergent builder material contains water-soluble carbonates which produce an alkaline cleaning solution during use of the bar soap. If desired, the bar laundry soap of the present invention may preferably be formulated with a photobleaching compound, such as aluminum phthalocyanine sulfonate (AlPCS). Using said compounds in sunlight further enhances the performance of the soap. This type of photobleaching compound is generally 0.001-1.0% by weight, especially 0.002-1.0% by weight.
It is added in an extremely small amount of about 0.1% by weight. Detergent active ingredients and builder ingredients that can be used in the present invention are those commonly used in the art.
These ingredients are described by Schwarz and Perry as ``Surface Agents''.
Active Agents, Volume 1 (Interscience, 1958). Suitable detergent actives belong to the general category of nonionic actives and can also be used in admixture with nonionic, amphoteric, betaine and zwitterionic actives. Preferred detergent active ingredients consist of straight or branched chain alkyl ( _C8-16 ) benzene sulfonates;
It may be used alone or in combination with other components, preferably in small amounts, with the alkylbenzene sulfonate. Detergent actives that can be used in combination with alkylbenzene sulfonates include alkanesulfonates, alcohol sulfates, olefin sulfonates, monocarboxylic acid salts, ethoxylated alcohols and fatty acid ester sulfonates. Builder components include water-soluble phosphates (e.g. pentasodium triphosphate, tetrasodium pyrophosphate and sodium orthophosphate); organic builders (e.g. sodium nitrilotriacetate, sodium tartrate, trisodium carboxymethyloxysuccinate, sodium oxydisuccinate and sulfonate); (extended long-chain monocarboxylic acid sodium) and the like. Detergent builders suitable for use in the bar laundry soaps of the present invention include sodium triphosphate/sodium carbonate; tetrasodium pyrophosphate/sodium carbonate; and sodium triphosphate/tetrasodium pyrophosphate/sodium carbonate;
It is a mixture of sodium carbonate. Fillers such as calcite, various clays (eg, kaolin and bentonite), and sodium sulfate are non-essential ingredients, the amounts and selection of which are used based on volume and economic considerations. Other ingredients such as silicates (eg, alkali sodium silicate); starch, sodium carboxymethylcellulose, colorants, fluorescent agents, opacifying agents, disinfectants, fragrances including deodorizing agents, etc. may also be incorporated as desired. The bar laundry soaps of the present invention are prepared by neutralizing an anionic-active acid (e.g., an alkylbenzene sulfonic acid) with an alkali, e.g., sodium carbonate, e.g., in a high shear "Z" blade mixer, during or after neutralization. The dough is prepared by adding all or most of the water and then mixing this with suitable builders and fillers, and in the final mixing step bleaching agents, i.e. alkali metal sulfites (sodium) and optionally light. Add bleach and other sensitive ingredients in small quantities. Heat is generally generated during neutralization and hydration and due to high rate shear, but if not sufficient, approximately 60-65°C
Heat can also be applied to adjust the temperature. The following conditions must be taken into account: One or more active substances must be completely neutralized before adding sulphite to prevent the decomposition of the bleach and the formation of sulfur dioxide during production. It won't happen. The rate of decomposition of photobleachs increases with increasing temperature and pH, so if necessary use photobleachs (e.g.
AlPSC) should be added as a final ingredient after cooling the fabric to below 60 °C to minimize loss of photobleach during manufacturing. After this final mixing operation, the dough is passed through a roller mill and into an extruder. Satisfactory bar soaps can be obtained with a wide range of water contents, for example from 3.5 to 15% by weight, preferably from 6 to 11% by weight. Example - A laundry bar soap of the following composition was produced:

【table】

, and are the compositions of a laundry soap bar according to the present invention, and A is the composition of a comparative laundry soap bar containing no bleach. The laundry soap bars of the present invention and the fillers in them were slightly different from Comparative Bar Soap A, and the soap bars were extruded at relatively low temperatures without any processing problems. Additionally, penetrometry measurements taken immediately after extrusion indicated that the initial bar properties were little or not affected by the addition of bleach. Bar Soap Type : Bar Soap Temperature Average Penetration (℃) (mm) Measurements over a period of three months showed no loss of sulfite in all three bar soaps. Additionally, bleach loss during use was measured. Bar soap is analyzed before washing, and 37℃/70%
Leave (storage) overnight in a soap dish at RH. This wash/storage cycle was repeated and the soap bars were reanalyzed. The results are shown in Table 1 below: Table 1 Stability of bleach during use (initial value 100
(%) Na ₂ SO ₃ AlPCS (%) (%) Initial 100 100 After 1st storage 100 91.9 After 2nd storage 100 91.9 Both sulfite and AlPCS are known to be stable during use. found. Evaluation of bar soap performance using natural soils: The performance of the bar soap was compared to Bar Soap A on various bleachable protein soils. Performance comparison after bowl wash: The effect of applying bar soap directly to soiled areas was tested in the absence of sunlight. soaping stage
The soiled cloth from the stage was rinsed and tumble dried. Thus,
It was possible to distinguish the bleaching effect resulting from the locally high concentration of bar soap components on the fabric. From these results it is clear that sulfites are highly effective against most types of soils investigated. Despite the short contact time, significant improvements in soil removal were obtained with the bar laundry soaps of the present invention as shown in Table 2 below.

[Table] Under these conditions, the performance was in the following order: Bar Soap = Bar Soap > Bar Soap >> Bar Soap A In addition, the following simulated "wash habit"
The performance of the bar soap was evaluated under the following conditions: (a) Post-rinse irradiation (line drying) After washing, the fabric was rinsed and exposed to a Weatherometer (Atlas Electric Device Company, Chicago, IL). Line dried (irradiate) with a registered trademark of the Company. (b) Irradiation followed by rinsing (sun bleaching treatment) The fabrics were removed from the bowl wash and exposed to a Weather-O-meter for 30 minutes, 60 minutes, 90 minutes and 120 minutes before rinsing. The monitors were then rinsed and rolled dry. The following conclusions can be drawn from the above experiments: In normal use, bar laundry soap is rubbed directly onto the surface of textiles. As a result, a high concentration of solid soap components is locally present in the soiled area. Due to the presence of high concentrations of bleach (which has been shown to offer only a marginal benefit when delivered from a powdered solution) on the surface of textiles, this may be encountered in laundry regimes using typical bar laundry soaps. An outstanding bleaching action can be obtained despite low washing temperatures, short contact times and high soil loads. These benefits are obtained for most stains in the absence of light. In addition to this concentration effect, high effects can be obtained by irradiation (ie, solar bleaching) as shown in Table 3 below.

[Table] Examples The laundry bar soap of the example was compared with a similar bar laundry soap composition (comparative composition B) except that sodium perborate tetrahydrate was used in place of sodium sulfite. Bleach concentration in bar soap was measured after storage in sealed polyethylene bags at 37°C and 28°C. These results are shown in Table 4 below:

[Table] The above results show that the laundry bar soap () of the present invention has excellent bleach stability during storage. The bleach concentration in the bar soap was changed for the first and second time.
Measurements were taken under usage conditions after multiple washes. The results are shown in Table 5 below.

TABLE The bleach stability of the laundry soap bars of the present invention was clearly superior to that of the prior art laundry soap B. Example A bar soap was manufactured according to the formulation shown in the table below. The PH produced by each solid formulation was determined by grinding the fixed soap and dispersing it in deionized water to a concentration of 2.5% by weight (i.e., the composition to water ratio was 2.5:97.5). be). The dispersion is allowed to stand for a sufficiently long period of time to dissolve all soluble materials and
The PH of the dispersion was then measured at 20°C (some fluctuations in temperature do not appreciably affect the PH). Table test bar soap composition a b Alkaline benzene 31.0 18.0 Sodium sulfonate Primary alkyl sulfuric acid - 12.0 Sodium sodium carbonate 15.7 12.0 Alkaline silicic acid 1.4 2.9 Sodium (free basis) Aluminum sulfate 1.2 4.2 (anhydrous basis) Calcite (calcite) 16.1 17.9 Carboxymethyl 2.0 0.9 Sodium cellulose Sodium pyrophosphate 4.1 4.0 Sodium triphosphate 7.1 7.0 Sodium sulfate − 5.6 Sodium sulfite 15.0 8.0 Water 6.4 7.5 100 100 PH (2.5% dispersion 10.35 10.1

Claims (1)

[Scope of Claims] 1. A solid laundry soap for hand washing of textiles, comprising 15 to 45% by weight of anionic detergent active substances, 5 to 60% by weight of detergent builder substances, and 5 to 25% by weight of detergent builder substances.
% by weight of an alkali metal sulfite, the detergent builder material comprising a water-soluble carbonate to produce an alkaline cleaning solution during use of the laundry soap. 2. The soap according to claim 1, wherein the alkali metal sulfite is sodium sulfite. 3. Soap according to claim 1 or 2, containing 7.5 to 15% by weight of sodium sulfite. 4 The anionic detergent active substance contains 8 in the alkyl chain.
4. A soap according to claim 1, 2 or 3 which is a straight or branched chain alkylbenzene sulfonate having up to 16 carbon atoms. 5. A soap according to any one of claims 1 to 4, wherein the detergent builder substance is a mixture containing a water-soluble carbonate builder. 6. Claim 1 further comprising a photobleaching compound in an amount of 0.001 to 1.0% by weight based on the total bar soap composition.
The soap according to any one of items 5 to 5. 7. Soap according to claim 6, in which the amount of photobleaching compound is between 0.002 and 0.1% by weight. 8. Soap according to claim 6 or 7, wherein the photobleaching compound is aluminum phthalocyanine sulfonate. 9. A solid laundry soap used for hand washing textile products, containing 15 to 45% by weight of anionic detergent active substance;
A solid laundry soap comprising 5 to 60% by weight of detergent builder substances and 5 to 25% by weight of alkali metal sulfites, and containing water-soluble carbonates in which the detergent builder substances produce an alkaline cleaning solution during use of the laundry soap. A method of manufacturing a fabric by neutralizing an anionic active acid with an alkali, adding all or most of the composition water during or after neutralization, and then mixing this with a detergent builder substance. 1. A method for producing a bar laundry soap, characterized in that alkali metal sulfite is added in a final mixing step, and then the dough is passed through a roller mill and then extruded to form a bar soap. 10. The method of claim 9, wherein a photobleaching compound is added together with the alkali metal sulfite. 11 Claim 9 or 10 which adds a photobleach when the dough temperature drops to 60°C or less
The method described in section. 12. The method according to any one of claims 9 to 11, wherein the alkali used in the neutralization reaction is sodium carbonate.