JPH0453918B2 - - Google Patents

Description

[Detailed description of the invention]

Industrial Application Field The present invention is applicable to handwashing of textile products.
This invention relates to an improved laundry bar for use in laundry bars. BACKGROUND OF THE INVENTION Solid laundry soaps used for hand washing of textiles, unlike the disintegrating tablets or detergent soaps used for washing machines or bowl washing, require no post-manufacturing handling,
It must have good strength to ensure that its integral structure is retained during transportation and use. These bar soaps are popular because they are economical to use, and because they can be 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. Especially suitable for. Bar laundry soaps commonly known in the art, such as those described in GB 2,083,490, typically contain from about 7 to about 45% detergent actives and about 5% by weight detergent actives.
Contains ~60% by weight of detergent builder materials and several optional ingredients such as abrasives, fillers, fragrances, colorants and alkali salts. These are used under cold or lukewarm water conditions. It has also been proposed to include bleach in solid laundry soaps to improve their cleaning performance, but this has not yet been successful. German Patent Application No. 1086214 discloses a built-up solid detergent containing sodium perborate. Bar soap used for hand washing textile products: 1
Unlike disintegrating tablet detergents that are used for multiple laundry operations, sodium perborate is used repeatedly, so when incorporating sodium perborate into solid laundry soaps, it is important not only to store the soap before use but also during use (i.e., during the first use). A major problem is that the bleach must remain stable in the soap (after each subsequent use and after contact with water). 15-45% by weight of anionic detergent actives and 5-60% by weight
When a small amount of magnesium silicate (MgSiO ₃ ) and sodium perborate are incorporated into a solid laundry soap composition containing % by weight of detergent builder substances, it has excellent cleaning performance and high stability during storage before use and during use. It has now been discovered that improved bar laundry soaps for use in hand washing products are obtained. The amount of magnesium silicate depends on the amount of perborate in the bar soap, but is usually about 0.5% to 2.5% by weight or less, preferably about 1 to 2% by weight, and about 5 to 30% by weight. A range of amounts of perborate present are sufficient to provide the required stability. The stabilizer can be added to the bar soap mix as magnesium silicate during manufacture, or it can be formed in situ, for example from magnesium sulfate and sodium silicate. Sodium perborate is its tetrahydrate salt (NaNO ₃
H ₂ O ₂・3H ₂ O) or its monohydrate (NaBO ₃・
H ₂ O ₂ ) may be used, but the latter is preferred. The main advantage of sodium perborate monohydrate is that it has an equivalent available oxygen standard.
It is more effective on a weight basis than sodium perborate tetrahydrate. The preferred range is approximately 6.5
~15% by weight sodium perborate monohydrate and ca.
~22% by weight sodium perborate tetrahydrate. Therefore, the bleach-containing solid laundry soap used for hand washing textile products provided by the present invention has a bleaching agent content of 15%.
It consists of ~45% by weight anionic detergent actives, 5-60% by weight detergent builder materials, about 5-30% by weight sodium perborate, and up to 0.5-2.5% by weight magnesium silicate. Satisfactory bar soaps of this composition include, for example:
They can be manufactured to have a wide range of moisture contents, from 3.5 to about 15% by weight, preferably from 6 to 11%. Further improvements can be achieved by incorporating heavy metal ion sequestrants into the bar soap, such as ethylenediaminetetraacetate, ethylenediaminetetra(methylenephosphonate), diethylenetriaminepenta(methylenephosphonate) and nitrilotriacetate. These heavy metal ion sequestering agents can also be used in the form of their acids or their water-soluble salts, especially alkali metal salts (eg sodium salts).
These sequestrants, along with magnesium silicate, are present in small quantities, approximately 0.05% by weight of the total bar soap composition.
~ up to about 0.7% by weight, preferably about 0.1-0.5% by weight
used within the range. A preferred sequestering agent is ethylenediaminetetraacetate (EDTA)
and nitrilotriacetate (NTA). The detergent active ingredients and builder ingredients that can be used in the present invention are those conventionally used in the art. These ingredients are described in Schwartz and Perry, Surface Active Agents, Volume 1 (Interscience, 1958). The detergent actives that can be used belong to the general category of anionic 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 ) benzenesulfonates;
It may be used alone or in combination with other active substances, 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); water-soluble carbonates (e.g. sodium carbonate); organic builders (e.g. sodium nitrilotriacetate, sodium tartrate, carboxymethyloxy Examples include trisodium succinate, sodium oxydisuccinate and sodium sulfonated long chain monocarboxylate. Detergent builders suitable for use in the laundry soap bars of this invention are builder mixtures consisting of water-soluble carbonates. Examples of suitable builder mixtures of this type are mixtures of sodium triphosphate/sodium carbonate; tetrasodium pyrophosphate/sodium carbonate; and mixtures of sodium triphosphate/tetrasodium pyrophosphate/sodium carbonate. For example, calcite, various clays (e.g.
Fillers such as kaolin and bentonite) and sodium sulfate are non-essential ingredients, the amount and selection of which are taken with volume and economic considerations in mind. Other ingredients such as silicates (e.g. alkaline sodium silicate); starch, sodium carboxymethylcellulose, colorants, fluorescent agents, opacifiers,
Bactericidal agents, fragrances including deodorizing agents, etc. can also be added as desired. The solid laundry soap of the present invention is prepared by neutralizing an anionic-active acid (e.g. alkylbenzene sulfonic acid) with an alkali, e.g. sodium carbonate, and removing all or most of the water in the composition during or after neutralization. and then mix with appropriate builders and fillers, for example in a high shear "Z" blade mixer, to form a dough, and in the final mixing step sodium perborate, magnesium silicate (or magnesium sulfate + sodium silicate). and other minor ingredients, said method being preferred. Heat is generally generated during neutralization and hydration, as well as by high rate shear, but if insufficient, heat can be added to adjust the temperature to about 60-65°C. The temperature required for successful incorporation of perborate is critical, so the dough temperature during perborate addition is 50°C.
The temperature should not exceed 45°C, preferably below 45°C. This temperature is also the temperature at which other sensitive ingredients such as perfumes, fluorescent agents, etc. can be incorporated with minimal loss. You may adjust the moisture content by adding the remaining water. After this final mixing operation, the dough is passed through a roller mill and then an extruder.

[Table] , , and are the compositions of the bar laundry soap of the present invention, and A is the composition of a comparative laundry soap bar containing no bleach. The solid laundry soaps of the present invention have slightly different fillers from Comparative Bar Soap A, and because of the presence of perborate, these bar soaps were extruded at relatively low temperatures, but during processing. No problems occurred. Furthermore, penetrometer measurements taken immediately after extrusion showed that the incorporation of perborate tends to harden the bar soap. Types of bar soap : Bar soap temperature average penetration (℃) (mm)
and 28℃/70%RH and 37℃/70%
As measured at RH over a three-month period, the bar soap and sodium perborate monohydrate and the sodium perborate tetrahydrate bar soap and bar soap were relatively stable when stored under humid conditions.
and the bar soap of the present invention, and
It was observed that it was clearly superior to bar soap A regardless of the presence or absence of EDTA. When the perborate-containing bar soap of the present invention was encapsulated in a polyethylene bag, the appearance of the bar soap was improved, but no improvement in stability was shown. Furthermore, the loss of bleach during use was investigated for bar soap (10% perborate tetrahydrate) and bar soap (15% perborate monohydrate). Bar soap is analyzed before washing, and 37℃/70%
It was left in a soap dish at RH overnight. This wash/stand (storage) cycle was repeated and the soap bars were reanalyzed. The results are shown in Table 1 below: Table 1 Stability of bleaching system during use (initial value set to 100%) Soap Soap Sodium Sodium Tetrahydrate (%) Monohydrate (%) ) Initial 100 100 After first storage 89.2 87.2 After second storage 75.8 83.8 Performance evaluation of soap using natural soils: The effect of bar soap on a variety of bleachable protein stains was evaluated. Compared with A. Performance comparison after bowl wash: The effect of applying bar soap directly to the soiled area was tested in the absence of sunlight. soaping stage
The soiled cloth from the stage was rinsed and tumble-dried. It was thus possible to distinguish only the bleaching effect resulting from the locally high concentration of bar soap components on the fabric. From these results it is clear that perborates are highly effective against most types of soils investigated. Despite the short contact time, the bar laundry soaps of the present invention provided significant improvements in soil removal as shown in Table 2 below.

[Table] Comparison of performance after line drying: After washing, rinse the fabric and dry it with a Weather-Ometer (Atlas Electric, Chicago, Illinois).
Line drying was carried out at Device Company (registered trademark). The results are shown in Table 3 below.

[Table] Example After being bleached by sunlight, the performance of the bar soap of the present invention containing 10% sodium perborate tetrahydrate and Comparative Soap A was compared. The results are shown in Table 4.

[Table] Examples Table 5 below shows the results when solid laundry soap containing 10% sodium perborate tetrahydrate together with various stabilizers was stored in polyethylene bags at 37°C, 28°C, and 20°C, respectively. of perborate stability.

【table】

TABLE Examples Table 6 below shows perborate stability in bar laundry soaps containing 10% sodium perborate tetrahydrate with 2% magnesium silicate.

[Table] Examples Table 7 below shows perborate in a solid laundry soap containing 10% sodium perborate tetrahydrate with magnesium silicate (magnesium sulfate + sodium silicate) produced in situ at 37°C. Indicates stability.

[Table] The basic solid laundry soap composition used in Examples is as follows. Ingredient weight% Sodium DOBS 28.00 Sodium carbonate 10.00 Tetrasodium pyrophosphate 16.00 Sodium sulfate 4.86 Calcium carbonate 31.73 SCMC 2.00 Fluorescent agent 0.24 Flexonil blue 0.05 Titanium dioxide 0.15 Fragrance 0.30 Water 6.50 Impurities, NDOM, etc. Up to 100.00

Claims (1)

[Claims] 1. 15 to 45% by weight of anionic detergent active substance and 5 to 45% by weight of anionic detergent active substance.
A bleach-containing solid laundry soap for hand-washing textile products, characterized in that it comprises 60% by weight of detergent builder substances, 5-30% by weight of sodium perborate and 0.5-2.5% by weight of magnesium silicate. 2. Soap according to claim 1, containing 1 to 2% by weight of magnesium silicate. 3. The soap according to claim 1 or 2, wherein the sodium perborate is sodium perborate monohydrate. 4 Anionic detergent active substance in alkyl chain 8-16
A soap according to claim 1, 2 or 3 which is a straight or branched chain alkylbenzene sulfonate having 5 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. A soap according to any one of claims 1 to 5, comprising a heavy metal ion sequestering agent in an amount of about 0.05 to 0.7% by weight based on the total bar soap composition. 7. Soap according to claim 6, wherein the amount of heavy metal ion sequestering agent is 0.1 to 0.5% by weight. 8. The soap according to claim 6 or 7, wherein the heavy metal ion sequestering agent is ethylenediaminetetraacetate (EDTA) or nitrilotriacetate (NTA). 9 15-45% by weight of anionic detergent actives and 5-45% by weight of anionic detergent actives
A method for producing a bleach-containing solid laundry soap for use in hand washing textile products, comprising 60% by weight of a detergent builder substance, 5 to 30% by weight of sodium perborate, and 0.5 to 2.5% by weight of magnesium silicate. , the anionically active acid is neutralized with an alkali, all or most of the composition water is added during or after neutralization, and the detergent builder material is then mixed to create a dough, to which it is added in the final mixing step. Bleaching characterized by comprising the steps of adding sodium perborate and magnesium silicate while ensuring that the temperature of the dough does not exceed 50°C, and finally passing the dough through a roller mill and extruding it to form individual soaps. A method for producing a solid laundry soap containing a chemical agent. 10. The method according to claim 9, wherein magnesium silicate is added in the form of magnesium sulfate and sodium silicate and reacted in situ during the process. 11. The method according to claim 9 or 10, wherein the temperature of the dough at the time of addition of perborate is less than 45°C. 12. The method according to claim 9, 10 or 11, wherein the alkali used in the neutralization reaction is sodium carbonate.