JPS5986700A - Powder soap composition - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a powder soap composition containing soap, α-sulfo fatty acid ester salt, and fatty acid polyethylene oxide condensate in a predetermined ratio. This invention relates to a powder soap composition with excellent dispersibility.

Conventionally, soaps, that is, alkali metal salts of fatty acids, have been used in laundry detergents because of their excellent detergency and safety.

However, powdered soaps generally have poor solubility in cold water (and also have the disadvantage that they react with calcium, magnesium, or iron ions in hard water, producing water-insoluble divalent metal soaps, resulting in various adverse effects). This water-insoluble divalent metal soap aggregates in water and becomes so-called scum that is deposited on the items to be washed, causing off-odor and yellowing of the items to be washed.Furthermore, this scum forms a layer on the container to be washed. This results in what is called "black goba." All of these negative effects cause complaints from consumers and seriously damage the product image.

Until now, soaps with short chain length fatty acids, such as those containing high amounts of lauric acid soap, have been proposed to improve solubility in cold water, but these soaps are not always satisfactory in terms of low cleaning performance. It is also known that metal chelating agents and scum dispersants are added for the purpose of preventing scum generation or dispersing scum, but even when these agents are used, there is still sufficient sodium, etc. Even if a suitable amount of a metal chelating agent is added to a washing bath, it becomes infinitely diluted during rinsing and loses its effectiveness, resulting in the formation of scum, as well as other previously proposed methods. [J,
A.O.

a, S,, Su, 35-(1971)), or betaine, sulfobetaine [J, A, O, C! ,S, ,dan[
1), (1978)] or amphoteric surfactants of the aminocarboxylic acid type [J, A.

Even if 0, C, S, Dan, 652-(1972) E, etc. were used, the generation of scum could not be completely prevented and the above-mentioned problems could not be solved.

As a result of intensive research to overcome the drawbacks of detergents containing soap, the present inventors have developed α-sulpo fatty acid ester salts as scum dispersants and fatty acid polyoxyethylene oxide condensates as solubility improvers. It has been found that by selecting a combination of the following and blending the two into a soap, it exhibits excellent scum prevention properties and significantly improves solubility.Based on this knowledge, the present invention was completed.

That is, the present invention provides (A) a saturated fatty acid having 16 to 2 carbon atoms;
0 to 60% by weight, (same general formula % formula % (11 (in the formula, R1 is an alkyl group or alkenyl group having 8 to 18 carbon atoms, R2 is an alkyl group having 1 to 4 carbon atoms, and M is an alkali metal ) 5 to 25% by weight of an α-sulfo fatty acid ester salt represented by (C) general formula % formula % ([1 (R5 in the formula is an alkyl group or alkenyl group having 8 to 12 carbon atoms, n is 1 to 5 ) A fatty acid polyethylene oxide condensate represented by 0.5
The present invention provides a powder soap composition characterized in that it contains ~5% by weight.

The soap used as component (A) in the composition of the present invention preferably has a total carbon number of 10 to 2 o, but may contain 20% by weight or more of a sodium salt of a saturated fatty acid having a carbon number of 16 to 2 o. is necessary. If the sodium salt of saturated fatty acid is less than 20% by weight, cleaning performance and particle strength when formed into granules are poor, which is not preferable.

The soap components can be prepared by mixing individually made soap components or by neutralizing mixtures of each fatty acid.

These raw materials are preferably natural animal or vegetable oils, such as beef tallow, palm oil, coconut oil, palm kernel oil, or hardened products thereof.

The soap content in the composition of the present invention is 20 to 60%
% by weight, preferably in the range of 25-50% by weight,
If the content is less than 20% by weight, the performance as a soap powder will not be fully exhibited, and if it exceeds 60% by weight, it will be extremely difficult to dissolve in water during use.

In the composition of the present invention, the α-sulfo fatty acid ester salt used as the Bl component has a structure represented by the above general formula The fatty acid ester derived from
Produced by esterification with ~4 alcohols followed by neutralization. In this case, as the fatty acid or fatty acid ester used as a raw material, fatty acids or esters thereof having a predetermined number of carbon atoms derived from natural fats and oils (e.g., beef tallow, coconut oil, palm oil, palm kernel oil, etc.) can be used. Synthetic fatty acids with a predetermined number of carbon atoms or esters thereof derived from alcohols, olefins, etc. can be used.

In addition, during the production of α-sulfo fatty acid ester salt, an α-sulfo fatty acid base base represented by the general formula % (R4 and M in the formula have the same meanings as above) is produced as a by-product, but the amount is 20
If it is less than % by weight, there is no particular adverse effect.

The content of α-sulfo fatty acid ester salt in the composition of the present invention is 5 to 25% by weight, preferably 15 to 205 to 20% by weight.
It is 0% by weight. If this amount is less than 5 parts by weight, a satisfactory scum prevention effect cannot be obtained and it is not desirable in terms of product value, and if it exceeds 25 parts by weight, there will be a significant amount of foam left after rinsing, making it necessary to rinse many times. There is something that I don't like.

The fatty acid polyethylene oxide condensate used as the tC1 component in the composition of the present invention has the general formula (I[l
It has a structure shown in the following and can be obtained by condensing 1 to 5 moles of ethylene oxide to 1 mole of a fatty acid having a total of 10 to 14 carbon atoms according to a conventional method. Anything other than this is less effective as a solubility improver. Typical fatty acids having 10 to 14 carbon atoms include coconut oil fatty acid, lauric acid, barristic acid, palm kernel oil fatty acid, and the like.

The content of the fatty acid ethylene oxide condensate in the composition of the present invention is in the range of 0.5 to 5% by weight, preferably 1 to 3% by weight, and if this amount is less than 0.5% by weight, the content is 5% by weight.
If the weight ratio exceeds 5, foaming and scum dispersibility deteriorate, which is not preferable.

In addition to the above-mentioned essential ingredients, the powder soap composition of the present invention contains conventional auxiliary additives used in ordinary powder detergents and powder soaps, such as 2) IJ sodium lotriacetate, sodium ethylenediaminetetraacetate, Zeolites, builders such as sodium carbonate and sodium silicate, fillers such as sodium sulfate, carboxymethylcellulose (OMO) and polyethylene glycol (PEG)
anti-recontamination agents, other stabilizing agents, enzymatic bleaching agents, etc.
It can contain optical brighteners, fragrances, pigments, etc.

The powder soap composition of the present invention is achieved by blending α-sulfo fatty acid ester salt and fatty acid polyethylene oxide condensate into fatty acid soap, which cannot be achieved with conventional soap detergents due to their unique interaction. It has excellent effects.

That is, the uninvented powder soap composition can prevent the formation of scum during washing, and exhibits good solubility and detergency.

Next, the present invention will be explained in more detail with reference to Examples.

The performance of the powder soap compositions in Examples and Comparative Examples was evaluated according to the following method.

Scum dispersibility evaluation In advance, a black vinyl chloride board (20 cm long x 1 wide)
A solution of the composition in tap water (5DH) of 0.14t16 was prepared in a washer (spiral type, reversible type) with the water surface attached so that the water surface was in the center. Using a cotton knitted skin shirt, the bath ratio was 1:30 at 25°C.
(After dehydrating the cloth for 1 minute and rinsing it twice with water that does not contain the composition for 3 minutes, carefully remove the vinyl chloride board and check if there is any scum attached.) The scum dispersibility was evaluated according to the following criteria.

○There is almost no deposit of niscum or there is only a slight deposit of scum.

×: A lot of scum deposits are seen.

Powder soap composition prepared according to Examples and Comparative Examples (
Average particle size: approx. 300μ) II was washed (machine (National NA)
-33 type) into water 51 which had been adjusted to 5°C and 4DH in advance, stirred for 5 minutes, immediately filtered, and calculated using the following formula.

Examples 1 to 3 Using soap consisting of the fatty acid composition shown in Table 1, α
- Prepare a composition shown in Table 2 by mixing a spray-dried product consisting of a sulfo fatty acid ester salt, soap, and sulfur salt, and a spray-dried product consisting of a component other than the α-sulfo fatty acid ester salt, and prepare a composition shown in Table 2. Solubility and scum dispersibility were evaluated. The results are shown in Table 2.

Comparative Examples 1 and 2 Using soap consisting of the fatty acid composition shown in Table 1, α
- The compositions shown in Table 2 were prepared in the same manner as in the examples when containing sulfo fatty acid ester salts, or by spray drying all the components when not containing α-sulfo fatty acid ester salts. The same evaluation as in the example was performed. The results are shown in Table 2.

Table 11 - Note) Sodium α-sulfofatty acid methyl ester (1
): α-sulfobalm oil fatty acid methyl ester sodium Examples 4-8. Comparative Examples 3 to 4 Using a soap having the same fatty acid composition as in Example 1,
Compositions shown in Table 3 were prepared in a similar manner and their scum dispersibility and solubility were evaluated.

13-7c m12= The results are shown in Table 3.

. −
14-Note) α-sulfo fatty acid methyl ester sodium (1): Same as above α-sulfo fatty acid methyl ester sodium (2): α
- Sodium sulfopalmitate patent applicant
Lion Co., Ltd. Agent Akira Agata 761-

Claims (1)

[Scope of Claims] 1 (A) saturated fatty acid having 16 to 20 carbon atoms) 20 to 60% by weight of a soap containing 20% by weight or more of IJum, (B) general formula % formula % (in the formula, R1 is 5 to 25% by weight of an α-sulfo fatty acid ester salt represented by an alkyl group or alkenyl group having 8 to 18 carbon atoms, R2 is an alkyl group having 1 to 4 carbon atoms, and M is an alkali metal, (C1 general formula %) Fatty acid polyethylene oxide condensate represented by the formula % (R3 in the formula is an alkyl group or alkenyl group having 8 to 12 carbon atoms, and n is 1 to 5) 0.5
A powder soap composition characterized in that it contains 5 parts by weight.