JPH0637640B2 - High bulk density granular detergent composition - Google Patents

Description

TECHNICAL FIELD The present invention relates to a granular detergent composition having a high bulk density, which prevents deterioration of the color tone of detergent particles due to storage.

2. Description of the Related Art Conventional detergents for clothing have a bulk density of about 0.3 g / cc obtained by adding an extender (usually Glauber's salt is used) that hardly contributes to the cleaning performance to the composition and spray-drying it. It was manufactured as bead-shaped hollow particles.

However, since such detergents have a low specific gravity and a low concentration of activator, they are costly to transport and require considerable space for storage and display. It was So recently,
A method for producing a high bulk density granular detergent which can be washed with a small amount of detergent has been proposed (Japanese Patent Laid-Open No. 60-96698) and is also on the market.

On the other hand, the fatty acid lower alkyl ester sulfonate is
It is a surfactant having excellent detergency, especially hard water resistance, and a high bulk density detergent composition containing the same has been reported (JP-A-62-597).

However, the high bulk density granular detergent has a problem that the color tone of the detergent particles deteriorates upon storage.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention provides a high bulk density granular detergent composition in which the color tone of the detergent particles is not impaired before and after storage.

Composition of the Invention The high bulk density granular detergent composition of the present invention is characterized by containing the following components (a), (b) and (c).

(a) Sulfonate of fatty acid lower alkyl ester having 8 to 22 carbon atoms in fatty acid residue; 5 to 30% by weight.

(b) Salt of fatty acid sulfonate having 8 to 22 carbon atoms in fatty acid residue; 0.01 to 3% by weight.

(c) Aluminosilicate; 5-40% by weight.

Hereinafter, the present invention will be described in more detail.

The sulfonic acid salt of a fatty acid lower alkyl ester is typically represented by the following general formula (I), which is also called an α-sulfo fatty acid ester salt.

^{(R 1:} an alkyl group R ^2: _{C 1 to 3} about the lower alkyl group M: counter ion) as the counter ion is a water-soluble salt is used, the alkali metal salts, especially sodium salts.

Sulfonate of saturated fatty acid lower alkyl ester is obtained by obtaining a fatty acid lower alkyl ester having a predetermined number of carbon atoms by transesterification or esterification of fatty acid, and then reacting with a sulfonating agent such as anhydrous sulfuric acid using an ordinary sulfonation apparatus. It is obtained by aging, bleaching, and then neutralizing, if necessary. It can also be obtained by converting a sulfonated fatty acid into a lower alkyl ester.

Further, a sulfonate of an unsaturated fatty acid lower alkyl ester is also used, and is produced in the same manner as described above using an unsaturated fatty acid having a predetermined carbon number as a starting material.

As the raw material fatty acid, a fatty acid of a predetermined carbon number derived from animals and plants derived from beef tallow, coconut oil, palm oil, or the like, or a synthetic fatty acid is used.

The fatty acid residue of the fatty acid lower alkyl ester sulfonate has 8 to 22 carbon atoms, preferably 10 to 18 carbon atoms.

In the fatty acid lower alkyl ester sulfonate, those having specific carbon numbers such as (a) and (b) below are (a) / (b) = 1/9 to 6
/ 4, preferably (a) / (b) = 2/8 to 5/5 in combination in a weight ratio to improve the solubility of the detergent composition.

(A): Aliphatic residue C _12-14 .

(B): Aliphatic residue C _16-18 .

The fatty acid lower alkyl ester sulfonate of component (a) is contained in the detergent composition in an amount of 5 to 30% by weight, preferably 8 to
25% by weight is blended. If the content is less than 5% by weight, sufficient detergency cannot be obtained, while if it exceeds 30% by weight, production becomes difficult.

The fatty acid sulfonate salt of component (b) has 8 to 22 carbon atoms,
Preferably, it is obtained as a di salt (fatty acid salt, sulfonate) by sulfonation neutralization of 10 to 18 fatty acids. The content of the component (b) in the detergent composition is in the range of 0.01 to 3% by weight, preferably 0.05 to 2.9% by weight, and if it deviates from this range, deterioration of the color tone of the detergent particles cannot be sufficiently prevented.

As the aluminosilicate as the component (c), a crystalline or amorphous aluminosilicate represented by the following general formula (II) or a mixture thereof is suitable.

x (M ₂ O or M′O) · A ₂ O ₃ · y (SiO ₂ ) · w (H ₂ O) ... (I
I) (wherein M is an alkali metal atom, M'is an alkaline earth metal atom that can be exchanged with calcium, x, y and w are the respective mole numbers of each component, and generally x is 0.7 to
1.5, y is 1 to 3, and w is an arbitrary number. It is desirable that the average particle size of the aluminosilicate be 5 μm or less, preferably 1 μm or less, from the viewpoint of detergency.

The aluminosilicate is incorporated in the detergent composition in an amount of 5 to 40% by weight, preferably 10 to 30% by weight.

The high bulk density detergent composition of the present invention may contain optional components such as other surfactants and builders in addition to the above-mentioned essential components (a), (b) and (c).

Examples of the anionic surfactant include the followings.

1) a linear alkylbenzene sulfonate having an alkyl group having an average carbon number of 8 to 16; 2) an α-olefin sulfonate having an average carbon number of 10 to 20; 3) an alkyl sulfate having an average carbon number of 10 to 20; ) Alkyl ether sulfates or alkenyl ether sulfates having a linear or branched alkyl or alkenyl group having an average carbon number of 10 to 20 and having an average of 0.5 to 8 mol of ethylene oxide added, 5) Average carbon number of 10 ~ 22 saturated or unsaturated fatty acid salts.

Alkali metal salts such as sodium and potassium are usually suitable as counterions in these anionic surfactants.

The following are suitable as the nonionic surfactant.

(1) An EO-added nonionic surfactant obtained by adding 4 to 25 mol of ethylene oxide (EO) on average to a primary or secondary alcohol having 8 to 18 carbon atoms.

(2) EO-PO-added nonionic surfactant obtained by adding an average of 4 to 25 mol of ethylene oxide (EO) and an average of 3 to 15 mol of propylene oxide (PO) to a primary or secondary alcohol having 8 to 18 carbon atoms. Agent.

Furthermore, inorganic builders such as sodium tripolyphosphate and sodium pyrophosphate; sodium citrate, sodium ethylenediaminetetraacetate, nitrilotriacetic acid salt, sodium polyacrylate, sodium acrylate-sodium maleic anhydride copolymer, polyacetal carboxylate, etc. Calcium ion trapping builder; carbonate, silicate, etc. alkali builder; carboxymethyl cellulose, polyethylene glycol, etc. recontamination inhibitor;
Rinse improver such as soap; paratoluene sulfonate,
Viscosity modifiers such as toluene sulfonate, xylene sulfonate, urea; enzymes such as protease, lipase, cellulase, amylase (alkaline lipase having activity especially in alkaline atmosphere); quaternary ammonium salt, bentonite, etc. Giving agent; bleaching agents, fluorescent agents, perfumes, dyes and the like can be used.

The detergent composition of the present invention has a bulk density of 0.
It is obtained by using a high bulk density composition of 5 to 1.2 g / cc. As this granulation method, as described in the above-mentioned JP-A-62-597, detergent raw materials such as fatty acid lower alkyl ester sulfonates are kneaded and mixed with a kneader, and a mill such as a cutter mill type is mixed. It is obtained by crushing and granulating with a crusher and further mixing with water-insoluble fine powder. Alternatively, a part or all of the detergent components may be previously spray-dried, and the spray-dried product may be kneaded and mixed with the rest of the detergent components to produce a high bulk density granular detergent composition. Components such as enzymes may be powder blended with a granular detergent.

EFFECTS OF THE INVENTION According to the present invention, (a) a sulfonate of a fatty acid lower alkyl ester, (b) a salt of a sulfonate of a fatty acid, and (c) an aluminosilicate compound are used in combination in a specific amount to provide a high bulk density detergent. It is possible to prevent the color tone of the detergent particles of the composition from being impaired by storage.

Examples In the following examples, each detergent composition was evaluated according to the following criteria.

Powder whiteness The sample is filled in a carton, and 35 ℃ -85% RH x 16 hours and 25 ℃-
It was stored under a recycling condition of 60% RH × 8 hours for 40 days, and the powder whiteness (b value) before and after storage was measured by a colorimetric color difference model Model Z-1001DP manufactured by Nippon Denshoku Co., Ltd.

Example 1 A high bulk density granular detergent composition (bulk density; 0.78 g / cc) having the composition shown in Table 1 below was produced.

The components shown in Table 1 below were kneaded with a kneader, and the resulting intimate mixture pellets (2 cm square) and A-type zeolite were quantitatively fed to a disintegrator (Okada Seiko, Speed Mill ND-30 type). At this time, cold air of 15 ° C. was introduced together with this crushed material at a ratio of 15 / kg of crushed material. Crusher rotates solutions cracking blades diameter 15cm at 3000rpm cross four stages, the screen with 2 mm ^phi, opening ratio of 20% punching metal.

Next, the crushed product and A-type zeolite with an average primary particle size of 3 μm were quantitatively fed to a rolling drum (D = 30 cm ^φ , L = 60 cm) at a ratio of 97: 3, and coated product at 30 rpm and a residence time of 5 minutes. Was discharged. The powder whiteness change of the obtained high bulk density detergent composition was evaluated and is shown in Table 1.

Claims (1)

[Claims] 1. A sulfonate of a fatty acid lower alkyl ester having 8 to 22 carbon atoms in a fatty acid residue; 5 to 30% by weight, and a sulfonate of a fatty acid residue having 8 to 22 carbon atoms in a fatty acid residue. A high bulk density granular detergent composition comprising 0.01 to 3% by weight of a salt and (c) an aluminosilicate; 5 to 40% by weight.