JPH0637639B2 - High bulk density granular detergent composition - Google Patents

Description

TECHNICAL FIELD The present invention relates to a high-density bulk granular detergent composition having excellent solubility.

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, a high bulk density detergent containing a sulfonate of a fatty acid lower alkyl ester has a problem that the solubility in water is not sufficient.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention provides a high bulk density granular detergent composition having excellent solubility.

Composition of the Invention The high bulk density granular detergent composition of the present invention comprises the following (a) and
The weight ratio of the component (b) is (a) / (b) = 1/9 to 6/4, and
5 to 30% by weight based on the total amount of the components (a) and (b) [(a) + (b)]
It is characterized by containing.

(a) Sulfonate of fatty acid lower alkyl ester having 12 to 14 carbon atoms in fatty acid residue.

(b) A sulfonate of a fatty acid lower alkyl ester having a fatty acid residue having 16 to 18 carbon atoms.

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.

The sulfonate of a saturated fatty acid lower alkyl ester is obtained by transesterifying or esterifying a fatty acid to obtain a fatty acid lower alkyl ester having a predetermined number of carbon atoms, and then reacting it with a sulfonating agent such as sulfuric anhydride using an ordinary sulfonation apparatus. It can be 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 and the like, and a synthetic resin acid are used.

The present invention is to improve the solubility in such a fatty acid lower alkyl ester sulfonate by using both components (a) and (b) having the following specific carbon numbers in a specific ratio. .

(a): Aliphatic residue C _12-14 .

(b): Aliphatic residue C _16-18 .

Both of these components are (a) / (b) = 1/9 to 6/4, preferably (a) /
(b) = Mixed at a weight ratio of 2/8 to 5/5. If this ratio is less than 1/9, the solubility will not be sufficiently improved, while if it exceeds 6/4, the detergency will deteriorate.

Further, the total amount of both components (a) and (b) is 5 to 5 in the detergent composition.
30% by weight, preferably 8 to 25% by weight is blended. If the blending amount is less than 5% by weight, sufficient detergency cannot be obtained.
If it exceeds the weight percentage, the production becomes difficult.

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

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.

6) An α-sulfo fatty acid salt represented by the following general formula.

(In the formula, Z is a counter ion and R is an alkyl group having 10 to 22 carbon atoms.) As a counter ion in these anionic surfactants, alkali metal salts such as sodium and potassium are usually suitable.

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, zeolite (aluminosilicate), inorganic builders such as sodium tripolyphosphate and sodium pyrophosphate; sodium citrate, sodium ethylenediaminetetraacetate, nitrilotriacetic acid salt, sodium polyacrylate, sodium acrylate-sodium maleate anhydrous Calcium ion scavenging builders such as polymers and polyacetal carboxylates; alkali builders such as carbonates and silicates; anti-redeposition agents such as carboxymethyl cellulose and polyethylene glycol; rinse improvers such as soaps;
Viscosity modifiers such as paratoluene sulfonate, toluene sulfonate, xylene sulfonate and urea;
Enzymes such as protease, lipase, cellulase and amylase (especially alkaline lipase which has activity in alkaline atmosphere); softening agents such as quaternary ammonium salt and bentonite; bleaching agents, fluorescent agents, fragrances, dyes, etc. You can

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, the solubility of a high bulk density detergent composition is improved by using two kinds of sulfonates of fatty acid lower alkyl ester having a specific carbon chain length in a specific ratio. You can

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

Solubility test Put water at 25 ℃ in a beaker and insert a cell for measuring conductivity. Then, 1 g of each detergent composition having the composition shown in the attached table was added to water, and the mixture was stirred at a speed of 250 rpm using a constant speed stirrer, and the time required for 90% of the added detergent particles to dissolve was measured to obtain T ₉₀ ( Seconds). Here, a HORIBA CONDUCTIVE METER DS-8F type was used as the conductivity meter.

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.

Knead each component (excluding enzymes) in Table 1 below with a kneader,
Pulverizer for the resulting intimate mixture pellets (2 cm square) and type A zeolite (Okada Seiko, Speed Mill ND-30 type)
Was quantitatively fed. At this time, cold air of 15 ° C. was introduced together with this crushed material at a ratio of 15 / kg of crushed material. The crusher has a diameter of 15 cm
The solution cracking blades rotating 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. Here, the enzyme was powder blended. The solubility of the obtained high bulk density detergent composition was evaluated and is shown in Table 1.

Claims (1)

[Claims] 1. A sulfonic acid salt of a fatty acid lower alkyl ester having 12 to 14 carbon atoms in a fatty acid residue and (b) a sulfonic acid salt of a fatty acid lower alkyl ester having 16 to 18 carbon atoms in a fatty acid residue. , (A) / (b) = 1/9 to 6/4 by weight, and (a) +
A high bulk density granular detergent composition comprising (b) in a total amount of 5 to 30% by weight.