PROCESS FOR PREPARING LAUNDRY POWDER DETERGENTS TECHNICAL FIELD The present invention relates to a process for preparing laundry powder detergents by means of an air lifter which indrafts an air, not using a counter current spray dryer. More specifically, the present invention relates to a process for preparing laundry powder detergents having excellent fluidity, solubility and anti-caking property and further having broad bulk density of 0.3-1.2g/ml, which process comprises supplying a liquid material and a powder material into the outlet portion and/or the other portion of the air lifter in which one or more continuous and/or batch mixer are mounted with an agitating shaft having an agitating fan, subjecting to a granulation or reaction and granulation of the supplied materials to form a powder of a detergent composition, supplying the powder into the outlet and/or the inner portion of the air lifter to pass them in the opposite direction to the air flow of the air lifter under appropriate temperature and drafting pressure, and then carrying out further granulation and surface modification.

BACKGROUND ART It has been widely known in prior arts that a powder detergent is prepared by using as a final product a dried particle having a low bulk density of less than 0.5g/cc dried by a counter current spray dryer, or by injecting and pulverizing the dried particle into the mixer, spraying a liquid material into the mixer to form a contacting point of the dried particle, coating water-insoluble materials such as zeolite, talc, etc. to give a powder detergent having a high bulk density, and then adding additives thereto to give the desired detergent product. However, these prior arts have disadvantages in that a continuous type work is likely to become difficult, a separate concentrating step is required to increase a bulk density; therefore, the product does not have a good quality and the costs for the production equipment and maintenance/repair management are high.

The processes for preparing powder detergents having a high bulk density by means of a counter current spray drier are disclosed in Japanese Patent Laid-open Nos. 86-69900,86-69898,94-9999 and 92-5080, and U. S. Patent No. 4,639,326. However, the processes disclosed in the above patent publications always involve a drying step; therefore, the solubility is poor; the preparing processes such as neutralization, blending, drying and concentrating steps are quite complicated; the costs for the production equipment and processes are high; and the energy efficiency is low.

EP-390251 (Unilever) and EP-544365 (Unilever) disclose processes for preparing a detergent composition without a spray-drying step. These processes prepare a detergent composition by forming an alkylbenzene sulfate and particulating it with a surface modifying agent, but the processes have disadvantages in that a thorough neutralization of fatty acid or alkylbenzene sulfonic acid is likely to become difficult; there remain unreacted materials; the product quality is poor; and the concentration of the detergent is limited. When the liquid material used as a binder are contained in a large amount, the prepared particle becomes sticky and the detergent takes place a hard caking phenomenon during storage. Further, when the counter current spray-drying process is not used, the cavity in the detergent particle is not formed; therefore, preparation of a detergent having a low bulk density of less than 0.7 g/cc is not possible, and an increase in the content of the liquid material becomes difficult.

DISCLOSURE OF THE INVENTION Under the above-described circumstances, the present inventors have made extensive studies on a laundry powder detergent composition and, as a result, have found that powder detergents having excellent fluidity, solubility and anti-caking property and further having a broad bulk density of 0.3-1.2g/ml can be prepared by the process which comprises supplying a liquid material and a powder material into the outlet and/or the other portion of an air lifter in which one or more continuous and/or batch mixer are mounted with an agitating shaft having an agitating fan, subjecting to a granulation or reaction and granulation of the supplied materials to form a powder of a detergent composition, supplying the powder into the outlet and/or the inner portion of the air lifter to pass them in the opposite direction to the air flow of the air lifter under appropriate temperature and drifting pressure, and then carrying out further granulation and surface modification.

BRIEF DESCRIPTION OF THE DRAWING While the specification concludes with claims which particularly point out and distinctly claim the invention, it is believed the present invention will be better understood from the following description of the embodiment taken in conjuction with the accompanying drawing.

Fig. 1 is a perspective view of an apparatus for the preparation of laundry powder detergents according to the present invention. In Fig. 1, the reference numbers have the following meaning: (a): air lifter (b) (e): agitating shaft of an agitator (c) (d): agitating fan (f): pulverizing device (chopper) (g) (i) (j) (n) (o): powder material supplying device (h) (k): surface modifying agent injecting device (1) (m): liquid material supplying device (p): powder drifting direction (q): air lifting direction (r): separately mounted mixer BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a process for preparing laundry powder detergents which process comprise: (i) supplying a liquid material and a powder material into an air lifter which indrafts an air in which one or more continuous and/or batch mixer is mounted with an agitating shaft having an agitating fan, subjecting to a reaction, blending, granulation and surface-modification of the supplied materials in the mixer, injecting them into the outlet and/or the inner portion of the air lifter in the vertical and/or diagonal direction, passing them in the opposite direction to air flow, and then carrying out further granulation and surface-modification; or (ii) subjecting to a reaction, blending, granulation and surface-modification of the liquid material and the powder material in one or more separately mounted mixer, injecting them into the outlet and/or the inside portion of the air lifter in the vertical and/or diagonal direction, passing them in the opposite direction to air flow, and then carrying out further granulation and surface modification; or (iii) subjecting to a reaction, blending, granulation and surface-modification of the liquid material and the powder material in one or more separately mounted mixer, further blending them in the mixer injected into the air lifter, injecting them into the outlet or the inner portion of the air lifter in the vertical and/or diagonal direction, passing them in the opposite direction to air flow, and then carrying out further granulation and surface modification.

When a partially neutralized precursor of the surfactant conventionally used for detergent, e. g., acidic materials such as alkylbenzene sulfonic acid, alpha-olefine sulfonic acid, alkylsulfonic acid, fatty acid, citric acid or succinic acid, and alkali builders such as soda ash, sodium bicarbonate, potassium carbonate (K2CO3), potassium bicarbonate (KHC03) and the like are blended at a high speed of from 50 to 4000 rpm, carbon dioxide and water are generated, with an absorbable porous structure being formed with the other materials and, at the same time, the liquid material being absorbed. Then the surface-modification is carried out with a surface modifying agent to be included in the powder material or to be separately injected. And if these are exposed to air under an appropriate temperature and flow rate, it is possible to adjust the evaporation and effervescent phenomenon of the moisture produced upon neutralization by the turbulent flow formed in the inner portion of the air lifter or contained in the materials themselves so that the surface-modification of the detergent particle may be carried out.

Therefore, the laundry powder detergent having excellent fluidity, solubility and anti-caking property and further having a broad bulk density of from 0.3 to 1.2 g/ml.

Referring to Fig. 1, a mixer having the liquid material supplying device (l) (m) and the powder material supplying device (g) (i) (j) (n) (o) is mounted with the outlet and/or the other position of the air lifter (a). The liquid material and the powder material are injected and then blended or reacted/blended at the speed of from 50 to 4000 rpm and, at the same time, a surface-modification is carried out with a surface modifying agent included in the powder material or separately injected. If necessary, the first blending is carried out in the mixer (r) mounted in the separate position. The mixtures are then moved to the mixer mounted with the air lifter (a) and the second blending can be carried out to prepare a powder of the detergent composition. The powder thus prepared is injected in the outlet and/or the inner portion of the air lifter (a) under drifting pressure of less than 2 kg/cm2 and air temperature of less than 400 °C and then is passed in the opposite direction to the air drifting direction (q) to evaporate the moisture contained in the raw material, while adjusting the neutralization and effervescent reaction, to thereby form a particle. The continuous processes of the granulation, neutralization, surface modification and drifting are carried out for a short period of time, the capability of preparation is increased and the product quality is good. Therefore, the laundry powder detergent composition having excellent fluidity, solubility and non-caking property and further having a broad bulk density of from 0.3 to 1.2 g/ml may be obtained.

The outlet of the air lifter (a) used in the present invention is constructed so that an air is drifted by an air indrafting device, a dust collector and a heat exchanger. The air lifter is mounted with a liquid material supplying device (l) (m), a powder material supplying device (g) (i) (j) (n) (o) and a mixer comprising an agitating shaft (b) (e) having an agitating fan (c) (d). The powder of the detergent composition is blended from a separately mounted mixer (r). Also, the powder of the detergent composition prepared from the separately mounted mixer (r) can be re-blended. The powder and liquid materials supplying devices injected in the mixer are smoothly blended and reacted. Each powder and liquid materials supplying devices are attached to the raw materials injecting devices capable of adjusting the amount of injection. So, the materials can be injected at a constant speed, and mixing ratio of each material can be adjusted optionally. Also, the powder and liquid materials supplying devices are provided with the mixer, if desired, and can be added to the air lifter.

The outlet of the air lifter is constructed so that an air can be drifted by a dust collector and a heat exchanger. It is advisable to be closed, but it is possible to provide a ventilation hole so as to adjust an air pressure of the inner portion. The dust collector acts as collecting from air a fine particle taken place in the course of preparation. The fine powder of the collected detergent composition is drifted to the powder material supplying device and is recycled.

The fluidized direction of the powder detergent which is drifted by the air lifter is positioned so that the air injecting port in the opposite direction to the air to be injected is arranged in the lower position when compared to the air outlet. The drifting direction of the air and detergent particle is in the opposite direction. A fresh air contacts with the detergent particle continuously to carry out a rapid reaction and a water evaporation.

By adjusting the air pressure and the injection amount of materials, a surface-modification under various conditions is possible and the product quality is good. Hence, the laundry detergent product having excellent fluidity, solubility and anti-caking property and further having a broad bulk density of from 0.3 to 1.2g. ml can be obtained.

The air lifter can be provided in the vertical and/or diagonal direction so that the particle of the detergent composition can be dropped by a gravity. The air lifter can be selected depending upon the plant building and the area to have the production instrument, and/or upon the composition or property of the product. They are not particularly limited.

The mixer can be provided in the outlet position of the air lifter (a) or in the separate position with the air lifter (a). When the mixer is positioned at the air outlet, the powder drifting direction (p) is in the opposite direction to the air flow. Hence, the time of drifting the detergent particle become long and the detergent particle contacts with a fresh air continuously to make a through neutralization during drifting. Therefore, it is more preferred when the materials are contained in a large amount or a further through reaction has to be carried out. The laundry detergent product having a broad bulk density may be prepared by adjusting the air pressure and temperature.

The process of the present invention has advantages when the powder of the detergent composition is prepared from the mixer mounted separately with the air lifter and is injected into the air lifter ; an adjustment of the time of blending the used materials is required, or when the powder material is contained in a larger amount than the liquid material and so it is required to carry out a blending for a relatively long period of time, or when additives or further surface modifying agent are injected into the outlet and/or the inner portion of the air lifter. In this case, since the reaction of the particles is made slowly, an excessive reaction is not made rapidly and the properties of the particles such as a bulk density of the detergent prepared is excellent.

When the powder of the detergent composition is prepared from the mixer mounted separately with the air lifter and is further blended in the mixer having the air lifter, this approach is used in case where the powder material is contained in a larger amount than the liquid material in a continuous process and the blending must be carried out for a relatively long period of time, or in case where the reactivity of the liquid material is low and the reaction must be carried out by a further strong agitation.

In this case, the detergent having a higher bulk density may be obtained than when once blended.

The mixer may use a continuous or a batch type. The continuous type produces the product without stop and the deviation between lots is low. Hence, the continuous type is proper for a large production and it is possible to mount both with the air lifter and with the other position.

For the batch type, a rotating shaft having an agitating fan is provided in the vertical and/or horizontal direcction. The batch type optionally mounted with a separate chopper may be used for the preparation of a conventional detergent. These batch types include a rotating drum mixer, a vertical orbiting screw mixer, a ribbon mixer, a Lödige mixer, a high speed mixer and the like. For the continuous type, the rotating shaft : having an agitating fan is provided in the vertical and/or horizontal direction. The continuous type optionally mounted with a chopper may be used for the preparation of a conventional detergent. These continuous types include a Lödige mixer, a Schugi mixer, a Kette mix reactor, a rotating drum mixer and the like. But the types of the mixer are selected depending upon the properties of the materials to be blended. The mixer is not particularly limited.

The speed of the air which drifts a powder of the detergent composition is preferably less than 15m/sec. When the speed is more than 15m/sec, the powder is drifted in the air-flow direction and is moved to the dust collector and heat exchanger in which a dust collection and a heat exchange are not well done; the air of the air lifter is combined with a particle of the detergent composition; the lump is not evenly absorbed/blended. For the liquid-rich portions, particles are combined with each other to form a lump, and for the liquid-free portions particles are present in the powder form without a liquid material. Therefore, an ununiform product with a low commercial value is obtained.

The air injected in the air lifter is produced either under the atmosphere or by the air producing device in which a cooling and a heating are possible. The temperature is preferably from 0 to 400°C. The lower the temperature, the slower the neutralization. By not showing a rapid expansion of the volume it is advantageous to prepare the detergent product having a high bulk density or the detergent composition either having a small content of the acidic material to be neutralized or not containing the acidic material. In the contrary, the higher the temperature, the more rapid the nuetralization; so it is advantageous to prepare the detergent product having a small content of the acidic material. When the temperature exceeds 400 °C, the organic materials contained in the product are oxidized or carbonized; the performance of the product cannot be exhibited; and there is a risk on the fire or explosion due to a high temperature. The selection of the temperature may be dependent on the desired bulk density or composition of the product. The lower the temperature, the particles tend to be a stronger and to have a higher bulk density. When the temperature of the air is less than 0°C, the evaporation and neutralization reactions are not substantially made; it is difficult to use a partially neutralized surfactant precursor in the detergent product and to increase the content of the liquid material; the surface of the particle becomes smooth; and coating of the surface modifying agent is not possible. If the temperature is increased to a room temperature during storage of the product, the particle becomes sticky, and a lowering of the fluidity and a caking phenomenon take place. The temperature of the air refers to that measured in the outlet portion of the air lifter.

As the acidic materials which react with the alkali builder to produce a carbon dioxide and form a porous absorption structure, a partially-neutralized precursor of the surfactant generally used for detergent, e. g., alkylbenzene sulfonic acid, alkylether sulfonic acid, alpha olefine sulfonic acid, alkylsulfonic acid, fatty acid, citric acid, succinic acid or mixtures thereof, may be used. The alkali builder may include one or more selected from the group consisting of sodium carbonate (Na2C03), sodium bicarbonate (NaHC03), potassium carbonate (K2CO3), potassium bicarbonate (KHC03) and sodium sulfate (NazS04).

The acidic material and alkali builder are reacted due to a rotation of the agitating device and/or to a hot air of the air lifter, to form a carbon dioxide and water, with a absorbable porous structure being formed while blending with other materials, and a liquid material being absorbed.

The surface-modification is then carried out by the surface modifying agent included in the powder material or separately injected. These are exposed to the air under an appropriate temperature and a flow rate to evaporate a moisture occurred and adjust a effervescemt phenomenon.

When the mixer is positioned in the outlet portion of the air lifter, a separate surface modifying agent is injected in the same or lower position into which a detergent composition is injected. In case of the same position, it is preferable to inject the surface modifying agent together with the detergent. In case of the lower position, the surface modifying agent having a relatively low bulk density and a fine particle form rises by the air and then contacts the detergent composition lowering by a gravity, to thereby coat the surface and carry out a surface modification.

To increase a washing performance, a conventional surfactant or a surfactant solution for detergent may be used. For example, the powder or liquid components such as alpha-olefine sulfate, alkyl sulfate, alkyl benzene sulfate, alkylether sulfate, alkyl ethoxylate, alkyl polyglucoside, glucamide, amine oxide and the like may be used. These components are blended and absorbed into the absorbable porous structure formed by a effervescent reaction. By doing so, a surface modifying agent is coated. Further, conventional liquid or powder components for detergent, e. g., sodium silicate, polyacrylate, fluorescent whitening agent, etc., may be used. These materials improve a washing performance and the moisture contained in these matreials facilitates an acid-alkali effervescent reaction and is evaporated by the hot air. Particularly, when the liquid component to be absorbed is contained in a large amount, the detergent composition is prepared by a mixer mounted at the separate position. When the resulting composition is moved through a conventional velt-type conveyor velt, the liquid material is absorbed stably into the porous structure during drifting.

The surface modifying agent is selected from one or more selected from powder zeolite, talc, clay and silica, which are generally used for detergent. The surface modifying agent coats the surface of the particle to increase the fluidity and storage stability of the neutralized particle.

The surface modifying agent is injected and blended concurrently with the liquid and powder materials into the mixer or injected directly into the air lifter, to thereby coat the surface of the mixed detergent composition and inhibits the whole properties of the detergent powder such as fluidity or anti-caking property.

The laundry detergent composition prepared by the above mentioned processe may be prepared by adding one or more fluorescent brightening agent selected from the group consisting of aminostilbene, biphenyl, cumarine, pyrazoline and quinolone; and/or one or more enzymes selected from the group consisting of protease, amylase, lipase and celluase; and/or one or more anti-foaming agent selected from silicone or paraffin wax or additives such as perfumes, soil-redeposition inhibiting agents, fiber dye transfer inhibitors and the like.

The present invention will be explained in further detail by means of the following Examples and Comparative Example. However, it should be understood that the present invention is not limited to these examples in any manner.

Comparative Example 1 The bead powder detergent was prepared by spraying the detergent with the components and content shown in Table 1 in the downward from the upper part of a countercurrent spray dryer.

Table 1. Detergnet composition Content (wt. %) straight chain alkybenzene sodium 20 sulfate(C10-C14)1) alpha-olefine sodium sulfonate 10 fatty acid Na (Clo-Clx)) sodium carbonate (Na2CO3) 32.7 sodium silicate 7 sodium sulfate (Na2SO4) 3. 3 zeolite 20 fluorecent whitening agent4'0. 3 enzyme) anti-foaming 0.4 perfume0.3 1) prepared from petroleum based alkyl benzene 2) prepared from petroleum alphaolefine 3) prepared from natural fatty acid 4) Tinopal CBS-X (Ciba-Geigy, Swiss) 5) Savinase 12. OT (Novo Nordisk, Denmark) 6) LDC 1215 (DC Silicon, Korea) Example 1 The agitator having an agitating fan was mounted in the outlet portion of the air lifter which indrafts the air. The liquid material supplying device and the powder material supplying device were mountd with the agitator and/or the air lifter. The liquid material and the powder material were injected according to the composition shown in the following Table 2 and then blending or reaction/surface modification were carried out at the speed of 2000 rpm. The powder of the detergent composition was passed in 20 tons per hour in the opposite to the air drifting direction of the air lifter through which the air rate of 8m/sec and temperature of 120°C are passed, to thereby adjust the level of the neutralization and effervescent reactions. The moisture contained in the raw materials is evaporated to form a particle. The laundry powder detergents A-F are thus obtained.

The laundry powder detergent F was prepared by injecting 9.5 percent by weight of a surface modifying agent (50% of Zeolite) downward the inlet of the detergent composition prepared through the powder material supplying device equipped with the air lifter.

Table 2.

(unit: wt. %) Detergent composition A B C D E F polyoxyethylenealkyl ether"10 5 5 5 alkyl 10552acid2) polyoxyethylene alkyl ether 2510 sulfonic acid3) alpha olefin sulfonic acid4'5 2 alkyl ether sulfonic acid5) 10 4 2 alkyl benzen sulfonic acid6) 15 5 2 fatty acid') 5 1 12.1 4 2 alpha olefine sodium sulfate 3 (powder) citric acid 5 1 2 succinic acid 3 2 zeolite 28 15 20 20 19 talc 2 15 clay 5 15 18 silica 15 18 sodium carbonate (Na2CO3) 37 17 10 5 sodium bicarbonate (NaHC03) 8 5 potassium carbonate (K2CO3) 15 12 5 potassium bicarbonate (KHC03) 20 5 sodium sulfate (Na2SO4) 11 20 21 5.9 3 20 fluorecent whitening agent8) 0. 3 0.3 0.3 0.3 0.3 0.3 enzyme9) 1 1 1 1 1 anti-foaming agent"'0.4 0.4 0.4 0.4 0.4 0.4 perfume 0.3 0.3 0.3 0.3 0.3 0.3 Total 100 100 100 100 100 100 1) polyoxyethylenealkylether: carbon number of akyl group = 12-14, average addition mole number of ethylene oxide = 7 2) alkylsulfonic acid: carbon number of alkyl group = 12-14 3) polyoxyethyleneethersulfonic acid: carbon number of alkyl group = 12-14, average addition mole number of ethylene oxide = 3 4) alphaolefine sulfonic acid: carbon number of alkyl group = 12-18 5) alkylether sulfonic acid: carbon number of alkyl group = 12-16 6) alkylbenzene sulfonic acid: carbon number of alkyl group = 12-16 7) fatty acid: carbon number of alkyl group = 10-18 8) Tinopal CBS-X (Ciba-Geigy, Swiss) 9) Savinase 12. OT (Novo Nordisk, Denmark) 10) LDC 1215 (DC Silicon, Korea) Example 2 The liquid material and the powder material were injected according to the composition shown in Table 2 into the mixer mounted with the liquid material supplying device, the powder injecting device, and the agitator having an agitating fan. The blending or reaction/blending /surface modification were carried out at the speed of 2000 rpm. The powder of the detergent composition was passed in 20 tons per hour in the opposite to the air drifting direction of the air lifter through which the air rate of 8m/sec and temperature of 120°C are passed, to thereby control the level of the neutralization and effervescent reactions. The moisture contained in the raw materials is evaporated to form a particle. The laundry powder detergent G-L are thus obtained.

The laundry powder detergent F was prepared by injecting 9.5 percent by weight of a surface modifying agent (Zeolite) downward the inlet of the powder of the detergent composition prepared through the powder injecting device mounted with the air lifter.

The laundry powder detergent M was injected according to a composition D shown in Table 2 in the mixer mounted with the liquid material supplying device, the powder injecting device, and the agitator having an agitating fan. The blending or reaction/blending/surface modification were carried out at the speed of 2000 rpm. The powder of the detergent composition was passed 20 tons per hour in the opposite to the air drifting direction of the air lifter through which the air speed of 8m/sec and temperature of 120 C are passed, to thereby control the level of the neutralization and effervescent reactions.

Example 3 The agitator having an agitating fan was mounted in the outlet portion of the air lifter which indrafts an air. The liquid material supplying device and the powder injecting device were mounted with the agitator and/or the air lifter. The liquid material and the powder material were injected according to the composition A of Example 1 and then blending or reaction/surface modification were carried out at the speed of 2000 rpm. The powder of the detergent composition was passed in 20 tons per hour in the opposite to the air drifting direction of the air lifter through which the air speed and temperature as shown in Table 3 are passed, to thereby control the neutralization and effervescent reactions.

The moisture contained in the raw materials is evaporated to form a particle. The laundry powder detergent M-V were thus prepared.

Table 3. Temperatue (°C) Speed (m/sec) N 0 8 8O50 P 100 8 8Q250 R 400 8 Example 3 1S80 T 80 4 U 80 7 V 80 10 W 80 15 Experiment The high bulk density laundry powder detergent prepared from Examples 1 to 3 were tested under the following condition: (1) Washing performance The washing test of the laundry powder detergent prepared from Examples 1 and 2 were carried out and the results was shown in the following Table 4. washing apparatus: Terg-O-Tometer wasing temperature: 20°C hardness of water: 40ppm Ca++, 10 ppm Mg++ water ratio: 4.5g soiled swatch/I # soiled cloth: EMPA Art No. 101 (olive oil, carbon black/cotton) dosage of detergent: 0.67g/0.67g/ evaluation: the washing performance measured based on 100 for Comparative Example 1.

(2) bulk density The bulk density of the laundry powder detergent prepared from Examples 1 to 3 were measuered and the results are given in Table 4.

(3) Fluidity It is measured the time when 100ml of the laundry powder detergent prepared from Examples 1 to 3 is passed through a funnel with 10mm of bottom diameter. The results are given in Table 4.

(4) Solubility lOg of the laundry powder detergent prepared from Examples 1 to 3 is added to 1 Q of the ion exchanged water and agitated for 5 minutes.

The detergent solution is passed through 200 mesh of the standard net sieves and then the dry weight (%) of the residual material was measured.

The results are given in Table 4.

(5) Yield The yield of the laundry powder detergent prepared from Examples 1 to 3 was measured. The results are given in Table 4 below.

Table 4. Washing Bulk Sample fluidity (sec) solubility solubility power (%) density (g/cc) A 135 0. 80 20 99.5 98 B 107 0. 42 30 98.7 92 0.303197.893C143 Example 1 D 320.47 97 E 100 1.12 12 97.7 97 F 102 0. 96 15 98.6 89 G-0.83 25 99.7 98 H 0.47 30 95.6 95 I-0.35 32 98.7 99 Example 2 J 0. 57 27 99.4 94 K 1. 20 11 97.6 95 L - 1.03 12 98.7 92 M-0. 67 25 98.8 97 N-1. 18 11 99.3 99 O - 0.95 14 97.8 98 P-0. 83 19 98.7 98 Q-0. 54 27 96.5 94 0.303098.590R- Example 3 0.602498.293S- T-0. 65 22 99.3 95 U - 0.80 19 97.8 98 V - 0.97 13 96.9 97 W-1.16 10 99.7 98 Comparative 100 0. 45 33 94.1 83 Example 1 As shown in Table 4, it can be seen that the laundry powdery detergent prepared according to the present invention has excellent fluidity, solubility, yield and washing performance and further has a broad bulk density.