JP2008280473A - Silicone-containing particles - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a silicone-containing particle which releases quickly a silicone compound in water. <P>SOLUTION: The silicone-containing particle comprises (A) 100 pts.mass of the dimethylpolysiloxane and of one or more kinds of its derivatives with an HLB of 6 or less, (B) 5-100 pts.mass of a nonionic surfactant having a pour point of lower than 40°C, (C) 5-100 pts.mass of a surfactant exclusive of component (B), and (D) an oil-absorbent carrier. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a silicone-containing particle and a method for producing the same. The present invention also relates to a powder detergent composition containing the silicone-containing particles.

  Silicone compounds have high lubricity and are widely used for the purpose of improving the texture of textile products. In general, it is known that a silicone compound has a higher texture improvement effect as the degree of polymerization, that is, the viscosity becomes higher. Further, it is known that a silicone compound having a low water solubility is preferable from the viewpoint of adsorptivity to fibers and prevention of detachment during rinsing. Such a silicone compound having a high texture-improving effect is a high-viscosity liquid, and thus is widely applied to liquid compositions such as liquid detergents, but is generally applied to powder compositions such as powder detergents. Is not done.

  Although it would be desirable to improve the function of powder detergents if it can be applied to silicone compounds in powder detergents, when silicone compounds with high viscosity and low water solubility are incorporated into powder detergents, the silicone compounds are released quickly in water. In addition, it is required that the solubility after storage is maintained and that the silicone compound is highly blended in the silicone granulated product.

As a technique for powdering a silicone compound, techniques of Patent Documents 1 to 3 targeting a silicone compound as an antifoaming agent are known. Moreover, the technique of mix | blending a silicone compound as a self-emulsifiable composition and improving the dispersibility in water is also known (patent documents 4-5).
JP-A-3-186307 JP-A-7-70594 JP 2001-158900 A JP-A-53-34854 JP-A-56-129003

  However, conventional silicone compound pulverization techniques are mostly directed to silicone compounds as antifoaming agents having a relatively low viscosity, and powdery higher viscosity silicone compounds suitable for improving the texture of textile products. An appropriate method for this is not found in Patent Documents 1 to 3. Patent Documents 4 to 5 do not specifically refer to powdering a silicone compound, and powdering so that a high-viscosity silicone compound can be blended in a powder detergent or the like. It is not possible to obtain any knowledge about the rapid release in water and maintaining the solubility after storage.

  An object of the present invention is to provide silicone-containing particles that rapidly release a silicone compound in water and further maintain solubility after storage. In particular, it contains a high-viscosity and low water-soluble silicone compound suitable for improving the texture of textile products, releases the silicone compound quickly in water, and maintains solubility after storage. It is to provide silicone-containing particles having a high content. Furthermore, it is providing the manufacturing method which can manufacture such a silicone containing particle | grain easily.

  The present invention relates to (B) nonionic surfactant 5-100 having a pour point of less than 40 ° C. with respect to 100 parts by mass of (A) dimethylpolysiloxane having an HLB of 6 or less and one or more of its derivatives. The present invention relates to a silicone-containing particle comprising 5 parts by mass of a surfactant having a pour point of 40 ° C. or higher, and (D) an oil-absorbing carrier other than parts by mass and components (C) and (B).

  The present invention also relates to a powder detergent composition containing 0.2 to 20% by mass of the silicone-containing particles of the present invention.

  In addition, the present invention provides (B) a pour point of 40 with respect to 100 parts by mass of one or more of (A) dimethylpolysiloxane having an HLB of 6 or less and derivatives thereof (hereinafter referred to as component (A)). Particles 5 containing 5 to 100 parts by mass of a nonionic surfactant (hereinafter referred to as “component (B)”) having a temperature below 5 ° C. and a surfactant other than (C) and (B) components (hereinafter referred to as “component (C)”) Add (E) binder (hereinafter referred to as component (E)) to a mixture of ~ 100 parts by mass (as the amount of the surfactant) and (D) oil-absorbent carrier (hereinafter referred to as component (D)). The present invention relates to a method for producing silicone-containing particles by extrusion granulation.

  According to the present invention, silicone-containing particles that rapidly release a silicone compound in water and have excellent solubility after storage can be obtained. In particular, the present invention contains a high-viscosity and low-water-soluble silicone compound suitable for improving the texture of textile products, releases the silicone compound quickly in water, and has excellent solubility after storage. Silicone-containing particles having a high silicone compound content are provided. Moreover, such a silicone-containing particle of the present invention can be easily produced by the production method of the present invention.

[Silicone-containing particles]
<(A) component>

The component (A) is selected from one or more of dimethylpolysiloxane having an HLB of 6 or less and derivatives thereof. The measuring method of HLB is shown below.

* Measurement method of HLB HLB is computable from the cloudiness number A measured by the following method described in page 324 of surfactant manual (edited by Nishi-Ichiro et al., Sangyo Tosho Co., Ltd., published in 1960).
<Measurement method of HLB>
Dissolve 0.5 g of an evaluation sample (silicone) in 5 ml of 98% ethyl alcohol and titrate with a 2% aqueous phenol solution while stirring at 25 ° C., and the end point is when the liquid becomes turbid. The number of ml of 2% phenol aqueous solution required for this titration is defined as the cloud number A. HLB is calculated from the following equation.
HLB value = 0.89 × A + 1.11

  (A) HLB of a component is 6 or less, Preferably it is 4 or less, More preferably, it is 2 or less from the point of the adsorptivity to a fiber and the fall prevention at the time of a rinse.

  Among the components (A), dimethylpolysiloxane derivatives include alkyl-modified silicones, aralkyl-modified silicones, polyether-modified silicones (other than the component (B)), fatty acid ester-modified silicones, fluoroalkyl-modified silicones, amino-modified silicones. , Modified silicones such as epoxy-modified silicone, carboxyl-modified silicone, methacryl-modified silicone, alcohol-modified silicone, mercapto-modified silicone, and vinyl-modified silicone.

  The component (A) has a viscosity (25 ° C.) of 2000 mPa · s or more, more preferably 5000 mPa · s or more, and particularly preferably 10,000 mPa · s or more from the viewpoint of improving the texture to the textile product.

  The viscosity can be measured using a B-type viscometer (for example, DVM-B type manufactured by TOKYO KEIKI) by appropriately selecting the rotor and the number of rotations.

<(B) component>
(B) As the nonionic surfactant having a pour point of less than 40 ° C., polyoxyalkylene alkyl ether, polyoxyalkylene alkyl phenyl ether, alkyl polyglycoside, polyoxyalkylene sorbitan fatty acid ester, polyoxyalkylene fatty acid ester, Examples include polyoxyethylene / polyoxypropylene block polymers, polyoxyalkylenalalkylol (fatty acid) amides, and the like.

  Of the nonionic surfactants, polyoxyalkylene alkyl ethers obtained by adding an average of 2 to 20 moles and further 3 to 16 moles of an alkylene oxide to an alcohol having 10 to 16 carbon atoms are preferable. Examples of the alkylene oxide include ethylene oxide and propylene oxide.

  The pour point of the component (B) is measured according to the method described in “Minimum pour point test method” of JIS K 2269 (1987). That is, after heating and melting, measurement is performed according to the description conditions.

  (B) A component is 5-100 mass parts with respect to 100 mass parts of (A) component, Preferably it is 10-80 mass parts, More preferably, it is used in the ratio of 15-50 mass parts.

<(C) component>
Surfactants other than the component (B) of the component (C) include surfactants having no pour point or a pour point of 40 ° C. or higher due to the relationship with the component (B). For example, anionic surfactants, nonionic surfactants, cationic surfactants, amphoteric surfactants, particles composed of these surfactants, particles containing these surfactants, for example, containing 50% by mass or more Can also be used. Specifically, sodium laurate powder, linear alkyl (carbon number 8-14) sodium benzenesulfonate powder, alkyl (carbon number 12-18) sodium sulfate powder, polyoxyethylene alkyl ether sodium sulfate powder (alkyl group carbon) Number 12-18, average EO addition mole number 0.2-3), α-olefin (carbon number 12-18) sodium sulfonate powder, fatty acid (carbon number 14-18) diethanolamide powder, and further known pulverization / Examples thereof include powders containing 50% by mass or more of an active agent produced using a granulation method (in the case of granules, pulverized if necessary), among which sodium alkyl sulfate powder is more preferable.

  The component (C) is preferably a surfactant that has a higher pour point than the component (B) or does not have a pour point due to thermal decomposition. Preferably, when it has a pour point, 60 ° C. or higher is preferable. Here, the pour point of the component (C) refers to a value measured in accordance with the method of JIS K 2269, similarly to the component (B).

  Since the component (C) and the component (B) are separated at a pour point of 40 ° C., those that flow at room temperature and those that do not coexist contribute to both solubility and structural stability.

  When the shape of the component (C) is in the form of particles (including powders, granules, granules, etc.), the average particle size is preferably in the range of 1 to 50 μm from the viewpoint of dispersibility and solubility expression effect. The range of 40 μm is more preferable, and the range of 5 to 30 μm is still more preferable. The measurement method of the average particle diameter of (C) component can be measured using the laser diffraction type particle size distribution measuring apparatus with which the dry unit was equipped.

  (C) component is 5-100 mass parts with respect to 100 mass parts of (A) component, Preferably it is 10-80 mass parts, More preferably, it is used in the ratio of 20-70 mass parts. Also when using the particle | grains containing (C) component, it is preferable to use the said particle | grain so that it may become this ratio in conversion of the pure part of (C) component.

<(D) component>
Examples of the oil-absorbing carrier (D) include silicates and aluminosilicates. Specific examples of silicates and aluminosilicates include amorphous silicate ("Tokusil NR" manufactured by Tokuyama Corporation), bentonite ("Laundrosil EXM0242" manufactured by Sud Chemie), calcium silicate ("Flolite" manufactured by Tokuyama Corporation) ), Aluminum silicate (“TIXOLEX 25” manufactured by Masatomo Chemical), among which amorphous silicate and calcium silicate are more preferable. Product names are shown in angle brackets.

  (D) component is 5-200 mass parts with respect to 100 mass parts of (A) component, Preferably it is 20-150 mass parts, More preferably, it is used in the ratio of 40-120 mass parts.

<(E) component>
The silicone-containing particles of the present invention preferably further contain a binder as the component (E). It is preferable to obtain the silicone-containing particles of the present invention by extrusion granulation using a binder. Examples of the binder of component (E) include thermoplastic water-soluble binders, and one or more selected from the group consisting of polyethylene glycol, polypropylene glycol, polyoxyethylene alkyl ether, polyoxyethylene phenyl ether, and the like. preferable. In the present invention, a water-soluble binder having a melting point or softening point of 35 to 80 ° C. is preferably used, preferably 45 to 70 ° C., particularly preferably 50 to 65 ° C.

  The weight average molecular weight of the binder is preferably 4000 to 20000, more preferably 6000 to 13000, and particularly preferably 7000 to 9000 in terms of viscosity when granulated by GPC method using polystyrene as a standard.

  The component (E) is preferably used in a proportion of 10 to 300 parts by mass, more preferably 30 to 200 parts by mass, and particularly 50 to 150 parts by mass with respect to 100 parts by mass of (A).

<(F) component>
The silicone-containing particles of the present invention preferably further contain a polyoxyethylene-polyoxypropylene-modified silicone having an HLB greater than 6 as the component (F). (F) As a component, the compound represented by the following general formula (F-1) is preferable.

[Wherein, R is an alkylene group having 1 to 10 carbon atoms, preferably 2 to 5 carbon atoms, R ′ is a hydroxyl group or an alkyl group or alkoxy group having 1 to 6 carbon atoms, n / (m + n) is 0.04 or more, a / B is 0.7 to 1.3. ]

In the formula, n / (m + n) is preferably 0.05 or more, more preferably 0.06 or more, and a / b is preferably 0.8 to 1.2, more preferably 0.9 to 1.1. The arrangement of C ₂ H ₄ O and C ₃ H ₆ O may be either block or random.

  The component (F) has a viscosity (25 ° C.) of less than 10,000 mPa · s, more preferably 8000 mPa · s or less, and particularly preferably 5000 mPa · s or less from the viewpoint of handling properties. Further, the HLB (measurement method: described in the column of the component (A)) of the component (F) is larger than 6, and more preferably 7 or more. The structure of the compound represented by the general formula (F-1) is preferably selected so as to have this viscosity and HLB.

  The value of m, n, a, b of (F) component can be calculated by NMR measurement.

  The component (F) is preferably 0.1 to 10 parts by mass, more preferably 0.2 to 8 parts by mass, and still more preferably 0.5 to 5 parts by mass with respect to 100 parts by mass of the component (A). Used in

  The component (A), the component (B), and the component (F) are preferably mixed in advance and mixed with the component (D) or the like as a mixed solution.

  The mass ratio of the component (F) to the component (B) is (F) / (B), and is 1/2 to 1/100, more preferably 1/5 to 1/50. This is preferable.

  Furthermore, the mass ratio of the component (A), the component (F), and the component (B) is [(F) + (B)] / (A), 10/1 to 1/10, and further 5/1 to 1/5 is preferable from the viewpoint of the balance of the finishing properties of the fibers.

<Other optional components>
Moreover, sugar and polysaccharide are mentioned as an arbitrary component. Specific examples include cellulose, starch, and derivatives thereof. Specific examples of cellulose and its derivatives include powdered cellulose (“ARBOCEL series” manufactured by Toa Kasei Co., Ltd.), carboxymethylcellulose (“Sunrose” manufactured by Nippon Paper Chemicals Co., Ltd.), and methylcellulose (manufactured by Shin-Etsu Chemical Co., Ltd.). "Metros"), hydroxypropylmethylcellulose ("Marporose" manufactured by Matsumoto Yushi Seiyaku Co., Ltd.), cationized cellulose ("Poise 60H" manufactured by Kao Corporation, "JR30M", "LR400" manufactured by Dow Chemical), and hydroxyethylcellulose May be derivatives that have been hydrophobized with an alkyl group, a polyoxyethylene alkyl group, and a glycidyl ether group. Of these, hydrophobized modified hydroxyethyl cellulose is more preferred from the viewpoint of promoting adsorption of silicone to fibers.

Specific examples of starch include dextrin ("Pine Flow KH" manufactured by Matsutani Chemical Industry Co., Ltd.), dextrin ("Paindex" manufactured by Matsutani Chemical Industry Co., Ltd.), cationized starch ("Matsuya Chemical Industry Co., Ltd." Positive parin "). Of these, dextrins are more preferred, those having a specific volume of 5 to 10 m ² / g are more preferred from the viewpoint of oil absorption, and those having a glass transition temperature of 200 ° C. or more from the viewpoint of stability at high temperatures. Particularly preferred.

  Also, sulfates, carbonates, bicarbonates, sesquicarbonates, and phosphates can be used. Furthermore, particles obtained by spray-drying a surfactant or a builder component, particles obtained by mixing and granulating a plurality of detergent components, and the like may be used as optional components.

  The mass ratio of the component (A), the component (B), the component (C), and the component (D) is 5/1 to 1/5 as [(A) + (B) + (C)] / (D). Further, 5 / 1.5 to 1/4, and more preferably 5/2 to 1/3 is preferable from the viewpoint of granulation suitability.

  In this invention, the temperature at the time of mixing (A) component, (B) component, (C) component, and (D) component is 40-160 degreeC, Furthermore, 50-120 degreeC, Furthermore, 55-100 degreeC is preferable.

  In addition to the above components, the silicone-containing particles of the present invention can contain pigments (dyes, pigments), fragrances, soil release agents, recontamination inhibitors, bleaches, bleach activators, antibacterial agents, enzymes, and the like. .

  The preferable content of each component in the final silicone-containing particles of the present invention is (A) component 15 to 60% by mass, further 20 to 50% by mass, (B) component 1 to 30% by mass, and further 5 to 5%. 20% by mass, component (C) 1-30% by mass, further 5-20% by mass, component (D) 15-60% by mass, further 20-50% by mass, component (E) 15-50% by mass Furthermore, 20-40 mass%, (F) component is 0.05-10 mass%, Furthermore, 0.1-5 mass%.

[Method for producing silicone-containing particles]
The silicone-containing particles of the present invention are produced by mixing (B) component 5 to 100 parts by mass, (C) component 5 to 100 parts by mass, and (D) component with respect to (A) component 100 parts by mass. it can. In that case, the temperature at the time of mixing is 40-160 degreeC, Furthermore, 50-120 degreeC, Furthermore, 55-100 degreeC is preferable. In the present invention, it is preferable that the component (D) is further mixed with the mixture of the components (A), (B), and (F), and the mixture (A) to (D) is mixed with the component (E). It is further preferable to produce the silicone-containing particles of the present invention by adding and mixing appropriately and compacting by extrusion granulation. By using a manufacturing method in which extrusion granulation and consolidation are used, there is an advantage that stability during transportation and storage is enhanced.

  In the case of extrusion granulation, for example, each component is sufficiently premixed in advance using a known mixer such as a Henschel mixer, a high-speed mixer, or a nauter mixer, and then the resulting mixture is mixed with pelleter double (Fujitsu It can be obtained by extrusion granulation with a known extruder such as Powdal Co., Ltd. or Twin Dome Gran (Fuji Paudal Co., Ltd.). Further, a kneading and extruding apparatus such as Extrude Ohmics (manufactured by Hosokawa Micron Co., Ltd.) can also be used. In this case, the above-mentioned premixing can be omitted.

  The short axis particle diameter of the silicone-containing particles obtained through extrusion granulation is preferably 0.3 to 2.5 mm, more preferably 0.5 to 2.0 mm, still more preferably about 0.7 to 1.0 mm. And can be extruded in the form of a cylindrical or noodle-shaped granulated product.

  The silicone-containing particles obtained as described above may be pulverized or sized by a known method and apparatus. The equipment used when pulverizing or sizing is not particularly limited, and a known pulverizer (or pulverizer) can be used. For example, high-speed mixer (Fukae Kogyo Co., Ltd.), Malmerizer, Fitzmill (Dalton Co., Ltd.), Power Mill (Paurec Co., Ltd.), Comil (Quadro Co.), etc. From the viewpoint of the amount of fine powder generated that affects the properties and productivity, it is preferable to use a pulverizer such as a power mill using a knife cutter or a comil that pulverizes particles by pressing the impeller and screen.

  Examples of the power mill include an apparatus disclosed in Japanese Patent Laid-Open No. 5-96195. This device is a device with a cutter blade and a cylindrical screen. Particles thrown into the power mill inlet fall freely inside the power mill, and are crushed and adjusted by a pulverizing blade disposed on the cutter blade during this natural fall. Be grained.

  Examples of the comil include an apparatus disclosed in US Pat. No. 4,759,507. This device is an instrument having an impeller and a screen, and particles thrown into the comil inlet are pressed against the screen by the centrifugal force generated by the rotating impeller. The small particles are instantaneously and also lifted by the swirl generated due to the conical shape, and the particles that have risen are pulverized and sized by the impeller.

  The degree of pulverization of the obtained silicone-containing particles is determined while evaluating the long axis particle diameter and short axis particle diameter by, for example, an image analysis method as described in JP-A-2003-130785. To do. If the pulverization conditions are determined, silicone-containing particles having a desired shape can be produced with good reproducibility for the same extruded granulated product.

[Powder detergent composition]
The silicone-containing particles of the present invention can be applied to various products for the purpose of treating textile products. Among these, it is preferably blended in a powder detergent composition. The powder detergent composition preferably contains 0.2 to 20 mass%, more preferably 0.5 to 10 mass%, and 1 to 5 mass% of the silicone-containing particles of the present invention. As the components other than the silicone-containing particles of the present invention, those known as components of powder detergent compositions for textile products can be used.

[1] Preparation of silicone mixture As component (A), dimethyl silicone (manufactured by Shin-Etsu Chemical Co., Ltd., “KF 96-30,000 cs”, HLB 1.1, viscosity (25 ° C.) 29200 mPa · s), component (B) A nonionic surfactant (“Emulgen 106”, pour point 8 ° C., manufactured by Kao Corporation) was used. As the polyether-modified silicone of component (F), the following (manufactured by Toray Dow Corning) was used.
Polyether-modified silicone: “SH-8700” (viscosity (25 ° C.) 1440 mPa · s, HLB 7.8, a / b = 1.04 in general formula (F-1))

[2] Preparation and Evaluation of Silicone-Containing Particles (2-1) Preparation of Silicone-Containing Particles According to the ratio shown in Table 1, silicone mixture, dextrin ["Pine Flow KH", manufactured by Matsutani Chemical Co., Ltd.], silicon dioxide [" Toxeal NR ", manufactured by Tokuyama Corporation], calcium silicate [" Fluorite R ", manufactured by Tokuyama Corporation], sodium alkyl sulfate [" Emar 10P "(Kao Corporation), pour point: decomposed by overheating , Active agent granule pulverized product (pulverized particles of Example 5 of JP-A-2005-68413, pour point: unmeasurable because of decomposition due to overheating), powdered cellulose [Toa Kasei Co., Ltd. "ARBOCEL BE600-30"], sodium sulfate ["Neutral anhydrous sodium sulfate", manufactured by Shikoku Kasei Co., Ltd.], hydrophobized hydroxyethyl cellulose [International Publication WO00 / 73 Charge of 51 No. identical] Present compound 8 in Nauta mixer [manufactured by Hosokawa Micron Co.] Ltd.), the temperature was raised by mixing with a jacket temperature of 75 ° C.. Next, when the temperature of the powder reached 60 ° C., polyethylene glycol (“KPEG6000LA” manufactured by Kao Co., Ltd.) previously melted was added and further mixed, and then the mixture was extracted. Next, the obtained mixture was extruded through a screen having a pore diameter of 0.7 mm by using an extrusion granulator ["Peletter Double EDX-60 type", manufactured by Fuji Powder Co., Ltd.] and consolidated. Further, after the extruded granulated product was cooled, it was pulverized by a granulator (pulverized once by a power mill), and passed through a sieve to remove particles having a particle size of 355 μm or less to obtain silicone-containing particles.

(2-2) Method for measuring silicone elution from silicone-containing particles (2-2-1) Initial elution rate 1 L beaker was charged with 1 L of distilled water at 20 ° C. and a stir bar, and stirred while stirring with a stirrer. Immediately after adding about 0.1 g of silicone-containing particles, 7 minutes later, filtration was performed under reduced pressure using filter paper (grade: 5C, manufactured by ADVANTEC). After the filter paper was dried, the filter paper was immersed in chloroform, and ultrasonic waves were applied for 10 minutes to elute the silicone into chloroform. After removing the filter paper, chloroform was removed, deuterated chloroform was added, NMR measurement was performed, and the amount of silicone was measured. The silicone elution rate was measured by the following formula. The results are shown in Table 1.
Silicone elution rate (%) = [1-C / (A × B / 100)] × 100
A: Mass of charged silicone-containing particles (g)
B: Ratio (%) of silicone contained in the silicone-containing particles subjected to the test
C: Mass of silicone remaining on filter paper calculated by NMR measurement (g)

(2-2-2) Elution rate after storage About 40 g of silicone-containing particles were put into a screw tube having a capacity of 100 ml, and stored in an electric dryer at 40 ° C. for 60 days in a sealed state. The silicone elution rate of the silicone-containing particles after storage was measured in the same manner as described above. The results are shown in Table 1.

  In addition, 4 mass% of the silicone-containing particles of Examples 1 to 4 are added to the powder detergent composition described in Example 3 of Japanese Patent No. 312757, and a fully automatic washing machine (NA-F60E manufactured by Matsushita Electric Industrial Co., Ltd.). As a result of washing on the standard course, the finish was better than when no silicone-containing particles were added.

Claims (8)

(A) 5 or 100 parts by mass of a nonionic surfactant having a pour point of less than 40 ° C. with respect to 100 parts by mass of one or more dimethylpolysiloxanes and derivatives thereof having an HLB of 6 or less, and (C) Silicone-containing particles comprising 5 to 100 parts by mass of a surfactant other than the component (B) and (D) an oil-absorbing carrier. The silicone-containing particles according to claim 1, further comprising (E) a binder. The silicone-containing particles according to claim 1 or 2, further comprising (F) a polyoxyethylene-polyoxypropylene-modified silicone having an HLB of greater than 6. The silicone-containing particles according to any one of claims 1 to 3, wherein the component (A) has a viscosity (25 ° C) of 2000 mPa · s or more. (A) The compounding quantity of a component is 15-60 mass%, The silicone containing particle in any one of Claims 1-4. (F) A component is a compound represented by the following general formula (F-1), The silicone containing particle in any one of Claims 1-5.

[Wherein, R represents an alkylene group having 1 to 10 carbon atoms, R ′ represents a hydroxyl group or an alkyl group or alkoxy group having 1 to 6 carbon atoms, n / (m + n) is 0.04 or more, and a / b is 0.7 ~ 1.3. ] A powder detergent composition containing 0.2 to 20% by mass of the silicone-containing particles according to any one of claims 1 to 6. (A) 5 or 100 parts by mass of a nonionic surfactant having a pour point of less than 40 ° C. with respect to 100 parts by mass of one or more dimethylpolysiloxanes and derivatives thereof having an HLB of 6 or less, and (E) Binder is added to the mixture of 5 to 100 parts by mass of particles containing a surfactant other than the component (B) (as the amount of the surfactant) and (D) the oil-absorbing carrier, and extruded. A method for producing silicone-containing particles, which is granulated.