JP4219510B2

JP4219510B2 - Method for producing high bulk density detergent particles

Info

Publication number: JP4219510B2
Application number: JP33436599A
Authority: JP
Inventors: 裕史坂田; 弘西村
Original assignee: Kao Corp
Current assignee: Kao Corp
Priority date: 1999-11-25
Filing date: 1999-11-25
Publication date: 2009-02-04
Anticipated expiration: 2019-11-25
Also published as: JP2001152196A

Description

【０００１】
【発明の属する技術分野】
本発明は高嵩密度洗剤粒子群の製造方法に関する。
【０００２】
【従来の技術】
粒状洗剤組成物は、消費者の利便性より、高嵩密度化や低使用量化が強く指向されている。そのような高嵩密度洗剤は従来から知られている噴霧乾燥法でも製造できるが、この方法は多大なエネルギー及びスペースを必要とするため、他の方法が注目されている。
【０００３】
陰イオン界面活性剤の酸前駆体を固体アルカリ無機材料で中和することを含む製造方法は、その中で特に重要なものの一つである。すなわち、陰イオン界面活性剤の酸前駆体（水分１％以下）を出発原料にして固体アルカリ無機材料で中和する高嵩密度洗剤の製造方法は、現在の洗剤製法の主流である界面活性剤の水性スラリー（水分３０〜７０％）を出発原料として噴霧乾燥する製法のように、大規模な噴霧乾燥装置を必要としないので、設備コストが低く、しかも省エネルギーという利点を有する。
【０００４】
例えば、特開昭６０−７２９９９号公報には、洗浄作用成分たるスルホン酸と炭酸ナトリウムと水とを強力な剪断装置で混合し、得られた固体物質を４０℃以下に冷却してから微粉砕し、得られた微粉を粒状化する方法が開示されている。この方法では、中和反応生成物が団子状となり、中和反応を生起させるのに必要な極めて大きいエネルギーを供給できるニーダーのような混練装置を必要とする。また、特表平７−５０３７５０号公報、特開平１０−１５２７００号公報には、陰イオン界面活性剤の酸前駆体を小粒径の粒状中和剤によって中和し、洗剤粒子を製造する方法が開示されている。しかしながら、この方法では、高剪断ミキサーを用いなければ均質な中和物は得られない。
【０００５】
【発明が解決しようとする課題】
本発明の課題は、高嵩密度の洗剤粒子の製造方法において、生産時のエネルギーコストの低減、生産設備の簡素化が達成でき、且つ溶解性に優れた高嵩密度洗剤粒子が得られる製造方法を提供することである。
【０００６】
【課題を解決するための手段】
本発明は、アルカリ剤を含む平均粒径６０〜２００μｍの粉体（Ａ）と、陰イオン界面活性剤の酸前駆体（Ｂ）とを混合し中和する工程を有する、嵩密度６００〜１２００ｇ／Ｌ、平均粒径２５０〜８００μｍの高嵩密度洗剤粒子群の製造方法、該製造方法により得られた高嵩密度洗剤粒子群、及び該高嵩密度洗剤粒子群を含有する洗剤組成物に関する。
【０００７】
【発明の実施の形態】
粉体（Ａ）は、炭酸塩２５〜１００重量％、特に３０〜１００重量％、リン酸塩０〜７５重量％、特に０〜７０重量％、蛍光染料０〜５重量％、特に０〜１重量％、アルカリ金属アルミノケイ酸塩０〜１０重量％、特に０〜５重量％を含有するのが好ましい。
【０００８】
粉体（Ａ）は、平均粒径６０〜２００μｍ、好ましくは７０〜１５０μｍ、より好ましくは８０〜１００μｍである。この平均粒径は、ＪＩＳＺ８８０１の標準篩（目開き４４、６２、８８、１２５、１７７、２５０、３５０、５００、７１０、１０００、１４１０、２０００μｍ）を用いて、ロータップマシーン（ＨＥＩＫＯＳＥＩＳＡＫＵＳＨＯ製、タッピング１５６回／分、ローリング２９０回／分）で１００ｇの試料を５分間振動させた後、篩目のサイズによる重量分率から求めたものである。また、粉体（Ａ）の粒度分布は、目開き８８μｍの篩通過品が３５％以上、特に４０％以上、目開き１２５μｍの篩通過品が７５％以上、特に８１％以上、目開き１７７μｍの篩通過品が９０％以上、特に９４％以上、目開きの篩２５０μｍ通過品が９５％以上、好ましくは９７％以上が好ましい。本発明では、適度な平均粒径の粉体（Ａ）で中和することにより、低エネルギーで均質な中和物が得られる。
【０００９】
陰イオン界面活性剤の酸前駆体（Ｂ）としては、高級アルコールの硫酸エステル、高級アルコールのエトキシル化物の硫酸エステル、アルキルベンゼンスルホン酸、パラフィンスルホン酸、α−オレフィンスルホン酸、α−スルホ脂肪酸若しくはそのエステル、脂肪酸が挙げられる。特に、アルキル鎖の炭素数が１０〜１８、好ましくは１２〜１４の直鎖アルキルベンゼンスルホン酸、炭素数が１０〜２０のα−スルホ脂肪酸アルキルエステルが好ましい。
【００１０】
本発明では、粉体（Ａ）を最終洗剤粒子群の１０〜５０重量％、特に２５〜５０重量％、前駆体（Ｂ）を最終洗剤粒子群の５〜４０重量％、特に１５〜３５重量％、粉体（Ａ）／前駆体（Ｂ）重量比が１０／１〜１／２、特に５／１〜１／１となるように用いるのが好ましい。
【００１１】
粉体（Ａ）と前駆体（Ｂ）とを混合し中和する工程は公知の方法に準じて行えばよい。例えば特表平７−５０３７５０号公報、特開平１０−１５２７００号公報記載の方法を参考にできる。また、粉体（Ａ）と前駆体（Ｂ）の比率も用途等を考慮して適宜決めればよい。
【００１２】
得られた高嵩密度洗剤粒子群は嵩密度５００〜１２００ｇ／Ｌ、好ましくは６００〜１０００ｇ／Ｌ、より好ましくは７００〜９００ｇ／Ｌであり、平均粒径１５０〜８００μｍ、好ましくは２５０〜６５０μｍである。この嵩密度は、ＪＩＳＫ３３６２の方法で測定したものである。平均粒径は前記同様に測定したものである。
【００１３】
本発明の高嵩密度洗剤粒子群は、そのまま洗剤組成物として用いてもよいし、更に他の成分、例えば酵素、香料、アルミノ珪酸塩等を加えて洗剤組成物を得ても良い。
【００１４】
【実施例】
実施例１
表１に示す実施例１の成分のうち、トリポリリン酸ナトリウム（ＳＴＰＰ）、炭酸ナトリウム、亜硫酸ナトリウム、蛍光染料を、レディゲミキサーＦＫＭ−１３０Ｄ（（株）マツボー製）を用いて攪拌羽根を周速３．４ｍ／ｓ、剪断機周速２７ｍ／ｓで１分間混合した。該混合物を粉体（Ａ）として用いる。
【００１５】
次に同条件でミキサーを作動させながら、直鎖アルキル（炭素数１２〜１４）ベンゼンスルホン酸（含水率０．５％）と硫酸の混合物を４分間で加え、更に５分間作動させて中和反応を行った。中和反応中、ミキサーのジャケットに２５℃水を通して冷却した。最後の５分間は、ミキサー内部に空気を流入させた。同条件でミキサーを作動させながら、牛脂脂肪酸を１分間で加え、更に５分間作動させて中和反応を行った。中和反応中、ミキサーのジャケットに２５℃水を通して冷却し、ミキサー内部に空気を流入させた。
【００１６】
次に同条件でミキサーを作動させながら、非イオン界面活性剤、ポリエチレングリコール（ＰＥＧ１３０００）、アクリル酸マレイン酸コポリマー（ＡＡ／ＭＡコポリマー）４０重量％水溶液を１分間で加え、更に２分間作動させて造粒を行った。続いてゼオライトの１３重量％分を加え、更に２分間作動させて表面改質処理を行い、２０００μｍの篩を通過させ、高嵩密度洗剤粒子群を得た。
【００１７】
更に回転ドラムを用いて、前記洗剤粒子群に残りのゼオライト、酵素、香料を加え、混合して、表１に示す最終組成の洗剤組成物３５ｋｇを得た。
【００１８】
実施例２
表１に示す実施例２の成分のうち、炭酸ナトリウム、亜硫酸ナトリウム、蛍光染料を、レディゲミキサーＦＫＭ−１３０Ｄ（（株）マツボー製）を用いて攪拌羽根を周速３．４ｍ／ｓ、剪断機周速２７ｍ／ｓで１分間混合した。該混合物を粉体（Ａ）として用いる。
【００１９】
次に、同条件でミキサーを作動させながら、直鎖アルキル（炭素数１２〜１４）ベンゼンスルホン酸（含水率０．５％）と硫酸の混合物を４分間で加え、更に５分間作動させて中和反応を行った。中和反応中、ミキサーのジャケットに２５℃の水を通して冷却した。最後の５分間は、ミキサー内部に空気を流入させた。
【００２０】
次いで、同条件でミキサーを作動させながら、非イオン界面活性剤、ゼオライトの１５重量％分を加え、２分間作動させて造粒を行った。次に、同条件でミキサーを作動させながら、ゼオライトを洗剤組成物の７重量％分を加え、ポリエチレングリコール（ＰＥＧ１３０００）、アクリル酸マレイン酸コポリマー（ＡＡ／ＭＡコポリマー）４０重量％水溶液を１分間で加え、更に２分間作動させて造粒を行った。続いてゼオライトの５重量％分を加え、更に２分間作動させて表面改質処理を行い、２０００μｍの篩を通過させ、高嵩密度洗剤粒子群を得た。
【００２１】
更に回転ドラムを用いて、前記洗剤粒子群に残りのゼオライト、酵素、香料を加え、混合して、表１に示す最終組成の洗剤組成物３５ｋｇを得た。
比較例１
粉体（Ａ）を更に粉砕機で微粉砕した以外は、実施例１と同様にして高嵩密度洗剤粒子群及び洗剤組成物を得た。同一条件では、中和が不完全で均質にはならなかった。
【００２２】
【表１】

【００２３】
ここで、ＬＡＳ−Ｎａは直鎖アルキル（炭素数１２〜１４）ベンゼンスルホン酸ナトリウムである。非イオン界面活性剤はアルキル基の炭素数が１２〜１４でＥＯ平均付加モル数が７であるポリオキシエチレンアルキルエーテルである。ＡＡ／ＭＡコポリマーはアクリル酸−マレイン酸コポリマーはナトリウム塩（７０モル％中和）であり、モノマー比はアクリル酸／マレイン酸＝３／７（モル比）、平均分子量７００００である。蛍光染料はチノパールＣＢＳ−ＸとチノパールＡＭＳ−ＧＸ（チバスペシャリティケミカルス社製）の重量比１／１混合物を用いた。ゼオライトとしては４Ａ型ゼオライト、平均粒径３μｍ（東ソー（株）製）を用いた。酵素は、セルラーゼＫ（特開昭６３−２６４６９９号公報記載のもの）とリポラーゼ１００Ｔ（ノボ社製）とを３：１の重量比で混合したものを用いた。
【００２４】
＜性能評価＞
実施例及び比較例で得られた高嵩密度洗剤粒子群及び洗剤組成物について、以下の評価を行った。結果を表２に示す。
【００２５】
〔平均粒径〕
ＪＩＳＺ８８０１の標準篩（目開き１２５、１７７、２５０、３５０、５００、７１０、１０００、１４１０、２０００μｍ）を用いて、ロータップマシーン（ＨＥＩＫＯＳＥＩＳＡＫＵＳＨＯ製、タッピング１５６回／分、ローリング２９０回／分）で１００ｇの試料を５分間振動させた後、篩目のサイズによる重量分率からメジアン径を算出した。
【００２６】
〔嵩密度〕
ＪＩＳＫ３３６２により規定された方法で測定した。
【００２７】
〔洗浄力の測定方法〕
まず、特開平１０−１６８４８５号公報第１４欄第６行に記載の方法に従い、人工汚染布を調製した。次いで、評価用洗剤水溶液１Ｌに１０ｃｍ×１０ｃｍの人工汚染布を５枚入れ、ターゴトメータにて１００ｒｐｍで洗浄した（洗浄条件：洗浄時間５分間、洗浄剤濃度０．０６６７重量％、水の硬度４°ＤＨ、水温２０℃、水道水にてすすぎ５分間。）。洗浄力は汚染前の原布及び洗浄前後の汚染布の５５０ｎｍにおける反射率を自記色彩計（島津製作所製）にて測定し、次式によって洗浄率（％）を求め、５枚の測定平均値を求めた。
【００２８】
【数１】

【００２９】

【００３０】
〔洗剤の溶解性〕
松下電器産業製洗濯機「愛妻号ＮＡ−Ｆ７０ＶＰ１」の洗濯槽側面部に、洗濯ネット（型番：ＡＸＷ２２Ａ―５ＲＵ０、目開き：３００×６４０μｍ）を装着した。次いで、衣料３ｋｇ（木綿肌着５０重量％、ポリエステル／綿混Ｙシャツ５０重量％）を投入後、洗剤組成物４４．０ｇを均一に散布投入し、５℃の水道水を注水し、『標準コース・洗い３分、高水位（６６Ｌ）』の設定で洗濯を行った。終了後（すすぎ工程は含まず）、洗濯ネットに残留する洗剤量を目視判定した。

【００３１】
【表２】

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a high bulk density detergent particle group.
[0002]
[Prior art]
The granular detergent composition is strongly directed to increase the bulk density and reduce the amount of use for the convenience of consumers. Such a high bulk density detergent can be produced by a conventionally known spray drying method. However, since this method requires a large amount of energy and space, other methods are attracting attention.
[0003]
A production method including neutralizing an acid precursor of an anionic surfactant with a solid alkali inorganic material is one of the most important ones. That is, a method for producing a high bulk density detergent in which an acid precursor of an anionic surfactant (water content of 1% or less) is used as a starting material and neutralized with a solid alkali inorganic material is a surfactant that is the mainstream of current detergent production methods. Unlike the production method in which the aqueous slurry (water content of 30 to 70%) is spray-dried using a starting material, a large-scale spray-drying apparatus is not required, so that the equipment cost is low and the energy is saved.
[0004]
For example, in Japanese Patent Laid-Open No. 60-72999, sulfonic acid, sodium carbonate, and water, which are cleaning components, are mixed with a powerful shearing device, and the resulting solid material is cooled to 40 ° C. or lower and then finely pulverized. And the method of granulating the obtained fine powder is disclosed. This method requires a kneader such as a kneader that can supply the extremely large energy necessary for causing the neutralization reaction to occur in the form of a dumpling. Japanese Patent Application Laid-Open No. 7-503750 and Japanese Patent Application Laid-Open No. 10-152700 disclose a method for producing detergent particles by neutralizing an acid precursor of an anionic surfactant with a small particle size neutralizing agent. Is disclosed. However, in this method, a homogeneous neutralized product cannot be obtained unless a high shear mixer is used.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to provide a method for producing detergent particles having a high bulk density, which can achieve reduction in energy costs during production, simplification of production facilities, and high detergent particles having excellent solubility. Is to provide.
[0006]
[Means for Solving the Problems]
The present invention comprises a step of mixing and neutralizing a powder (A) having an average particle size of 60 to 200 μm containing an alkali agent and an anionic surfactant acid precursor (B), and having a bulk density of 600 to 1200 g. The present invention relates to a method for producing a high bulk density detergent particle group having an average particle size of 250 to 800 μm, a high bulk density detergent particle group obtained by the production method, and a detergent composition containing the high bulk density detergent particle group.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The powder (A) comprises 25 to 100% by weight of carbonate, in particular 30 to 100% by weight, 0 to 75% by weight of phosphate, in particular 0 to 70% by weight, 0 to 5% by weight of fluorescent dye, in particular 0 to 1%. Preferably, it contains 0 to 10% by weight, especially 0 to 5% by weight of alkali metal aluminosilicate.
[0008]
The powder (A) has an average particle size of 60 to 200 μm, preferably 70 to 150 μm, more preferably 80 to 100 μm. This average particle diameter is determined by using a standard sieve (mesh 44, 62, 88, 125, 177, 250, 350, 500, 710, 1000, 1410, 2000 μm) of JIS Z 8801 using a low tap machine (manufactured by HEIKO SEISAKUSHO). 100 g of sample was vibrated for 5 minutes by tapping 156 times / minute, rolling 290 times / minute), and then obtained from the weight fraction according to the size of the mesh. Further, the particle size distribution of the powder (A) is 35% or more, particularly 40% or more of the product passing through a sieve having an opening of 88 μm, 75% or more, particularly 81% or more of the product passing through a sieve having an opening of 125 μm, and 177 μm. The product passing through the sieve is 90% or more, particularly 94% or more, and the product passing through the sieve 250 μm is 95% or more, preferably 97% or more. In the present invention, a neutral neutralized product with a low energy can be obtained by neutralization with the powder (A) having an appropriate average particle diameter.
[0009]
Examples of the acid precursor (B) of the anionic surfactant include sulfates of higher alcohols, sulfates of higher alcohol ethoxylates, alkylbenzene sulfonic acids, paraffin sulfonic acids, α-olefin sulfonic acids, α-sulfo fatty acids or the like. Examples include esters and fatty acids. In particular, linear alkylbenzene sulfonic acid having 10 to 18 carbon atoms, preferably 12 to 14 carbon atoms, and α-sulfo fatty acid alkyl ester having 10 to 20 carbon atoms are preferable.
[0010]
In the present invention, the powder (A) is 10 to 50% by weight of the final detergent particle group, particularly 25 to 50% by weight, and the precursor (B) is 5 to 40% by weight, particularly 15 to 35% by weight of the final detergent particle group. %, And the powder (A) / precursor (B) weight ratio is preferably 10/1 to 1/2, particularly 5/1 to 1/1.
[0011]
The step of mixing and neutralizing the powder (A) and the precursor (B) may be performed according to a known method. For example, methods described in JP-T-7-503750 and JP-A-10-152700 can be referred to. Further, the ratio of the powder (A) to the precursor (B) may be appropriately determined in consideration of the application and the like.
[0012]
The resulting high bulk density detergent particle group has a bulk density of 500 to 1200 g / L, preferably 600 to 1000 g / L, more preferably 700 to 900 g / L, and an average particle size of 150 to 800 μm, preferably 250 to 650 μm. is there. This bulk density is measured by the method of JIS K 3362. The average particle diameter is measured in the same manner as described above.
[0013]
The high bulk density detergent particle group of the present invention may be used as it is as a detergent composition, or may be obtained by adding other components such as enzymes, fragrances, aluminosilicates and the like.
[0014]
【Example】
Example 1
Of the components of Example 1 shown in Table 1, sodium tripolyphosphate (STPP), sodium carbonate, sodium sulfite, and fluorescent dye are mixed with a Redige mixer FKM-130D (manufactured by Matsubo Co., Ltd.), and the stirring blade is rotated at a peripheral speed. Mixing was performed at 3.4 m / s and a shearing machine peripheral speed of 27 m / s for 1 minute. The mixture is used as powder (A).
[0015]
Next, while operating the mixer under the same conditions, a mixture of linear alkyl (carbon number 12 to 14) benzene sulfonic acid (water content 0.5%) and sulfuric acid was added over 4 minutes, and further operated for 5 minutes to neutralize. Reaction was performed. During the neutralization reaction, 25 ° C. water was cooled through the jacket of the mixer. Air was allowed to flow into the mixer for the last 5 minutes. While operating the mixer under the same conditions, beef tallow fatty acid was added in 1 minute, and further operated for 5 minutes to carry out a neutralization reaction. During the neutralization reaction, 25 ° C. water was cooled through the jacket of the mixer, and air was introduced into the mixer.
[0016]
Next, while operating the mixer under the same conditions, a nonionic surfactant, polyethylene glycol (PEG 13000), and a 40% by weight aqueous solution of maleic acrylate copolymer (AA / MA copolymer) were added in 1 minute, and the system was further operated for 2 minutes. Granulation was performed. Subsequently, 13% by weight of zeolite was added, and the surface was modified by operating for another 2 minutes, and passed through a 2000 μm sieve to obtain a high bulk density detergent particle group.
[0017]
Further, using a rotating drum, the remaining zeolite, enzyme, and fragrance were added to the detergent particle group and mixed to obtain 35 kg of the final detergent composition shown in Table 1.
[0018]
Example 2
Among the components of Example 2 shown in Table 1, sodium carbonate, sodium sulfite, and fluorescent dye were mixed using a Redige mixer FKM-130D (manufactured by Matsubo Co., Ltd.) with a stirring blade at a peripheral speed of 3.4 m / s, shearing Mixing was performed at a peripheral speed of 27 m / s for 1 minute. The mixture is used as powder (A).
[0019]
Next, while operating the mixer under the same conditions, a mixture of linear alkyl (carbon number 12 to 14) benzenesulfonic acid (water content 0.5%) and sulfuric acid was added over 4 minutes, and the operation was continued for another 5 minutes. A sum reaction was performed. During the neutralization reaction, water at 25 ° C. was cooled through the mixer jacket. Air was allowed to flow into the mixer for the last 5 minutes.
[0020]
Next, 15% by weight of nonionic surfactant and zeolite were added while operating the mixer under the same conditions, and granulation was performed by operating for 2 minutes. Next, while operating the mixer under the same conditions, 7% by weight of the detergent composition was added to the zeolite, and a 40% by weight aqueous solution of polyethylene glycol (PEG 13000) and acrylic acid maleic acid copolymer (AA / MA copolymer) was added in 1 minute. In addition, granulation was carried out by operating for another 2 minutes. Subsequently, 5% by weight of zeolite was added, and the surface modification treatment was performed by operating for another 2 minutes, and passed through a 2000 μm sieve to obtain a high bulk density detergent particle group.
[0021]
Further, using a rotating drum, the remaining zeolite, enzyme, and fragrance were added to the detergent particle group and mixed to obtain 35 kg of the final detergent composition shown in Table 1.
Comparative Example 1
A high bulk density detergent particle group and a detergent composition were obtained in the same manner as in Example 1 except that the powder (A) was further finely pulverized by a pulverizer. Under the same conditions, neutralization was incomplete and did not become homogeneous.
[0022]
[Table 1]

[0023]
Here, LAS-Na is linear alkyl (C12-14) sodium benzenesulfonate. The nonionic surfactant is a polyoxyethylene alkyl ether having an alkyl group having 12 to 14 carbon atoms and an EO average addition mole number of 7. The AA / MA copolymer is an acrylic acid-maleic acid copolymer sodium salt (70 mol% neutralized), the monomer ratio is acrylic acid / maleic acid = 3/7 (molar ratio), and the average molecular weight is 70,000. As the fluorescent dye, a 1/1 weight ratio mixture of Tinopearl CBS-X and Tinopearl AMS-GX (manufactured by Ciba Specialty Chemicals) was used. As zeolite, 4A-type zeolite, average particle diameter of 3 μm (manufactured by Tosoh Corporation) was used. The enzyme used was a mixture of cellulase K (described in JP-A 63-264699) and lipolase 100T (manufactured by Novo) at a weight ratio of 3: 1.
[0024]
<Performance evaluation>
The following evaluation was performed about the high bulk density detergent particle group and detergent composition obtained by the Example and the comparative example. The results are shown in Table 2.
[0025]
[Average particle size]
Using a standard sieve of JIS Z 8801 (mesh opening 125, 177, 250, 350, 500, 710, 1000, 1410, 2000 μm), a low-tapping machine (made by HEIKO SEISAKUSHO, tapping 156 times / minute, rolling 290 times / minute) ), The median diameter was calculated from the weight fraction according to the size of the mesh.
[0026]
〔The bulk density〕
The measurement was performed by the method defined by JIS K 3362.
[0027]
[Measurement method of cleaning power]
First, an artificially contaminated cloth was prepared according to the method described in JP-A-10-168485, column 14, line 6. Subsequently, 5 pieces of 10 cm × 10 cm artificially contaminated cloths were put into 1 L of the detergent aqueous solution for evaluation, and washed with a tartometer at 100 rpm (washing condition: washing time 5 minutes, detergent concentration 0.0667 wt%, water hardness 4 ° Rinse with DH, water temperature 20 ° C., tap water for 5 minutes.) Detergency measures the reflectance at 550 nm of the raw cloth before contamination and before and after cleaning with a self-recording colorimeter (manufactured by Shimadzu Corporation). Asked.
[0028]
[Expression 1]

[0029]

[0030]
[Solubility of detergent]
A washing net (model number: AXW22A-5RU0, opening: 300 × 640 μm) was attached to the side surface of a washing tub of a washing machine “Aizuma No. NA-F70VP1” manufactured by Matsushita Electric Industrial Co., Ltd. Next, 3 kg of clothing (50% by weight of cotton underwear, 50% by weight of polyester / cotton blended Y-shirt) was added, then 44.0 g of the detergent composition was sprayed uniformly, and 5 ° C tap water was poured.・ Washing was performed with the setting of “High water level (66 L)” for 3 minutes. After completion (not including the rinsing step), the amount of detergent remaining on the laundry net was visually determined.

[0031]
[Table 2]

Claims

Powder (A) having an average particle size of 80 to 150 μm, comprising 25 to 100% by weight of carbonate, 0 to 75% by weight of phosphate, 0 to 5% by weight of fluorescent dye, and 0 to 10% by weight of alkali metal aluminosilicate And a method for producing a high bulk density detergent particle group having a bulk density of 600 to 1200 g / L and an average particle size of 250 to 650 μm, comprising a step of mixing and neutralizing the acid precursor (B) of an anionic surfactant Because
A method for producing a high bulk density detergent particle group in which the powder (A) is used in an amount of 10 to 50% by weight of the final detergent particle group and the precursor (B) is used in an amount of 15 to 35% by weight of the final detergent particle group.

The powder (A) and the precursor (B) are used such that the weight ratio of the powder (A) / precursor (B) in the final detergent particle group is 10/1 to 1/2. Production method.

The production method according to claim 1 or 2 , wherein the powder (A) contains 31 to 98% by weight of carbonate .

The high bulk density detergent particle group obtained by the manufacturing method in any one of Claims 1-3.

The detergent composition containing the high bulk density detergent particle group obtained by the manufacturing method in any one of Claims 1-3.