ES2537714T3 - Laundry detergent particles - Google Patents

Abstract

A coated detergent particle having perpendicular dimensions x, y and z, of which x is 1 to 2 mm, y is 2 to 8 mm and z is 2 to 8 mm, wherein the particle comprising: (i) 40 to 90% by weight of a surfactant selected from an anionic surfactant and a non-ionic surfactant; (ii) from 20 to 40% by weight of water-soluble inorganic salts, the water-soluble inorganic salts being a mixture of sodium carbonate and sodium silicate, and (iii) from 0 to 3% by weight of a perfume, in the that inorganic salts are present in the detergent particle as a coating and the surfactant is present as a core, and sodium carbonate and sodium silicate comprise 70 to 100% of the coating and the ratio of sodium carbonate: sodium silicate in the coating is in the range of 4: 1 to 2: 3.

Description

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DESCRIPTION

Laundry detergent particles

Field of the Invention

The present invention relates to large particles of laundry detergent.

Background of the invention

WO 9932599 describes a process for manufacturing laundry detergent particles, which is an extrusion process in which a detergency builder and a surfactant, the latter comprising as a principal component a sulfated or sulphonated anionic surfactant, are supplied to an extruder which operates mechanically at a temperature of at least 40 ° C, preferably at least 60 ° C, and is extruded through an extrusion head having a multiplicity of extrusion openings. In most of the examples, the surfactant is supplied to the extruder together with the detergency builder in a weight ratio of more than 1 part of detergency builder per 2 parts of surfactant. Apparently the extrudate required additional drying. In Example 6, PAS paste was dried and extruded. Such PAS nodules were well known in the prior art. Typically the nodules are shaped like cylinders and their length is greater than the diameter, as described in example 2.

US 7,022,660 discloses a procedure for the repair of a detergent particle having a coating.

Summary of the invention

The inventors have found that large detergent particles slide better after storage in wet conditions by the incorporation of silica in a carbonate. They have found that the ingress of water from carbonate-coated particles is reduced by the incorporation of silica in the coating, this contributes to the stability of the particles.

In another aspect, the present invention provides a coated detergent particle that is a concentrated formulation with more surfactant than inorganic solid. Only by having the coating that covers the surfactant that is soft can such a concentrate be concentrated in which the unit dose required for washing is reduced. The addition of solvent to the core would result in the conversion of the particle into a liquid formulation. On the other hand, having a larger amount of inorganic solid would result in a less concentrated formulation; a high inorganic content would have the disadvantage of approaching conventional granular powder of low surfactant concentration. The coated detergent particle of the present invention is in the middle of the two conventional formats (liquid and granular).

In one aspect, the present invention provides a coated detergent particle having the perpendicular directions x, y and z, being x 1 to 2 mm, and 2 to 8 mm and z 2 to 8 mm, a particle comprising

(i)

from 40 to 90% by weight of surfactant selected from: anionic surfactant and nonionic surfactant;

(ii)

(ii) from 20 to 40% by weight of water soluble inorganic salts, the water soluble inorganic salts comprising a mixture of sodium carbonate and sodium silicate, and

(iii) (iii) from 0 to 3% by weight of a perfume.

wherein the inorganic salts are present in the detergent particle as a coating and the surfactant is present as a core, and the sodium carbonate and sodium silicate comprise 70 to 100% by weight of the coating and the ratio of sodium carbonate: silicate Sodium in the coating is in the range of 4: 1 to 2: 3.

Preferably, the ratio of sodium carbonate: sodium silicate in the coating is 2: 1.

Preferably, the sodium carbonate and sodium silicate comprise from 80 to 100% by weight, preferably from 90 to 100% by weight and, most preferably, from 95 to 100% by weight of the coating. Unless otherwise stated, the entire percentage by weight is particle is dry weight.

Detailed description of the invention

Shape

Preferably, the laundry detergent particle is curved.

The laundry detergent particle can be lenticular (in the form of an entire dry lens), a deformed ellipsoid in which z and y are the Ecuadorian diameters and x is the polar diameter. Preferably y = z.

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The coated laundry detergent particle may have a disk shape.

Preferably, the coated laundry detergent particle has no hole; that is, the coated laundry detergent particle does not have a conduit that passes through the core, that is, the coated detergent particle has a topological genre of zero.

Nucleus

Surfactant

The coated laundry detergent particle comprises between 40 and 90% by weight, preferably between 50 and 90% by weight, of a surfactant, preferably between 70 and 90% by weight. In general, the nonionic and anionic surfactants of the surfactant system can be selected from the surfactants described in Surface Active Agents vol. 1, by Schwartz & Perry, Interscience 1949, vol. 2 by Schwatrz, Perry & Berch, Interscience, 1958, in the current edition of McCutcheon's Emulsifiers and Detergents, published by Manufacturing Confectioners Company or in Tenside Taschenbuch, H. Stache, 2nd ed., Carl Hanser Verlago, 1981. Preferably, surfactants Used are saturated.

Anionic surfactants

Suitable anionic detergent compounds that can usually be used are water-soluble alkali metal salts of organic sulfates and sulphonates having alkyl radicals containing from about 8 to about 22 carbon atoms, the term alkyl being used to include the alkyl radical portion upper acyl. Examples of suitable synthetic anionic detergent compounds are sodium and potassium alkyl sulfates, especially those obtained by sulfating C8-18 higher alcohols, produced, for example, from tallow or coconut oil, sodium and potassium C9-20 alkyl benzenesulfonates, in particular benzenesulfonates C10-15 alkyl linear sodium secondary; and sodium alkyl glyceryl ether sulfates, especially ethers of higher alcohols derived from tallow oil or coconut nut and synthetic petroleum-derived alcohols. Very preferred anionic surfactants are sodium lauryl ether sulfate (SLES), particularly preferred with 1 to 3 ethoxy groups, C10-15 alkyl sodium benzenesulfonates and C12-18 alkyl sodium sulfates. Also applicable are surfactants such as those described in EP-A-328 177 (Unilever), which show desalination resistance, the alkyl polyglucoside surfactants described in EP-A070 074 and alkylmonoglycosides. The chains of the surfactants can be branched or linear.

Soaps may also be present. Preferably, the fatty acid soap used contains from about 16 to about 22 carbon atoms, preferably with a linear chain configuration. The anionic contribution of the soap is preferably 0 to 30% by weight of the anionic total.

Preferably, at least 50% by weight of the anionic surfactant is selected from C11-15 alkyl sodium benzenesulfonates; and C12-18 alkyl sodium sulfates. Even more preferably, the anionic surfactant is C11-15 alkyl sodium benzenesulfonate.

Preferably, the anionic surfactant is present in the coated laundry detergent particle at levels between 15 and 85% by weight, more preferably between 50 and 80% by weight of the total surfactant.

Nonionic Surfactants

Suitable non-ionic detergent compounds that can be used include in particular products of compounds having a hydrophobic group and a reactive hydrogen atom, for example aliphatic alcohols, acids, amides or alkylphenols with alkylene oxides, especially ethylene oxide alone or with propylene oxide. Preferred non-ionic detergent compounds are condensed from C6-22 alkyl phenol-ethylene oxide, generally from 5 to 25 EO, that is, from 5 to 25 units of ethylene oxide per molecule, and the condensation products of C8- aliphatic alcohols. 18 primary or secondary, linear or branched, with ethylene oxide, generally 5 to 50 EO. Preferably the nonionic is 10 to 50 EO, more preferably 20 to 35 EO. In particular, alkyl ethoxylates are preferred.

Preferably the non-ionic surfactant is present in the laundry detergent particle at levels between about 5 and 75% in relation to the total surfactant, more preferably between 10 and 40% by weight with respect to the entire surfactant.

A cationic surfactant may be present as a minor ingredient at levels between 0 and 5% by weight over the entire surfactant.

Preferably, all surfactants are mixed before drying. Conventional mixing equipment can be used. The surfactant core of the laundry detergent particle must be formed by extrusion or roller compaction and subsequently coated with an inorganic salt.

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Surfactant system that tolerates calcium

In another aspect, the surfactant system used is tolerant of calcium and this is a preferred aspect because it reduces the need for detergency builder.

Surfactant mixtures that do not require the presence of adjuvants are preferred to have an effective detergency in water. Such mixtures are called mixtures of calcium tolerant detergents if they pass the test considered below. However, the invention can also be used for washing with soft water, whether natural or made with softened water. In this case, calcium tolerance is no longer important and waters other than those that tolerate calcium can be used.

The surfactant mixture in question is prepared at a concentration of 0.7 g of surfactant solids per liter of water containing calcium ions sufficient to result in a French hardness of 40 (4 x 40 x 10-3 M Ca2 +). To the solution are added other ion-free electrolytes such as sodium chloride, sodium sulfate and sodium hydroxide to adjust the ionic strength to 0.05M and the pH to 10. Wavelength light absorption of 540 nm is measured 15 minutes After sample preparation. Ten measurements are made and an average value is calculated. Samples that give an absorption value of less than 0.08 are estimated to be calcium tolerant.

Examples of surfactants that satisfy the previous calcium tolerance test include those that have a significant portion of LAS surfactant (which is not itself calcium tolerant) mixed with one or more surfactants (co-surfactants) that tolerate calcium by giving a mixture that tolerates calcium sufficiently so that it can be used without detergency builder or with little detergency builder and pass the given test. Suitable calcium tolerant co-surfactants include SLES 1-7EO and nonionic alkyl ethoxylate surfactants, in particular those with a melting point below 40 ° C.

A mixture of LAS / SLES surfactants has a foam profile superior to a mixture of LAS non-ionic surfactant and is therefore preferred for hand wash formulations that require high levels of foam. SLES can be used at levels up to 30% by weight of the surfactant mixture.

Water soluble inorganic salts

The water soluble inorganic salt is present as a coating of the particle. Preferably the water soluble inorganic salt is present at a level that reduces the thickness of the laundry detergent particle to a point where the particle slides freely.

Those skilled in the art will appreciate that while multi-layer coating of the same or different materials could be applied, an individual coating layer is preferred for operational simplicity and to maximize the thickness of the coating.

The coating is especially applied to the surface of the surfactant core by depositing from an aqueous solution of the water-soluble inorganic salt. Alternatively, the coating can be done using a suspension. The aqueous solution preferably contains more than 50 g / l, more preferably more than 200 g / l of the salt. An aqueous distribution by atomization of the aqueous fluidized bed solution has been found to give good results and can also generate a slight rounding of the detergent particles during the fluidization process. To finish the process it may be necessary to dry and / or cool.

A preferred particle of calcium-tolerant coated laundry detergent comprises 15 to 100% by weight on anionic surfactant of which 20 to 30% on surfactant is sodium lauryl ether sulfate.

Preferably the coating is applied as a solution and not as a suspension.

Coated laundry detergent particle

Preferably, the coated laundry detergent particle comprises from 10 to 100% by weight, more preferably from 50 to 100% by weight, even more preferably from 80 to 100% by weight and, most preferably, from 90 to 100% by weight. , of a laundry detergent formulation in a container

The package is that of a commercial formulation for sale to the general public and is preferably in the range of 0.01 to 5 kg, preferably 0.02 kg to 2 kg, most preferably 0.5 to 2 kg.

Preferably, the coated laundry detergent particle is such that at least 90 to 100% of the laundry detergent particles coated in dimensions x, and yz vary within 20%, preferably 10%, from the most large to the smallest of laundry detergent.

Water content

The particle preferably comprises 0 to 15% water, more preferably 0 to 10%, most preferably 1 to 5% water, at 293 ° K and 50% r.h. These facilitates the storage stability of the

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particle and its mechanical properties.

Other adjuvants

The adjuvants described below may be present in the coating or core. These may be in the core or lining.

Fluorescent agent

The coated laundry detergent particle preferably comprises a fluorescent agent (optical brightener). Fluorescent agents are well known and many of them are commercially available. Usually these fluorescent agents are supplied and used in the form of alkali metal salts, for example sodium salts. The total amount of the fluorescent agent or agents used in the composition is generally 0.005 to 2% by weight, more preferably 0.01 to 0.1% by weight. The fluorescent agent for use in the invention is described in Chapter 7 of Industrial Dyes edited by K. Hunger 2003, Wiley-VCH ISBN 3-52730426-6.

Preferred fluorescent agents are selected from the classes of distyrylbiphenyls, triazinylamino-stilbenes, bis (1,2,3-triazol-2-yl) stilbene, bis (benzo [b] furan-2-yl) biphenyls, 1,3-diphenyl- 2-pyrazolines and coumarins. Preferably the fluorescent agent is sulfonated.

Preferred classes of fluorescent agents are: di-styrylbiphenyl compounds, for example, Tinopal (trademark) CBS-X, Di-aminoestylbeno di-sulfonic acid compounds, for example, Tinopal pure Xtra and Blankophor (trademark) HRH, and pyraziline compounds, for example, Blankophor SN. Preferred fluorescent agents are 2- (4-styryl-3-sulfophenyl) -2H-naphthol [1,2-di] triazole disodium, 4,4'-bis {[(4-anilino-6- (N-methylN- 2 hydroxyethyl) amino 1,3,5-triazin-2-yl)] amino} stilbene-2-2'-disulfonate disodium, 4,4'-bis {[(4-anilino-6-morpholino1,3,5- triazin-2-yl)] amino} -stilbene-2-2'-disulfonate disodium, and 4,4'-bis (2-sulfoestyryl) biphenyl disodium.

Tinopal DMS is the disodium salt of 44’-bis {[(4-anilino-6-morpholino-1,35-trizin-2-yl)] amino} stilbene-2-2’ disodium disulfonate. Tinopal CBS is the disodium salt of 4,4’-bi (2-sulfoestiryl) biphenyl

Fragrance

Preferably the composition comprises a perfume. Preferably the perfume is in an amount of 0.001 to 3% by weight, most preferably 0.1 to 1% by weight. In CTFA (Cosmetic, Toiletry and Fragrance Association) 1992 International Buyers Guide, published by CFTA Publications and OPD 1993 Chemical Buyers Directory 80th Annual Edition, published by Schnell Publishing Co. there are many suitable examples of perfumes.

It is a common place for a plurality of perfume components to be present in a formulation. In the compositions of the present invention it is contemplated that there are four or more different perfume components, preferably five or more, more preferably six or more or even seven or more.

In perfume mixtures, preferably 15 to 25% by weight are reference notes. The notes are defined by Poucher (Journal of the Society of Cosmetic Chemists 6 (2): 80 [1955]). Preferred reference notes are selected from citrus oils, linalool, linalyl acetate, lavender, dihydromyrcene. rose oxide and cis-3hexanol.

The perfume serves to disaggregate the dye and make the dye more visible.

It is preferred that the coated laundry detergent particle does not contain a peroxygen bleach, for example, sodium percarbonate, sodium perborate and peracid.

Polymers

The composition may comprise one or more polymers. Examples are sodium carboxymethyl cellulose, polyethylene glycol, polyvinyl alcohol, polyethyleneimine, ethoxylated polyethyleneimines, water soluble polyester polymers, polycarboxylates such as polyacrylates, maleic / acrylic acid copolymers and lauryl / acrylic acid copolymers.

Enzymes

In a composition of the invention it is preferred that one or more enzymes are present.

Preferably the level of each enzyme is from 0.0001% by weight to 0.5% by weight of protein in the product.

Especially contemplated enzymes include proteases, alpha-amylases, cellulases, lipases, peroxidases / oxidases, pectate liases and manases, or mixtures thereof.

Especially contemplated enzymes include those of bacterial or fungal origin. Chemically modified mutants or those engineered for protein engineering are included. Among the examples of lipases 5 5

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Suitable are Humicola lipases (synonym Thermomyces), for example of H Lanuginosa (T. lanuginosa) as described in EP 258 068 and EP 305 216, or H. insolens as described in WO 96/13580, a Pseudomonas lipase, for example P. alkigenas or P. pseudoalcaligenas (EP 218 272), P. cepacia, (EP 331 376), P. stutzen (GB 1,372,034), P. fluorescens, Pseudomonas sp. strain SD 705 (WO 95/06720 and WO 96/27002),

P. wisconsinensis (WO 96/12012), a Bacillus lipase, for example of B. subtilis (Dartois et al. (1993), Biochemicals et Biophysica Acta, 1131, 253-360), B. Stearothermophilus (JP 64/744992) or B. Pumilus (WO 91/16422).

Other examples are lipase variants such as that described in WO 92/05249, WO 94/01541, EP 407 225, EP -260 105, WO 95/35381, WO 96/00292, WO 95/30744, WO 94 / 25578, WO 95/14783, WO 95/22615, WO 97/04079 and WO 97/07202, WO 00/60063, WO 09/107091 and WO 09/111258.

Commercially available preferred lipase enzymes include LipolaseMC and Lipolase UltraMC, LipexMC (Novozymes A / S) and LipocleanMC.

The process of the invention can be performed in the presence of phospholipase classified as EC 3,1,1,4 and / or EC

3.1.1.32. As used herein, the term phospholipase is an enzyme that has activity against phospholipids.

Phospholipids such as lecithin or phosphatidylcholine consist of glycerol esterified with two fatty acids in an outer position (sn-1) and in the central one (sn-2) and esterified with phosphoric acid in the third position; The phosphoric acid, in turn, can be esterified with an amino alcohol. Phospholipases are enzymes that participate in the hydrolysis of phospholipids. Several types of phospholipase activity can be distinguished, including phospholipases A and A2 that hydrolyse a fatty acyl group (at position sn-1 and sn-2, respectively) forming lysophospholipid; and lysophospholipase (or phospholipase B) that can hydrolyze the remaining fatty acyl group in lysophospholipid. Phospholipase C and phospholipase D (phosphodiesterases) release diacylglycer or phosphatidic acid respectively.

Suitable proteases include those of animal, plant or microbial origin. Those of microbial origin are preferred. Chemically modified and protein engineered mutants are included. The protease may be a serine protease or a metal protease, preferably an alkaline microbial protease or a trypsin-like protease. Commercially available preferred protease enzymes include AlcalaseMC, SavnaseMC, PrimaseMC, DuralaseMC, DyrazymMC, EsperaseMC, EverlaseMC, PolarazymeMC, and KannaseMC, (Novozymes A / S, MaxataseMC, MaxacalMC, MaxapemCMCMCMCMMM, PmMMM, PFMMMM, PFMCMCMMMM, PFMPMCMMPMCMPMCMPMCMPMCMPMCMPMCMPMCMMPMCMPMCMMPMCMMPMCMMPMCMMPMCMPMCMMPMP Genencor International Inc.).

The process of the invention can be performed in the presence of cutinase classified EC 3.1.1.74. The cutinase used according to the invention can be of any origin. Preferably the cutinases are of microbial origin, in particular of bacterial or fungal origin or of yeast origin.

Suitable amylases (alpha and / or beta) include those of bacterial or fungal origin. Chemically modified and protein engineered mutants are included. Among the amylases are, for example, alpha-amylases obtained from Bacillus, for example, a special strain of B. licheniformis, described in greater detail in GB 1,296,839, or the strains of Bacillus sp. described in WO 95/026397 or WO 00/060060. DuramylMC, TermamylMC, Termamyl UltraMC, NatalaseMC, StainzymeMC, FungamylMC, and BANMC (Novozymes A / S, RapidaseMC and PurastarMC (from Genencor International Inc)) are commercially available amylases.

Suitable cellulases include those of bacterial or fungal origin. Chemically modified and protein-engineered mutants are included. Suitable celluloses include those of the genera Bacillus, Pseudomonas, Humicola, Fusarium, Thielavia, Acremonium, for example the fungal cellulases produced from Humicola insolens, Thielavia terrestris, Myceliophtora thermophila and Fusarium oxysporum, described in US 4, 35, US documents 5,648,263, US 5,691,178, US 5,776,757, WO 89/09259, WO 96/029397 and WO 98/012307. Commercially available cellulases include CelluzymeMC, CarezymeMC, EndolaseMC, RenozymeMC (Novozymes A / S), ClacinaseMC and Puradax HAMC (Genencor International Inc.) and KAC-500 (B) MC (Kao Corporation).

Suitable peroxidases / oxidases include those of plant, bacterial or fungal origin. Chemically modified and protein engineered mutants are included. Examples of useful peroxidases include Coprinus peroxidases, for example C. cinereus and variants thereof as described in WO 93/24618, WO 95/10602 and WO 98/15257. Commercially available peroxidases include GuardzymeMC and Novozym MC 51004 (Novozymes A / S).

In WO 2009/087524, WO 2009/090576, WO 2009/148983 and WO 2008/007318 other enzymes suitable for use are disclosed.

Enzyme stabilizers

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Any enzyme present in the composition can be stabilized using conventional stabilizing agents, for example a polyol such as propylene glycol or glycerol, a sugar or a sugar alcohol, lactic acid, boric acid or a boric acid derivative, for example, a borate ester aromatic, or a phenylaromatic acid derivative such as 4-formylboronic acid, and the composition can be formulated as described, for example, in WO 92/19709 and WO 92/19708.

When the alkyl groups are long enough to form branched or cyclic chains, the alkyl groups encompass branched, cyclic and linear alkyl chains. The alkyl groups are preferably linear or branched, most preferably linear.

The indefinite article "a" and its corresponding definite article "the" as used herein mean at least one or one or more, unless otherwise specified. The singular encompasses the plural unless otherwise specified.

Sequestrants may be present in the laundry detergent particles coated.

It is preferred that laundry detergent particles have a core to shell ratio of 3 to 1: 1, most preferably 2.5 to 1.5: 1. being the optimal ratio of core to wrap 2: 1.

Experimental part

Example 1. Particle production

Preparation of the core of particles 1 & 2

1 core particle. 1962.5 g of ground dry surfactant mixture (LAS / PAS / SLES.3eo (58.3-14.6-27.1 by weight) were mixed intimately with 37.38 g of perfume oil and 30.1 g of carboxymethylcellulose Sodium

2 core particle. 1962.5 g of ground dry surfactant mixture (LAS / PAS / SLES.3eo (58.3-14.6-27.1 by weight) were mixed intimately with 37.38 g of perfume oil and 30.1 g of carboxymethylcellulose Sodium

The mixtures were then extruded using a ThermoFisher 24 HC double extruder at a rate of 8 kg / h. The inlet temperature of the extruder was set at 20 ° C, raising it to 40 ° C just before the mold plate. The mold plate was drilled with 6 circular holes of 5 mm in diameter.

The extrudates were cut after the mold plate using a high speed cutter adjusted to produce particles of a thickness of  1.1 mm.

Coating

1200 g of the above extrudates were loaded into the fluidization chamber of a Strea 1 fluidized bed laboratory dryer (Aeromatic-Fielder AG) and spray coated using 1714 g of a solution containing 342.8 g of sodium carbonate with 342.8 g of 50% alkali silicate solution (defined as 2.1 to 2.6 of Sio2 to 1 Na2O) in 1028.4 g of water, using a header atomization configuration.

The coating solution was supplied to the spray nozzle of Strea 1 by means of a peristaltic pump (Watson-Marlow model 101 U / R) at an initial rate of 3.3 g / min increasing it to 9.1 g / nin over the course of the coating test.

The fluidized bed device operated at an initial air inlet temperature of 55 ° C, which was increased to 90 ° C during the coating test while maintaining the outlet temperature in the range of 45-50 ° C throughout the process Coating,

Storage procedure and results

200 g of coated granules were placed in a cardboard box opened by the lid. The samples were stored in an environment at 27 ° C and 70% h.r. for 2 weeks or 4 weeks After that time the boxes were emptied and the sliding and the crystal sensation was checked.

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Storage results (ash = sodium carbonate)

Sample

2 week storage 4 week storage

Base LAS / Ni-30oe Coated 30% ash Coated with 20% ash 10% silicate Base LAS / PAS / SLES Coated 30% ash Coated with 20% ash 10% silicate

Slightly slow Free slip Free slide Free slide Moderately crispy Crispy Soft Crispy Slightly slow Slightly slow Does not slide Free slip Moderately crispy Moderately crispy Soft Crispy

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Key to symbols used when classifying storage behavior

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The dust slip is estimated after

Determined the effect by touch that the container opens and inverts

F = free slip

C = Crispy SS = slightly slow

MC = moderately crispy S = Slow

MS = moderately soft L = Lumps

S = soft20 SC = Slightly crispy

M = wet Does not slide

W = wet

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Claims (13)

5 10 fifteen twenty 25 30 35 40 Four. Five 1. A coated detergent particle having the perpendicular dimensions x, y and z, of which x is 1 to 2 mm, and is 2 to 8 mm and z is 2 to 8 mm, in which the particle comprising:

(i)

 40 to 90% by weight of a surfactant selected from an anionic surfactant and a non-ionic surfactant;

(ii)

 20 to 40% by weight of water-soluble inorganic salts, the water-soluble inorganic salts being a mixture of sodium carbonate and sodium silicate, and

(iii) from 0 to 3% by weight of a perfume, wherein inorganic salts are present in the detergent particle as a coating and the surfactant is present as a core, and sodium carbonate and sodium silicate comprise 70 to 100% of the coating and the ratio of sodium carbonate: sodium silicate in The coating is in the range of 4: 1 to 2: 3.

2.

A coated detergent particle according to claim 1, wherein the ratio of sodium carbonate to sodium silicate is 2: 1.

3.

A coated detergent particle according to claim 1 or 2, wherein the sodium carbonate and sodium silicate comprise 80 to 100% by weight of the coating.

Four.

A coated detergent particle according to claim 3, wherein the sodium carbonate and sodium silicate comprise 90 to 100% by weight of the coating.

5.

A coated detergent particle according to claim 4, wherein the sodium carbonate and sodium silicate comprise 95 to 100% by weight of the coating.

6.

A coated detergent particle according to any one of the preceding claims, wherein the coated detergent particle comprising 15 to 85% by weight of anionic surfactant on the surfactant and 5 to 75% by weight of non-ionic surfactant on the surfactant.

7.

 A coated detergent particle according to any one of the preceding claims 1 to 6, wherein the coated detergent particle comprising 15 to 100% by weight of anionic surfactant on the surfactant of which 20 to 30% in Weight is sodium lauryl ether sulfate.

8.

A coated detergent particle according to any one of the preceding claims, wherein the anionic surfactant is selected from alkylbenzenesulfonates; alkyl ether sulfates; alkyl sulfates.

9.

A coated detergent particle according to claim 8, wherein the anionic surfactant is selected from sodium lauryl ether sulfate with 1 to 3 ethoxy groups, C10-15 alkyl sodium benzenesulfonates and C12-18 alkyl sodium sulfates.

10.

 A coated detergent particle according to any one of the preceding claims wherein the non-ionic surfactant is 10 to 50 EO.

eleven.

A coated detergent particle according to claim 10, wherein the nonionic surfactant is the condensation product of primary or secondary C8-18 aliphatic alcohols, linear or branched with 20 to 35 ethylene oxide groups.

12.

A coated detergent particle according to any one of the preceding claims, wherein the particle comprising 0 to 15% by weight of water.

13.

A coated detergent particle according to claim 12, wherein the particle comprising 1 to 5% by weight of water.

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