EP3409752A1 - Sprühgetrocknetes pulverreinigungsmittel mit leichtem silikat - Google Patents

Sprühgetrocknetes pulverreinigungsmittel mit leichtem silikat Download PDF

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Publication number
EP3409752A1
EP3409752A1 EP17173958.4A EP17173958A EP3409752A1 EP 3409752 A1 EP3409752 A1 EP 3409752A1 EP 17173958 A EP17173958 A EP 17173958A EP 3409752 A1 EP3409752 A1 EP 3409752A1
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EP
European Patent Office
Prior art keywords
spray
dried powder
less
salt
dried
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP17173958.4A
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English (en)
French (fr)
Inventor
Sayed FARAHAT
Bernhard Guckenbiehl
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Henkel AG and Co KGaA
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Henkel AG and Co KGaA
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Filing date
Publication date
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Priority to EP17173958.4A priority Critical patent/EP3409752A1/de
Publication of EP3409752A1 publication Critical patent/EP3409752A1/de
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/02—Anionic compounds
    • C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
    • C11D1/22—Sulfonic acids or sulfuric acid esters; Salts thereof derived from aromatic compounds
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D11/00—Special methods for preparing compositions containing mixtures of detergents
    • C11D11/02—Preparation in the form of powder by spray drying
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
    • C11D17/06—Powder; Flakes; Free-flowing mixtures; Sheets
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/02—Inorganic compounds ; Elemental compounds
    • C11D3/04—Water-soluble compounds
    • C11D3/046—Salts
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/02—Inorganic compounds ; Elemental compounds
    • C11D3/04—Water-soluble compounds
    • C11D3/06—Phosphates, including polyphosphates
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/02—Inorganic compounds ; Elemental compounds
    • C11D3/04—Water-soluble compounds
    • C11D3/08—Silicates
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/02—Inorganic compounds ; Elemental compounds
    • C11D3/04—Water-soluble compounds
    • C11D3/10—Carbonates ; Bicarbonates
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/02—Inorganic compounds ; Elemental compounds
    • C11D3/12—Water-insoluble compounds
    • C11D3/122—Sulfur-containing, e.g. sulfates, sulfites or gypsum
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/02—Inorganic compounds ; Elemental compounds
    • C11D3/12—Water-insoluble compounds
    • C11D3/1233—Carbonates, e.g. calcite or dolomite
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/02—Inorganic compounds ; Elemental compounds
    • C11D3/12—Water-insoluble compounds
    • C11D3/124—Silicon containing, e.g. silica, silex, quartz or glass beads
    • C11D3/1246—Silicates, e.g. diatomaceous earth
    • C11D3/128—Aluminium silicates, e.g. zeolites
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
    • C11D2111/10—Objects to be cleaned
    • C11D2111/12—Soft surfaces, e.g. textile

Definitions

  • the present invention relates to a solid laundry detergent composition
  • a solid laundry detergent composition comprising a spray-dried powder comprising a detersive surfactant and silicate and a dried light density silicate salt.
  • the present invention also relates to a process for preparing such a solid laundry detergent composition comprising dried light density silicate salt.
  • Laundry detergents are widely used in powder form.
  • the majority of these detergent powders include or consist of a spray-dried powder component produced in a typically continuous process in a spray drying tower. While it would be desirable to provide stable powder detergents with low density, the spray-dried powders of low bulk density tend to compact over time, since during storage the comparably instable low density spray-dried powder particles are susceptible to crumbling, thus forming dust, with the result that the bulk density of the powder increases over time.
  • the consumer thus ends up with a product having a very high bulk density, which is undesirable for a number of reasons, such as ease of dosing, solubility, dust exposure and the like.
  • the production of low density spray-dried detergent powders is highly energy consuming and therefore causes high carbon dioxide emissions.
  • the low density spray dried detergent powders tend to have higher segregation, lumping and suboptimal solubility.
  • European patent application EP 2 123 743 A1 describes that the incorporation of a silicate salt that has a low bulk density and a very small weight average particle size into chemically compacted zeolite-free formulations enables them to be produced using traditional batch processes, and even a batch single mixer processes and provides a solid laundry detergent composition and a process for its preparation including such a silicate salt. While the compositions described in this document show good mechanical properties, they are limited to those produced in a batch process.
  • a solid laundry detergent composition that comprises, in addition to a conventionally produced spray-dried powder detergent, a dried light density silicate salt in amounts of at least 1 wt.-%. It could be shown that such compositions that comprise in addition to the spray-dried powder detergent particles, particles of light density silicate salts, in particular spray-dried particles of said silicate salt, are more resistant towards segregation and lumping and show increased mechanical properties and good wash performance.
  • the present invention therefore relates to a solid laundry detergent composition having a bulk density of 600 g/L or less, comprising relative to the total weight of the composition:
  • Another aspect of the invention is directed to a process for the preparation of a solid laundry detergent composition as described herein, the process comprising the steps of
  • At least one relates to one or more, i.e. 1, 2, 3, 4, 5, 6, 7, 8, 9, or more. If used in combination with a compound, the term does not relate to the absolute number of molecules but rather to the number of different types of said compound. "At least one surfactant” thus means that at least one type but that also 2 or more different surfactant types can be present.
  • viscosities referred to herein are viscosities measured at 20°C by a Brookfield LVT, Spindle No. 3 at 12 rpm.
  • Free of means that the referenced composition does not contain the respective component in deliberately added form. In various embodiments, this means that the respective component is present in concentrations of no more than 1 wt.%, preferably no more than 0.5 wt.%, more preferably no more than 0.1 wt.% of said component relative to the total weight of the composition. Most preferably, said component is not contained at all.
  • the detergent compositions of the present invention can be used as detergents for textiles, carpets or natural fibers.
  • Wash(ing) performance relates to the removal of stains, in particular stains sensitive to surfactants.
  • the removal can be evaluated by measuring a brightening of the stain either instrumentally or by visual inspection.
  • the solid laundry detergent composition of the invention has a bulk density of 600g/l or less, preferably 500g/l or less, or 450g/l or less, or 400g/l or less, or even 350g/l or less. A method for measuring the bulk density of a powder is described in more detail below.
  • the solid laundry detergent composition typically has a cake strength of from 5N to 20N.
  • the solid laundry detergent composition of the invention comprises as a first component, 60 to 95 wt.-%, preferably 70 to 95 wt.-% of a spray-dried powder, comprising relative to the total weight of the spray-dried powder:
  • the spray-dried powder component comprises from 5 wt.-% to 60 wt.-% of a detersive surfactant.
  • the detersive surfactant can be selected from anionic detersive surfactants, cationic detersive surfactants, nonionic detersive surfactants, zwitterionic detersive surfactants, amphoteric detersive surfactants, and mixtures thereof.
  • the detersive surfactant comprises anionic detersive surfactant.
  • Suitable anionic detersive surfactants are alkoxylated alcohol sulfate anionic detersive surfactants such as linear or branched, substituted or unsubstituted ethoxylated C12-18 alcohol sulfates having an average degree of ethoxylation of from 1 to 10, preferably from 3 to 7.
  • alkyl benzene sulfonate anionic detersive surfactants such as linear or branched, substituted or unsubstituted C8-18 alkyl benzene sulfonates, preferably linear unsubstituted C10-13 alkyl benzene sulfonates.
  • Other suitable anionic detersive surfactants are alkyl sulfates, alkyl sulfonates, alkyl carboxylates or any mixture thereof.
  • the detersive surfactant comprises at least one alkyl benzene sulfonate.
  • alkyl benzene sulfonates include, but are not limited to linear and branched alkyl benzene sulfonates, preferably linear alkyl benzene sulfonates.
  • Exemplary compounds are those of formula (I) wherein R' and R" are independently H or alkyl and combined comprise 9 to 19, preferably 9 to 15 and more preferably 9 to 13 carbon atoms. Particularly preferred are dodecyl and tridecyl benzene sulfonates, in particular the sodium salts thereof.
  • Preferred contents of the alkyl benzene sulfonates range from 10 to 25 wt.-%, preferably 12.0 to 20.0 wt.%, relative to the total weight of the spray dried powder. While reference is made herein to the sulfonates and particularly the sodium salts thereof, it is understood that the invention also encompasses salts with other metals, ammonium or organic bases, such as alkanolamines. Further, it is understood that also the free acid forms, also referred to as "acidic precursors" may be used.
  • the detersive surfactant may further or alternatively comprises at least one alkyl ether sulfate.
  • Preferred alkyl ether sulfates are those of formula (II) R 1 -O-(AO) n -SO 3 - X + (II).
  • R 1 represents a linear or branched, substituted or unsubstituted alkyl group, preferably a linear, unsubstituted alkyl group, more preferably a fatty alcohol moiety.
  • R 1 moieties are selected from the group consisting of decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl moieties and mixtures thereof, wherein those groups with an even number of carbon atoms are preferred.
  • R 1 moieties are derived from C 10 -C 18 fatty alcohols, such as those derived from coconut oil alcohols, tallow fatty alcohols, lauryl, myristyl, cetyl or stearyl alcohol or from C 10 -C 20 oxoalcohols.
  • AO represents an ethyleneoxide (EO) or propyleneoxide (PO) group, preferably an ethyleneoxide group.
  • the index n represents an integer from 1 to 50, preferably from 1 to 20 and more preferably from 1 to 10. Particularly preferably, n is 1, 2, 3, 4, 5, 6, 7 or 8.
  • X represents a monovalent cation or the n-th part of an n-valent cation, preferred are alkali metal cations, specifically Na + and K + , most preferably Na + .
  • Further cations X + may be selected from NH 4 + , 1 ⁇ 2 Zn 2+ ,1 ⁇ 2 Mg 2+ ,1 ⁇ 2 Ca 2+ ,1 ⁇ 2 Mn 2+ , and combinations thereof.
  • the level of ethoxylation is an average value and can, for a specific compound, be an integer or fractional number.
  • the alkyl ether sulfate may be contained in the spray dried powder in an amount of 2.0 to 8.0 wt.% relative to the total weight of the powder, preferably 3.0 to 7.0 wt.%.
  • the detersive surfactant may also comprise non-ionic detersive surfactants.
  • Suitable non-ionic detersive surfactants are selected from: C8-18 alkyl alkoxylated alcohols having an average degree of alkoxylation of from 1 to 20, preferably from 3 to 10, most preferred are C12-18 alkyl ethoxylated alcohols having an average degree of alkoxylation of from 3 to 10; and mixtures thereof.
  • Preferred nonionic surfactants are those of formula (IV) R 2 -O-(AO) m -H (IV), wherein R 2 represents a linear or branched substituted or unsubstituted alkyl moiety, AO represents an ethylene oxide (EO) or propylene oxide (PO) group and m is an integer from 1 to 50.
  • R 2 preferably represents a linear or branched, substituted or unsubstited alkyl group, preferably a linear, unsubstituted alkyl group, particularly preferred a fatty alcohol group.
  • R 2 are selected from decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl, nonadecyl, eicosyl groups and combinations thereof, wherein those groups with an even number of carbon atoms are preferred.
  • Particularly preferred are R 2 groups derived from C 12 -C 18 fatty alcohols, such as coconut oil alcohol, tallow oil alcohol, lauryl, myristyl, cetyl or stearyl alcohol or from C 10 -C 20 oxoalcohols.
  • AO represents an ethyleneoxide (EO) or propyleneoxide (PO) group, preferably an ethyleneoxide group.
  • the index m represents an integer from 1 to 50, preferably from 1 to 20 and more preferably from 3 to 10. Particularly preferably, m is 3, 4, 5, 6 or 7.
  • Such nonionic alkyl ethers may be contained in the spray dried powder in amounts of 0.0 to 5.0 wt.%, preferably 2.0 to 3.0 wt.%.
  • the detergents may further include other nonionic surfactants, such as alkyl glucosides of the general formula RO(G) x , where R is a primary linear or 2-methyl-branched aliphatic radical containing 8 to 22 and preferably 12 to 18 carbon atoms and G stands for a glucose unit.
  • R is a primary linear or 2-methyl-branched aliphatic radical containing 8 to 22 and preferably 12 to 18 carbon atoms and G stands for a glucose unit.
  • the degree of oligomerization x which indicates the distribution of monoglucosides and oligoglucosides, is a number of 1 to 10 and preferably a number of 1.2 to 1.4.
  • the detersive surfactant comprises at least two anionic surfactants, namely at least one alkyl ether sulfate and preferably at last one alkyl benzene sulfonate, and optionally an alkyl ether.
  • the detersive surfactant may also comprise cationic detersive surfactants.
  • Preferred cationic detersive surfactants are mono-C6-18 alkyl mono-hydroxyethyl di-methyl quaternary ammonium chlorides, more preferred are mono-C8-10 alkyl mono-hydroxyethyl di-methyl quaternary ammonium chloride, mono-C10-12 alkyl mono-hydroxyethyl di-methyl quaternary ammonium chloride and mono-C10 alkyl mono-hydroxyethyl di-methyl quaternary ammonium chloride.
  • Suitable amphoteric and zwitterionic surfactants include amine oxides and betaines.
  • the spray-dried powder comprises from 0 wt.-% to 50 wt.-%, preferably 1 to 45, more preferably 10 to 30 wt.-%, carbonate salt.
  • a preferred carbonate salt is sodium carbonate, sodium bicarbonate and a mixture thereof.
  • a most preferred carbonate salt is sodium carbonate.
  • the spray-dried powder comprises from 0 wt.-% to 50 wt.-%, preferably 1 to 45, more preferably 10 to 30 wt.-% sulfate salt.
  • a preferred sulfate salt is sodium sulfate.
  • the spray-dried powder comprises less than 5 wt.-%, preferably from 0 wt.-% to ⁇ 2wt.-%, more preferably less than 1 wt.-% phosphate builder. It may even be preferred for the composition to be free from phosphate builder. Phosphate builders include sodium tripolyphosphate. Preferably, the solid laundry detergent composition is essentially free of or free of phosphate.
  • the spray-dried powder comprises less than 5 wt.-%, preferably from 0 wt.-% to ⁇ 2wt.-%, more preferably less than 1 wt.-% aluminosilicate builder. It may even be preferred for the composition to be free from aluminosilicate builder.
  • Aluminosilicate builders include zeolite, such as zeolite A, zeolite X, zeolite P and zeolite MAP.
  • the solid laundry detergent composition is essentially free of or free of aluminosilicate, in particular zeolite builder.
  • the spray-dried powder typically comprises 0 to 15 wt.-%, preferably 0 to 12, more preferably from 0 to 3 wt.-% water.
  • the method for determining the moisture level of the solids described herein is described in more detail below.
  • the spray-dried powder further comprises a silicate salt, in particular sodium silicate.
  • Suitable silicate salts include crystalline sodium silicates of the general formula NaMSi x O 2x+1 ⁇ yH 2 O, wherein M represents sodium or hydrogen, x represents an number from 1,9 to 4 and y represents a number from 0 to 20, with x preferably being 2, 3 or 4.
  • Such crystalline silicate salts are, for example, described in the European patent application EP-A-0 164 514 .
  • Particularly preferred are crystalline silicates of the above formula, wherein M represents sodium and x is 2 or 3.
  • Particularly preferred are beta- as well as delta-sodium disilicates of the formula Na 2 Si 2 O 5 ⁇ yH 2 O.
  • amorphous sodium silicates with a module Na 2 O:SiO 2 of 1:2 to 1:3,3, preferably 1:2 to 1:2,8 and more preferably 1:2 to 1:2,6.
  • “Amorphous”, as used herein, includes "X-ray amorphous”, meaning that the silicates in X-ray diffraction measurements do not yield sharp peaks, typical for crystalline substances, but rather one or more broad maxima. Such X-ray amorphous silicates are, for example, described in DE-A-44 00 024 .
  • the silicate salt used in the spray-dried powder may be a light density silicate salt, similar to the silicate salt component b).
  • Such light density silicate salt generally has a bulk density of less than 400g/l, preferably less than 350g/l, or less than 300g/l, or less than 250g/l, or less than 200g/l, or less than 150g/l, or less than 100g/l.
  • the bulk density is in the range of 75 to 150 g/l.
  • the light density silicate salt is a sodium silicate salt, such as those described above.
  • the light density silicate has a weight average particle size of less than 300 micrometers, or less than 200 micrometers, or even less than 100 micrometers. Preferred are weight average particle sizes of 100 micrometers or less.
  • the light density silicate salt is obtainable, or obtained, by a flash-drying process or by spray-drying.
  • the silicate salt content in the spray-dried powder may range from 7 to 20 wt.-%, relative to the total weight of the spray-dried powder.
  • This silicate salt a7) is preferably a light density silicate salt, as defined above and/or comprises, consists essentially of or consists of sodium silicate.
  • the composition comprises, relative to the total weight of the composition, 1 to 25, preferably 1 to 20, more preferably 2 to 15 wt.-% dried light density silicate salt b). It has been found that each 1 wt.-% of the light density silicate salt of a bulk density of about 100 g/l decreases the bulk density of the solid composition by about 20 g/l. "About”, as used herein, relates to the numerical value ⁇ 10%, preferably ⁇ 5%.
  • the dried light density silicate salt may be the light density silicate salt described above.
  • the dried light density silicate salt b) is a flash-dried or spray-dried light density silicate salt and/or has a bulk density in the range of about 75 to about 150 g/L and/or has a water content of less than 5 wt.-%, preferably less than 3 wt.-% and/or has a weight average particle size of less than 300 micrometers, or less than 200 micrometers, or even less than 100 micrometers, and/or comprises, consists essentially of or consists of sodium silicate.
  • adjunct detergent ingredients c may comprise adjunct detergent ingredients c).
  • Suitable adjunct detergent ingredients are selected from: bleaches, in particular a source of peroxygen such as percarbonate salts and/or perborate salts, preferred is sodium percarbonate, the source of peroxygen is preferably at least partially coated, preferably completely coated, by a coating material such as a carbonate salt, a sulphate salt, a silicate salt, borosilicate, or mixtures, including mixed salts, thereof; bleach activator such as tetraacetyl ethylene diamine, oxybenzene sulphonate bleach activators such as nonanoyl oxybenzene sulphonate, caprolactam bleach activators, imide bleach activators such as N-nonanoyl-N-methyl acetamide, preformed peracids such as N,N-pthaloylamino peroxycaproic acid, nonylamido peroxyadipic acid or dibenzo
  • bleaches in particular a
  • the one or more additional components c) are selected from enzymes, perfumes, bleaches, bleach catalysts, complexing agents, and polymers.
  • the processes to prepare the solid laundry detergent compositions described herein include spray drying an aqueous slurry comprising a detersive surfactant, silicate salt, water and optionally a carbonate salt and/or sulfate salt to obtain the spray-dried powder a). All other components present in spray-dried powder a) should also be included in the slurry or may be added afterwards to the spray-dried particles. However, it is preferred that all components a1) to a7), if present, are also included in the slurry, which is subjected to spray-drying.
  • the slurry is preferably an aqueous slurry, with water as the main or only solvent.
  • the spray-drying is preferably carried out by conventional means in a spray-drying tower in a continuous process, all of which are well-known to those skilled in the art.
  • the thus obtained spray-dried powder is in a second step combined with the dried light density silicate salt b) to obtain the solid laundry detergent composition.
  • the spray-dried powder may be introduced in a mixer and the light density silicate salt may be added to said mixer.
  • the mixer may be any suitable mixer known in the art for that purpose.
  • the spray-dried powder and the light density silicate salt are simply combined without excessive mixing to keep mechanical stress low.
  • the light density silicate salt may itself be produced by spray-drying, preferably in a continuous process in a spray-drying tower.
  • the silicate salt is introduced in form of an aqueous slurry into the spray-drying tower.
  • the light density silicate salt may be produced by flash-drying.
  • adjunct components may be added to the spray-dried powder and/or the silicate salt at any stage of the process after spray-drying is completed.
  • a 500 ml graduated cylinder is filled with a powder, the weight of the sample is measured and the bulk density of the powder is calculated in g/l.
  • the following equipment is used:
  • the measurement is carried out indoors at conditions of 20°C temperature, 1013 mbar pressure and a relative humidity of 25%.
  • An aqueous slurry comprising sodium dodecyl benzene sulfonate, dodecyl benzene sulfonic acid, sodium carbonate, sodium silicate, sodium sulfate and carboxymethyl cellulose (CMC) as subjected to a conventional spray drying process to obtain a spray-dried powder with the composition set forth in Table 1 below.
  • Table 1 Spray-dried powder (all amounts in wt.-% relative to total weight of the powder) sodium dodecyl benzene sulfonate 18.3 dodecyl benzene sulfonic acid 19.5 sodium carbonate 13.1 sodium silicate 19.7 sodium sulfate 39.9 carboxymethyl cellulose 0.8 dye 0.02 fluorescent whitening agent 0.13 water Ad 100
  • the solid detergent powder composition 76.25 wt.-% of the spray-dried powder of Table 1 were combined with 2.5 wt.-% dried light density silicate salt (Britesil C201), 15 wt.-% sodium carbonate, 5 wt.-% sodium sulfate, 0,25 wt.-% perfume and 1 wt.-% VFM premix which is a colored version of the spray-dried tower powder according to Table 1.
  • the lump test a powder pellet is pressed. This pellet is exposed an increasing stress (pressure) under certain conditions. The stress at which it breaks is reported as the lump test in grams. More specifically, the test product is filled into a volumetric cup cut to 15 ml. Excess powder is scraped off. The testing product is put into a steel cylinder. A piston is carefully inserted into the stainless steel cylinder while avoiding any compression of the product and charged with a weight of 500 g. After 20 min, the weight is removed, the cylinder is carefully lifted and the product is pushed out of the cylinder. If the pellet falls apart when taking it out of the steel cylinder, the lump test is defined as "0". If the pellet does not fall apart, it is subjected to the lump test.
  • a beam balance is used.
  • the balance has to 1,0g on the scale.
  • the powder pellet is placed beneath the middle of the balance pan with the beaker is pushed up by a lifting platform below the balance pan.
  • the powder pellet has to push the balance pan upwards until the scale shows 0,0g.
  • distilled water is poured slowly and steady into the tared beaker. As soon as the powder pellet starts falling apart the water is stopped.
  • the amount of water used to break the powder pellet is weight back on the balance with the accuracy of +/-1g.
  • the amount of water determined by the procedure above without decimal places is reported as "gram lump test" with reference to this method.
  • Flowability is determined by use of a flowability apparatus that measures the flow of powder over time compared to standard flowing sand material.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Detergent Compositions (AREA)
EP17173958.4A 2017-06-01 2017-06-01 Sprühgetrocknetes pulverreinigungsmittel mit leichtem silikat Withdrawn EP3409752A1 (de)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3959445A (en) * 1973-04-30 1976-05-25 E. I. Du Pont De Nemours And Company Highly absorbent, low bulk density sodium silicate
EP0164514A1 (de) 1984-04-11 1985-12-18 Hoechst Aktiengesellschaft Verwendung von kristallinen schichtförmigen Natriumsilikaten zur Wasserenthärtung und Verfahren zur Wasserenthärtung
DE4400024A1 (de) 1994-01-03 1995-07-06 Henkel Kgaa Silikatische Builder und ihre Verwendung in Wasch- und Reinigungsmitteln sowie Mehrstoffgemische für den Einsatz auf diesem Sachgebiet
DE19828579A1 (de) * 1998-06-26 1999-12-30 Henkel Kgaa Verfahren zur Herstellung von Wasch- und Reinigungsmittelformkörpern
EP2123743A1 (de) 2008-05-14 2009-11-25 The Procter and Gamble Company Feste Waschmittelzusammensetzung mit Silikatsalz mit geringer Dichte

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3959445A (en) * 1973-04-30 1976-05-25 E. I. Du Pont De Nemours And Company Highly absorbent, low bulk density sodium silicate
EP0164514A1 (de) 1984-04-11 1985-12-18 Hoechst Aktiengesellschaft Verwendung von kristallinen schichtförmigen Natriumsilikaten zur Wasserenthärtung und Verfahren zur Wasserenthärtung
DE4400024A1 (de) 1994-01-03 1995-07-06 Henkel Kgaa Silikatische Builder und ihre Verwendung in Wasch- und Reinigungsmitteln sowie Mehrstoffgemische für den Einsatz auf diesem Sachgebiet
DE19828579A1 (de) * 1998-06-26 1999-12-30 Henkel Kgaa Verfahren zur Herstellung von Wasch- und Reinigungsmittelformkörpern
EP2123743A1 (de) 2008-05-14 2009-11-25 The Procter and Gamble Company Feste Waschmittelzusammensetzung mit Silikatsalz mit geringer Dichte

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PQ CORPORATION: "Britesil Silicates: A Family of Multifunctional Soluble Detergent Builders", 1 January 2009 (2009-01-01), pages 1 - 12, XP002773007, Retrieved from the Internet <URL:http://pqcorp.com/Portals/1/docs/Britesil%20Silicates%20brochure,%202009.pdf> [retrieved on 20170815] *

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