ZA200608322B - Granulate for use in a cleaning product and process for its manufacture - Google Patents
Granulate for use in a cleaning product and process for its manufacture Download PDFInfo
- Publication number
- ZA200608322B ZA200608322B ZA200608322A ZA200608322A ZA200608322B ZA 200608322 B ZA200608322 B ZA 200608322B ZA 200608322 A ZA200608322 A ZA 200608322A ZA 200608322 A ZA200608322 A ZA 200608322A ZA 200608322 B ZA200608322 B ZA 200608322B
- Authority
- ZA
- South Africa
- Prior art keywords
- weight
- oligosaccharide
- granulate
- granulate according
- organic
- Prior art date
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- 239000008187 granular material Substances 0.000 title claims description 81
- 238000000034 method Methods 0.000 title claims description 29
- 238000004140 cleaning Methods 0.000 title claims description 21
- 230000008569 process Effects 0.000 title claims description 18
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 239000000463 material Substances 0.000 claims description 40
- 239000000203 mixture Substances 0.000 claims description 39
- 239000002304 perfume Substances 0.000 claims description 37
- 239000004615 ingredient Substances 0.000 claims description 34
- -1 +!" thamnose Chemical compound 0.000 claims description 30
- 239000007844 bleaching agent Substances 0.000 claims description 30
- 239000000047 product Substances 0.000 claims description 30
- 238000005469 granulation Methods 0.000 claims description 26
- 230000003179 granulation Effects 0.000 claims description 26
- 239000004094 surface-active agent Substances 0.000 claims description 20
- 108090000790 Enzymes Proteins 0.000 claims description 18
- 102000004190 Enzymes Human genes 0.000 claims description 18
- 239000011538 cleaning material Substances 0.000 claims description 18
- 239000007787 solid Substances 0.000 claims description 18
- 239000004744 fabric Substances 0.000 claims description 17
- 229920001542 oligosaccharide Polymers 0.000 claims description 17
- 239000003599 detergent Substances 0.000 claims description 16
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- 239000002253 acid Substances 0.000 claims description 15
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- 150000002484 inorganic compounds Chemical class 0.000 claims description 10
- 229910010272 inorganic material Inorganic materials 0.000 claims description 10
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- 239000003352 sequestering agent Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910001388 sodium aluminate Inorganic materials 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- NVIFVTYDZMXWGX-UHFFFAOYSA-N sodium metaborate Chemical compound [Na+].[O-]B=O NVIFVTYDZMXWGX-UHFFFAOYSA-N 0.000 description 1
- IBDSNZLUHYKHQP-UHFFFAOYSA-N sodium;3-oxidodioxaborirane;tetrahydrate Chemical compound O.O.O.O.[Na+].[O-]B1OO1 IBDSNZLUHYKHQP-UHFFFAOYSA-N 0.000 description 1
- 239000002195 soluble material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 150000003890 succinate salts Chemical class 0.000 description 1
- 239000001384 succinic acid Substances 0.000 description 1
- 150000005846 sugar alcohols Chemical class 0.000 description 1
- 125000001273 sulfonato group Chemical group [O-]S(*)(=O)=O 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000002522 swelling effect Effects 0.000 description 1
- 229920001059 synthetic polymer Polymers 0.000 description 1
- 235000020357 syrup Nutrition 0.000 description 1
- 239000006188 syrup Substances 0.000 description 1
- 239000003760 tallow Substances 0.000 description 1
- 235000010487 tragacanth Nutrition 0.000 description 1
- 239000000196 tragacanth Substances 0.000 description 1
- 229940116362 tragacanth Drugs 0.000 description 1
- 235000013311 vegetables Nutrition 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Description
H 1 ’
GRANULATE FOR USE IN A CLEANING PRODUCT AND PROCESS FOR ITS MANUFACTURE
The present invention relates to granulates for use in particulate cleaning products such as laundry wash products, the granulates comprising a temperature sensitive component such as an encapsulated perfume. However, incorporation of other temperature sensitive components is also within the ambit of the present invention. The invention further extends to ... ~~: amethod for making such granulates.
Background of the Invention ~ Several components commonly incorporated in cleaning products are temperature sensitive, such as perfumes, enzymes, bleaches, bleach activators and bleach catalysts. oo By way of example, it is common to incorporate perfumes in cleaning products such as i ‘20 ~ laundry wash products to impart a pleasant or fresh smell to the cleaned item. In the case of particulate wash products, it is known to incorporate the perfume in the form of . microcapsules containing the perfume.
B One method of making such microcapsules is disclosed in US-A-5 066 419. This reference is concerned with detergent compositions which comprise one or more detersive surfactants, optionally one or more builders and perfume particles of the aforementioned kind. These
EE particles are specifically defined as comprising a core having from about 5% to about 50% by "weight of perfume dispersed in from about 95% to about 50% of a “carrier” material of solid fatty alcohol or fatty ester having a molecular weight and melting point. The core is coated with a water-insoluble friable coating. The preferred friable coating is of the urea or melamine plus aldehyde type. The resulting microcapsules have an average particle size
Cn less than about 350 microns, preferably not greater than 150 microns. +1 35 2 Formulation of perfumes in microcapsule form has several advantages. First, perfumes are : by their nature, volatile. Second, if incorporated in a particulate product, there is the risk of
Co wo 20051097962 PCT/EP2005/002467 p 2 loss of perfume efficacy by evaporation. Another reason is the risk of adverse interactions between the perfume and one or more other components in the product. These problems are overcome or at least mitigated by the microencapsulation technique. It also has the advantage that, depending on the form of microcapsule, in use, the possibility is provided for delayed or extended perfume release, for example in the case of deposition on a fabric in a wash liquor containing a detergent composition for fabrics washing.
Probably the oldest and longest used method of formulating particulate cleaning products is spray drying, whereby granules are formed by spraying a slurry of ingredients against a counterblast of warm air. Around the 1980s, the alternative granulation process of mechanical mixing granulation became popular, typically involving mixing to form granules 3 and then densification of the granules so formed. In both cases, additional ingredients, .. especially ingredients which are incompatible with other components of the granule, are ©. sometimes post-dosed either in powder or granule form to the base granule formed by spray drying or mechanical granulation. CL
Cn recent times, flexible manufacture of ranges of different products has involved making pre- granulated. “adjuncts” rich in one or more ingredients such as surfactants or detergency builders or other ingredients such as enzymes or mixtures of such ingredients, then mixing © 20 them with other granulates and/or powdered ingredients according to the particular: oo : formulation required. In accordance with this manufacturing philosophy, it would be useful to ) .... provide adjuncts containing microencapsulated perfume. However, it has been found that 5 - use. of conventional granulation techniques to provide such granulated adjuncts containing y
RRs - microencapsulated perfume leads to problems.
Specifically, it has been found that to granulate perfume microcapsules by spray drying, as taught in US-A-2003/0125222, results in a poor particle size distribution with an undue . proportion of fine material in the product. This is undesirable because of the tendency for : such a product to segregate. The high temperature involved can also damage the microcapsules, leading to perfume loss.
Sugars have been proposed as water-dispersible binders in granules which contain calcite, non-soap surfactant and other optional ingredients commonly found in laundry cleaning products, as disclosed in US-A-4 908 159. The highest level of sugar actually disclosed in _
this reference is 28.6% by weight of sucrose in a granule which additionally contains only calcite and anionic surfactant.
As described in US-A-5 879 920, enzyme containing granules may be made by forming a core comprising a water soluble material coated with a vinyl polymer, covered with an enzyme layer with polyvinyl pyrrolidone and then another polymer outer layer. The core with its polymer coating contains a water soluble or dispersible material which may be inter alia, a sugar or dispersible starch. The core can constitute up to 85% by weight of the entire granule, up to 95% by weight of that core being the water-soluble or water dispersible material. The enzyme-containing layer may comprise from 5% to 70% by weight of the or : entire granule, of which the polymer content may represent from 0.1% to 5%. oo Lower levels of sugars have also been used in the enzyme containing granules disclosed in
EP-A-656 058, in order to improve dispersibility in the wash liquor. 15.
According to US-A-2002/0123449, a highly water-soluble cyclodextrin is granulated with an inorganic compound such as a zeolite or other water soluble or insoluble inorganic
RE detergency builder to form granules which are added to laundry washing powders to reduce oo malodour from fabrics in the wash. The cyclodextrin can be present up to 90% by weight of : © 20 the granule.
The inventors have now discovered that the granules containing sensitive ingredients such as perfume microcapsules can be made using a mechanical granulation technique operating
Cl at.a temperature/energy input low enough not to damage such ingredients by utilising » relatively high levels of an organic water-soluble crystalline solid granulation auxiliary. For the oC t : : avoidance of doubt, the term mechanical granulation technique excludes spray drying but : - oi i does: not preclude a mechanical granulation technique in which one or more of the starting ~~ -
LH materials are themselves the product of a spray-drying process. The term mechanical granulator is to be construed in like fashion.
Another possible advantage of granules according to the present invention is achieving an: appropriate strength of the granules without significant loss of solubility as may occur with inorganic solid granulation auxiliaries. "35 Definition of the Invention oo a WO 2005/097962 PCT/EP2005/002467
A first aspect of the present invention provides a granulate for use in a particulate cleaning product, the granulate consisting of granules which comprise: (a) atleast 30% by weight of granulation auxiliary selected from water-soluble non-acid organic crystalline solids; and (b) at least 0.1% by weight of functional cleaning material other than an enzyme or an inorganic compound; and- (©) optionally, one or more other ingredients.
A second aspect of the present invention provides a granulate for use in a particulate . . cleaning product, the granulate consisting of granules which comprise:
B L (a) at least 20% by weight of granulation auxiliary selected from non-acid water-soluble » “7 organic crystalline solids; and (b) at least 0.1% by weight of temperature sensitive functional cleaning material other : than an enzyme or an inorganic compound; and
LL (©) “optionally, one or more other ingredients.
A third aspect of the present invention provides a method of making a granulate according to "the first or second aspect of the present invention, which method comprises granulating in a mechanical granulator, components (a), (b) and, if present, (c) in a mechanical granulator to form said granules. "25" Detailed Description of the Invention - Particulate cleaning products, as stated above, can comprise granules and/or simple powders. It is common to refer to a particulate laundry wash product as a “washing powder” or “laundry powder”. However, for the sake of clarity, the, following terminology is used throughout this specification, unless explicitly indicated to the contrary. Lo
©. WO 2005/097962 PCT/EP2005/002467
The term “granulate” means a granule comprising a plurality of ingredients, for example having a porous complex microcrystalline structure as can be formed by spray-drying or an agglomerate of individual particles (crystalline or amorphous) which can be formed by spray- drying or by mechanical granulation (typically mixing/densification).
Reference to a “powder” is a reference to a simple collection of individual particles of the same or different compositions, in crystalline and/or amorphous form, which particles have not been agglomerated or formed into a granule in any way.
Reference to a “particulate” is used generically and refers to granules, powders, and mixtures thereof.
Granulates according to the present invention may be used in any particulate cleaning product. However, an especially preferred application is in laundry cleaning products and the following detailed description will concentrate upon these. : .. To-avold any confusion it is noted that the term particulate cleaning product encompasses +77. cleaning products for cleaning and/or conditioning of laundry. Also the term cleaning product and detergent composition are used interchangeably.
The Granulation Auxiliary oo he "The granulation auxiliary consists of one or more water-soluble non-acid organic crystalline solids... :
Preferably these are selected from sugars, especially water-soluble crystalline mono- oligosaccharides and the corresponding sugar alcohols, water soluble polysaccharides and water soluble maltodextrins and glucose syrups, especially those having a dextrose 30.. equivalent. of greater than 2, more preferably greater than 12, dextran and dextran
So derivatives. SR E “ vl +. Particutatly preferred as granulation auxiliary are one of more of the following saccharides: : amylose, isomaltose, isomaltotriose, isomaltotetraose, isomalto oligosaccharide, fructo ~ 35 oligosaccharide, levo oligosaccharide, galacto oligosaccharide, xylo oligosaccharide, gentio oligosaccharide, disaccharides, glucose, dextrose, levose, fructose, galactose, xylose,
SR WO 2008/097962 RE PCT/EP2005/002467 mannose, sorbose, arabinose, rhamnose, fucose, maltose, sucrose, lactose, maitulose, ribose, lyxose, allose, altrose, gulose, idose, talose, trehalose, nigerose, kojibiose, lactulose, oligosaccharides, mailto oligosaccharides, trisaccharides, tetrasaccharides, pentasaccharides, hexasaccharides, oligosaccharides from partial hydrolysates of natural polysaccharide sources and mixtures thereof. E
Acidic organic materials such as (poly)carboxylic acids are excluded from the definition of water-soluble crystalline organic solids which may be used as granulation auxiliary, including polymeric materials having one or more pendant carboxylic acid groups. Salts of such materials with inorganic cations are also excluded. However, any such material may be » ne included as “(c) optional other ingredient(s)".
Preferably, in the context of the present invention, a water-soluble organic water-soluble oC crystalline solid can be considered non-acid if in aqueous solution at 25°C at 1 atmosphere pressure, it has no dissociable hydrogen ion or else has a maximum pKa of at least 6.5.
Reference to “maximum’ pKa is necessary because compounds with more than one carboxylic acid group may have a different pKa value for each. Thus, for example, citric acid oo ... . has. respective pKa values which have been reported as about 3.1, about 4.8 and as a
SIRES highest value; about 5.4 but a value for the last figure as high as 6.4 has also been reported. 200 Nevertheless, citric acid is excluded by the aforementioned definition. oo Preferably, in the context of the present invention, any non-acid organic crystalline solid can be considered water soluble if at 25°C, it has a solubility of at least 1 wt %, more preferably at.least.2 wt %, still more preferably at least 5 wt % (i.e. 100g of a saturated aqueous solution would contain 5g of the dissolved solid and 95g water). oo "| Preferably, in the context of the present invention, a water-soluble non-acid organic solid can : - be considered to be crystalline if it can yield a crystal structure when solidified out of aqueous “solution.
The amount of granulation auxiliary may be 30% by weight or more of the granulate, in the case of the first aspect of the invention, or 20% in the case of the second aspect. The oo minimum level for the first aspect of the invention may even be higher, such as 35% or 40% oo . I. by weight. . In the case of the second aspect, optionally it could be 25%, 30%, 35% or 45% - 3% = ‘by weight. Preferred maximum levels of the auxiliary are 60%, 70%, 80%, 90%, 95% or 99% . byweight
Functional Cleaning Materials
As component (b), essential functional cleaning materials for the second aspect of the present invention and preferred for the first aspect of the present invention are those which are temperature sensitive.
Preferably, a functional cleaning material is “functional” if it conveys any beneficial effect in a wash liquor, be it detergency, bleaching, other soil removal, imparting of a pleasant odour, reducing or enhancing foam levels, inhibiting machine corrosion, promoting fabric care, inhibiting dye damage or transfer of the like. Suitable fabric care promoting ingredients include those for reducing the effects of abrasion in the wash, rebuilding fabric, retaining _ body or shape, anti-wrinkling ingredients, those promoting ease of ironing and fabric . softening materials. Excluded from functional materials included in category (b) of either : 15 : : aspect of the invention are enzymes and inorganic compounds. :
Preferably, a temperature sensitive functional cleaning material is to be regarded as one oo which physically and/or chemically degrades by more than 20% if stored alone on an : exposed inert surface (not in a container) at 50°C for 30 days at 1 atmosphere at 70% relative humidity. oy Preferred. temperature sensitive cleaning material may be selected from one or more of
Co ike surfactants, organic_detergency builders, organic bleaches and organic bleach activators,
ES organic or organometallic bleach catalysts, soil release polymers, fluorescers, anti-dye +25 + .- transfer agents, antifoams and perfumes. ~~ Perfume Microcapsules — SEL De 30. . The grariules according to the first or the second aspect of the present invention preferably . comprise perfume, especially in the form of perfume microcapsules, and most especially at levels more than 1%, preferably more than 3%, more preferably from 10% to 60% by weight : of the perfume microcapsules. Preferably, these are of the kind which comprise a core of carrier material impregnated with a perfume, the impregnated core being coated with a friable coating. Perfumes in general and perfume microcapsules in particular can be
LL WO 2005/097962 PCT/EP2005/002467
Co 8 : considered as functional cleaning materials, especially temperature sensitive functional cleaning materials.
One preferred class of microcapsule comprises those generally of the kind described in US-
A-5066 419. As mentioned above, these comprise a core having from about 5% to about 50% by weight of perfume dispersed in from about 95% to about 50% by weight of a carrier material. This carrier material is a non-polymeric solid fatty alcohol or fatty ester carrier material, or mixtures thereof. The esters or alcohols have a molecular weight of from about 100 to about 500 and a melting point from about 37°C to about 80°C. The alcohols or esters are substantially water-insoluble. The core comprising the perfume and the carrier material Tr - ol are’ coated in a substantially water-insoluble coating on their outer surfaces. Although the : "5 : .. microcapsules recited in US-A-5 066 419 are indicated as having an average particle size oo less than about 350 microns, preferably less than 150 microns, for the avoidance of doubt, in
Lei the context of the present invention, these particles preferably have a dy ; average particle size of from 0.01 to 300p more preferably from 1p to 100y. Similar microcapsules are oo disclosed in US-A-5 154 842 and these are also suitable. . ~ The microcapsules as described in US-A-5 066 419 have a friable coating which is preferably 5 : © an aminoplast polymer. Most preferably, this is the reaction product of an amine selected “from urea and melamine, or mixtures thereof, and the aldehyde selected from formaldehyde, : acetaldehyde, glutaraldehyde or mixtures thereof. Preferably, the coating is from 1 to 30% by weight of the particles. The carrier material preferably comprises an alcohol selected from the C44-C4s alcohols or an ester comprising at least 18 carbon atoms.
However, perfume microcapsules of other kinds are also suitable for use in all aspects of the . a present invention, Ways of making such other microencapsulates of perfume include : os precipitation and deposition of polymers at the interface such as in coacervates, as disclosed oo
Ea in GB-A-751 600, US-A-3 341 466 and EP-A-385 534, as well as other polymerisation routes
Cee such as interfacial condensation, as described in US-A-3 577 515, US-A-2003/0125222, us- . Co
A-6 020 066 and WO-A-03/101606. - Bleaches
I Granulates, according to the first or second aspect of the present invention may containa 35: - bleach for example at levels from 0% to 10%, preferably from 0% to 2% by weight from 0% to 1%, preferably from 0% to 0.1% by weight of a bleach based on the weight of the persalt
I Wo 20051097962 PCT/EP2005/002467 without any water of hydration. However, substantial total exclusion of bleach is especially preferred.
Organic bleaches may fall under the definition of temperature sensitive functional cleaning materials. Inorganic bleaches fall under category (c) namely optional other ingredients, as they are excluded, as inorganic compounds, from category (b).
Suitable inorganic bleaches are persalt bleaches are the alkali metal perborates, percarbonates, perphosphates, persilicates and persulphates. Preferred inorganic persalts are sodium perborate monohydrate and tetrahydrate, and sodium percarbonate. ~ . Especially preferred is sodium percarbonate having a protective coating against Co
Ca destabilisation by moisture. Sodium percarbonate having a protective coating comprising : «sodium metaborate and sodium silicate is disclosed in GB 2 123 044B (Kao). IE 5 3 BE The peroxy bleach compound may be used in conjunction with a bleach activator (bleach precursor) to improve bleaching action at low wash temperatures.
Preferred bleach precursors are peroxycarboxylic acid precursors, more especially peracetic . 20 5 ‘acid precursors and permonanoic acid precursors. Especially preferred bleach precursors -
Je suitable for use in the present invention are N,N,N',N',-tetracetyl ethylenediamine (TAED) and = "sodium nonanoyloxybenzene sulphonate (SNOBS). The quaternary ammonium and phosphonium bleach precursors disclosed in US-A-4 751 015 and US-A-4 818 426 and : ~~ EP-A-402 971, and the cationic bleach precursors disclosed in EP-A-284 292 and EP-A-303 520 (Kao) are also of interest.
The bleach system can be either supplemented with or replaced by a peroxyacid. Examples of such peracids can be found in US-A-4 686 063 and US-A-5 397 501. A preferred example ~~ + isthe imido peroxycarboxylic class of peracids described in EP-A-325 288, EP-A-349 940, Co 30. * DE-A-382 3172 and EP-A-325 289. A particularly preferred example is phthalimido peroxy
Lo caproic acid (PAP). Such peracids are suitably present at 0.1 - 12%, preferably 0.5 - 10%. ;
A bleach stabiliser (transition metal sequestrant) may also be present. Suitable bleach stabilisers include ethylenediamine tetra-acetate (EDTA), the polyphosphonates such as
Dequest m rade Mark) and non-phosphate stabilisers such as EDDS (ethylene diamine. = di-succinic acid). These bleach stabilisers are also useful for stain removal especially in products containing low levels of bleaching species or no bleaching species.
Bleach catalysts, alone or with other bleach components may also be present. An especially preferred bleach system comprises a peroxy bleach compound (preferably sodium percarbonate optionally together with a bleach activator), and a transition metal bleach catalyst as described and claimed in EP-A-458 397, EP-A-458 398 and EP-A-508 787A.
Bleach catalysts which are uncomplexed ligands may be regarded as functional cleaning materials, especiaily temperature sensitive functional cleaning materials. : © Surfactant - ‘Granulates according to the first or second present invention may optionally contain surfactant, for example, higher levels up to 70% or up to 50% by weight or lower levels such 15° as up to 15% or up to 10% by weight of surfactant. Substantially total exclusion of surfactant - isdesifable. =. ~The surfactants may comprise one or more surfactant materials selected from synthetic a detergent (surfactant) agents and soaps. :
In general, suitable surfactants include those generally described in “Surface active agents and. detergents® Vol. | by Schwartz and Perry. If desired, soap derived from saturated or . unsaturated fatty acids having, for example, Co to C,g carbon atoms may also be present. - Anionic “surfactant may actually comprise one or more different anionic surfactant : compounds. Preferred anionic surfactants are alkylbenzene sulphonates, particularly so- called linear alkylbenzene sulphonates having an alky} chain length of Cs-Cy5 -
Additionally or alternatively, other anionic surfactants may be used. Other suitable anionic surfactants are well-known to those skilled in the art. Examples include primary and ; secondary alkyl sulphates, particularly Cg-C45 primary alkyl sulphates; alkyl ether sulphates; - - . a olefin stilphonates; alkyl xylene sulphonates; dialkyl sulphosuccinates; and fatty acid ester oo ‘sulphonates. Sodium salts are generally preferred.
The surfactant may also comprise nonionic surfactant. Nonionic surfactants that may be used include the primary and secondary alcohol ethoxylates, especially the Cg-C,, aliphatic or wo 20051097962 Lo PCT/EP2005/002467 oo alcohols ethoxylated with an average of from 1 to 20 moles of ethylene oxide per mole of alcohol, and more especially the C.-Cis primary and secondary aliphatic alcohols ethoxylated with an average of from 1 to 10 moles of ethylene oxide per mole of alcohol. Non-ethoxylated nonionic surfactants include alkylpolyglycosides, glycerol monoethers, and polyhydroxyamides (glucamide).
Detergency Builders )
Granulates according to the first or second aspect of the present invention preferably a comprise orie or more detergency builders. These may be organic or inorganic. The latter, : as inorganic compounds, are optional category (c) ingredients and cannot form all or part of category (b) ingredients. So . : Preferred inorganic detergency builders are selected from one or more alumino silicates, oo preferably alkali metal, especially sodium alumino silicate.
The alkali metal alumino silicate may be either crystalline or amorphous or mixtures thereof, having the general formula: 0.8-1.5 Na;O. A,Os. 0.8-6 SiO,
These materials contain some bound water and are required to have a calcium ion exchange Ce "capacity of at least 50 mg CaO/g. The preferred sodium alumino silicates contain 1.5-3.5 SiO; oo o units (in the formula above). Both the amorphous and the crystalline materials can be prepared readily by reaction between sodium silicate and sodium aluminate, as amply
R described in the literature. Suitable crystalline sodium alumino silicate ion-exchange detergency builders are described, for example, in GB 1 429 143 (Procter & Gamble). The preferred sodium aluminosilicates of this type are the well-known commercially available +. zedlites A and X, and mixtures thereof. il The zeolite may be the commercially available zeolite 4A now widely used in laundry ~ detergent powders. However, according to a preferred embodiment of the invention, the
Cs = zeolite builder incorporated in the compositions of the invention is maximum aluminium zeolite
P (zeolite MAP) as described and claimed in EP 384 070A (Unilever). Zeolite MAP is defined as an alkali metal alumino silicate of the zeolite P type having a silicon to aluminium ratio not exceeding 1.33, preferably within the range of from 0.90 to 1.33, and more preferably within the.range of from 0.90 to 1.20. | Ce
Co 12
Especially preferred is zeolite MAP having a silicon to aluminium ratio not exceeding 1.07, more preferably about 1.00. The calcium binding capacity of zeolite MAP is generally at least 150 mg CaO per g of anhydrous material.
Other suitable inorganic builders include alkali metal (especially sodium) carbonates, bicarbonates, sesquicarbonates and Burkite, any of which may be used in combination with a seed crystal material such as calcite.
Organic builders that may be present include polycarboxylate polymers such as polyacrylates, acrylic/maleic copolymers, and acrylic phosphinates; monomeric 0 © polycarboxylates such as citrates, gluconates, oxydisuccinates, glycerol mono-, di and
BE trisuccinates, carboxymethyloxy succinates, carboxymethyloxymalonates, dipicolinates, ‘hydroxyethyl imino diacetates, alkyl- and alkenyl malonates and succinates; and sulphonated fatty acid salts. This list is not intended to be exhaustive. : oo j .. Enzymes oo
Ce The granulates according to the invention may also contain one or more enzyme(s).
Suitable enzymes include the proteases, amylases, cellulases, oxidases, peroxidases and lipases usable for incorporation in detergent compositions. Preferred proteolytic enzymes (proteases) are, catalytically active protein materials which degrade or alter protein types of ~ stains. when present as in fabric stains in a hydrolysis reaction. They may be of any suitable origin, such as vegetable, animal, bacterial or yeast origin. BEE
Optional Polymer Material Lo
Co Preferably, but not essentially, granulates according to the first or second aspects of the present invention may comprise a polymer material capable of one or more functions selected from granule binder, agglomerating aid and deposition aid. : so
E i Preferably, such a polymer is selected from synthetic polymers and natural or modified
LL . natural polymers with molecular weights of less than 300,000 KDa, more preferably less than oo 100,000 KDa, still more preferably from 50 KDa to 350 KDa.
Examples of synthetic water soluble polymers of this kind are: (1). polyvinyl pyrrolidone;
ET PCT/EP2005/002467 -
Co 13
EE 2 water soluble celluloses; (3) polyvinyl alcohol; . 4) ethylene maleic anhydride copolymer (5) methyl vinyl ether maleic anhydride copolymer; (6) polyethylene oxides; (7) water soluble polyamide or polyester; : (8) copolymers or homopolymers of acrylic acid such as polyacrylic acid, polystyrene acrylic acid copolymers or mixtures of two or more;
Examples of water soluble hydroxyalkyl and carboxyalkyl celluloses include hydroxyethyl and carboxymethyl cellulose, hydroxyethyl and carboxymethyl celiulose, hydroxymethyl and a. carboxymethyl cellulose, hydroxypropyl carboxymethyl cellulose, hydroxypropyl methyl oo ne carboxyethyl! cellulose, hydroxylpropyl carboxypropyl cellulose, hydroxybutyl carboxymethyl
EB cellulose, ‘and the like. Also useful are alkali metal salts of these carboxyalkyl celluloses, 15. particularly and preferably the sodium and potassium derivatives.
Examples of water soluble natural and modified natural polymers are starch, gums and gelatine. Modified starch in its myriad of forms, including dextrins, is useful within the
RE invention, as well as hydrolyzed gums and hydrolyzed gelatine. Various modified starches are described in US-A-2 876 160. :
Co ‘Suitable hydrolyzed gums include gum Arabic, larch, pectin, tragacanth, locust bean, guar, alginates, carrageenans, cellulose gums such as carboxy methyl cellulose and karaya.
Appropriate modified starches have a dextrose equivalent of 0.25 up to about 20, preferably
Sto 15. i} oe A wide range of starch hydrolysates having dextrose equivalents of up to 95 are also useful, © Until recently these starch hydrolysates, also called maltodextrins and dextrins were - produced from various starches by acid hydrolysis. The hydrolysates resulting from this acid . ~~ process are not completely soluble in water, and contain native starch. Suitable starches are derived from corn, waxy maize, tapioca, etc. k *- Preferably, the granules contain up to 30%, preferably from 1% to 20% by weight of such. polymer material. SIE
Optional Solid Water Insoluble Inert Carrier Material
Preferably, compositions according to the first or second aspects of the present invention also contain a water-insoluble solid inert carrier material. Preferably, this is selected from alumina, magnesium silicate, calcium silicate, magnesium hydroxide, barium sulphate, silica, ‘ aluminosilicates such as zeolites, and minerals such as clay or calcium carbonate, calcite and mixtures thereof. It will be appreciated that some of these materials are also functional in the sense that they are water-insoluble detergency builders.
Preferably, the amount of the water-insoluble inert carrier material in the granules is up to . 70%, preferably from 10% to 50% by weight of those granules. :
Other Optional Ingredients
Granulates according to the first or second aspects of the present invention optionally
B contain component (c), namely one or more other ingredients than components (a) and (b). .. The total amount of these other materials is preferably no more than 50%, more preferably . no more than 40%, still more preferably no more than 20%, especially no more than 10%, by Co weight of the granulate.
Compositional Applications
Sh Any granulate according to the first or third aspect of the present invention may be : incorporated in a detergent composition comprising one or more post dosed materials, granular and/or powdered. Optionally, any detergent composition according to any aspect of . the present invention may be compressed into tablet form by known technique, e.g. such a tablet also comprising a disintegrant. Such a tablet constitutes a further aspect of the ; invention. Optionally, and also constituting an aspect of the invention, is the inclusion of such a granular and/or powdered composition in a water soluble or dispersible sachet or pouch. :.
Any. such composition contains at least one ingredient selected from surfactant and softening .
Co } material, optionally also detergency builder and optionally also, one or more other ingredients - or ‘commonly found in detergent compositions. Typical such ingredients are any of recited hereinbefore as essential ingredients of granulates according to the first or third aspects of oo the present invention.
CT WO 20050097962 PCT/EP2005/002467 oo 15
In such a composition for laundry use, it is preferred that if present the level of any linear alkylbenzene sulphonate surfactant is from 0 wt% to 30 wt%, more preferably 1 wt% to 25 wt%, most preferably from 2 wt% to 15 wt%.
It is also preferred that if present, the level of any nonionic surfactant is from 0 wt% to 30 wt%, more preferably from 1 wt% to 25 wt%, most preferably from 2 wt% to 15 wt%.
Detergency builders may generally be incorporated in amounts of from 10 to 70% by weight (anhydrous basis), preferably from 25 to 50 wt%. Preferred detergency builders are alkali
CL metal, preferably sodium, aluminosilicate builder. + Especially preferred organic builders are the citrates, suitably used in amounts of from 5to 30 - Wt%, preferably from 10 to 25 wt%; and acrylic polymers, more especially acrylic/maleic - 16 copolymers, suitably used in amounts of from 0.5 to 15 wt%, preferably from 1 to 10 wt%.
Any peroxy bleach compound is suitably present in an amount of from 0.1 to 35 wt%, : preferably from 0.5 to 25 wt. Any bleach precursor is suitably present in an amount of from 0.1 : to 8 wt%, preferably from 0.5 to 5 wt%. cnt
Detergency enzymes are commonly employed in granular form in amounts of from about 0.1. to about 3.0 wt%. However, any suitable physical form of enzyme may be used. " : The term softening material is used herein for purposes of convenience to refer to materials
EES : 25 which provide softening and/or conditioning benefits to fabrics in the wash cycle of a home or . automatic laundering machine or in a manual wash process. oo
IRR | : “When. the detergent composition according the invention comprise softening material, the oo compositions preferably comprise from 10 to 95% by weight of softening material (active wr - 30 ingredient), based on the total weight of the composition, more preferably 15 to 75% by weight, most preferably 20 to 50% by weight, e.g. 22 to 45% by weight.
The softening material comprises preferably at least one cationic softening material such as quatemnary ammonium fabric softening material. Preferably the quatemary ammonium fabric 35. softening material has two C12-28 alkyl or alkenyl groups connected to the nitrogen head
©. WO 2005/097962 PCT/EP2005/002467
SRE 16 group, preferably via at least one ester link. It is more preferred if the quaternary ammonium material has two ester links present.
Preferably, the average chain length of the alkyl or alkenyl group is at least C14, more preferably at least C16. Most preferably at least half of the chains have a length of C18.
It is generally preferred that the alkyl or alkenyl chains are predominantly linear.
Especially preferred materials are di-alkenyl esters of triethanol ammonium methyl sulphate and N-N-di(tallowoyloxy ethyl) N,N-dimethyl ammonium chloride. Commercial examples : include Tetranyl AHT-1 (di-hardened oleic ester of triethanol ammonium methyl sulphate 80% active), AT-1(di-oleic ester of triethanol ammonium methyl sulphate 90% active), 15/90 (palm ester of triethanol ammonium methyl sulphate 90% active), all ex Kao™. Other : : unsaturated quaternary ammonium materials include Rewoquat™ WE15 (C10-C20 and C16- - 15" C18 unsaturated fatty acid reaction products with triethanolamine dimethyl sulphate quaternised 90 % active), ex Witco™ Corporation.
Co Other preferred materials include 1,2 bis[tallowoyloxy]-3- trimethylammonium propane chloride and 1,2-bis[oleyloxy]-3-trimethylammonium propane chloride, the method of preparation thereof are, for example, described in US 4137180 (Lever Brothers) of which the . contents are incorporated herein. Preferably these materials also comprise small amounts of -, the corresponding monoester, as described in US 4137180.
When the detergent composition is to be used as a solid rinse conditioner, the granulate may be used in a composition as described in WO03/083027. Other examples of suitable solid rinse conditioners are described in EP-A-0 234 082, EP-A-0 111 074, EP-A-0 111 074, WO + 9218593, EP-B1-0 568 297, US-A-5 269 964, EP-A-0 107 479 (Unilever), EP-A-0 267 999 : ) (Unilever), JP-A-06 306 769, JP-A-62 057 639 (Lion), JP-A-02 182 972, US-A-4 814 095, ‘GB-A2348435. EE g nN Another class of softening materials are fabric softening clays. In particular those that co- operate with the organic fatty softener materials to provide enhanced softening of laundry.
SE Such clays include the montmorillonite- containing clays which have swelling properties (in water) and which are of smectite structure. The best of the smectite clays for use in the present invention is bentonite and the best of the bentonites are those which have a : substantial swelling capability in water, such as the sodium and potassium bentonites. Other bentonites, such as calcium bentonite, are normally non-swelling and usually are, in themselves, unacceptable as fabric softening agents.
However, it has been found that such non-swelling bentonites exhibit even better fabric softening in combination with organic fatty softener materials than do the swelling bentonites, provided that there is present in the softening composition, a source of alkali metal or other solubilising ion, such as sodium (which may come from sodium hydroxide, added to the composition, or from sodium salts, such as builders and fillers, which may be functional components of the composition). Among the preferred bentonites are those of sodium and potassium, which are normally swelling, and calcium and magnesium, which are normally --- non-swelling. Of these it is preferred to utilise calcium (with a source of sodium being present) and sodium bentonites. Also, other montmorillonite-containing smectite clays of properties like those of the bentonites described may be substituted in whole or in part for the
BE benitonites described herein and similar fabric softening results will be obtained. :
A detailed description of the process for treating bentonite in accordance with the present : ~ invention is disclosed in WO 00/03959 filed in the name of Colin Stewart Minchem, Ltd., the disclosure of which is incorporated herein by reference. o o A main.component which may be used in combination with the fabric softening clay is an ~~ organic. fatty softener. The organic softener can be anionic, cationic or nonionic fatty chains
ERE (C10 C22 preferably C12 -C18) Anionic softeners include fatty acids soaps. Preferred organic softeners are nonionics such as fatty esters, ethoxylated fatty esters, fatty alcohols and polyols polymers. The organic softener is most preferably a higher fatty acid ester of a pentaerythritol compound, which term is used in this specification to describe higher fatty a acid esters of pentaerythritol, higher fatty acid esters of pentaerythritol oligomers, higher fatty acid esters of lower alkylene oxide derivatives of pentaerythritol and higher fatty acid esters: - of lower alkylene oxide derivatives of pentaerythritol oligomers. : Pentaerythritol compound, abbreviated as PEC herein, which description and abbreviation "+. may apply to any or all of pentaerythritol, oligomers, thereof and alkoxylated derivatives thereof, as such, or more preferably and more usually, as the esters, as may be indicated by: thecontext oo 35. “The oligomers. of pentaerythritol are preferably those of two to five pentaerythritol moieties, + more preferably 2 or 3, with such moieties being joined together through etheric bonds. The rt WO Sh0S0T6L PCT/EP2005/002467 = , 18 . lower alkylene oxide derivatives thereof are preferably of ethylene oxide or propylene oxide monomers, dimers or polymers, which terminate in hydroxyls and are joined to the pentaerythritol or oligomer of pentaerythritol through etheric linkages. Preferably there will be : one to ten alkylene oxide moieties in each such alkylene oxide chain, more preferably 2 to 6, and there will be one to ten such groups on a PEC, depending on the oligomer. At least one of the PEC OH groups and preferably at least two, e.g., 1 or 2 to 4, are esterified by afhigher fatty acid or other higher aliphatic acid, which can be of an odd number of carbon atoms.
The higher fatty acid esters of the pentaerythritol compounds are preferably partial esters.
And more preferably there will be at least two free hydroxyls thereon after esterification (on the pentaerythritol, oligomer or alkoxyalkane groups). Frequently, the number of such free hydroxyls is two or about two but sometimes it may by one, as in pentaerythritol tristearate.
The higher aliphatic or fatty acids that may be employed as esterifying acids are those of carbon atom contents in the range of 8 to 24, preferably 12 to 22 and more preferably 12 to 18, e.g., lauric, myristic, palmitic, oleic, stearic and behenic acids. Such may be mixtures of oo such fatty acids, obtained from natural sources, such as tallow or coconut oil, or from such _ natural air materials that have been hydrogenated. Synthetic acids of odd or even numbers of carbon atoms may also be employed. Of the fatty acids lauric and stearic acids are often ~ preferred, and such preference may depend on the pentaerythritol compound being esterified. Co
Examples of suitable detergent compositions containing clay include those described in US-
N ~~ A6291421 and US-A- 6 670 320.
The Process “According to the second and fourth aspects of the present invention, granulates according tor : the present invention can be manufactured by means of a mechanical mixing granulation process. Such processes are well known in the art. They include the so-called fluid (e.g. : fluidized :bed) granulation techniques. These mechanical mixing granulation processes do
IEE “not involve spray drying to form the granule but one or more of the starting materials may optionally be spray-dried granules. )
In .the ) apparatus of choice, if the functional cleaning material comprises perfume
Co microcapsules, these can be applied in the form of a suspension (slurry). Typically, this comprises from 10% to 80% by weight of the perfume microcapsules and from 20% to 90% by weight of water. Optionally, other ingredients may be included in the slurry, for example from 0% to 40% by weight of a polymeric material to impart deposition or other beneficial properties. Suitable such polymeric materials are any one or more of those previously § recited as examples of “optional polymer materials”.
When surfactant is included in the form of anionic surfactant, this can be added in the form of the salt (typically sodium salt) of the organic anion, or it may be made in situ by admixture of the liquid precursor of an anionic surfactant and a neutralising agent such as sodium carbonate, although this is generally less preferred. - Co Brief details of suitable granulating apparatus will now be given.
A process according to the third aspect of the present invention may be carried out in either batch or continuous mode of operation as desired. Co ~The process of the invention is preferably camied out in a mechanical granulator, most . preferably a low- or moderate shear machine. A low- or moderate-shear mixer/ granulator
Ce often has.a stirring action. and/or a cutting action which are operated independently of one another. Preferred types of low- or moderate-shear mixer granulators are mixers of the :
Loedige KM series, Gericke GCM series (respectively from Loedige Germany and Gericke
Powder Processing Equipment and Systems, Switzerland) Fukae® FS-G series; Diosna® V series ex Dierks & Sohne, Germany; Pharma Matrix? ex. T.K. Fielder Ltd, England. Other - N mixers which are suitable for use in the process of the invention are Fuji” VG-C series ex Fuji -« Sangyo Co., Japan; the Roto® ex Zanchetta & Co. si, Italy, Schugi® Flexomix granulator, ex : a. - Hosokawa Netherlands and Eirich Intensivmischer, Eirich Germany. :
Another possible low shear granulator is one of the gas fluidisation type, which comprises a fluidisation zone in which the liquid binder is sprayed into or onto the solid neutralising agent.
However, a low shear bowl mixer/granulator can also be used. When the low shear granulator is of the gas fluidisation kind it may sometimes be preferable to use equipment of the kind provided with a vibrating bed. This may be preferable if the perfume loading of the slurry. is to be low and when drying is required. Gentle heating of the fluidisation air is * +. preferred to avoid premature perfume release.
co WO 2005/097962 PCT/EP2005/002467
SE 20 "i the low-shear granulator is of the gas fluidisation kind, then the liquid binder can be sprayed from above and/or below and/or within the midst of the fluidised material.
If a gas fluidisation granulator is used as the low-shear granulator, then preferably it is operated at a superficial air velocity of about 0.1-2.0 ms™, either under positive or negative relative pressure and with an air inlet temperature ranging from —10° or 5°C up to 80°C, or in some cases, up to 200°C. An operational temperature inside the bed of from ambient temperature to 60°C is typical. Depending on the process, it may be advantageous to vary the temperature (upwardly and/or downwards, during at least part of the process).
It is also possible to granulate the ingredients first in a high shear mixer such as a Loedige C : series recycler and then in a moderate or low shear mixer, especially of fluid bed type with
Co bh optional drying and cooling. Any temperature sensitive ingredient(s) can be added in either : ; - mixer or in both but preferably, at least 50% by weight of each or of all of such ingredients } is/are added in the low or moderate shear mixer.
Granule Size and Density
Granulates according to the present invention may preferably have a dy; average particle diameter.of from 100 microns to 2,000 microns, preferably from 500 microns to 700 microns. -Granulates according to the present invention preferably have a relating narrow particle size
R distribution, for example having no more than 10%, preferably no more than 5% by weight of E oo particles below 250 microns diameter and no more than 10%, preferably no more than 5% by weight of particles above 1,400 microns diameter.
Granulates according to the first and third aspects of the invention, especially those made by - " methods according to the second and fourth aspects of the present invention, preferably
Co > ‘have a bulk density of at least 5509/1, more preferably at least 600g, eg at least 700g/1 and 30... preferably, no more than 1800g/l, more preferably no more than 1200 g/i and for example, no +4 more than 900g.
The present invention will now be explained in more detail by way of the following non- limiting examples. a
CT : 21 33 g of sugar and 67 g of zeolite was blended together in a Moulinette for 2 minutes.
Thereafter 30 g of melamine-capsule slurry was added in batches of 5 g with thorough mixing in the Moulinette for about 60 seconds after every addition. The agglomerated mass was then transferred to a Retsch fluidized bed and dried using ambient air for 10 minutes.
The resulting powder was sieved between 180 and 1400 microns to give a free flowing powder with excellent solubility but low friability and which has no segregation risk when added to a standard detergent powder.
Claims (1)
- : . A. . 22 . CLAIMS SE A granulate for use in a particulate cleaning product, the granulate consisting of granules which comprise: (a) at least 30% by weight of granulation auxiliary selected from water-soluble non-acid organic crystalline solids; and (b) at least 0.1% by weight of functional cleaning material other than an enzyme or an SE inorganic compound; and =10 . (c) optionally, one or more other ingredients. -2. A granulate according to claim 1, wherein the functional cleaning material is selected from one or more of surfactants, organic detergency builders, organic bleaches, organic bleach activators, organic and organometallic bleach catalysts, soil release polymers,15. fluorescers, fabric care agents, anti-dye transfer agents, antifoams and perfumes. : RE 3. | A granulate according to claim 1 or claim 2, wherein the functional cleaning material comprises an encapsulated perfume. :20. 4. A granulate according to any preceding claim, wherein said optional one or more co other ingredients comprise one or more of enzymes and inorganic compounds.5. A granulate according to any preceding claim, wherein the granulation auxiliary is - selected from one of more of the following saccharides: amylose, isomaltose, isomaltotriose, isomaltotetraose, isomalto oligosaccharide, fructo oligosaccharide, levo oligosaccharide, Co galacto- oligosaccharide, xylo oligosaccharide, gentio oligosaccharide, disaccharides, glucose, dextrose, levose, fructose, galactose, xylose, mannose, sorbose, arabinose, +!" thamnose, fucose, maltose, sucrose, lactose, maltulose, ribose, lyxose, allose, altrose,23 Co gulose, idose, talose, trehalose, nigerose, kojibiose, lactulose, oligosaccharides, mailto oligosaccharides, trisaccharides, tetrasaccharides, pentasaccharides, hexasaccharides, oligosaccharides from partial hydrolysates of natural polysaccharide sources and mixtures thereof.5 .6. A granulate according to any preceding claim, comprising from 30% to 95%, . preferably from 30% to 70% by weight of the granulation auxiliary. SE A | A granulate for use in a particulate cleaning product, the granulate consisting of granules which comprise: (a) at least 20% by weight of granulation auxiliary selected from non-acid water-soluble organic crystalline solids; and = 7 (b) at least 0.1%. by weight of temperature sensitive functional cleaning material other Coe -than an enzyme or an inorganic compound; and _ © h optionally, one or more other ingredients.8." A granulate according to claim 7, wherein the temperature sensitive functional: “*' cléaning' material is selected from organic bleaches, bleach catalysts, and perfumes. 20° 9. A granulate according to claim 7 or claim 8, wherein the temperature sensitive functional cleaning material comprises an encapsulated perfume. " ’ 10; = A granulate according to any of claims 7 to 9, wherein said optional one or more other ingredients comprise one or more of enzymes and inorganic compounds. :25. '11. A granulate according to any of claims 7 to 10, wherein the granulation auxiliary is selected from one of more of the following saccharides: amylose, isomaltose, isomaltotriose,CWO 2005/097962 PCT/EP2005/002467 Le 24 isomaltotetraose, isomalto oligosaccharide, fructo oligosaccharide, levo oligosaccharide, galacto oligosaccharide, xylo oligosaccharide, gentio oligosaccharide, disaccharides, glucose, dextrose, levose, fructose, galactose, xylose, mannose, sorbose, arabinose, rhamnose, fucose, maltose, sucrose, lactose, maltulose, ribose, lyxose, allose, altrose, gulose, idose, talose, trehalose, nigerose, kojibiose, lactulose, oligosaccharides, malto oligosaccharides, trisaccharides, tetrasaccharides, pentasaccharides, hexasaccharides, oligosaccharides from partial hydrolysates of natural polysaccharide sources and mixtures thereof. - 10, 12: pes A: granulate according to any of claims 7 to 11, comprising from 20% to 95%, -i. | ‘preferably from 30% to 70% by weight of the granulation auxiliary. ~~ 13. A process of manufacturing a granulate according to any preceding claim, for usein a particulate cleaning product, the process comprising granulating in a mechanical granulator, components (a), (b) and (c) to form said granules. - : 14. “A’detergent composition comprising a granulate according to any one of claims 1 to © 12, from 0 wt% to 30 wit% of a linear alkylbenzene sulphonate surfactant and from 10 to 70% : by weight of a detergency builder by weight of the total particulate cleaning product.15. A detergent composition comprising a granulate according to any one of claims 1 to 12 and from 10 to 95% by weight of softening material by weight of the total particulate © cleaning product. Lo
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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EP04076130 | 2004-04-09 |
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Family Applications (1)
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ZA200608322A ZA200608322B (en) | 2004-04-09 | 2005-03-07 | Granulate for use in a cleaning product and process for its manufacture |
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2005
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