EP1845153A1 - Tablettes détergentes - Google Patents

Tablettes détergentes Download PDF

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Publication number
EP1845153A1
EP1845153A1 EP06075874A EP06075874A EP1845153A1 EP 1845153 A1 EP1845153 A1 EP 1845153A1 EP 06075874 A EP06075874 A EP 06075874A EP 06075874 A EP06075874 A EP 06075874A EP 1845153 A1 EP1845153 A1 EP 1845153A1
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EP
European Patent Office
Prior art keywords
smooth
tablet
phase
preferred
region
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EP06075874A
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German (de)
English (en)
Inventor
Bernardus Johannes c/o Unilever R&D Den Boogert
Pieter Everhardus M. c/o Unilever R&D Overdevest
Marinus Maria Cornelis Gerardus Warmoeskerken
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Unilever NV
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Unilever NV
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Priority to EP06075874A priority Critical patent/EP1845153A1/fr
Publication of EP1845153A1 publication Critical patent/EP1845153A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • C11D17/0047—Detergents in the form of bars or tablets
    • C11D17/0065—Solid detergents containing builders
    • C11D17/0073—Tablets
    • C11D17/0078—Multilayered tablets

Definitions

  • the present invention relates to cleaning compositions in the form of tablets for use in fabric washing or machine dishwashing.
  • Detergent compositions in tablet form have advantages over powdered products in that they do not require measuring and are thus easier to handle and dispense into the wash load.
  • Tablets of a cleaning composition are generally made by compressing or compacting a quantity of the composition in particulate form.
  • WO 01/42416 describes the production of multi-phase moulded bodies comprising a combination of core moulded bodies and a particulate premix.
  • WO 00/61717 describes a detergent tablet which is characterised in that at least part of its outer surface is semi-solid.
  • WO 00/04129 describes a multi-phase detergent tablet comprising a first phase in the form of a shaped body having at least one mould therein and a second phase in the form of a particulate solid compressed within said mould.
  • WO 99/24549 describes a detergent tablet comprising a compressed solid body and a non-compressed gelatinous portion mounted in a mould of said body.
  • WO99/27069 relates to a tablet comprising a compressed and a non-compressed phase, wherein the non-compressed phase improves stability of perfume components.
  • prior publications on form stable, solid, and/or transparent smooth or gel-like detergent compositions.
  • GB 1578289 such a composition comprising soap, detergent and solvent has been proposed, for detergent sticks for use in wash or dry-cleaning pretreatment.
  • EP 1,371,719 EP 1,405,900
  • EP 1,382,668 EP 1,375,636
  • EP 1,405,901 , EP 1,405,902 , EP 1,418,224 and WO 03/104380 to prepare tablets comprising a smooth or semi-solid phase.
  • a problem with cleaning tablets comprising a smooth phase such as for example a melt-casted, semi-solid, non-compressed or gel-like phase is often that these phases show a slow dissolution behaviour e.g. when used in a laundry washing machine.
  • Another problem with cleaning products comprising a smooth phase is that sometimes the smooth phase sticks to the packaging material, possibly resulting in damage to the smooth part or the packaging material when unpacking the cleaning tablet.
  • Another problem with cleaning tablets comprising a smooth phase is that some users do not like the feeling or touch of these tablets and that it is sometimes desirable to minimise contact between the user and the smooth part of the tablet.
  • the invention provides a multi-phase cleaning tablet comprising a smooth phase, wherein the smooth phase comprises at least three protruding elements having a height of from 1.0 to 7.5 mm.
  • Tablets of the invention comprise a smooth phase or region.
  • smooth phase refers to compositions which are on the one hand solid enough to retain their shape at ambient temperature and on the other hand smooth in appearance.
  • Smooth textures can for example be semi-solid, non-compressed, gel-like or melt-casted as described above. Smooth textures are generally of low or no porosity and have -at normal viewing distance- the appearance of a continuous phase for example as opposed to porous and particulate appearance of a compacted particulate material.
  • the cleaning tablets of the invention are multi-phase tablets wherein at least one of the phases is preferably a smooth phase in the form of a layer.
  • the tablet or the first region of the multi-phase tablet is both a smooth region and a semi-solid region.
  • semi-solid refers to compositions which are on the one hand solid enough to retain their shape at ambient temperature but which are neither completely solid. A suitable test to check if a composition can be considered as semi-solid is for example described in EP1,375,636 .
  • the other regions of the cleaning tablet are possibly separate layers within a tablet, preferably substantially flat layers.
  • the smooth region covers a substantial part of the upper surface of the other region, e.g. preferably at least 65%, more preferred at least 75%, most preferred more than 90% or even substantially all of the upper surface of the other region is covered by the first smooth region.
  • the term upper surface refers to one of the main sides of the cleaning tablet which by placing the tablet on a flat surface could be classified as the upper surface.
  • the other region of the tablet is a layer of compacted particulate material, preferably having a substantially flat upper surface.
  • the first smooth region is a layer having an average thickness of from 0.5 to 10 mm, more preferred 1 to 6 mm, for example 1.5 to 5 mm.
  • the total weight the smooth region is from 1 to 40 grams, more preferred from 3 to 30 grams, most preferred from 4 to 10 Grammies, preferably the level of non-soap surfactants in the smooth region is from 0.5 to 10 grams, more preferred from 1 to 7 grams.
  • the outer surface of the smooth phase comprises at least three, more preferably from 3 to 25 protruding elements each having a height (h) of at least 1.0 mm, more preferred from 1.0 to 7.5 mm such as 1.5 to 6 mm, most preferred from 2 to 5 mm.
  • the protruding elements each have a breadth of at least 1.0 mm, for example from 1.0 to 20 mm, more preferred from 2.0 to 10 mm, most preferred from 3.0 to 7 mm.
  • protruding element refers to parts of the smooth phase which generally have substantially the same composition as the remaining part of the smooth phase, but which preferably protrude from the outer surface of the cleaning tablet.
  • the outer surface of the tablet may be either the upper surface of the tablet, or the lower surface of the tablet, or the upper and the lower surface of the tablet.
  • the protruding elements constitute from 10% to 80%, more preferred from 20% to 80%, for example from 30% to 80%, of the upper surface of the cleaning tablet.
  • the breadth of the protruding element can for example be determined by measuring the top to top distance between two adjacent protruding elements.
  • the breadth of the protruding element may also be determined by measuring the shortest distance between two of the highest points on the protruding element.
  • the height of a protruding element can be determined by measuring the difference in height between the highest and the lowest point of an element.
  • the breadth of each protruding element is from 1.0 to 5.0 times its height, more preferably from 1.3 to 4.0 times its height, most preferably from 1.5 to 3 times its height.
  • the protruding element(s) can be of any suitable shape e.g. in the form of protruding dots (such as for example illustrated in figure 5), protruding squares, protruding shapes, logos, letters etc.
  • the protruding elements are in the form of ridges, especially rounded ridges for example in the form of elongated elements present on the outer surface of the smooth phase.
  • Protruding elements may have any profile shape, for example rectangular ridges (for example as illustrated in fig 4a) or triangular ridges (for example as illustrated in fig 4b). Particularly preferred is the presence of rounded protruding ridges (for example as illustrated in figures 1, 2, 5 and 6), particularly rounded ridges whereby the term rounded refers to a -preferably elongated- profile element having a curved outer surface and which is preferably free from sharp angles or edges.
  • the ridges may have any suitable form, however preferably each of the ridges is of uniform height and breadth along its (elongated) dimension. Also preferably the ridges are in close proximity to each other, whereby the breadth of each ridge is 1.5 to 4 times its height. Most preferably the ridges are touching each other such as for example illustrated in figures 1 and 2.
  • the number of protruding elements is at least three, preferably from 3-25, more preferred from 4-15, most preferred from 5-10.
  • a tablet of circular shape comprising a number (preferably 3-10, most preferably 4-8) ridges in the form of concentric circles (as illustrated in figure 1).
  • the tablet is of rectangular shape and the ridges are present as from 3-15, more preferred 5-14 parallel ridges which are orientated parallel to at least one side of the tablet (for example as illustrated in figure 2).
  • the height of each ridge is from 1.0 to 4 mm, more preferred from 1.5 to 3 mm.
  • the breadth of each ridge is from 2.0 to 6.0 mm, more preferred from 3.0 to 5.0 mm.
  • Figure 1 shows a preferred embodiment of a cleaning tablet of the invention whereby figure 1a shows a top-view and figure 1b shows a cross-section over the diameter d-d'.
  • the cleaning tablet consists of a first layer (4) of compacted material on top of which is a second layer (5) of smooth material.
  • the smooth material is arranged in the form of 6 concentric, circular rounded ridges 7 each having a breadth b and a height h.
  • Figure 2 shows another embodiment of the invention whereby figure 2a shows a view of the cleaning tablet from above and figure 2b shows a cross-section over the line p-p'.
  • the cleaning tablet consists of a first layer of compacted material (8) on top of which is a second layer (9) of smooth material.
  • the smooth material is arranged in the form of 11 parallel rounded ridges each having a breadth b and a height h.
  • Figure 3 shows a cross-section of a mould arrangement for preparing a smooth part for use according to the present invention.
  • a mould arrangement for manufacturing a tablet part in accordance with the process according to the present invention comprises a mould 1, under which is situated a piston 3.
  • Reference number 5 depicts a smooth part of a laundry cleaning tablet.
  • the mould 1 comprises a peripheral wall 7, which is ring shaped and bounds a space 9.
  • the space 9 is bridged by a diaphragm 11.
  • the peripheral wall comprises two parts.
  • the first is an annular support ring 13 having L-shaped cross-section.
  • the support ring 13 is made of aluminium.
  • Received within this L-shaped support ring 13, is a silicone rubber insert 15 which comprises the diaphragm 11 and integral therewith, an annular peripheral support 17 therefor.
  • the silicone rubber has a shore hardness in the range 40 - 55.
  • the peripheral support is wall comprising the support ring 13 and the peripheral support 17.
  • the space 9 within the peripheral wall 7 is divided by the diaphragm 11 which joins the peripheral support 17 at a position approximately 1/3 of the distance between the upper rim 19 and the lower rim 21 of the peripheral wall 7.
  • the diaphragm 11 is provided with a profile substantially corresponding to the forming of a number of circular rounded ridges for the smooth part as illustrated in figure 1 (not shown).
  • the space 9 divided by the diaphragm 11 thereby provides an upper cavity 23 above the diaphragm 11 and a lower cavity 25 below the diaphragm.
  • the diaphragm 11 is slightly bowed so as to be concave when viewed from above, into the upper cavity 23.
  • a molten composition is poured into the upper cavity 23 and allowed to cool to ambient temperature whereupon, it adopts a semi-solid smooth consistency to form the tablet parts.
  • the tablet part formed in this way is ejected by action of the piston 3, which sits within the lower cavity 25, being moved upwardly to distort the diaphragm 11 so that it becomes flat and/or convex when viewed from the direction of the upper cavity 23.
  • the tablet part is thereby ejected and conveyed away.
  • the mould can then be refilled in the same way for repeat use.
  • the side wall 27 of the upper cavity 23, which side wall is defined by an inner surface of the peripheral support 17, adjacent to the upper rim 19, is outwardly angled relative to the axis of symmetry 29 of the mould, such as to make an angle ⁇ which is approximately 10° to the vertical.
  • Figure 4A shows a cross-section of a rectangular cleaning tablet comprising a phase of compacted particulate material (40) and a smooth phase 41 which comprises 6 elongated rectangular ridges orientated parallel to and along the entire side of the tablet (not shown).
  • the ridges constitute about 55% of the upper surface of the tablet.
  • Figure 4B shows a cross-section of a rectangular cleaning tablet comprising a phase of compacted particulate material (40) and a smooth phase composed of 6 triangular elongated ridges orientated parallel to one side of the tablet.
  • the ridges cover about 90% of the upper surface of the tablet.
  • Figure 5A shows a top view of a circular cleaning tablet comprising a smooth phase which is constituted by 13 protruding dots covering about 40% of the upper surface of the cleaning tablet.
  • Figure 5B shows a cross-section of the tablet of figure 5A along the line K-K'.
  • the tablet has a phase of compacted particulate material (44) on top of which is a smooth phase constituted by rounded circular protruding dots (45).
  • Figure 6 shows a top-view of a cleaning tablet comprising a first layer of compacted particulate material (not shown) on top of which is a smooth phase in the form of a single spiral-shaped protruding element formed by a single elongated rounded strand of smooth material.
  • the cross-section along line d-d' is similar to the cross-section along d-d' in figure 1A.
  • the number of protruding elements in this case is equal to the number of ridges in the cross-section over the diameter d-d'.
  • the smooth or semi-solid first region comprises from 40-100 wt% of non-soap surfactants (based on the total weight of the smooth region), more preferred from 50-95 wt%, most preferred the first region is predominantly constituted by non-soap surfactants e.g. more than 55 wt% for example 56 to 90 wt%. It has been found that the combination of a separate smooth or semi-solid region and these high surfactant levels provide very good dispersing and cleaning properties to the tablet.
  • the surfactants in the smooth region comprise a combination of anionic surfactants and non-soap non-ionic surfactants in a weight ratio of from 5 : 1 to 1 : 5, more preferred 3 : 1 to 1 : 3, more preferred 2 : 1 to 1 : 2.
  • the smooth region comprises relatively high levels of non-ionic surfactants, preferably the non-soap surfactants are predominantly non-ionic surfactants, most preferred all the non-soap surfactants are non-ionic surfactants.
  • Further surfactants, for example cationic surfactants may equally be present for example at a level of 0.1 to 10 wt% based on the weight of the smooth or semi-solid part.
  • the smooth or semi-solid region may comprise soap for example at a level of 0.1 to 10 wt% based on the weight of the smooth or semi-solid part.
  • the soap is present in a level of at least 1 wt% of the smooth phase.
  • the level of C16 soaps is relatively high, particularly it is preferred that at least 50 wt% of the soap is a C16 soap, even more preferred from 60 to 100 wt% of the soap is a C16 soap.
  • the first smooth region of the tablet comprises at least 5 wt% of diluent materials having a dielectric constant from 5 to 16.
  • the molecular weight of the diluents is from 50 to 250, e.g. from 100 to 200.
  • Preferred examples of diluents are for example, Tri-ethyleneglycol di-methyl ether or Di-(Ethylene Glycol)Ethyl ether or mixtures thereof.
  • the level of the diluents is from 5 to 40 wt%, more preferred 2 to 30, most preferred 10-25 wt% based on the weight of the smooth region.
  • the diluents used in the smooth phase preferably have a flashpoint of at least 75°C, most preferred above 80°C or even above 90°C.
  • the smooth or semi-solid phase preferably comprises no or only low levels of water.
  • the level of water is less than 20 wt % based on the weight of the semi-solid phase, more preferred less than 15 wt%, most preferred from 5 to 12 wt%.
  • the smooth or semi-solid phases are substantially free from water, which means that apart from low levels of moisture (e.g. for neutralisation or as crystal water) no additional added water is present.
  • cleaning tablets in accordance to the invention also comprise a second region or phase which is a solid region preferably a region of compacted material.
  • the weight of the solid region may suitably range from 1 to 60 grams, more preferred from 10 to 50 grams, most suitably from 20 to 40 grams.
  • the second region comprises no or only low levels of surfactants.
  • the level of surfactants in the second region is less than 10 wt%(based on the total weight of the second region), more preferred from 0 to 9 wt%, most preferred from 1 to 8 wt%.
  • the second region of the tablet is preferably a solid region, for example this can be prepared by compression or melting.
  • the second region is a compacted particulate composition.
  • the second region preferably comprises ingredients of the tablet other than surfactants. Examples of these ingredients are builders, bleach system, enzymes etc.
  • the builders in the tablet are predominantly present in the second region.
  • the bleach system is predominantly present in the second region.
  • the enzymes are predominantly present in the second region.
  • the term "predominantly present” refers to a situation wherein at least 90 wt% of an ingredient is present in the second region, more preferred more than 98 wt%, most preferred substantially 100 wt%.
  • compositions which are used in tablets of the invention will contain one or more detergent surfactants.
  • these preferably provide from 5 to 50% by weight of the overall tablet composition, more preferably from 8 or 9% by weight of the overall composition up to 40% or 50% by weight.
  • Surfactant may be anionic (soap or non-soap), cationic, zwitterionic, amphoteric, nonionic or a combination of these.
  • Anionic surfactant may be present in an amount from 0.5 to 50% by weight, preferably from 2% or 4% up to 30% or 40% by weight of the tablet composition.
  • Synthetic (i.e. non-soap) anionic surfactants are well known to those skilled in the art.
  • alkylbenzene sulphonates particularly sodium linear alkylbenzene sulphonates having an alkyl chain length of C 8 -C 15 ; olefin sulphonates; alkane sulphonates; dialkyl sulphosuccinates; and fatty acid ester sulphonates.
  • Primary alkyl sulphate having the formula ROSO 3 - M + in which R is an alkyl or alkenyl chain of 8 to 18 carbon atoms especially 10 to 14 carbon atoms and M + is a solubilising cation, is commercially significant as an anionic surfactant.
  • Linear alkyl benzene sulphonate of the formula where R is linear alkyl of 8 to 15 carbon atoms and M + is a solubilising cation, especially sodium, is also a commercially significant anionic surfactant.
  • such linear alkyl benzene sulphonate or primary alkyl sulphate of the formula above, or a mixture thereof will be the desired anionic surfactant and may provide 75 to 100 wt% of any anionic non-soap surfactant in the composition.
  • the amount of non-soap anionic surfactant lies in a range from 5 to 20 wt% of the tablet composition.
  • Soaps for use in accordance to the invention are preferably sodium soaps derived from naturally occurring fatty acids, for example, the fatty acids from beef tallow.
  • Suitable nonionic surfactant compounds which may be used include in particular the reaction products of compounds having a hydrophobic group and a reactive hydrogen atom, for example, aliphatic alcohols, acids, amides or alkyl phenols with alkylene oxides, especially ethylene oxide.
  • Nonionic surfactant compounds are alkyl (C 8-22 ) phenol-ethylene oxide condensates, the condensation products of linear or branched aliphatic C 8-20 primary or secondary alcohols with ethylene oxide, and products made by condensation of ethylene oxide with the reaction products of propylene oxide and ethylene-diamine.
  • the primary and secondary alcohol ethoxylates especially the C 9-11 and C 12-15 primary and secondary alcohols ethoxylated with an average of from 5 to 20 moles of ethylene oxide per mole of alcohol.
  • the amount of nonionic surfactant lies in a range from 4 to 40%, better 4 or 5 to 30% by weight of the whole tablet.
  • nonionic surfactants are liquids. These may be absorbed onto particles of the composition.
  • the surfactant may be wholly nonionic, in an amount below 5 wt% of the whole tablet although it is known to include some anionic surfactant and to use up to 10 wt% surfactant in total.
  • a composition which is used in tablets of the invention will usually contain from 5 to 80%, more usually 15 to 60% by weight of detergency builder. This may be provided wholly by water soluble materials, or may be provided in large part or even entirely by water-insoluble material with water-softening properties. Water-insoluble detergency builder may be present as 5 to 80 wt%, better 5 to 60 wt% of the composition.
  • Alkali metal aluminosilicates are strongly favoured as environmentally acceptable water-insoluble builders for fabric washing.
  • Alkali metal (preferably sodium) aluminosilicates may be either crystalline or amorphous or mixtures thereof, having the general formula: 0.8 - 1.5 Na 2 O.Al 2 O 3 . 0.8 - 6 SiO 2 . xH 2 O
  • xH 2 O calcium ion exchange capacity
  • the preferred sodium aluminosilicates contain 1.5-3.5 SiO 2 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 described in the literature.
  • Suitable crystalline sodium aluminosilicate ion-exchange detergency builders are described, for example, in GB 1429143 (Procter & Gamble).
  • the preferred sodium aluminosilicates of this type are the well known commercially available zeolites A and X, the novel zeolite P described and claimed in EP 384070 (Unilever) and mixtures thereof.
  • a water-insoluble detergency builder could be a layered sodium silicate as described in US 4664839 .
  • NaSKS-6 is the trademark for a crystalline layered silicate marketed by Hoechst (commonly abbreviated as "SKS-6").
  • NaSKS-6 has the delta-Na 2 SiO 5 morphology form of layered silicate. It can be prepared by methods such as described in DE-A-3,417,649 and DE-A-3,742,043 .
  • Other such layered silicates such as those having the general formula NaMSi x O 2x+1 . yH 2 O wherein M is sodium or hydrogen, x is a number from 1.9 to 4, preferably 2, and y is a number from 0 to 20, preferably 0 can be used.
  • Water-soluble phosphorous-containing inorganic detergency builders include the alkali-metal orthophosphates, metaphosphates, pyrophosphates and polyphosphates.
  • Specific examples of inorganic phosphate builders include sodium and potassium tripolyphosphates, orthophosphates and hexametaphosphates.
  • Non-phosphorous water-soluble builders may be organic or inorganic.
  • Inorganic builders that may be present include alkali metal (generally sodium) carbonate; while organic builders include polycarboxylate polymers, such as polyacrylates, acrylic/maleic copolymers, and acrylic phosphonates, monomeric polycarboxylates such as citrates, gluconates, oxydisuccinates, glycerol mono- di- and trisuccinates, carboxymethyloxysuccinates, carboxymethyloxymalonates, dipicolinates and hydroxyethyliminodiacetates.
  • At least one region (preferably the second region) of a fabric washing tablet preferably include polycarboxylate polymers, more especially polyacrylates and acrylic/maleic copolymers which can function as builders and also inhibit unwanted deposition onto fabric from the wash liquor.
  • Tablets according to the invention may contain a bleach system in at least one region of a tablet, preferably in the second region.
  • This preferably comprises one or more peroxy bleach compounds, for example, inorganic persalts or organic peroxyacids, which may be employed in conjunction with activators to improve bleaching action at low wash temperatures. If any peroxygen compound is present, the amount is likely to lie in a range from 10 to 25% by weight of the composition.
  • Preferred inorganic persalts are sodium perborate monohydrate and tetrahydrate, and sodium percarbonate, advantageously employed together with an activator.
  • Bleach activators also referred to as bleach precursors
  • Preferred examples include peracetic acid precursors, for example, tetraacetylethylene diamine (TAED), now in widespread commercial use in conjunction with sodium perborate; and perbenzoic acid precursors.
  • TAED tetraacetylethylene diamine
  • perbenzoic acid precursors perbenzoic acid precursors.
  • the quaternary ammonium and phosphonium bleach activators disclosed in US 4751015 and US 4818426 are also of interest.
  • bleach activator which may be used, but which is not a bleach precursor, is a transition metal catalyst as disclosed in EP-A-458397 , EP-A-458398 and EP-A-549272 .
  • a bleach system may also include a bleach stabiliser (heavy metal sequestrant) such as ethylenediamine tetramethylene phosphonate and diethylenetriamine pentamethylene phosphonate.
  • a bleach is present and is a water-soluble inorganic peroxygen bleach, the amount may well be from 10% to 25% by weight of the composition.
  • the detergent tablets of the invention may also contain (preferably in the second region) one of the detergency enzymes well known in the art for their ability to degrade and aid in the removal of various soils and stains.
  • Suitable enzymes include the various proteases, cellulases, lipases, amylases, and mixtures thereof, which are designed to remove a variety of soils and stains from fabrics. Examples of suitable proteases are Maxatase (Trade Mark), as supplied by DSM N.V., Delft, Netherlands, and Alcalase (Trade Mark), and Savinase (Trade Mark), as supplied by Novozymes A/S, Copenhagen, Denmark.
  • Detergency enzymes are commonly employed in the form of granules or marumes, optionally with a protective coating, in amount of from about 0.1% to about 3.0% by weight of the composition; and these granules or marumes present no problems with respect to compaction to form a tablet.
  • the detergent tablets of the invention may also contain (preferably in the second region) a fluorescer (optical brightener), for example, Tinopal (Trade Mark) DMS or Tinopal CBS available from Ciba Speciality Chemicals AG, Basel, Switzerland.
  • a fluorescer optical brightener
  • Tinopal DMS is disodium 4,4'bis-(2-morpholino-4-anilino-s-triazin-6-ylamino) stilbene disulphonate
  • Tinopal CBS is disodium 2,2'-bis-(phenylstyryl) disulphonate.
  • An antifoam material is advantageously included (preferably in the second region), especially if a detergent tablet is primarily intended for use in front-loading drum-type automatic washing machines.
  • Suitable antifoam materials are usually in granular form, such as those described in EP 266863A (Unilever).
  • Such antifoam granules typically comprise a mixture of silicone oil, petroleum jelly, hydrophobic silica and alkyl phosphate as antifoam active material, absorbed onto a porous absorbed water-soluble carbonate-based inorganic carrier material.
  • Antifoam granules may be present in an amount up to 5% by weight of the composition.
  • a detergent tablet of the invention includes an amount of an alkali metal silicate, particularly sodium ortho-, meta- or disilicate.
  • an alkali metal silicate particularly sodium ortho-, meta- or disilicate.
  • the presence of such alkali metal silicates at levels, for example, of 0.1 to 10 wt%, may be advantageous in providing protection against the corrosion of metal parts in washing machines, besides providing some measure of building and giving processing benefits in manufacture of the particulate material which is compacted into tablets.
  • a tablet for fabric washing will generally not contain more than 15 wt% silicate.
  • a tablet for machine dishwashing will often contain more than 20 wt% silicate.
  • the silicate is present in the second region of the tablet.
  • compositions which can optionally be employed in a region of a fabric washing detergent of the invention tablet include antiredeposition agents such as sodium carboxymethylcellulose, straight-chain polyvinyl pyrrolidone and the cellulose ethers such as methyl cellulose and ethyl hydroxyethyl cellulose, fabric-softening agents; heavy metal sequestrants such as EDTA; perfumes; and colorants or coloured speckles.
  • antiredeposition agents such as sodium carboxymethylcellulose, straight-chain polyvinyl pyrrolidone and the cellulose ethers such as methyl cellulose and ethyl hydroxyethyl cellulose, fabric-softening agents
  • heavy metal sequestrants such as EDTA
  • perfumes and colorants or coloured speckles.
  • dispersing aids are water-swellable polymers (e.g. SCMC) highly soluble materials (e.g. sodium citrate, potassium carbonate or sodium acetate) or sodium tripolyphospate with preferably at least 40% of the anhydrous phase I form.
  • SCMC water-swellable polymers
  • highly soluble materials e.g. sodium citrate, potassium carbonate or sodium acetate
  • sodium tripolyphospate preferably at least 40% of the anhydrous phase I form.
  • each of the regions may be composed of a limited number of discrete regions such as for example illustrated in figure 5.
  • Cleaning tablets of the invention may be manufactured by any suitable method e.g. the pre-preparation of the smooth phase e.g. by extrusion or melt-casting followed by assembly of the smooth phase and the other phases of the tablet.
  • the second phase of compressed particulate material may be pre-prepared followed by in-situ preparation of the smooth phase e.g. by casting, coating or spraying, or assembly of said compressed phase with a separately prepared smooth phase.
  • Typical processing conditions for preparing the smooth phase or the compressed phase are for example disclosed in the documents as described above.
  • a preferred process for the preparation of a cleaning tablet of the invention is described in EP 1,371,721 and involves the separate preparation of a smooth phase, preferably by a casting process. Also separately a solid layer is formed preferably by a compression step, followed by assembly of the smooth phase and the solid layer.
  • the process of the invention involves the preparation of the smooth phase by casting wherein a mould is used which is at least partially made of a flexible material for example as described in our non-prepublished patent application EP04076395.5 .
  • the bottom part of the mould is made of flexible material.
  • the shape of this mould preferably corresponds to the desired profile of rounded ridges for the smooth phase.
  • the material forming the smooth phase can be introduced into the at least partially flexible mould thus forming a smooth phase having a ridged side adjacent to the mould and a substantially flat upper side.
  • the smooth phase is then optionally rested to set, followed by optionally turning the mould up side down and flexing the flexible bottom part of the mould, thereby releasing the smooth part from the mould.
  • the smooth part can be assembled with the compressed phase e.g. by using a glue or barrier layer between the smooth phase and the solid phase, whereby the substantially flat side is adhered to the solid phase thus exposing the protruding elements the smooth phase.
  • Tablets of the invention may be used e.g. for mechanical diswashing or laundry washing.
  • a dispenser e.g. a shuttle or a net may be used.
  • the flat (non-ridged) bottom surface of smooth part Q was provided with 0.5 gram of an adhesive material (sulphonated polyester; Bostik Findley HX 9393).
  • composition R without adhesive
  • composition S with 0.5 g adhesive
  • These smooth parts had two substantially flat sides, a weight of approximately 5 g smooth material(plus 0.5 gram adhesive for composition S), a diameter of about 32 mm and a height of about 5mm.
  • the dissolution properties of the parts were determined by adding a single smooth part to 500 ml of water at 20 C, followed by stirring for 5 minutes at 100 rpm. Any remaining adhesive material was removed and the residual weight of the non-dissolved smooth part was determined and the percentage of dissolved matter based on the original weight of the 5 Grams smooth formulation (excluding the adhesive material) was calculated.
  • a detergent powder was made of the following composition by pre granulating the granule ingredients, followed by post-dosing the rest of the ingredients Ingredient Parts by weight granules Na-LAS 1.1 Nonionic 7EO 0.5 Soap (C16-C18) 0.1 Zeolite A24 2.4 NaAc3aq 0.3 Light soda ash 0.4 SCMC (68%) 0.1 Moisture/minors 0.4 Post-dose EAG (17% silicone) 3.0 Fluorescer (15%) 2.2 STP HPA 28.3 STP LV 34.0 Na-disilicate (80%) 3.8 TAED (83%) 4.3 Percarbonate 16.9 Dequest 2047 1.9 Minors/ enzymes/colour to 100
  • Multi-layer tablets are made by pre-compressing 25 grams of the powdered composition in a die of 35 mm diameter at 4 kN/cm 2, way followed by applying 0.5 grams of adhesive (sulphonated polyester) on top of the compressed phase followed by adherence of a smooth and semi-solid part according to P of example 1 on top of the compressed layer.
  • adhesive sulphonated polyester
  • Example 2 was repeated by replacing the detergent powder by a powder of the following composition whereby the ingredients marked with an * were pre granulated followed by post-dosing the remaining ingredients.
  • Tablet Parts by weight Zeolite A24 * 21 Na-LAS * 9.3 Soap (C16018)* 0.7 Nonionic 7EO * 4.1 Sodium acetate trihydrate* 2.7 Sodium percarbonate (coated) 18 TAED 8.1 Sodium disilicate 5.1 Sodium acetate 3aq 27.0 moisture 4.0
  • Example 2 was repeated by using instead of the smooth part P of example 1 a smooth part with a composition as in example 1, but with a shape in accordance to one of figures 4A, 4B, 5 or 6.

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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)
  • Detergent Compositions (AREA)
EP06075874A 2006-04-12 2006-04-12 Tablettes détergentes Withdrawn EP1845153A1 (fr)

Priority Applications (1)

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EP06075874A EP1845153A1 (fr) 2006-04-12 2006-04-12 Tablettes détergentes

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EP06075874A EP1845153A1 (fr) 2006-04-12 2006-04-12 Tablettes détergentes

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2097253B1 (fr) * 2006-10-27 2013-01-23 Henkel AG & Co. KGaA Corps moulés de lessive ou de détergent
WO2017013162A1 (fr) * 2015-07-23 2017-01-26 Henkel Ag & Co. Kgaa Utilisation d'une combinaison d'un agent complexant et d'un tensioactif pour améliorer l'efficacité de rinçage
WO2017013161A1 (fr) * 2015-07-23 2017-01-26 Henkel Ag & Co. Kgaa Produit pour lave-vaisselle multiphase à noyau tensioactif
EP3878935A1 (fr) * 2020-03-09 2021-09-15 Peter Obereisenbuchner Unité de dosage destiné au nettoyage mécanique des objets
EP4019619A1 (fr) * 2020-12-22 2022-06-29 Henkel AG & Co. KGaA Corps de moule de détergent pour vaisselle à la main à bossages

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4996000A (en) * 1989-02-03 1991-02-26 Redeker Dale R Multilayer cleansing bar
US5198140A (en) * 1988-11-02 1993-03-30 Colgate-Palmolive Company Dual composition soap or detergent bar containing convoluted surfaces and tongue and groove interlock
DE19908057A1 (de) * 1999-02-25 2000-08-31 Henkel Kgaa Formschlüssig aneinanderreihbare Wasch- und Reinigungsmittelformkörper
DE19930771A1 (de) * 1999-07-03 2001-01-04 Henkel Kgaa Verfahren zur Herstellung von Wasch- und Reinigungsmittelformkörpern
EP1382668A1 (fr) * 2002-06-11 2004-01-21 Unilever N.V. Tablettes détergentes
DE10313172A1 (de) * 2003-03-25 2004-10-14 Henkel Kgaa Gestaltsoptimierte Wasch- oder Reinigungsmitteltabletten
EP1491622A1 (fr) * 2003-06-24 2004-12-29 Unilever N.V. Compositions détergentes

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5198140A (en) * 1988-11-02 1993-03-30 Colgate-Palmolive Company Dual composition soap or detergent bar containing convoluted surfaces and tongue and groove interlock
US4996000A (en) * 1989-02-03 1991-02-26 Redeker Dale R Multilayer cleansing bar
DE19908057A1 (de) * 1999-02-25 2000-08-31 Henkel Kgaa Formschlüssig aneinanderreihbare Wasch- und Reinigungsmittelformkörper
DE19930771A1 (de) * 1999-07-03 2001-01-04 Henkel Kgaa Verfahren zur Herstellung von Wasch- und Reinigungsmittelformkörpern
EP1382668A1 (fr) * 2002-06-11 2004-01-21 Unilever N.V. Tablettes détergentes
DE10313172A1 (de) * 2003-03-25 2004-10-14 Henkel Kgaa Gestaltsoptimierte Wasch- oder Reinigungsmitteltabletten
EP1491622A1 (fr) * 2003-06-24 2004-12-29 Unilever N.V. Compositions détergentes

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2097253B1 (fr) * 2006-10-27 2013-01-23 Henkel AG & Co. KGaA Corps moulés de lessive ou de détergent
WO2017013162A1 (fr) * 2015-07-23 2017-01-26 Henkel Ag & Co. Kgaa Utilisation d'une combinaison d'un agent complexant et d'un tensioactif pour améliorer l'efficacité de rinçage
WO2017013161A1 (fr) * 2015-07-23 2017-01-26 Henkel Ag & Co. Kgaa Produit pour lave-vaisselle multiphase à noyau tensioactif
EP3878935A1 (fr) * 2020-03-09 2021-09-15 Peter Obereisenbuchner Unité de dosage destiné au nettoyage mécanique des objets
EP4019619A1 (fr) * 2020-12-22 2022-06-29 Henkel AG & Co. KGaA Corps de moule de détergent pour vaisselle à la main à bossages

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