EP1866404B1 - Pastilles de traitement du linge a phases multiples - Google Patents

Pastilles de traitement du linge a phases multiples Download PDF

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Publication number
EP1866404B1
EP1866404B1 EP06723531.7A EP06723531A EP1866404B1 EP 1866404 B1 EP1866404 B1 EP 1866404B1 EP 06723531 A EP06723531 A EP 06723531A EP 1866404 B1 EP1866404 B1 EP 1866404B1
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EP
European Patent Office
Prior art keywords
phase
tablet
tablets
adhesive
laundry treatment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
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EP06723531.7A
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German (de)
English (en)
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EP1866404A1 (fr
Inventor
B. J. Ten Brummelhuis
P. E. M. Overdevest
Peter Iwan Stuut
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unilever PLC
Unilever NV
Original Assignee
Unilever PLC
Unilever NV
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Priority claimed from GB0507179A external-priority patent/GB0507179D0/en
Priority claimed from GB0514824A external-priority patent/GB0514824D0/en
Application filed by Unilever PLC, Unilever NV filed Critical Unilever PLC
Publication of EP1866404A1 publication Critical patent/EP1866404A1/fr
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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
    • C11D17/0086—Laundry tablets
    • 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
    • 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
    • C11D17/04—Detergent materials or soaps characterised by their shape or physical properties combined with or containing other objects

Definitions

  • the invention relates to multi-phase laundry treatment tablets containing both a smooth (or gel) phase and a solid phase, and packaging therefor.
  • 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 in the washload.
  • Tablets of a treatment 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.
  • CA 2,296,271 discloses a package for detergent tablets.
  • one or more laundry treatment tablets in combination with a package wherein the one or more laundry treatment tablets are packaged individually or in groups corresponding with a unit dose
  • Tablets having a diametrical fracture stress of 10-40kPa have improved dissolution properties.
  • the diametrical fracture stress of the tablet is linked to the compression stress used to form the tablet. By selecting a lower diametrical stress, a lower compression stress is required, making the tablet less dense and therefore exhibiting better dispersion and dissolution properties.
  • the diametrical fracture stress may be 10-20kPa. Such tablets exhibit even better dissolution properties.
  • an inner surface bearing adhesive means that any loose particulate matter such as crumbs or dust which have eroded or broken away from the solid phase of the tablet/s can adhere to the adhesive.
  • the laundry treatment tablets themselves, are more attached to the inner surface bearing the adhesive.
  • the packages comprises more than one laundry treatment tablet, the tablets are less likely to move against each other within the package and so friction between the tablets is reduced. Therefore, the likelihood of tablet fracture and the amount of crumbs/dust created are reduced.
  • particulate matter from the first phase becomes attached to the smooth phase this can detract from the appearance of the smooth phase, by dulling any shininess and/or translucence or transparency. It can also reduce the visual contrast between the two phases, thereby reducing the visual cue to the consumer that there are two distinct layers, each having a different composition function.
  • Adhesion of crumbs and dust to the adhesive layer prevents or at least reduces the amount of crumbs/dust which can adhere to the smooth phase.
  • the package maybe rigid or flexible.
  • the package may comprise one or more seals which may be sealed using adhesive.
  • the adhesive employed may comprise natural rubber latex and/or synthetic polymer dispersions.
  • the sealing adhesive may be used e.g. expanded to provide at least one region of the invention.
  • the package is a film package such as a flow pack or flow wrap pack, comprising a tubular film bag with one longitudinal seam and two transverse seams.
  • the film has an moisture vapour transfer rate of 1-20 g/m 2 /day and more preferably 1-10 g/m 2 /day in order to protect the tablets which are hydroscopic individual or groups of tablets are packaged corresponding with a unit dose.
  • tablets are packaged in pairs, and more preferably side by side.
  • the adhesive may be located on a region or regions of the inner surface of the packaging which is adjacent the solid phase. This enables the adhesive to pick up the dust/debris from the solid phase before it reaches the smooth phase.
  • the adhesive may be applied to the inner surface of the packaging material before it is formed into the package e.g. flow-wrap.
  • the packaging material may also comprise a release lacquer on its outer surface to enable storage of the packaging material prior to the formation of the package.
  • the release lacquer may comprise a solvent based polyamide and will prevent layers of the packaging material sticking during storage of the film wound on a real.
  • the adhesive may be applied during the forming of the package.
  • the adhesive may be used to form the longitudinal seal of a flow wrap package.
  • the adhesive may be applied longitudinally (corresponding to the longitudinal seal) and/or at successive points transversely (corresponding to the end seals) of the flow wrap packaging material, whereby the region/s is/are located and/or dimensioned relative to the final configuration such that region or regions of adhesive remain exposed internally of the package, after the forming process. These exposed regions provide the at least one region bearing adhesive of the invention.
  • the laundry treatment tablet of the invention cleans, softens and/or freshens the laundry fabrics being treated in the washing machine.
  • the laundry cleaning tablet of the invention is a laundry cleaning tablet capable of cleaning the laundry fabrics.
  • the regions of the tablet are preferably separate layers within a cleaning tablet.
  • a discrete region of a tablet could also have other forms for example one or more core(s) or insert(s).
  • a "phase" is a discrete region at the tablet having a particular composition and/or physical nature such as morphology, texture or appearance.
  • the tablets utilised in the present invention may be any suitable shape, e.g. spherical or polyhedral (which maybe square or rectangular in cross section. However, preferably they are of cylindrical shape wherein the two main surfaces (upper side and bottom side) are substantially flat. In one embodiment, the outer surface of the smooth phase is dome-shaped to facilitate pre-treatment application.
  • the multi-phase tablets used in the present invention comprise at least one smooth phase and at least one solid phase. It may also comprise at least one intermediate phase if the smooth phase comprises a relatively high level of liquid component so as to improve the stability of the tablet during storage.
  • 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 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 smooth phase is transparent or translucent.
  • the smooth phase of the tablet is a semi-solid phase.
  • 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 a semi-solid is, for example, described in EP 1,375,636 .
  • the other phases of the laundry treatment tablet are possibly separate layers within the tablet, preferably substantially flat layers.
  • the smooth phase covers a substantial part of the upper surface of the other phase, 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 phase is covered by the first smooth phase.
  • the term upper surface refers to one of the main sides of the laundry treatment tablet which by placing the tablet on a flat surface could be classified as the upper surface.
  • the other phase of the tablet suitably is a layer of compacted particulate material, preferably having a substantially flat upper surface.
  • the first smooth phase 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 phase is from 1 to 40 grammes, more preferred from 3 to 30 grammes, most preferred from 4 to 10 grammes, preferably the level of non-soap surfactants in the smooth phase is from 0.5 to 10 grams, more preferred from 1 to 7 grams.
  • the smooth or semi-solid first phase comprises from 40-100 wt% of non-soap surfactants (based on the total weight of the smooth phase), more preferred from 50-95 wt%, most preferred the first phase is predominantly constituted by non-soap surfactants e.g. more than 60 wt% for example 70 to 90 wt%. It has been found that the combination of a separate smooth or semi-solid phase and these high surfactant levels provide very good dispersing and cleaning properties to the tablet.
  • the smooth or semi-solid phase 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 phase of the tablet comprises at least 5 wt% of diluent materials having a dielectric constant of 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 phase.
  • 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.
  • the outer surface of the smooth phase may comprise from 5 to 25 rounded ridges so as to improve the dissolution rate of the smooth phase of the tablet and reduce contact between the user and the smooth phase.
  • the rounded ridges are of such a size to prevent projection of ridge peaks through the apertures of the dispensing device.
  • the smooth phase may be prepared by heating the ingredients together until they melt to form a substantially homogeneous liquid, followed by cooling to solidification and if necessary, cutting or otherwise forming to the desired shape and size.
  • the lower diametrical fracture stress of the second solid phase means that the level of dispersion aids can be set more freely, leaving room within the tablet formulation for increased levels of other active agents.
  • the diametrical fracture stress is 10-30kPa.
  • the amount of disintegrating agents such as water swellable polymers can be reduced.
  • the amount of such polymers, such as sodium carboxymethyl cellulose SCMC, is preferably less than 0.5% and even more preferably less than 0.1% and more preferably 0%.
  • the level of disintegrants may be less than 5%, preferably less than 0.5%, more preferably less than 0.1% and even more preferably 0%.
  • a tablet having less than 45% by weight of phosphate or poly-phosphate compounds, more preferably less than 30% even more preferably less than 15 and most preferably 0% of phosphate or poly-phosphate compounds. Reducing the level of phosphate or poly-phosphate makes the tablet more environmentally acceptable.
  • Dispersants may be provided in the form of disintegrating-promoting particles. Such particles typically contain at least 40% (of their own weight) of one or more:
  • the total quantity of disintegration-promoting particles may be less than 5%wt and preferably less than 1% and more preferably 0% of the tablet.
  • the weight of the solid phase may suitably range from 1 to 60 grams, more preferred from 10 to 50 grams, most suitably from 20 to 40 grams.
  • the second phase may comprise no or only low levels of surfactants.
  • the level of surfactants in the second phase is less than 10 wt%(based on the total weight of the second phase), more preferred from 0 to 9 wt%, most preferred from 1 to 8 wt%.
  • the second phase preferably comprises ingredients of the tablet other than surfactants.
  • these ingredients are builders, bleach system, enzymes etc.
  • the builders in the tablet are predominantly present in the second phase.
  • the bleach system is predominantly present in the second phase.
  • the enzymes are predominantly present in the second phase.
  • the term "predominantly present” refers to a situation wherein at least 90 wt% of an ingredient is present in the second phase, more preferred more than 98 wt%, most preferred substantially 100 wt%. Materials which may be used in tablets of this invention will now be discussed in more detail.
  • 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.
  • 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
  • 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 ASKS-6").
  • ASKS-6 Hoechst
  • 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 .
  • 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.
  • alkali metal generally sodium
  • 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, dip
  • At least one phase (preferably the second phase) of a laundry treatment tablet preferably include polycarboxylate polymers, more especially polyacrylates and acrylic/maleic copolymers which can function as builders and also inhibit unwanted deposition onto laundry fabric from the wash liquor.
  • Tablets according to the invention may contain a bleach system in at least one phase of a tablet, preferably in the second phase.
  • 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 laundry treatment tablets of the invention may also contain (preferably in the second phase) 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.
  • suitable proteases are Maxatase (Trade Mark), as supplied by Gist-Brocades N.V., Delft, Holland, and Alcalase (Trade Mark), and Savinase (Trade Mark), as supplied by Novo Industri 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 laundry treatment tablets of the invention may also contain (preferably in the second phase) a fluorescer (optical brightener), for example, Tinopal (Trade Mark) DMS or Tinopal CBS available from Ciba-Geigy AG, Basel, Switzerland.
  • Tinopal DMS is disodium 4,4'bis-(2-morpholino-4-anilino-s-triazin-6-ylamino) stilbene disulphonate
  • Tinopal CBS is disodium 2,2'-bis-(phenyl-styryl) disulphonate.
  • An antifoam material is advantageously included (preferably in the second phase), especially if a laundry treatment 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 laundry treatment 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.
  • the silicate is present in the second phase of the tablet.
  • compositions which can optionally be employed in a phase of a laundry treatment tablet of the invention include anti-redeposition 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.
  • anti-redeposition 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.
  • the second phase of laundry treatment tablet of this invention is a preferably a matrix of compacted particles.
  • the particulate composition has an average particle size in the range from 200 to 2000 ⁇ m, more preferably from 250 to 1400 ⁇ m. Fine particles, smaller than 180 ⁇ m or 200 ⁇ m may be eliminated by sieving before tableting, if desired, although we have observed that this is not always essential.
  • the starting particulate composition may in principle have any bulk density
  • the present invention is especially relevant to tablets made by compacting powders of relatively high bulk density, because of their greater tendency to exhibit disintegration and dispersion problems.
  • Such tablets have the advantage that, as compared with a tablet derived from a low bulk density powder, a given dose of composition can be presented as a smaller tablet.
  • the starting particulate composition may suitably have a bulk density of at least 400 g/litre, preferably at least 500 g/litre, and perhaps at least 600 g/litre.
  • Tableting machinery able to carry out the manufacture of tablets of the invention is known, for example suitable tablet presses are available from Fette and from Korch.
  • Tableting may be carried out at ambient temperature or at a temperature above ambient which may allow adequate strength to be achieved with less applied pressure during compaction.
  • the particulate composition is preferably supplied to the tableting machinery at an elevated temperature. This will of course supply heat to the tableting machinery, but the machinery may be heated in some other way also.
  • the size of a tablet will suitably range from 10 to 160 grams, preferably from 15 to 60 g, depending on the conditions of intended use, and whether it represents a dose for an average load in a fabric washing or dishwashing machine or a fractional part of such a dose.
  • the tablets may be of any shape. However, for ease of packaging they are preferably blocks of substantially uniform cross-section, such as cylinders or cuboids.
  • the overall density of a tablet preferably lies in a range from 1040 or 1050gm/litre up to 1600gm/litre.
  • the above description of the tablet has been given with reference to a tablet constituted by one or two phases. It will however be understood that each of the phase may be composed of a limited number of discrete regions.
  • Laundry treatment 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.
  • the flow wrap package 1 containing a pair of laundry tablets 3.
  • the flow wrap package 1 comprises a tubular plastic film bag having a longitudinal seal 5 and transverse end seals 7.
  • the longitudinal seal 5 is bounded on both sides by longitudinal strips of adhesive 9 (not shown in fig 2 ).
  • the tablets 3 comprise two discrete phases:
  • the solid phase 11 comprises compacked particulate material.
  • the smooth phase is a translucent gel.
  • the tablets 3 are oriented within the package 1 so that they are adjacent the longitudinal seal and adhesive strips 9. In this way the strips collect any debris and/or dust which erodes/breaks away from the solid phase (during packaging and transit) and prevents it from adhering to the smooth phase 13.
  • the adhesive is used in the formation of the flow-wrap. In this way an extra adhesive apply step is not necessary in the flow-wrap manufacturing process.
  • This process essentially comprises the formation of a film tube from a strip of plastic film which is wrapped and sealed longitudinally. The tube is then sequentially filled (with tablets) transversely sealed and cut to provide individual packages.
  • the longitudinal seal is formed using a pressure sensitive adhesive applied in a wide band longitudinally of the film strip.
  • the adhesive band 9 is wide enough such that alter the longitudinal (fin) seal 5 is formed the seal 5 is bordered on each side by adhesive 9.
  • the transverse seals on also formed by adhesive.
  • package seals could be formed by heat sealing and the adhesive applied prior to the sealing process.
  • heat/adhesive sealing e.g. longitudinal adhesive sealing and transverse heat sealing.
  • An exemplary laundry treatment tablet formulation is as follows:
  • a detergent powder was made of the following composition: A detergent base powder, incorporating organic surfactants, a small percentage of crystalline sodium acetate trihydrate, and zeolite MAP was made using known granulation technology. It had the following composition, shown as parts by weight. Ingredient Parts by Weight Sodium linear alkylbenzene sulphonate 20.85 nonionic surfactant (C13-15 branched fatty alcohol 3EO) 3.07 nonionic surfactant C13-15 branched fatty alcohol 7EO) 5.98 Soap 1.62 zeolite A24 46.70 Sodium acetate trihydrate 5.92 Sodium carbonate 6.60 sodium carboxymethyl cellulose (SCMC) 0.64 additional moisture and minor ingredients 8.50 Total 100
  • zeolite MAP zeolite A24
  • the amount of zeolite MAP (zeolite A24) in the table above is the amount which would be present if it was anhydrous. Its accompanying small content of moisture is included as part of the moisture and minor ingredients.
  • the base powder and other ingredients were mixed together as set out in the following table. Comp A.
  • Antifoam is 17%wt silicon oil, 71%wt sodium carbonate and the remainder petroleum jelly and phosphate ester.
  • Fluorescer is 9.9%wt Fluorescer and 82.5%wt sodium carbonate the remainder being minor ingredients
  • TAED is 83%wt TAED in 9%wt sodium sulphate the remainder being minor ingredients.
  • Soil release polymer is 18%wt soil-release polymer, 44%wt zeolite MAP, 21%wt sodium carbonate and minor ingredients.
  • Acrylic/maleic polymer is Sokolan CP5 ex BASE (91%wt active)
  • Cellulosic swelling disintegrant (Arbocel ex Rettenmaier)
  • the solid phase was made by mixing the ingredients (except for the cellulosic swelling disintegrant) and finally adding the cellulosic swelling disintegrant.
  • the solid phase was made in a labscale Graseby Specac tabletting press; and had a strength (expressed in terms of the diametrical fracture stress) of approximately 25k Pa.
  • D the tablet diameter and t its thickness.
  • a second exemplary solid phase formulation is exactly as for the above formulation an except that the level of the cellulosic swelling disintegrant is to 1.75% wt (and the base powder increased to 58.93% wt of the final formulation.
  • the mixture semi solid part composition was heated to 80°C and cast into moulds and cooled to 20°C to form firm, 5 grammes smooth and semi-solid parts of 32mm diameter and 6mm high.
  • Multi-layer tablets are made by pre-compressing 25 grammes of the powdered composition in a die of 45 mm diameter at 4 kN/cm 2 , followed by adherence of a smooth and semi-solid part on top of the compressed layer followed by a final compression step at 0.1 kN/cm 2 .
  • the smooth and semi-solid part flows by the compaction forces to form a 3.4 mm smooth semi-solid layer adhered on top of the compressed particulate layer.
  • the diametrical fracture stress of the second solid phase is still less than 30kPa.
  • Each flow wrap contained two laundry treatment tablets having a composition according to the exemplary formulation described above. The tablets were placed side by side within the package.
  • A, B and C contained tablets orientated such that the solid phase of the tablets were adjacent to the longitudinal seal and strips of adhesive.
  • A', B' and C' contained tablets orientated such that the smooth phase of the tablets were adjacent to the longitudinal seal and strips of adhesive.
  • the test comprised the steps of:
  • the tablet shake test demonstrates that cold-sealed flow wraps with adhesive, examples B, C, B' and C', are more effective in reducing the amount of visible fines deposited on the smooth phase of the laundry treatment tablet compared with heat-sealed flow wraps, comparative examples A and A'.
  • the package containing the laundry treatment tablets corresponding to a unit dose (not shown) is torn open and the tablets dropped into the washing machine.
  • a dispensing device such as a net bag may be used.

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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)

Claims (6)

  1. Pastille(s) de traitement du linge en combinaison avec un conditionnement, dans laquelle/lesquelles la ou les pastille(s) de traitement du linge est(sont) conditionnée(s) individuellement ou par groupes correspondant à une dose unitaire,
    i) la ou les pastille (s) de traitement du linge ayant une pluralité de phases discrètes avec des compositions qui diffèrent, dans laquelle/lesquelles au moins une première phase de la(des) pastille(s) est une phase lisse ayant une surface externe et au moins une deuxième phase de la(des) pastille(s) est une phase solide comprenant un matériau particulaire compacté et ayant une contrainte de rupture diamétrale [DFS] de 10 à 40 kPa, dans laquelle/lesquelles la contrainte de rupture diamétrale est définie par DFS = 2*Fmax/(Π*D*t), Fmax étant la résistance de la pastille exprimée comme la force nécessaire pour rompre une pastille lorsqu'elle est appliquée sur sa circonférence ; D étant le diamètre de la pastille et t son épaisseur ; et
    ii) le conditionnement comprenant une surface interne, dont au moins une région comporte un adhésif.
  2. Combinaison selon la revendication 1, dans laquelle la pastille de traitement du linge nettoie, adoucit et rafraîchit les tissus du linge.
  3. Combinaison selon les revendications 1 ou 2, dans laquelle la deuxième phase de la pastille de traitement du linge est une couche de matériau particulaire compacté.
  4. Combinaison selon l'une quelconque des revendications précédentes, dans laquelle la(les) région(s) de l'adhésif est/sont adjacentes à la phase solide.
  5. Combinaison selon l'une quelconque des revendications précédentes, dans laquelle le conditionnement comprend un joint longitudinal collé sur au moins un côté par la région ou chaque région d'adhésif.
  6. Combinaison selon l'une quelconque des revendications précédentes, dans laquelle le conditionnement comprend des joints d'extrémité transversaux, dont au moins un est collé sur au moins un côté par la région ou chaque région d'adhésif.
EP06723531.7A 2005-04-08 2006-03-14 Pastilles de traitement du linge a phases multiples Not-in-force EP1866404B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB0507179A GB0507179D0 (en) 2005-04-08 2005-04-08 Multi-phase laundry treatment tablets
GB0514824A GB0514824D0 (en) 2005-07-20 2005-07-20 Multi-phase laundry treatment tablets
PCT/EP2006/002501 WO2006108490A1 (fr) 2005-04-08 2006-03-14 Pastilles de traitement du linge a phases multiples

Publications (2)

Publication Number Publication Date
EP1866404A1 EP1866404A1 (fr) 2007-12-19
EP1866404B1 true EP1866404B1 (fr) 2013-11-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP06723531.7A Not-in-force EP1866404B1 (fr) 2005-04-08 2006-03-14 Pastilles de traitement du linge a phases multiples

Country Status (3)

Country Link
EP (1) EP1866404B1 (fr)
ES (1) ES2448841T3 (fr)
WO (1) WO2006108490A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9752105B2 (en) 2012-09-13 2017-09-05 Ecolab Usa Inc. Two step method of cleaning, sanitizing, and rinsing a surface
US9994799B2 (en) 2012-09-13 2018-06-12 Ecolab Usa Inc. Hard surface cleaning compositions comprising phosphinosuccinic acid adducts and methods of use
US20140308162A1 (en) 2013-04-15 2014-10-16 Ecolab Usa Inc. Peroxycarboxylic acid based sanitizing rinse additives for use in ware washing
US8871699B2 (en) 2012-09-13 2014-10-28 Ecolab Usa Inc. Detergent composition comprising phosphinosuccinic acid adducts and methods of use

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19902065A1 (de) * 1999-01-20 2000-08-03 Henkel Kgaa Verpackung für tablettenförmige Gegenstände und Verfahren zur Herstellung einer solchen Verpackung
EP1043390A1 (fr) * 1999-04-09 2000-10-11 The Procter & Gamble Company Détergent sous forme de tablette
PL1601753T3 (pl) * 2003-03-11 2007-12-31 Reckitt Benckiser Nv Pakiet zawierający kompozycję detergentu
EP1516916A1 (fr) * 2003-09-19 2005-03-23 Unilever N.V. Composition détergente

Also Published As

Publication number Publication date
EP1866404A1 (fr) 2007-12-19
WO2006108490A1 (fr) 2006-10-19
ES2448841T3 (es) 2014-03-17

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