EP1019486A1 - Composition pour utilisation dans un lave-linge - Google Patents

Composition pour utilisation dans un lave-linge

Info

Publication number
EP1019486A1
EP1019486A1 EP99939398A EP99939398A EP1019486A1 EP 1019486 A1 EP1019486 A1 EP 1019486A1 EP 99939398 A EP99939398 A EP 99939398A EP 99939398 A EP99939398 A EP 99939398A EP 1019486 A1 EP1019486 A1 EP 1019486A1
Authority
EP
European Patent Office
Prior art keywords
composition according
composition
cavity
particle
tablet
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.)
Ceased
Application number
EP99939398A
Other languages
German (de)
English (en)
Inventor
Guido Wäschenbach
Ralf Wiedemann
Enric Carbonell
Antonio Cordellina
Manuela Bosco
Giorgio Franzolin
Joan Clotet
Dora Zamuner
Paul W. Robinson
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.)
Reckitt Benckiser NV
Original Assignee
Benckiser NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Benckiser NV filed Critical Benckiser NV
Publication of EP1019486A1 publication Critical patent/EP1019486A1/fr
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • 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
    • C11D17/0091—Dishwashing tablets

Definitions

  • the present invention relates to a composition for use in a washing machine and a method for using it.
  • washing programs essentially consist of the following basic steps: pre-wash cycle; Main wash cycle; several rinses; and spin cycle. While the actual detergent, which is supposed to have a cleaning effect, is added at the beginning of the main wash cycle (or possibly at the start of the pre-wash cycle), special detergents with different functions can be used in the rinse cycles. These special rinse aid agents should primarily bring additional laundry treatment benefits.
  • a non-exhaustive list of such agents includes, but is not limited to: fragrances (pleasant smell of laundry), fabric softener (softness of laundry), antistatic agents (reducing or preventing the build-up of static electricity in laundry), agents to restore the ability of the laundry Laundry to absorb moisture, mild acids (breakdown of incrustations or neutralization of alkalinity), bleaching agents, either on an oxygen or chlorine basis (improving the cleaning effect), disinfectants, agents for the long-term protection of both the laundry and the person wearing the laundry against insects or mites , Agents for improved removal of grease soiling, agents for providing anti-crease, optical brighteners, ironing aids (to facilitate ironing of the laundry), agents for inhibiting dye transfer, enzymes such as cellulases, lipases, etc., for special purposes.
  • the aim of the present invention was to compare the cleaning function and the function (s) of the substance (s) to be added in the rinse cycles, with the performance being as constant as possible the results, which can be achieved with a separate dosage, in one product or to allow the addition of further substances in the rinse cycles.
  • British Patent 1,390,503 discloses a liquid detergent which contains capsules which are insoluble in the composition but which release their contents when the composition is diluted with water. This goal is achieved in that the capsules are coated with a substance which has poor solubility in water solutions with high ionic strength, but becomes soluble when the ionic strength is reduced by dilution. It is pointed out that this technique can be used to include materials in the liquid detergent that are unstable in the liquid detergent itself, or would create instability if added directly. It is also suggested to use the technique to delay the release of a specific substance. The use in detergents is addressed. The encapsulated material is removed within 2 minutes after diluting the detergent with water, i.e. already released in the main wash cycle.
  • US Pat. No. 4,082,678 describes a fabric conditioning product which comprises a closed container which contains a releasable agent which serves to insoluble or non-dispersible an inner container arranged in the container, which is normally water-soluble or water-dispersible make, wherein the inner container contains a tissue conditioning agent.
  • the inner container consists of a substance whose solubility in water is strongly dependent on the ionic strength or the pH of the medium, and the agent which serves to render the inner container insoluble is a means of controlling the pH or the ionic strength.
  • Japanese patent application KOKAI 60-141705, 61-28440, 61-28441, 61-28596, 61-28597 and 61-28598 describe a process for producing pH-sensitive microcapsules for use in detergents.
  • the pH-sensitive coating is a copolymer of the following monomers:
  • R is hydrogen or a methyl group
  • R 1 and R 2 are each an alkyl group with 1-3 carbon atoms and x is an integer from 1-4;
  • the polymers described are said to be insoluble at pH 9.5 or more and to become soluble at pH 8.5 or less.
  • Different ingredients of detergent compositions are described, which can be coated successfully and effectively by the polymers described.
  • the aim of the invention described there is to protect substances that are only supposed to develop their function in the rinse cycle until the beginning and then to release them as soon as possible.
  • a disadvantage of the solution described in these Japanese patent applications is that the coated particles are in direct contact with non-alkaline wash water at the start of the washing cycle, which can result in the protective coating becoming detached.
  • a washing aid which is surrounded by a water-soluble coating which is obtained by mixing polyvinyl acetal dialkylaminoacetate and at least one organic acid which is solid at room temperature.
  • This protective covering is intended to protect the washing aid during the main wash cycle and to release it during the rinse cycles.
  • the described Binding reacts to the change in pH between the main wash cycle and the
  • the European patent application EP 0 481 547 AI discloses multi-layer dishwasher tablets with a core, a separating layer surrounding the core and an outer layer for the sequential release of the ingredients of the different layers. Basically, two tasks are to be solved with this tablet, namely 1) incompatible materials can be formulated together in a single tablet and released at different times in order to avoid mutual interference; and 2) Compositions that are designed to perform their functions at different times can be formulated in a single tablet.
  • the second major disadvantage of the prior art is that the temperature is used as a triggering factor for the initiation of the dissolution of the cladding layer, i.e. temperature-sensitive materials are used for the material of the casing. Since the temperature / time course in washing machines can vary greatly depending on the program selected, it would be difficult, if not impossible, to select a material for the wrapping that can be used for all possible programs in modern washing machines.
  • EP 0 481 547 AI itself admits (page 7, lines 37-43) that the selection of the material of the cladding layer must take into account device-specific and program-specific features. The practical usability of the products described is therefore clearly limited. Use in washing machines is not mentioned in the document.
  • PCT application WO 95/29982 discloses a delayed-release dishwashing detergent in the form of a non-ionic surfactant, this non-ionic surfactant, together with an inorganic builder salt, forming a core particle which is provided with a wax-like coating to compensate for the delayed release Ensure release.
  • This coating is a substance that does not melt at the working temperatures that can be found in the cleaning cycle, but is chemically disintegrated so gradually at alkaline pH that an effective amount of the rinse aid remains at the end of the main cleaning cycle and is transferred into the rinse cycle. Use in washing machines is not mentioned in the document.
  • a disadvantage of the solution presented in this document is that the coating is made soluble by chemical stranding at alkaline pHs, so that the time at which the rinse aid substance is released from the core is a function of both the temperature and the length of the main cleaning cycle .
  • the patent application contains no teaching on how to formulate a product with which the rinse aid is used in all washing programs each device type is released in the rinse cycle. After all, the product is a mixture of granular detergent and granular rinse aid particles.
  • the present invention is based on the object of creating a generic composition which can be used for most washing programs of various types of washing machine equipment and in each of these cases the substance (s) which have their effect essentially only in the rinse cycles should unfold, only in these releases.
  • the aim is to achieve this without largely restricting the selection for the detergent used, the substance (s) used for the rinse cycles and other ingredients of the composition.
  • this object is achieved with a generic composition which is characterized by a basic composition, which unfolds its function essentially in the main washing cycle of the washing machine, in the form of a tablet; and at least one particle, having at least one core, which comprises at least one substance which functions essentially in the rinse cycles of the washing machine, and an envelope, which completely surrounds the core (s) and comprises at least one compound, whose solubility increases with decreasing concentration of a specific ion in the surrounding medium; wherein the at least one particle is arranged in or on the tablet such that the surface of the particle (s) is at most partially in direct contact with the surface of the base composition surrounding it and the concentration of the specific ion in the local one
  • the area around the particle (s) is sufficiently high to substantially completely dissolve the tablet to prevent substantial disintegration of the envelope or substantial detachment of the envelope from the core (s).
  • the or all of the particles is or are received in at least one cavity of the tablet which is completely surrounded by the base composition and which has a larger volume than the or all of the particles which is or are received in the respective cavity or are.
  • the particle (s) can be loosely arranged in the interior of the cavity or, in another alternative, can be fixed. In the case of fixation in the interior of the cavity, this is preferably done using an adhesive.
  • the cavity is arranged essentially centrally in the interior of the tablet.
  • the invention further provides that the tablet has a single, substantially spherical cavity, in which a single, essentially spherical particle is preferably received, the outer diameter of which is smaller than the inner diameter of the cavity.
  • the or all of the particles are or are received in at least one cavity of the tablet which is only partially surrounded by the base composition.
  • the cavity is preferably a depression in one of the surfaces of the tablet in which the particle (s) is (are) at least partially received.
  • the particle (s) is (are) preferably received in the cavity or in the depression such that it (they) do not protrude above the surface (s) of the tablet.
  • the cavity or the depression has a substantially circular cross-sectional area parallel to one of the surfaces to which it opens or in which it is arranged.
  • the invention proposes that the cavity or the depression only opens to the surface (s) to such an extent that the particle (s) accommodated therein does not pass through the opening (s) of the cavity or the depression can pass through. It is preferably provided that the particle (s) is (are) loosely arranged in the cavity or in the depression.
  • the particle (s) is (are) fixed in the cavity or in the depression, this fixing preferably being carried out with an adhesive.
  • the base composition comprises at least one composition selected from the group consisting of a detergent composition, a water softener composition and a washing enhancer composition.
  • the covering comprises at least one compound which is insoluble or only slightly soluble at the concentration of the specific ion at the end of the main washing cycle of the washing machine and which is sufficiently soluble at the concentration of the specific ion in the rinse cycles that it is largely dissolved in the rinse cycles or detached from the core (from the cores) in such a way that an at least partial escape of the core material into the medium of the rinse cycles is made possible.
  • solubility of the compound increases with decreasing OH ion concentration and thus decreasing pH in the surrounding medium.
  • the invention proposes that the compound shows no or only a low solubility at a pH above 10 and that it has sufficient solubility at a pH below 9 that it is largely dissolved in the rinse cycles or is detached from the core (s) so that an at least partial escape of the core material into the medium of the rinse cycles is made possible.
  • This compound preferably comprises a polymer, particularly preferably a pH-sensitive polymer which comprises at least one repeating unit which has at least one basic function which is not part of the backbone chain of the polymer.
  • the polymer comprises at least one repeating unit which is based on a compound which is selected from the group consisting of vinyl alcohol derivatives, acrylates or alkyl acrylates which comprise said basic function.
  • the polymer is a carbohydrate, which is functionalized with said basic function.
  • the basic function mentioned above is preferably an amine, particularly preferably a secondary or tertiary amine.
  • the repeating unit is based on a connection with the following formula:
  • G is a linking group which is selected from -COO-, -OCO-, -CONH-, - NHCO -, - NHCONH -, - NHCOO -, -OCONH - or - OCOO -,
  • Ri independently of one another hydrogen or an alkyl group with Is 1-3 carbon atoms
  • R 2 is independently hydrogen or an alkyl group of 1-5 carbon atoms and x is an integer from 1 to 6.
  • the repetition unit is preferably based on a compound with the following formula TV:
  • Rj is independently hydrogen or an alkyl group with 1-3 carbon atoms
  • R is independently hydrogen or an alkyl group with 1-5 carbon atoms
  • x is an integer from 1 to 6.
  • the basic function is an imine or a basic aromatic N-containing group, preferably a pyridine group or an imidazole group.
  • the pH-sensitive polymer is a polymer derived from chitosan.
  • the invention proposes that the compound comprise K-carrageenan.
  • the core (s) comprise (s) at least one material selected from the group consisting of fragrances, fabric softeners, antistatic agents, agents for restoring the ability of the laundry for moisture absorption, mild acids, bleaching agents, disinfectants, agents for the long-term protection of both the laundry and the person wearing the laundry from insects or mites, agents for improved removal of grease soiling, agents for providing anti-crease, optical brighteners, ironing aids, agents for There is inhibition of dye transfer and enzymes.
  • the core or at least part of the cores can be in the form of an encapsulated liquid. In another embodiment, the core or at least some of the cores are in a solid form.
  • the invention further relates to a method for carrying out a washing cycle in a washing machine, in which the composition according to the invention is added to the medium in the washing machine at a suitable point in time during the prewash or main wash cycle.
  • this sufficient concentration of the specific ion by adding another composition, such as a detergent composition, to the medium of the main wash cycle is provided at a suitable time.
  • the composition according to the invention is characterized in that it delivers excellent results both in the main wash cycle and in the rinse cycles of a washing machine.
  • the tablet is released during the main wash cycle and can develop its intended effect (cleaning, water softening, washing intensification, etc.).
  • the particle arranged in or on the tablet contains, as the core material, that substance or substances which are intended to unfold their main function in the washing cycles of the washing machine.
  • This substance (s) is (are) protected by a sheath which, at the ion concentration, e.g. the pH value and the temperature of the main wash cycle are stable and do not dissolve or dissolve only insignificantly.
  • the particles according to the invention should be chosen so large that they are at least not discharged from the washing machine to a significant extent during the pumping out after the main wash cycle and the first rinse cycle . It is essential for the solution according to the invention that the surface of the particle is at most partially in direct contact with the surface of the basic composition of the tablet surrounding it. This can be done in the ways specifically described and illustrated in this application, but also in any other way with which the intended purpose is achieved. Examples are the loose arrangement of a smaller particle in a larger cavity and the fixing of a smaller particle in a larger cavity in such a way that there is no or only partial contact between the particle and the basic composition of the tablet, etc.
  • This constellation offers the advantage over the prior art that in the manufacturing process, e.g. the pressing of the individual components in successive steps, deformation and possibly consequent damage to the core (the cores) and / or the covering, which could reduce the protective effect of the covering of the core (the cores), can be reliably avoided.
  • By preventing pressure on the particle at any stage in the manufacturing process it can also be reliably prevented from "bleeding" into the material of the cladding and the outer layer at a given composition of the core (s) is coming.
  • it can be advantageous to avoid intimate full-surface contact with certain compositions of the covering or the base composition, since otherwise undesirable reactions could occur in the boundary layers.
  • the term “local environment”, as used in connection with the particle according to the invention, is intended to denote the immediate environment around this particle.
  • the ion concentration in this local environment of the particle is the determining factor for its stability Ion concentration in this local environment is determined at least until the tablet dissolves essentially completely by ions dissolving from it.
  • the origin of the "specific ion” is therefore - at least in the initial phase of the main wash cycle - a compound of the basic composition or tablet forming the tablet is generated by this in the surrounding medium. In the most typical case it is thereby in the case of the usual basic detergents around OH " ions, the concentration of which can be expressed as pH.
  • a (e.g. basic) detergent composition is used as the base composition, but e.g. a water softener composition or washing booster composition, the protection of the coating of the particle by a sufficiently high ion concentration in the local environment of the particle may only be ensured until the tablet is completely dissolved, namely in cases where the basic composition of the tablet is not sufficient for this It is able to provide a sufficiently high concentration of ions in the wash liquor. In these cases, the sufficiently high ion concentration in the wash liquor and thus also in the local environment of the particle (s) is achieved by dissolving the actual detergent (or another special additive).
  • Figure 1 shows a first embodiment of the composition according to the invention in cross section.
  • Fig. 5 shows a fifth embodiment of the composition according to the invention in cross section.
  • Fig. 1 shows a tablet 1, which consists of two half-tablets 2 and 3, which may have different or the same composition
  • a roughly hemispherical recess 4 or 5 can be seen approximately in the center of both half-tablets, which, when the tablet 1 is assembled, together has an approximately spherical one
  • Cavity in the tablet Both in the illustrated embodiment, in which the particle is loosely received in the cavity, and in an embodiment, where it is fixed by an adhesive provided in the intermediate space, it is ensured that there is no continuous, full-surface contact between the tablet material and the coating of the particle .
  • a conventional adhesive can be used to fix the particle in the cavity, but also other compositions and agents that serve the same purpose, for example mechanical fixation, such as e.g. sufficient friction between the tablet and particles in at least some places or a plug connection between the tablet and particles.
  • mechanical fixation such as e.g. sufficient friction between the tablet and particles in at least some places or a plug connection between the tablet and particles.
  • other compounds which preferably melt or dissolve during the main wash cycle are also possible as fixing agents between the particle and the tablet.
  • FIG. 2 shows a second embodiment of the composition according to the invention on the basis of a conventional 2-layer tablet 1.
  • the upper half-tablet 3 consists of two parts which both provide a sufficient cavity 5 for receiving the particle 6 and an opening to the side 11 of the tablet.
  • the particle 6 is therefore not completely surrounded by the basic composition of the tablet 1, so that it is visible from the outside in the interior of the tablet 1.
  • the particle in the cavity 5 can either be loosely received (provided that by appropriate selection of the size of the particle 6 on the one hand and the size of the opening of the cavity 5 to the side 11 of the tablet it is ensured that the particle or particles in the cavity do not pass through the opening can pass through) or be fixed in the interior of the cavity 5 by appropriate means, such as, for example, glue.
  • a third possible embodiment results from FIG. 3.
  • the basis is again a two-layer tablet.
  • a recess 4 is formed in the upper layer 2 by means of a suitable device.
  • the particle 6 is introduced, which in this case, since the recess on the side 11 of the tablet 1 is open to the extent that it would be possible for the particle to fall out of the recess without fixation, for example with an adhesive 10 or fixing intermediate layer or mechanically (for example by friction) in the recess.
  • this principle can also be applied to single-layer tablets.
  • the depression can have a substantially circular cross section parallel to side 11.
  • any number of other cross sections is also conceivable, for example any polygon.
  • the particle 6 accommodated in the depression 4 can assume any shape (such as ellipsoid, cylinder, cuboid, etc.) (and is independent of the shape of the depression 4). It can also be considered to fix the particle 6 'in a cavity open on both sides in the tablet, such as, for example, in a cylindrical hole 4' passing through a tablet body 1 'consisting of a layer 2', in which a corresponding hole cylindrical particle 6 'is fixed (Fig. 4a and b).
  • FIG. 5 A further possible embodiment results from FIG. 5. This is essentially constructed in the same way as the embodiment according to FIG Cores 8 "which are embedded overall in a casing 9". In this embodiment it is also possible, for example, to incorporate cores of different composition and different shape (encapsulated material or solid cores) into a particle 6 ".
  • the release of an acid in the washing cycles of a washing machine is intended both to remove incrustations and to neutralize alkaline residues.
  • Weak acids such as amidosulfonic acid and / or maleic acid, are advantageously used for this purpose.
  • These materials are usually Solids that can be provided directly with the intended coating, the coating process possibly having to be based on the corresponding substance (s).
  • the manufacturing process is as follows:
  • a mixture of 1.05 g of amidosulfonic acid and 0.45 g of maleic acid is formed into a tablet in a rotary press under a pressure of 890 kg / cm 2 .
  • 0.1975 g of fragrance is absorbed onto 0.0525 g of finely divided silica to give a free-flowing granular material.
  • the resulting 0.25 g is mixed with 0.6 g of microcrystalline cellulose and 0.15 g of cross-linked polyvinylpyrrolidone.
  • the mixture is tableted in a round press with an inner diameter of 10 mm under a pressure of 2900 kg / cm 2 to give an elliptical tablet with a height of 13.1 mm and a weight of approx. 1 g.
  • fragrances which are usually liquids, can also be presented as capsules containing the fragrance.
  • such cores can be made as follows: 1 g of chlorine bleach, eg pure sodium dichloroisocyanurate, can be compressed into a tablet in a suitable press under a pressure of 5,600 kg / cm 2 .
  • chlorine bleach eg pure sodium dichloroisocyanurate
  • the core comprises several substances which are intended to develop their respective effects in the washing cycle of a washing machine.
  • it is a combination of a fabric softener, an agent for reducing the build-up of static electricity in the fabric and an agent for improving the re-absorption of moisture by the fabric.
  • a slurry of 58% urea, 18% dimethyldistearylammonium chloride (DMDSAC) (90%), 8% of a C 9 . 11 alcohol, ethoxylated with 9 moles of ethylene oxide and 16% water was prepared.
  • the slurry was spray dried to obtain a granular material with a density of 580 g / l and the following composition: 68.8% by weight urea, 19.2% by weight DMDSAC, 9.5% by weight not -ionic surfactant and 2.5 wt .-% water.
  • the material for the sheath of the particle core (s) comprising the substance (s) which function essentially in the rinse cycle shows solubility , which depends on the concentration of a specific ion selected.
  • the cover in the main wash cycle is essentially insoluble and becomes soluble made and detaches from the particle when the ion concentration drops during the rinse cycles.
  • the ion concentration values that should be used in the screening of the polymers depend on the formulation of the base composition of the tablet into which the coated particle is to be incorporated.
  • the highest ion concentration used for the screening process should correspond to the concentration of the selected ion that is found in the wash liquor after the detergent has completely dissolved. Once this concentration is determined, the lower value for the ion concentration should be set 20 to 200 times below this higher value.
  • the materials to be examined are dissolved in solvents in which they are easily soluble.
  • the solutions are distributed on glass plates and then dried at room temperature until they have a constant weight.
  • the glass plates are placed in a beaker with test solution at a controlled temperature.
  • the solution is then stirred with a magnetic stirrer at a controlled stirring speed. After about 10 minutes, the glass plates are removed from the beaker and dried to constant weight at room temperature. The results are expressed as weight loss [%].
  • the screening methods must be adapted to the composition of the detergent, since this has the essential influence on the ion concentration or pH profile in the wash cycle.
  • the aim is to check the degree of solubility of the corresponding materials under different conditions, namely high or low ion concentration or pH.
  • Screening method 1 was carried out using buffer solutions as the medium for the simulation of the wash liquor.
  • two buffer solutions were prepared as follows:
  • pH 8 buffer solution 500 ml stock solution 500 ml dist. H 2 O 1, 23 gl N NaOH
  • pH 10 buffer solution 500 ml stock solution 500 ml dist. H 2 O 32.6 g 1N NaOH. Screening procedure 2:
  • Screening Procedure 2 was performed on the following detergent formulation to simulate the conditions in different stages of a wash cycle.
  • a spray-dried base material was made with the following composition:
  • Screening method 3 is used to screen for compounds whose solubility changes depending on the concentration of potassium ions.
  • the compounds determined using such screening methods can be used if, as described above, there is a correspondingly high concentration of potassium ions in the main wash cycle, which is correspondingly reduced by dilution in the rinse cycles.
  • the screening method 3 was carried out with the following formulation in order to simulate corresponding conditions.
  • the polymer was prepared in the customary manner by bulk polymerization.
  • the results of the screening tests were as follows:
  • Polymer 1 films were made from a 10% solution in isopropanol.
  • the invention is of course not limited to this exemplary polymer, although there is of course already a large variation possibility with regard to the polymers mentioned in Japanese patent applications KOKAI 60-141705, 61-28440, 61-28441, 61-28596, 61-28597 and 61-28597 or can be extended to compounds of the formula TV:
  • Ri is independently hydrogen or an alkyl group with 1-3 carbon atoms
  • R 2 is independently hydrogen or an alkyl group with 1-5 carbon atoms
  • x is an integer from 1 to 6.
  • G is a linking group which is selected from -COO-, -OCO-, -CONH-, - NHCO-, -NHCONH-, -NHCOO-, -OCONH- or -OCOO-, R, independently of one another hydrogen or an alkyl group with 1-5 carbon atoms and x is an integer from 1 to 6, for example polymers with a repeating unit can also be used, which are based on a compound of the formula V.
  • polymer 2 for example a pH-sensitive polymer (“polymer 2”) with the repeating unit VI, which is commercially available from the company SANKYO under the brand name AEA®,
  • polymers are (e.g. statistical) polymers derived from chitosan based on the following monomer units IX and X
  • K-Carrageenan Another ion concentration-sensitive polymer is the polysaccharide K-carrageenan, which has been found in screening method 3 (see example 2) to be a polymer which is dependent on the potassium ion concentration in the surrounding medium in terms of its solubility.
  • K-Carrageenan is represented by the following formula XI:
  • Polymer 4 This polymer, designated "Polymer 4", was tested according to screening method 3 described above:
  • Example 1 The different cores described in Example 1 were used as the basis for the production of particles according to the invention. These cores were provided individually or in groups (FIG. 5) with a covering in a device for applying a film coating, as is known from the pharmaceutical industry (for example from the companies Loedige, Huettlin, GS, Manesty and Driam).
  • the core (s) can (s) first apply a coating before applying this covering Protective cover can be provided.
  • a coating such as, for example, cellulose, cellulose derivatives, polyvinyl alcohol, polyvinyl alcohol derivatives and mixtures thereof.
  • a protective coating was used in cases 1a, 1b and 1c, a 10% strength by weight aqueous solution of the polyvinyl alcohol Mowiol® 5-88 (Clariant) being used here.
  • the core was coated with 0.76 g of such a solution, in the case of Example 1b, 0.40 g of the same solution was used and in the case of Example 1c, 0.29 g of the same solution was used.
  • the covering can in principle be applied to the core (s) or the protective coating in any quantity and thickness, as long as it is ensured that the covering detaches or dissolves quickly enough in the rinsing cycles so that the core (in the substance (s) contained in the kernels can have their effect (s).
  • 1-10% by weight, preferably 4-8% by weight, of the coating material (dry mass) sensitive to ion concentration, based on the mass of the entire particle, is applied to the cores.
  • the particles according to the invention should preferably have a size such that they are not, or at least not to a considerable extent, removed from the washing machine by the pumping-down processes after the main wash cycle or the individual rinse cycles.
  • a size of approximately 1 cm in diameter is usually sufficient for this. Smaller or larger dimensions can of course be chosen as long as the functionality is guaranteed overall.
  • Polymer 1 from Example 3 was used as the coating for the further tests and applied as a 10% strength solution of the polymer in 0.055 N aqueous HC1.
  • Tablets of this type can be produced by pressing the pulverulent ingredients in machines which are known in principle from the prior art and using operating parameters which are fundamentally known from the prior art.
  • the composition of such tablets is based on commercially available products.
  • a detergent tablet, a water softener tablet and a washing intensifier tablet are described below by way of example.
  • composition for a detergent tablet can be mixed, for example, on the basis of a detergent formulation as shown in Example 2, Tables 2 and 3.
  • the resulting granular composition has a bulk density of approximately 690 g / l and can be tabletted in an appropriate compression under a pressure of 21 kg / cm to give a half-tablet, with a weight, of approximately 20 g.
  • a fixing substance e.g. an adhesive (for example, polyethylene glycol, polyvinyl ether, polyvinyl alcohol, silicate, preferably melted PEG 4000) is applied to the corresponding surface of the half tablet and, if appropriate, also to the particle, and the second half tablet is pressed onto the first half tablet with particles according to the invention.
  • an adhesive for example, polyethylene glycol, polyvinyl ether, polyvinyl alcohol, silicate, preferably melted PEG 4000
  • the resulting granular composition is tableted under a pressure of 150 kg / cm to give a half-tablet with a recess weighing about 8 g.
  • a depression is formed in the upper layer, into which first adhesive or the like and then the particle according to the invention is added.

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  • Detergent Compositions (AREA)

Abstract

L'invention concerne une composition se présentant sous la forme d'une pastille, pour utilisation dans un lave-linge. Cette composition est caractérisée par une composition de base qui agit principalement lors du cycle de lavage principal du lave-linge et par au moins une particule. Cette particule présente d'une part au moins un noyau comprenant au moins une substance qui agit principalement lors du cycle de rinçage du lave-vaisselle, et d'autre part un enrobage entourant pratiquement la totalité du ou des noyaux et comprenant au moins un composé dont la solubilité augmente lorsque la concentration d'un ion spécifique dans le milieu ambiant diminue. La ou les particules sont placées dans ou sur la pastille de sorte que la surface de la ou des particules soit tout au plus partiellement en contact direct avec la surface de la composition de base entourant la ou les particules. La concentration de l'ion spécifique dans le milieu ambiant de la ou des particules jusqu'à la dissolution pratiquement totale de la pastille est suffisamment élevée pour empêcher pratiquement une dissolution de l'enrobage ou une séparation de l'enrobage du ou des noyaux. L'invention concerne également un procédé pour effectuer un cycle de lavage d'un lave-linge en utilisant la composition selon l'invention.
EP99939398A 1998-07-29 1999-07-23 Composition pour utilisation dans un lave-linge Ceased EP1019486A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19834179 1998-07-29
DE19834179 1998-07-29
PCT/EP1999/005264 WO2000006683A1 (fr) 1998-07-29 1999-07-23 Composition pour utilisation dans un lave-linge

Publications (1)

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EP1019486A1 true EP1019486A1 (fr) 2000-07-19

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EP99939398A Ceased EP1019486A1 (fr) 1998-07-29 1999-07-23 Composition pour utilisation dans un lave-linge

Country Status (5)

Country Link
US (1) US6660704B1 (fr)
EP (1) EP1019486A1 (fr)
AU (1) AU5371399A (fr)
CA (1) CA2304526A1 (fr)
WO (1) WO2000006683A1 (fr)

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Also Published As

Publication number Publication date
WO2000006683A1 (fr) 2000-02-10
CA2304526A1 (fr) 2000-02-10
US6660704B1 (en) 2003-12-09
AU5371399A (en) 2000-02-21

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