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
  • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
  • C11D3/16—Organic compounds
  • C11D3/26—Organic compounds containing nitrogen
  • C11D3/33—Amino carboxylic acids
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
  • C11D3/39—Organic or inorganic per-compounds
  • C11D3/3942—Inorganic per-compounds

Definitions

• the present invention is in the field of machine dishwashing. More specifically, the invention encompasses automatic dishwashing detergents and their use in a dish washing process.
• a consumer would use three products to wash dishes in an automatic dishwashing machine.
• Salt would be added to the salt compartment to soften water.
• a dishwashing detergent composition would serve to clean the articles, and a rinse aid would be used in the final steps of the dishwashing process to avoid streaks and smears on the articles.
• multifunctional products have been developed in recent years, such as 4-in-l and 5-in-l detergent products have been developed, i.e. with glass protection functionality and/or water-soluble wraps. All these products are further referred to as multifunctional compositions .
• This product shift has greatly improved the ease of handling for consumers .
• a builder generally serves to improve and extend the action of surfactant.
• a builder may provide this contribution in a number of ways, e.g. by binding of calcium and magnesium ions, binding of transition metal ions, peptisation and suspension of soil in solution, provision of alkalinity and structuring/solubilising powder. It also can contribute in the prevention of non-optimal functioning of surfactants.
• the binding of calcium and magnesium is the most relevant function among these.
• the builder system is preferably water-soluble.
• the most widely known builder is sodium tripolyphosphate .
• a well known draw back of this builder is that it contains phosphorus. Many attempts have been made to (partly) replace this builder with one that is more environmentally friendly but still shows the desired functionality.
• Suitable replacers include carbonate, citrate, zeolite, silicate and amino polycarboxylic compounds such as methylglycine diacetic acid (MGDA) and variants thereof e.g. NTA (nitrile triacetic acid), GDA (glutamic diacetic acid) , DPA (dipicolinic acid) and IDS (imino disuccinic acid) .
• MGDA methylglycine diacetic acid
• NTA nitrile triacetic acid
• GDA glutmic diacetic acid
• DPA dipicolinic acid
• IDS imino disuccinic acid
• amino polycarboxylate compounds such as methylglycine diacetic acid in detergent compositions is known from the prior art, e.g. US 6,162,259, US 6,172,036, US 6,376,449, US 6,159,922, US 6,770,616.
• MGDA methylglycine diacetic acid
• IDS iminodiacetic acid
• bleaching agents in machine dishwash detergent are commonly known. These components are in particular applied for their cleaning performance. Examples of commonly applied bleaching agents are monopersulphate, perborate monohydrate, perborate tetrahydrate, and percarbonate . These days, legislation around the use of perborate has led to the general application of percarbonate as the main bleaching agent in machine dishwash compositions. In order to arrive at the desired performance of cleaning, percarbonate is usually applied in amounts of 15-20 wt%. The use of lower amounts is commonly known to result in undesired reduced cleaning performance .
• An object of the current invention is to provide a machine dishwash detergent composition comprising amino polycarboxylate compounds selected from MGDA and IDS, and preferably MGDA, as detergency builder and percarbonate, the composition having a good stability both on production and storage, and the composition having a good cleaning performance.
• Another object of the current invention is to provide a machine dishwash detergent composition which is substantially free of phosphate, and comprises amino polycarboxylate compounds selected from MGDA and IDS, and preferably MGDA, and percarbonate which shows a further improved stability of said composition and which provides some protection for metal corrosion .
• the invention provides a machine dishwash detergent composition which is substantially free of phosphate, and comprises an amino polycarboxylic compound selected from methylglycine diacetic acid (MGDA) and iminodiacetic acid (IDS), in an amount of at least 25 wt%, preferably between 25 and 70 wt%, and a bleaching agent comprising percarbonate, the percarbonate amount being in the range of 3 to 12 wt% based on total weight of the composition.
• the amino polycarboxylic compound comprises methylglycine diacetic acid and/or its corresponding salts.
• a method for cleaning dishware in a mechanical dishwashing machine comprising treating the dishware with a wash liquor comprising a dishwashing composition of the invention.
• the invention relates to the use of a dishwashing composition according to the invention for use in an automatic dishwashing machine, such that no salt is required for the rejuvenation of ion exchange material within the machine .
• Weight percentages (indicated as ⁇ wt%' ) herein are calculated based upon total weight of the composition, unless indicated otherwise.
• Substantially free of means a maximum concentration of the compound concerned of 1 wt% based on the weight of the detergent composition.
• Machine dishwash detergent compositions according to the invention may suitably be dosed in the wash liquor at levels of from 2 g/1 to 10 g/1.
• the invention is in particular suitable for multifunctional machine dishwash detergent compositions.
• benefits can be achieved by applying the invention to a detergent composition in which a separate rinse aid is used in the final steps of the dishwashing process.
• the detergent composition is a multifunctional machine dishwash composition.
• the invention in all of its embodiments is in particular beneficial for detergent compositions which are in particulate form.
• the particulate detergent composition may be in powder form or tablet form, or a combination thereof.
• compositions of the invention will contain one or more amino polycarboxylic compounds. These compounds act as builders, and bind ions like magnesium and calcium.
• the amino polycarboxylic compound is selected from methylglycine diacetic acid (MGDA) and iminodiacetic acid (IDS) .
• MGDA methylglycine diacetic acid
• IDS iminodiacetic acid
• the most preferred type of amino polycarboxylic compound is MGDA.
• composition comprises a further builder which may be selected for example from the group comprising alkali metal carbonates, bicarbonates, borates and zeolites.
• the amount of amino polycarboxylic compound, preferably MGDA is at least 25 wt%, and is preferably between 25 and 70 wt% of the total composition, more preferred between 25 and 60 wt%, and most preferred between 30 and 45 wt%.
• An amount of about 30, 35 or 40 wt% of MGDA was found to lead to good results on all aspects in the detergent composition of the current invention.
• the form in which the MGDA and/or IDS and/or their salts can be applied in the compositions can be any, and for this invention is preferably the form of a powder or a granule.
• compositions of the present invention are substantially free from phosphate containing builders.
• phosphate containing builders are tripolyphosphates, hexametaphosphate, orthophosphate, and the alkali metal salts thereof.
• the amount of percarbonate present is in the range of 3-12 wt%. It was found that despite these low amounts of percarbonate present, very good cleaning performance is obtained. Such good results are in particular found when the amount of percarbonate is at least 5%, and preferably between 5 and 11 wt%. Even further preferred the amount is between 7 and 11 wt%, most preferred it is between 8 and 11 wt%, and highly preferred it is about 9 or 10 wt%, based on total composition.
• the percarbonate material used is coated.
• the coating of the material can be done by, for example, crystallisation or by spray granulation. Suitable coated percarbonate material is described in, for example, EP 891417, EP 136580 and EP 863842. The use of spray granulated coated percarbonate is most preferred.
• the machine dishwash composition comprises 30-45 wt% of MGDA, and 8-11 wt% of a spray granulated coated percarbonate.
• compositions of the invention have a good stability both on production and storage. In particular, good cleaning performance is obtained while the degradation of the product is reduced compared to the percarbonate products on the market these days.
• the stability can suitably be measured by using a Thermal Activity Monitor (TAM) , a multichannel microcalorimeter as for example supplied Thermometric .
• TAM Thermal Activity Monitor
• Thermometric The object of the TAM measurement is to quantify the thermal activity of a product. The higher the thermal activity, which originates from reaction of ingredients, the greater the risk for product degradation under storage conditions.
• a sample is maintained at a constant temperature. Prior to the measurement the TAM apparatus is equilibrated at the desired measurement temperature, which typically is 40 or 50°C. The tablet is broken in half, and placed in a 25 ml vial in the apparatus. For measuring the heat generation in a powder, 10 gram of the powder is placed in the vial. The heat flow is recorded during at least 48 hrs . The value after exactly 48 hour is taken, and divided by the weight of the sample. The resulting TAM value is expressed in ⁇ W/g (micro Watt per gram) .
• compositions according to the invention are prepared that have a TAM value of less than 70 ⁇ W/g. at 50 0 C, and further preferred a TAM value of less than 60 ⁇ W/g. at 50°C.
• silicates In commonly used detergent formulations not according to the current invention, silicate is present in amounts up to 30 wt% or even higher, around 50 wt%. Purpose of the silicate in those known compositions is often to prevent fading of colours on glaze porcelain and decorated glasses via corrosion, as well as on enamel and metal corrosion.
• the amount of silicate used is selected in the range of 3 to 6 wt%.
• a further improvement comprises a dishwash composition containing at least 25 wt% MGDA, preferably between 25 and 70 wt%, 3 to 12 wt% percarbonate, and 3 to 6 wt% silicates .
• silicate levels indicated in the specification are calculated as Si ⁇ 2.
• the silicate is chosen from the group of alkali metal silicates.
• the silicate may provide pH adjusting capability and protection against corrosion of metals and against attack on decor on dishware, including fine china and glassware benefits.
• the alkali metal silicate is hydrous, having from 15% to 25% water, more preferably, from 17% to 20%.
• the highly alkali metasilicates can in principle be employed, but in general, yield too high a pH to be suitable for application in the compositions of the current invention. Therefore, the less alkaline hydrous alkali metal silicates having a Si ⁇ 2:M 2 O ratio of from 2.0 to 2.4 are, greatly preferred. Anhydrous forms of the alkali metal silicates with a Si ⁇ 2:M 2 O ratio of 2.0 or more are less preferred because they tend to be significantly less soluble than the hydrous alkali metal silicates having the ratio of less than 2.
• alkali metal silicates sodium and potassium, and especially sodium, silicates are preferred.
• a particularly preferred alkali metal silicate is a granular hydrous sodium silicate having a Si ⁇ 2:Na2 ⁇ 0 ratio of from 2.0 to 2.4. Most preferred is a granular hydrous sodium silicate having a Si ⁇ 2:Na2 ⁇ 0 ratio of 2.0, in particular for application in machine dishwash detergent compositions applied in powder or tablet form. While typical forms, i.e. powder and granular, of hydrous silicate particles are suitable, preferred silicate particles having a mean particle size between 300 and 900 ⁇ m and less than 40% smaller than 150 ⁇ m and less than 5% larger than 1700 ⁇ m. Particularly preferred is a silicate particle with a mean particle size between 400 and 700 ⁇ m with less than 20% smaller than 150 ⁇ m and less than 1% larger then 1700 ⁇ m.
• nonionic surfactants may be present in the compositions of the invention.
• the compositions of the invention can contain a total amount of nonionic surfactants in the compositions of up to 10 wt%, more preferred up to 7 wt%, most preferred up to 5 wt% of a nonionic when surfactant is present.
• the total amount of nonionic surfactants present in the compositions is at least 0.5 wt%, more preferred at least 0.8 wt%.
• the total amount of nonionic surfactants in the compositions is in the range of 1 to 5 wt% of the total composition.
• nonionic surfactants may include any alkoxylated nonionic surface-active agent wherein the alkoxy moiety is selected from the group consisting of ethylene oxide, propylene oxide, butylene oxide, and mixtures thereof.
• the nonionic surfactants are preferably used to improve the detergency and to suppress excessive foaming due to protein soil.
• suitable nonionic surfactants are low- to non-foaming ethoxylated and/or propoxylated straight chain fatty alcohols.
• a further improvement of phosphate free machine dishwash compositions containing amino polycarboxylate compounds such as MGDA, and percarbonate was found when less than 2 wt% of nonionic surfactants with a melting point of less than 35°C is present in the composition.
• Machine dishwash compositions comprising one or more nonionic surfactants with a melting point above 35°C are preferred.
• Another preferred embodiment contains less than 2 wt% of nonionic surfactants with a melting point of less than 35°C and contains one or more nonionic surfactants with a melting point above 35°C.
• At least one nonionic surfactant has a melting point higher than 40 0 C.
• the amount of the nonionic surfactant with a melting point higher than 35°C in the composition is preferably at least 0.5 wt%. More preferably the amount is at least 0.8 wt%, most preferred at least 1.5 wt%, based on the weight of the total composition.
• the dishwash composition comprises at least 25 wt% MGDA, preferably between 25 and 70 wt%, 3 to 12 wt% percarbonate, less than 2 wt% of nonionic surfactants with a melting point of less than 35°C.
• a further improvement comprises a dishwash composition comprises at least 25 wt% MGDA, preferably between 25 and 70 wt%, 3 to 12 wt% percarbonate, less than 2 wt% of nonionic surfactants with a melting point of less than 35°C, and at least 0.5 wt%, preferably at least 0.8 wt% of a nonionic surfactant with a melting point higher than 35°C.
• a further improvement of this embodiment involves the use of a nonionic surfactant with a melting point higher than 35°C, that is a low foaming nonionic surfactant.
• a preferred nonionic surfactant with a melting point higher than 35°C is selected from hydroxyalkyl glycolether surfactants having a melting point above 35°C, preferably above 40 0 C.
• a preferred class of such materials has from 6 to 20, preferably from 8 to 18, most preferred from 10 to 18 carbon atoms in the alkyl chain thereof and from 15 to 50, preferably from 20 to 40 glycol ether units.
• An example of compounds from this group is the class of modified fatty alcohol polyglycolethers .
• nonionic surfactants of this group are high melting point polyalkoxylated alcohols, optionally with the -OH group endcapped such as with an alkyl group and typically having an average of 10 to 20 alkyl groups and more than 30 alkylene oxide groups, e.g. ethylene oxide and/or proplylene oxide groups .
• At least 50 wt% of the total amount of nonionic surfactants is a nonionic surfactant that has a melting point higher than 35°C, more preferred at least 60 wt%, and most preferred at least 65 wt%.
• up to 90% or even 100% by weight of the total nonionic surfactants are selected from nonionic surfactants that have a melting point higher than 35°C.
• the high melting point nonionics can be added to the composition in different ways. They can be added, for example by CO- extrusion with the amino polycarboxylic compound, by co- granulation, or the like. We have found that the benefits described in this description are also obtained by simple addition of granules of the high melting nonionics to all or part of the ingredients in the preparation of the composition.
• compositions may comprise anionic surfactants. If present, the total amount thereof should be at levels of less than 5 wt%, and preferably at levels of 2 wt% or below. Furthermore, if any anionic surfactant is present, it is preferred that an antifoam agent to suppress foaming is present.
• the invention provides a machine dishwash composition which is substantially free of phosphate, and comprising 25 to 70 wt% MGDA, 3 to 12 wt% percarbonate, 2 to 7 wt% silicate, less than 2 wt% of nonionic surfactants with a melting point of less than 35°C and at least 0.5 wt% of one or more nonionic surfactants with a melting point above 35°C.
• percarbonate bleach material In addition to the percarbonate bleach material other bleach components may be present in the composition.
• inorganic bleaching agents both the peroxygen bleaching agents as well as chlorine- or bromine-releasing agents are suitable for inclusion in the machine dishwashing compositions.
• 1-5 wt% of a chlorine bleaching agent may be used.
• Peroxygen based bleach materials are however preferred.
• the bleach material can completely or partially be encapsulated.
• Inorganic peroxygen-generating compounds are also typically used as the bleaching material of the present invention.
• these materials are acids and corresponding salts of monopersulphate, perborate monohydrate, and perborate tetrahydrate .
• Monoperoxy acids useful herein include alkyl peroxy acids and aryl peroxyacids such as peroxybenzoic acid and ring-substituted peroxybenzoic acids (e.g. peroxy-alpha- naphthoic acid) , aliphatic and substituted aliphatic monoperoxy acids (e.g. peroxylauric acid and peroxystearic acid), and phthaloyl amido peroxy caproic acid (PAP) .
• alkyl peroxy acids and aryl peroxyacids such as peroxybenzoic acid and ring-substituted peroxybenzoic acids (e.g. peroxy-alpha- naphthoic acid) , aliphatic and substituted aliphatic monoperoxy acids (e.g. peroxylauric acid and peroxystearic acid), and phthaloyl amido peroxy caproic acid (PAP) .
• PAP phthaloyl amido peroxy caproic acid
• Typical diperoxy acids useful herein include alkyl diperoxy acids and aryldiperoxy acids, such as 1, 12-di-peroxy-dodecanedioic acid (DPDA), 1, 9-diperoxyazelaic acid, diperoxybrassylic acid, diperoxysebacic acid and diperoxy-isophthalic acid, and 2-decyldiperoxybutane-l, 4-dioic acid.
• DPDA 1, 12-di-peroxy-dodecanedioic acid
• DPDA 1, 9-diperoxyazelaic acid
• diperoxybrassylic acid diperoxysebacic acid and diperoxy-isophthalic acid
• 2-decyldiperoxybutane-l, 4-dioic acid 2-decyldiperoxybutane-l, 4-dioic acid.
• Peroxyacid bleach precursors are well known in the art. As non- limiting examples can be named N, N, N ' , N ' -tetra- acetylethylenediamine (TAED) , sodium nonanoyloxybenzene sulphonate (SNOBS), sodium benzoyloxybenzene sulphonate (SBOBS) and the cationic peroxyacid precursor (SPCC) as described in US 4,751,015.
• TAED sodium nonanoyloxybenzene sulphonate
• SBOBS sodium benzoyloxybenzene sulphonate
• SPCC cationic peroxyacid precursor
• a bleach catalyst such as the manganese complex, e.g. Mn-Me TACN, as described in EP 458 397 A, or the sulphonimines of US 5,041,232 and US 5,047,163, may be incorporated. This may be presented in the form of an encapsulate separately from the percarbonate bleach granule. Cobalt catalysts may also be used.
• a suitable range is from 0.5% to 3% avO (available Oxygen) .
• the amount of bleach material in the wash liquor is at least 0.00125 wt% and at most 0.03 wt% avO by weight of the liquor.
• composition of the invention may comprise a water soluble salt of bismuth.
• a soluble salt of bismuth is meant, unless indicated otherwise.
• the level of water soluble bismuth salt in the machine dishwash detergent composition of the invention is preferably less than or equal to 3 wt%, based on the total composition.
• the composition of the invention contains effectively at least 0.05 wt%. Accordingly, in a preferred embodiment, the composition of the invention comprises from 0.05 wt% to 3 wt%, based on the total composition, of bismuth. In a further preferred embodiment the composition contains 0.1 to 2 wt% of the water soluble salt of bismuth .
• Water soluble bismuth salts suitable for use in the detergent compositions of the invention are in particular selected from the group of bismuth acetate, acetate dihydrate, bromide, butyrate, citrate, citrate dihydrate, chloride, iodide, iodide dihydrate, caproate, formate, formate dihydrate, fumarate, gluconate, glycinate, lactate, malate, maleate, nitrate, nitrate trihydrate, nitrate hexahydrate, phenolsulphonate, sulphate monohydrate, sulphate heptahydrate, sulphate hexahydrate, salicylate, succinate, tartrate, valerate, saccharinate, and carboxymethyl oxysuccinate . It is preferred to use a water soluble bismuth salt composition chosen from the group of acetate, formate, and sulphate. Mixtures of any of the salts mentioned can also be used.
• the machine dishwash detergent composition comprises at least one dispersing polymer.
• Dispersing polymers as referred to in this invention are chosen from the group of anti-spotting agents and/or anti-scaling agents.
• anti-spotting polymeric agents examples include hydrophobically modified polyacrylates, whereas also synthetic clays, and preferably those synthetic clays which have a high surface area are very useful to prevent spots, in particular those formed where soil and dispersed remnants are present at places where the water collects on the glass and spots formed when the water subsequently evaporates.
• Antispotting systems such as hydrophobically modified polyacrylates are advantageous in the so called multifunctional systems.
• suitable anti-scaling agents include organic phosphonates, amino carboxylates, polyfunctionally-substituted compounds, and mixtures thereof.
• Particularly preferred anti-scaling agents are organic phosphonates such as ⁇ -hydroxy-2-phenyl ethyl diphosphonate, ethylene diphosphonate, hydroxy-1, 1-hexylidene, vinylidene 1,1- diphosphonate, 1, 2-dihydroxyethane-l, 1-diphosphonate and hydroxy-ethylene-1, 1-diphosphonate .
• Most preferred is hydroxy- ethylene-1 , 1-diphosphonate (EDHP) and 2-phosphono-butane-l, 2, 4- tricarboxylic acid.
• water soluble dispersing polymers prepared from an allyloxybenzenesulfonic acid monomer, a methaiIyI sulfonic acid monomer, a copolymerizable nonionic monomer and a copolymerizable olefinically unsaturated carboxylic acid monomer as described in US 5,547,612 or known as acrylic sulphonated polymers as described in EP 851 022.
• Polymers of this type include polyacrylate with methyl methacrylate, sodium methallyl sulphonate and sulphophenol methallyl ether.
• a terpolymer containing polyacrylate with 2-acrylamido-2 methylpropane sulphonic acid as well as phosphonated polyacrylates, and ethoxylated polycarboxylates .
• polymers and co-polymers of acrylic acid having a molecular weight between 500 and 20,000 can also be used, such as homo-polymeric polycarboxylic acid compounds with acrylic acid as the monomeric unit.
• the average weight of such homo-polymers in the acid form preferably ranges from 1,000 to 100,000 particularly from 3,000 to 10,000.
• polycarboxylates co-polymers derived from monomers of acrylic acid and maleic acid are also suitable.
• the average molecular weight of these polymers in the acid form preferably ranges from 4,000 to 70,000.
• mixtures of anti-scaling agents may be used, particularly useful is a mixture of organic phosphonates and polymers of acrylic acid with methyl methacrylate, sodium methaiIyI sulfonate .
• the level of anti-scaling agent is from 0.2 to 15 wt% of the total composition, preferably from 0.5 to 10 wt%, and further preferred 1 to 8 wt%.
• Enzymes may be present in the compositions of the invention.
• Examples of enzymes suitable for use in the cleaning compositions of this invention include lipases, peptidases, amylases (amylolytic enzymes) and others which degrade, alter or facilitate the degradation or alteration of biochemical soils and stains encountered in cleansing situations so as to remove more easily the soil or stain from the object being washed to make the soil or stain more removable in a subsequent cleansing step. Both degradation and alteration can improve soil removal.
• the composition of the invention also contains a proteolytic enzyme. Enzymes may be present in a weight percentage amount of from 0.2 to 7% by weight.
• Anti-tarnishing agents such as benzotriazole and those described in EP 723 577 may also be included.
• Optional ingredients are, for example, buffering agents, reducing agents, e.g., borates, alkali metal hydroxide and the well-known enzyme stabilisers such as the polyalcohols, e.g. glycerol and borax, crystal-growth inhibitors, threshold agents, perfumes and dyestuffs and the like.
• buffering agents e.g., borates, alkali metal hydroxide and the well-known enzyme stabilisers
• the polyalcohols e.g. glycerol and borax
• crystal-growth inhibitors e.g. glycerol and borax
• threshold agents e.g. glycerol and borax
• perfumes and dyestuffs and the like e.g. modified starches.
• Reducing agents may be used, e.g., to prevent the appearance of an enzyme-deactivating concentration of oxidant bleach compound.
• Suitable agents include reducing sulphur-oxy acids and salts thereof.
• Most preferred for reasons of availability, low cost, and high performance are the alkali metal and ammonium salts of sulphuroxy acids including ammonium sulphite ( (NH 4 ) 2SO3), sodium sulphite (Na2SO3) , sodium bisulphite (NaHSOs) , sodium metabisulphite (Na2S2 ⁇ 03) , potassium metabisulphite (K2S2O5) , lithium hydrosulphite (Li 2 S2 ⁇ 4 ) , etc., sodium sulphite being particularly preferred.
• Another useful reducing agent is ascorbic acid.
• the amount of reducing agents to be used may vary from case to case depending on the type of bleach and the form it is in, but normally a range of about 0.01 wt% to about 1.0 wt%, preferably from about 0.02 wt% to about 0.5 wt%, will be sufficient.
• the composition according to the invention comprises a rinse aid composition/ingredient.
• Rinse aid ingredients are ingredients that effect that final appearance of the table ware that is washed.
• a method for cleaning dishware in a mechanical dishwashing machine comprising treatment of the dishware with a wash liquor comprising a dishwashing composition according to the invention as specified before.
• minimal rejuvenation of ion exchange material within the machine is needed.
• the compositions especially suitable for this use are multifunctional compositions.
• the invention relates to the use of a dishwashing composition according to the invention for use in an automatic dishwashing machine, such that no salt is required for the rejuvenation of ion exchange material within the machine .
• compositions are powders and tablets and mixtures thereof.
• the compositions are unit dose compositions such as tablets.
• Unit dose compositions such as tablets may be wrapped in a water soluble wrap for easy handling.
• a tablet is understood to be a compressed particulate composition that can be considered to be a solid shaped body.
• the detergent tablets of the present invention can be monophase tablets, as well as multiphase tablets. These phases may have a different colour and each phase may comprise different ingredients, which may be active in the sequential steps of washing.
• the phases of the multiphase detergent tablet are preferably separate layers within the tablet. However, a discrete region of a tablet could also have any other form, for example one or more cores, or inserts, in the form of a sphere.
• the detergent tablet of the present invention is a three-layer tablet, in which the upper and bottom layer substantially have the same composition, while the middle layer has a different composition.
• 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. In general the upper and lower surfaces of the tablet are substantially flat.
• the overall density of a tablet preferably lies in a range from 1000 up to 1700 g/L.
• the phases of the preferred tablet together have a weight of 5 to 70 gram, more preferred 10 to 40 gram.
• the weight of the tablets depends on the conditions of intended use, and whether it represents a dose for an average load in a dishwashing machine or a fractional part of such a dose.
• machine dishwash detergent compositions according to the invention may suitably be dosed in the wash liquor at levels of from 2 g/1 to 10 g/1.
• Machine dishwash detergent tablets were prepared using the formulations as indicated in Table I .
• 50kg of each of the powder compositions indicated in the Table was prepared in a 130 1. high shear ploughshare mixer.
• the bulk materials methylglycine diacetic acid, sodium sulphate, and sodium bicarbonate are dosed to the mixer first, followed by the spraying of the liquids onto the powder in approximately 30 seconds. After spraying, the minor components are dosed to the mixer and the powder is mixed for 1.5 minute before discharging into drums.
• Triple layer tablets in this example are produced on a rotary tablet press with 3 dosing stations.
• the white powder was used for the top and bottom layer compositions and the green powder was used for the middle layer compositions.
• the turret of the machine is equipped 37 punch stations with a length of 36 mm and a width of 26 mm. In dosing stations 1 and 3 the particulate compositions of the top and bottom layer are dosed, and in dosing station 2 the particulate compositions of the middle layer are dosed.
• the turret speed is set on 5 rpm.
• Tablets are compressed by first dosing (station 1) 8 g of the particulate compositions of the top and bottom layer, followed by (station 2) 3 g of the particulate composition of the middle layer, and again (station 3) 7 g particulate compositions of the top and bottom layer.
• station 1 8 g of the particulate compositions of the top and bottom layer
• station 2 3 g of the particulate composition of the middle layer
• station 3 7 g particulate compositions of the top and bottom layer.
• TAM Thermal Activity Monitor
• Powder preparation was as described in example 1. From the powder, tablets were made as described in example 1. Of all tablets, the stability was measured using the Thermal Activity Monitor (TAM) as described in this patent specification, whereby the TAM apparatus is equilibrated at 50 0 C. TAM values found were
• the cleaning efficiency behaviour of tablets C, and comparative examples II and III were tested in a dishwashing machine.
• the dishwash machine used was a Miele G651SC plus, that was cleaned before start of the test.
• the programme was 50 0 C normal.
• the diswash product is dosed via the dispenser, and water hardness was 27/9°FH.
• the machine was loaded with soiled plates, glasses and cutlery.
• the dishwash programme is started. After the wash programme, the (clean) dishes are scored on residual soil and against completely clean dishes.

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