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
  • C11D3/02—Inorganic compounds ; Elemental compounds
  • C11D3/12—Water-insoluble compounds
  • C11D3/124—Silicon containing, e.g. silica, silex, quartz or glass beads
• • 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
  • C11D3/02—Inorganic compounds ; Elemental compounds
  • C11D3/12—Water-insoluble compounds
  • C11D3/1213—Oxides or hydroxides, e.g. Al2O3, TiO2, CaO or Ca(OH)2
• • 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
  • C11D3/37—Polymers
  • C11D3/3746—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • C11D3/3757—(Co)polymerised carboxylic acids, -anhydrides, -esters in solid and liquid compositions
  • C11D3/3761—(Co)polymerised carboxylic acids, -anhydrides, -esters in solid and liquid compositions in solid compositions

Definitions

• the present invention relates to an automatic dishwasher detergent composition having improved anti-filming properties.
• the present invention is particularly directed to a stable dry powder detergent composition containing an anti-filming agent for use in an automatic dishwasher to clean dishware, glassware and the like.
• the present invention more particularly relates to a powder automatic dishwashing detergent composition with improved anti-filming and anti-spotting properties and to a method of using the detergent composition to clean dishware, glassware, china and the like.
• the dishwashing composition contains an anti-filming agent, or an anti-filming agent and poly acrylic acid polymer or salt as anti-filming and anti-spotting agents, inorganic builder salts, chlorine bleach and bleach stable detergent.
• the detergent dishwashing composition of the present invention reduced filming and/or spotting on dishware, glassware, china and the like, particularly in hard water at low temperature.
• the invention relates to the use of a nonabrasive amount of small substantially water insoluble particles, e.g. silica, as an anti-filming agent and polyacrylic acid or salt polymer as an anti-spotting agent in powder dishwashing detergent compositions to reduce filming and/or spotting.
• a nonabrasive amount of small substantially water insoluble particles e.g. silica
• polyacrylic acid or salt polymer as an anti-spotting agent in powder dishwashing detergent compositions to reduce filming and/or spotting.
• the detergent compositions do not require an added rinse aid, are stable in storage and are readily dispersible in wash bath.
• the present invention specifically relates to powder automatic dishwashing detergent compositions having improved anti-filming and anti-spotting properties, which are readily dispersible in the washing medium to provide effective cleaning of dishware, glassware, china and the like.
• the present invention also relates to an improved powder composition and to a method of using the composition.
• the present invention is directed to a powder automatic dishwasher detergent composition having improved anti-filming and/or anti-spotting properties for cleaning of dishware, glassware, china and the like.
• the detergent composition contains as an essential ingredient a nonabrasive amount of small substantially water insoluble solid particles as an anti-filming agent.
• the compositions can additionally contain a polyacrylic acid polymer or salt as an anti-spotting agent.
• the present invention specifically relates to powder automatic dishwashing detergent powder compositions having improved anti-filming and/or anti-spotting properties for cleaning of dishware, glassware, china and the like.
• the powder compositions are dry, free flowing and readily dispersed in the wash bath.
• the commercially available formulated powder detergents frequently require a separate step of hand towel wiping and drying of the dishware, glassware, china and the like to avoid leaving undesirable traces or film.
• the use of liquid detergent compositions present other problems.
• the builder salts settle in storage and sre not readily redispersed.
• the compositions also frequently become thicker in storage and are not readily pourable.
• the automatic dishwashing detergent hereinafter also designated ADD, contain (1) sodium tripolyphosphate ( NaTPP ) to soften or tie up hard-water minerals and to emulsify and/or peptize soil; (2) sodium silicate to supply the alkalinity necessary for effective detergency and to provide protection for dishware, such as fine china and protection against machine corrosion; (3) sodium carbonate, generally considered to be optional, to enhance alkalinity; (4) a chlorine-releasing agent to aid in cleaning; (5) a surfactant and (6) a defoamer to reduce foam, thereby enhancing machine efficiency.
• NaTPP sodium tripolyphosphate
• sodium silicate to supply the alkalinity necessary for effective detergency and to provide protection for dishware, such as fine china and protection against machine corrosion
• sodium carbonate generally considered to be optional, to enhance alkalinity
• a chlorine-releasing agent to aid in cleaning
• U.S. Patent No. 3,985,668 describes abrasive scouring cleaners of gel-like consistency containing (1) suspending agent, preferably the Smectite and attapulgite types of clay; (2) abrasive, e.g. silica sand or perlite; and (3) filler comprising light density powdered polymers, expanded perlite and the like.
• suspending agent preferably the Smectite and attapulgite types of clay
• abrasive e.g. silica sand or perlite
• filler comprising light density powdered polymers, expanded perlite and the like.
• the perlite has a bouyancy and thus stabilizing effect on the composition in addition to serving as a bulking agent, thereby replacing water otherwise available for undesired supernatant layer formation due to leaking and phase destabilization.
• Optional ingredients include hypochlorite bleach, bleach stable surfactant and buffer, e.g.
• silicates, carbonates, and monophosphates can be included as further optional ingredients to supply or supplement building function not provided by the buffer, the amount of such builder not exceeding 5% of the total composition, according to the patent. Maintenance of the desired (greater than) pH 10 levels is achieved by the buffer/builder components. High pH is said to minimize decomposition of chlorine bleach and undesired interaction between surfactant and bleach. When present, NaTPP is limited to 5%, as stated. Foam killer is not disclosed.
• U.S. Patent 4,511,487 dated April 16, 1985 describes a low-foaming detergent paste for dishwashers.
• the composition is based on a mixture of finely divided hydrated sodium metasilicate, an active chlorine compound and a thickening agent which is a foliated silicate of the hectorite type. Small amount of nonionic tensides and alkali metal carbonates and/or hydroxides may be used.
• the powder detergent compositions of the present invention overcome many of the prior art problems associated with powder and liquid detergents. Because of the addition of a small effective amount of a silica anti-filming agent or silica and polyacrylic acid polymer or salt anti-spotting agent to the composition an added rinse aid is not required to obtain dry sparkling clean dishes, glasses, cups and eating utensils.
• the powder detergent composition has the additional advantages of being stable in storage and readily redispersible in the dishwashing machines.
• the powder compositions of the present invention are easily pourable, easily measured and easily put into the dishwashing machines.
• silica anti-filming agent an additional and unexpected advantage of adding the silica anti-filming agent to the detergent formulation is that the silica inhibits brown stain formation in the dishwashing machine.
• the brown stain is formed by the deposition in the dishwashing machine of iron and/or manganese oxides.
• the brown stain formation is a particularly serious problem in areas having hard water.
• the silica in the formulation acts on the iron and/or manganese in the wash water to prevent their deposition in the dishwashing machine as iron and/or manganese oxides.
• the powder detergent compositions of the present invention are stable in storage, are readily dispersed and, with the exception of the anti-film agent, are easily soluble in the dishwashing machine.
• a further object of the invention is to provide a method of washing dishware, glassware, china and the like in an automatic dishwashing machine using a powder detergent composition in which a separate rinse aid is not added or needed.
• a still further object of the invention is to provide a method of washing dishware, glassware, china and the like in an automatic washing machine using a powder detergent composition by which method the dishware, glassware, china and the like are machine dried with reduced film, and spots.
• a powder detergent composition in which is incorporated from about 0.5 to 5% of a silica anti-filming agent or silica anti-filming agent and 1 to 15% of a water soluble polyacrylic acid polymer or salt anti-spotting agent.
• the silica anti-filming agent has a particle size of about 0.1 to 10 microns.
• the water soluble polyacrylic acid or salt polymer has a molecular weight of about 1000 to 100,000.
• a dry powder automatic dishwasher detergent composition which includes, on a weight basis;
• the present invention also provides a method for cleaning dishware, glassware, china and the like in an automatic dishwashing machine with an aqueous wash bath containing an effective amount of the automatic dishwasher detergent (ADD) powder composition as described above.
• the ADD composition is a dry, free flowing powder and can be readily poured into the dispensing cup of the automatic dishwashing machine and will remain within the dispensing cup until subjected to the water spray from the dishwashing machine.
• an improved automatic dishwasher detergent composition is prepared by incorporating small amounts of a silica anti-filming agent or silica anti-filming agent and polyacrylic acid polymer or salt anti-spotting agent in a dishwasher composition.
• the present invention is based upon the discovery that substantially improved anti-filming and/or anti-spotting properties can be obtained by adding to the powder detergent composition a small effective amount of a silica anti-filming agent or silica anti-filming agent and polyacrylic acid polymer or salt anti-spotting agent.
• the anti-filming agent comprises a nonabrasive amount of small substantially water insoluble particles.
• the anti-filming agent can be a member selected from the group consisting of silica, alumina and titanium dioxide and mixtures thereof.
• the silica anti-filming agent materials that can be used are fumed or precipitated synthetic or natural silica.
• the silica may be amorphous or crystalline.
• the silica material that is used may contain up to about 0.1 to 5% alumina (A12O3), usually up to about 0.5 to 3% and more usually about 1% alumina, based on the weight of silica.
• a preferred silica material is Syloid 244 which is amorphous silica, has a particle size of about 4 microns and is provided by W.R. Grace Co.
• Another suitable silica material is Silox 15, also from W.R. Grace Co., which has a particle size of about 4 microns.
• Another preferred silica material is Huber Zeo 49 which is amorphous silica and is provided by J.M. Huber Corporation and contains about 1% alumina (Al2O3). The presence of as little as 1% Al2O3 is found to help reduce the hydrolysis and subsequent solubility of the silica in the highly alkaline automatic dishwashing detergent composition.
• the particle size of the silica material that is used is important in achieving the desired anti-filming properties.
• the silica particles that are used are finely divided and can have a particle size of about 0.10 to 10 microns, preferably 0.50 to 8 microns and more preferably about 1.0 to 5.0 microns.
• the silica particles of this size and the amount used herein are not abrasive.
• the finely divided silica material particles in the dishwashing wash act to coagulate proteinaceous particulate soils and keeps them in suspension to prevent them from depositing on the clean glass and dishware to form a film.
• alumina material that can be used as an anti-filming agent is commercially available and is insoluble in water and has the formula Al2O3. Suitable materials are available under the tradenames Alumina Oxide C, available from Degussa Company and Catapal D, available from Vista Corp. Preferred alumina materials are fumed alumina and a precipitated alumina.
• the titanium dioxide material that can be used as an anti-filming agent is insoluble in water and has the formula TiO2. Suitable materials are available under the tradenames Titanium Dioxide P25, available from Degussa Co. Preferred titanium dioxide materials are fumed titanium dioxide and precipitated titanium dioxide.
• the particle size of the alumina and titanium dioxide material that are used is important in achieving the desired anti-filming properties.
• the alumina or titanium dioxide particles that are used are finely divided and can have a particle size of about 0.01 to 10 microns, preferably 0.01 to 8 microns and more preferably about 0.020 to 4.0 microns.
• a suitable particle size is about 0.01 to 0.50 microns.
• the alumina and titanium dioxide particles of this size and in the amount used herein are not abrasive.
• the finely divided alumina or titanium dioxide material particles in the dishwashing wash act to coagulate proteinaceous particulate soils and keeps them in suspension to prevent them from depositing on the clean glass and dishware.
• the alumina and titanium dioxide anti-filming agents function in the following manner.
• the glass surface of vitreous glassware contain negative charged on their surface through the Si-O bonds. Usually the oxygen atoms carry these charges. It is postulated that these negatively charged ions will attract positively charged particles and thereby will form an "artificial soil" layer. This protective mono-layer will then repel the regular food soil and will increase the anti-redeposition property of the automatic dishwashing detergent.
• the alumina and titanium dioxide particles, respectively, will generate positively charged particles which will bond themselves to the glassware surface to form the artificial soil layer which will prevent the formation of film.
• silica, alumina or titanium dioxide anti-filming agent that can be used to achieve the desired improvement in film will depend on the hardness of the water, detergent active compound, inorganic salts and other ADD ingredients.
• the silica, alumina or titanium dioxide anti-filming agents are particularly effective in hard wash water of, for example, 300 ppm hardness or more.
• the amount of each of the silica, alumina or titanium dioxide anti-film agent that is used can be about 0.5 to 5%, preferably about 1 to 4% and more preferably about 1.5 to 3% by weight based on the weight of the entire composition.
• the silica, alumina and titanium dioxide can each be used alone or one or more of them can be used mixed together.
• the weight percent amounts mentioned above are the total for the anti-film agent ingredients used in the mixture.
• polyacrylic acid polymers and salts thereof anti-spotting agents that can be used are generally commercially available and are briefly described as follows.
• the polyacrylic acid polymers and salts thereof that can be used comprise water soluble low molecular weight polymers having the formula wherein the R1, R2 and R3 can be the same or different and can be hydrogen, C1-C4 lower-alkyl, or combinations thereof.
• the value of n is 5 to 1000, preferably, 10 to 500, and more preferably 20 to 100.
• M represents hydrogen, or an alkali metal such as sodium or potassium. The preferred substituent for M is sodium.
• the preferred R1, R2 and R3 groups are hydrogen, methyl, ethyl and propyl.
• Preferred acrylic acid monomer is one where R1 to R3 are hydrogen, e.g. acrylic acid, or where R1 and R3 are hydrogen and R2 is methyl. e.g. methyl acrylic acid monomer.
• the degree of polymerization i.e. the value of n, is generally determined by the limit compatible with the solubility of the polymer in water.
• the terninal or end groups of the polymer are not critical and can be H, OH, CH3 or a low molecular weight hydrocarbon.
• the polyacrylic acid polymers and salts thereof can have a molecular weight of 500 or 1,000 to 100,000, preferably 1,500 to 80,000 and especially preferably 2,000 to 50,000.
• Specific polyacrylic acid polymers which can be used include the Acrysol LMW acrylic acid polymers from Rohm and Haas, such as the Acrysol LMW-45N, a neutralized sodium salt, which has a molecular weight of about 4,500 and Acrysol LMW-20NX, a neutralized sodium salt, which has a molecular weight of about 2,000.
• polyacrylic acid polymers or salts thereof that can be used are: Alcosperse 149, molecular weight 2000, Alcosperse 123, molecular weight 4500, Alcosperse 107, molecular weight 3000, Alcosperse 124, molecular weight 2000, and Alcosperse 602N molecular weight 4500, all of which are available from Alco Chemical Corp.
• the low molecular weight acrylic acid polymers can, for example, have a molecular weight of about 1,000 to 10,000.
• Another polyacrylic acid polymer that can be used is Alcosperse 110 (from Alco) which is a sodium salt of an organic polycarboxylate and which has a molecular weight of about 100,000.
• polyacrylic acid polymer or salt that can be used to achieve the desired improvement in anti-filming and anti-spotting properties will depend on the hardness of the water, detergent active compound, inorganic salts and other ADD ingredients.
• the polyacrylic acid or salt anti-spotting agent is particularly effective in reducing spotting in hard water of, for example, 300 ppm hardness or more.
• the amounts of the polyacrylic acid polymer or salt anti-spotting agent that can be used are in the range of from about 1.0 to 15%, preferably from about 2.0 to 12%, especially preferably about 4 to 10%.
• ADD effectiveness is directly related to (a) available chlorine levels; (b) alkalinity; (c) solubility in washing medium; and (d) foam inhibition. It is preferred herein that the pH of the ADD composition be at least about 9.5, more preferably from about 10.5 to 13.5 and most preferably at least about 11.5.
• the amount of alkali metal silicate added and the amount of alkali metal TPP added can be used to obtain the desired alkalinity.
• the sodium carbonate can be added to act as a buffer to maintain the desired pH level in the wash bath.
• the sodium carbonate can be added in an amount of 0 to 30 wt.%, preferably 5 to 25 wt.% and typically about 8 to 20 wt.% of the detergent composition.
• the sodium carbonate can be added for example in an amount of 15 to 20 wt.%.
• compositions of the present invention can contain inorganic builder salts such as NaTPP or organic builder salts such as the alkali metal salts of citric and tartaric acid.
• a preferred solid builder salt is an alkali metal polyphosphate such as sodium tripolyphosphate ("TPP").
• TPP sodium tripolyphosphate
• Suitable other builder salts are alkali metal borates, phosphates and bicarbonates.
• Such builders are sodium tetraborate, sodium pyrophosphate, potassium pyrophosphate, sodium bicarbonate, sodium hexametaphosphate, sodium sesquicarbonate, sodium mono and diorthophosphate and potassium bicarbonate.
• the NaTPP may be employed in the ADD composition in a range of 20 to 70%, preferably about 20 to 60 wt.%, and more preferably about 25 to 45 wt.%, for example 20 to 40%.
• the NaTPP may be anhydrous or hydrated, including the stable hexahydrate with a degree of hydration of 6 corresponding to about 18% by weight of water or more.
• compositions of this invention are generally highly concentrated, and, therefore, may be used at relatively low dosages, it is desirable to supplement any phosphate builder (such as sodium tripolyphosphate) with an auxiliary builder such as an alkali metal polycarboxylic acid.
• a phosphate builder such as sodium tripolyphosphate
• an auxiliary builder such as an alkali metal polycarboxylic acid.
• the NaTPP may be replaced in whole or in part by the alkali metal polycarboxylic acid.
• Suitable alkali metal polycarboxylic acids are alkali metal salts of citric and tartaric acid, e.g. monosodium and disodium citrate (anhydrous). The sodium salts of citric and tartaric acids are preferred.
• Alkali metal sulfates preferably sodium sulfate is added as an anhydrous filler material.
• the sodium sulfate can be added in an amount of 0-30%, preferably 5 to 25%, and more preferably 10 to 20% by weight of the composition.
• Foam inhibition is important to increase dishwasher machine efficiency and minimize destabilizing effects which might occur due to the presence of excess foam within the washer during use. Foam may be sufficiently reduced by suitable selection of the type and/or amount of detergent active material, the main foam-producing component. The degree of foam is also somewhat dependent on the hardness of the wash water in the machine whereby suitable adjustment of the proportions of NaTPP which has a water softening effect may aid in providing the desired degree of foam inhibition. However, it is generally preferred to include a chlorine bleach stable foam depressant or inhibitor.
• alkyl phosphonic acid esters of the formula available for example, from BASF-Wyandotte (PCUK-PAE), and especially the alkyl acid phosphate esters of the formula available, for example, from Hooker (SAP) and Knapsack (LPKN-158), in which one or both R groups in each type of ester may represent independently a C12 ⁇ 20 alkyl group.
• SAP Hooker
• LNKN-158 Knapsack
• Mixtures of the two types, or any other chlorine bleach stable types, or mixtures of mono- and di-esters of the same type may be employed.
• a mixture of mono- and di-C16 - 18 alkyl acid phosphate esters such as monostearyl/distearyl acid phosphates 1.2/1 (Knapsack).
• proportions of 0.01 to 6 wt.%, preferably 0.1 to 5 wt.%, especially about 0.1 to 0.5 wt.%, of foam depressant in the composition is typical.
• the weight ratio of detergent active component to foam depressant generally ranging from about 15:1 to 2:1 and preferably about 10:1 to 4:1.
• Other defoamers which may be used include, for example, the known silicones.
• any chlorine bleach compound may be employed in the compositions of this invention, such as sodium hypochlorite and calcium hypochiorite, sodium dichloro-isocyanurate, dichloro-dimethyl hydantoin, and chlorinated TSP, sodium dichloro-isocyanurate is preferred.
• the composition should contain sufficient chlorine bleach compound to provide about 0.5 to 8.0% by weight of available chlorine, as determined, for example, by acidification of the composition with surfuric acid.
• a solution containing about 0.9 to 14.3% by weight of sodium dichloroisocyanurate contains or provides roughly the same percentage of available chlorine.
• the composition can preferably contain about 1 to 3% available chlorine.
• a solution containing about 1.8 to 5.4% by weight sodium dichloroisocyanurate dihydrate contains about 1 to 3% by weight of available chlorine and is especially preferred.
• the sodium silicate which provides alkalinity and protection of hard surfaces, such as fine china, is employed in an amount ranging from about 5 to 40 wt.%, preferably about 8 to 35 wt.%, and more preferably about 10 to 25 wt.%, in the composition.
• the composition can contain 8 to 25% sodium silicate.
• the sodium silicate also protects the washing machine from corrosion.
• the sodium silicate can have a Na2O:SiO2 ratio of 1.6/1 to 1/3.2.
• the sodium silicate can be added in the form of a dry powder or an aqueous solution, preferably having an Na2O:SiO2 ratio of from 1/1 to 1/2.8, for example, 1/2.4. Potassium silicates of the same ratios can also be used.
• the preferred alkali metal silicates are sodium disilicate and sodium metasilicate.
• compositions especially calcium hypochlorite and foam depressant can be added in the form of dry powders or aqueous dispersions or solutions.
• the detergent active materials used in the present invention are selected to be stable in the presence of chlorine bleach.
• the organic nonionic and anionic detergents can be used.
• liquid nonionic surfactant detergents that can be used in the practice of the present are preferably the low foam nonionic surfactants.
• Useful nonionics are represented by the low foam Plurafac series from BASF Chemical Company which are the reaction product of a higher linear alcohol and a mixture of ethylene and propylene oxides, containing a mixed chain of ethylene oxide and propylene oxide, terminated by a hydroxyl group. Examples include a C13-C15 fatty alcohol condensed with 6 moles ethylene oxide and 3 moles propylene oxide, a C13-C15 fatty alcohol condensed with 7 moles propylene oxide and 4 moles ethylene oxide and a C13-C15 fatty alcohol condensed with 5 moles propylene oxide and 10 moles ethylene oxide.
• Neodol 25-7 and Neodol 25-6.5 are made by Shell Chemical Company, inc.
• the former is a condensation product of a mixture of higher fatty alcohols averaging about 12 to 15 carbon atoms, with about 7 mols of ethylene oxide and the latter is a corresponding mixture wherein the carbon atom content of the higher fatty alcohol is 12 to 13 and the number of ethylene oxide groups present averages about 6.5.
• the higher alcohols are primary alkanols.
• Other examples of such detergents include Tergitol 15-S-7 and Tergitol 15-S-9 (registered trademarks), both of which are linear secondary alcohol ethoxylates made by Union Carbide Corp.
• the former is mixed ethoxylation product of 11 to 15 carbon atoms linear secondary alkanol with seven mols of ethylene oxide and the latter is a similar product but with nine mols of ethylene oxide being reacted.
• a preferred nonionic surfactant is available from Union Carbide Corporation under the trademark Tergitol MDS-42.
• This nonionic surfactant is a C12-C14 linear alcohol containing 55% by weight random distributed oxyalkyl groups of which 42% are ethoxy and 58% propoxy groups.
• Nonionic surfactant that can be used in accordance with the present invention has the following formula RO-O-(PO) x -(EO/PO)H
• R is an alkyl group having 8 carbon atoms
• PO is a propylene oxide polymer attached directly to the oxygen of the alkyl group
• x is 8 to 9
• EO/PO represents a copolymer of ethylene oxide and propylene oxide in which the ethylene oxide and propylene oxide are randomly mixed.
• the molar ratio of EO/PO is about 2:1 to 5:1, e.g. about 3:1.
• the total number of EO and PO groups in the copolymer are such that the number of EO and PO groups are 5 to 8 and the cloud point of the nonionic surfactant is about 20 to 30°C.
• Nonionic surfactants are the Poly-Tergent S-LF surfactants available from Olin Corporation. These surfactants are low foaming, biodegradable linear fatty alcohols. Surfactants of this type are available under the tradenames Poly-Tergent S-LF 18, Poly-Tergent S-305-LF, Poly-Tergent S-405-LF and Poly-Tergent CS-1.
• the detergent active materials used herein must be stable in the presence of chlorine bleach, especially hypochlorite bleach.
• anionic surfactants can also be used.
• anionic surfactants that can be used are the linear or branched alkali metal mono- and/or di-(C8 - 14) alkyl diphenyl oxide mono and/or disulphonates, commercially available for example as DOWFAX (Registered Trademark) 3B-2 and DOWFAX 2A-1.
• Suitable surfactants include the primary alkyl sulphates, alkyl sulphonates, alkylaryl-sulphates and sec. alkyl sulphates.
• Examples include sodium C10 ⁇ 18 alkyl sulphates such as sodium dodecyl sulphate and sodium tallow alcohol sulphate; sodium C10 ⁇ 18 alkane sulphonates such as sodium hexadecyl-1-sulphonate and sodium C12 - 18 alkylbenzene sulphonates such as sodium dodecylbenzene sulphonates.
• the corresponding potassium salts may also be employed.
• the surfactants are used in amounts of 0.1 to 6%, preferably 0.5 to 6.0%, and more preferably about 1.0 to 5.0%, for example 2 to 4%.
• compositions may be included in small amounts, generally less than' about 4 wt.%, such as perfume, hydrotropic agents such as the sodium benzene, toluene, xylene and cumene sulphonates, preservatives, dyestuffs and pigments and the like, all of course being stable to chlorine bleach compound and high alkalinity.
• hydrotropic agents such as the sodium benzene, toluene, xylene and cumene sulphonates
• preservatives dyestuffs and pigments and the like
• dyestuffs and pigments and the like all of course being stable to chlorine bleach compound and high alkalinity.
• Especially preferred for coloring are the chlorinated phthalocyanines and polysulphides of aluminosilicate which provide, respectively, pleasing green and blue tints.
• the powder ADD compositions of this invention are readily employed in known manner for washing dishes, glasses, cups, eating utensils and the like in an automatic dishwasher, provided with a suitable detergent dispenser, in an aqueous wash bath containing an effective amount of the composition.
• a powder automatic dishwashing detergent composition is formulated using the below named ingredients.
• the powder detergent composition can be prepared as a regular strength composition containing sodium carbonate and sodium sulfate or as a concentrate composition in which all or a portion of each of the sodium carbonate and sodium sulfate have been omitted.
• the dishwasher detergent compositions of the present invention can contain conventional dishwashing detergent composition additives.
• the formulations can be prepared with commercially available powder builders, chlorine bleach source compounds and surfactant compounds.
• the formulations can be prepared using the conventional dry blending and agglomeration procedures used for the preparation of dry powder detergent compositions.
• nonionic surfactant is thoroughly mixed with STPP by overspraying it at 120°F in a twin-shelled mixer.
• the STPP beads containing absorbed surfactant are then conditioned, that is allowed to sit overnight.
• the loaded STPP material is then successively mixed with anti-filming agent or anti-filming agent and polyacrylate acid polymer or salt, sodium carbonate, sodium sulfate and sodium silicate granules. Finally sodium dichloroisocyanurate is added and blended with the rest and mixed thoroughly in the mixer.
• Another method for preparing the automatic dishwasher detergent powder compositions of the present invention is the agglomeration procedure.
• the agglomeration procedure provides better bleach stability by coating the nonionic surfactant with the sodium silicate which separates the nonionic surfactant from the reactive bleach.
• the STPP builder salt in the form of powder granules is introduced into a rotary drum and sprayed with the nonionic liquid surfactant at a temperature of about 1200F.
• the STPP granules during the spraying operation are maintained at a temperature of about 1000F.
• the STPP granules loaded with the nonionic surfactant are dried overnight.
• the loaded dried STPP is mixed with the remaining STPP, anti-filming agent or anti-filming agent and polyacrylic acid or salt, sodium carbonate and sodium sulfate in an agglomerator.
• An aqueous solution of sodium silicate is then sprayed on the mixed powders in the agglomerator.
• the mixed agglomerated powders are then added to a granulator in order to sieve out the desired particle size of the agglomerate. From the granulator the powder composition is fed to a fluid bed drying unit to dry the powder. Finally, sodium dichloroisocyanurate is post added and blended with agglomerated granules to complete the process.
• One or more ingredients can be omitted or additional ingredients such as perfumes and anti-foam agents can be added to the composition.
• the order of adding the solid powder ingredients to the agglomerator is not particularly critical as long as good mixing is achieved.
• dry powder compositions as used herein is intended to include free flowing powder compositions containing 0-15% moisture, typically 2-14% and more typically 4-12% moisture,. for example 8-10%.
• the moisture can be present in the form of hydrated compounds, for example, sodium tripolyphosphate hexahydrate hydrated sodium carbonate, hydrated sodium sulfate and dichloroisocyanurate dihydrate and/or in the form of unbound water. It is preferred that the composition contaln less than about 10% moisture as unbound water.
• automatic dishwasher powder detergent compositions are formulated using the below named ingredients in the amounts indicated.
• the two above formulations (A) and (B) are tested and compared for film and spot formation.
• the formulations are tested in a Kenmore automatic dishwasher using the procedure described in ASTMD 3566-79, except that only four cleaning cycles are used.
• the filming and spotting are evaluated according to the following scales:
• compositions are tested cleaning glass tumblers.
• the ASTM Method D3556-73 for the deposition on glassware during mechanical dishwashing is used to evaluate the buildup of spots and film on glassware. 50 grams of the invention powder detergent composition (A) and 50 grams of the commercial powder detergent composition (B) detergent are used in each test. All testing reported is done in Kenmore Model 587.1548580 and/or model 587.1546580 Automatic Dishwasher. The water wash temperature is 1200F and the water has 300 ppm hardness.
• the commercial powder gives more film than the invention powder ADD compositions. There is no difference in the spot scores.
• powder automatic dishwasher detergent compositions are formulated using the below named ingredients in the amounts indicated.
• the first formulation (A) contains 2.24 wt.% silica anti-filming agent
• the second formulation (B) contains, 2.74 wt.% silica anti-filming agent and 8 wt.% sodium polyacrylate
• the third formulation (C) contains no silica and no sodium polyacrylate.
• a dose size of 50 grams of each of formulations (A), (B) and (C) are used to evaluate the efficacy of the anti-filming and anti-spotting agents.
• the invention formulations (A) and (B) are evaluated with regard to film and spot against the commercial formulation (C) under 300 ppm water hardness in 4 cycle ASTM runs at 120°F water wash temperature in each test.
• the invention formulation (A) performs better than commercial formulation (C) with regard to film formation.
• the inventive formulation (B) performs better than invention formulation (A) with regard to spot formation and better than commercial formulation (C) with regard to spot and film formation.
• inventive formulations (A) and (B) both performed substantially better against the commercial formulation (C) with regard to spot formation.
• the invention formulation (A) containing silica did not perform quite as well as invention formulation (B) containing silica and sodium polyacrylate with regard to spot formation.
• the tumblers after a normal wash cycle are removed from the dishwasher and are found to be free of spots and to contain only a slight amount of film.
• Automatic dishwashing powder detergent compositions are formulated from the following ingredients in the amounts specified.
• the ingredients are added in the order listed and mixed until a homogeneous powder mixture is obtained.
• the formulations are tested by washing glassware at 1200F in hard water (300 ppm hardness).
• the two formulations are tested and compared.
• the formulations are tested in a Kenmore automatic dishwasher to clean glass tumblers using the procedure described in ASTMD 3566-79, except that only four cleaning cycles are used.
• the spotting and filming are evaluated as in Example 2 and the results obtained in the fourth cycle are reported in the below Table.
• the two formulations perform about the same on spot.
• the invention formulation performs substantially better on film.
• Example 4 is repeated with the difference that 2.00 wt.% titanium dioxide is substituted for the alumina anti-filming agent.
• the formulations are tested by washing glassware at 130°F in hard water (300 ppm hardness) as before.
• the results obtained in the fourth cycle are reported in the below Table.
• the two formulations perform about the same on spot.
• the invention formulation performs better on film.
• the automatic dishwasher powder detergent compositions of the present invention provide improved film and/or improved spot properties on glassware and dishware.

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• 1990
  • 1990-11-30 EP EP19900403421 patent/EP0430818A3/en not_active Withdrawn
  • 1990-11-30 CA CA 2031289 patent/CA2031289A1/en not_active Abandoned

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