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
  • C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
  • C11D17/06—Powder; Flakes; Free-flowing mixtures; Sheets
  • C11D17/065—High-density particulate detergent compositions
• • 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
  • C11D3/124—Silicon containing, e.g. silica, silex, quartz or glass beads
  • C11D3/1246—Silicates, e.g. diatomaceous earth
  • C11D3/1253—Layer silicates, e.g. talcum, kaolin, clay, bentonite, smectite, montmorillonite, hectorite or attapulgite
  • C11D3/1273—Crystalline layered silicates of type NaMeSixO2x+1YH2O
• • 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
  • C11D3/1246—Silicates, e.g. diatomaceous earth
  • C11D3/128—Aluminium silicates, e.g. zeolites

Definitions

• the present invention relates to a high-density detergent composition.
• a high-density powdered detergent composition being excellent in detergency and solubility at low temperature and exhibiting excellent biodegradability.
• a detergent composition for clothes is basically composed of a surfactant which solubilizes soil, separates it from fibers, and dissolves or disperses it in a washing solution, an alkaline substance which accelerates the decomposition or solubilization of soil, a high-molecular compound which suspends soil in a washing solution, a sequestering agent which removes substances lowering the power of surfactants, for example, calcium or magnesium ions from a washing solution, and so on.
• builders for detergents generally refer to substances which do not exhibit detergency per se but can enhance the detergency of a surfactant when used together with the surfactant.
• the above-mentioned sequestering agent serves to make a surfactant exhibit its performance more effectively, thus being one of the extremely important builders for detergents.
• Phosphate salts such as sodium tripolyphosphate were formerly added to detergent compositions for clothes as the sequestering agent.
• phosphate salts are believed to be one of the factors causing the eutrophication of lakes, marshes and so on.
• the use of the phosphate builders has been self-restrained, while the development of a detergent not containing any phosphate builder has been continued. The development of such a non-phosphorus detergent has been continued from about 1980.
• zeolite a crystalline sodium aluminosilicate having a specific structure (which is called "zeolite” in the detergent industry) is currently used as the main component of the sequestering agent, because it is free from the above problem unlike phosphate builders and has recently been stabilized in the cost.
• a detergent composition for clothes has changed in the form from the late 1980s, so that a so-called compact detergent which has a high bulk density and is lowered in the volume of the composition used per washing run is now widely used.
• the particles constituting such a compact detergent are more highly compacted than those constituting the detergent of the prior art, thus being problematic in solubility. For example, washing with water having a temperature of as low as about 5 °C is not unusual in winter, and the standard time of ordinary home washing (exclusive of rinsing and dehydration) is as very short as about 10 minutes.
• zeolite which is currently used as the main builder is insoluble in water per se, and has the problem that when a powdered detergent containing zeolite comes into contact with water, it forms a difficultly soluble and highly viscous detergent paste through the interaction of the detergent with surfactants or inorganic salts.
• zeolite sequesters components enhancing the hardness of water lies essentially in ion exchange, and the rate of the ion exchange depends on the rate of diffusion of the ions in zeolite.
• zeolite has another problem that it takes a remarkably long time to develop the ion exchange power.
• Zeolite is most widely used as a representative non-phosphorus builder for detergents. As described above, however, zeolite often fails in exhibiting its performance under the conditions of low temperature and short washing time. Such insufficiency of the performance of zeolite as the builder for detergents is generally covered by a polymeric dispersant consisting of a polycarboxylic acid. Such polycarboxylic acids are also a kind of ion exchangers and are effective in sequestering polyvalent cations. However, the polycarboxylic acids are liable to thicken the above detergent paste, and therefor the use of the acids has a problem of lowering the solubility of a zeolite-containing detergent.
• the present invention aims at providing a high-density powdered detergent composition exhibiting excellent solubility and detergency even under the condition of low water temperature.
• the inventors of the present invention have made extensive studies for attaining the above aim. As a result of the studies, they have found that a high-density powdered detergent composition comprising an aluminosilicate and a specific aspartic acid diacetic acid salt serving as an organic builder is excellent in solubility and detergency even at low temperature.
• the present invention has been accomplished on the basis of this finding.
• the present invention provides a high-density powdered detergent composition which has a bulk density of 0.6 to 1.2 g/ml and which comprises 0.5 to 30 % by weight of (a) an aspartic acid diacetic acid salt represented by the following formula (I), 20 to 50 % by weight of (b) an anionic surfactant, 1 to 30 % by weight of (d) an aluminosilicate and 0.5 to 25 parts by weight (per 100 parts of the component (b)) of (c) a nonionic surfactant having an HLB (Hydrophile Lypophile Balance) value of 10.5 to 15.0, each percentage being based on the total weight of the composition: wherein R is H or OH; and M 1 , M 2 , M 3 and M 4 are each H, Na, K or NH 4 .
• HLB Hydrophile Balance
• the present invention relates to a high-density powdered detergent composition which comprises
• the organic builder to be used in the present invention is an aspartic acid diacetic acid salt represented by the formula (I).
• M 1 , M 2 , M 3 and M 4 are each generally hydrogen ion, sodium ion or potassium ion.
• the organic builder (a) is contained in the composition in an amount of 0.5 to 30 % by weight, preferably 2 to 30 % by weight, still preferably 2 to 20 % by weight.
• anionic surfactant examples include alkylbenzenesulfonic acid salts wherein the alkyl has 8 to 18 carbon atoms, salts of alkanesulfonic acids (SAS), salts of ⁇ -olefinsulfonic acids, salts of sulfates of primary and secondary higher alcohols, salts of sulfates of polyoxyethylene alkyl ethers, ⁇ -sulfofatty acid salts and C 10 -C 20 higher fatty acid salts.
• SAS alkanesulfonic acids
• anionic surfactants may be used each alone or as a mixture of two or more of them.
• the component (b) is contained in the composition in an amount of 20 to 50 % by weight, preferably 20 to 40 % by weight. When the amount of the component (b) lies within this range, high detergency can be attained.
• HLB value used in this description refers to one calculated by Griffin's method.
• nonionic surfactants having HLB values falling within the above range include products of the adduction reaction of C 10 -C 18 linear and branched, primary and secondary alcohols with alkylene oxides such as ethylene oxide and propylene oxide in such ratios as to give HLB values falling within the above range (i.e., polyoxyalkylene alkyl ethers).
• the nonionic surfactant to be used in the present invention also includes polyoxyalkylene alkylphenyl ethers prepared in similar manners to that described above, fatty acid esters of polyoxyalkylene sorbitan, fatty acid esters of polyoxyalkylene glycol, fatty acid esters of polyoxyalkylene sorbitol, alkanolamides of polyoxyalkylene higher fatty acids, and esters of polyoxyalkylene higher fatty acids with polyhydric alcohols, whose HLB values fall within the above range.
• the component (c) is used in an amount of 0.5 to 25 parts by weight, preferably 2.0 to 25 parts by weight, still preferably 2.0 to 15 parts by weight per 100 parts by weight of the component (b).
• the components (b) and (c) are used at such a ratio, not only the ionic properties due to the component (b) are retained, i.e., excellent detergency against inorganic particles and so on is exhibited, but also a contribution of the nonionic surfactant toward the detergency is found.
• the aluminosilicate to be used in the present invention as the component (d) may be any of amorphous and crystalline ones.
• the amorphous aluminosilicate be one containing silicon in an amount of 30 % by weight or above, still preferably 40 % by weight or above in terms of SiO 2 .
• the use of such an amorphous aluminosilicate as to give a 5 % dispersion (a dispersion of 5 g of a sample in 100 ml of water free from carbonic acid) having a pH of 9 or above brings about a detergent composition which exhibits excellent solubility even after the storage under high-humidity conditions.
• such an amorphous aluminosilicate is effective in protecting the detergent composition from the deterioration of solubility caused by storage under high-humidity conditions.
• the term "pH" used above with respect to a 5 % amorphous aluminosilicate dispersion refers to a value as determined according to JIS K6220.
• amorphous aluminosilicate to be used in the present invention examples include those represented by the following formula (i): a(M 2 O) ⁇ Al 2 O 3 ⁇ b(SiO 2 ) ⁇ c(H 2 O) wherein M is alkali metal; and a, b and c represent the molar proportions of the constituent components respectively.
• a is a number of 0.7 to 2.0
• b is a number of 0.8 or above but below 4
• c is an arbitrary positive number.
• amorphous aluminosilicates exhibit high oil absorption and high cation exchange capacity.
• amorphous aluminosilicates those represented by the following formula (ii) are particularly preferable: Na 2 O ⁇ Al 2 O 3 ⁇ b(SiO 2 ) ⁇ c(H 2 O) wherein b is a number of 1.8 to 3.2; and c is a number of 1 to 6.
• Such amorphous aluminosilicates can be prepared by referring to, e.g., the process disclosed in JP-A 6-179899 and EP-A 593014 corresponding thereto.
• crystalline aluminosilicate is generally called "zeolite", and is represented by the following formula (iii): a'(M 2 O) ⁇ Al 2 O 3 ⁇ b'(SiO 2 ) ⁇ w(H 2 O) wherein M is alkali metal; and a', b' and w represent the molar proportions of the constituent components respectively, with a', b' and w being generally a number of 0.7 to 1.5, a number of 0.8 or above but below 6, and an arbitrary positive number, respectively.
• crystalline aluminosilicates those represented by the following formula (iv) are particularly preferable: Na 2 O ⁇ Al 2 O 3 ⁇ n(SiO 2 ) ⁇ w(H 2 O) wherein n is a number of 1.8 to 3.0; and w is a number of 1 to 6.
• the crystalline aluminosilicate (zeolite) to be used in the present invention is desirably a synthetic zeolite having a mean primary particle diameter of 0.1 to 10 ⁇ m, for example, zeolite A, X or P.
• the zeolite may be added in the form of a powder and/or a dry agglomerate prepared by drying a zeolite slurry.
• the aluminosilicate (d) is contained in the composition in an amount of 1 to 30 % by weight, preferably 5 to 25 % by weight.
• the weight ratio of the component (a) to the component (d) lie between 1 : 5 and 5 : 1.
• the high-density powdered detergent composition of the present invention comprises the above components (a) to (d) as the essential components, it may further contain the following components.
• the high-density powdered detergent composition of the present invention contains a crystalline silicate.
• the crystalline silicate to be used in the present invention is preferably one essentially consisting of silicon dioxide (Si 2 O) and an alkali metal oxide (i.e., an alkali metal silicate), still preferably an alkali metal silicate having an SiO 2 to M 2 O ratio (wherein M is alkali metal) of 0.5 to 2.6.
• Examples of the crystalline silicate to be favorably used in the present invention include those having the following compositions (II) and (III): x(M 2 O) ⁇ y(SiO 2 ) ⁇ z(Me m O n ) ⁇ w(H 2 O) wherein M is a Group Ia element of the periodic table: Me is at least one element selected from among Group IIa, IIb, IIIa, IVa and VIII elements of the periodic table; y/x is a number of 0.5 to 2.6, preferably 1.5 to 2.2; z/x is a number of 0.01 to 1.0, preferably 0.02 to 0.9, still preferably 0.02 to 0.5; w is a number of 0 to 20; and n/m is a number of 0.5 to 2.0, and M 2 O ⁇ x'(SiO 2 ) ⁇ y'(H 2 O) wherein M is alkali metal; x' is a number of 1.5 to 2.6; and y' is a number of 0 to 20.
• the crystalline silicate represented by the formula (II) exhibits a pH of 11 or above in the state of a 0.1 % by weight aqueous dispersion. That is, it exhibits a high alkalinizing power. Further, the crystalline silicate exhibits a particularly high buffer capacity in the alkaline (basic) region and its buffer capacity is higher than that of sodium carbonate or potassium carbonate.
• the crystalline silicate represented by the formula (II) has an ion exchange capacity of at least 100 CaCO 3 mg/g, preferably 200 to 600 CaCO 3 mg/g, and therefore serves as one of the substances capable of capturing ions in the present invention.
• the crystalline silicate represented by the formula (II) exhibits both a high alkalinizing power and a high buffer capacity in the alkaline (basic) range, and further has a high ion exchange capacity.
• the crystalline silicate represented by the formula (II) have a mean particle diameter of 0.1 to 100 ⁇ m, still preferably 1 to 60 ⁇ m.
• the mean particle diameter exceeds 100 ⁇ m, the development of the ion exchange power of the silicate will be so slow as to bring about a lowering in the detergency, while when it is less than 0.1 ⁇ m, the resulting silicate will exhibit high absorptivity for moisture and CO 2 owing to its enhanced specific surface area to result in remarkably deteriorated quality.
• mean particle diameter used in this description refers to a median diameter of particle size distribution.
• the crystalline silicate having such a mean particle diameter can be produced by pulverizing crystalline silicate particles of somewhat large sizes by the use of a vibration mill, a hammer mill, a bowl mill, a roller mill or other pulverizer.
• the crystalline silicates represented by the formula (III) those wherein x' is 1.7 to 2.2 and y' is 0 are preferable. Further, those having a cation exchange capacity of 100 to 400 CaCO 3 mg/g are usable in the present invention.
• the crystalline silicate represented by the formula (III) serves as one of the substances capable of capturing ions.
• the crystalline silicate represented by the formula (III) exhibits both a high alkalinizing power and a high buffer capacity in the alkaline (basic) range, and further has a high ion exchange capacity.
• the crystalline silicate represented by the formula (III) can generally be prepared by firing amorphous glassy sodium silicate at 200 to 1000 °C to crystallize it, though the production processes therefor are disclosed in JP-A 60-227895 and US 4664839 corresponding thereto. Details of the production thereof are described also in, for example, Phys. Chem. Glasses. 7 , 127-138 (1966), Z. Kristallogr., 129 , p.p.396-404 (1969) and so on. Further, the crystalline silicate represented by the formula (III) is commercially available, e.g., under the trade name of "Na-SKS-6" (composition: ⁇ -Na 2 Si 2 O 5 ) from Hoechst Ltd. as powder or granule.
• the crystalline silicate represented by the formula (III) as well as the one represented by the formula (II) have a mean particle diameter of 0.1 to 100 ⁇ m, still preferably 1 to 60 ⁇ m.
• the crystalline silicates represented by the formula (II) and those represented by the formula (III) may be used each alone or as a mixture of two or more of them. Further, it is preferable that the silicate(s) account for 30 to 100 % by weight, still preferably 70 to 100 % by weight of the alkaline substances contained in the composition.
• the crystalline silicate be contained in the composition in an amount of 1 to 40 % by weight, still preferably 5 to 35 % by weight.
• the amount exceeds 40 % by weight, the resulting detergent composition will be poor in the physical properties as powder and often cause caking owing to its high hygroscopicity, resulting in difficult handling.
• the high-density powdered detergent composition contain a polycarboxylate having an average molecular weight of hundreds to a hundred thousand, for example, a random copolymer comprising at least one monomer selected from the group consisting of maleic acid, maleic anhydride and salts of maleic acid with sodium, potassium and ammonium and at least one monomer copolymerizable therewith (such as C 1 -C 8 olefin, acrylic acid, methacrylic acid, itaconic acid or methallylsulfonic acid), or a homopolymer represented by the following formula (V): (P) 1 wherein P is a constituent unit of a homopolymer resulting from a homopoly
• the constituent unit of the homopolymer is one resulting from acrylic acid, methacrylic acid, maleic acid or the like.
• one or more members selected from among the above random copolymers and the homopolymers of the formula (V) be used in a total amount (or in an amount, when only one of them is used) of 1 to 8 % by weight, still preferably 2 to 6 % by weight based on the total amount of the detergent composition containing the same.
• these polycarboxylates salts of acrylic acid/maleic acid copolymers or polyacrylic acid with Na, K and/or NH 4 are particularly excellent.
• the average molecular weight thereof is preferably 1000 to 100000, still preferably 1000 to 80000.
• the high-density powdered detergent composition of the present invention can contain also the following inorganic or organic builders.
• the high-density powdered detergent composition of the present invention may further contain other conventional components for detergents at need, and such components include bleaching agents, bleaching activators, enzymes, enzyme stabilizers, bluing agents, anticaking agents, antioxidants, fluorescent dyes and perfumes.
• bleaching agents examples include sodium percarbonate, sodium perborate (with its monohydrate being preferable) and sodium sulfate-hydrogen peroxide adduct, among which sodium percarbonate is particularly preferable.
• bleaching activators examples include tetraacetylethylenediamine, acetoxybenzenesulfonic acid salts, organic peroxy acid precursors described in JP-A 59-22999 and US 4412934 corresponding thereto, JP-A 63-258447 and US 4751015 corresponding thereto, and JP-A 6-316700, and metal catalysts wherein transition metals are stabilized with sequestering agents.
• the enzyme to be optionally used in the present invention (which essentially exhibits enzymatic activity in the washing step) is preferably protease, esterase, lipase, carbohydrase, nuclease or pectinase.
• protease examples include pepsin, trypsin, chymotrypsin, collagenase, keratinase, elastase, subtilisin, BPN, papain, bromelin, carboxypeptidases A and B, aminopeptidase and aspergillopeptidases A and B, which are commercially available under the trade names of "Sabinase” and “Alkarase” (from Novo Industri), "API21” (from Showa Denko, K.K.) and Maxacal (from Gist-Brocades); and proteases K-14 and K-16 described in JP-A 5-25492 and US 5312561 corresponding thereto.
• esterase examples include gastric lipase, pancreatic lipase, plant lipase, phospholipase, choline esterase and phosphatase.
• the lipase may be a commercially available one such as "Lipolase” (a product of Novo Industri).
• carbohydrase examples include cellulase, maltase, saccharase, amylase, lysozyme, ⁇ -glycosidase and ⁇ -glycosidase.
• the cellulase may be "Celluzyme” (a product of Novo Industri) or a cellulase described in claim 4 of JP-A 63-264699 and US 4822516 and 4978470 corresponding thereto, while the amylase may be "Termamyl” (a product of Novo Industri) or the like.
• the enzyme stabilizers include reducing agents (such as sodium sulfite and sodium hydrogensulfite), calcium salts, magnesium salts, polyols, boron compounds and so on.
• bluing agents may also be added to the detergent composition at need.
• bluing agents whose chemical structures are described in JP-B 49-8005, 49-26286 and 53-45808 are preferably used.
• anticaking agents examples include p-toluenesulfonic acid salts, xylenesulfonic acid salts, acetic acid salts, sulfosuccinic acid salts, talc, finely powdered silica, clay and magnesium oxide.
• finely divided silica and so on porous ones are usable also as carriers for nonionic surfactants.
• clay specifically, smectite clay is effective also as softener.
• antioxidants examples include t-butylhydroxytoluene, 4,4'-butylidenebis(6-t-butyl-3-methylphenol), 2,2'-butylidenebis(6-t-butyl-4-methylphenol), monostyrenated cresol, distyrenated cresol, monostyrenated phenol, distyrenated phenol and 1,1'-bis(4-hydroxyphenyl)cyclohexane.
• the detergent composition may contain a fluorescent dye in an amount exceeding 0 % by weight but up to 1 % by weight, the fluorescent dye being at least one member selected from the group consisting of 4,4'-bis(2-sulfostyryl)biphenyl salts, 4,4'-bis(4-chloro-3-sulfostyryl)biphenyl salts, 2-(styrylphenyl)naphthothiazole derivatives, 4,4'-bis(triazol-2-yl)stilbene derivatives and bis(triazinylamino)stilbenedisulfonic acid derivatives.
• a fluorescent dye in an amount exceeding 0 % by weight but up to 1 % by weight, the fluorescent dye being at least one member selected from the group consisting of 4,4'-bis(2-sulfostyryl)biphenyl salts, 4,4'-bis(4-chloro-3-sulfostyryl)biphenyl salts, 2-(styrylphenyl
• perfumes examples include conventional ones for detergents as described in JP-A 63-101496.
• the high-density powdered detergent composition of the present invention takes a powdery or granular form.
• the process for producing the composition is not particularly limited, but may be any known one.
• the bulk density of the composition can be enhanced by a process of spraying a nonionic surfactant on spray-dried particles, a process of making a powdery component containing an oil-absorbing carrier occlude a nonionic surfactant, or by referring to the processes described in JP-A 61-69897, 61-69899 and 61-69900, JP-A 2-222498 and US 5052122 corresponding to it, JP-A 2-222499, JP-A 3-33199 and EP-A 339996 corresponding to it, JP-A 5-86400 and US 5282996 corresponding to it, and JP-A 5-209200 and US 5468516 corresponding to it.
• a small portion of the crystalline aluminosilicate may be added during the granulation or just before the completion of the granulation as the surface modifier for the granules.
• a crystalline silicate it is preferable that the silicate be added in the step of enhancing the bulk density or dry-blended with the granules.
• an alkali metal carbonate it may be added to the slurry or at any step during the granulation, or dry-blended with the granules.
• the high-density powdered detergent composition of the present invention has a mean particle diameter of 200 to 1000 ⁇ m, particularly 200 to 600 ⁇ m. Further, the detergent composition of the present invention has a bulk density of 0.6 to 1.2 g/ml, preferably about 0.6 to 1.0 g/ml.
• the detergent composition of the present invention may be used in a suitable concentration, which depends on which of several washing methods (such as machine washing and immersion) is employed, quantity of clothes or water, extent of stains, operating conditions of the machine, or the like.
• the composition may be used in a concentration of 0.03 to 0.3 % by weight.
• the present invention can provide a high-density powdered detergent composition which contains both an organic builder excellent in biodegradability and an inorganic builder and is enhanced in detergency.
• An aqueous slurry having a solid content of 60 % by weight was prepared by using 1.0 kg of ASDA, 0.5 kg of crystalline aluminosilicate, 4.0 kg of LAS, 0.4 kg of AA-MA copolymer, 0.4 kg of FA, and 0.73 kg of soda ash (sodium carbonate).
• the obtained slurry was subjected to spray drying.
• the particles thus obtained were put in a Lödige mixer (mfd.
• the other high-density powdered detergent compositions were also prepared according to the same procedure as that described above except that components listed in Tables 1 and 2 were used in proportions specified in Tables 1 and 2.
• the obtained powdered detergent compositions had bulk densities of 0.800 ⁇ 0.050 g/ml.
• the high-density powdered detergent compositions were subjected to the following detergency test and solubility test. The results are given in Tables 1 and 2.
• washing conditions are as follows: • Washing conditions washing time: 10 min, detergent concn.: 0.067 w/v%, hardness of water: 4° DH, temp. of water: 20 °C, and rinsing: with tap water (running water) for 5 min.
• a sample powdered detergent composition was classified by the use of sieves having opening sizes of 710 ⁇ m and 1000 ⁇ m respectively to obtain a fraction composed of particles having diameters falling within a predetermined range.
• one liter of tap water having a temperature of 5 °C was put in a beaker having a capacity of one liter, and a stirrer piece was thrown into the water and revolved at about 550 rpm to thereby agitate the water.
• a predetermined amount of the above fraction was thrown into the water.
• the conductivity of the contents of the beaker was determined with the lapse of time by the use of CM-60S mfd. by Toa Denki Kogyo K.K.
• the conductivity value of the solution obtained by completely dissolving the fraction in the water being taken as the reference, the time elapsed (T90, unit: s) until the conductivity of the contents had reached 90 % of the reference was determined and employed as an indication of the solubility of the detergent composition.

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• 1996
  • 1996-02-21 JP JP3378896A patent/JP3221830B2/ja not_active Expired - Fee Related
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