MXPA02000596A - Liquid abrasive cleaning compositions. - Google Patents

Abstract

The invention concerns aqueous liquid abrasive cleaning compositions comprising a 10-95% of a solid abrasive and 0.05-0.70% of an anionic thickening polymer and not more than 1.0% surfactant. The cleaning compositions may be in concentrated form containing 45% abrasive or more, which can be used as such or on dilution yield a ready to use abrasive composition. Alternatively they may be in a ready to use form containing 55% or less abrasive.

Description

COMPOSITIONS FOR CLEANING, ABRASIVE. LIQUID FIELD OF THE INVENTION The invention relates to liquid, aqueous compositions that include an abrasive and a thickening, polymeric agent to keep the abrasive suspended in the liquid.

BACKGROUND OF THE INVENTION

[0002] Cleaning, abrasive, liquid compositions are well known in the art and typically comprise a combination of detergent surfactants, particularly anionic and nonionic surfactants, which together form a phase of lamellar micelles and thereby cause the thickening of the liquid. The lamellar phase acts as a suspension system to keep the solid abrasive in a stable suspension. Frequently, an electrolyte is added to further improve the stability of the suspension. However, detergent surfactants are expensive components and it is not always clear whether apart from their thickener and suspension action actually adds to the cleaning efficiency of the compositions. Therefore, several attempts have been made to reduce the amount of surfactant and provide the thickening power and REF: 134804 .A t. i-i suspension nsary to keep the abrasive in stable suspension by the addition of the polymeric thickeners. Thus, WO 91/08283 describes cleaning, abrasive, liquid compositions comprising 0.02-20% detergent, 1-70% abrasive in the form of particles and 0.01-10% of a thickener mixture consisting of a non-starch type polymer, linear, and a starch, branched polymer (amylopectin). The non-starch type polymers include various natural gums and synthetic polymers. Partially acetylated xanthan is particularly preferred. In practice, the required amounts of thickener mixture are about 3% by weight of the total composition and the examples all specify 1.5% nonionic surfactant. In WO 95/08619, abrasive, liquid cleaning compositions comprising a crosslinked polyacrylate, either at least one nonionic surfactant or a combination of an anionic surfactant and a nonionic surfactant, an adjusting agent, are described. of pH, and a calcium carbonate abrasive. The compositions are said to contain 0.1-2% polyacrylate, 0.1-10% nonionic, up to 10% anionic and 5-60% abrasive. In practice, according to the examples they contain 0.25 - 0.4% polymer, 0.5% or more nonionic and 40% abrasive. The non-ionic is required to provide the correct viscosity characteristics. EP 649898 discloses similar compositions with the additional condition containing hypochlorite and that the surfactant is stable to the bleach. WO 96/35771 discloses abrasive, liquid cleaning compositions comprising 10-30% inorganic abrasive and a thickening agent consisting of at least one crosslinked polyacrylate polymer and a smectite-like clay, whereby the latter form approximately 50-80% of the thickener system. The thickening system preferably comprises 1-2.5% of the composition. In practice, the cleaning compositions contain all at least 0.5 polyacrylate and at least 0.75% clay. EP 0 352 358 describes suspensions of powders based on very fine silica, such as zeolites, which comprises organic polymeric compounds with hydroxyl groups and a molecular weight above 1500 as suspending agents and which require the presence of certain cationic surfactants or zwitterionics as stabilizers. The particle size of the zeolites to be suspended is generally between 0.5 and 10 μm, with the volume of the material having a particle size below 6 μm. The only exemplified polymers are combinations of guar and xanthan gums. In EP-A-0 875 557, a composition is described jtJk * i. ai -i thickener, aqueous suitable for a variety of final applications, comprising 0.04-30% w / w of a mixture of at least two surfactants in a specific ratio and with a difference in HLB of at least one unit and 0.01- 5% w / w of an assocd thickener selected from hydrophobically modified hydroxyethylcellulose, hydrophobically modified nonionic polyol and hydrophobically modified alkali soluble emulsion polymer. In practice, the amount of assocd thickener is 1-2% and the amount of surfactant mixture is 1-10%. EP 0 301 885 discloses abrasive, liquid cleaning compositions comprising up to 70% abrasive, an aqueous suspension medium made from a combination of anionic surfactants and electrolyte and also comprising a polyacrylate material having a molecular weight of between 500 and 3000. The compositions in practice contain at least 3.5% surfactant. Cleaning, abrasive, liquid compositions are usually sold in a ready-to-use form containing 10-50%, generally 20-45% solid abrasive. These compositions can not be diluted, for example, to a solid abrasive content of 10-20% without losing their stability, which leads to sedimentation. Although the patent literature cites abrasive contents of up to 70%, these contents are not normally found in commercial products.

Brief description of the invention It is an object of the present invention to provide stable, aqueous, liquid, abrasive, cleaning compositions that do not require detergent surfactant to obtain a stable suspension. It is a further object of the invention to provide cleaning, abrasive, aqueous, liquid compositions in which the abrasive is suspended with a polymeric thickening agent. It is still a further object of the invention to provide cleaning, abrasive, aqueous compositions that can be provided either in ready-to-use form, or in a concentrated form that is to be diluted by the consumer to a ready-to-use product without that long-term stability is lost. Accordingly, the invention provides cleaning, abrasive, aqueous, liquid compositions comprising an insoluble abrasive and a thickener, anionic polymer.

DETAILED DESCRIPTION OF THE INVENTION All percentages given herein are by weight and are based on the total composition unless otherwise specified. The term "liquid" as used herein refers to products that are easily pourable, as well as products that are thick, almost paste-like, but because of their flow properties they can still be physically classified as liquids. The aqueous, liquid, abrasive cleaning compositions according to the invention comprise 10-95% of a solid abrasive, 0.05-0.70% of an anionic thickener polymer and not more than 1.0% of surface active agent. A particulate, solid, suspended, dispersed abrasive is an essential ingredient of the liquid abrasive compositions according to the present invention. Preferably, the amount of abrasive is at least 20% and for practical purposes in general no more 15 out of 80%, most preferably at 75% much. The products can be formulated and packaged as ready-to-use compositions having an abrasive content as specified above. These compositions can have the form of products type almost 20 pastes, viscous, thick or they can have the form of easily pourable liquids, which can be easily distributed from a bottle with a relatively narrow opening and are similar in appearance to the products currently known in the market as "abrasive cleaners". 25 liquids. "Thick-viscous type of ready products for use it preferably has a high content of abrasives of at least 45%, more preferably more than 50%, still more preferably at least 55%, more preferably at least 60%. The pourable liquid of ready-to-use compositions, on the other hand, preferably has a low abrasive content, that is, below 55%, more preferably 50% less, even more preferably at much Four. Five %. Alternatively, the compositions of the invention can be formulated and packaged as concentrates that are diluted prior to use by the addition of a suitable amount of water. These compositions have the advantage that they require a smaller package for the same final amount of the ready-to-use product and thus provide an advantage in storage and transportation. They can be prepared and transported in bulk as intermediate products to a production facility close to consumers where they are diluted with water and then packaged or packaged and sold as ready-to-use products. On the other hand, they can also be packed directly and sold as concentrates, which will be diluted with water by the consumer at home. These products also have a high content of abrasives preferably at least 45%, more preferably more than 50%, even more preferably at least -ete i i -r j * ¿* .UJ ^? . .L¿ * i .t. t M 55%, more preferably at least 60%. Preferred abrasives have a Moh hardness of below 6, but above 1, although higher hardness abrasives may be used for specialized applications. Preferably, the hardness is at least 2. Suitable abrasives can be selected from inorganic abrasives such as zeolites, silicas, carbonates, aluminas and organic polymeric abrasives such as polyethylene, polycarbonate, polyurethane, polystyrene, polypropylene, polyethylene terephthalate , polymethylmethacrylate and nylon, and mixtures thereof. Preferred abrasives are: calcium carbonate (such as calcite), mixtures of calcium and magnesium carbonates (such as dolomite), zeolite, alumina, hydrated alumina, fendespate, talc and silica. Calcite and dolomite and mixtures thereof with lower amounts of silica, especially amorphous silica, are particularly preferred because of their low cost and good abrasive properties. Preferred weight average particle sizes for abrasives fall in the range of 0.5-500 microns, with values of 10-100 microns being particularly preferred. In this interval, an acceptable compromise between good cleaning behavior and low substrate damage is achieved. However, for the silica to be used in combination with calcite or dolomite, an average particle size in the range of 100-500 microns is very suitable as well. The anionic polymers are used to obtain a stable suspension of the abrasive particles in the aqueous medium. They are available in various forms and from many suppliers, for example as aqueous suspensions or in powder form, solid. Additionally, it may be hydrophobically modified and / or crosslinked. By products "of "High abrasive content", ie, products in which the amount of abrasive is at least 45%, more preferably more than 50%, still more preferably at least 55%, more preferably at least 60% %, the polymers are preferably used in an amount of at least 0.07%, 15 more preferably at least 0.10, more preferably 0.15% or more. For these products, the maximum level of polymers in general does not exceed 0.65% and preferably at or below 0.60, more preferably less than 0.50 or even 0.45%, more preferably by 20 below 0.40 or even 0.35%. For easily pourable, ready-to-use products, on the other hand, the amount of polymer is at least preferably 0.07% and more preferably at least 0.10%, with maximum levels that are lower Preferably 0.50%, more preferably at much 0. 40% or even 0.35%, more preferably at or below 0.30 or even 0.25%. Suitable polymers are high molecular weight products, ie, having a molecular weight of at least 10,000, particularly at least 50,000 or even 100,000. Suitable polymers to be found among polycarboxylate type polymers, such as various polyacrylate and co-polymer homopolymers having in general a molecular weight of 500,000 or more, frequently more than 1,000,000, and various polysaccharides, such as carboxy-methylcelluloses , hydroxyethylcellulose, hydroxypropylmethylcellulose, carrageenan, alginate, tragacanth gum, acacia gum, guar gum, xanthan gum. Very suitable are synthetic polycarbonate polymers, for example, hydrophobically modified emulsion polymers and carbomers (powdered polyacrylic acids, solids). The above are particularly useful for "low-abrasive" products, while the latter are particularly useful for "high-abrasive" products. Suitable hydrophobically modified emulsion polymers should preferably have 0 or at least 1000 Pa.s. (determined in 0.5% solution in water that also contains 0.4% of Genaminox CSLMR (MR for amine-oxide sold by Clariant), for the meaning of? n0: see later). Suitable polymers include: ACUSOL HASE and ASE series such as 820 and 842; POLYGEL / NEUTRAGEL series such as W30, DA, DS, DR and 5 DB; RHEOVIS series such as CRX Series CARBOPOL such as Aqua 30, ETD 2690, ETD 2691, ETD 2623, EZ-1, EZ-2, EP-1, LNP-3, 663, 664, 674, 674, 1610, 1621, 1622 and 1623; 10 PEMULEN Series such as TR1 and TR2; STRUCTURE 2001, 3001; ALCOGUM SL-70 and SL-78. ACUSOL is a trademark of Rohm & Haas; CARBOPOL and PEMULEN are trademarks of B F 15 Goodrich; POLYGEL and NEUTRAGEL are trademarks of Sigma 3V; RHEOVIS is a trademark of Ciba Specialties; 20 STRUCTURE is a trademark of National Starch & Chemical Co.; ALCOGUM is a trademark of Aleo. Some of these thickening polymers, such as Carbopol ETD-2690, lose their thickening properties in the presence of an appreciable amount of calcium ions. By therefore, when using calcite or a similar abrasive containing Ca, care must be taken to use a thickening polymer that is not Ca sensitive (such as Carbopol 674). Other thickening agents, such as thickener clays or thickener silica are not necessary to achieve the required suspension stability and preferred embodiments of the invention do not contain these thickeners. As summarized above, no surfactant is needed in the compositions according to the invention 10 for stability reasons. However, it may be useful to add a limited amount of detergent surfactant to improve the cleaning properties of the products in certain types of floors and / or to foaming during the use that is desired by some consumers. The 15 nonionic, anionic, zwitterionic and amphoteric surfactants can be used. Nonionic surfactants are preferred. The nonionic surfactants can be combined with other kinds of surfactants, particularly with surfactants 20 anionics. In general, the presence of zwitterionic or cationic surfactants, although not possible, does not serve any useful purpose and compositions without these surfactants are a preferred embodiment of the invention. 25 Suitable nonionic surfactants are ? More a &iiiii.i i. ... juL-fc »* -'- * ^ - ^ ¿ÜÜ - ~~ ~. . . * ..,. * *. *. * .. ^ *. ^. . ,. . ~ .j *? .. t. *, can be broadly described as compounds produced by the condensation of alkylene oxides which are hydrophilic with an organic hydrophobic compound which may be aliphatic or alkyl aromatic. The length of the hydrophilic polyalkylenoxy group that is condensed with any particular hydrophobic group can be easily adjusted to produce a water-soluble compound having the desired degree of equilibrium between the hydrophilic and hydrophobic elements. Particular examples include the condensation product of aliphatic alcohols having 8 to 22 carbon atoms in the straight or branched chain configuration with ethylene oxide, such as an ethylene oxide condensate of coconut oil having 2 to 15 mmoles of ethylene oxide per mole of coconut alcohol; condensates of alkylphenols whose alkyl group contains from 6 to 12 carbon atoms with 5 to 25 moles of ethylene oxide per mole of alkylphenol; condensates of the reaction product of ethylene diamine and propylene oxide with ethylene oxide, the condensate containing from 40 to 80 5 of ethyleneoxy groups by weight and having a molecular weight of 5,000 to 11,000; tertiary amine oxides of the structure R3NO, wherein one group R is an alkyl group of 8 to 18 carbon atoms and the others are each methyl, ethyl or hydroxyethyl groups, for example, dimethyldodecylamine oxide; tertiary phosphine oxides of the structure R3PO, wherein one group R is an alkyl group of 10 to 18 carbon atoms, and the others are each alkyl or hydroxyalkyl groups of 1 to 3 carbon atoms, for example dimethyl dodecyl oxide -phosphine; and di-alkyl sulfoxides of the structure R2SO wherein the group R is an alkyl group of 10 to 18 carbon atoms and the other is methyl or ethyl, for example methyltetradecyl sulfoxide; fatty acid alkylolamides; alkylene oxide condensates of fatty acid alkyl amides and alkyl mercaptans. The non-ionic can also be selected from a range of alkyl polyglycosides. Particularly suitable are ethoxylated aliphatic alcohol surfactants, such as C9-11 5EO, C12-C13 6.5EO and C13-C15 7EO (numbers EO are averages), and tertiary amine oxides such as dimethyldodecylamine oxide and dimethyldecylamine oxide or mixtures of amine oxide containing a large portion of these. Suitable anionic surfactants are water-soluble salts of organic esters of sulfuric acid or sulfonic acids having in the molecular structure an alkyl group containing from 6 to 22 carbon atoms. They are usually added to provide the compositions with good foaming properties, which are often considered desirable by the consumer. Examples of these anionic surfactants are water soluble salts of: long chain alcohol sulfate (ie 8-22 carbon atoms) (referred to later as PAS), especially those obtained by sulfating the fatty alcohols produced by reducing glycerides of sebum or coconut oil; alkyl benzene sulfonate, such as those in which the alkyl group contains from 6 to 20 carbon atoms; secondary alkanesulfonates (hereinafter referred to as SAS). Also suitable are the salts of: alkyl glyceryl ether sulfates, especially those ethers of the fatty alcohols derived from tallow and coconut alcohol: fatty acid monoglyceride sulfate; sulfate of the reaction product of one mole of a fatty alcohol and from 1 to 6 moles of ethylene oxide; salts of alkylphenol ethyleneoxy ether sulfates of 1 to 8 ethyleneoxy units per molecule and in which the alkyl groups contain from 4 to 14 carbon atoms; and mix of them. Preferred anionic, water soluble synthetic surfactants are the sodium, potassium, magnesium and ammonium salts of the alkyl benzene sulphonates, olefin sulphonates and alkyl sulfates, and the monoglyceride sulfates of fatty acids. Amphoteric surfactants which may be optionally employed are derivatives of aliphatic secondary and tertiary amines containing an alkyl group of 8 to 18 carbon atoms and an aliphatic group substituted by an anionic group of water solubilization, for example, 3-dodecylamino- sodium propionate, sodium 3-dodecylaminopropane sulfonate and sodium N-2-hydroxydecyl-N-methyl-taurate. Additional examples of suitable surfactants are compounds commonly used as surface active agents mentioned in the well-known textbooks "Surface Active Agents", Volume I by Schwartz and Perry and "Surface Active Agents and Detergents", Volume II by Schwartz. , Perry and Berch. The compositions according to the invention may contain a total amount of 0-1% of the surfactant, preferably below 0.5%. More preferably, the total level of surfactant does not exceed 0.4% or even 0.3%. For a useful increase in cleaning and / or foaming properties, a minimum level of 0.01% of the total surfactant is desirable, preferably at least 0.02%, more preferably at least 0.05%, or even 0.1%. The level of nonionic surfactant must Preferably, it is below 0.5%, more preferably it must be at or below 0.45% and more preferably at or below 0.35% or even 0.3%. To improve the cleaning properties of the composition, as well as the stability of the suspension, the non-ionic level is preferably at least 0.01%, more preferably at least 0.02%. For concentrated products, the amount of nonionic is more preferably 0.02%, more preferably at least 0.03%. The compositions according to the invention are alkaline, more particularly they have a pH above 8, preferably 9 or higher. In this way, the compositions can be made alkaline with the use of a suitable base such as alkali metal hydroxide or carbonate, ammonia or an organic base with pKa above 9 such as triethylamine, amino-methylpropanol (AMP), aminobutanol, mono-, di- or tri-ethanolamine, monoisopropylamine or aminomethylpropanediol. The AMP is particularly useful and preferably if it is added in an amount of up to 0.5%, more preferably 0.2-0.4% in the presence of another base or 0.1-0.2% in the presence of another base. The compositions according to the invention do not generally need any additional electrolyte other than the possible anionic surfactant and the basis for pH adjustment. Preferably, the additional electrolyte level is below 0.3%, more preferably 0.2%.

Optional Components The abrasive compositions according to the invention may contain optional components that improve their cleaning properties such as organic solvents known in the art for use in abrasive cleaning compositions, particularly solvents of which the molecules have a polar group, such as hexanol, alkyl ethers of ethylene- and propylene glycol. They may also contain bleaching agents, particularly halogen bleaching agents, more particularly hypochlorite with the proviso that polymers and hypochlorite-stable surfactants are used. Additionally, they may contain additional components such as: components to further increase their attraction to the consumer, such as dyes, optical brighteners and particularly perfumes (perfumes may have an additional positive influence on the stability of the suspension); conservatives to prevent microbial contamination.

Liquid Properties The satisfactory, "low-abrasive," ready-to-use, abrasive, liquid cleaning compositions according to the invention have fluid flow characteristics such that they are stable suspensions when not in use, but sufficiently diluted to pour the liquid from the packing container and spread it on the dirty surface without seeming diluted and watery. In this way, the liquid product preferably has the following liquid flow properties:? 0 is at least 1500 Pa. s sc is 2.5-25? 21 is at least 0.1 Pa.s Where:? 0 is the viscosity at a zero cutting speed (determined by extrapolation); sc is the shear stress at which the viscosity is 0.1.?0; and? 21 is the viscosity at a cutting speed of 21 s. Preferably? 0 is at least 2000 Pa.s, more preferably at least 2500. Preferably? 21 is 0.3-5.0, more preferably, 0.6-1.8, more preferably, 1.0-1.5 Pa.s.

The measurements are made in: CSL 100 (TA Instruments) with a measurement system -. ** & ? of pallet and basket (internal diameter of the basket 48 mm, blade diameter 38 mm and height of 24.5 mm) to measure the viscosity of an effort (s) of 0.01 Pa at the effort required to give a cutting speed of 1 s "1; Haake RV20 with an M5 measuring head and a SV2p measurement geometry to measure the viscosity between the cutting speeds of 0.1 and 389 sA All measurements were made at 20 ° C., abrasives, liquids, concentrates of "high content of abrasives" satisfactory are liquids or pastes which are suitable for dilution with water at 1.2-4 times, preferably 1.5-3 times, more preferably 2-3 times, the original volume, thereby producing a stable, ready-to-use, abrasive, liquid, cleaning composition, preferably a cleaning composition with the liquid flow properties specified above. Clean, abrasive, liquid, ready-to-use, "high-content abrasive" cleaning compositions are generally viscous, or almost paste-like liquids. Although they do not generally spread easily when placed on a surface, they obtain a smooth, "uninterrupted" surface again when left alone for a few minutes to a few hours in the container. These products are not preferentially packaged in a container from which containers, such as a bucket or tub, have been dispensed by emptying, from which suitable quantities can be taken in a suitable applicator such as a cloth or sponge. wet, or containers from which they can be dispensed by squeezing, such as a tube, are very useful.

Preparation The compositions according to the invention can be prepared simply by mixing the various components. It is preferred to first make a dilute aqueous solution (for example 1.2%) or dispersion of the polymer and then mix in the other components subsequently. The other components can be made first in a slurry with the remaining amount of water after which the solution (dispersion) and the slurry are mixed. Sometimes, it is advantageous to neutralize the aqueous polymer solution with part of the base before mixing it with the other components.

EXAMPLES Examples 1-4 Cleaning, abrasive, liquid compositions were prepared according to Examples 1-4 in Table I. h ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ Table 1 Ingredients Level of Percentage 1 2 3 4 NEODOL 135-7E "0.08 0.08 0.13 0.12 Calcite 35.00 45.00 57.36 70.13 ACUSOL 820 0.26 0.26 0.43 0.41 NaOH 0.055 0.055 0.09 0.09 Perfume 0.30 0.30 0.49 0.47 Water 64.31 54.31 41.50 28.79 Total 100 100 100 100 1) Alcohol of C13-15 with 7EO (average) marketed by Shell The compositions were prepared by first diluting the ACUSOL solution to 30% by weight to 1% by weight and neutralizing it with NaOH solution. The ACUSOL solution is stirred at room temperature until it appears homogeneous, while care is taken that the solution is not aerated. The remaining components and the rest of the water in the formula are converted into an aqueous suspension of the ACUSOL solution is added carefully while stirring. Agitation is continued until a homogeneous suspension is obtained, again taking care that aeration is avoided. A composition identical to Example 1 was prepared t? »? > * t L **** ^ ***. * «*. - OR"", .. * **"****,* * *-***.. .,*,*..**-. , *. .- * ... .. -. «.ír ^ í- ?? diluting an amount of the composition of Example 3 with an equal volume of water followed by stirring. Likewise, a composition identical to Example 2 was prepared by diluting an amount of Example 4 with an equal volume of water. The six examples for stability were tested by storing samples thereof for three months at 37 ° C, 20 ° C and 4 ° C. Other samples are taken through the three freeze / thaw cycles. None of the samples showed any visible sedimentation.

Examples 5-6 Cleaning compositions, abrasives, concentrates having the composition described in the Table II were prepared by making a 2% dispersion of the polymer in water and by adding this, with stirring, to a slurry of calcite, surfactant, NaOH and perfume in the remaining amount of water. Stirring is continued until a homogeneous mixture is obtained. The composition can be diluted by adding an equal volume of water and shaking briefly, to obtain ready-to-use cleaning compositions containing % abrasive. to . Í -? ?.? you. «? ^^ ** ií. -.- * á á - Table II Ingredients Level of Percentage 5 6 NEODOL 135-7E 0.13 0.13 Calcite 70.13 70.13 CARBOPOL 674 0.28 POLYGEL DR 0.20 NaOH 0.09 0.09 Perfume 0.48 0.48 Water 28.89 28.97 Total 100 100 The samples of the concentrated as well as the diluted compositions were tested for stability as described for Examples 1-4 and no visible sedimentation was shown.

Fillers 7-13 High foaming ready-to-use abrasive cleaning compositions were prepared by making the compositions described in Table III below, made up to 100% with water. -ÁFC & ^^^ st ^^^^^^^^^^^^^ ñ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Bi ^^^^ i The polymer was Poligel DR, the amine oxide was Genaminox CSL, the calcite was Omyacarb 30. All the examples additionally contained 0.4% perfume.

Example 14 A ready-to-use product of "high abrasive content" was prepared having the composition described below: Acusol 820 0.280% Genaminox CS1 0.400% Na hydroxide 0.051% Omyacarb 65 65.0% Proxel GXL (preservative) 0.016% Water Up to 100% - - »- - < * - The product had pH 9.8 and a density of 1.8 g / cm3. It was stored in a tub from which it can be easily taken in a wet cloth to be applied to a surface to be cleaned. The surface of the product that remained in the tub restored its smooth appearance and level again after it is left for half an hour.

It is noted that in relation to this date, the best method known by the applicant to carry out the present invention is that which is clear from the present description of the invention. h * t? you > *.? *? * TECH "" i irtffMr? • --tii-Hil iii •% - * • ** "- - * ** ^ * .- * - * - .. ****** *. *. *? * ~ ... ** . > - **. * tJL ,. >

Claims (11)

1. CLAIMS Having described the invention as above, the content of the following claims is claimed as property: 1. Cleaning compositions, abrasive, liquid, alkaline, aqueous, comprising a solid abrasive and an anionic thickening polymer characterized in that the abrasive is present in a amount of more than 50% to 80%, the anionic polymer in an amount of 0.07-0.45%, the composition contains less than 0.5% of surfactant and does not contain thickener clays or thickener silica. 2. The compositions according to claim 1, characterized in that the amount of abrasive is 55%. The compositions according to claim 1 or 2, characterized in that the abrasive is chosen from zeolites, silicas, silicates, carbonates, aluminas and organic polymeric abrasives with a particle size of at least 10 microns. 4. The compositions according to claim 3, characterized in that the abrasive is chosen from calcium carbonate, mixtures of calcium and magnesium carbonates. The compositions according to any of claims 1-4, characterized in that the anionic polymer is a polycarboxylate polymer selected from polyacrylate homopolymers, polyacrylate copolymers and polysaccharides with a molecular weight of at least 10,000. 6. The compositions according to any of claims 1-5, characterized in that they contain at least 0.01% of a nonionic, anionic or amphoteric surfactant, but not a zwitterionic or cationic surfactant. The compositions according to claim 6, characterized in that they contain 0.01-0.45% nonionic surfactant. 8. The compositions according to claims 6-7, characterized in that they also contain an anionic surfactant. 9. The compositions according to claims 1-8, characterized in that they have a pH above 8. 10. The compositions according to any of claims 1-9, characterized in that they contain 0.10-0.40% of anionic polymer. . 11. The compositions according to any of claims 1-10, characterized in that they are packed in a tub or tray. t ^ ^ i & * á ~ *