HUP0300292A2 - Solid dispersible abrasive compositions and process for preparing cleaning compositions by their use - Google Patents

Abstract

Liquid detergents with an abrasive effect produced from abrasive compositions that can be dispersed in a liquid medium can be used to clean hard surfaces. The anhydrous solid scrubbing compositions comprising the solid scrubbing material according to the invention contain a suspending mixture which allows the compositions to be mixed with a liquid material to form a stable suspension. According to the process according to the invention, liquid cleaning agents with a scrubbing effect are produced by mixing water-free scrubbing compositions with some liquid substance. HE

Description

Abrasive compositions comprising solid abrasives and a process for producing cleaning agents using the same

The invention relates to solid, anhydrous scouring compositions comprising a solid abrasive material, and to a process for preparing liquid scouring cleaning agents based on their use. Liquid scouring cleaning agents prepared from scouring compositions dispersible in a liquid medium can be used for cleaning hard surfaces.

Abrasive liquid cleaning agents for use on hard surfaces are well known in the art and typically comprise a mixture of detergent surfactants, primarily anionic and nonionic surfactants, which form a lamellar micelle phase with each other and therefore thicken the liquid. The lamellar phase acts as a suspending agent to form a stable suspension with the solid abrasive. An electrolyte and/or a polymeric thickener are often also used to further enhance the stability of the suspension.

For example, WO 91/08283 discloses liquid abrasive cleaning agents which contain 0.02-20% detergent, 1-70% particulate abrasive and 0.01-10% thickening agent mixture consisting of a non-starch type straight chain polymer and a starch type branched chain polymer (amylopectin). Non-starch type polymers include various natural gums and synthetic polymers. Our File Number: 97500-2227C/KmO

Our administrator: Dr. Tivadar Palágyi

- 2 tozn. It is particularly preferred to use partially acetylated xanthan. The amount of thickener mixture usually required is about 3% by weight, based on the total amount of the agent, and the amount of nonionic surfactant is 1.5% in all examples.

The abrasive liquid cleaning compositions disclosed in International Publication No. WO 95/08619 comprise a crosslinked polyacrylate, a pH adjusting agent, a calcium carbonate abrasive and at least one nonionic surfactant or a mixture of an anionic surfactant and a nonionic surfactant. According to the publication, the compositions comprise 0.1-2% polyacrylate, 0.1-10% nonionic surfactant, up to 10% anionic surfactant and 5-60% abrasive. The examples typically include 0.25-0.4% polymer, at least 0.5% nonionic surfactant and 40% abrasive. The nonionic surfactant is required to provide the appropriate viscosity properties. Similar compositions are disclosed in US Pat. No. 649,898. also in the European patent specification, but it is specifically stated that the agents must also contain hypochlorite and the surfactant must be stable against bleaching agents.

The aqueous thickening compositions described in European Publication No. 875 557, suitable for various end-use purposes, contain 0.04-30% by weight of a mixture of at least two surfactants having HLB values different from each other by at least ^one unit, and 0.01-5% by weight of an associative thickener. The associative thickener may be a modified hydrophobic hydroxy-3-ethyl cellulose, a modified hydrophobic nonionic polyol, or a modified hydrophobic alkali-soluble emulsion polymer. The amount of the associative thickener used is typically 1-2%, and the amount of the mixture containing surfactants may be 1-10%.

Liquid abrasive cleaners for hard surfaces are usually sold in ready-to-use form. The products sold contain 10-50%, and in most cases 30-45%, solid abrasive. These products cannot be diluted to a solid abrasive concentration of 10-20% without losing their stability, which is manifested by sedimentation. Although the patent literature mentions formulations containing up to 70% abrasive, such concentrations are not usually found in commercially available products.

Before liquid abrasive cleaners became popular, it was common practice, and still is in some countries, to clean hard surfaces with powdered abrasive compositions. These compositions consist almost entirely, or at least 95%, of powdered abrasive, with a small amount (less than 5%) of a foaming surfactant present. The compositions are applied directly to the hard surface to be cleaned, using a small amount of water, such as that present in a damp cloth. The surfactant aids in cleaning by improving the wetting properties of the water/abrasive mixture on the surface, and by developing a foam that makes the cleaning visible to the eye. 153 680

- Polish patent specification No. 4 describes, for example, solid abrasive cleaning agents - which contain 45-95% ground quartz, ground feldspar or ground glass, 1.5-23% synthetic anionic or nonionic surfactants, in particular Na LAS and alkylene oxide copolymer -, a chlorine compound with a bleaching effect, 0.1-50% phosphoric acid/urea complex and 0.1-25% sodium sulfate. Similar compositions are known from British patent specification No. 1,339,274, which also contain, as an additional component, a compound which generates heat when water is added to the compositions during the cleaning operation. No. 2,106,376 Russian patent specification discloses abrasive powder cleaning agents containing ground quartz and sodium polyacrylate as a surfactant. The product is intended for application purposes similar to those of conventional abrasive powders. Japanese publication No. 02029497 discloses abrasive powder cleaning agents in powder or liquid form containing hydroxyapatite as an abrasive and a surfactant. European publication No. 821 721 discloses ready-to-use scouring powders comprising a mixture of sodium carbonate and sodium bicarbonate as water-soluble abrasives, an anionic detergent and a solid hypochlorite bleach.

By simply adding the right amount of water, the previously known abrasive powder detergents cannot be converted into abrasive liquid detergents because the surfactant present in the powder mixture was not intended for this purpose - nor is it intended to be.

- 5 would be able to - form the lamellar micelle phase necessary to keep the solid abrasive in a stable suspended state. thus the abrasive would quickly separate and settle to the bottom of the container.

It would be useful, however, to have available, whether in the form of powder, granules or other suitable solid formulation, a water-free mixture from which an abrasive liquid cleaning agent could be readily prepared, i.e. which could be converted by adding a suitable amount of water into a ready-to-use and stable abrasive liquid cleaning agent. This would save packaging and shipping costs associated with transporting large quantities of water and would not require storage conditions that would adversely affect the stability of the ready-to-use liquid mixture.

Abrasive waterless soap powders are also known, which can be used to remove even stubborn dirt from the skin. Such products are described, for example, in U.S. Patents 4,786,432 and 4,786,369. These products consist of abrasive particles coated with an anionic surfactant, most often a fatty acid soap. Abrasives generally contain less than about 80% of the abrasive, and most often not more than about 50%. The compositions of solid particles freely rolling on each other, described in European Patent Specification 796,318, were developed for hand cleaning. They are produced by fluidized drying and granulating a mixture of detergent paste and abrasives such as pumice, wood flour, ground walnut shells or chopped vegetable fibres. These powders are not intended to be mixed with water before use and the soap particles contained therein do not have any abrasive suspending properties.

International Publication No. WO 94/25563 discloses tablets, blocks or other similarly shaped products comprising surfactants and optionally abrasives. These products are intended for use in cleaning devices and are clearly unsuitable for the preparation of a stable suspension. It is noted here that the blocks and their use do not require a suspending mixture.

However, there is no indication that any of the solid products described above can be converted into a stable suspension.

The present invention provides anhydrous solid compositions which can be mixed with a liquid material to form ready-to-use, stable liquid cleaning compositions for use on hard surfaces. The anhydrous compositions thus comprise a solid abrasive material and a suspending agent which, when mixed with the liquid material, maintains the abrasive material in a stable suspension.

The invention also relates to a process for producing liquid abrasive cleaning agents, which comprises mixing anhydrous compositions comprising a solid abrasive and a suspending mixture.

- 7 with any liquid material. To implement the method according to the invention, it is not necessary to mix additional components.

The invention also relates to liquid abrasive cleaning agents prepared by the process described above.

In the description, unless otherwise indicated, all percentages are in % by weight of the total amount of the composition.

The essential components of the waterless scrubbing compositions of the invention are: a solid scrubbing agent as a main component, preferably at least 55%, and a suspending agent, preferably at least 0.1%, which is capable of forming a stable suspension when mixed with a liquid material. The compositions also contain, as a highly recommended but not essential component, a foaming surfactant, preferably at least 0.1%.

The consumer can prepare the ready-to-use, abrasive liquid cleaning agent from the water-free compositions at home by mixing a liquid material. It is also possible to deliver the water-free compositions to a plant where a simple mixing device is sufficient to produce ready-to-use, abrasive liquid cleaning agents, which can be packaged and delivered to the consumer.

The liquid material may be any suitable liquid which is safe for use by the consumer. The liquid material must therefore not be harmful to health and, in particular, must not be flammable. Plain water may be used, but certain organic solvents and mixtures containing such solvents and water may also be suitable. It is preferred that the liquid material contains at least 85% water.

The amount of abrasive in the anhydrous compositions is preferably at least 65%, more preferably at least 70%, and even 75%. Any fine particulate solid material known in the art to be suitable as an abrasive can be used as an abrasive. Most known materials are insoluble in water, but suitable water-soluble materials are also known. The preferred abrasives have a Mohs hardness of up to 5, although for special application purposes, abrasives of higher hardness can be used. In general, the lower the hardness of the abrasive, the less damage to the surface, although it is preferable to use an abrasive with a hardness of at least 1 to ensure adequate cleaning performance.

Suitable water-insoluble abrasives can be selected from both synthetic and naturally occurring materials (minerals). Examples include zeolites, silica, silicates, carbonates, alumina, and organic polymer abrasives such as polyethylene, polycarbonate, polyurethane, polystyrene, polypropylene, polyethylene terephthalate, poly(methyl methacrylate), nylon, and mixtures thereof. Preferred abrasives include: calcium carbonate (in the form of calcite), mixtures of calcium carbonate and magnesium carbonate (in the form of dolomite), zeolite, alumina,

- 9 hydrated alumina, feldspar, talc and silica. Due to their cheapness and good abrasive properties, it is particularly advantageous to use calcite and dolomite, as well as mixtures thereof containing a small amount of silica, especially amorphous silica.

Suitable water-soluble abrasives include sodium carbonate, sodium bicarbonate, sodium tripolyphosphate, sodium borate and potassium sulfate. When mixed in water, a water-soluble abrasive forms an aqueous saturated solution of the abrasive and a solid phase consisting of undissolved abrasive particles suspended in the aqueous solution. Such liquid abrasive cleaning compositions are described in European Publication No. 193 375.

The average particle size of the abrasive material is preferably 0.5 to 500 microns, more preferably about 10 to 100 microns. Particles in this range provide an acceptable compromise between good cleaning performance and low surface damage. However, in the case of silica used in combination with calcite or dolomite, very satisfactory results can be achieved with average particle sizes of 200 to 500 microns.

Any suspension mixture known in the art for suspending abrasive particles in liquid abrasive cleaning compositions can be used. Suitable ready-to-use liquid abrasive cleaning compositions prepared from the anhydrous abrasive compositions of the invention should have flow characteristics such that they form a stable suspension when not in use.

- 10 they should be, but at the same time, thin enough to allow the liquid to flow out of the container and spread over the contaminated surface without appearing thin and watery. We therefore use such a type and amount of suspending mixture that after mixing the anhydrous composition with an equal amount of water, the flow properties of the resulting suspension are as follows:

- ηο = at least 2500 Pa s

- _c = 2.5-25 and

- T|2i = at least 0.1 Pa-s, where

- η ₀ is the viscosity corresponding to shear rate 0;

- _c is the shear stress corresponding to the viscosity 0.1 ·η ₀ and

- η ₂₁ is the viscosity corresponding to a shear rate of 21 s ¹ .

The value of η ₂ ι is preferably 0.3-5.0 Pa, more preferably 0.6-1.8 Pa, most preferably 1.0-1.5 Pa.

The following device was used for the measurements:

- CSL 100 (TA Instruments) measuring device equipped with a rotating blade and a basket (inner diameter of the basket 48 mm, diameter of the rotating blade 3 8 mm, height 24.5 mm) for measuring the viscosity between the shear stress (σ) of 0.01 Pa and the shear stress required to achieve a shear rate of 1 s' ¹ and

- Haake RV20 device with M5 measuring head and SV2p measuring geometry, which can measure viscosity between shear rates of 0.1 s' ¹ and 389 s ¹ .

All measurements were performed at 20 °C.

Well-known suspending mixtures contain surfactants or

- 11 a mixture of surfactants — preferably in combination with an electrolyte — is contained in such an amount and ratio that the entire mixture is capable of forming a lamellar micelle phase. This surfactant or one or more of these surfactants may also be a foaming surfactant. In this case, it is not necessary to add a separate surfactant, which may otherwise be used to achieve the desired foaming properties. One or more of the surfactants or surfactants is preferably anionic. Very suitable suspending mixtures can be prepared by combining an anionic surfactant and an electrolyte, a nonionic surfactant or a cationic surfactant. Mixtures which contain an anionic surfactant and a nonionic surfactant — optionally supplemented with an electrolyte — are particularly suitable.

These suspending mixtures in waterless scrubbing compositions preferably include:

• 0.5-30%, preferably 1.5-25%, more preferably

2.5-20% anionic surfactant and 0.2-20%, preferably 1.0-15%, more preferably

1.5-12% nonionic surfactant.

Suitable anionic surfactants are water-soluble salts of organic sulfuric acid esters and sulfonic acids containing aliphatic groups of 8 to 22 carbon atoms, which may be, for example, the following: - sulfates of long-chain aliphatic alcohols, in particular those compounds which can be obtained by sulfating longer-chain alcohols produced by reducing the glycerides of vegetable or animal oils or fats, such as tallow or coconut oil,

- alkylbenzenesulfonates, for example alkylbenzenesulfonates containing an alkyl group of 6 to 20 carbon atoms;

- secondary and primary alkanesulfonates;

- alkyl glyceryl ether sulfates, primarily compounds derived from longer chain alcohols derived from tallow and coconut oil;

- fatty acid monoglyceride sulfates;

- ethoxylated fatty alcohol sulfates containing 1-6 ethylene oxide units per molecule;

- ethoxylated alkylphenol sulfates containing alkyl groups of 4-14 carbon atoms and 1-8 ethylene oxide units per molecule;

- reaction products of fatty acids, such as fatty acids from coconut oil, esterified with isethionic acid and neutralized with sodium hydroxide, and

- mixtures of the above.

Sodium, potassium and magnesium alkylbenzene sulfonates, olefin sulfonates, alkyl sulfates and fatty acid monoglyceride sulfates are very suitable as water-soluble synthetic anionic surfactants in suspending mixtures. These surfactants also function well as foaming surfactants.

If a source of calcium ions, such as calcite or dolomite, is not present, fatty acid soaps can also be used as anionic surfactants. Even in the presence of calcium ions, it may be useful to add a small amount (< 4.5%) of fatty acid to enhance the stability of the suspension after dilution.

- 13 Compounds constituting one group of suitable nonionic surfactants can be broadly defined as condensation products of hydrophilic alkylene oxide groups and aliphatic or alkylaromatic organic hydrophobic compounds. The length of the hydrophilic group or poly(oxyalkylene) group attached to any particular hydrophobic group can be easily adjusted to produce a water-soluble compound in which the hydrophilic and hydrophobic moieties are in the proper balance. This allows the selection of nonionic surfactants with appropriate HLB values.

As a specific example, we mention

- condensation products of aliphatic alcohols with 8-22 carbon atoms, straight or branched, with ethylene oxide, for example the condensation products of alcohol produced from coconut with 2-15 moles of ethylene oxide per mole of alcohol;

- condensation products of alkylphenols having an alkyl group of 6-12 carbon atoms with 2-25 moles of ethylene oxide per mole of alkylphenol and condensation products of ethylenediamine with a mixture of propylene oxide and ethylene oxide, containing 40-80% by weight of ethyleneoxy groups, having a molecular weight between 5000 daltons and 11,000 daltons.

Other groups of nonionic surfactants include:

those tertiary amine oxides - for example dimethyldodecylamine oxide - in which one R in the general formula RRRN0 represents an aliphatic group of 8-18 carbon atoms, and the other R represents

- 14 is an alkyl or hydroxyalkyl group having 1-3 carbon atoms;

- those tertiary phosphine oxides - for example dimethyldodecylphosphine oxide - in which, in the general formula RRRPO, one R represents an aliphatic group having 8-18 carbon atoms and the other R represents an alkyl or hydroxyalkyl group having 1-3 carbon atoms;

- those dialkyl sulfoxides - for example methyl tetradecyl sulfoxide - in which, in the general formula RRSO, one R represents an alkyl group having 10-18 carbon atoms and the other R represents a methyl group or an ethyl group;

- fatty acid alkylolamides;

- condensation products of fatty acid alkylolamides with alkylene oxide and

- alkyl mercaptans.

Particularly useful components in the suspending mixture are the condensation products of aliphatic alcohols with ethylene oxide, and amine oxides. Amine oxides also function well as foaming surfactants.

Suspending mixtures containing one or more polymeric thickeners are also well known. The polymers in these mixtures may be of natural or synthetic origin. Suitable polymers are often of the anionic type, which are available in the form of emulsions or solids, and these polymers may even be modified to be hydrophobic and/or crosslinked. Such polymers include, for example, polymers of the polycarboxylate type - such as homopolymers and copolymers of acrylate, methacrylate and maleic anhydride - and various polysaccharides, such as carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylmethylcellulose, carrageenan, alginates, tragacanth gum, locust bean gum, guar gum, etc. The polymers should dissolve easily and thicken in cold water without clumping.

Suitable polymers include, for example:

- those belonging to the ACUSOL HASÉ and ASE product series, such as 820, 823 and 842;

- those belonging to the POLYGEL/NEUTRAGEL product series, such as W30, DA, DS, DR and DB;

- those belonging to the RHEOVIS product series, such as CRX;

- those belonging to the CARBOPOL product series, such as Aqua 30, ETD 2690, ETD 2691, ETD 2623, EZ-1, EZ-2, EP-1, LNP-3, 663, 664 and 674;

- those belonging to the PEMULEN product series, such as TR1 and TR2;

- STRUCTURE 2001 and 3001, and

- ALCOGUM SL-70 and SL-78.

ACUSOL is a trademark of Rohm & Haas.

CARBOPOL and PEMULEN are trademarks of B. F. Goodrich.

POLYGEL and NEUTRAGEL are trademarks of Sigma 3V.

RHEOVIS is a trademark of Ciba Specialties.

STRUCTURE is a trademark of National Starch & Chemical Co.

ALCOGUM is a trademark of Alco.

In waterless scouring compositions, sufficient polymer suspending mixture is used so that the viscosity of the suspension prepared by diluting it with an equal amount of water is within the limits specified above. The amount is at least 0.1% and generally does not exceed 10%.

Combinations of surfactants and polymer suspending mixtures can also be used. In particular, the stability of suspensions based on surfactant suspending mixtures can be further enhanced by adding small amounts of additional thickening polymer to waterless scouring compositions.

The foaming surfactants used in a given case, if they were not included in the surfactant suspending mixture, can be selected from known foaming anionic, cationic, zwitterionic and amphoteric surfactants that do not have a detrimental effect on the suspending mixture.

The pH of the ready-to-use liquid abrasive cleaner should preferably be between 5 and 14. The cleaning properties are improved if the cleaner is alkaline, preferably above 9, more preferably below 12. The anhydrous abrasive composition should also contain a pH adjusting agent, for example a suitable base, if necessary, to adjust the pH of the liquid cleaner to the desired limits. Suitable bases include, for example, alkali metal hydroxides, alkali metal carbonates, ammonium carbonate, organic bases such as triethylamine, aminomethylpropanol (AMP), aminobutanol, mono-, di- and triethanolamine, monoisopropylamine and aminomethylpropanediol.

The waterless scouring compositions of the invention may also contain optional components which improve the cleaning properties of the compositions. Such components include, for example, solid bleaching agents, especially

- 17 halogen-containing bleaching agents. If bleaching agents are used, the other components of the anhydrous compositions - in particular the surfactants and the suspending mixture - must of course be stable to the bleaching agents. Optional components may also include, for example, organic solvents, such as hydrocarbons, terpenes, alkanolamines, polyethylene glycols and polypropylene glycols, as well as the (C1-C6 alkyl) ethers and phenyl ethers of these glycols. These solvents may be used in amounts that do not reduce the flowability of the particles of the anhydrous compositions. The amount of solvents is therefore generally below 6%.

The water-free compositions may also contain other optional components well known to those skilled in the art of liquid abrasive cleaning agents, such as: • components that make the product more attractive to consumers, such as colorants, optical brighteners and, above all, fragrances;

• components that prevent microbial contamination of the product or provide antimicrobial properties to the product, such as preservatives and bactericides;

• components that improve the product's handling, such as agents that ensure the flowability of the particles (coating agents used in amounts of less than 10%) that prevent the caking of anhydrous compositions (such as Ausil ET porous aluminosilicate sold by J. Crosfield and Solvay

- 18 Socal P2V), dispersants that facilitate the dispersion of anhydrous compositions in water and/or ensure freeze/thaw stability of the suspension produced (such as anionic polymers with a molecular weight of less than 100,000 daltons, STP and/or other organic or inorganic phosphates or phosphonates), and antifoaming agents that prevent excessive foaming (such as fatty acids).

It is particularly advantageous to use flow agents and dispersants as additional components.

The anhydrous compositions of the invention can be prepared in any form that is readily dispersible in water, such as powders, granules, or even tablets. The powders and granules should preferably be free-flowing. Spray drying, fluid bed drying, granulation, and other similar processes known in the art are well suited for producing products that are free-flowing particles and are readily dispersible without agglomeration. It may be useful to use a granulation aid, such as polyethylene glycol with a molecular weight of 1500-4000 daltons, for granulation.

Tablets can be prepared by compressing a specified amount of the above-mentioned products. The tablets may also contain a disintegrant to improve dispersibility in water. These disintegrants are well known as components of detergent tablets used in laundries and dishwashers.

Ready-to-use, abrasive liquid cleaner

- 19 two can be prepared by adding a suitable amount of water to the anhydrous composition. The water should generally be added in such an amount that the amount of solid abrasive in the liquid product is 10-65%, preferably 10-60%, more preferably 15-50%, and the viscosity of the product η ₂ ι is 0.4-3.0 Pa s, preferably 0.8-2.5 Pa s, more preferably 1.0-2.0 Pa s.

Preferred compositions

The composition of preferably usable anhydrous compositions comprising a surfactant-based suspending mixture is generally as follows:

Preferably applicable compositions Even more advantageous compositions Component 65-95% 70-90% Powdered abrasive 1.5-10% 2.0-8.0% Anionic sulfate or sulfonate surfactant 1.5-7.0% 2.0-6.0% Ethoxylated alcohol nonionic surfactant 1.0-10% 1.5-8.0% Alkaline pH adjusting agent, preferably comprising an alkali metal carbonate or alkali metal bicarbonate 0-2.0% 0.1-1.5% Fatty acid

The composition of preferably usable anhydrous compositions comprising a suspending mixture based on a polymeric thickener is generally as follows:

Preferably applicable compositions Even more advantageous compositions Component 85-99% 90-98% Powdered abrasive 0.1-2.0% 0.15-1.0% Anionic or nonionic foaming surfactant, preferably an amine oxide 0.1-2.0% 0.15-1.0% Anionic polymer thickener 0.2-5.0% 0.5-4% Alkaline pH adjusting agent, preferably an alkali metal hydroxide and/or an alkanolamine In the amount needed for 100% * Water

Examples

Example 1

We prepared a solid scrubbing composition containing a surfactant-based suspending mixture,

whose composition was the following: LAS acid 5.97 Lialet 111-5.5 1) 3.13 Omyacarb 30AV 2) 79.57 Sodium carbonate 7.22 Prifac 7901 3) 0.90 Acusol 823 4) 0.036 Fragrance 0.72 Proxel GXL 5) 0.028 Socal P2V 6) 1.00 Alusil 7) 0.75 Water 0.67

1) A non-ionic surfactant consisting of ethoxylated alcohol, marketed by Condea Chimica DAC.

2) Calcite sold by the Omya company, in which, according to the company, the average particle size is 30 microns.

3) Fatty acid mixture marketed by UniQuema.

4) Polyacrylate marketed by Rohm & Haas.

5) Preservative supplied by Zeneca Biocides 6) Freely available material supplied by Solvay.

7) Aluminosilicate sold by J. Crosfield.

Omycarb and sodium carbonate were heated in the beaker of a RotoJunior 10L high-speed mixer/granulator (Zanchetta & CSrl, Italy) until the temperature reached approximately 50 °C. Then, the LAS acid heated to 50 °C was added first and the acid was allowed to disperse throughout the solids mixture. After dispersion was complete, a mixture containing the nonionic surfactant, fatty acid, polymer and minor additives, but excluding the flow additive and fragrance, was added to the beaker. Both the LAS acid and the nonionic mixture were added slowly while the mixer was operating at 300 ^rpm . The addition of the liquids took approximately 2 minutes.

After the liquid addition was completed, the RotoJunior was continued to operate with the mixer and the chopper (1400 min ¹ ) switched on and the temperature was raised to 65 °C over a further 10 minutes. The mixer and chopper were then switched off and the RotoJunior was cooled with water for 20 minutes to cool the product. The mixer was switched on again for a few seconds every 5 minutes.

- 22 was turned on to mix the material. Then, the particle flow additive (Socal U2) was added and the material was removed from the device. Then, the fragrance was applied from a tin container outside the device with a spray gun.

Example 2

A solid scrubbing composition containing a suspending mixture based on a polymer thickener was prepared, the composition of which was as follows:

Calcite 95

Carbopol ETD 2623

1) 0.36 (C16-18 alkyl)dimethylamine oxide 0.42

AMP (2-amino-2-methyl-propan-l-ol)

NaOH

Fragrance

Water etc.

0.38

1.00

0.84 in the amount required for 100%

1) Polyacrylate marketed by A. B. F. Goodrich.

The mixing operation was carried out in a Kenwood Chef mixer using a K-shaped connector as described below:

1. We added the calcite to the mixing bowl.

2. The polymer powder was added and the materials were mixed for approximately 5 minutes. The mixing speed was set to low-medium to avoid powder loss. The remaining components were liquid. These were added using a pipette.

3. While stirring, add the pre-mixed water with approximately 1%

- 23 dispersed AMPs.

4. Sodium hydroxide was added as a 10% solution and the material was stirred for approximately 5 minutes.

5. The amine oxide was added.

6. The fragrance was added and the material was mixed for approximately 20 minutes until a sufficiently homogeneous mixture was obtained.

Claims (16)

- 24 Patent claims 1. Anhydrous solid abrasive compositions comprising a solid abrasive material, characterized in that they contain a suspending mixture which enables the compositions to form a stable suspension when mixed with a liquid material. 2. An aqueous scouring composition according to claim 1, characterized in that it contains at least 65% of solid abrasive material and at least 0.1% of suspending mixture. 3. Scrubbing compositions according to claim 2, characterized in that they contain at least 70% of abrasive material. 4. A scrubbing composition according to any one of claims 1-3, characterized in that it comprises a water-insoluble scrubbing agent. 5. Anhydrous scouring compositions according to any one of claims 1-5, characterized in that they contain a suspending mixture which enables the flow properties of the resulting suspensions after mixing the anhydrous composition with an equal amount of water to be as follows: - r|o = at least 2500 Pa s - _c = 2.5-25 and - η ₂ ι = at least 0.1 Pa-s. 6. Scrubbing compositions according to any one of claims 1-5, characterized in that they contain as a suspending mixture one or more surfactants which, when mixed with the liquid material, are capable of forming a lamellar micelle phase. - 25 to create. 7. Scrubbing compositions according to claim 6, characterized in that they contain an anionic surfactant and a nonionic surfactant as surfactants. 8. Scrubbing compositions according to any one of claims 1-5, characterized in that they contain a suspending mixture comprising one or more polymeric thickeners. 9. Scrubbing compositions according to any one of claims 1-8, characterized in that they contain at least 0.1% of a foaming surfactant. 10. Scrubbing compositions according to any one of claims 1-9, characterized in that they contain an additive and/or a dispersant ensuring the fluidity of the particles. 11. Scrubbing compositions according to any one of claims 1-10, characterized in that they are prepared by a treatment that ensures the fluidity and easy dispersibility of the particles. 12. Abrasive compositions according to claim 11, characterized in that the treatment is spray drying, fluid bed drying or granulation. 13. A method for producing liquid abrasive cleaning agents, characterized in that the anhydrous abrasive compositions according to any one of claims 1-12 are mixed with a liquid material. 14. The method according to claim 13, characterized in that a liquid material is used which contains at least 85% water. 15. The method of claim 13 or 14, wherein characterized in that the liquid material and the anhydrous abrasive composition are used in such a ratio that the resulting abrasive liquid cleaning agent contains 10-65% solid abrasive material. 16. The method according to any one of claims 13-15, characterized in that the liquid material is used in such an amount that the viscosity η2ΐ of the abrasive liquid cleaning agent is 0.4-3.0 Pa-s. Ycvjt OfiaGeL On behalf of UNILEVER PLC, the authorized representative: DANUBE Patent and Trademark Office Ltd. Tivadar