CLEANING COMPOSITIONS

Abstract: A cleaning composition formed into moulded bodies for use in for example fabric washing, dishware washing, stain removal and water softening incorporates disintegrant granules comprising a water insoluble inorganic material and a water-swellable agent which, in its anhydrous state, comprises no more than 20 % of the combined weight of said inorganic material.

Description: CLEANING COMPOSITIONS This invention relates to cleaning compositions and, in particular, particulate cleaning compositions to be formed into moulded bodies for use in, for example, fabric washing, dishware washing, stain removal and water softening Detergent compositions in the form of tablets are widely described and are currently enjoying increasing popularity with consumers They are described, for example, in GB 0 91 1 204 (Unilever), US 3 953 350 (Kao), DE 19 637 606 (Henkel), EP 0 71 1 827 (Unilever) and WO 98/40463 (Henkel) Tablets for machine dishwashing applications are described in, for example, WO 96/28530 (P&G) Tabletted detergents and cleaning compositions have several advantages over powdered or liquid compositions they are easier to dispense and handle, do not require measuring to obtain the correct dose and, being compact, are more economical to store and transport Tablets of cleaning compositions are generally made by compression or compaction of a quantity of the composition in the form of particles Production of tablets which are sufficiently hard and strong to withstand storage and handling requires a relatively high pressure to be used in this compaction process It is then necessary that, despite this compaction, the tablets are able to disperse and dissolve rapidly when added to wash water One approach to achieving good dispersion of the tablet is to include in the tablet a particulate insoluble but water-swellable agent These particles then swell with ingress of water, leading to stresses in the tablet and thence to break-up of the tablet Thus WO 98/55583 (Unilever) describes the use of 'water-insoluble, water-swellable polymeric material' which 'promotes disintegration of the tablets in water' Typical swelling agents which have been disclosed as possible tablet disintegrating agents are starches, cellulose and cellulose derivatives, alginates, dextrans, cross-linked polyvinyl pyrrohdones, gelatines and formaldehyde casein as well as a wide variety of clay minerals and certain ion-exchange resins These water swelling agents have no function in fabric washing except to aid tablet disintegration Furthermore, because they are insoluble and of relatively large particle size, they tend to deposit on clothes during the wash (see, for example, WO 98/55575 (Henkel) and WO 98/55582) As a result, several attempts have been made to minimise the deposition of these dismtegrants, for example by combining such a water-swellable, insoluble disintegrant with a second, highly soluble disintegrating aid - see WO 98/55582 (Unilever) Other attempts have included use of a preferred particle size of the disintegrant Thus, for example, WO 98/55583 (Unilever) claims use of such material at a particle dimension of at least 400 μm to give more efficient disintegration On the other hand, WO 98/55575 (Henkel) teaches the use of cellulose disintegrating aids with a particle size of less than 100 μm, in order to minimise deposition This material is co-granulated with 'microcrystalline cellulose and/or one or several ingredients of detergents and cleaning agents' Surprisingly, we have now found that if a water-swellable disintegrating aid is co- granulated with an insoluble or sparingly soluble, hydrophi c solid before being incorporated into a tablet, then the disintegrant is much more efficient in disintegrating the tablet in use Thus, less of the disintegrating aid needs to be added for effective disintegration, lowering the probability of deposition of the disintegrating aid on the substrate being cleaned The present invention seeks to provide a particulate cleaning composition in the form of a moulded body and which is relatively inexpensive to manufacture and sufficiently robust to withstand handling during production and packaging processes but readily breaks up and dissolves when contacted with an aqueous medium during the cleaning process for which it is intended without resulting in undue deposition on the substrate being cleaned According to the present invention there is provided a cleaning composition, the composition including disintegrant in the form of granules comprising a water insoluble inorganic material and a water-swellable agent which, in its anhydrous state, comprises no more than 20% of the combined weight of said inorganic material and said agent of the granular disintegrant, the granules being combined with the active ingredients of the cleaning composition in a compacted moulded body According to a particular aspect of the invention, a granular composition suitable for use in a cleaning composition consists essentially of a water insoluble inorganic material and a water-swellable agent which, in its anhydrous state, comprises no more than 20% of the combined weight of said inorganic mateπal and said agent of the granular composition By "water insoluble", we mean a compound with a water solubility of less than 5 grams, preferably less than 1 gram, per 100 grams water (at a temperature of 25°C) Preferably, the water-swellable agent comprises, in its anhydrous state, no more than 15%, more preferably no more than 10%, of the combined weight of said inorganic material and said agent of the granular disintegrant In a typical composition of the invention, the water- swellable agent comprises, in its anhydrous state, no more than 8%, e g 7 5% or less, of the combined weight of said inorganic material and said agent Generally, at least 1 % of the combined weight of the water-swellable agent and the inorganic material in the granules comprises water-swellable agent A feature of the invention is the relatively small amount of water-swellable agent that may be employed while securing satisfactory properties for the compacted cleaning composition Frequently, the amount of water-swellable agent in the cleaning composition is less than 2% by weight Preferably, the amount is less than 1 % of the cleaning composition but, usually, at least 0 2% of the water-swellable agent is present in the cleaning composition In one embodiment of the invention the inorganic material used in the formation of the disintegrant granules comprises a silica In a second embodiment of the invention the inorganic material used in the formation of the disintegrant granules conveniently comprises a material which acts as a functional ingredient of the cleaning composition In this instance, the inorganic material may be an aluminosilicate such as zeolite P, A or X or mixtures thereof, with zeolite P being preferred Alkali metal aluminosilicates, especially zeolites, are commonly used in detergent compositions as a detergency builder Where a cleaning composition of the invention is one containing an alkali metal aluminosilicate as detergency builder, preferably at least part of the aluminosilicate constituent of the cleaning composition is employed as the inorganic material used in the formation of the disintegrant granules For instance, the aluminosilicate constituent typically comprises about 10 to about 60% by weight of the cleaning composition and preferably, when zeolite is used in the disintegrant granules and as a detergency builder, then at least 1 % of the detergent composition comprises a zeolite constituent employed in the form of disintegrant granules The water-swellable agent preferably has an average primary particle size up to about 600 μm, but, conveniently, has an average primary particle size of no more than 200 μm, preferably no more than 100 μm, and a water swelling capacity of at least 5 ml/gram, preferably 10 ml/gram and more preferably 20 ml/gram as determined in the test described hereinafter Typically the water-swellable agent comprises polymer, frequently a wholly or partially cross-linked polymer, e g natural cellulose, cross-linked cellulose, (sodium) carboxy- methyl cellulose, cross-linked sodium carboxymethyl cellulose, pre-gelatinised starch, cross linked starch, or cross linked polyvinyl pyrrolidone Currently preferred are Aquasorb A500 (ex Hercules) and Ac-Di-Sol (ex FMC Corp) The moulded body formed using the cleaning composition of the present invention may consist wholly of the cleaning composition or alternatively the moulded body may comprise a number of discrete portions, at least one of which comprises a cleaning composition in accordance with the invention In this event, the remaining portion or portions of the moulded body may be constituted by at least one other ingredient, usually one suitable for use in detergent and cleaning applications such as fabric washing, dishware washing, stain removal and water softening Cleaning compositions of the invention may also contain, as essential ingredients, one or more detergency builders (wholly or partly incorporated in the disintegrant granules), and/or one or more detergent-active compounds which may be chosen from soap and non-soap anionic, cationic, nonionic, amphoteπc and zwitteπonic detergent-active compounds, and mixtures thereof and/or other conventional additives A further aspect of the invention comprises a process for the preparation of a cleaning composition comprising forming a granular disintegrant composition consisting essentially of a water insoluble inorganic material and a water-swellable agent which, in its anhydrous state, comprises no more than 20% of the combined weight of said inorganic material and said agent of the granular composition and mixing said granular composition with one or more detergent-active compounds and, optionally, with one or more detergency builders Alkali metal aluminosilicates are favoured as environmentally acceptable water- insoluble builders, e g zeolites A, X and P or mixtures thereof Other inorganic detergency builders include layered sodium silicate as described in US-A-4 664 839 and marketed by Hoechst as SKS-6, and alkali metal (generally sodium) carbonate Water-soluble phosphorous containing detergency building compounds such as alkali metal orthophosphates, metaphosphates, pyrophosphates and polyphosphates may be used Also possible are organic detergency builders such as polycarboxylate polymers, e g polyacrylates, acrylic/maleic polymers, and acrylic phosphonates, monomeπc polycarboxylates, e g , gluconates, oxydisuccmates, glycerol mono- di- and tπsuccinates, carboxymethyloxysuccinates, carboxy- methyloxymalonates, dipicolinates and hydroxyethyiiminodiacetates Many suitable detergent-active compounds are available and are fully described in the literature, for example, in "Surface-Active Agents and Detergents", Volumes I and II, by Schwartz, Perry and Berch The preferred detergent-active compounds that can be used are soaps and synthetic non-soap anionic and nonionic compounds Anionic surfactants are well known to those skilled in the art. Examples include alkylbenzene sulphonates, particularly sodium linear alkylbenzene sulphonates having an alkyl chain length of C 8 - C 15 , primary and secondary alkyl sulphates, particularly sodium C 8 - C 15 primary alcohol sulphates, olefin sulphonates; alkane sulphonates; dialkyl sulphosuccmates; and fatty acid ester sulphonates Nonionic surfactants that may be used include the primary and secondary alcohol ethoxylates, and ethoxylates of esteπfied fatty acids, especially the C 9 - C 15 primary and secondary alcohols ethoxylated with an average of from 3 to 20 moles of ethylene oxide per mole of alcohol. The choice of surfactant, and the amount present, will depend on the intended use of the detergent composition. For example, for machine dishwashing a relatively low level of a low- foaming nonionic surfactant is generally preferred In fabric washing compositions, different surfactant systems may be chosen, as is well known by the skilled detergent formulator, for handwashing products and for machine washing products The total amount of surfactant present will of course depend on the intended end use and may be as low as 0 5% by weight of the total composition, for example, in a machine dishwashing composition, or as high as 60% by weight of the total composition, for example, in a composition for washing fabrics by hand For fabric washing compositions in general, an amount of from 5 to 40% by weight of the total composition is generally appropriate Generally, cleaning compositions of the invention will contain from 1 to 20% by weight of the disintegrant granules based on total weight of the composition Frequently the cleaning compositions will contain from 4 to 10 % by weight of the disintegrant granules A suitable type of cleaning composition suitable for use in most automatic fabric washing machines contains both anionic and nonionic surfactants Cleaning compositions according to the invention may also suitably contain a bleach system Machine dishwashing compositions may suitably contain a chlorine bleach, while fabric washing compositions may contain peroxy bleach compounds, for example, inorganic persalts or organic peroxyacids, which may be employed in conjunction with activators to improve bleaching action at low wash temperatures Again, the skilled detergent worker will have no difficulty in applying the normal principles to choose a suitable bleach system Other materials that may be present in detergent compositions of the invention include sodium silicate, fluorescers, antiredeposition agents, inorganic salts such as sodium sulphate, enzymes, lather control agents or lather boosters as appropriate, pigments, and perfumes This list is not intended to be exhaustive Procedures and Tests Granule Production The granules of inorganic material and swelling agent may be prepared by any of the methods that will be known to those skilled in the art, e g by blending the dry ingredients in a mixer (such as a Pek mixer available from George Tweedy & Co of Preston - 28lb S.A Machine) and compacting on a roller compactor (Alexanderwerk WP50 - manufactured by Alexanderwerk AG, D 5630 Remscheid 1 , Germany) A typical preparative method is now described in detail with reference to silica as the inorganic material Silica and water swelling organic particulate are blended together, in the appropriate proportions, in a Pek mixer for 30 minutes. A minimum of 2 kg of blended mateπal so prepared is compacted by feeding into an Alexanderwerk roller compactor, fitted with a sintered block vacuum deaeration system The roller pressure setting is selected according to the strength of granule desired, higher pressures leading to stronger granules. Generally, roller pressure is between 8 and 25 MPa and a typical roller pressure is 10 MPa The compacted material from the compactor is fed into a granulator, which forms part of the machine, and forced through a mesh and the resulting granules are then screened to the desired particle size range, e g an average particle size of 250 to 1500 μm, using standard laboratory sieves Preferably, the particles have a size range of 500 to 1200 μm Tablet Production Tablets used in the Examples that follow were produced using a 45 mm diameter die set (stainless steel) in conjunction with a Universal Testing Machine Type No Z030 from Zwick GmbH, Ulm, Germany A known quantity, 40-45 grams, of the cleaning composition which comprised the compositions mentioned in the Examples below was placed in the die, the die plunger was inserted and the assembly was placed between the platens of the Zwick machine which was operated to apply a predetermined pressure to produce a tablet having a defined density and, in particular, a dimensionally stable and fracture resistant tablet Tablets thus produced were cylindrical in shape, with a diameter of 45 mm and a height of about 20 mm Tablets with different densities were produced in order to determine the tablet disintegration and conductivity profiles Tablets prepared had densities in the range 1250-1450 kg/m 3 , which are typical values for commercial fabric washing tablets found in the Western European market in 1998-9 Determination of tablet disintegration profile Method 1 (Dynamic) The tablet disintegration profile provides an indication of the extent to which various tablets (e g different compositions, different densities) disintegrate under the defined conditions 4500 g of demineralised water at 20°C were added to a 5 litre vessel fitted with pH, conductivity and temperature probes and maintained at a constant temperature of 20°C by immersion in a water bath The tablets to be tested were inserted into a metal cage having the dimensions 9 cm x 4 7 cm x 2 7 cm and having 16 apertures (each about 2 mm square) per cm 2 The metal cage was attached to the shaft of an overhead stirrer (Heidolph/Janke and Kunkel stirrer) to allow it and its contents to be rotated while immersed in the demineralised water Prior to testing, the empty cage was immersed in the demineralised water and rotated at 80 rpm for a short period of time until the temperature of the demineralised water as detected by the temperature probe had stabilised at 20 ± 0 2°C At this time, the conductivity, pH and temperature values registered by the respective probes were recorded The stirrer was then switched off to allow the cage to be raised out of the water so that a pre-weighed detergent tablet to be investigated could be inserted into the cage The cage was then re-immersed in the demineralised water together with the inserted tablet and the stirrer was switched on to resume rotation of the container at 80 rpm Measurements of conductivity and pH, initially at 15 second intervals for one minute and thereafter at one minute intervals, were made over a period of 10 minutes after which time the cage was raised out of the demineralised water to allow the residue of the tablet to be removed. The residue was then dried in an oven at 105°C so that the dry weight of the residue could be calculated as a percentage of the original tablet weight This procedure was repeated for a number of tablets having different compositions and different densities Method 2 (Static) 4500g of tap water at 20° C were added to a 5 litre vessel, which was maintained at 20° C by immersion in a water bath The tablets to be tested were weighed and inserted into a metal cage 20 cm in diameter with 1 cm 2 perforations The cage was lowered into the 5 litre vessel and left for 60 seconds The cage was then removed from the water, residue of the tablets was placed on an aluminium tray, dried for 24 hrs at 105° C and weighed to determine the percentage which had not disintegrated Determination of Tablet Conductivity Profile The tablet conductivity profile provides an indication of the extent to which various tablets (e g different compositions, different densities) dissolve under the defined conditions Conductivity measurements were obtained from the conductivity probe mentioned in Method 1 above at the same time as the tablet disintegration was measured Measurements of conductivity and pH were taken, initially at 30 second intervals for ten minutes and thereafter at one minute intervals for a further 20 minutes or until the conductivity measurements were observed to have reached a plateau corresponding to substantially total dissolution of the soluble portion of the tablet, i e equilibration of the tablet with water This procedure was repeated for a number of tablets having different compositions and different densities Determination of water swelling capacity of water-swellable agent To demonstrate the water swelling capacity of the water-swellable agent, 19 6 g of the agent was blended with 0 4 g of ultramarine pigment and compressed into a tablet using a laboratory tablet press at about 250 Mpa to give a tablet 32 mm in diameter This was crushed and sieved to give granules 500-1000 μm in size A glass tube, 33 mm in internal diameter and about 30 cm long with a sintered porous glass disc (porosity 1 ) fitted at one end was immersed upright, with said one end lowermost, in a large beaker of water (at 25° C) so that the water level rose to about 14 cm above the sintered glass 1 g of granules was added to the tube and allowed to settle onto the sintered glass disc With this arrangement water has access to the granules from both above and below The granules immediately began to swell, forming a jellylike mass The ultramarine pigment imparted a blue colour to the mass making it easy to see the top and to record its height The height of the swelling mass was recorded at intervals and showed an initial rapid rise followed by a levelling off after about 20-30 minutes From the diameter of the tube, the volume of the swollen mass can be calculated The result was expressed as ml/g water-swellable agent after 20 minutes EXAMPLE 1 Conductivity and disintegration profiles were investigated for a number of tablet formulations and densities, all based on concentrated Persil (Registered Trade Mark) original non-Biological detergent powder as manufactured by Lever Brothers of Kmgston-upon- Thames, UK - formulation as sold in the UK The detergent powder was blended with different amounts of disintegrant granules In each instance, the disintegrant granules comprised a water insoluble inorganic material, specifically a zeolite or a silica or a combination thereof, and a water-swellable agent For comparative purposes, granules consisting of Persil powder alone or comprising a water-swellable agent or a mixture of a water soluble material, specifically sodium silicate or sodium carbonate, and a water-swellable material were also prepared and tested In the Examples given below, Doucil A24 (Trade Mark) is a P-type zeolite sold by Crosfield Limited of Warrington, UK, SD2255 is a silica also obtainable from Crosfield Limited, Doucil 4A (Trade Mark) is a 4A zeolite obtainable from Crosfield Limited, the sodium disilicate is obtainable from Crosfield Limited under the trade mark Pyramid 95, the sodium carbonate is obtainable from Solvay Chemicals Limited (identified in their product literature as Soda Ash (Sodium Carbonate) Light Rheinberg), and the water-swellable agent was sodium carboxymethylcellulose as sold under the trade mark Aquasorb A500 by Hercules Limited of Salford, UK TABLE 1 NM = Not measured In Table 1 , APS represents average particle size (d 50 ) as measured using a Malvern Mastersizer (Trade Mark) obtainable from Malvern instruments in the UK and the values marked * are taken from typical data for the product or from specifications supplied by the manufacturer. The Soda Ash used in the Examples had a bulk density of 0 53 kg/dm 3 and was found to have a particle size distribution (by sieve analysis) as follows > 1000 μm = 1wt % 500 - 1000 μm = 0 5 wt % 250 - 500 μm = 3.5 wt % 75 - 250 μm = 74.5wt % 0 - 75 μm = 20.5wt % The different formulations of the disintegrant granules (on a by weight basis) are given in Table 2 TABLE 2 The granules coded G and H contain inorganic materials which are water soluble and as such are not within the scope of the present invention These particular Examples are included for comparative purposes A series of tablets were prepared at a standard density of 1325 ±10kg/m 3 Tablets 1A to 1 H contain 2% by weight of granules A to H respectively, the other 98% being formed from concentrated Persil original non-Biological detergent powder Tablet 1J was fabricated entirely from the same Persil powder Tablets 1K and 1L were prepared from the same Persil powder, but incorporated 0 2% and 2% by weight of Aquasorb A500 powder respectively Table 3 shows the level of disintegration and the conductivity obtained after 10 minutes immersion in water for these tablets using the experimental protocol described above in Method 1 The conductivity measurements are representative of the degree of dissolution of the soluble ionic constituents of the Persil detergent powder, the higher the conductivity value the greater the degree of tablet dissolution The measurement of disintegration shows the level of undismtegrated residue retained in the 'cage' Thus a high value indicates a poorly disintegrating tablet TABLE 3 The data clearly demonstrate the following 1 ) The Tablet U, composed entirely of concentrated Persil powder, does not disintegrate or dissolve well, after 10 minutes it is only about 50% disintegrated 2) Addition of 0 2% Aquasorb A500 (Tablet 1 K) has no appreciable effect (this is equivalent to the amount of Aquasorb added via granule incorporation in Tablets 1 A to 1 D, 1 G and 1 H) 3) Addition of more Aquasorb in Tablet 1 L (equivalent to the total weight addition of granules in Tablets 1A-1 H) appears to suppress disintegration and dissolution 4) Tablets 1A-1 D are essentially fully disintegrated/dissolved after 10 minutes 5) In contrast, when the Aquasorb has been co-granulated with a soluble material (Tablets 1G, 1 H), the disintegration and dissolution is far less effective In the case of silicate, the granules actually appear to retard disintegration relative to Tablet 1 J 6) Even when the level of Aquasorb in the granules is reduced to 7 5% or 5% (Tablets 1 E, 1 F, respectively) disintegration of the tablets is very well advanced after 10 minutes EXAMPLE 2 Table 4 below shows data for Tablets 2E, 2F equivalent to the data in Table 3 These tablets which are similar to the tablets used in Example 1 but contain granules E and F respectively, incorporated into tablets at 4% by weight instead of 2% The test method for measuring disintegration was Method 1 Again, it is clear that, by increasing the weight of granule in the tablet at these lower levels of Aquasorb inclusion, the excellent disintegrating properties of the granules can be retained without the need to significantly increase the total weight of disintegrating polymer in the tablet (since 4% inclusion of granule F corresponds to 2% of granule D in terms of the total weight of Aquasorb introduced into the granule) TABLE 4 EXAMPLE 3 Table 5 below shows further data for disintegration/conductivity (using disintegration Method 1 ) for tablets containing various of the granules, again incorporated into the tablets at 2% by weight These tablets are identified as 3X, where the X is the letter corresponding to the granule identity in Table 2 In this case, the tablets have been prepared at a higher density (1350 ± 10 kg/m 3 ) At this higher density, it is possible to discriminate between the performance of the different granules A to D From this data, it appears that the zeolite-containing granules are preferred over the silica-containing variant, with the granules prepared from Doucil A24 being the best performing disintegrating agents TABLE 5 EXAMPLE 4 A number of tablets were prepared using a standard detergent base powder, similar to concentrated Persil powder, but without minor additives, such as perfume Tablets containing disintegrant granules as shown in Table 6 below were prepared at a nominal density of 1250 kg/m 3 with 5% by weight of granules in the final detergent composition The disintegrant granules used were all based on the zeolite P, Doucil A24, which consisted of 90% aluminosilicate and 10% water by weight TABLE 6 1 Ac-Dι-Sol is a croscarmellulose sodium available from FMC Corporation, Philadelphia USA 2 Cellulose powder BFT is a granulated sulphite cellulose available from Vendico Chemical AB, Malmo, Sweden 3 Natιonal 78-1551 is a pre-gelatinised starch available from National Starch & Chemical, Manchester, UK "Arbocel FT40 is a fibrous natural cellulose available from J Rettenmaier & Sohne, Rosenberg, Germany The disintegration of the tablets was measured using Method 2, described hereinbefore, and the results are given in Table 7 below TABLE 7 In general, the amount of residue found using Method 2 is larger than that found using Method 1 , but the results still clearly demonstrate that the tablets containing disintegrant granules disintegrate to a much larger extent than tablets containing no granules

Claims: CLAIMS 1 A cleaning composition, the composition including disintegrant in the form of granules comprising a water insoluble inorganic material and a water-swellable agent which, in its anhydrous state, comprises no more than 20% of the combined weight of said inorganic material and said agent of the granular disintegrant, the granules being combined with the active ingredients of the cleaning composition in a compacted moulded body 2 A cleaning composition in which the water-swellable agent comprises, in its anhydrous state, no more than 15% of the combined weight of said inorganic material and said agent of the granular disintegrant 3 A cleaning composition in which the water-swellable agent comprises, in its anhydrous state, no more than 10% of the combined weight of said inorganic material and said agent of the granular disintegrant A cleaning composition in which the water-swellable agent comprises, in its anhydrous state, no more than 8% of the combined weight of said inorganic material and said agent of the granular disintegrant A cleaning composition in which the water-swellable agent comprises, in its anhydrous state, at least 1 % of the combined weight of said inorganic material and said agent of the granular disintegrant A cleaning composition as claimed in any one of the preceding claims in which the inorganic material comprises a silica A cleaning composition as claimed in any one of the preceding claims in which the inorganic material acts as functional ingredient of the cleaning composition A cleaning composition as claimed in any one of the preceding claims in which the inorganic material comprises an aluminosilicate A cleaning composition as claimed in Claim 8 in which the inorganic material comprises a zeolite 10 A cleaning composition as claimed in Claim 9 in which the inorganic material comprises a zeolite P 1 1 A cleaning composition as claimed in any one of Claims 7 to 10 in which the inorganic material comprises from about 10% to about 60% by weight of the cleaning composition 12 A cleaning composition as claimed in Claim 1 1 in which the cleaning composition contains at least 1 % by weight of the inorganic material embodied in the form of disintegrant granules 3 A cleaning composition as claimed in any of the preceding claims in which the water- swellable agent has an average primary particle size of no more than 200 μm A cleaning composition as claimed in any one of the preceding claims in which the water- swellable agent has a water swelling capacity of at least 5 ml/gram A cleaning composition as claimed in any one of the preceding claims in which the water- swellable agent is selected from the group consisting of cellulose, cross-linked cellulose, carboxymethyl cellulose, sodium carboxymethyl cellulose, cross-linked sodium carboxy- methyl cellulose pre-gelatinised starch cross-linked starch and cross-linked polyvmyl pyrrolidone A cleaning composition as claimed in any one of the preceding claims in which the moulded body consists entirely of said cleaning composition A cleaning composition as claimed in any one of Claims 1 to 15 in which only part of the moulded body is constituted by said cleaning composition, the remainder of the moulded body being constituted by at least one other ingredient for use in detergent and cleaning applications such as fabric washing, dishware washing, stain removal and water softening A cleaning composition as claimed in any one of the preceding claims in which the amount of water-swellable agent is less than 2% by weight of the cleaning composition A cleaning composition as claimed in any one of the preceding claims in which the granular disintegrant is present in an amount in the range 1 to 20% by weight of the total cleaning composition A granular composition suitable for use in a cleaning composition consisting essentially of a water insoluble inorganic material and a water-swellable agent which, in its anhydrous state, comprises no more than 20% of the combined weight of said inorganic mateπal and said agent of the granular composition A process for the preparation of a cleaning composition comprising forming a granular disintegrant composition consisting essentially of a water insoluble inorganic material and a water-swellable agent which, in its anhydrous state, comprises no more than 20% of the combined weight of said inorganic material and said agent of the granular composition and mixing said granular composition with one or more detergent-active compounds and, optionally, with one or more detergency builders A process as claimed in claim 21 in which the detergent-active compound is a soap, a synthetic non-soap anionic compound or a synthetic non-soap nonionic compound

Inventors: FREANEY MICHAEL DAMIAN, KREISCHER PIETER HUBERTUS, WOODHOUSE MARK ANTONY, FREANEY, MICHAEL, DAMIAN, KREISCHER, PIETER, HUBERTUS, WOODHOUSE, MARK, ANTONY
Applicants: CROSFIELD JOSEPH & SONS, FREANEY MICHAEL DAMIAN, KREISCHER PIETER HUBERTUS, WOODHOUSE MARK ANTONY, CROSFIELD LIMITED, FREANEY, MICHAEL, DAMIAN, KREISCHER, PIETER, HUBERTUS, WOODHOUSE, MARK, ANTONY
Application year: 2000
Main classification: C11D17
IPC codes: C11D17