EP1358307A1 - Desintegrants et procede de fabrication de ceux-ci - Google Patents

Desintegrants et procede de fabrication de ceux-ci

Info

Publication number
EP1358307A1
EP1358307A1 EP02716182A EP02716182A EP1358307A1 EP 1358307 A1 EP1358307 A1 EP 1358307A1 EP 02716182 A EP02716182 A EP 02716182A EP 02716182 A EP02716182 A EP 02716182A EP 1358307 A1 EP1358307 A1 EP 1358307A1
Authority
EP
European Patent Office
Prior art keywords
water
composition
zeolite
composition according
weight
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02716182A
Other languages
German (de)
English (en)
Inventor
Abraham Araya
Mark Antony Woodhouse
Ian Charles Callaghan
Jelle Vincent Boskamp
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ineos Silicas Ltd
Original Assignee
Ineos Silicas Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ineos Silicas Ltd filed Critical Ineos Silicas Ltd
Publication of EP1358307A1 publication Critical patent/EP1358307A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
    • C11D17/0047—Detergents in the form of bars or tablets
    • C11D17/0065—Solid detergents containing builders
    • C11D17/0073—Tablets
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D11/00—Special methods for preparing compositions containing mixtures of detergents
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/02—Inorganic compounds ; Elemental compounds
    • C11D3/12—Water-insoluble compounds
    • C11D3/124—Silicon containing, e.g. silica, silex, quartz or glass beads
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/02—Inorganic compounds ; Elemental compounds
    • C11D3/12—Water-insoluble compounds
    • C11D3/124—Silicon containing, e.g. silica, silex, quartz or glass beads
    • C11D3/1246—Silicates, e.g. diatomaceous earth
    • C11D3/1253—Layer silicates, e.g. talcum, kaolin, clay, bentonite, smectite, montmorillonite, hectorite or attapulgite
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/02—Inorganic compounds ; Elemental compounds
    • C11D3/12—Water-insoluble compounds
    • C11D3/124—Silicon containing, e.g. silica, silex, quartz or glass beads
    • C11D3/1246—Silicates, e.g. diatomaceous earth
    • C11D3/128—Aluminium silicates, e.g. zeolites

Definitions

  • This invention relates to disintegrants useful in solid dosage forms and, in particular, in compositions intended to be formed into moulded bodies for use in, for example, home care products, personal care products, food, agricultural, industrial and pharmaceutical applications.
  • disintegrants useful in solid dosage forms and, in particular, in compositions intended to be formed into moulded bodies for use in, for example, home care products, personal care products, food, agricultural, industrial and pharmaceutical applications.
  • One particular use for disintegrants is in detergent compositions in the form of tablets which have been widely described and are currently enjoying increasing popularity with consumers. They are described, for example, in GB 0 911 204 (Unilever), US 3 953 350 (Kao), DE 19 637 606 (Henkel), EP 0 711 827 (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
  • Tablets of cleaning compositions are generally made by compression or compaction of a quantity of a 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.
  • 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 poiyvinyl pyrrolidones, gelatines and formaldehyde casein as well as a wide variety of clay minerals and certain ion-exchange resins.
  • WO 98/55583 (Unilever) claims use of such material at a particle dimension of at least 400 ⁇ m to give more efficient disintegration.
  • WO 98/55575 (Henkel) teaches the use of cellulose disintegrating aids with a particle size of less than 100 ⁇ m, in order to minimise deposition. This material is co-granulated with 'microcrystalline cellulose and/or one or several ingredients of detergents and cleaning agents'. Despite these attempts to provide satisfactory tablet disintegration with minimal deposition, there is still a need for an improved composition, particularly for one that retains good dispersion properties on storage.
  • the process and the disintegrant of this invention can be used in a number of applications where tablets are used and, in particular, it has been surprisingly found that a detergent tablet which disintegrates readily and retains its easy disintegration on storage can be produced by incorporating into the composition used to produce the tablet a co-granule according to an aspect of this invention.
  • a process for the preparation of a disintegrant, suitable for use in a composition in the form of a moulded body comprises forming by a dry granulation process a granular composition comprising a swelling clay and a water insoluble inorganic material.
  • a process for the preparation of a disintegrant, suitable for use in a composition in the form of a moulded body comprises forming by a dry granulation process a granular composition comprising a swelling clay, a water insoluble inorganic material and a water-swellable agent which, in its anhydrous state, comprises no more than 20 per cent of the combined weight of said swelling clay, said water insoluble material and said water-swellable agent.
  • composition suitable for use as a disintegrant in a composition in the form of a moulded body said composition being in the form of granules comprising a swelling clay, a water insoluble inorganic material and a water- swellable agent which, in its anhydrous state, comprises no more than 20 per cent of the combined weight of said swelling clay, said water insoluble inorganic material and said water- swellable agent.
  • a water-swellable agent is co-granulated with a swelling clay and a water insoluble inorganic material before being incorporated into a moulded body, particularly in the form of a tablet, then the water-swellable agent is much more efficient in aiding disintegration of the body in use than when it is not co-granulated.
  • less of the water- swellable agent needs to be added for effective disintegration.
  • the disintegrant is used in tablets for cleaning materials this effect lowers the probability of deposition of the water-swellable agent on the substrate being cleaned.
  • tablets prepared using the granulates according to this invention disintegrate in use readily even after being stored for some time.
  • the present invention seeks to provide a disintegrant which is useful in a particulate 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 process for which it is intended.
  • the water-swellable agent preferably comprises, in its anhydrous state, no more than 15 per cent, more preferably no more than 10 per cent, of the combined weight of said swelling clay, said water insoluble inorganic material and said agent in the granular disintegrant.
  • the water-swellable agent comprises, in its anhydrous state, no more than 8 per cent, e.g.
  • a feature of the preferred aspect of this invention is the relatively small amount of water-swellable agent that may be employed while securing satisfactory properties for a compacted composition, particularly a cleaning composition.
  • the amount of water- swellable agent in a cleaning composition containing the disintegrants of the invention is less than 2 per cent by weight.
  • the amount is less than 1 per cent by weight of a cleaning composition but usually at least 0.2 per cent by weight of the water-swellable agent is present in a cleaning composition.
  • a number of clays are known as swelling clays and particularly suitable swelling clays for use in this invention include smectite clays.
  • smectite is used to geologically classify certain three-layer swelling clays.
  • swelling as used herein relates to the ability of the layered clay structure to swell, or expand, on contact with water. Clays having a smaller particle size are preferred in detergent applications since they give fewer problems with residues on a substrate that has been washed.
  • smectite clays There are two distinct classes of smectite clays. In the first class, aluminium oxide is present in the silicate crystal lattice; in the second class, magnesium oxide is present in the silicate crystal lattice.
  • the general formulas of these smectites are AI 2 (Si 2 ⁇ 5 ) 2 (OH) 2 and Mg 3 (Si 2 0 5 )(OH) 2 for the aluminium and magnesium oxide type clay, respectively.
  • the range of the water of hydration can vary with the processing to which the clay has been subjected. Such processing does not significantly affect the swelling characteristics of the hydrated clays as this is dictated by the silicate lattice structure.
  • atom substitution by iron and magnesium can occur within the crystal lattice of the smectites, while metal cations such as Na + , Ca 2+ , as well as H + , can be co-present in the water of hydration to provide electrical neutrality.
  • the three-layer, swelling aluminosilicate clays useful herein are further characterised by a dioctahedral crystal lattice, while the swelling three-layer magnesium silicate clays have a trioctahedral crystal lattice.
  • the clays employed in the invention can contain cationic counterions such as protons, sodium ions, potassium ions, calcium ions and magnesium ions. It is customary to distinguish between clays on the basis of one cation predominantly or exclusively absorbed. For example, a sodium clay is one in which the absorbed cation is predominantly sodium. Such absorbed cations can become involved in exchange reactions with cations present in aqueous solutions.
  • the smectite clays used in the present invention are commercially available. Such clays include, for example, montmorillonite, hectorite, saponite, volchonskoite, nontronite and sauconite. Such clays are available under commercial names such as Bentonite L, H and MB, all from SCP, USA, and the trade name VOLCLAY from American Colloid Co. Some commercially available clays are produced by treating naturally-occurring clays, for example, by treating calcium bentonite (a form of montmorillonite) with a compound of sodium and/or with other cations.
  • montmorillonite hectorite
  • saponite volchonskoite
  • nontronite nontronite
  • sauconite Such clays are available under commercial names such as Bentonite L, H and MB, all from SCP, USA, and the trade name VOLCLAY from American Colloid Co.
  • Some commercially available clays are produced by treating naturally-occurring clays, for
  • a preferred bentonite clay for use in this invention is a calcium bentonite clay which has been treated with sodium carbonate and which is sold under the trade names "Brebent” and "Fulgel” by Laporte pic. Other suitable clays are available commercially.
  • the smectite minerals obtained under these commercial and trade names can comprise mixtures of the various discrete mineral entities. Such mixtures of the smectite minerals are suitable for use in the invention.
  • smectite clays While any of the smectite clays above are useful herein, certain clays are preferred. Smectite clays of a neutral or white colour are preferred when formulating white, or neutral granular compositions.
  • the "Brebent” and “Fulgel” clays which are particularly useful in this invention have a weight mean particle size between 5 and 25 ⁇ m, as determined by Malvern Mastersizer (Trade Mark) using the method described hereinafter. These clays contain relatively high levels of sodium, but are derived from calcium clays. Clays similar to this, which are suitable for the invention, have a sodium content less than about 4 per cent by weight, expressed as Na 2 0 and, typically, a calcium content less than 1.5 per cent by weight, expressed as CaO.
  • the granules prepared according to the invention comprise a water insoluble inorganic material.
  • water insoluble is used to describe a compound with a solubility of less than 5 g per 100 g water at 25° C, preferably having a solubility of less than 1 g per 100g water at 25° C.
  • Suitable water insoluble inorganic materials include silica, aluminosilicates, aluminas, calcium carbonate, barium sulphate, titanium dioxide and pigments.
  • Preferred water insoluble inorganic materials are silica, materials consisting of at least 70 per cent silica by weight and aluminosilicates.
  • the water insoluble inorganic materials have a weight mean particle size below 10 ⁇ m and, more preferably, the weight mean particle size is below 5 ⁇ m, as measured using a Malvern Mastersizer (Trade Mark) using the method described hereinafter.
  • zeolites particularly useful insoluble inorganic materials are crystalline aluminosilicates, usually zeolites, particularly zeolites of use in a detergent formulation.
  • useful zeolites include zeolite P, A or X or mixtures thereof, with zeolite P being preferred.
  • the empirical formula of a zeolite is
  • M 2/n O • Al 2 0 3 • xSi0 2 • yH 2 0
  • M represents a metallic cation having a valency of n
  • x indicates the ratio of atoms of silicon to atoms of aluminium
  • y indicates the ratio of molecules of water to atoms of aluminium.
  • M is an alkali metal.
  • Zeolites of use in this invention may have the structure of any of the known zeolites.
  • the structure and characteristics of many zeolites are described in the standard work "Zeolite Molecular Sieves" by Donald W. Breck, published by Robert E. Krieger Publishing Company.
  • x in the above empirical formula is in the range 1.5 to 10.
  • Zeolites useful in this invention may be based on naturally-occurring or synthetic aluminosilicates and the preferred forms of zeolite have the structure known as zeolite P, zeolite A or zeolite X.
  • Particularly preferred forms of zeolite are those disclosed in EP-A-0 384 070, EP-A-0 565 364, EP-A-0 697 010, EP-A-0 742 780, WO-A-96/14270, WO-A-96/34828 and WO-A-97/06102, the entire contents of which are incorporated herein by this reference.
  • the zeolite P described in EP-A-0 384 070 has the empirical formula given above in which M represents an alkali metal and x has a value up to 2.66, preferably in the range 1.8 to 2.66, and has a structure which is particularly useful in the present invention.
  • granular disintegrants of this invention are more effective when zeolites used to prepare them contain relatively little water.
  • the preferred amount of water in a zeolite used to prepare the granules depends upon the type of zeolite.
  • a particularly useful form of zeolite P contains less than about 16 per cent water by weight and, preferably, from about 9 to about 12 per cent water by weight.
  • the relative amounts of swelling clay and crystalline aluminosilicate in the granular disintegrant is preferably from 9 : 1 to 1 : 9 by weight clay : aluminosilicate and more preferably from 6 : 1 to 1 : 5 by weight clay : aluminosilicate Good results have been obtained with ratios in the range 1.5 : 1 to 1 : 3 by weight clay to inorganic mate ⁇ al.
  • the swelling clay is preferably present in the granular disintegrant in an amount in the range 20 to less than 50 per cent by weight, preferably in the range 25 to 45 per cent by weight of the granular disintegrant.
  • the water insoluble inorganic material is preferably present in an amount in the range 35 to 70 per cent by weight of the granular disintegrant, more preferably in the range 45 to 65 per cent by weight and frequently is present in the range 50 to 60 per cent by weight of the granular disintegrant.
  • Alkali metal aluminosilicates especially zeolites, are commonly used in detergent compositions as a detergency builder. Where cleaning compositions prepared using the disintegrants of the invention contain an alkali metal aluminosilicate as detergency builder, at least part of the aluminosilicate constituent of the cleaning composition will be provided by the disintegrant granules.
  • the water-swellable agent preferably has an average primary particle size up to about 600 ⁇ m, but, conveniently, has an average primary particle size of no more than 200 ⁇ m, preferably no more than 100 ⁇ m, and a water swelling capacity of at least 5 cm 3 /g, preferably at least 10 cm 3 /g and more preferably at least 20 cm 3 /g as determined in the test described hereinafter.
  • the water-swellable agent comprises a 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.
  • a 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.
  • Aquasorb A500 ex Hercules
  • Ac-Di-Sol (ex FMC Corp)
  • Nilyn XL-90 ex FMC Corp.
  • the granules of swelling clay and water insoluble inorganic material and, in the preferred embodiment, water-swellable agent are prepared by a dry granulation process.
  • a typical known process for producing granules of inorganic material comprises mixing the inorganic material with water or an aqueous liquid, agitating the wet mixture until granules are formed and subsequently removing water from the granules.
  • the dry granulation process of the current invention the granules are produced without the use of water or an aqueous liquid.
  • the dry granulation process can be any of the processes that will be known to those skilled in the art, e.g. by blending the dry ingredients in a mixer followed by compacting on a roller compactor.
  • Suitable mixers include high shear mixers such as a Pek mixer available from George Tweedy & Co of Preston - 28lb S.A. Machine, a Henschel mixer available from Thyssen Henschel Industrietechnik, Kassel, Germany and a Lodige mixer available from Gebr. Lodige grabau, Paderbom, Germany, as well as low/medium shear mixers such as the orbiting screw Nautamixer available from Vrieco-Nauta, Holland or a ribbon mixer as supplied, for example, by Morton, Motherwell, Scotland.
  • high shear mixers such as a Pek mixer available from George Tweedy & Co of Preston - 28lb S.A. Machine, a Henschel mixer available from Thyssen Henschel Industrietechnik, Kassel, Germany and a Lodige mixer available from Gebr. Lodige bau, Paderbom, Germany, as well as low/medium shear mixers such as the orbiting screw Nautamixer
  • Suitable roller compactors include the Alexanderwerk WP50 manufactured by Alexanderwerk AG, Remscheid, Germany, the IR520 Chilsonator available from Fitzpatrick Company, Elmshurst, Illinois, USA and a roller compactor from Hosokawa Bepex of Minneapolis, USA.
  • a typical small-scale preparative method in which the product granule comprises swelling clay, crystalline aluminosilicate and a water-swellable agent is now described in detail.
  • Swelling clay and aluminosilicate and water-swellable agent particulates are blended together, in the appropriate proportions, in a Pek mixer for 30 minutes.
  • a minimum of 2 kg of blended material 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 500 to 3000 ⁇ m, using standard laboratory sieves.
  • the particles Preferably, the particles have a size range of 700 to 1500 ⁇ m.
  • the granules, however produced comprise an intimate mixture of particles of swelling clay, crystalline aluminosilicate and water-swellable agent.
  • the moulded body which can be formed using the disintegrants produced according to the current invention can be a body useful in any application where a rapid disintegration is desired when the body is mixed with an aqueous liquid.
  • Such applications include compositions intended to be used, for example, in agricultural sprays, in an industrial or process waste stream and in a body of water such as a lake or swimming pool.
  • the moulded body may also comprise a foodstuff or a pharmaceutical, including a veterinary product.
  • Particularly preferred moulded bodies are those used as cleaning compositions in home or personal care.
  • a moulded body formed from a cleaning composition using the disintegrants 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 containing a disintegrant prepared in accordance with the invention.
  • 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 may also contain, in addition to the disintegrants of the invention, 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, amphoteric and zwitterionic detergent-active compounds, and mixtures thereof and/or other conventional additives.
  • one or more detergency builders wholly or partly incorporated in the disintegrant granules
  • detergent-active compounds which may be chosen from soap and non-soap anionic, cationic, nonionic, amphoteric and zwitterionic detergent-active compounds, and mixtures thereof and/or other conventional additives.
  • cleaning compositions prepared using the disintegrants prepared according to the invention will contain from 1 to 20 per cent by weight of the disintegrant granules based on total weight of the composition. Frequently the cleaning compositions will contain from 4 to 10 per cent by weight of the disintegrant granules.
  • a suitable type of cleaning composition for use in most automatic fabric washing machines contains both anionic and nonionic surfactants.
  • Cleaning compositions 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.
  • 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.
  • the skilled detergent worker will have no difficulty in applying the normal principles to choose a suitable bleach system.
  • compositions using the disintegrants prepared according to 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.
  • Detergent 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 g, 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 about 45 mm and a height of about 20 mm.
  • Tablets prepared had strength values in the range 25 to 32 kPa (as determined by the Diametrical Fracture Stress test described below) which are typical values for commercial fabric washing tablets found in the Western European market in 1999-2000.
  • the method measures the strength of a detergent tablet using a Zwick Universal
  • the exact dimensions of the tablet to be tested are measured using callipers and the tablet is placed between the platens of the Zwick Universal Testing Machine so that the machine will apply a force along the diameter of the tablet.
  • the force required to break the tablet is then recorded using the following machine settings: 50 kN measuring head and platens. Hard stops positioned at 375 mm and 1500 mm. LE position 48 mm (or adjusted appropriately if measured diameter of tablet differs from 45 mm).
  • 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.
  • 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.
  • the weight mean particle size of the materials used in this invention is determined using a Malvern Mastersizer model X, with a lens range up to 300 mm RF and MS17 sample presentation unit.
  • This instrument made by Malvern Instruments, Malvern, Worcestershire, uses the principle of Mie scattering, utilising a low power He/Ne laser. Before measurement the sample is dispersed ultrasonically in water for 7 minutes to form an aqueous suspension. This suspension is stirred before it is subjected to the measurement procedure outlined in the instruction manual for the instrument, utilising the 300 mm RF lens range in the detector system.
  • the Malvern Mastersizer measures the weight particle size distribution of the inorganic material or reference material. The weight mean particle size (d 50 ) or 50 percentile is readily obtained from the data generated by the instrument.
  • Disintegration profiles were investigated for a number of detergent tablet formulations, all based on a standard detergent base powder having the following composition.
  • composition is representative of a typical composition used in a European detergent formulation for tablet detergents, but without minor additives, such as perfume.
  • Ingredient % by weight is representative of a typical composition used in a European detergent formulation for tablet detergents, but without minor additives, such as perfume.
  • Zeolite 1 (anhydrous) 27.60
  • the detergent powder was blended with 10 per cent by weight amounts of disintegrant granules having different compositions.
  • the disintegrant granules comprised a water insoluble inorganic material, in the form of a zeolite, a swelling clay and a water-swellable agent.
  • Doucil A24 is a P-type zeolite sold by INEOS Silicas Limited of Warrington, UK; Doucil 4A (Trade Mark) is a 4A zeolite obtainable from INEOS Silicas Limited; Brebent is a sodium enriched calcium-form bentonite available from Laporte pic and the water-swellable agent was Ac-Di-Sol, a croscarmellulose sodium available from FMC Corporation, Philadelphia USA.
  • Table 1 a granule (Granule F) was prepared using only a zeolite and a swelling polymer. All these granules were prepared using a Pek mixer and Alexanderwerk roller compactor as hereinbefore described. Each was classified by sieving to a size range of 500 to 1200 ⁇ m.
  • Tablets 1 A to 1 F contain 10% by weight of granules A to F respectively, the other 90% being formed from the base detergent powder mentioned above.
  • Table 2 shows the level of disintegration after immersion in water for these tablets using the experimental protocol described above in Method 2.
  • the measurement of disintegration shows the level of disintegration obtained by subtracting the percentage of undisintegrated residue retained in the 'cage' from 100.
  • Detergent tablets were prepared in a similar manner to that described in Example 1 using granules having the compositions given in Table 3. The granules were classified to a size range of 500 to 1200 ⁇ m.
  • Tablets 2G to 21 contain 5% by weight of granules G to I respectively, the other 95% being formed from a mixture of the base detergent powder mentioned above and sodium acetate (15% by weight of the tablet).
  • the sodium acetate used was 99% by weight sodium acetate trihydrate and 1 % by weight zeolite, Doucil A24.
  • Table 4 shows the level of disintegration after immersion in water for these tablets using the experimental protocol described above in Method 2.
  • the measurement of disintegration shows the level of disintegration obtained by subtracting the percentage of undisintegrated residue retained in the 'cage' from 100.
  • Tablets were prepared according to the method of Example 2 using Granule C and Granule F.
  • Tablet 3C contained 15% by weight sodium acetate (as in Example 2) and Tablet 3F contained 20% sodium acetate.
  • the disintegration results are shown in Table 5 below.
  • Example 4 Granules were prepared using a Pek mixer and Alexanderwerk roller compactor as hereinbefore described. Each was classified by sieving to a size range of 500 to 1200 ⁇ m. Granule J was prepared using Doucil A24 and Granule K was prepared using Doucil 4A, a zeolite A available from INEOS Silicas Ltd., Warrington, UK. Each contained 50% by weight zeolite and 50% by weight Brebent clay. Tablets were prepared according to the method of Example 2 using these granules and containing 10% by weight sodium acetate (as in Example 2). The disintegration results are shown in Table 6 below.
  • Example 4 was repeated except that the granules were incorporated in the tablets at 5% by weight and the amount of sodium acetate (as in Example 2) used in the tablets was 15% by weight.
  • the disintegration results are shown in Table 7 below.

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Abstract

L'invention concerne un procédé de fabrication d'un désintégrant conçu pour être utilisé dans une composition sous forme d'un corps moulé. Ce procédé consiste à former à l'aide d'un procédé de granulation par voie sèche une composition granulaire comprenant une argile gonflante et un matériau inorganique insoluble dans l'eau. De préférence, cette composition granulaire comprend également un matériau capable de gonfler dans l'eau. L'invention concerne également une composition conçue pour être utilisée en tant que désintégrant dans une composition sous forme d'un corps moulé, ladite composition étant sous forme de granules comprenant une argile gonflante, un matériau inorganique insoluble dans l'eau et un agent capable de gonfler dans l'eau. Dans son état anhydre, cette composition ne contient pas plus de 20 % du poids combiné de ladite argile gonflante, dudit matériau inorganique insoluble dans l'eau et dudit agent capable de gonfler dans l'eau.
EP02716182A 2001-02-05 2002-01-29 Desintegrants et procede de fabrication de ceux-ci Withdrawn EP1358307A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB0102736A GB0102736D0 (en) 2001-02-05 2001-02-05 Disintegrants and a process for their manufacture
GB0102736 2001-02-05
PCT/GB2002/000367 WO2002062933A1 (fr) 2001-02-05 2002-01-29 Desintegrants et procede de fabrication de ceux-ci

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EP1358307A1 true EP1358307A1 (fr) 2003-11-05

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Publication number Priority date Publication date Assignee Title
ATE310797T1 (de) * 2002-09-16 2005-12-15 Unilever Nv Reinigungs- oder waschmittelzusammensetzungen

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DE3702764A1 (de) * 1987-01-30 1988-08-11 Degussa Waschmittelbuilder
DE3702968A1 (de) * 1987-02-02 1988-08-11 Henkel Kgaa Weichmachendes waschmittel
DE3931871A1 (de) * 1989-09-23 1991-04-04 Henkel Kgaa Granulares, phosphatfreies wasserenthaertungsmittel
DE4009618A1 (de) * 1990-03-26 1991-10-02 Henkel Kgaa Spruehgetrocknetes, avivierend wirkendes waschmitteladditiv
WO1995033038A1 (fr) * 1994-06-01 1995-12-07 The Procter & Gamble Company Sarcosinate a adoucissants argileux dans des compositions de blanchissage
TW520990B (en) * 1997-09-29 2003-02-21 Kao Corp Disintegrating particles and cleanser or detergent composition
DE59800410D1 (de) * 1998-11-11 2001-02-01 Dalli Werke Waesche & Koerperp Verdichtetes Granulat, Herstellungsverfahren und Verwendung als Sprengmittel für gepresste Formkörper
ATE201714T1 (de) * 1999-03-29 2001-06-15 Dalli Werke Waesche & Koerperp Sprengmittelgranulat enthaltende waschmitteltabletten
DE19943237A1 (de) * 1999-09-11 2001-05-17 Clariant Gmbh Cogranulate aus Alkalischichtsilikaten und Sprengmitteln
DE19953503A1 (de) * 1999-11-06 2001-05-10 Henkel Kgaa Verfahren zur Herstellung von Duftperlen

Non-Patent Citations (1)

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Title
See references of WO02062933A1 *

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GB0102736D0 (en) 2001-03-21

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