EP2630224B1 - Externally structured aqueous detergent liquid - Google Patents

Externally structured aqueous detergent liquid Download PDF

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Publication number
EP2630224B1
EP2630224B1 EP11767995.1A EP11767995A EP2630224B1 EP 2630224 B1 EP2630224 B1 EP 2630224B1 EP 11767995 A EP11767995 A EP 11767995A EP 2630224 B1 EP2630224 B1 EP 2630224B1
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EP
European Patent Office
Prior art keywords
citrus
pulped
composition according
surfactant
liquid
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EP11767995.1A
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German (de)
English (en)
French (fr)
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EP2630224A1 (en
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Michael Richard Baker
Lee James Brennan
Julian Peter Woodbury Clarke
Adam Jan Kowalski
Neil James Parry
Geraint Paul Roberts
David Serridge
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Unilever PLC
Unilever NV
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Unilever PLC
Unilever NV
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    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/38—Products with no well-defined composition, e.g. natural products
    • C11D3/386—Preparations containing enzymes, e.g. protease or amylase
    • C11D3/38627—Preparations containing enzymes, e.g. protease or amylase containing lipase
    • 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
    • C11D17/0008—Detergent materials or soaps characterised by their shape or physical properties aqueous liquid non soap compositions
    • C11D17/0026—Structured liquid compositions, e.g. liquid crystalline phases or network containing non-Newtonian phase
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/37—Polymers
    • C11D3/3703—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C11D3/3715—Polyesters or polycarbonates
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/37—Polymers
    • C11D3/3703—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C11D3/3723—Polyamines or polyalkyleneimines
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/38—Products with no well-defined composition, e.g. natural products
    • C11D3/382—Vegetable products, e.g. soya meal, wood flour, sawdust
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/38—Products with no well-defined composition, e.g. natural products
    • C11D3/386—Preparations containing enzymes, e.g. protease or amylase
    • C11D3/38645—Preparations containing enzymes, e.g. protease or amylase containing cellulase

Definitions

  • This invention relates to a structured aqueous detergent liquid composition
  • a structured aqueous detergent liquid composition comprising water, surfactant, external structurant and enzymes, the external structurant provides rheological modification to the composition and may also be used to suspend solid materials in the liquid.
  • the structurant can convey the idea of concentration by increasing low shear viscosity whilst allowing the composition to flow freely when poured.
  • Solid materials can be suspended in such liquids to further reinforce the concentration message, for example the liquid can be pearlised by inclusion if mica particles or titanium dioxide particles.
  • the external structurant should be capable of suspending these particles, working either alone, or in combination with another rheology modifying system.
  • External structurants are also useful for less concentrated aqueous cleaning liquids.
  • surfactant in excess of that required for detergency is often used for thickening and rheology modification. This is undesirable from an environmental standpoint, not only is more chemical sent to waste but frequently the excess surfactant causes the utilisation of more rinse water, which is a big issue when water is a scarce resource.
  • HCO hydrogenated castor oil
  • Thixcin® is sold under the trade name Thixcin® by Elementis.
  • HCO is derived from chemical modification of a plant extract. Then the HCO is converted into an external structurant by crystallising it in the liquid, or in part of the liquid. This crystallisation process may impose formulation constraints, especially when using high surfactant levels. HCO structured liquids are slightly cloudy, which is undesirable when visual cues are suspended in the liquid. We have found that HCO is liable to rapid decomposition in the presence of lipase enzyme. Thus, the desirable use of this enzyme, particularly for the use disclosed in WO09153184 has been found to be incompatible with this typical external structurant.
  • MFC microfibrous cellulose
  • MFC suffers from other disadvantages.
  • the first is that due to its very low incorporation levels it can fail to remain evenly dispersed through the liquid if air micro bubbles form and get trapped by the structuring network to buoy the MFC up.
  • a process designed to try to overcome this problem is disclosed in WO09135765A (Unilever). No enzymes are used.
  • the detergent formulator would prefer to avoid use of MFC due to these known processing constraints.
  • US patent application US2007/0197779 discloses a structurant consisting of bacterially produced MFC combined with significant levels of carboxy methylcellulose and xanthan gum as dispersion aids.
  • the MFC forms a 3-D network structure, which can suspend inert materials such as sand and nylon beads.
  • the xanthan gum part of the dispersant is not a desirable ingredient for many detergent liquids. It poses constraints for inclusion of enzymes that can decompose xanthan gum. Furthermore it can have an undesirable effect in combination with cleaning and soil release polymers.
  • Such polymers are proposed to be used at high concentrations in the detergent liquids described in WO09/153184 . Thus MFC is not a good choice for the external structuring of such detergent liquids with high levels of polymers.
  • MFC forms nanofibres in concentrated aqueous detergent liquids. Uncertainties exist in scientific understanding of the impacts of such fibres, and associated public perception. For this reason, and because of the other disadvantages of MFC outlined previously, the skilled worker desires to find a better substitute for the lipase vulnerable HCO than MFC appears to be.
  • a structured aqueous liquid detergent composition comprising:
  • the composition comprises 0.16 to 0.35 wt% pulped citrus fibre.
  • the external structurant is a pulped citrus fibre which has undergone a mechanical treatment comprising a step of high intensity mixing in water and which material has consequently absorbed at least 15 times its own dry weight of water, preferably at least 20 times its own weight, in order to swell it. It may be derived by an environmentally friendly process from a fruit processing waste stream. This makes it more sustainable than prior art external structurants. Furthermore, it requires no additional chemicals to aid its dispersal and it can be made as a structured premix to allow process flexibility.
  • Pulped citrus fibre is much less expensive to produce than bacterial cellulose because its processing is simpler and it may be made from a waste stream, e.g. from fruit juice production.
  • Citrus fruits are preferred as the source of the fibre because they have a large amount of peel that can provide material with the desired water absorbing capacity.
  • the most preferred fruits are lemons and limes lemon because the natural pH of the resulting mechanical pulp is about 3.5, which allows use of potassium sorbate at low levels as an effective preservative for the premix before it is dispersed into the detergent liquid.
  • the citrus fibre is mechanically pulped by processing it to make a premix preferably in combination with preservative. This is done by adding dried powdered citrus fibre to at least 15 times its own weight of water and dispersing it under very high shear to further break up the citrus fibres and to begin the process of hydration, or swelling.
  • the mechanically treated citrus fibre is left in contact with the water for sufficient time for it to swell due it being fully hydrated. This can be several hours.
  • pulped citrus fibre is kept separate from surfactant until it is fully swollen. This avoids the possibility for the surfactant to compete with the citrus pulp fibre for the water. Something that becomes more of a problem as the total surfactant concentration increases.
  • the amount of pulped citrus fibre in the premix is preferably from 1 to 5 wt%. More preferably from 2 to 4 wt%. Depending on the processing equipment used there may be a practical upper limit of from 3.3 to 3.5 wt% as it is advantageous that there is excess water in order to fully hydrate the pulped citrus fibre.
  • Pulped Citrus fibre has different in use pouring properties from other external structurants used in detergent compositions. It exhibits pronounced drainage on walls of a pack, a translucent appearance, and a slightly grainy texture on pouring. This gives a detergent liquid structured with pulped citrus fibre a different look and feel for the consumer. Such a difference is ideal to signal a major shift in liquid detergent composition; especially to a composition that requires lower usage and a change in consumer behaviour.
  • pulped citrus fibre does not significantly affect the foam generated by the presence of the surfactant system. This is an advantage for formulation flexibility.
  • At least one enzyme selected from lipase and cellulase is an essential feature of the detergent compositions of the invention.
  • Lipase is a preferred enzyme as is known to boost performance on certain types of stains and soil when used in compositions designed to provide low in solution surfactant levels.
  • suitable Lipases are Lipomax®, Lipex®, and Lipolase®.
  • Preferred lipase enzymes include those of bacterial or fungal origin. Chemically modified or protein engineered mutants are included. Examples of useful lipases include lipases from Humicola, including ones which comprise a polypeptide having an amino acid sequence which has at least 90% sequence identity with the wild-type lipase derived from Humicola lanuginosa, most preferably strain DSM 4109.
  • Cellulases may be included and if they are the formulation should preferably be formulated at a pH where their activity is low. Typically this is an alkaline pH, although mildly acidic conditions of down to pH 6.5 or even as low as pH 6.2 can be tolerated.
  • An advantage of pulped citrus fibre over bacterially derived microfibrous cellulose as an external structurant is that due to its lower cost and lower efficacy as a structurant the pulped citrus fibre is incorporated at much higher levels than MFC. This appears to confer the advantage of greater resistance to destabilisation of the structuring system due to attack from cellulase.
  • Pulped citrus fibre provides a stable external structuring network in the presence of endoglucanase, which enables addition of this cellulase to a structured aqueous liquid either on its own, or more preferably in combination with lipase.
  • Such a mix of enzymes is desirable for compositions that further comprise a soil release polymer to provide a multi wash benefit on a range of stain and fabric types.
  • Concentrated laundry detergent liquids may advantageously contain such a combination.
  • Cellulase improves the cleaning of cotton
  • lipase improves the cleaning of oily soils from cotton and polyester and soil release polymers further boost the multi-wash cleaning benefits of the detergent composition on these fabrics.
  • lipase helps remove greasy stains, especially if low surfactant levels are used.
  • Cellulases help to break down many other food residues.
  • the surfactant type is not limited. Synthetic detergents are preferred. Mixtures of synthetic anionic and nonionic surfactants, or wholly anionic surfactant system or admixtures of anionic surfactants with nonionic surfactants or with amphoteric or zwitterionic surfactants may be used. It is preferred for the composition to comprise anionic (non-soap) surfactant. Particularly preferred surfactant systems are mixtures of the anionic surfactants linear alkyl benzene sulphonate and sodium lauryl ether sulphate with the nonionic surfactant ethoxylated nonionic fatty alcohol. Betaines, such as sulphobetaine are advantageously used as a cosurfactant.
  • the amount of surfactant may range from 0.5 to 65 wt%, preferably 2.5 to 60 wt%, more preferably from 25 to 50 wt%.
  • the skilled worker will appreciate that the optimum surfactant concentration will largely depend on the product type and the intended mode of use.
  • the amount of external structurant is important. Because it is added to the remainder of the ingredients in admixture with around 20 times its weight of water, it is important to keep the amount of structurant to a minimum. Below 0.15 wt%, pulped citrus fibre fails to provide adequate structuring. The precise lower limit depends to some extent on the remainder of the composition; the skilled worker will know that the aim is to obtain a system in which the rheology exhibits a critical yield stress. To ensure adequate suspending duty it is preferred that the amount of pulped citrus fibre is at least 0.2 wt%.
  • the structured liquid is shear thinning. The preferred pouring viscosity being from 20 - 100 mPa.s and the yield stress or critical stress being about 0.3 Pa.
  • the composition may optionally comprise suspended solid material.
  • the solid material may be microcapsules such as perfume encapsulates, or care additives in encapsulated form. It may alternatively, or additionally, take the form of insoluble ingredients such as silicones, quaternary ammonium materials, insoluble polymers, insoluble optical brighteners and other known benefit agents found, for example, in EP1328616 .
  • the amount of suspended solid material may be from 0.001 to up to 10 or even 20 wt%.
  • a particular solid material to be suspended is a visual cue, for example the type of flat film cue described in EP13119706 . The cue may itself contain a segregated component of the composition.
  • the cue must be water-soluble, yet insoluble in the composition, it is conveniently made from a modified polyvinyl alcohol that is insoluble in the presence of anionic surfactant.
  • the detergent composition should comprise some anionic surfactant, preferably at least 5 wt% anionic surfactant.
  • a pulped citrus fibre structured detergent liquid comprising at least 0.15 wt% pulped citrus fibre structurant and at least 0.5 wt% surfactant, the process comprising the steps of:
  • the dispersal requires no addition of further dispersal aids to the premix formed in step (c).
  • a preservative is added to the premix during or after step (c), particularly if the premix will be stored for some time before addition to the detergent liquid.
  • compositions that are used neat, including laundry liquids used for pre-treatment and hard surface cleaning compositions of the type that are applied from a spray or pump are beneficially structured with this external structurant as it does not cause over foaming as they are applied and very low levels of surfactant can be structured.
  • the structurant is compatible with the inclusion of lipase for grease removal, especially in compositions that may be left on hard surfaces for grease removal purposes and other hard surface cleaning compositions.
  • the externally structured enzyme containing compositions are suitable for hand contact after dilution uses, such as hand dishwashing and hand laundry.
  • Laundry detergents are generally classified as low foam, used in automatic washing machines, and high foam, used in hand wash and top loading washing machines.
  • the pulped citrus fibre advantageously provides the necessary structuring without boosting foam in the low foaming compositions and yet retains adequate foam in high foaming compositions.
  • the level of pulped citrus fibre in the premix preferably lies in the range 1 to 2.5 wt%.
  • the amount of pulped citrus fibre preferably lies in the range of 0.15 wt% to 0.35 wt%.
  • the dispersed pulped citrus fibre is biodegradable, it is advantageous to include a preservative into the premix. In any case, a preservative is normally needed in the liquid detergent composition.
  • the process used leaves much of the natural cell wall intact while the sugars are removed.
  • the resulting highly swelling citrus fibre materials are typically used as food additives and have been used in low fat mayonnaise.
  • the pH of the dispersed powder is acidic which is ideal for use with a preservative such as potassium sorbate.
  • Microscopy shows that the powdered citrus fibre material as supplied it is a heterogeneous mixture of particles with various sizes and shapes.
  • the majority of the material consists of aggregated lumps of cell walls and cell wall debris.
  • a number of tube-like structures with an open diameter of about 10 micron that are often arranged in clusters, can be identified.
  • xylem vessels are water transport channels that are mainly located in the peel of citrus fruits.
  • the xylem vessels consists of stacks of dead cells, joined together to form long tubes, 200 to 300 micron long.
  • the outside of the tubes is reinforced by lignin, which is often laid down in rings or helices preventing the tubes from collapse due to the capillary forces acting on the tube walls during water transport.
  • the powdered citrus fibre material Before it can be used as an external structurant it is necessary to process the powdered citrus fibre material as supplied further to break down the tubes to be more space filling. This is done by dispersing it at a low concentration into water. As mentioned previously a preservative is usefully added at this stage. This high shear dispersal opens out the sponge structure to increase the phase volume. The shear should not be high enough to lead to defibrillation. If a high-pressure homogeniser is used it should be operated between 200 and 600 bar. The more shear that is applied the less dense the resulting particles. Whilst the morphology is changed by the high shear, process aggregate size appears not to be changed. At high pressure, the fibres break down and then fill the water phase. The very high shear also forms fibrils by rubbing loose the outer parts of the cell walls and these are able to form a matrix that structures the water outside of the volume of the original fibre.
  • a pulped citrus fibre structuring premix may alternatively be made using a high shear mixer, such as a Silverson.
  • a high shear mixer such as a Silverson.
  • One possible process passes the premix through several sequential high-shear mixing stages in order to ensure full hydration and dispersal of the citrus fibre to form the pulped citrus fibre dispersion.
  • the premix can then simply be added to a partially, or formed detergent liquid premix with the surfactant and other components of the liquid detergent composition already admixed.
  • Ingredients that would be held back at this stage are perfume, enzymes and any solid material that will be suspended by the external structurant. Such post-dosed materials are added later to the structured liquid, under low shear mixing conditions.
  • the structurant is typically dispersed at very high shear to break up the insoluble fibres and to increase phase volume of the structuring system by maximising break up and contact with anhydrous structuring material.
  • the premix may be left to hydrate further (age) after the high shear mixing.
  • the concentration of pulped citrus fibre in the pre-mix depends on the ability of the equipment to deal with the higher viscosity due to higher concentrations.
  • the minimum will preferably be at least 1 wt% for practical reasons.
  • Linear alkyl benzene sulphonate (LAS) used on its own is generally calcium intolerant.
  • surfactant systems should generally avoid having levels of LAS above 90 wt%.
  • Nonionic-free systems with 95 wt% LAS can be made if some zwitterionic surfactant, such as sulphobetaine, is present.
  • an advantage of the use of pulped citrus fibre over HCO is that it is not necessary to have high levels of nonionic surfactant in the composition.
  • Preferred alkyl ether sulphates are C8-C15 alkyl and have 1-10 moles of ethoxylation.
  • Preferred alkyl sulphates are alkylbenzene sulphonates, particularly linear alkylbenzene sulphonates having an alkyl chain length of C8-C15.
  • the counter ion for anionic surfactants is generally an alkali metal, typically sodium, although other counter-ions such as MEA, TEA or ammonium can be used. Suitable anionic surfactant materials are available as the 'Genapol'TM range from Clariant.
  • the composition contains from 0.2 wt% to 40 wt%, preferably 1 wt% to 20 wt%, more preferably 5 to 15 wt% of a non-ionic surfactant, such as alcohol ethoxylate, nonylphenol ethoxylate, alkylpolyglycoside, alkyldimethylamineoxide, ethoxylated fatty acid monoethanolamide, fatty acid monoethanolamide, polyhydroxy alkyl fatty acid amide, or N-acyl N-alkyl derivatives of glucosamine (“glucamides").
  • a non-ionic surfactant such as alcohol ethoxylate, nonylphenol ethoxylate, alkylpolyglycoside, alkyldimethylamineoxide, ethoxylated fatty acid monoethanolamide, fatty acid monoethanolamide, polyhydroxy alkyl fatty acid amide, or N-acyl N-alkyl derivatives of glucosamine (“glucamides”).
  • Preferred nonionic surfactants that may be used include the primary and secondary alcohol ethoxylates, especially the C8-C20 aliphatic alcohols ethoxylated with an average of from 1 to 35 moles of ethylene oxide per mole of alcohol, and more especially the C10-C15 primary and secondary aliphatic alcohols ethoxylated with an average of from 1 to 10 moles of ethylene oxide per mole of alcohol.
  • Polymeric thickening systems may be added to the liquid to increase the viscosity and further modify the rheology.
  • Pulped citrus fibre is especially compatible with such thickening systems and it is compatible with other external structurants.
  • one or more further enzymes may be present in a composition of the invention and when practicing a method of the invention.
  • Essential enzymes are lipase and/or cellulase, most preferably lipase.
  • Further enzymes may be selected from the enzymes known to be compatible with surfactant containing compositions, in particular proteases, mannanases and amylases.
  • Suitable lipases include those of bacterial or fungal origin. Chemically modified or protein engineered mutants are included. Examples of useful lipases include lipases from Humicola (synonym Thermomyces ), e.g. from H. lanuginosa ( T. lanuginosus ) as described in EP 258 068 and EP 305 216 or from H. insolens as described in WO 96/13580 , a Pseudomonas lipase, e.g. from P. alcaligenes or P. pseudoalcaligenes ( EP 218 272 ), P. cepacia ( EP 331 376 ), P. stutzeri ( GB 1,372,034 ), P.
  • lipase variants such as those described in WO 92/05249 , WO 94/01541 , EP 407 225 , EP 260 105 , WO 95/35381 , WO 96/00292 , WO 95/30744 , WO 94/25578 , WO 95/14783 , WO 95/22615 , WO 97/04079 and WO 97/07202 .
  • LipolaseTM and Lipolase UltraTM LipexTM and LipocleanTM (Novozymes A/S).
  • LipomaxTM a lyophilized lipase-preparation from pseudomonas alcaligenes (originally from Gist-brocades, more recently from the Genencor division of Danisco).
  • the presence of relatively high levels of calcium in poorly built or unbuilt wash liquors has a beneficial effect on the turnover of certain enzymes, particularly lipase enzymes and preferably lipases from Humicola.
  • Suitable cellulases include those of bacterial or fungal origin. Chemically modified or protein engineered mutants are included. Suitable cellulases include cellulases from the genera Bacillus, Pseudomonas, Humicola, Fusarium, Thielavia, Acremonium, e.g. the fungal cellulases produced from Humicola insolens, Thielavia terrestris, Myceliophthora thermophila, and Fusarium oxysporum disclosed in US 4,435,307 , US 5,648,263 , US 5,691,178 , US 5,776,757 , WO 89/09259 , WO 96/029397 , and WO 98/012307 .
  • Phospholipase may be classified as EC 3.1.1.4 and/or EC 3.1.1.32.
  • the term phospholipase is an enzyme that has activity towards phospholipids.
  • Phospholipids such as lecithin or phosphatidylcholine, consist of glycerol esterified with two fatty acids in an outer (sn-1) and the middle (sn-2) positions and esterified with phosphoric acid in the third position; the phosphoric acid, in turn, may be esterified to an amino-alcohol.
  • Phospholipases are enzymes that participate in the hydrolysis of phospholipids.
  • phospholipases A 1 and A 2 which hydrolyze one fatty acyl group (in the sn-1 and sn-2 position, respectively) to form lysophospholipid
  • lysophospholipase or phospholipase B
  • Phospholipase C and phospholipase D release diacyl glycerol or phosphatidic acid respectively.
  • Cutinase is classified in EC 3.1.1.74.
  • the cutinase may be of any origin.
  • Preferably cutinases are of microbial origin, in particular of bacterial, of fungal or of yeast origin.
  • alkaline pectate lyases examples include BIOPREPTM and SCOURZYMETM L from Novozymes A/S, Denmark.
  • JP-A-03047076 discloses a beta-mannanase derived from Bacillus sp.
  • JP-A-63056289 describes the production of an alkaline, thermostable beta-mannanase.
  • JP-A-63036775 relates to the Bacillus microorganism FERM P-8856 which produces beta-mannanase and beta-mannosidase.
  • JP-A-08051975 discloses alkaline beta-mannanases from alkalophilic Bacillus sp. AM-001.
  • a purified mannanase from Bacillus amyloliquefaciens is disclosed in WO 97/11164 .
  • WO 91/18974 describes a hemicellulase such as a glucanase, xylanase or mannanase active.
  • mannanases derived from Bacillus agaradhaerens, Bacillus licheniformis, Bacillus halodurans, Bacillus clausii, Bacillus sp., and Humicola insolens disclosed in WO 99/64619 .
  • Bacillus sp. mannanases used in the Examples of WO 99/64619 .
  • mannanases examples include MannawayTM available from Novozymes A/S Denmark.
  • Any enzyme present in the composition may be stabilized using conventional stabilizing agents, e.g., a polyol such as propylene glycol or glycerol, a sugar or sugar alcohol, lactic acid, boric acid, or a boric acid derivative, e.g., an aromatic borate ester, or a phenyl boronic acid derivative such as 4-formylphenyl boronic acid, and the composition may be formulated as described in e.g. WO 92/19709 and WO 92/19708 .
  • a polyol such as propylene glycol or glycerol
  • a sugar or sugar alcohol lactic acid, boric acid, or a boric acid derivative, e.g., an aromatic borate ester, or a phenyl boronic acid derivative such as 4-formylphenyl boronic acid
  • a preferred polymer is modified polyethylene imine PEI 600(20EO).
  • Soil release polymers, especially polyester soil release polymers may also be used.
  • the amount of polymers, when used, is preferably greater than 2 wt%, more preferably greater than 5 wt%, even greater than 10 wt%.
  • Anti-redeposition polymers such as sodium carboxymethyl cellulose may additionally be used.
  • Water-soluble builders may be included in the compositions of the invention.
  • compositions are aqueous but the need to keep high levels of surfactants and other water-soluble ingredients in solution may necessitate the presence of additional solvents or hydrotropes.
  • Preferred hydrotropes are propylene glycol, glycerol, glycerine and mixtures thereof. Hydrotropes, when used, are preferably present at levels of from 1 to 20 wt%.
  • the composition may further comprise MEA and / or TEA and/ or sodium hydroxide for alkalinity.
  • MEA and / or TEA and/ or sodium hydroxide for alkalinity may comprise citric acid.
  • Levels of citric acid preferably range from 0.5 to 5 wt%
  • Soluble fabric whitening agents may be included.
  • the use of the external structurant also makes it possible to use insoluble OBA but this is not preferred if it is desired that the liquid is clear (i.e. that it is possible to see through it).
  • Proxel is a preferred preservative for the liquid compositions. Potassium Sorbate is also preferred.
  • CPF pulped citrus fibre
  • the powdered Citrus fibre powder was added directly to the prepared detergent liquid and an attempt was made to disperse it using a Silverson high shear mixer. No structuring was formed. The particles of powdered material added did not swell and simply sank to the bottom of the liquid when shear was removed.
  • Premixes of 1 to 2.5 wt% pulped citrus fibre in water were prepared using high intensity mixing. We used a Silverson mixer located in a recycle loop around a batch vessel. The premixes formed were all homogeneous.
  • example 1 As an alternative to example 1 we used a high pressure homogeniser was used to supply the shear. Like example 1, a homogeneous well dispersed structured premix was obtained. The maximum premix concentration is limited by the maximum viscosity that the equipment is capable of handling.
  • the pulped citrus fibre premix made in Example 1 or Example 2 (1 or 2 wt% used) was added to a detergent liquid comprising 40 wt% Active detergent (LAS, SLES, NI 1:1:2) and 15 wt% propylene glycol hydrotrope, the balance being water. Two orders of addition were successfully used:
  • Part A Structurant pre-mix
  • a structurant pre-mix was prepared using 2% Herbacel plus AQ (type N) citrus fibre powder, 97.9% tap water and 0.1 % Potassium Sorbate preservative.
  • the pre-mix was prepared using a pilot plant scale Gaulin high pressure Homogeniser operating at 350 bar.
  • the resulting pulped citrus fibre (PCF) pre-mix was readily handleable and pumpable.
  • Part B Concentrated base detergent liquid
  • a concentrated base detergent liquid B having the composition shown in Table 1 (except for the 2 wt% PCF premix and the perfume) was prepared using a 50 litre capacity pilot plant vessel equipped with a mixing element of the 'Flexible Agitator System (FAS)' geometry. 12.5% of the water had been removed from the formulation to allow for post dosing of the 2% PCF pre-mix: Part A. The concentrated mixture was allowed to de-aerate for > 1 hr.
  • FAS 'Flexible Agitator System
  • Table 1 Composition of Structured liquid of Example 4 Material Activity Weight % Water 100 9.67 Glycerol 100 5.12 PPG 100 9.21 NaOH 47 5.87 TEA 100 3.32 NI 7EO 100 20.59 Citric acid 50 2.01 LAS acid 97.1 13.71 Prifac 5908 100 4.89 SLES 70 9.79 Dequest 2066 32 1.60 PCF 2 12.80 Perfume 100 1.42 TOTAL 100.00
  • the concentrated base detergent mixture B was circulated via a 150/250 Silverson high shear mill by means of a recycle loop to ensure all lines were fully primed and purged of air. Flow rate 1450 l/hr (single pass residence time in mill 0.1 seconds). The Silverson mill was turned on at 6250 rpm (9063 w/kg) to simulate large scale operating conditions. Then the structurant Pre-mix A was dosed into the main recirculation loop close to the high shear mixer inlet to minimise interaction between the streams prior to intimate dispersion. The perfume was then added using low shear mixing.
  • the pulped citrus fibre structured liquid was then sampled and its rheology measured. Again, after 1 week storage at ambient temperature, the rheology was remeasured and the samples were visually assessed to see if there was either top clear layer separation or bottom clear layer separation.
  • Lipase could be added to Example 4 and Example 5 liquids structured with PCF without loss of structuring.
  • Rheology was measured at 25°C using an Anton Paar ASC rheometer.
  • Figure 2 shows the rheology data after 24 hours. Comparative example B shows that when using Lipex in an HCO structured liquid there is complete loss of structuring within 24 hours at ambient temperature. In contrast, Lipex has no effect on the otherwise identical liquid structured with PCF, as in example 6.
  • Table 3 shows a range of heavy duty laundry detergent liquids that may be structured with pulped citrus fibre.
  • Examples 8, 9, 10 and 11 are so called 3 times concentrated laundry liquid suitable for use at approx 35 ml dose to a standard European front loading automatic washing machine.
  • Examples 12, 13, and 14 are compositions suitable for use at a 20 ml dose to the same type of machine.
  • Example 9 Example 10
  • Example 12 Example 13
  • Example 14 Material % as 100% % as 100% % as 100% % as 100% % as 100% % as 100% % as 100% % as 100% % as 100% LAS Acid 16.00 4.85 13.40 8.75 8.49 8.49 8.49 SLES 6.00 2.42 6.70 6.82 4.24 4.24 4.24 NI 7EO 2.00 7.28 20.12 4.58 12.74 12.74 12.74 Prifac 5908 0.85 4.78 3.00 1.50 1.50 3.03
  • Empigen BB 0.86 1.50 1.50 1.50
  • SRP 2.10 3.75 3.75 NaOH 1.61 0.07 2.70 0.07 0.07 MEA 7.00 TEA 2.75 2.00 3.23 2.50 3.50 3.50 11.00
  • Glycerol 5.00 Heptasodium DTPMP 0.50 0.88
  • Dequest 2010 1.50 2.62 Opacifier 0.10 Flu
  • Table 4 shows the rheology obtained by variants of Examples 12 and 14.
  • the composition examples 15 to 18 were tested as described above to obtain the rheology profiles shown in Figure 5 ; without yet adding in the enzyme. Based on the findings for the lack of effect of Lipase on similar compositions the addition of the Lipase would not affect the Rheology. Lipase and cellulase can be added without affecting the stability of the rheological profile over time.
  • These examples show that the rheology is usefully obtained with the inclusion of various levels of cleaning and soil release polymers, also the addition of high levels of polymer and the addition of relatively high levels of sequestrant. All of these ingredients might have had a detrimental effect on the rheology.
  • liquids in examples 19 to 26 can simply be reformulated to contain Lipase and/ or cellulase at levels of from 0.0001 to 5 wt%, preferably from 0.001 to 0.3 wt%.
  • the structuring rheology is not affected by such enzyme inclusion.

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BR112013009456B1 (pt) 2021-11-30
BR112013009456A2 (pt) 2021-03-09
WO2012052306A1 (en) 2012-04-26
ZA201302069B (en) 2014-05-28
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CL2013001087A1 (es) 2014-02-21

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