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
  • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
  • C11D3/0005—Other compounding ingredients characterised by their effect
  • C11D3/0094—High foaming compositions
• • 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
  • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
  • C11D1/02—Anionic compounds
  • C11D1/04—Carboxylic acids or salts thereof
• • 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
  • C11D13/00—Making of soap or soap solutions in general; Apparatus therefor
  • C11D13/14—Shaping
  • C11D13/20—Shaping in the form of small particles, e.g. powder or flakes
• • 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
  • C11D3/0005—Other compounding ingredients characterised by their effect
  • C11D3/0026—Low foaming or foam regulating compositions

Definitions

• the present invention is concerned with rinse-active foam control particles for inclusion in a detergent composition, i.e. foam control particles mainly active in the rinse-cycle of a laundry process, with a method for making such particles, and with detergent compositions containing such particles.
• suds-control during the washing cycle of a laundry process is important, so as to avoid negative interference with the action of the wash liquor upon the fabrics, it is also known that suds-control during the rinse cycle of a laundry process is desirable; Indeed, excessive foaming during the rinse cycle in a washing machine can cause foam spillage and damage to the machine, while in a handwash context, there is an advantage in lowering the foam production during rinsing, so as to shorten this step.
• Soaps of fatty acids have been used for such a rinse-active suds control function, and they have always been spray dried together with the rest of the detergent composition; However, there is a desire to reduce organic emissions during manufacturing of detergents, in particular during spray-drying.
• the present invention provides foam control fatty acid soap particles which are made separately from the rest of the spray-dried detergent composition, and a process to make them, not causing organic emissions.
• the present invention provides rinse-active foam-control particles for inclusion in a detergent composition in powder form, consisting essentially of a soap of fatty acids of which at least 80% contain from 16 to 18 carbon atoms, the geometric mean particle size of the particles being inferior to 1 mm, preferably inferior to 0.4 mm.
• the present invention also encompasses a process for making said foam-control agents, as well as high suds and low sud executions of detergent compositions containing said foam-control particles.
• the antifoam particles are the antifoam particles.
• the foam-control particles of the invention are mainly constituted of a soap of fatty acids of which at least 80% by weight contain from 16 to 18 carbon atoms; preferred fatty acids are tallow or tallow/coconut mixtures at a weight ratio of tallow to coconut not less than 70/30; particularly preferred is a 90/10 tallow/coconut mixture.
• Suitable cations which render the soap water soluble and/or dispersible include sodium, potassium, ammonium, monoethanolammonium, diethanolammonium, triethanolammonium, tetramethylammonium, etc. Sodium ions are preferred.
• the particles of the invention are further characterized by their particle size, which is such that the geometric mean particle size, which is the median of the cumulative weight distribution, should be less than 1 mm and preferably less than 0.4 mm.
• the individual particle size of a particle is meant as being the sum of the longest and the shortest dimension of the particle divided by two.
• the cumulative weight distribution of the particles can be conveniently measured by sieving with an air-fluidized sieve.
• the particles herein optionally include a free-flowing agent such as amorphous silica, at levels not exceeding 5% by weight of the particle.
• a free-flowing agent such as amorphous silica
• the process herein contains essentially the steps of drying a fatty acid soap slurry to a low moisture level, i.e. a moisture level not exceeding 9%, preferably not exceeding 5% by weight of the slurry, then pressing the slurry into noodles, and successively grinding the noodles to a fine powder with the particle size required herein.
• control of the moisture level is a particularly critical feature of the process herein, since successful grinding to the required particle size will not be possible without meeting the claimed moisture level.
• Drying of the soap slurry is preferably achieved under vacuum. Supplementary drying during the grinding process may be appropriate, and achieved for example in an air classifier.
• a typical method to measure the moisture level in the sopa slurry and/or the noodles is a solvent distillation method, using a Bidwell® apparatus.
• a detergent composition in powder form comprising a surface-active agent and foam control particles such as described above.
• Addition of the particles herein in detergent compositions can be achieved by e.g. dry-mixing.
• the amount of foam control particles is typically from 0.25 to 5% by weight of the composition, depending on the type of detergent composition involved.
• a wide range of surfactants can be used in the detergent compositions.
• anionic surfactants are particularly suitable herein, especially mixtures of sulphonate and sulphate surfactants in a weight ratio of from 5:1 to 1:2, preferably from 3:1 to 2:3, more preferably from 3:1 to 1:1.
• Preferred sulphonates include alkyl benzene sulphonates having from 9 to 15, especially 11 to 13 carbon atoms in the alkyl radical, and alpha-sulphonated methyl fatty acid esters in which the fatty acid is derived from a C12-C18 fatty source preferably from a C16-C18 fatty source.
• the cation is an alkali metal, preferably sodium.
• Preferred sulphate surfactants are alkyl sulphates having from 12 to 18 carbon atoms in the alkyl radical, optionally in admixture with ethoxy sulphates having from 10 to 20, preferably 10 to 16 carbon atoms in the alkyl radical and an average degree of ethoxylation of 1 to 6.
• alkyl sulphates herein are tallow alkyl sulphate, coconut alkyl sulphate, and C14 ⁇ 15 alkyl sulphates.
• the cation in each instance is again an alkali metal cation, preferably sodium.
• One class of nonionic surfactants useful in the present invention are condensates of ethylene oxide with a hydrophobic moiety to provide a surfactant having an average hydrophilic-lipophilic balance (HLB) in the range from 8 to 17, preferably from 9.5 to 13.5, more preferably from 10 to 12.5.
• HLB hydrophilic-lipophilic balance
• the hydrophobic (lipophilic) moiety may be aliphatic or aromatic in nature and the length of the polyoxyethylene group which is condensed with any particular hydrophobic group can be readily adjusted to yield a water-soluble compound having the desired degree of balance between hydrophilic and hydrophobic elements.
• Especially preferred nonionic surfactants of this type are the C9-C15 primary alcohol ethoxylates containing 3-8 moles of ethylene oxide per mole of alcohol, particularly the C14-C15 primary alcohols containing 6-8 moles of ethylene oxide per mole of alcohol and the C12-C14 primary alcohols containing 3-5 moles of ethylene oxide per mole of alcohol.
• Nonionic surfactants comprises alkyl polyglucoside compounds of general formula RO (C n H 2n O) t Z x wherein Z is a moiety derived from glucose; R is a saturated hydrophobic alkyl group that contains from 12 to 18 carbon atoms; t is from 0 to 10 and n is 2 or 3; x is from 1.3 to 4, the compounds including less than 10% unreacted fatty alcohol and less than 50% short chain alkyl polyglucosides.
• Compounds of this type and their use in detergent are disclosed in EP-B 0 070 077, 0 075 996 and 0 094 118.
• nonionic surfactants are poly hydroxy fatty acid amide surfactants of the formula R2 wherein R1 is H, C1 ⁇ 4 hydrocarbyl, 2-hydroxy ethyl, 2-hydroxy propyl or a mixture thereof, R2 is C5 ⁇ 31 hydrocarbyl, and Z is a polyhydroxyhydrocarbyl having a linear hydrocarbyl chain with at least 3 hydroxyls directly connected to the chain, or an alkoxylated derivative thereof.
• R1 is methyl
• R2 is a straight C11 ⁇ 15 alkyl or alkenyl chain such as coconut alkyl or mixtures thereof
• Z is derived from a reducing sugar such as glucose, fructose, maltose, lactose, in a reductive amination reaction.
• a further class of surfactants are the semi-polar surfactants such as amine oxides.
• Suitable amine oxides are selected from mono C8-C20, preferably C10-C14 N-alkyl or alkenyl amine oxides and propylene-1,3-diamine dioxides wherein the remaining N positions are substituted by methyl, hydroxyethyl or hydroxypropyl groups.
• amphoteric surfactants such as polyamine-based species.
• Cationic surfactants can also be used in the detergent compositions herein and suitable quaternary ammonium surfactants are selected from mono C8-C16, preferably C10-C14 N-alkyl or alkenyl ammonium surfactants wherein remaining N positions are substituted by methyl, hydroxyethyl or hydroxypropyl groups.
• the detergent compositions can comprise from 1%-70% by weight of surfactant, but usually the surfactant is present in the compositions herein an amount of from 1% to 30%, more preferably from 10-25% by weight.
• the detergent compositions herein preferably also contain a builder, which can be selected from phosphates, aluminosilicate ion exchangers (zeolites), and water-soluble monomeric or oligomeric carboxylate chelating agents such as citrates, succinates, oxydisuccinates, as well as mixtures of the above species.
• a builder which can be selected from phosphates, aluminosilicate ion exchangers (zeolites), and water-soluble monomeric or oligomeric carboxylate chelating agents such as citrates, succinates, oxydisuccinates, as well as mixtures of the above species.
• Suitable builder materials include alkali metal carbonates, bicarbonates and silicates, organic phosphonates, amino polyalkylene phosphonates and amino polycarboxylates, ethylene diamine tetraacetic acid and nitrilotriacetic acid.
• Other suitable water-soluble organic salts are the homo- or co-polymeric polycarboxylic acids or their salts in which the polycarboxylic acid comprises at least two carboxyl radicals separated from each other by not more than two carbon atoms. Polymers of this type are disclosed in GB-A-1,596,756. Examples of such salts are polyacrylates of MW 2000-5000 and their copolymers with maleic anhydride, such copolymers having a molecular weight of from 20,000 to 70,000, especially about 40,000.
• ingredients which typically form part of a detergent composition in powder form include filler salts such as sodium sulphates, bleaching agents, such as sodium perborate and percarbonate, bleach activators, anti redeposition agents such as carboxymethyl cellulase, enzymes, such as proteases, amylases, lipases, and cellulases, brighteners, fabric softening clays, perfumes, dyes, pigments.
• the detergent compositions herein can be of the "high-suds" type, and be designed for hand-wash or in upright washing machine utilization. In such executions, the level of foam control particles is typically from 2% to 5% by weight.
• compositions of the invention can also be of the "low-suds” type and thus be adapted for use in washing machines of all types; in this latter category, detergent compositions encompass “compact” executions, where the density is typically above 550g/litre of composition, and the level of filler salt is typically below 5% by weight of the composition.
• the level of foam-control particles is typically from 0.25% to 2%.
• a suds-controlling agent active in the wash cycle is typically included, in addition to the rinse-active foam-control agents of the invention.
• additional foam-control agents are preferably silicones.
• LAS sodium salt of linear dodecyl benzene sulfonate
• TAS sodium salt of tallow alcohol sulfate
• Nonionic fatty alcohol ( C14 - C15 ) ethoxylated with about 7 moles of ethylene oxide Copolymer
• AA/MA copolymer of acrylic acid and maleic acid
• CMC carboxymethylcellulose
• Na Phosphonate sodium salt of ethylenediamine tetramethylene phosphonic acid
• TAED tetra acetyl ethylene diamine

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Citations (5)

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• 1991
  • 1991-12-03 EP EP91203149A patent/EP0544944A1/fr not_active Withdrawn
• 1992
  • 1992-11-26 TR TR01133/92A patent/TR27153A/xx unknown
  • 1992-12-01 WO PCT/US1992/010390 patent/WO1993011216A1/fr active IP Right Grant
  • 1992-12-01 HU HU9401356A patent/HUT67495A/hu unknown
  • 1992-12-01 AT AT93900775T patent/ATE190644T1/de not_active IP Right Cessation
  • 1992-12-01 ES ES93900775T patent/ES2142859T3/es not_active Expired - Lifetime
  • 1992-12-01 AU AU32341/93A patent/AU3234193A/en not_active Abandoned
  • 1992-12-01 EP EP93900775A patent/EP0615540B1/fr not_active Expired - Lifetime
  • 1992-12-01 DE DE69230801T patent/DE69230801T2/de not_active Expired - Fee Related
  • 1992-12-01 CZ CZ941232A patent/CZ123294A3/cs unknown
  • 1992-12-01 SK SK639-94A patent/SK63994A3/sk unknown
  • 1992-12-01 CA CA002124790A patent/CA2124790C/fr not_active Expired - Fee Related
  • 1992-12-01 JP JP51032493A patent/JP3357053B2/ja not_active Expired - Fee Related
  • 1992-12-01 BR BR9206856A patent/BR9206856A/pt not_active IP Right Cessation
  • 1992-12-02 MA MA23016A patent/MA22726A1/fr unknown
  • 1992-12-02 MX MX9206959A patent/MX9206959A/es unknown
  • 1992-12-02 EG EG74492A patent/EG20160A/xx active
  • 1992-12-02 PH PH45369A patent/PH31575A/en unknown
  • 1992-12-03 CN CN92114881A patent/CN1040022C/zh not_active Expired - Lifetime
• 1994
  • 1994-05-31 FI FI942551A patent/FI942551A/fi unknown
  • 1994-06-02 NO NO942053A patent/NO942053L/no unknown

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