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
  • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
  • C11D1/02—Anionic compounds
  • C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
  • C11D1/14—Sulfonic acids or sulfuric acid esters; Salts thereof derived from aliphatic hydrocarbons or mono-alcohols
  • C11D1/146—Sulfuric acid esters
• • 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
  • C11D1/66—Non-ionic compounds
  • C11D1/83—Mixtures of non-ionic with anionic compounds
• • 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
  • C11D1/66—Non-ionic compounds
  • C11D1/72—Ethers of polyoxyalkylene glycols

Definitions

• This invention relates to a detergent composition, in particular to a detergent composition for washing fabrics.
• Fabric washing compositions contain, as an essential ingredient, a surfactant system whose role is to assist in the removal of soil from the fabric and its suspension in the wash liquor.
• Suitable detergent active materials fall into a number of classes, including anionic, nonionic and cationic materials and marketed products contain materials selected from one or more of these classes.
• anionic detergent active materials are the alkyl benzene sulphonates and these provide satisfactory results especially at high temperatures.
• anionic surfactants There has been a desire to find alternative anionic surfactants for use in circumstances when alkyl benzene sulphonates are undesirable, but generally speaking the performance of other anionic detergent active materials is unsatisfactory.
• PAS primary alcohol sulphates
• PAS may be derived from both synthetic and natural alcohols containing from about 8 to 18 carbon atoms.
• suitable alcohols which can be used in alkyl sulphate manufacture include decyl, lauryl, myristyl, palmityl and stearyl alcohols and the mixture of fatty alcohols derived by reducing the glycerides of tallow and coconut oil.
• Natural alcohols, for example tallow or coconut alcohol give rise to straight chain, or linear, PAS.
• Synthetic alcohols for example those produced by the Oxo process can give rise to straight or branched chain PAS.
• GB 1 399 966 discloses a detergent composition in which the surfactant system is a mixture of sodium tallow alkyl sulphate and a nonionic detergent active material.
• tallow PAS suffers from the disadvantage that its performance at low temperatures is poor. With the trend towards lower wash temperatures this becomes a serious disadvantage.
• GB 1 399 966 referred to above also discloses the possibility of using the PAS derived from coconut oil, also linear. The performance of tallow PAS at low temperatures is poor.
• EP 342 917A it is suggested that a PAS which has a wider spread of chain lengths than is derivable from either tallow or coconut alcohol can perform better than tallow PAS at low temperatures and better than coconut PAS at higher temperatures.
• the PAS disclosed in EP 342 917A are derived from either synthetic or natural alcohols but are all linear PAS.
• US 3 480 556 discloses C1/C2 branched PAS in a formulation for dishwashing.
• JP 721 232 discloses a detergency negative for the replacement of C11 linear PAS with branched PAS of unspecified branching.
• a detergent composition for washing fabrics the composition containing a surfactant system comprising an anionic surfactant the major ingredient of which is a branched chain primary alkyl sulphate with primary alkyl chain length between 10 and 20 carbon atoms.
• the branched PAS preferably contains more than 10% by weight of branching based on the total weight of PAS, more preferably between 15% and 70% by weight of branching, most preferably between 30% and 65% of branching based on the total weight of PAS.
• the branches preferably contain at least four carbon atoms, and comprise at least 5% by weight of the branching based on the total weight of PAS.
• branched PAS having a range of primary alkyl chain lengths for example between 12 and 18 carbon atoms, or between 12 and 16 carbon atoms, most preferably between 13 and 15 carbon atoms.
• the water soluble salts of these anionic surfactants are preferred, especially the alkali metal salts thereof.
• compositions according to the invention include from 2% to 50%, such as from 4% to 30% by weight of the surfactant system.
• PAS materials may be included in the composition, for example linear PAS.
• compositions of the invention also preferably contain a nonionic surfactant.
• a nonionic surfactant has an HLB of less than 10.5, preferably less than 10.
• Suitable nonionic surfactants which may be used are the reaction products of compounds having a hydrophobic group and a reactive hydrogen atom, for example aliphatic alcohols, acids, amides or alkyl phenols with alkylene oxides, especially ethylene oxide either alone or with propylene oxide.
• Specific nonionic detergent compounds are alkyl (C6-C22) phenols-ethylene oxide condensates, the condensation products of aliphatic (C8-C18) primary or secondary linear or branched alcohols with ethylene oxide, and products made by condensation of ethylene oxide with the reaction products of propylene oxide and ethylenediamine.
• alkylene oxide adducts of fatty materials are used as the nonionic surfactants
• the number of alkylene oxide groups per molecule has a considerable effect upon the HLB of the nonionic surfactant.
• the chain length and nature of the fatty material is also influential, and thus the preferred number of alkylene oxide groups per molecule depends upon the nature and chain length of the fatty material.
• the weight ratio between the anionic surfactant and the nonionic surfactant lies between 10:1 and 1:4, most preferably between 4:1 and 1:3.
• the surfactant system may include other surfactant materials in addition to the specified alkyl sulphate and the above mentioned nonionic materials. These other surfactant materials may be selected from other anionic detergent active materials, zwitterionic or amphoteric detergent active materials or mixture thereof.
• any such further surfactant materials should preferably be present at a level which is no more than 25% preferably not more than 10% of the total amount of surfactant in the composition.
• the other anionic detergent active materials may be the usual water-soluble alkali metal salts of organic sulphonates having alkyl radicals containing from about 8 to about 22 carbon atoms, the term alkyl being used to include the alkyl portion of higher acyl radicals.
• Suitable synthetic anionic detergent compounds are sodium and potassium alkyl (C9-C20) benzene sulphonates, particularly sodium linear secondary alkyl (C10-C15) benzene sulphonate; sodium alkyl glyceryl ether sulphates, especially those ethers of the higher alcohols derived from tallow or coconut oil and synthetic alcohols derived from petroleum; sodium coconut oil fatty monoglyceride sulphates and sulphonates; the reaction products of fatty acids such as coconut fatty acids esterified with isethionic acid and neutralised with sodium hydroxide; sodium and potassium salts of fatty acid amides of methyl taurine; alkane monosulphonates such as those derived by reacting alpha-olefins (C8-C20) with sodium bisulphite and those derived from reacting paraffins with SO2 and Cl2 and then hydrolysing with a base to produce a random sulphate.
• compositions of the invention may contain a detergency builder material, this may be any material capable of reducing the level of free calcium ions in the wash liquor and will preferably provide the compositions with other beneficial properties such as the generation of an alkaline pH and the suspension of soil removed from the fabric.
• the amount of builder material in a composition of this invention may in particular be from 15% to 60% by weight of the composition.
• Examples of phosphorous-containing inorganic detergency builders when present, include the water-soluble salts, especially alkali metal pyrophosphates, orthophosphates, metaphosphates, polyphosphates and phosphonates.
• Specific examples of inorganic phosphate builders include sodium and potassium tripolyphosphates, orthophosphates and hexamataphosphates.
• non-phosphorous-containing inorganic detergency builders when present, include water-soluble alkali metal carbonates, bicarbonates, silicates and crystalline and amorphous aluminisilicates. Specific examples include sodium carbonate (with or without calcite seeds), potassium carbonate (with or without calcite seeds), sodium and potassium bicarbonates and silicates.
• organic detergency builders when present, include the alkali metal, ammonium and substituted ammonium polyacetates, carboxylates, polycarboxylates, polyacetyl carboxylates and polyhydroxysulphonates. Specific examples include sodium, potassium, lithium, ammonium and substituted ammonium salts of ethylenediaminetetraacetic acid, nitrilotriacetic acid, oxydisuccinic acid, melitic acid, benzene polycarboxylic acids and citric acid.
• compositions according to the invention be alkaline, that is at the concentration of 1 g/l in distilled water at 25°C the pH should be at least 8, preferably at least 10.
• the compositions may include a water-soluble alkaline salt. This salt may be a detergency builder or a non-building alkaline material.
• ingredients which may be present in the composition include fabric softening agents such as fatty amines, fabric softening clay materials, lather boosters such as alkanolamides, particularly the monoethanolamides derived from palm kernel fatty acids and coconut fatty acids, lather depressants, oxygen-releasing bleaching agents such as sodium perborate and sodium percarbonate, peracid bleach precursors, chlorine-releasing bleaching agents such as tricloroisocyanuric acid, inorganic salts such as sodium sulphate, and; usually present in very minor amounts, fluorescent agents, perfumes including deodorant perfumes, enzymes such as proteases, cellulases and amylases, lipases germicides and colourants.
• fabric softening agents such as fatty amines, fabric softening clay materials
• lather boosters such as alkanolamides, particularly the monoethanolamides derived from palm kernel fatty acids and coconut fatty acids
• lather depressants oxygen-releasing bleaching agents such as sodium perborate and sodium
• detergent compositions generally include sodium sulphate it may sometimes be desirable to have compositions which are sulphate free or contain low levels of sulphate.
• the detergent compositions according to the invention may be prepared by a number of different methods according to their physical form.
• they may be prepared by dry-mixing or coagglomeration.
• a preferred physical form is a granule incorporating a detergency builder salt and this is most conveniently manufactured by spray-drying at least part of the composition.
• a slurry is prepared containing the heat-insensitive components of the composition such as the surfactant system, builder material and filler. The slurry is spray-dried to form base powder granules with which any solid heat-sensitive ingredients may be mixed, such ingredients including bleaches and enzymes.
• the specified nonionic surfactants can be liquidified by melting or solvent dissolution and sprayed onto the base powder granules, rather than including them in the slurry for spray-drying.
• wash liquors were prepared in water having a hardness of 24°FH (equivalent to a free calcium ion concentration of 2.4 x 10 ⁇ 3 molar).
• the wash liquor contained the equivalent of 6g/l of a composition containing (by weight)
• the sodium metaborate was included as being equivalent in ionic strength to 8% sodium perborate monohydrate which would be present in practice.
• the bleach is left out of these experiments to avoid confusion between detergency and bleaching effects in the interpretation of the results.
• the anionic surfactants used were as set out in the following table: ELFAN 280 is ex Akzo, SYNPROL SULPHATE is ex ICI, DOBANOL 45 SULPHATE is the sulphate of DOBANOL 45 alcohol ex Shell, LIAL 145 SULPHATE is the sulphate of LIAL 145 alcohol ex Enichem.
• nonionic surfactant was SYNPERONIC A7 (ex ICI) which is principally C13/C15 alcohol ethoxylated with an average of 7 moles of ethylene oxide mixed with SYNPERONIC A3 (ex ICI) which is principally C13/15 alcohol ethoxylated with an average of 3 moles of ethylene oxide.
• This mixture has an HLB of approximately 9.
• the wash liquors were used to wash a fabric load at liquor to cloth ratio of 50:1.
• the load included a number of polyester monitors to which had previously been applied an amount of H3 tagged triolein. Measurement of the level of tagged triolein after washing, using standard radio-tracer techniques, gives an indication of the degree of detergency, i.e. soil removal, obtained.
• wash time was 20 minutes with an agitation of 70 rpm. Washes were isothermal at 40°C.
• sodium chloride was included as being equivalent in ionic strength to 8% sodium perborate monohydrate.
• nonionic surfactant mixture had an HLB of approximately 9.
• Wash liquors were prepared in water having a hardness of 24°FH to give a product concentration of 6g/l from a composition containing (by weight) 1 is C13/C15 sulphate with 46% branching of which 78% is methyl and 5% is butyl or higher. 2 is a sulphate with 35% branching of which 50% is methyl and 21% is butyl or higher.
• wash liquors were used to wash a fabric load as in Example 1.
• Example 12 was repeated using three different PASs in place of SYNPROL SULPHATE. The results obtained were as follows: These results show that branched PAS performs better than straight chain PAS.

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• 1990
  • 1990-01-22 GB GB909001404A patent/GB9001404D0/en active Pending
• 1991
  • 1991-01-17 AU AU69430/91A patent/AU631714B2/en not_active Ceased
  • 1991-01-18 IN IN20/BOM/91A patent/IN171886B/en unknown
  • 1991-01-21 EP EP91300456A patent/EP0439316B1/de not_active Revoked
  • 1991-01-21 CA CA002034666A patent/CA2034666C/en not_active Expired - Fee Related
  • 1991-01-21 BR BR919100241A patent/BR9100241A/pt unknown
  • 1991-01-21 ES ES91300456T patent/ES2079559T3/es not_active Expired - Lifetime
  • 1991-01-21 DE DE69114149T patent/DE69114149T2/de not_active Revoked
  • 1991-01-22 ZA ZA91453A patent/ZA91453B/xx unknown
  • 1991-01-22 JP JP3082055A patent/JPH04218598A/ja active Pending
  • 1991-01-22 MX MX024223A patent/MX173914B/es unknown

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