EP0249474B1 - Cleaning compositions - Google Patents
Cleaning compositions Download PDFInfo
- Publication number
- EP0249474B1 EP0249474B1 EP19870305170 EP87305170A EP0249474B1 EP 0249474 B1 EP0249474 B1 EP 0249474B1 EP 19870305170 EP19870305170 EP 19870305170 EP 87305170 A EP87305170 A EP 87305170A EP 0249474 B1 EP0249474 B1 EP 0249474B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- composition
- process according
- isethionate
- fatty acyl
- 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.)
- Revoked
Links
- 239000000203 mixture Substances 0.000 title claims description 42
- 238000004140 cleaning Methods 0.000 title claims description 9
- -1 fatty acyl isethionate Chemical compound 0.000 claims description 27
- 239000003352 sequestering agent Substances 0.000 claims description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 19
- DBVJJBKOTRCVKF-UHFFFAOYSA-N Etidronic acid Chemical compound OP(=O)(O)C(O)(C)P(O)(O)=O DBVJJBKOTRCVKF-UHFFFAOYSA-N 0.000 claims description 17
- 239000003963 antioxidant agent Substances 0.000 claims description 16
- 230000003078 antioxidant effect Effects 0.000 claims description 15
- 239000000344 soap Substances 0.000 claims description 15
- SUMDYPCJJOFFON-UHFFFAOYSA-N isethionic acid Chemical compound OCCS(O)(=O)=O SUMDYPCJJOFFON-UHFFFAOYSA-N 0.000 claims description 13
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 11
- 239000003599 detergent Substances 0.000 claims description 11
- 229960001484 edetic acid Drugs 0.000 claims description 10
- 229910052742 iron Inorganic materials 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 235000021588 free fatty acids Nutrition 0.000 claims description 5
- 239000012298 atmosphere Substances 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
- GXGAKHNRMVGRPK-UHFFFAOYSA-N dimagnesium;dioxido-bis[[oxido(oxo)silyl]oxy]silane Chemical compound [Mg+2].[Mg+2].[O-][Si](=O)O[Si]([O-])([O-])O[Si]([O-])=O GXGAKHNRMVGRPK-UHFFFAOYSA-N 0.000 claims description 2
- 230000007760 free radical scavenging Effects 0.000 claims description 2
- 239000000391 magnesium silicate Substances 0.000 claims description 2
- 229940099273 magnesium trisilicate Drugs 0.000 claims description 2
- 229910000386 magnesium trisilicate Inorganic materials 0.000 claims description 2
- 235000019793 magnesium trisilicate Nutrition 0.000 claims description 2
- 239000002516 radical scavenger Substances 0.000 claims description 2
- 239000000047 product Substances 0.000 description 27
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 24
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical group CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 20
- 235000014113 dietary fatty acids Nutrition 0.000 description 17
- 239000000194 fatty acid Substances 0.000 description 17
- 229930195729 fatty acid Natural products 0.000 description 17
- 150000004665 fatty acids Chemical class 0.000 description 17
- 239000000463 material Substances 0.000 description 15
- 235000013162 Cocos nucifera Nutrition 0.000 description 14
- 244000060011 Cocos nucifera Species 0.000 description 14
- 229910052757 nitrogen Inorganic materials 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 11
- 238000007792 addition Methods 0.000 description 10
- 238000003860 storage Methods 0.000 description 10
- 150000002190 fatty acyls Chemical group 0.000 description 9
- UEUXEKPTXMALOB-UHFFFAOYSA-J tetrasodium;2-[2-[bis(carboxylatomethyl)amino]ethyl-(carboxylatomethyl)amino]acetate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O UEUXEKPTXMALOB-UHFFFAOYSA-J 0.000 description 7
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 6
- 239000011734 sodium Substances 0.000 description 6
- 229910052708 sodium Inorganic materials 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- JARKCYVAAOWBJS-UHFFFAOYSA-N hexanal Chemical compound CCCCCC=O JARKCYVAAOWBJS-UHFFFAOYSA-N 0.000 description 4
- HGBOYTHUEUWSSQ-UHFFFAOYSA-N pentanal Chemical compound CCCCC=O HGBOYTHUEUWSSQ-UHFFFAOYSA-N 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- YGHRJJRRZDOVPD-UHFFFAOYSA-N 3-methylbutanal Chemical compound CC(C)CC=O YGHRJJRRZDOVPD-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 238000006701 autoxidation reaction Methods 0.000 description 3
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 229940045998 sodium isethionate Drugs 0.000 description 3
- LADXKQRVAFSPTR-UHFFFAOYSA-M sodium;2-hydroxyethanesulfonate Chemical compound [Na+].OCCS([O-])(=O)=O LADXKQRVAFSPTR-UHFFFAOYSA-M 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 235000021355 Stearic acid Nutrition 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 150000001299 aldehydes Chemical class 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- RYPKRALMXUUNKS-UHFFFAOYSA-N hex-2-ene Chemical class CCCC=CC RYPKRALMXUUNKS-UHFFFAOYSA-N 0.000 description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 2
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 2
- 239000002243 precursor Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000008117 stearic acid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007850 degeneration Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 229910001651 emery Inorganic materials 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 125000001924 fatty-acyl group Chemical group 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004949 mass spectrometry Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002304 perfume Substances 0.000 description 1
- DOIRQSBPFJWKBE-UHFFFAOYSA-N phthalic acid di-n-butyl ester Natural products CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000000271 synthetic detergent Substances 0.000 description 1
- 150000004670 unsaturated fatty acids Chemical class 0.000 description 1
- 235000021122 unsaturated fatty acids Nutrition 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
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
- C11D3/0084—Antioxidants; Free-radical scavengers
-
- 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
- C11D1/126—Acylisethionates
-
- 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
- C11D10/00—Compositions of detergents, not provided for by one single preceding group
- C11D10/04—Compositions of detergents, not provided for by one single preceding group based on mixtures of surface-active non-soap compounds and soap
- C11D10/042—Compositions of detergents, not provided for by one single preceding group based on mixtures of surface-active non-soap compounds and soap based on anionic surface-active compounds and soap
-
- 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
- C11D17/006—Detergents in the form of bars or tablets containing mainly surfactants, but no builders, e.g. syndet bar
-
- 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
- C11D3/20—Organic compounds containing oxygen
- C11D3/2003—Alcohols; Phenols
- C11D3/2006—Monohydric alcohols
- C11D3/2034—Monohydric alcohols aromatic
Definitions
- This invention relates to cleaning compositions containing fatty acyl isethionate as at least part of detergent active present.
- the compositions may in particular be in the form of bars for personal washing.
- Bars containing fatty acyl isethionate as the main detergent active have been marketed commercially for a number of years, and have achieved considerable acceptance in North America.
- Bars containing substantial amounts of isethionate have a distinctive odour; and it is known that the quality of the fatty acid used in production of the isethionate needs to be controlled in order to control the odour of the freshly-made product. Provided that this quality control is done, the fresh product can have an acceptable odour despite being subjected to high temperature during the process of manufacture.
- the commercially made product with an acceptable odour when freshly made, has a shelf life which is generally satisfactory. Such a requirement must be the case for a product which has been accepted by consumers.
- the present invention resides in a finding that the shelf life of products containing fatty acyl isethionate can be improved by the incorporation into such products of small quantities of each of an antioxidant, a sequestrant for iron and a sequestrant for copper. It is essential to this invention that all three of these items are present.
- GB patent specification 1 081 233 (Bierre) teaches the use of a stabiliser for an antioxidant for soaps and synthetic detergents formed by mixing EDTA with a mixture of diethylene glycol and polyethylene glycol.
- GB patent specification 1 169 551 (Unilever Limited) teaches the use of 0.02% EHDP and 0.02% EDTA by weight in soap bars to improve their short-term storage properties.
- the specification suggests that fatty acyl isethionate can be present.
- the invention provides a process of producing a cleaning composition which contains detergent active including at least 40% by weight of the composition fatty acyl isethionate, which comprises preparing the fatty acyl isethionate from isethionate and free fatty acid under an inert atmosphere and flash cooling the product, subsequently, incorporating into the composition at least 0.002% by weight of the composition of each of an antioxidant, a sequestering agent for iron and a sequestering agent for copper.
- Products obtained by a process in which the antioxidant and sequestering agents are added after the flash cooling step are surprisingly stable as compared with products in which these ingredients are added prior to the flash-cooling step.
- the fatty acyl compound used to manufacture the isethionate is maintained under an inert atmosphere, for example it is sparged with nitrogen or some other gas which does not react with it, prior to reaction to form the fatty acyl isethionate. It should then be maintained under an atmosphere of such gas until the isethionate formation step has been carried out.
- Sparging with nitrogen will generally consist in bubbling the nitrogen through fatty acyl-containing precursor compound while the latter is in a liquid form.
- the fatty acyl compound normally used is coconut fatty acid.
- the antioxidant used should be a compound able to suppress reactions proceeding via a free radical mechanism, and will generally be a free radical scavenging agent. Many such compounds are available.
- the antioxidant is added after the fatty acyl isethionate has been formed and any other high temperature steps have been carried out. Suitably it is incorporated in the composition and maintained at a temperature below 170°C.
- a preferred antioxidant is 2,6-di-t-butyl-4-methylphenol referred to hereinafter as BHT.
- a preferred level of addition of this compound is 200 ppm (0.02% by weight) based on the fatty acyl-containing precursor.
- a preferred sequestering agent for copper is ethylene diamine tetra acetic acid (EDTA) or a soluble salt thereof such as its tetra sodium salt or mixtures thereof.
- EDTA ethylene diamine tetra acetic acid
- Such agents are known to enhance the activity of iron in accelerating autoxidation, but can be used successfully provided there is a satisfactory sequestering agent for iron present. The two sequestering agents are then acting synergistically.
- the preferred sequestering agent for iron is 1-hydroxyethane-1,1-diphosphonic acid (EHDP) or a soluble salt thereof or mixtures thereof. This sequestering agent can be used successfully even when the cleaning composition is superfatted. If the composition does not contain free fatty acid then an alternative possibility for the sequestering agent for iron is magnesium trisilicate.
- EHDP 1-hydroxyethane-1,1-diphosphonic acid
- sequestering agents are added after the fatty acyl isethionate has been formed and any other high temperature processing steps have been carried out.
- the sequestering agents are incorporated in the composition and maintained at a temperature below 170°C.
- the quantity of the antioxidant, and of each sequestering agent should be sufficient to be effective. As indicated above, the amount is at least 0.002% by weight of the composition and it is preferred to use a greater amount so that the composition contains at least 0.005% or at least 0.01% of each sequestering agent.
- the stoichiometric equivalent of 0.02% tetrasodium EDTA is 33 ppm copper.
- the stoichiometric equivalent of 0.02% EHDP (as pure acid) is 54 ppm iron. These quantities are well above the amounts of contaminating copper and iron which we have been able to detect in fatty acyl isethionate-containing bars as currently marketed.
- the total quantity of antioxidant plus sequestering agents will normally be below 1% by weight of the composition and indeed normally less than 0.1% by weight.
- Fatty acyl isethionates normally used in cleaning compositions have 8 to 18 carbon atoms in the fatty acyl group. Particularly preferred is coconut fatty acyl.
- the coconut fatty acyl may have been hardened, that is to say the amount of olefinic unsaturation reduced, in well known manner.
- the detergent actives present in a cleaning composition bar may consist exclusively or substantially exclusively of fatty acyl isethionate and soap. For example the amount of any other detergent active may be less than 2% of all detergent active present.
- Weight ratios of soap to fatty acyl isethionate may range from 10:90 to 95:5, preferably 15:85 to 60:40, and may be in the range 10:90 to 35:65 or 25:75.
- fatty acyl isethionate provides at least 40%, preferably from 48%, up to 53% by weight of the composition.
- acyl isethionate and soap are not the only detergent actives present they may nevertheless constitute most of the detergent active present, e.g. more than three quarters of it with the weight ratio of soap to acyl isethionate still being within the range as being within the range as indicated above.
- This invention is particularly applicable when fatty acyl isethionate constitutes at least the majority of detergent active present.
- a superfatted composition may contain more than 5% free fatty acid.
- the amount of superfatting acid may be more than equivalent to the amount of soap, so that soap is converted into its acid form to a substantial degree.
- the soap used may contain some additive to prevent deterioration of its own odour, but of course the amount will be diluted on mixing with fatty acyl isethionate. Generally a separate addition of the antioxidant and sequestrants of this invention will be required.
- the present invention may in particular be applied when the fatty acyl isethionate has been prepared by reaction of C8-C18 fatty acyl compound, usually the fatty acid itself with an isethionate at temperatures in excess of 100°C.
- EDTA and EHDP can conveniently be carried out by periodically dosing a small quantity of each of these materials into a tank where the fatty acyl isethionate is mixed with other ingredients of a cleaning composition. Both materials can be added in the form of aqueous solution and since the amounts which are added are small the increased water content of the composition is not significant.
- the two sequestering agents need to be added to the fatty acyl isethionate through separate pipework because if solutions of them are allowed to mix together before mixing with other material, there is a tendency for solids to crystallise out from the mixed solution.
- composition suitably admixed with for example soap and any other conventional additive e.g. dye, perfume, free fatty acid, sodium isethionate is suitably worked and formed into for example bars.
- any other conventional additive e.g. dye, perfume, free fatty acid, sodium isethionate is suitably worked and formed into for example bars.
- coconut fatty acid was reacted to form sodium fatty isethionate by the process described in US patent specification No. 3320292.
- the process comprises reacting a concentrated solution of sodium isethionate with coconut fatty acid in the presence of zinc oxide acting as catalyst.
- the reaction mixture is maintained at a temperature of about 232°C under a nitrogen blanket in order to remove water and allow the reaction to proceed.
- the resulting product is stripped to remove residual free coconut fatty acid.
- Stearic acid can be added at this stage in order to retain fluidity.
- the stripped product is then flash cooled, suitably by admixing with for example sodium isethionate solution.
- Other ingredients, in particular soap can then be admixed. For bars the mixture can then be rolled, milled, plodded and stamped.
- coconut fatty acid was reacted to form sodium fatty isethionate by the process of patent specification US 3220292. The process was carried out in slightly different ways to provide experimental and control products.
- the coconut fatty acid was sparged with nitrogen before reaction and the sparged material thereafter kept under a nitrogen atmosphere throughout all the reaction process steps carried out at elevated temperatures.
- BHT was included in the coconut fatty acid used for the experimental material, so as to provide 200 ppm BHT in the fatty acid. After flashcooling tetrasodium EDTA and EHDP were added to the experimental material to provide 0.02% by weight of each in the mixture.
- control material was prepared in the same way from the same batch of fatty acid but without nitrogen sparging, and without the additions of BHT, EDTA salt and EHDP.
- the experimental and control product materials were both processed into unperfumed and perfumed bars which were subjected to storage tests.
- the tester was provided with reference samples which were stored under refrigerated conditions so that these reference samples should undergo minimal change in odour. Even so, it should be appreciated that any ratings of 1, 2 or 3 are not truly absolute but rather are comparative between the experimental and control materials at the time of the test.
- Example 1 The preparation of sodium fatty acyl isethionate, processing of the product into bars and storage testing of those bars was carried out in the same way as for Example 1.
- the control bars are prepared without nitrogen sparging and without any BHT, EDTA or EHDP.
- a first experimental material was prepared while employing nitrogen sparging and adding the BHT to the coconut fatty acid.
- a second experimental material was also prepared while employing nitrogen sparging and the addition of BHT, to the fatty acid before reaction: additionally tetra sodium EDTA and EHDP were added to this second experimental material after the reaction had been carried out.
- the products were prepared from the same coconut and stearic fatty acid production (ex Emery Chemicals Toronto) in order to ensure equivalence in the initial odour and chemical composition of the raw materials. All batches were produced with nitrogen sparging during the heat-up and reaction stages and during the stripping and flash cooling stages.
- the chromatographs for the control (ie unpreserved) product E indicate significant peaks of low molecular weight aldehydes and hydrocarbons, which are attributable to the result of oxidative degeneration (ie autoxidation) of unsaturated fatty acids.
- the two principal contributors to the malodour are isopentanal/pentanal and hexanal.
- sample C is less stable than sample D.
- sample D is less stable than sample D.
- the most stable product was that which was prepared with Na4EDTA, EHDP and BHT added after flash cooling as virtually all the identifiable low molecular weight aldehydes and hydrocarbons were eliminated.
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Biochemistry (AREA)
- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- Detergent Compositions (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
- This invention relates to cleaning compositions containing fatty acyl isethionate as at least part of detergent active present. The compositions may in particular be in the form of bars for personal washing.
- Bars containing fatty acyl isethionate as the main detergent active have been marketed commercially for a number of years, and have achieved considerable acceptance in North America.
- There have also been numerous proposals for bars in which fatty acyl isethionate is used in admixture with other detergent active(s) which may be soap.
- Bars containing substantial amounts of isethionate have a distinctive odour; and it is known that the quality of the fatty acid used in production of the isethionate needs to be controlled in order to control the odour of the freshly-made product. Provided that this quality control is done, the fresh product can have an acceptable odour despite being subjected to high temperature during the process of manufacture.
- The commercially made product, with an acceptable odour when freshly made, has a shelf life which is generally satisfactory. Such a requirement must be the case for a product which has been accepted by consumers.
- We have now appreciated however the products containing fatty acyl isethionate, and having an acceptable odour when produced, nevertheless can have a tendency to develop an undesirable odour on prolonged storage at ambient temperature. We consider that it would be desirable to ameliorate this tendency, so as to enhance the shelf life of such products.
- We believe that the cause of this hitherto unrecognised defect is a process of autoxidation after production. Without being bound by this belief as to the cause, the present invention resides in a finding that the shelf life of products containing fatty acyl isethionate can be improved by the incorporation into such products of small quantities of each of an antioxidant, a sequestrant for iron and a sequestrant for copper. It is essential to this invention that all three of these items are present.
- GB patent specification 1 081 233 (Bierre) teaches the use of a stabiliser for an antioxidant for soaps and synthetic detergents formed by mixing EDTA with a mixture of diethylene glycol and polyethylene glycol.
- GB patent specification 1 169 551 (Unilever Limited) teaches the use of 0.02% EHDP and 0.02% EDTA by weight in soap bars to improve their short-term storage properties. The specification suggests that fatty acyl isethionate can be present.
- In a first aspect the invention provides a process of producing a cleaning composition which contains detergent active including at least 40% by weight of the composition fatty acyl isethionate, which comprises preparing the fatty acyl isethionate from isethionate and free fatty acid under an inert atmosphere and flash cooling the product, subsequently, incorporating into the composition at least 0.002% by weight of the composition of each of an antioxidant, a sequestering agent for iron and a sequestering agent for copper.
- Products obtained by a process in which the antioxidant and sequestering agents are added after the flash cooling step are surprisingly stable as compared with products in which these ingredients are added prior to the flash-cooling step.
- The fatty acyl compound used to manufacture the isethionate is maintained under an inert atmosphere, for example it is sparged with nitrogen or some other gas which does not react with it, prior to reaction to form the fatty acyl isethionate. It should then be maintained under an atmosphere of such gas until the isethionate formation step has been carried out.
- Sparging with nitrogen will generally consist in bubbling the nitrogen through fatty acyl-containing precursor compound while the latter is in a liquid form. The fatty acyl compound normally used is coconut fatty acid.
- The antioxidant used should be a compound able to suppress reactions proceeding via a free radical mechanism, and will generally be a free radical scavenging agent. Many such compounds are available. The antioxidant is added after the fatty acyl isethionate has been formed and any other high temperature steps have been carried out. Suitably it is incorporated in the composition and maintained at a temperature below 170°C.
- A preferred antioxidant is 2,6-di-t-butyl-4-methylphenol referred to hereinafter as BHT.
- A preferred level of addition of this compound is 200 ppm (0.02% by weight) based on the fatty acyl-containing precursor.
- A preferred sequestering agent for copper is ethylene diamine tetra acetic acid (EDTA) or a soluble salt thereof such as its tetra sodium salt or mixtures thereof. Such agents are known to enhance the activity of iron in accelerating autoxidation, but can be used successfully provided there is a satisfactory sequestering agent for iron present. The two sequestering agents are then acting synergistically.
- The preferred sequestering agent for iron is 1-hydroxyethane-1,1-diphosphonic acid (EHDP) or a soluble salt thereof or mixtures thereof. This sequestering agent can be used successfully even when the cleaning composition is superfatted. If the composition does not contain free fatty acid then an alternative possibility for the sequestering agent for iron is magnesium trisilicate.
- These preferred sequestering agents are added after the fatty acyl isethionate has been formed and any other high temperature processing steps have been carried out. Suitably the sequestering agents are incorporated in the composition and maintained at a temperature below 170°C.
- The quantity of the antioxidant, and of each sequestering agent should be sufficient to be effective. As indicated above, the amount is at least 0.002% by weight of the composition and it is preferred to use a greater amount so that the composition contains at least 0.005% or at least 0.01% of each sequestering agent.
- The stoichiometric equivalent of 0.02% tetrasodium EDTA is 33 ppm copper. The stoichiometric equivalent of 0.02% EHDP (as pure acid) is 54 ppm iron. These quantities are well above the amounts of contaminating copper and iron which we have been able to detect in fatty acyl isethionate-containing bars as currently marketed. The total quantity of antioxidant plus sequestering agents will normally be below 1% by weight of the composition and indeed normally less than 0.1% by weight.
- Fatty acyl isethionates normally used in cleaning compositions have 8 to 18 carbon atoms in the fatty acyl group. Particularly preferred is coconut fatty acyl. The coconut fatty acyl may have been hardened, that is to say the amount of olefinic unsaturation reduced, in well known manner. The detergent actives present in a cleaning composition bar may consist exclusively or substantially exclusively of fatty acyl isethionate and soap. For example the amount of any other detergent active may be less than 2% of all detergent active present. Weight ratios of soap to fatty acyl isethionate may range from 10:90 to 95:5, preferably 15:85 to 60:40, and may be in the range 10:90 to 35:65 or 25:75.
- As taught in US Patent 2 894 912 (Geitz) fatty acyl isethionate provides at least 40%, preferably from 48%, up to 53% by weight of the composition.
- If acyl isethionate and soap are not the only detergent actives present they may nevertheless constitute most of the detergent active present, e.g. more than three quarters of it with the weight ratio of soap to acyl isethionate still being within the range as being within the range as indicated above. This invention is particularly applicable when fatty acyl isethionate constitutes at least the majority of detergent active present.
- A superfatted composition may contain more than 5% free fatty acid. In a composition which is preponderantly fatty acyl isethionate, together with some soap, the amount of superfatting acid may be more than equivalent to the amount of soap, so that soap is converted into its acid form to a substantial degree.
- In a compositions which contains a small amount of soap, the soap used may contain some additive to prevent deterioration of its own odour, but of course the amount will be diluted on mixing with fatty acyl isethionate. Generally a separate addition of the antioxidant and sequestrants of this invention will be required.
- The present invention may in particular be applied when the fatty acyl isethionate has been prepared by reaction of C₈-C₁₈ fatty acyl compound, usually the fatty acid itself with an isethionate at temperatures in excess of 100°C.
- The addition of EDTA and EHDP to fatty acyl isethionate can conveniently be carried out by periodically dosing a small quantity of each of these materials into a tank where the fatty acyl isethionate is mixed with other ingredients of a cleaning composition. Both materials can be added in the form of aqueous solution and since the amounts which are added are small the increased water content of the composition is not significant.
- However, the two sequestering agents need to be added to the fatty acyl isethionate through separate pipework because if solutions of them are allowed to mix together before mixing with other material, there is a tendency for solids to crystallise out from the mixed solution.
- The composition suitably admixed with for example soap and any other conventional additive e.g. dye, perfume, free fatty acid, sodium isethionate is suitably worked and formed into for example bars.
- Embodiments of the present invention will now be described by way of example only with reference to the following Examples.
- In each of the examples coconut fatty acid was reacted to form sodium fatty isethionate by the process described in US patent specification No. 3320292. In outline the process comprises reacting a concentrated solution of sodium isethionate with coconut fatty acid in the presence of zinc oxide acting as catalyst. The reaction mixture is maintained at a temperature of about 232°C under a nitrogen blanket in order to remove water and allow the reaction to proceed. The resulting product is stripped to remove residual free coconut fatty acid. Stearic acid can be added at this stage in order to retain fluidity. The stripped product is then flash cooled, suitably by admixing with for example sodium isethionate solution. Other ingredients, in particular soap, can then be admixed. For bars the mixture can then be rolled, milled, plodded and stamped.
- Coconut fatty acid was reacted to form sodium fatty isethionate by the process of patent specification US 3220292. The process was carried out in slightly different ways to provide experimental and control products. For the experimental material the coconut fatty acid was sparged with nitrogen before reaction and the sparged material thereafter kept under a nitrogen atmosphere throughout all the reaction process steps carried out at elevated temperatures. BHT was included in the coconut fatty acid used for the experimental material, so as to provide 200 ppm BHT in the fatty acid. After flashcooling tetrasodium EDTA and EHDP were added to the experimental material to provide 0.02% by weight of each in the mixture. The control material was prepared in the same way from the same batch of fatty acid but without nitrogen sparging, and without the additions of BHT, EDTA salt and EHDP. The experimental and control product materials were both processed into unperfumed and perfumed bars which were subjected to storage tests.
- To assess storage stability, the bars were wrapped in a conventional wrapping used for bars for personal washing, and stored for twelve weeks at room temperature (20°C), 28°C and 38°C. Odour was assessed by a human tester and rated on a scale as follows:
- 1. Excellent
- 2. Good ie standard for a commercial product
- 3. Fair
- 4. Poor
- 5. Unsatisfactory
- To assist in standardising the results observed at one time with the results at another time e.g. after storage, the tester was provided with reference samples which were stored under refrigerated conditions so that these reference samples should undergo minimal change in odour. Even so, it should be appreciated that any ratings of 1, 2 or 3 are not truly absolute but rather are comparative between the experimental and control materials at the time of the test.
-
- The preparation of sodium fatty acyl isethionate, processing of the product into bars and storage testing of those bars was carried out in the same way as for Example 1. As in Example 1 the control bars are prepared without nitrogen sparging and without any BHT, EDTA or EHDP. A first experimental material was prepared while employing nitrogen sparging and adding the BHT to the coconut fatty acid. A second experimental material was also prepared while employing nitrogen sparging and the addition of BHT, to the fatty acid before reaction: additionally tetra sodium EDTA and EHDP were added to this second experimental material after the reaction had been carried out.
- The bars were wrapped, subjected to storage under various conditions, and tested in the same manner as for Example 1.
- The experiment was then repeated but with no control material (lacking nitrogen sparging and all of BHT, EDTA and EHDP), and making perfumed bars only. The storage tests were used to compare the materials with and without EDTA and EHDP.
-
- It can be seen from the Tables that the provision of nitrogen sparging prior to reaction and addition of BHT to the coconut fatty acid before reaction produced only a marginal improvement in the odour rating whereas if this was combined with addition of EDTA and EHDP, there was a clearly observable improvement.
- The preparation of sodium fatty acyl isethionate and processing of the product into bars was carried out in the same way as for Example 1. In the present example five different processing regimes were followed with regard to the use of the sequestering and antioxidant agents in order to compare the effect of the presence of the sequestering agents and the antioxidant when used separately and when used together and the point of addition of the antioxidant.
- The products were prepared from the same coconut and stearic fatty acid production (ex Emery Chemicals Toronto) in order to ensure equivalence in the initial odour and chemical composition of the raw materials. All batches were produced with nitrogen sparging during the heat-up and reaction stages and during the stripping and flash cooling stages.
- The five different regimes followed were:
- A. 200 ppm BHT added to the coconut fatty acid raw material (equivalent to 75 ppm BHT on a finished product basis).
- B. 0.02% Na₄EDTA and 0.02% EHDP added to the flashed cooled sodium fatty isethionate base.
- C. A combination of A. and B.
- D. 0.02% Na₄EDTA, 0.02% EHDP and 0.0075% BHT (75 ppm BHT on a finished product basis) added to the flash cooled sodium fatty isethionate base (process according to the present invention).
- E. A control product, with no initiation or propagation inhibitors, except 15 ppm of BHT normally contained in the stearic acid.
- All the regimes were absent of the standard 30 ppm BHT which had been added in the previous examples. When produced each bar was packaged in standard cartons and wraps. For the product of each regime some bars were stored at room temperature and some at a raised temperature (38°C). After one month the bars stored at 38°C were analysed by gas chromatography and mass spectroscopy.
-
- The chromatographs for the control (ie unpreserved) product E indicate significant peaks of low molecular weight aldehydes and hydrocarbons, which are attributable to the result of oxidative degeneration (ie autoxidation) of unsaturated fatty acids. The two principal contributors to the malodour are isopentanal/pentanal and hexanal.
- The addition of 200 ppm of BHT alone to the coconut fatty acids (sample A) offered little improvement, as significant levels of isopentanal and hexanal were still present. However methyl pentenes and hexane were substantially eliminated.
- The products (samples B, C and D) prepared with the two chelating agents were significantly more stable than the control product or the product with BHT only. The low molecular weight hydrocarbons, isopentanal/pentanal, and the methyl pentenes were all minimised or eliminated from all bars containing Na₄EDTA and EHDP.
- A comparison of samples C and D, which each contain all three agents but differ in their point of addition of BHT, shows that sample C is less stable than sample D. Thus the most stable product was that which was prepared with Na₄EDTA, EHDP and BHT added after flash cooling as virtually all the identifiable low molecular weight aldehydes and hydrocarbons were eliminated.
Claims (10)
- A process for preparing a cleaning composition which contains detergent active including at least 40% by weight of the composition fatty acyl isethionate characterised in that the process comprises: (a) preparing the fatty acyl isethionate from isethionate and free fatty acid under an inert atmosphere and flash cooling the product and, (b) subsequently, incorporating into the composition at least 0.002% by weight of the composition of an antioxidant, at least 0.002% by weight of the composition of a sequestering agent for iron and at least 0.002% by weight of the composition of a sequestering agent for copper.
- A process according to claim 1 wherein the sequestering agents are incorporated in the cleaning composition and maintained at a temperature below 170°C.
- A process according to claim 1 or claim 2 wherein the antioxidant is incorporated in the cleansing composition and maintained at a temperature below 170°C.
- A process according to any one of claims 1 to 3 wherein the antioxidant is a free radical scavenging agent.
- A process according to any one of the claims 1 to 4 wherein the sequestering agent for copper is selected from the group comprising ethylene diamine tetra acetic acid, a soluble salt thereof and mixtures thereof.
- A process according to any one of claims 1 to 4 wherein the sequestering agent for iron is selected from the group comprising 1-hydroxyethane-1,1-diphosphonic acid, a soluble salt thereof, magnesium trisilicate and mixtures thereof.
- A process according to any one of the claims 1 to 6 wherein the sequestering agents are added separately to the composition.
- A process according to any one of claims 1 to 7 including incorporating soap into the composition.
- A process according to any one of claims 1 to 8 including forming the composition into bars.
- Product obtainable by the process of any of claims 1 to 9.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB868614462A GB8614462D0 (en) | 1986-06-13 | 1986-06-13 | Cleaning composition |
GB8614462 | 1986-06-13 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0249474A2 EP0249474A2 (en) | 1987-12-16 |
EP0249474A3 EP0249474A3 (en) | 1989-08-16 |
EP0249474B1 true EP0249474B1 (en) | 1993-06-09 |
Family
ID=10599431
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19870305170 Revoked EP0249474B1 (en) | 1986-06-13 | 1987-06-11 | Cleaning compositions |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0249474B1 (en) |
CA (1) | CA1311399C (en) |
DE (1) | DE3786113T2 (en) |
ES (1) | ES2054671T3 (en) |
GB (1) | GB8614462D0 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8129327B2 (en) | 2006-12-01 | 2012-03-06 | The Procter & Gamble Company | Packaging for high moisture bar soap |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5234619A (en) * | 1989-05-05 | 1993-08-10 | Lever Brothers Company, Division Of Conopco, Inc. | Aqueous based personal washing cleanser |
US5132037A (en) * | 1989-05-05 | 1992-07-21 | Lever Brothers Company, Division Of Conopco, Inc. | Aqueous based personal washing cleanser |
GB9310323D0 (en) * | 1993-05-19 | 1993-06-30 | Unilever Plc | Improvements relating to soap bars |
DE4409321A1 (en) * | 1994-03-18 | 1995-09-21 | Henkel Kgaa | Low m.pt fatty acid isethionate-based detergent mixt. |
US5691287A (en) * | 1995-12-21 | 1997-11-25 | S. C. Johnson & Son, Inc. | Low irritation cleansing bar |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1464581A (en) * | 1965-02-19 | 1967-01-06 | Glycol-based stabilizer for antioxidant for soaps | |
NL137165C (en) * | 1966-03-11 | |||
BE788917A (en) * | 1971-09-17 | 1973-03-15 | Ici Ltd | STABILIZATION OF FATS AND OILS |
US4663070A (en) * | 1985-01-25 | 1987-05-05 | Lever Brothers Company | Process for preparing soap-acyl isethionate toilet bars |
-
1986
- 1986-06-13 GB GB868614462A patent/GB8614462D0/en active Pending
-
1987
- 1987-06-08 CA CA000539133A patent/CA1311399C/en not_active Expired - Fee Related
- 1987-06-11 ES ES87305170T patent/ES2054671T3/en not_active Expired - Lifetime
- 1987-06-11 EP EP19870305170 patent/EP0249474B1/en not_active Revoked
- 1987-06-11 DE DE19873786113 patent/DE3786113T2/en not_active Revoked
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8129327B2 (en) | 2006-12-01 | 2012-03-06 | The Procter & Gamble Company | Packaging for high moisture bar soap |
Also Published As
Publication number | Publication date |
---|---|
DE3786113T2 (en) | 1993-09-16 |
DE3786113D1 (en) | 1993-07-15 |
GB8614462D0 (en) | 1986-07-16 |
EP0249474A3 (en) | 1989-08-16 |
EP0249474A2 (en) | 1987-12-16 |
ES2054671T3 (en) | 1994-08-16 |
CA1311399C (en) | 1992-12-15 |
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