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
  • C11D1/66—Non-ionic compounds
  • C11D1/662—Carbohydrates or derivatives
• • 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
  • C11D1/667—Neutral esters, e.g. sorbitan 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
  • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
  • C11D3/0005—Other compounding ingredients characterised by their effect
  • C11D3/001—Softening compositions
  • C11D3/0015—Softening compositions liquid
• • 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
• • 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
  • C11D1/38—Cationic 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
  • C11D1/38—Cationic compounds
  • C11D1/62—Quaternary ammonium 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

Definitions

• the present invention relates to fabric softening compositions, in particular to those that soften without affecting the absorbency of the fabric and which suffer from a reduced tendency to develop malodour during manufacture, storage or use.
• Rinse added fabric softener compositions are well known.
• a disadvantage associated with conventional rinse conditioners is that although they increase the softness of a fabric they often simultaneously decrease its absorbency. This means that its ability to take up water decreases. This is particularly disadvantageous with towels where the consumer requires the towel to be soft, and yet, have a high absorbency.
• W098/16538 discloses fabric conditioning compositions comprising liquid or soft solid derivatives of a cyclic polyol or a reduced saccharide which give good softening and retain absorbency of the fabric.
• EP 0 380 406 discloses detergent compositions comprising a saccharide or reduced saccharide ester containing at least one fatty acid chain.
• WO 95/00614 discloses softening compositions comprising polyhydric alcohol esters and cationised cellulose.
• WO 96/15213 discloses textile softening agents containing alkyl, alkenyl and/or acyl group containing sugar derivatives, which are solid after esterification, in combination with nonionic and cationic emulsifiers.
• a liquid or soft solid fabric softening agent e.g. a CPE or RSE as herein-defined which addresses the above absorbency problem, is obtained by using unsaturated, usually predominantly unsaturated , fatty acid chains on the ester or ether functions.
• unsaturated, usually predominantly unsaturated , fatty acid chains on the ester or ether functions.
• Such compositions may suffer from the development of product malodour upon manufacture, storage or use. This is obviously highly undesirable.
• WO 97/13828 discloses fabric conditioning compositions comprising a heavy metal sequestrant.
• WO 96/21714 and WO 96/21715 disclose fabric conditioning compositions comprising chelating agents.
• WO 96/03481 discloses fabric conditioning compositions comprising 1 to 20 wt% antioxidant.
• the present invention is directed towards alleviating the above-mentioned problems.
• compositions of the present invention soften fabrics without detriment to the absorbency of the fabric, they are easily manufactured and do not suffer from unacceptable levels of malodour development upon manufacture, storage or use.
• a fabric softening composition comprising:
• compositions provide an unexpected combination of simultaneous fabric softening and retention of absorbency and exhibit improved malodour resistance, even, at elevated temperatures.
• a method of reducing malodour upon manufacture, storage or use in a composition comprising a CPE or RSE as herein described by the addition of a least one antioxidant.
• the initials CPE or RSE stand for a derivative of a cyclic polyol or of a reduced saccharide respectively which results from 35 to 100% of the hydroxyl groups of the cyclic polyol or reduced saccharide being esterified or etherified, the CPE or RSE having two or more ester or ether groups independently of one another attached to a C 8 to C 22 alkyl or alkenyl chain, and in which at least one of the chains attached to the ester or ether groups has at least one unsaturated bond.
• the CPE or RSE The CPE or RSE
• the CPE or RSE used according to the invention does not have any substantial crystalline character at 20°C. Instead it is preferably in a liquid or soft solid state as herein defined at 20°C.
• the liquid or soft solid (as hereinafter defined) CPEs or RSEs of the present invention result from 35 to 100% of the hydroxyl groups of the starting cyclic polyol or reduced saccharide being esterified or etherified with groups such that the CPEs or RSEs are in the required liquid or soft solid state. These groups typically contain unsaturation, branching or mixed chain lengths.
• the CPEs or RSEs have 3 or more ester or ether groups or mixtures thereof, for example 3 to 8, especially 3 to 5. It is preferred if two or more of the ester or ether groups of the CPE or RSE are independently of one another attached to a C 8 to C 22 alkyl or alkenyl chain.
• the C 8 to C 22 alkyl or alkenyl groups may be branched or linear carbon chains.
• 35 to 85% of the hydroxyl groups most preferably 40-80%, even more preferably 45-75%, such as 45-70% are esterified or etherified.
• the CPE or RSE contains at least 35% tri or higher esters, eg at least 40%.
• the CPE or RSE has at least one of the chains independently attached to the ester or ether groups having at least one unsaturated bond. This provides a cost effective way of making the CPE or RSE a liquid or a soft solid. It is preferred if predominantly unsaturated fatty chains, derived from, for example, rape oil, cotton seed oil, soybean oil, oleic, tallow, palmitoleic, linoleic, erucic or other sources of unsaturated vegetable fatty acids, are attached to the ester/ether groups.
• ester or ether chains of the CPE or RSE.
• the ester or ether chains of the CPE or RSE are preferably predominantly unsaturated.
• Preferred CPEs or RSEs include sucrose tetratallowate, sucrose tetrarapeate, sucrose tetraoleate, sucrose tetraesters of soybean oil or cotton seed oil, cellobiose tetraoleate, sucrose trioleate, sucrose triapeate, sucrose pentaoleate, sucrose pentarapeate, sucrose hexaoleate, sucrose hexarapeate, sucrose triesters, pentaesters and hexaesters of soybean oil or cotton seed oil, glucose tiroleate, glucose tetraoleate, xylose trioleate, or sucrose tetra-,tri-, penta- or hexa- esters with any mixture of predominantly unsaturated fatty acid chains.
• CPEs or RSEs are those with monosaturated fatty acid chains, i.e. where any polyunsaturation has been removed by partial hydrogenation.
• CPEs or RSEs based on polyunsaturated fatty acid chains eg sucrose tetralinoleate, may be used provided most of the polyunsaturation has been removed by partial hydrogenation.
• liquid CPEs or RSEs are any of the above but where the polyunsaturation has been removed through partial hydrogenation.
• the fatty acid chains Preferably 40% or more of the fatty acid chains contain an unsaturated bond, more preferably 50% or more, most preferably 60% or more. In most cases 65% to 100%, e.g. 65% to 95% contain an unsaturated bond.
• CPEs are preferred for use with the present invention.
• Inositol is a preferred example of a cyclic polyol. Inositol derivatives are especially preferred.
• cyclic polyol encompasses all forms of saccharides. Indeed saccharides are especially preferred for use with this invention. Examples of preferred saccharides for the CPEs or RSEs to be derived from are monosaccharides and disaccharides.
• Examples of monosaccharides include xylose, arabinose, galactose, fructose, sorbose and glucose. Glucose is especially preferred.
• Examples of disaccharides include maltose, lactose, cellobiose and sucrose. Sucrose is especially preferred.
• An example of a reduced saccharide is sorbitan.
• the liquid or soft solid CPEs can be prepared by methods well known to those skilled in the art. These include acylation of the cyclic polyol or reduced saccharide with an acid chloride; trans-esterification of the cyclic polyol or reduced saccharide fatty acid esters using a variety of catalysts; acylation of the cyclic polyol or reduced saccharide with an acid anhydride and acylation of the cyclic polyol or reduced saccharide with a fatty acid. See for instance US 4 386 213 and AU 14416/88 (both P&G).
• the CPE or RSE has 3 or more, preferably 4 or more ester or ether groups. If the CPE is a disaccharide it is preferred if the disaccharide has 3 or more ester or ether groups. Particularly preferred CPEs are esters with a degree of esterification of 3 to 5, for example, sucrose tri, tetra and penta esters.
• each ring of the CPE has one ether or ester group, preferably at the C 1 position.
• Suitable examples of such compounds include methyl glucose derivatives.
• CPEs examples include esters of alkyl(poly)glucosides, in particular alkyl glucoside esters having a degree of polymerisation from 1 to 2.
• the length of the unsaturated (and saturated if present) chains in the CPE or RSE is C 8 -C 22 , preferably C 12 -C 22 . It is possible to include one or more chains of C 1 -C 8 , however these are less preferred.
• the liquid or soft solid CPEs or RSEs of the present invention are characterised as materials having a solid:liquid ratio of between 50:50 and 0:100 at 20°C as determined by T 2 relaxation time NMR, preferably between 43:57 and 0:100, most preferably between 40:60 and 0:100, such as, 20:80 and 0:100.
• the T 2 NMR relaxation time is commonly used for characterising solid:liquid ratios in soft solid products such as fats and margarines.
• any component of the signal with a T 2 of less than 100 ⁇ s is considered to be a solid component and any component with T 2 ⁇ 100 ⁇ s is considered to be a liquid component.
• the prefixes e.g. tetra and penta
• the compounds exist as a mixture of materials ranging from the monoester to the fully esterified ester. It is the average degree of esterification which is used herein to define the CPEs and RSEs.
• the HLB of the CPE or RSE is typically between 1 and 3.
• the CPE or RSE is preferably present in the composition in an amount of 0.5-50% by weight, based upon the total weight of the composition, more preferably 1-30% by weight, such as 2-25%, eg 2-20%.
• the CPEs and RSEs for use in the compositions include those recited in the following examples, including, sucrose tetraoleate, sucrose pentaerucate, sucrose tetraerucate and sucrose pentaoleate.
• the Deposition Aid is The Deposition Aid
• a deposition aid is defined as any material that aids deposition of the selected CPE or RSE onto a fabric during the laundering process.
• the deposition aid may be selected from cationic compounds, such as cationic surfactants, nonionic surfactants, anionic surfactants, polymeric deposition aids or mixtures thereof. Quaternary ammonium compounds have been found to be particularly advantageous. A class of preferred deposition aids is fabric softening compounds.
• the deposition aid is cationic in nature. If a cationic surfactant or cationic softening aid is not present in the formulation it is preferred if a cationic polymeric deposition aid is present. Most preferably the deposition aid is both cationic in nature and is a fabric softening compound.
• deposition aids may be used, for example, a mixture of a cationic surfactant and a nonionic surfactant, or a fabric softening compound and a polymeric deposition aid.
• Suitable cationic deposition aids include water soluble single chain quaternary ammonium compounds. Examples include cetyl trimethyl ammonium chloride, cetyl trimethyl ammonium bromide, or any of those listed in European Patent No. 258 923 (Akzo Nobel).
• the deposition aid is a substantially water insoluble fabric softening compound.
• substantially water insoluble quaternary ammonium materials comprising a single alkyl or alkenyl chain having an average length equal to or greater than C 20 are preferred.
• Even more preferable are compounds comprising a polar head group and two alkyl or alkenyl chains each having an average chain length equal to or greater than C 14 .
• Preferred fabric softening deposition aids have two long alkyl or alkenyl chains with an average chain length equal to or greater than C 14 . More preferably each chain has an average chain length greater than C 16 . Most preferably at least 50% of each long chain alkyl or alkenyl group has a chain length of C 18 .
• the long chain alkyl or alkenyl groups of the fabric softening deposition aid are predominantly linear.
• the fabric softening deposition aids used in the compositions of the invention are molecules which provide excellent softening.
• Substantially water insoluble fabric compounds in the context of this invention are defined as fabric compounds having a solubility less than 1 x 10 -3 wt% in demineralised water at 20°C.
• the fabric softening deposition aids have a solubility less than 1 x 10 -4 wt%
• the fabric softening deposition aids have a solubility at 20°C in demineralised water from 1 x 10 -8 to 1 x 10 -6 wt%.
• Preferred fabric softening deposition aids are quaternary ammonium compounds, preferably those with at least one ester link.
• the fabric softening deposition aid is a water insoluble quaternary ammonium material which comprises a compound having two C 12-18 alkyl or alkenyl groups connected to the molecule via at least one ester link. It is more preferred if the quaternary ammonium material has two ester links present.
• An especially preferred ester-linked quaternary ammonium material for use in the invention can be represented by the formula (I): wherein each R 1 group is independently selected from C 1-4 alkyl, hydroxyalkyl or C 2-4 alkenyl groups; and wherein each R 2 group is independently selected from C 8-28 alkyl or alkenyl groups; T is X - is any suitable anion and n is 0 or an integer from 1-5.
• Preferred materials of this class include Di(tallowoyloxyethyl) dimethyl ammonium chloride and Methyl bis-[ethyl(tallowyl)]-2-hydroxyethyl ammonium methyl sulphate.
• a second preferred type of quaternary ammonium material can be represented by the formula (II): wherein R 1 , n, X - and R 2 are as defined above.
• the quaternary ammonium material is biologically degradable.
• Preferred materials of this class such as 1,2 bis [hardened tallowoyloxy] -3-trimethylammonium propane chloride and their method of preparation are, for example, described in US 4 137 180 (Lever Brothers).
• these materials comprise small amounts of the corresponding monoester as described in US 4 137 180 for example 1-hardened tallowoyloxy -2-hydroxy 3-trimethylammonium propane chloride.
• the fabric softening deposition aid of the composition may also be compounds having the formula (III): wherein X is an anion, A is an (m+n) valent radical remaining after the removal of (m+n) hydroxy groups from an aliphatic polyol having p hydroxy groups and an atomic ratio of carbon to oxygen in the range of 1.0 to 3.0 and up to 2 groups per hydroxy group selected from ethylene oxide and propylene oxide, m is 0 or an integer from 1 to p-n, n is an integer from 1 to p-m, and p is an integer of at least 2, B is an alkylene or alkylidene group containing 1 to 4 carbon atoms, R 3 , R 4 , R 5 and R 6 are, independently from each other, straight or branched chain C 1 -C 48 alkyl or alkenyl groups, optionally with substitution by one or more functional groups and/or interruption by at most 10 ethylene oxide and/or propylene oxide groups, or by at most two functional groups selected from or R 11
• the deposition aid may also comprise a mixture of different fabric softening compounds, for example a mixture of compounds of Formula (I) and Formula (II).
• the deposition aid may also be a nonionic surfactant, such as a nonionic ethoxylated surfactant having an HLB of from about 10 to about 20. It is advantageous if the surfactant alkyl group contains at least 12 carbon atoms.
• Suitable polymeric deposition aids for use with the invention include cationic and nonionic polymeric deposition aids.
• Suitable cationic polymeric deposition aids include cationic guar polymers such as; the Jaguar series of polymers (ex Rhodia), cationic cellulose derivatives such as Celquats, (ex National Starch), Ucare polymers (ex Amerchol), cationic starches e.g. potato starch such as SoftGels and Solvitose such as BDA (ex Avebe), C* bond polymers series from Cerestar, cationic polyacrylamides such as PCG (ex Allied Colloids), Flocaid series of polymers (ex National Starch) and cationic chitosan and derivatives.
• Cationic polymeric aids are particularly preferred in the absence of any other cationic material in the composition.
• Suitable nonionic deposition aids include Pluronics (ex BASF), dialkyl PEGs, cellulose derivatives as described in GB 213 730 (Unilever), hydroxy ethyl cellulose, starch, and hydrophobically modified nonionic polyols such as Acusol 880/882 (ex Rohm & Haas).
• the weight ratio of CPE or RSE to deposition aid is preferably within the range of from 15:1 to 1:10, more preferably within the range from 10:1 to 1:5, most preferably 8:1 to 1:3.
• the weight ratio of CPE or RSE to deposition aid is at least 1:1 (especially if the deposition aid is a fabric softening compound).
• the weight ratio of a softening deposition aid to CPE or RSE is at least 2:3, preferably at least 1:1.
• the weight ratio of softening deposition aid to CPE or RSE is from 3:2 to 1:10, more preferably from 2:3 to 1:10.
• the fabric softening compositions comprise one or more antioxidants in a weight ratio to the CPE or RSE of 20:1 or more.
• the deposition aid is preferably present in the compositions in an amount of 0.05-15% by weight, based upon the total weight of the composition, more preferably 0.1-10%, such as 0.5-7.5%.
• the antioxidant comprises at least one initiation inhibitor antioxidant and at least one propagation inhibitor. Mixtures of these two types of antioxidants have been found to be particularly beneficial, especially in reducing medium to long term malodour. Any antioxidant referred to in the following examples may be used.
• compositions preferably comprise 0.0001% to 1% by weight (in total), based on the total weight of the composition, of antioxidants, more preferably 0.00015% to 0.75%, even more preferably 0.002 to 0.5%, e.g. 0.002 to 0.45%.
• initiation inhibitors antioxidants can give good short and long term malodour suppression but a mixture of propagation inhibitor and initiation inhibitor antioxidants can give a surprisingly good short and long term malodour suppression.
• Suitable initiation inhibitor antioxidants include peroxide decomposers (e.g. sulphides, aryl and alkyl phosphites, metal salts of some thiodipropionates, xanthates and dithiophosphates).
• peroxide decomposers e.g. sulphides, aryl and alkyl phosphites, metal salts of some thiodipropionates, xanthates and dithiophosphates.
• Suitable initiation inhibitor antioxidant are metal ion sequestrants or deactivators. Suitable such types include N, N'-disalicylidene-1,2-propanediamine; oxalyl bis-(benzylidenehydrazide); ethylenediaminetetraacetic acid (EDTA); ethylenediamine-N,N'-disuccinic acid (EDDS); N-hydroxyethylene-diamine triacetic acid; nitrilotriacetic acid (NTA); ethylene diamine tetrapropionic acid; ethylenediamine-N,N'-diglutamic acid; 2-hydorxypropylenediamine-N,N'-disuccinic acid; triethylenetriamine hexacetic acid; diethylenetriamine pentacetic acid (DETPA); trans 1,2-diaminocyclohexane-N,N,N',N'-tetraacetic acid; ethanol diglycine; ethylenediamine te
• Metal ion sequestrants are preferably present at a level of between 0.0001% to 0.5% by weight, based on the total weight of the composition, most preferably 0.005% to 0.1%.
• Propagation inhibitor antioxidants consist primarily of hindered phenols/polyphenols. These can include those which are commonly used in the foods or plastics industries, such as butylated hydroxyanisole (BHA); butylated hydroxytoluene (BHT); tert-butyl hydroquinone (TBHQ); tocopherols; tocotrienols; ascorbic acid; ascobyl palmitate; octyl gallate; propyl gallate; lauryl gallate; N,N-bis(ethyl 3',5'-di-tert-butyl-4-hydroxybenzoate; 2-(N,N-dimethylamino)ethyl 3',5'-di-tert-butyl-4'hydroxybenzoate-N-cocoamine; 2-(N-methyl-N-cocamino)ethyl 3',5'-di-tert-butyl-4'-hydroxybenzoate; 2,2'-methylenebis(4
• Inhibitor antioxidants are preferably present at a level of 0.0001% to 0.5% by weight, based on the total weight of the composition, more preferably 0.0002% to 0.05%, most preferably 0.0002% to 0.02%.
• the weight ratio of the initiation inhibitor (i) to the propagation inhibitor (ii) is preferably within the range 10:1 to 1:10, more preferably 10:1 to 1:5, even more preferably 8:1 to 1:1, e.g. 6:1 to 1:1.
• the weight ratio of CPE or RSE to total antioxidant is 20:1 or greater, preferably 50:1 or greater, more preferably 75:1 or greater.
• the weight ratio may be as high as 1500:1 or greater. It is preferred that the weight ratio has an upper limit of 3000:1, e.g. 2500:1.
• compositions of the invention preferably have a pH from 1.5 to 7, more preferably from 1.5 to 5.
• compositions can also contain fatty acids, for example C 8 - C 24 alkyl or alkenyl monocarboxylic acids, or, polymeric carboxylic acids.
• fatty acids for example C 8 - C 24 alkyl or alkenyl monocarboxylic acids, or, polymeric carboxylic acids.
• saturated fatty acids are used, in particular, hardened tallow C 16 -C 18 fatty acids.
• the composition can also contain one or more optional ingredients, selected from electrolytes, non-aqueous solvents, pH buffering agents, perfumes, perfume carriers, fluorescers, colorants, hydrotropes, antifoaming agents, antiredeposition agents, polymeric and other thickeners, enzymes, optical brightening agents, opacifiers, anti-shrinking agents, anti-wrinkle agents, anti-spotting agents, germicides, fungicides, anti-corrosion agents, drape imparting agents, antistatic agents, sunscreens, colour care agents and ironing aids.
• optional ingredients selected from electrolytes, non-aqueous solvents, pH buffering agents, perfumes, perfume carriers, fluorescers, colorants, hydrotropes, antifoaming agents, antiredeposition agents, polymeric and other thickeners, enzymes, optical brightening agents, opacifiers, anti-shrinking agents, anti-wrinkle agents, anti-spotting agents, germicides, fungicides, anti-corrosion agents,
• any viscosity control agent used with rinse conditioners is suitable for use with the present invention, for example biological polymers such as Xanthum gum (Kelco ex Kelsan and Rhodopol ex Rhone-Poulenc), Guar gum (Jaguar ex Rhone-Poulenc), starches and cellulose ethers.
• biological polymers such as Xanthum gum (Kelco ex Kelsan and Rhodopol ex Rhone-Poulenc), Guar gum (Jaguar ex Rhone-Poulenc), starches and cellulose ethers.
• Synthetic polymers are useful viscosity control agents such as polyacrylic acid, poly vinyl pyrrolidone, polyethylene, carbomers, cross linked polyacrylamides such as Acosol 880/882 polyethylene and polyethylene glycols.
• compositions are substantially free of bleaches. Preferably the compositions are entirely free of bleaches.
• viscosity modifiers are decoupling polymers and deflocculating polymers.
• compositions may be in any form conventionally used for fabric softening compositions e.g., powder, paste, gel or liquid. Liquids, especially emulsions are preferred.
• compositions may be prepared by any suitable method.
• the antioxidant is oil soluble, e.g. the propagation inhibitor, the antioxidant is suitably pre-added with the CPE or RSE.
• the antioxidant is water soluble, e.g. the initiation inhibitor, especially metal sequestrants, the inhibitor is typically post-dosed to a pre-formed emulsion containing the CPE or RSE.
• %'s are by weight based on the total weight of the composition and represent the amount of active compound. Examples 1 and 14 are controls which do not contain antioxidant. In Ryoto 0-170, 85% or greater of the fatty acid chains contain an unsaturated bond.
• Examples 2 to 13 were prepared by dissolving the propagation inhibitor antioxidant (Irganox 1330 or Irganox 1010) in the CPE (Ryoto 0-170) and adding this to a separate mixture of a cationic and water (in an amount to make the composition up to 100 weight %).
• the resultant composition was mixed using a low shear Heidolph mixer to produce an emulsion.
• the initiation inhibitor antioxidant (Dequest 2066) was post-dosed to this emulsion.
• Examples 14 to 24 were prepared by mixing the cationic surfactant (CTAC) with water and then adding to this mixture the CPE (Ryoto O-170) at room temperature under conditions of high shear to produce an emulsion.
• CAC cationic surfactant
• the propagation inhibitor antioxidant (Irganox 1010) was dissolved in the CPE prior to emulsification.
• the initiation inhibitor antioxidant (Dequest 2066, DTPA or Na IDS) was post-dosed into the final emulsion.
• A is Irganox 1330; 1,3,5-trimerthyl,2,4,6-tris-(3',5' di-tert-butyl-4'-hydroxybenzyl)benzene.
• B is Irganox 1010; Tetrakis[methylene(3,5-di-tert-butyl-4-hydroxyhydrocinnamate)]methane (Both from Ciba Geigy).
• the samples were stored in screw-top glass bottles at 37°C to 45°C. At the intervals given in Tables 3 and 4 the bottles were removed from storage and the samples assessed for the development of malodour (which was determined by assessing the level of a rancid 'fatty' smell present). Before each assessment the samples allowed to equilibrate at room temperature. The malodour was assessed at room temperature by sniffing the odours from the equilibrated sample and assigning a value between 0 and 5 to indicated the level of malodour. Zero was given if the sample had no perceivable rancid smell and five was given for a very strong rancid smell. At least ten people assessed each sample and the average value was calculated from their response.
• Priolube 1446 neopentyl glycol dioleate ex Unichema
• Table 3 shows the malodour values determined for examples 1-13 over a 27 week testing period with storage between 37°C-45°C.
• Table 4 below shows the malodour values determined for examples 14-24 over a 4 week testing period with storage at 45°C.
• Table 4 Example Week 1 Week 2 Week 3 Week 4 14 (control) 2.50 2.71 2.76 3.00 15 - 2.43 2.75 2.83 16 1.83 1.86 1.17 1.75 17 1.67 1.79 1.33 1.83 18 1.58 1.93 2.17 1.50 19 2.17 1.86 1.58 1.83 20 2.25 2.00 1.50 1.67 21 1.75 1.93 1.42 1.83 22 1.60 1.07 1.00 1.42 23 1.17 1.57 1.25 0.83 24 1.00 1.21 1.75 1.25
• compositions which have improved malodour suppression in the presence of propagation and the initiation inhibitor are given in the following examples.
• the Ryoto products are available from Mitsubishi-Kagaku Food Corporation.
• Tables 6 to 9 were prepared by heating the ingredients together at 80°C, and mixing at high shear.
• Table 6 Mixtures with HEQ (fabric softening compound)
• Example 29 30
• Water 95 95 95 95 HEQ:oil ratio 1:4 3:2 2:3 HEQ 1 is 1,2 bis[hardened tallowoyloxy]-3-trimethylammonium propane chloride available from Hoechst.
• Arquad 2-HT a 1 1 1 1 Sucrose tetraoleate (oily liquid) 4 Sucrose pentaeureate (Ryoto ER-190)(oily liquid) 4 Sucrose tetraeureate (Ryoto ER-290)(oily liquid) 4 Irganox 1010 0.004 0.004 0.004 Dequest 2066 0.01 0.01 0.01 Water 95 95 95 Arquad 2-HT:oil 1:4 1:4 1:4 a Arquad 2-HT is ditallow dimethyl ammonium chloride
• Example 35 was prepared as a 5% total active emulsion/dispersion in water comprising 4.5% sucrose tetraerucate (oily liquid, Ryoto ER 290), 0.5% CTAC, 0.01% Dequest 2066, 0.0045% Irganox 1010 and 0.2% of a polymer deposition aid as given below:-
• Example 36 was prepared as a 1:4 emulsion/dispersion (5% total active) of DEEDMAC:sucrose pentaoleate (Ryoto 0-170) by mixing at high temperatures. To this is added , 0.01% Dequest 2066 and 0.004% Irganox 1010.
• a fully formulated fabric softening composition as according to the present invention was prepared as below: % by weight Genapol C150 a 1.6 ABS b 0.4 Ryoto O-170 15.4 Cationic potato starch c 2 Perfume 0.96 Preservative Minor Dye Minor Na IDS 0.01 Irganox 1330 0.015 Water Balance a Coco alcohol 15EO (ex Clariant) b dodecyl benzene sulphonic acid sodium salt (ex Aldrich Chemical Company) c Softgel BDA (ex Avebe)
• Table 8 shows the T 2 NMR solid:liquid ratio of CPEs and RSEs used according to the present invention. The ratios were measured at 20°C. The degree of esterification /etherification is stated. Table 8 Material Solid:Liquid ratio at 20°C Degree and % of esterification Physical Form Ryoto 0-170 0:100 5/8 62.5% Liquid Ryoto ER-290 0:100 4/8 50% Liquid Ryoto ER-190 0:100 5/8 50% soft solid Sucrose tetraoleate 0:100 4/8 50% Liquid Sucrose octaoleate 0:100 8/8 100% Liquid
• compositions in table 9 were prepared as follows: The propagation inhibitor was dissolved in the sucrose tetraoleate in a weight ratio of 99.9:0.1. This mixture was then comelted with the TEA and Coco-15EO and then added to water at 60°C with stirring using a low shear Heidolph mixer. The resulting mixture was stirred for 10 minutes before being cooled to room temperature. Where an initiation inhibitor was used, it was post-dosed to the final mixture as a 5% solution in water with mixing.
• sucrose polyoleate with an approximate degree of esterification of 4.
• c ethylene diamine-N, N' disuccinic acid (from Associated Octel).
• d ethylene diamine tetra acetic acid (from Contract Chemicals).
• e ethylene diamine tetra(methylene phosphonate) from Solutia.
• Table 10 shows the malodour values determined for examples 39-52 over a 9 week testing period with storage at 45°C.

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