EP1392806A1 - Fabric softening composition - Google Patents

Fabric softening composition

Info

Publication number
EP1392806A1
EP1392806A1 EP02722512A EP02722512A EP1392806A1 EP 1392806 A1 EP1392806 A1 EP 1392806A1 EP 02722512 A EP02722512 A EP 02722512A EP 02722512 A EP02722512 A EP 02722512A EP 1392806 A1 EP1392806 A1 EP 1392806A1
Authority
EP
European Patent Office
Prior art keywords
fabric
softener
softening composition
fabric softening
alkyl
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.)
Granted
Application number
EP02722512A
Other languages
German (de)
French (fr)
Other versions
EP1392806B1 (en
Inventor
Francesca Reckitt Benckiser Italia ROSIELLO
Anthony Reckitt Benckiser Italia SIDOTI
Roberto Reckitt Benckiser Italia VANIN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Reckitt Benckiser NV
Original Assignee
Reckitt Benckiser NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Reckitt Benckiser NV filed Critical Reckitt Benckiser NV
Publication of EP1392806A1 publication Critical patent/EP1392806A1/en
Application granted granted Critical
Publication of EP1392806B1 publication Critical patent/EP1392806B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • C11D3/16—Organic compounds
    • C11D3/34—Organic compounds containing sulfur
    • C11D3/3418—Toluene -, xylene -, cumene -, benzene - or naphthalene sulfonates or sulfates
    • 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
    • C11D1/645—Mixtures of compounds all of which are cationic
    • 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
    • C11D1/38—Cationic compounds
    • C11D1/40—Monoamines or polyamines; Salts thereof
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/38—Cationic compounds
    • C11D1/42—Amino alcohols or amino ethers
    • 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

Definitions

  • the present invention relates to fabric softening compositions, preferably translucent, clear or transparent conditioners, which in addition to a cationic fabric softener comprise a fabric co-softener, and a hydrotope .
  • Fabric softening compositions are known in the art for imparting benefits such as softness and/or antistatic properties to the treated fabric.
  • consumer acceptance of fabric softening compositions is determined not only by the performance achieved with these products but also by the aesthetics associated therewith. Viscosity of the product is therefore an important aspect of the successful formulation of such commercial products, stable low to medium viscosities being highly preferred by consumers.
  • Clear fabric softeners are usually achieved through the use of high concentrations of organic solvents. Viscous solutions are usually prepared by the addition of gelling/thickening agent. However we have found that certain clear compositions can be produced without the use of organic solvents, without the need to add a thickening/gelling system. The reduction or elimination of a thickening/gelling system will reduce the cost of the formulation. In addition the organic solvents used to produce clear fabric softening compositions have a negative odour.
  • a softening composition with a medium viscosity, able to provide fabric softening, static control, water dispersibility, rewettability and aesthetic fragrance benefits. It is a further feature of the invention that, preferably, the softening composition is clear.
  • a person skilled in the art can produce clear fabric softener compositions by the combination of quaternary ammonium compound with organic solvents. These compositions generally have high organic solvent concentrations which are needed to provide clarity, but have a high negative odour and, usually, poor softening performance .
  • compositions have a low viscosity in the absence of a thickening/gelling system.
  • Aqueous viscous cleaning compositions including: a) inorganic or organic acid, b) a cationic detergent, c) a water insoluble or partially soluble covalent compound such us an ester of an inorganic acid, a fatty acid or an ester of a fatty acid, a carboxylic acid ester or amine- oxide and d) anionic sulfonate, are described on Patents GB 1240469 or EP 0 265 979.
  • Clear single phase fabric softeners comprising an anionic surfactant having an alkyl radical containing at least eight carbon atoms, a cationic surfactant and an effective amount of propylene glycol and an alkali metal salt of benzene, toluene or xylene sulfonate are described in US 4751009.
  • the present invention is based on the surprising discovery that it is possible to obtain a stable clear medium viscosity fabric softener that performs well on softening fabrics, which comprises a cationic surfactant, a co-softening agent and a hydrotope, such as an alkali metal salt of a benzene, cumene, toluene or xylene sulfonate.
  • a cationic surfactant such as an alkali metal salt of a benzene, cumene, toluene or xylene sulfonate.
  • medium viscosity it is meant a viscosity of 50 cps to 5000 cps, preferably 200 to 2,000 cps, as measured on a Brookfield LV, spindle 2, 12 rpm and at 20°C.
  • the present invention is a fabric softening composition comprising :
  • a cationic fabric softener in an amount of 3 % to 20 % by weight
  • a method of treating fabric which comprises the step of contacting said fabric in the rinse cycle of a fabric washing machine with an aqueous medium containing a composition as defined herein.
  • a cationic fabric softener is an essential ingredient of the invention.
  • Typical levels of the cationic fabric softener within the softening compositions are 3 % to 20 % by weight, preferably from 4 % to 15 % by weight, and more preferably from 4 % to 10 % by weight of the composition.
  • the preferred cationic fabric softening components include the water-dispersible quaternary ammonium fabric softeners or an amine precursor thereof.
  • Preferred quaternary ammonium compounds herein are of formula (I) :
  • Q is selected from -CH 2 -, -0-C(0)-, -C- (0) -0- and
  • R 1 , R 2 and R 3 are independently selected from C ⁇ -C 4 alkyl or C ⁇ -C 4 hydroxyalkyl or H (typically methyl) ;
  • T 1 is C 6 -C 22 alkyl or alkenyl (typically alkyl) ; n is an integer from 0 to 4 (preferably n is 2) ; and
  • X " is a softener-compatible anion.
  • Non-limiting examples of a softener-compatible anion include chloride or methyl sulfate, preferably chloride.
  • the alkyl, or alkenyl, chain TI should contain at least 5 carbon atoms, preferably at least 13 carbon atoms, more preferably at least 15 carbon atoms .
  • the chain may be straight or branched.
  • a specific example of a quaternary ammonium compound suitable for use in the aqueous fabric softening compositions herein is hydrogenated tallow trimethyl ammonium X " , wherein X " is preferably chloride.
  • the level of unsaturation of the chain can be measured by the Iodine Value (IV) of the corresponding fatty acid, which in the present case should preferably be in the range of from 5 to 100 with two categories of compounds being distinguished, having a IV below or above 25.
  • the anion is merely present as a counterion of the positively charged quaternary ammonium compounds.
  • the nature of the counterion is not critical at all to the practice of the present invention. The scope of this invention is not considered limited to any particular anion.
  • amine precursor thereof it is meant the secondary or tertiary amine corresponding to the above quaternary ammonium compounds, said amines being substantially protonated in the present compositions due to the pH values .
  • the pH of the liquid compositions herein is a preferred parameter of the present invention. Indeed, the pH influences the stability of the quaternary ammonium or amine precursors compounds, especially in prolonged storage conditions.
  • the pH as defined in the present context, is measured in the neat compositions at 20°C.
  • the neat pH measured in the above-mentioned conditions, is ideally in the range of from 2 to 5.
  • the pH of these compositions herein can be regulated by the addition of a Bronsted acid.
  • suitable acids include the inorganic mineral acids, carboxylic acids, in particular the low molecular weight (C ⁇ -C 5 ) carboxylic acids, and alkylsulfonic acids.
  • Suitable inorganic acids include HCl , H 2 S0 4 , HN0 3 and H 3 PO 4 .
  • Suitable organic acids include formic, acetic, citric, methylsulfonic and ethylsulfonic acid.
  • Preferred acids are citric, hydrochloric, phosphoric, formic, methylsulfonic acid, and benzoic acids. Especially preferred is citric acid.
  • the softening composition of the invention will also comprise a liquid carrier.
  • Suitable liquid carriers are selected from water, organic solvents and mixtures thereof.
  • the liquid carrier employed in the instant compositions is preferably at least primarily water due to its low cost, safety, and environmental compatibility.
  • the level of water in the liquid is preferably at least 80 %, most preferably at least 90 %, by weight of the carrier.
  • the liquid carrier is at least 20 %, most preferably at least 30 %, by weight of the composition. Mixtures of water and low molecular weight
  • organic solvent may be used.
  • Preferred low molecular weight organic solvents are; monohydric alcohol, such as ethanol , propanol, iso-propanol or butanol ; dihydric alcohol, such as glycol; trihydric alcohols, such as glycerol, and polyhydric (polyol) alcohols.
  • Hydrotropes aid in the solubility or dispersibility of different surfactants in aqueous solution. This usually has the side effect of lowering the viscosity of the resulting mixture.
  • a hydrotrope in our compositions causes a viscosity increase. Whilst not being bound by theory we believe this is likely due to the complex formed between the anionic hydrotrope salt and the cationic surfactant. The complex is soluble and clear in solution and provides a viscosity increasing matrix.
  • Suitable and preferred hydrotropes are the alkali metal salts of a benzene, cumene, toluene and xylene sulfonate, ideally the sodium salt.
  • Fabric co-softeners are understood by the skilled person as non-quarternary hydrophilic compounds which are added to boost softening performance .
  • R 3 , R 4 and R 5 are C ⁇ 6-22 alkyl or alkenyl (preferably alkenyl) , preferably C17-1 9 ideally C ⁇ 8 ; and the remaining group (s), if any, are C ⁇ -4 hydroxyalkyl or hydrogen, preferably C ⁇ -4 hydroxyalkyl, ideally hydroxyethyl .
  • a preferred compound is oleylbis (2 -hydroxyethyl) amine .
  • co-softeners include, but are not limited to; amine oxides, betaines and alkali metal soaps.
  • the preferred fatty acid precursors contain a high proportion of unsaturation, with oleyl groups being the most preferred.
  • the composition may also contain optional components which may be suitable for further improving the aesthetic appearance of the fabrics treated therewith.
  • optional components include polyethylene glycols, additional fabric softening components, enzymes, cyclodextrin/perfume complexes and free perfume delivery systems, and mixtures thereof, preferably in the form of an alkali metal salt, ideally sodium.
  • Polyethylene glycols polyethylene glycols, additional fabric softening components, enzymes, cyclodextrin/perfume complexes and free perfume delivery systems, and mixtures thereof, preferably in the form of an alkali metal salt, ideally sodium.
  • a polymeric material which can optionally be included is polyethylene glycol (PEG) .
  • PEG polyethylene glycol
  • PEG may provide an increase in the viscosity stability upon storage of the composition of the invention.
  • Typical molecular weight ranges for these purposes range from 500 to 100,000. preferably from 1,000 to 50,000, more preferably from 1,500 to 10,000.
  • a most preferred molecular weight is 4,000.
  • typical levels of polyethylene glycols are from 0.01 to 1 % by weight, preferably from 0.05 % to 0.5 % by weight of the composition.
  • composition may also optionally contain additional components, example include, but are not limited by, surfactant concentration aids, electrolyte concentration aids, antioxidants and reductive agents, emulsifiers, bacteriocides, colorants, perfumes, preservatives, optical brighteners, anti ionisation agents, chelants, natural and synthetic extracts and antifoam agents.
  • additional components include, but are not limited by, surfactant concentration aids, electrolyte concentration aids, antioxidants and reductive agents, emulsifiers, bacteriocides, colorants, perfumes, preservatives, optical brighteners, anti ionisation agents, chelants, natural and synthetic extracts and antifoam agents.
  • Stabilisers may also optionally be added. When used, said stabiliser will help achieving the desired finished product viscosity as well as stabilising the finished product upon storage.
  • Stabilisers are typically selected from single long chain alkyl cationic surfactants, non- ionic alkoxylated surfactants, amine oxides, fatty acids, and mixtures thereof, typically used at a level of from 0 to 15 % by weight of the composition. Electrolyte Stabilisers
  • Inorganic viscosity control agents which can also act like or augment the effect of the stabilisers, include water-soluble, ionisable salts which can also optionally be incorporated into the compositions of the present invention. Incorporation of these components to the composition must be processed at a very slow rate.
  • ionisable salts can be used.
  • suitable salts are the halides of the Group IA and IIA metals of the Periodic Table of the Elements, e.g., calcium chloride, magnesium chloride, sodium chloride, potassium bromide, and lithium chloride.
  • the ionisable salts are particularly useful during the process of mixing the ingredients to make the compositions herein, and later to obtain the desired viscosity.
  • the amount of ionisable salts used depends on the amount of active ingredients used in the compositions and can be adjusted according to the desires of the formulator. Typical levels of salts used to control the composition viscosity are from 20 to 2000 parts per million (ppm) , preferably from 20 to 1100 ppm, by weight of the composition.
  • Alkylene polyammonium salts can be incorporated into the composition to give viscosity control in addition to or in place of the water-soluble, ionisable salts above.
  • these agents can act as scavengers, forming ion pairs with anionic detergent carried over from the main wash, in the rinse, and on the fabrics, and may improve softness performance. These agents may stabilise the viscosity over a broader range of temperature, especially at low temperatures, compared to the inorganic electrolytes .
  • alkylene polyammonium salts include 1-lysine monohydrochloride and 1, 5-diammonium 2-methyl pentane dihydrochloride .
  • the present invention also encompasses a method for treating fabrics which comprises the step of contacting said fabrics in the rinse cycle with an aqueous medium containing a composition as defined hereinbefore.
  • the aqueous medium is at a temperature between 2 to 40 °C, preferably between 5 to 25 °C.
  • a cationic surfactant of formula (I) usually gives a relatively low performance compared with standard ditallow Esterquat .
  • a hydrotrope such as Sodium Cumene Sulphonate (SCS) and Sodium Xylene Sulphonate (SXS)
  • SCS Sodium Cumene Sulphonate
  • SXS Sodium Xylene Sulphonate

Landscapes

  • 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)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)

Abstract

Fabric softening compositions comprise 3-20 wt. % a cationic fabric softener, 1-10 wt. % a fabric co-softener and at least 1 wt. % a hydrotrope. They are of medium viscosity, transparent and free from organic solvents and show good softening performance.

Description

Fabric Softening Composition
The present invention relates to fabric softening compositions, preferably translucent, clear or transparent conditioners, which in addition to a cationic fabric softener comprise a fabric co-softener, and a hydrotope .
Fabric softening compositions are known in the art for imparting benefits such as softness and/or antistatic properties to the treated fabric. However, nowadays, consumer acceptance of fabric softening compositions is determined not only by the performance achieved with these products but also by the aesthetics associated therewith. Viscosity of the product is therefore an important aspect of the successful formulation of such commercial products, stable low to medium viscosities being highly preferred by consumers.
To fulfil such need, fatty acids have been incorporated into fabric softening compositions. Such a disclosure can be found in the pending Application EP 95870104.7.
Clear fabric softeners are usually achieved through the use of high concentrations of organic solvents. Viscous solutions are usually prepared by the addition of gelling/thickening agent. However we have found that certain clear compositions can be produced without the use of organic solvents, without the need to add a thickening/gelling system. The reduction or elimination of a thickening/gelling system will reduce the cost of the formulation. In addition the organic solvents used to produce clear fabric softening compositions have a negative odour.
Accordingly, it is an object of the invention to provide a softening composition with a medium viscosity, able to provide fabric softening, static control, water dispersibility, rewettability and aesthetic fragrance benefits. It is a further feature of the invention that, preferably, the softening composition is clear.
Clear fabric softener compositions containing high levels of organic solvent are well know in the art as described on Patents WO 96/19552 or WO 01/02522 or WO 96/09365 or US 5656585 or WO 99/09122 or US 5747443.
A person skilled in the art can produce clear fabric softener compositions by the combination of quaternary ammonium compound with organic solvents. These compositions generally have high organic solvent concentrations which are needed to provide clarity, but have a high negative odour and, usually, poor softening performance .
Furthermore these compositions have a low viscosity in the absence of a thickening/gelling system.
Aqueous viscous cleaning compositions including: a) inorganic or organic acid, b) a cationic detergent, c) a water insoluble or partially soluble covalent compound such us an ester of an inorganic acid, a fatty acid or an ester of a fatty acid, a carboxylic acid ester or amine- oxide and d) anionic sulfonate, are described on Patents GB 1240469 or EP 0 265 979.
Clear single phase fabric softeners comprising an anionic surfactant having an alkyl radical containing at least eight carbon atoms, a cationic surfactant and an effective amount of propylene glycol and an alkali metal salt of benzene, toluene or xylene sulfonate are described in US 4751009.
The present invention is based on the surprising discovery that it is possible to obtain a stable clear medium viscosity fabric softener that performs well on softening fabrics, which comprises a cationic surfactant, a co-softening agent and a hydrotope, such as an alkali metal salt of a benzene, cumene, toluene or xylene sulfonate.
By medium viscosity, it is meant a viscosity of 50 cps to 5000 cps, preferably 200 to 2,000 cps, as measured on a Brookfield LV, spindle 2, 12 rpm and at 20°C.
The performance of these fabric softening compositions is not compromised by their higher viscosity, they are highly dispersible into water without the normal hydration gelling that can occur with some viscous surfactant systems. The softening performance is as good as, if not better than, that from traditional systems.
The present invention is a fabric softening composition comprising :
a) a cationic fabric softener in an amount of 3 % to 20 % by weight
b) 1 % to 10 % by weight of a fabric co-softener
c) 0% to 5% by weight of a hydrotropej preferably 0.1% to 2.5% by weight.
In another aspect of the invention, there is provided a method of treating fabric which comprises the step of contacting said fabric in the rinse cycle of a fabric washing machine with an aqueous medium containing a composition as defined herein.
Cationic fabric softener
A cationic fabric softener is an essential ingredient of the invention. Typical levels of the cationic fabric softener within the softening compositions are 3 % to 20 % by weight, preferably from 4 % to 15 % by weight, and more preferably from 4 % to 10 % by weight of the composition.
The preferred cationic fabric softening components include the water-dispersible quaternary ammonium fabric softeners or an amine precursor thereof. Preferred quaternary ammonium compounds herein are of formula (I) :
wherein Q is selected from -CH2-, -0-C(0)-, -C- (0) -0- and
-0-C(0)-0- (preferably -CH2-) ;
R1, R2 and R3 are independently selected from Cι-C4 alkyl or Cι-C4 hydroxyalkyl or H (typically methyl) ;
T1 is C6-C22 alkyl or alkenyl (typically alkyl) ; n is an integer from 0 to 4 (preferably n is 2) ; and
X" is a softener-compatible anion.
Non-limiting examples of a softener-compatible anion include chloride or methyl sulfate, preferably chloride.
The alkyl, or alkenyl, chain TI should contain at least 5 carbon atoms, preferably at least 13 carbon atoms, more preferably at least 15 carbon atoms . The chain may be straight or branched.
A specific example of a quaternary ammonium compound suitable for use in the aqueous fabric softening compositions herein is hydrogenated tallow trimethyl ammonium X", wherein X" is preferably chloride. The level of unsaturation of the chain can be measured by the Iodine Value (IV) of the corresponding fatty acid, which in the present case should preferably be in the range of from 5 to 100 with two categories of compounds being distinguished, having a IV below or above 25.
The anion is merely present as a counterion of the positively charged quaternary ammonium compounds. The nature of the counterion is not critical at all to the practice of the present invention. The scope of this invention is not considered limited to any particular anion.
By "amine precursor thereof" it is meant the secondary or tertiary amine corresponding to the above quaternary ammonium compounds, said amines being substantially protonated in the present compositions due to the pH values .
For the preceding fabric softening agents, especially with biodegradable fabric softening agents, the pH of the liquid compositions herein is a preferred parameter of the present invention. Indeed, the pH influences the stability of the quaternary ammonium or amine precursors compounds, especially in prolonged storage conditions.
The pH, as defined in the present context, is measured in the neat compositions at 20°C. For optimum hydrolytic stability of these compositions, the neat pH, measured in the above-mentioned conditions, is ideally in the range of from 2 to 5. The pH of these compositions herein can be regulated by the addition of a Bronsted acid.
Examples of suitable acids include the inorganic mineral acids, carboxylic acids, in particular the low molecular weight (Cι-C5) carboxylic acids, and alkylsulfonic acids. Suitable inorganic acids include HCl , H2S04, HN03 and H3PO4. Suitable organic acids include formic, acetic, citric, methylsulfonic and ethylsulfonic acid. Preferred acids are citric, hydrochloric, phosphoric, formic, methylsulfonic acid, and benzoic acids. Especially preferred is citric acid.
The softening composition of the invention will also comprise a liquid carrier. Suitable liquid carriers are selected from water, organic solvents and mixtures thereof. The liquid carrier employed in the instant compositions is preferably at least primarily water due to its low cost, safety, and environmental compatibility. The level of water in the liquid is preferably at least 80 %, most preferably at least 90 %, by weight of the carrier. Preferably the liquid carrier is at least 20 %, most preferably at least 30 %, by weight of the composition. Mixtures of water and low molecular weight
(by "low molecular weight" we mean less than 200) organic solvent may be used. Preferred low molecular weight organic solvents are; monohydric alcohol, such as ethanol , propanol, iso-propanol or butanol ; dihydric alcohol, such as glycol; trihydric alcohols, such as glycerol, and polyhydric (polyol) alcohols.
Hydrotrope
Hydrotropes aid in the solubility or dispersibility of different surfactants in aqueous solution. This usually has the side effect of lowering the viscosity of the resulting mixture. Surprisingly, we have found that the use of a hydrotrope in our compositions causes a viscosity increase. Whilst not being bound by theory we believe this is likely due to the complex formed between the anionic hydrotrope salt and the cationic surfactant. The complex is soluble and clear in solution and provides a viscosity increasing matrix.
Examples of suitable and preferred hydrotropes are the alkali metal salts of a benzene, cumene, toluene and xylene sulfonate, ideally the sodium salt. Fabric Co-softener
Fabric co-softeners are understood by the skilled person as non-quarternary hydrophilic compounds which are added to boost softening performance .
Among the suitable co-softeners are amines of formula (ID R3 R4
\ / N
(ID
R3
at least one, and preferably no more than two, of R3, R4 and R5 are Cι6-22 alkyl or alkenyl (preferably alkenyl) , preferably C17-19 ideally Cχ8; and the remaining group (s), if any, are Cι-4 hydroxyalkyl or hydrogen, preferably Cι-4 hydroxyalkyl, ideally hydroxyethyl . A preferred compound is oleylbis (2 -hydroxyethyl) amine .
Other co-softeners include, but are not limited to; amine oxides, betaines and alkali metal soaps. The preferred fatty acid precursors contain a high proportion of unsaturation, with oleyl groups being the most preferred.
Optional
The composition may also contain optional components which may be suitable for further improving the aesthetic appearance of the fabrics treated therewith. Suitable optional components include polyethylene glycols, additional fabric softening components, enzymes, cyclodextrin/perfume complexes and free perfume delivery systems, and mixtures thereof, preferably in the form of an alkali metal salt, ideally sodium. Polyethylene glycol
A polymeric material which can optionally be included is polyethylene glycol (PEG) . When used, PEG may provide an increase in the viscosity stability upon storage of the composition of the invention. Typical molecular weight ranges for these purposes range from 500 to 100,000. preferably from 1,000 to 50,000, more preferably from 1,500 to 10,000. A most preferred molecular weight is 4,000. When present, typical levels of polyethylene glycols are from 0.01 to 1 % by weight, preferably from 0.05 % to 0.5 % by weight of the composition.
Additional Components
The composition may also optionally contain additional components, example include, but are not limited by, surfactant concentration aids, electrolyte concentration aids, antioxidants and reductive agents, emulsifiers, bacteriocides, colorants, perfumes, preservatives, optical brighteners, anti ionisation agents, chelants, natural and synthetic extracts and antifoam agents.
Stabilisers
Stabilisers may also optionally be added. When used, said stabiliser will help achieving the desired finished product viscosity as well as stabilising the finished product upon storage. Stabilisers are typically selected from single long chain alkyl cationic surfactants, non- ionic alkoxylated surfactants, amine oxides, fatty acids, and mixtures thereof, typically used at a level of from 0 to 15 % by weight of the composition. Electrolyte Stabilisers
Inorganic viscosity control agents which can also act like or augment the effect of the stabilisers, include water-soluble, ionisable salts which can also optionally be incorporated into the compositions of the present invention. Incorporation of these components to the composition must be processed at a very slow rate.
A wide variety of ionisable salts can be used. Examples of suitable salts are the halides of the Group IA and IIA metals of the Periodic Table of the Elements, e.g., calcium chloride, magnesium chloride, sodium chloride, potassium bromide, and lithium chloride. The ionisable salts are particularly useful during the process of mixing the ingredients to make the compositions herein, and later to obtain the desired viscosity. The amount of ionisable salts used depends on the amount of active ingredients used in the compositions and can be adjusted according to the desires of the formulator. Typical levels of salts used to control the composition viscosity are from 20 to 2000 parts per million (ppm) , preferably from 20 to 1100 ppm, by weight of the composition.
Alkylene polyammonium salts can be incorporated into the composition to give viscosity control in addition to or in place of the water-soluble, ionisable salts above. In addition, these agents can act as scavengers, forming ion pairs with anionic detergent carried over from the main wash, in the rinse, and on the fabrics, and may improve softness performance. These agents may stabilise the viscosity over a broader range of temperature, especially at low temperatures, compared to the inorganic electrolytes .
Specific examples of alkylene polyammonium salts include 1-lysine monohydrochloride and 1, 5-diammonium 2-methyl pentane dihydrochloride . The present invention also encompasses a method for treating fabrics which comprises the step of contacting said fabrics in the rinse cycle with an aqueous medium containing a composition as defined hereinbefore. Preferably, the aqueous medium is at a temperature between 2 to 40 °C, preferably between 5 to 25 °C.
The invention is illustrated in the following non limiting examples, in which all percentages are on an active weight % basis unless otherwise stated.
Softness Improvement
The use of a cationic surfactant of formula (I) usually gives a relatively low performance compared with standard ditallow Esterquat .
We have tested the softness performance of formulations with monoalkyl cationic versus a standard, commercially available fabric softening composition based on ditallow Esterquat .
Terry cloths were washed with the different Fabric Softeners, then, when dry, were judged by a group of panelists .
The panelists were asked to assign a number from 0 (very harsh) to 7 (very soft) to the test swatches. Products tested and results
As is plainly evident, 1,85 % of an amine fabric co- softener of formula (II) greatly increases the softness performance of a monoalkyl cationic fabric softener.
Viscosity Improvement
To increase the viscosity of the formulation, and, at the same time, maintain the clarity of the product is very difficult .
The following chart lists the thickeners evaluated:
There are two Polymers that give increased viscosities: Rohagit KF720 and Polyflos SA 4W. Unfortunately, they have disadvantage of being very expensive and are difficult to dissolve in the formulations.
We have found that the addition of a hydrotrope, such as Sodium Cumene Sulphonate (SCS) and Sodium Xylene Sulphonate (SXS) , can be used as thickeners: Sodium cumene sulphonate (active 40%) at a 2% level increases the viscosity of the formulation from 10 cps to 500-700 cps.
Additional examples include
As can be seen, increasing the hydrotrope level above 2.5% results in decreased viscosity and opacity, both undesirable features of the present invention.

Claims

Claims
A fabric softening composition comprising:
a) a cationic fabric softener in an amount of 3 to 20 % by weight,
b) 1 % to 10 % by weight of a fabric co-softener
c) 0 % to 5 % by weight of hydrotrope
A fabric softening composition as claimed in claim 1 wherein the cationic fabric softener is 4 % to 10 % by weight of the composition.
A fabric softening composition as claimed in claim 1 or 2 wherein the cationic fabric softener is quaternary ammonium compounds having the formula (I), below:
wherein Q is selected from -CH2-, -0-C(0)-, -C- (0) -
0- and -0-C(0)-0- (preferably -CH2-);
R1, R2 and R3 are independently selected from Cι-C4 alkyl or Cι-C4 hydroxyalkyl or H (preferably methyl) ;
T1 is C6-C22 alkyl or alkenyl (preferably alkyl ) ; n is an integer from 0 to 4 (preferably n is 2) ; and
X" is a softener-compatible anion.
4. A fabric softening composition as claimed in claim 3 wherein the softener-compatible anion X" is chloride or methyl sulfate, preferably chloride.
5. A fabric softening composition as claimed in claim 3 and 4 wherein the alkyl or alkenyl chain TI should contain at least 5 carbon atoms, preferably at least 13 carbon atoms, more preferably at least 15 carbon atoms .
6. A fabric softening composition as claimed in any claim from 1 to 5 wherein the hydrotrope is a benzene sulfonate, cumene sulfonate, toluene sulfonate or xylene sulfonate, in the form of an alkali metal salt, ideally sodium.
7. A fabric softening composition as claimed in any claim from 1 to 6 wherein the hydrotrope is at a level of 0.1 to 2.5%w/v.
A fabric softening composition as claimed in any claim from 1 to 6 wherein the fabric co-softener is a compound of formula (II)
RJ R4
\ /
N
(ID
R5
at least one, and preferably no more than two, of R3, R4 and R5 are Cι6-22 alkyl or alkenyl (preferably alkenyl) , preferably Cι7-ι9 ideally Cι8; and the remaining group (s), if any, are Cι-4 hydroxyalkyl or hydrogen, preferably Cι-4 hydroxyalkyl , ideally hydroxyethyl .
9. A fabric softening composition as claimed in claim 8 wherein the fabric co-softener is oleylbis(2- hydroxyethyl ) amine .
10. A method of treating fabric which comprises the step of contacting the fabric in the rinse cycle of a fabric washing machine with an aqueous medium containing a fabric softening composition as defined in any claim from 1 to 9.
EP02722512A 2001-05-11 2002-05-10 Method for softening fabrics Expired - Lifetime EP1392806B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB0111542 2001-05-11
GB0111542A GB2375356A (en) 2001-05-11 2001-05-11 Cationic fabric softening compositions
PCT/GB2002/002166 WO2002092742A1 (en) 2001-05-11 2002-05-10 Fabric softening composition

Publications (2)

Publication Number Publication Date
EP1392806A1 true EP1392806A1 (en) 2004-03-03
EP1392806B1 EP1392806B1 (en) 2005-12-07

Family

ID=9914458

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02722512A Expired - Lifetime EP1392806B1 (en) 2001-05-11 2002-05-10 Method for softening fabrics

Country Status (6)

Country Link
EP (1) EP1392806B1 (en)
AT (1) ATE312154T1 (en)
DE (1) DE60207854T2 (en)
ES (1) ES2249571T3 (en)
GB (1) GB2375356A (en)
WO (1) WO2002092742A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10676694B2 (en) 2016-12-22 2020-06-09 The Procter & Gamble Company Fabric softener composition having improved detergent scavenger compatibility
WO2024240607A1 (en) * 2023-05-25 2024-11-28 Unilever Ip Holdings B.V. Laundry composition

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GR76044B (en) * 1981-04-06 1984-08-03 Procter & Gamble
SE8504661L (en) * 1984-10-17 1986-04-18 Colgate Palmolive Co SOFTYING AND ANTISTATIC LIQUID DETERGENT COMPOSITION
DE3661481D1 (en) * 1985-05-28 1989-01-26 Unilever Nv Liquid cleaning and softening compositions
EP0265979B2 (en) * 1986-09-29 1998-06-03 Akzo Nobel N.V. Thickened aqueous cleaning compositions
NO170944C (en) * 1987-01-24 1992-12-30 Akzo Nv THICKNESSED, MOISTURE PREPARATIONS, AND USE OF SUCH
US4751009A (en) * 1987-08-05 1988-06-14 Akzo America Inc. Fabric softeners comprising stable single phase clear solutions of anionic and cationic surfactants
GB8805837D0 (en) * 1988-03-11 1988-04-13 Unilever Plc Fabric conditioning composition
GB8916308D0 (en) * 1989-07-17 1989-08-31 Unilever Plc Fabric softening
US5466394A (en) * 1994-04-25 1995-11-14 The Procter & Gamble Co. Stable, aqueous laundry detergent composition having improved softening properties

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO02092742A1 *

Also Published As

Publication number Publication date
WO2002092742A1 (en) 2002-11-21
GB0111542D0 (en) 2001-07-04
ATE312154T1 (en) 2005-12-15
ES2249571T3 (en) 2006-04-01
EP1392806B1 (en) 2005-12-07
GB2375356A (en) 2002-11-13
DE60207854T2 (en) 2006-08-17
DE60207854D1 (en) 2006-01-12

Similar Documents

Publication Publication Date Title
EP0239910A2 (en) Biodegradable fabric softeners
IE882892L (en) Liquid fabric softening and antistatic compositions
JPH10508622A (en) Concentrated biodegradable quaternary ammonium fabric softener composition containing intermediate iodine value fatty acid chains
WO1993019147A1 (en) Fabric softening compositions containing mixtures of softener material and highly ethoxylated curd dispersant
EP3094714A1 (en) Method for stabilizing a softening composition
JP2001513153A (en) Rinse-added laundry additive composition containing color care agent
WO1997046654A1 (en) Fabric softening compositions
EP1560905B2 (en) Fabric softening composition containing esterquat with specific ester distribution and sequestrant
EP1392806B1 (en) Method for softening fabrics
IE860831L (en) Fabric conditioner
EP1757674B1 (en) Fabric softening composition
CA2257199C (en) Fabric softening compositions
JP2757892B2 (en) Composition for softening liquid textile products
JP3784417B2 (en) Fabric softening composition
WO1997011142A1 (en) Stabilised fabric softening compositions
EP0839899B1 (en) Fabric softening compositions
US5929025A (en) Stabilized fabric softening compositions comprising a fabric softening compound, fatty acid, and perfume
CA2172496A1 (en) Use of alkylene polyammonium salts to increase cationic density in fabric softeners
EP0891408A1 (en) Use of a fabric softener composition
MXPA99007993A (en) Rinse added laundry additive compositions having color care agents
MXPA01005518A (en) Cationic ester surfactants which are suitable for both liquid and powder formulations

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20031006

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

AX Request for extension of the european patent

Extension state: AL LT LV MK RO SI

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

RTI1 Title (correction)

Free format text: METHOD FOR SOFTENING FABRICS

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20051207

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20051207

Ref country code: BE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20051207

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20051207

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20051207

Ref country code: LI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20051207

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REF Corresponds to:

Ref document number: 60207854

Country of ref document: DE

Date of ref document: 20060112

Kind code of ref document: P

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060307

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060307

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060307

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2249571

Country of ref document: ES

Kind code of ref document: T3

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20060508

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060510

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060531

NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20060908

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

REG Reference to a national code

Ref country code: FR

Ref legal event code: CA

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20051207

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060510

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20051207

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 14

REG Reference to a national code

Ref country code: DE

Ref legal event code: R082

Ref document number: 60207854

Country of ref document: DE

Representative=s name: BARDEHLE PAGENBERG PARTNERSCHAFT MBB PATENTANW, DE

Ref country code: DE

Ref legal event code: R081

Ref document number: 60207854

Country of ref document: DE

Owner name: RECKITT BENCKISER VANISH B.V., NL

Free format text: FORMER OWNER: RECKITT BENCKISER N.V., HOOFDDORP, NL

REG Reference to a national code

Ref country code: ES

Ref legal event code: PC2A

Owner name: RECKITT BENCKISER VANISH B.V.

Effective date: 20160321

REG Reference to a national code

Ref country code: FR

Ref legal event code: TP

Owner name: RECKITT BENCKISER VANISH B.V., NL

Effective date: 20160411

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 15

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732E

Free format text: REGISTERED BETWEEN 20160804 AND 20160810

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 16

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 17

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20200428

Year of fee payment: 19

Ref country code: FR

Payment date: 20200414

Year of fee payment: 19

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20210412

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20210414

Year of fee payment: 20

Ref country code: ES

Payment date: 20210601

Year of fee payment: 20

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 60207854

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20211201

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210531

REG Reference to a national code

Ref country code: GB

Ref legal event code: PE20

Expiry date: 20220509

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20220706

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20220509

Ref country code: ES

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20220511