EP2563891A1 - A stain repellence composition - Google Patents

A stain repellence composition

Info

Publication number
EP2563891A1
EP2563891A1 EP11712846A EP11712846A EP2563891A1 EP 2563891 A1 EP2563891 A1 EP 2563891A1 EP 11712846 A EP11712846 A EP 11712846A EP 11712846 A EP11712846 A EP 11712846A EP 2563891 A1 EP2563891 A1 EP 2563891A1
Authority
EP
European Patent Office
Prior art keywords
composition
substrate
metal ion
fabric
transition metal
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.)
Withdrawn
Application number
EP11712846A
Other languages
German (de)
French (fr)
Inventor
Somnath Das
Kingshuk Dutta
Amitava Pramanik
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.)
Unilever PLC
Unilever NV
Original Assignee
Unilever PLC
Unilever 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 Unilever PLC, Unilever NV filed Critical Unilever PLC
Publication of EP2563891A1 publication Critical patent/EP2563891A1/en
Withdrawn legal-status Critical Current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
    • C11D3/02—Inorganic compounds ; Elemental compounds
    • C11D3/04—Water-soluble compounds
    • C11D3/046—Salts
    • 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
    • C11D3/02—Inorganic compounds ; Elemental compounds
    • C11D3/04—Water-soluble compounds
    • C11D3/046—Salts
    • C11D3/048—Nitrates or nitrites
    • 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
    • C11D3/168—Organometallic compounds or orgometallic complexes
    • 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
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/02—Inorganic compounds
    • C11D7/04—Water-soluble compounds
    • C11D7/10—Salts
    • 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
    • C11D7/00—Compositions of detergents based essentially on non-surface-active compounds
    • C11D7/02—Inorganic compounds
    • C11D7/04—Water-soluble compounds
    • C11D7/10—Salts
    • C11D7/105—Nitrates; Nitrites
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M11/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising
    • D06M11/58—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with nitrogen or compounds thereof, e.g. with nitrides
    • D06M11/59—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with nitrogen or compounds thereof, e.g. with nitrides with ammonia; with complexes of organic amines with inorganic substances
    • D06M11/62—Complexes of metal oxides or complexes of metal salts with ammonia or with organic amines
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
    • D06M13/10—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing oxygen
    • D06M13/184—Carboxylic acids; Anhydrides, halides or salts thereof
    • D06M13/188—Monocarboxylic acids; Anhydrides, halides or salts thereof
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
    • D06M13/322—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing nitrogen
    • D06M13/325—Amines
    • D06M13/332—Di- or polyamines

Definitions

  • the present invention relates to a stain repellence composition for treating a substrate. More particularly the present invention relates to a composition for hydrophilic stain repellence and process for making a substrate repellent to hydrophilic stains.
  • next time cleaning benefit any treatment of a substrate prior to the deposition of dirt that enables easier cleaning upon the subsequent cleaning.
  • compositions for the treatment of hard and soft surfaces e.g. kitchen tops, tiles, carpets, upholstery, windows, including car windscreens, etc
  • hard and soft surfaces e.g. kitchen tops, tiles, carpets, upholstery, windows, including car windscreens, etc
  • Fabrics need to be cleaned from time to time depending on the perception of the cleanliness of the consumers.
  • washing a fabric causes fabric damage.
  • the damage of the fabric leads to the weariness and which subsequently leads to the older appearance of the fabric.
  • One of the ways of keeping fabrics clean is not to expose it to the environment which will eventually make the fabric dirty. Less dirty the fabric is the frequency of washing will also be less. Due to reduced frequency of fabric washing the weariness will also be less and the fabrics will become long lasting.
  • WO 91/04305 discloses an aqueous water repellent composition
  • an aqueous water repellent composition comprising the reaction product of one or more of a carboxylic acid or anhydride containing from 3 to 22 carbon atoms and a polyfunctional aromatic or aliphatic amine or substituted amine containing from 2 to 25 carbon atoms and a water soluble metal complex crosslinking agent containing one or more metals selected from Groups la, I la, Ilia, IVa and the first and second rows of transition metals from the Periodic Table of Elements.
  • the composition may contain wax and is dispersed in water to form a water repellent system.
  • GB 849275 discloses an anti-fungal composition for treating fabrics comprises an aqueous solution containing a thermosetting aminoplastic resin and a water-soluble complex of 8-hydroxyquinoline with copper and chromium.
  • GB 844985 discloses a method for treating a substrate or surface to render it water repellent and hydrophobic, using a/o complexes with Manganese. Simlarly US 5733341 discloses Manganese chloride complexes.
  • HMTA hexamethylene tetramine
  • composition for treating a substrate comprising:
  • the molar ratio of bivalent transition metal ion to hexamethylene tetramine is in the range of 2:1 to 1 :10 and the molar ratio of trivalent or tetravalent metal ion to bivalent transition metal ion is in the range of 10:1 to 1 :10.
  • the present invention provides a process for making a substrate hydrophilic stain repellence comprising the steps of (a) spraying the composition of the invention on a substrate, (b) drying the substrate.
  • the invention provides the use of the composition according to the invention to make a substrate hydrophobic.
  • hydrophilic stain repellence in the present invention is meant that, the composition according to the invention will make a substrate hydrophobic. Due to the enhanced hydrophobicity of the substrate, it will not attract any hydrophilic material therefore becomes repellent to hydrophilic stains.
  • the composition comprises a preformed bivalent transition metal ion complex or its separate precursors comprising of a bivalent transition metal ion and HMTA.
  • transition metal here we mean the d- block element of the periodic table which includes groups 3 to 12 on the periodic table.
  • the preferable bivalent transition metal includes Zinc, Copper, Manganese, Iron (II), Cobalt or Nickel or the mixtures thereof.
  • the present inventors have also found that apart from transition metal Magnesium can also be used for the purpose of the invention.
  • a preformed complex of bivalent transition metal ion with Hexamethylene tetramine is being added to the composition.
  • Bivalent transition metal ion is known to form complex with Hexamethylene tetramine.
  • Hexamethylene tetramine (HMTA) or Hexamine or Urotropin is a known organic ligand for complexation reaction. It is an organic heterocyclic compound having the formula (CH 2 )6N 4 having the following structure:
  • composition of the invention also contains a trivalent or tetravalent metal salt, or mixtures thereof.
  • the preferable trivalent cation of said salt includes Aluminum, Titanium (III), Chromium or iron (III) or mixtures thereof. These trivalent ions are preferably added to the composition in the form of their salts. If the trivalent metal ion is Aluminum the counter ion is preferably selected from chloride, nitrate, acetate or formate or mixtures thereof. The most preferable trivalent salts are selected from Aluminum chloride, Titanium (III) chloride, Ferric chloride, Chromium chloride, Aluminum nitrate, Chromium nitrate, Ferric nitrate.
  • the preferred tetravalent metal ion is selected from Titanium (IV) or Zirconium.
  • the preferred salt of the tetravalent metal ion is selected from Titanium (IV) chloride or Zirconium chloride.
  • hydrophilic stain repellence composition comprising a preformed bivalent transition metal ion complex or its separate precursors comprising; (i) a bivalent transition metal ion or Magnesium ion; and (ii) hexamethylene tetramine and a tri or tetravalent metal salt.
  • the bivalent metal ion complex of HMTA may be directly added to the composition or bivalent metal salt and HMTA may be separately added to the composition.
  • a ready to use liquid hard surface treatment composition comprises 1 - 80 g/L of the composition according to the invention dissolved in the solvent; more preferably at least 2 g/L or even at least 5 g/L, while preferably less than 40 g/L or even less than 25 g/L.
  • Such compositions are typically packaged in the form of a trigger 20 spray dispenser.
  • compositions may be in the form of solid or liquid compositions.
  • Solid compositions typically comprise at least 50% by weight, more preferably at least
  • composition for treating a substrate according to the invention 25 70%, still more preferably at least 80%, even more preferably at least 90%, or even up to 100% by weight of the composition for treating a substrate according to the invention.
  • a liquid fabric care composition typically comprises 20-90% by weight of the
  • composition for treating a substrate according to the invention more preferably at least
  • the solvent is preferably water, or a lower alcohol, such as methanol, ethanol, propanol, preferably 2-propanol.
  • the liquid composition may be further stabilized and/or thickened in any conventional way.
  • compositions of the invention may also contain one or more optional ingredients, selected from pH buffering agents, perfume carriers, fluorescers, colorants, hydrotropes, antifoaming agents, antiredeposition agents, enzymes, optical brightening agents, opacifiers, anti-shrinking agents, anti-wrinkle agents, anti-spotting agents, germicides, fungicides, anti-corrosion agents, drape imparting agents, antistatic agents and ironing aids. It will be appreciated that the use of other ingredients in the composition is apparent for those skilled in the art.
  • the measured amount of selected bivalent metal ion salt may be dissolved in ethyl alcohol and measured amount of HMTA is also dissolved in ethyl alcohol to make almost saturated solutions.
  • the two different solutions are then added in a pool of ethyl alcohol.
  • the reaction mixture is stirred using a magnetic stirrer while adding the reagents. After the addition it is generally kept sometimes for ageing.
  • the precipitated complex then filtered and washed several times with ethyl alcohol. It is subsequently then dried.
  • the complex may also be formed in an aqueous medium, such as washing liquor.
  • the invention provides a process for making a substrate hydrophilic stain repellent comprising the steps of: (a) spraying the composition according to the invention on a substrate, and (b) drying the substrate.
  • the spaying step is just to ensure that the substrate is substantially coated by the composition of the invention. It will be appreciated that any other means apart from spraying, that give rise to substantial coating of the fabric with the composition are also included here.
  • the spraying step is followed by the drying step.
  • the drying step is carried out at an ambient temperature. Ambient temperature here means temperature around 20°C - 30°C. But, it also can be carried out at an elevated temperature or in an atmosphere having higher than ambient temperature.
  • the substrate can be additionally treated with a fatty acid solution to increase the degree of hydrophobicity.
  • the fatty acid solution may be sprayed in the same way as the composition of the invention.
  • the fatty acid for this purpose is preferably selected from saturated fatty acid soap having carbon chain length ranging from Ci2 to C 2 4 preferably from C12 to Ci 8 .
  • the most preferred fatty acid is selected from Laurie acid, Myristic acid and Stearic acid.
  • the fatty acid solution preferably prepared by dissolving the fatty acid in a solvent preferably alcohol.
  • the amount of fatty acid in the solvent is preferably in the range of 1 to 20 g/L more preferably 2-6 g/L.
  • moist ironing here we mean ironing with water sprinkle. Ironing the treated and treated fabric with sprinkle of water to produce particles on the fabric and it makes the surface of the fabric rough enough to add more hydrophobicity. It has been found that the degree of hydrophobicity is even higher in the moist-ironed fabric than the dried fabric. But in the absence of moist-ironing stage the dried fabrics are also adequately hydrophobic to repel hydrophilic stain. Moist ironing stage is preferable when the precursors of the HMTA complex added separately compared to when preformed complex is added.
  • the temperature of the moist ironing stage is preferably in between 60-1 10°C, more preferably from 70-105°C and most preferably from 85-100°C.
  • the temperature mentioned here is the temperature of the iron.
  • the intended use of the composition of the invention is to make a substrate hydrophobic to repel hydrophilic stain.
  • the substrate can be fabrics, textiles, kitchen tops, tiles, carpets, upholstery, windows, including car windscreens etc. Now the invention will be demonstrated by way of non-limiting examples. The examples are for illustration only and do not limit the scope of the invention in any manner.
  • Example 1 Comparison of hydrophobicity for treated and untreated fabrics
  • test used for the purpose of the invention determines a treated fabric's resistance to wetting by aqueous liquids. Drops of water-alcohol mixtures of varying surface tensions are placed on the fabric, and the extent of surface wetting is determined visually. This test provides an index of aqueous stain repellence.
  • the test solutions used for the experiment are as follows:
  • test fabric was placed face up on a glass microscopic slide. Beginning with Test Liquid No. 0, 10 microlitre droplet of the solution was placed on the test fabric. The drop was observed for 10 seconds from an approximate 45° angle. If the droplet did not wet the fabrics then the next mixture solution was added in the same manner. The fabric's water repellency rating was the highest numbered liquid for which at the droplet did not wet or wick into the fabric. The results are shown in the following table:
  • the amount of (A), (B), (C) are 500 mg, 450 mg and 190 mg respectively.
  • the treatment solutions were made by dissolving the described amount of (A), (B), (C) in 100 ml of water.
  • Example 2 Comparison of hvdrophobicity of the treated and untreated fabric wherein the precursors were added separately but not as a complex
  • the amount of Zinc Nitrate hexahydrate, Manganese Nitrate tetrahydrate, Copper Nitrate trihydrate, Magnesium Nitrate hexahydrate, HMTA and Aluminium nitrate are respectively 294 mg, 248 mg, 254 mg, 239 mg, 278 mg and 190 mg.
  • the treatment solutions were made by dissolving the described amount of the ingredients in 100 ml of water.
  • Example 3 Comparison of hydrophobicity of the treated and untreated surface other than fabric.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Textile Engineering (AREA)
  • Paints Or Removers (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)

Abstract

This invention relates to a stain repellence composition for treating a substrate. More particularly the present invention relates to a composition for hydrophilic stain repellence and process for making a substrate repellent to hydrophilic stains. It is an object of the present invention to provide a composition that renders a substrate hydrophobic; and thereby make a substrate hydrophilic stain repellent. It has been found that, hexamethylenetetramine (HMTA) complexed with bivalent transition metal ion in presence of trivalent and/or tetravalent metal ion in an aqueous medium can act as a hydrophilic stain repellence composition on the substrate and can make the substrate hydrophobic.

Description

A STAIN REPELLENCE COMPOSITION
Field of the Invention The present invention relates to a stain repellence composition for treating a substrate. More particularly the present invention relates to a composition for hydrophilic stain repellence and process for making a substrate repellent to hydrophilic stains.
Background and Prior Art
Any discussion of the prior art throughout the specification should in no way be considered as an admission that such prior art is widely known or forms part of the common general knowledge in the field. Present days consumers are not only looking for fabric washing composition to remove the dirt. But, they are also looking for fabric treatment composition before-wash or after-wash to keep the fabric better and long-lasting. Different types of fabric care/treatment compositions are known in the art. Fabric care compositions serve a variety of purposes. The use of a fabric care composition is one of the ways to deliver and deposit different types of benefit agents onto the fabrics.
Fabric cleaning or care compositions that provide a so called next time cleaning benefit, are highly appreciated by present day consumers. By next time cleaning benefit is meant any treatment of a substrate prior to the deposition of dirt that enables easier cleaning upon the subsequent cleaning.
Similarly there is a need for compositions for the treatment of hard and soft surfaces (e.g. kitchen tops, tiles, carpets, upholstery, windows, including car windscreens, etc) that render the surfaces hydrophobic and/or repellent to aqueous stains.
Fabrics need to be cleaned from time to time depending on the perception of the cleanliness of the consumers. However, washing a fabric causes fabric damage. The more often a garment is washed, the more is the damage to the fabric. The damage of the fabric leads to the weariness and which subsequently leads to the older appearance of the fabric. One of the ways of keeping fabrics clean is not to expose it to the environment which will eventually make the fabric dirty. Less dirty the fabric is the frequency of washing will also be less. Due to reduced frequency of fabric washing the weariness will also be less and the fabrics will become long lasting.
Coating compositions using different fabric compatible polymers to reduce the dirt on the fabric have been disclosed in the art.
WO 91/04305 discloses an aqueous water repellent composition comprising the reaction product of one or more of a carboxylic acid or anhydride containing from 3 to 22 carbon atoms and a polyfunctional aromatic or aliphatic amine or substituted amine containing from 2 to 25 carbon atoms and a water soluble metal complex crosslinking agent containing one or more metals selected from Groups la, I la, Ilia, IVa and the first and second rows of transition metals from the Periodic Table of Elements. The composition may contain wax and is dispersed in water to form a water repellent system.
GB 849275 discloses an anti-fungal composition for treating fabrics comprises an aqueous solution containing a thermosetting aminoplastic resin and a water-soluble complex of 8-hydroxyquinoline with copper and chromium.
GB 844985 discloses a method for treating a substrate or surface to render it water repellent and hydrophobic, using a/o complexes with Manganese. Simlarly US 5733341 discloses Manganese chloride complexes.
However, a composition which will make fabrics and/or surfaces hydrophobic and therefore will repel stains which are hydrophilic in nature, remains to be desired.
Objects of the invention
In view of the foregoing, it is an object of the present invention to provide a composition that renders a substrate hydrophobic; and thereby make a substrate hydrophilic stain repellent. It is another object of the invention to provide fabrics/textiles resistant to getting dirty.
Surprisingly it has now been found that, hexamethylene tetramine (HMTA) complexed with bivalent transition metal ion in presence of trivalent and/or tetravalent metal ion in an aqueous medium can act as a hydrophilic stain repellence composition on the substrate and can make the substrate hydrophobic.
Summary of the invention Accordingly, the present invention provides a composition for treating a substrate comprising:
a) a preformed bivalent transition metal ion complex or its separate precursors comprising :
i. a bivalent transition metal ion or a Magnesium ion; and
ii. hexamethylenetetramine
b) a tri- or tetravalent metal salt,
wherein the molar ratio of bivalent transition metal ion to hexamethylene tetramine is in the range of 2:1 to 1 :10 and the molar ratio of trivalent or tetravalent metal ion to bivalent transition metal ion is in the range of 10:1 to 1 :10.
In another aspect, the present invention provides a process for making a substrate hydrophilic stain repellence comprising the steps of (a) spraying the composition of the invention on a substrate, (b) drying the substrate.
In another aspect the invention provides the use of the composition according to the invention to make a substrate hydrophobic.
By the term hydrophilic stain repellence in the present invention is meant that, the composition according to the invention will make a substrate hydrophobic. Due to the enhanced hydrophobicity of the substrate, it will not attract any hydrophilic material therefore becomes repellent to hydrophilic stains.
These and other aspects, features and advantages will become apparent to those of ordinary skill in the art from a reading of the following detailed description. For the avoidance of doubt, any feature of one aspect of the present invention may be utilised in any other aspect of the invention. The word "comprising" is intended to mean "including" but not necessarily "consisting of" or "composed of." In other words, the listed steps or options need not be exhaustive. It is noted that the examples given in the description below are intended to clarify the invention and are not intended to limit the invention to those examples per se. Similarly, all percentages are weight/weight percentages unless otherwise indicated. Except in the operating and comparative examples, or where otherwise explicitly indicated, all numbers in this description indicating amounts of material or conditions of reaction, physical properties of materials and/or use are to be understood as modified by the word "about". Numerical ranges expressed in the format "from x to y" are understood to include x and y. When for a specific feature multiple preferred ranges are described in the format "from x to y", it is understood that all ranges combining the different endpoints are also contemplated.
Detailed description of the invention
According to the present invention the composition comprises a preformed bivalent transition metal ion complex or its separate precursors comprising of a bivalent transition metal ion and HMTA. By mentioning transition metal here we mean the d- block element of the periodic table which includes groups 3 to 12 on the periodic table. The preferable bivalent transition metal includes Zinc, Copper, Manganese, Iron (II), Cobalt or Nickel or the mixtures thereof. The present inventors have also found that apart from transition metal Magnesium can also be used for the purpose of the invention. According to one aspect of the invention a preformed complex of bivalent transition metal ion with Hexamethylene tetramine is being added to the composition. Bivalent transition metal ion is known to form complex with Hexamethylene tetramine.
Hexamethylene tetramine (HMTA) or Hexamine or Urotropin is a known organic ligand for complexation reaction. It is an organic heterocyclic compound having the formula (CH2)6N4 having the following structure:
It is soluble in water and most of the polar organic solvents. It is a well known compound in complex chemistry for its ability to form complex with divalent transition metals like Zinc, Copper, Nickel etc. Hexamine undergoes hydrolysis at a temperature of 90-100 degree centigrade.
The preferable salts of bivalent metal ion for the purpose of complexation is selected from Zinc Nitrate, Zinc chloride, Copper nitrate, Manganese nitrate, Ferrous nitrate, Cobalt nitrate, Copper (ii) chloride, Manganese Chloride, Ferrous chloride.
In case where Magnesium is used the corresponding salt is selected from Magnesium chloride, Magnesium nitrate etc.
The composition of the invention also contains a trivalent or tetravalent metal salt, or mixtures thereof.
The preferable trivalent cation of said salt includes Aluminum, Titanium (III), Chromium or iron (III) or mixtures thereof. These trivalent ions are preferably added to the composition in the form of their salts. If the trivalent metal ion is Aluminum the counter ion is preferably selected from chloride, nitrate, acetate or formate or mixtures thereof. The most preferable trivalent salts are selected from Aluminum chloride, Titanium (III) chloride, Ferric chloride, Chromium chloride, Aluminum nitrate, Chromium nitrate, Ferric nitrate.
The preferred tetravalent metal ion is selected from Titanium (IV) or Zirconium. The preferred salt of the tetravalent metal ion is selected from Titanium (IV) chloride or Zirconium chloride. Thus the present invention provides hydrophilic stain repellence composition comprising a preformed bivalent transition metal ion complex or its separate precursors comprising; (i) a bivalent transition metal ion or Magnesium ion; and (ii) hexamethylene tetramine and a tri or tetravalent metal salt.
5
The preferable molar ratio of bivalent transition metal ion to hexamethylene tetramine is in the range of 2:1 to 1 :10 and the preferable molar ratio of trivalent or tetravalent metal ion to bivalent transition metal ion is in the range of 10:1 to 1 :10. The most preferable range of the molar ratio of trivalent or tetravalent metal ion to bivalent transition metal 10 ion to hexamethylene tetramine is about 1 :2:4.
According to the present invention the bivalent metal ion complex of HMTA may be directly added to the composition or bivalent metal salt and HMTA may be separately added to the composition.
15
Preferably a ready to use liquid hard surface treatment composition comprises 1 - 80 g/L of the composition according to the invention dissolved in the solvent; more preferably at least 2 g/L or even at least 5 g/L, while preferably less than 40 g/L or even less than 25 g/L. Such compositions are typically packaged in the form of a trigger 20 spray dispenser.
For fabric care, the compositions may be in the form of solid or liquid compositions.
Solid compositions typically comprise at least 50% by weight, more preferably at least
25 70%, still more preferably at least 80%, even more preferably at least 90%, or even up to 100% by weight of the composition for treating a substrate according to the invention.
A liquid fabric care composition typically comprises 20-90% by weight of the
30 composition for treating a substrate according to the invention, more preferably at least
50%, still more preferably at least 60%, but preferably less than 85%, more preferably less than 80% in a solvent. The solvent is preferably water, or a lower alcohol, such as methanol, ethanol, propanol, preferably 2-propanol. The liquid composition may be further stabilized and/or thickened in any conventional way.
Optional ingredients
The compositions of the invention may also contain one or more optional ingredients, selected from pH buffering agents, perfume carriers, fluorescers, colorants, hydrotropes, antifoaming agents, antiredeposition agents, enzymes, optical brightening agents, opacifiers, anti-shrinking agents, anti-wrinkle agents, anti-spotting agents, germicides, fungicides, anti-corrosion agents, drape imparting agents, antistatic agents and ironing aids. It will be appreciated that the use of other ingredients in the composition is apparent for those skilled in the art.
Forming the complex
To form complex with hexamethylene tetramine the measured amount of selected bivalent metal ion salt may be dissolved in ethyl alcohol and measured amount of HMTA is also dissolved in ethyl alcohol to make almost saturated solutions. The two different solutions are then added in a pool of ethyl alcohol. The reaction mixture is stirred using a magnetic stirrer while adding the reagents. After the addition it is generally kept sometimes for ageing. The precipitated complex then filtered and washed several times with ethyl alcohol. It is subsequently then dried.
The complex may also be formed in an aqueous medium, such as washing liquor.
Treating a substrate
In another aspect the invention provides a process for making a substrate hydrophilic stain repellent comprising the steps of: (a) spraying the composition according to the invention on a substrate, and (b) drying the substrate. The spaying step is just to ensure that the substrate is substantially coated by the composition of the invention. It will be appreciated that any other means apart from spraying, that give rise to substantial coating of the fabric with the composition are also included here. The spraying step is followed by the drying step. According to one of the preferred aspect of the present invention the drying step is carried out at an ambient temperature. Ambient temperature here means temperature around 20°C - 30°C. But, it also can be carried out at an elevated temperature or in an atmosphere having higher than ambient temperature.
For the avoidance of doubt, the submersion of fabric in water comprising the substrate treatment composition is included in the scope of this invention.
Optionally after drying the substrate can be additionally treated with a fatty acid solution to increase the degree of hydrophobicity. The fatty acid solution may be sprayed in the same way as the composition of the invention. The fatty acid for this purpose is preferably selected from saturated fatty acid soap having carbon chain length ranging from Ci2 to C24 preferably from C12 to Ci8. The most preferred fatty acid is selected from Laurie acid, Myristic acid and Stearic acid. The fatty acid solution preferably prepared by dissolving the fatty acid in a solvent preferably alcohol. The amount of fatty acid in the solvent is preferably in the range of 1 to 20 g/L more preferably 2-6 g/L.
After the above treatment, if the substrate is a fabric, then it can be optionally moist ironed. By mentioning moist ironing here we mean ironing with water sprinkle. Ironing the treated and treated fabric with sprinkle of water to produce particles on the fabric and it makes the surface of the fabric rough enough to add more hydrophobicity. It has been found that the degree of hydrophobicity is even higher in the moist-ironed fabric than the dried fabric. But in the absence of moist-ironing stage the dried fabrics are also adequately hydrophobic to repel hydrophilic stain. Moist ironing stage is preferable when the precursors of the HMTA complex added separately compared to when preformed complex is added.
The temperature of the moist ironing stage is preferably in between 60-1 10°C, more preferably from 70-105°C and most preferably from 85-100°C. The temperature mentioned here is the temperature of the iron. The intended use of the composition of the invention is to make a substrate hydrophobic to repel hydrophilic stain. The substrate can be fabrics, textiles, kitchen tops, tiles, carpets, upholstery, windows, including car windscreens etc. Now the invention will be demonstrated by way of non-limiting examples. The examples are for illustration only and do not limit the scope of the invention in any manner.
Examples:
Example 1 : Comparison of hydrophobicity for treated and untreated fabrics
The test used for the purpose of the invention, determines a treated fabric's resistance to wetting by aqueous liquids. Drops of water-alcohol mixtures of varying surface tensions are placed on the fabric, and the extent of surface wetting is determined visually. This test provides an index of aqueous stain repellence. The test solutions used for the experiment are as follows:
2.7g of fabric (10 X 10 cm2) was separately dipped in the above mentioned sets of solutions for 2 hours each. Then the fabrics were removed from the solutions and dried in air. The dried fabrics were cut into two pieces. One portion of the fabric was ironed after sprinkling water on it at a temperature of ~ 105°C till the fabrics were dry.
In this process the test fabric was placed face up on a glass microscopic slide. Beginning with Test Liquid No. 0, 10 microlitre droplet of the solution was placed on the test fabric. The drop was observed for 10 seconds from an approximate 45° angle. If the droplet did not wet the fabrics then the next mixture solution was added in the same manner. The fabric's water repellency rating was the highest numbered liquid for which at the droplet did not wet or wick into the fabric. The results are shown in the following table:
In the above experiment the amount of (A), (B), (C) are 500 mg, 450 mg and 190 mg respectively. The treatment solutions were made by dissolving the described amount of (A), (B), (C) in 100 ml of water.
Example 2: Comparison of hvdrophobicity of the treated and untreated fabric wherein the precursors were added separately but not as a complex
The same procedure as discussed in the Example 1 was used for this purpose:
Fabric Treatment drop test no. (With
drying + Moist Ironing)
Zinc Nitrate hexa hydrate + HMTA 0
Zinc Nitrate hexahydrate + HMTA + 1
Aluminium nitrate
Manganese Nitrate tetrahydrate + HMTA 0
Manganese Nitrate hexa-hydrate + HMTA+ 2
Aluminium nitrate
Copper Nitrate trihydrate + HMTA 0 Copper Nitrate trihydrate + HMTA + 2
Aluminium nitrate
Magnesium Nitrate hexahydrate + HMTA 0
Magnesium Nitrate hexahydrate + HMTA+ 1
Aluminium nitrate
In the above example the amount of Zinc Nitrate hexahydrate, Manganese Nitrate tetrahydrate, Copper Nitrate trihydrate, Magnesium Nitrate hexahydrate, HMTA and Aluminium nitrate are respectively 294 mg, 248 mg, 254 mg, 239 mg, 278 mg and 190 mg. The treatment solutions were made by dissolving the described amount of the ingredients in 100 ml of water.
Example 3: Comparison of hydrophobicity of the treated and untreated surface other than fabric.
500 mg of Zn-HMTA complex of probable formulae and 190 mg Aluminum nitrate monohydrate was dissolved in 100 ml of distilled water. 5 ml of the solution was added to a clean glass slide/ stainless steel plate, spread over the surface, left for 5 minutes and then wiped off with a tissue paper till completely dry. The contact angle of a 20 microlitre of water droplet was measured on the treated and the untreated surfaces.
Contact angle (in degree):
Type of Surface Treated with the composition Untreated
Glass 72 21
Stainless steel 79 65 From the table it is apparent that after the treatment the contact angle is increased. The higher the contact angle the more hydrophobic the surface is. So there is an increase in the hydrophobicity of the treated surface.

Claims

A composition for treating a substrate comprising:
a) a preformed bivalent transition metal ion complex or its separate precursors comprising
i. a bivalent transition metal ion or Magnesium ion; and
ii. hexamethylene-tetramine
b) a tri- or tetravalent metal salt, wherein the molar ratio of bivalent transition metal ion to hexamethylenetetramine is in the range of 2:1 to 1 :10 and the molar ratio of trivalent or tetravalent metal ion to bivalent transition metal ion is in the range of 10:1 to 1 :10.
A composition as claimed in claim 1 wherein the metal part of the bivalent transition metal ion salt is selected from Zinc, Copper(ll), Manganese, Iron(ll), Cobalt or Nickel or the mixtures thereof.
A composition as claimed in claim 1 wherein the metal part of the trivalent metal salt is selected from Aluminum, Titanium (III), Chromium or iron (III) or mixtures thereof.
A composition as claimed in claim 3 wherein, if the metal cation is Aluminum the counter anion is selected from chloride, nitrate, acetate or mixtures thereof.
A composition as claimed in claim 1 wherein the tetravalent metal salt is selected from Titanium (IV) or Zirconium.
A solid laundry treatment composition comprising at least 50% by weight of the composition for treating a substrate according to anyone of claims 1 to 5.
A liquid hard surface treating composition:
(a) 1 - 80 g/L of the composition according to any one of the claims 1 to 5; and
(b) a solvent. A liquid laundry treatment composition comprising
a) 20-90% by weight of the composition for treating a substrate according to anyone of claims 1 to 5
b) A solvent.
A composition as claimed in anyone of claims 7 or 8 wherein the solvent is water or lower alcohol.
A process for making a substrate hydrophilic stain repellence comprising the steps of:
a) Spraying the composition according to any one of the preceding claim on a substrate; and
b) drying the substrate,
A process for making substrate hydrophilic stain repellence as claimed in claim 10 further comprises treating the substrate with a fatty acid solution.
A process as claimed in claim 1 1 wherein the fatty acid is selected from a saturated fatty acid having carbon chain length C12 - C24.
A process for making substrate hydrophilic stain repellence as claimed in claim 10, 1 1 or 12 further comprises moist ironing the dried substrate if the substrate is fabric.
A process for making fabric hydrophilic stain repellence as claim in claim 13 wherein the temperature of the moist ironing stage is in between 60-1 10 °C of the iron temperature..
The use of a composition according to any one of the preceding claims 1 to 9 to make a fabric hydrophobic.
EP11712846A 2010-04-30 2011-04-05 A stain repellence composition Withdrawn EP2563891A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IN1372MU2010 2010-04-30
EP10168995 2010-07-09
PCT/EP2011/055261 WO2011134755A1 (en) 2010-04-30 2011-04-05 A stain repellence composition

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EP2563891A1 true EP2563891A1 (en) 2013-03-06

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WO (1) WO2011134755A1 (en)

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EP2809757B1 (en) 2012-01-31 2016-04-27 Unilever N.V. A composition and method for treating substrates

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GB849275A (en) 1955-11-25 1960-09-21 Cfmc New water-soluble complexes of 8-hydroxy-quinoline and a process for their preparation
NL229931A (en) 1957-07-26
GB8921041D0 (en) 1989-09-16 1989-11-01 Rtz Chemicals Ltd Water-borne water repellents and their use
GB9425296D0 (en) 1994-12-15 1995-02-15 Ciba Geigy Ag Inhibition of dye migration

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Title
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