WO1999061572A1 - Procede et produit de traitement pour tisses - Google Patents

Procede et produit de traitement pour tisses Download PDF

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Publication number
WO1999061572A1
WO1999061572A1 PCT/EP1999/003587 EP9903587W WO9961572A1 WO 1999061572 A1 WO1999061572 A1 WO 1999061572A1 EP 9903587 W EP9903587 W EP 9903587W WO 9961572 A1 WO9961572 A1 WO 9961572A1
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WO
WIPO (PCT)
Prior art keywords
optionally
product
bleach
fabrics
particulate composition
Prior art date
Application number
PCT/EP1999/003587
Other languages
English (en)
Inventor
Machiel Goedhart
Jean-Paul Janssens
Original Assignee
Unilever Plc
Unilever N.V.
Hindustan Lever Limited
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
Priority claimed from GBGB9811633.8A external-priority patent/GB9811633D0/en
Application filed by Unilever Plc, Unilever N.V., Hindustan Lever Limited filed Critical Unilever Plc
Priority to BR9910766-0A priority Critical patent/BR9910766A/pt
Priority to AU41461/99A priority patent/AU4146199A/en
Publication of WO1999061572A1 publication Critical patent/WO1999061572A1/fr

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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
    • C11D3/39—Organic or inorganic per-compounds
    • C11D3/3945—Organic per-compounds
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
    • C11D17/04—Detergent materials or soaps characterised by their shape or physical properties combined with or containing other objects
    • C11D17/041—Compositions releasably affixed on a substrate or incorporated into a dispensing means
    • C11D17/042—Water soluble or water disintegrable containers or substrates containing cleaning compositions or additives for cleaning compositions
    • 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
    • C11D3/395—Bleaching agents
    • C11D3/3953—Inorganic bleaching agents
    • 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
    • C11D3/395—Bleaching agents
    • C11D3/3955—Organic bleaching agents
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
    • D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
    • D06L4/10—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen
    • D06L4/12—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which develop oxygen combined with specific additives
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
    • D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
    • D06L4/20—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which contain halogen
    • D06L4/22—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which contain halogen using inorganic agents
    • D06L4/23—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using agents which contain halogen using inorganic agents using hypohalogenites
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06L—DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS, YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; BLEACHING LEATHER OR FURS
    • D06L4/00—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs
    • D06L4/40—Bleaching fibres, filaments, threads, yarns, fabrics, feathers or made-up fibrous goods; Bleaching leather or furs using enzymes

Definitions

  • the present invention is concerned with a process and product suitable for treating textile fabrics, especially white fabrics, to improve or restore whiteness.
  • the invention is especially concerned with the restoration or "rejuvenation" of white fabrics that have become grey from repeated soiling and laundering.
  • the greying of white fabrics after several wash/wear cycles is a major problem in the Indian subcontinent.
  • the causes include a high level of environmental soil in the atmosphere, calcium deposits originating from the wash process itself, and the use of blueing agents in the wash. These blueing agents, which are sulphonated conjugated molecules or coloured clay-type materials, are deposited on the fabric and accumulate during repeated washes.
  • White fabrics rapidly lose their new appearance after only a small number of wash/wear cycles and take on an unattractive grey appearance. This problem is exacerbated by the high level of sooty particulate soil in the atmosphere.
  • Other sources of greying are fatty soil, for example sebum, skin cells, melanin, calcium soap deposits, clay soil, and iron oxides. A similar dulling phenomenon has been noted with coloured fabrics. Further washing with the detergent products currently on the market merely appears to increases the problem further.
  • the present inventors have therefore sought to develop a process and product by means of which whiteness can be restored to a high level, preferably in a single treatment, and by means of which a high level of whiteness can be maintained over many wash/wear cycles.
  • the process and product of the invention if used on new fabrics, can also prevent or reduce the greying or dulling effect, so that a new appearance is maintained from the start.
  • JP 58 008 180A discloses a process for removing coloured disinfectant stains from hospital clothing, in which the clothing is first machine-washed in an acid solution at pH 2.5-4.0, for example at 60°C, then machine- washed with a solution containing sodium hypochlorite bleach, for example at 40°C.
  • the preferred acid for the first step is phosphoric acid, but citric acid may also be used.
  • the acid solution used for the first step may contain a neutral detergent .
  • GB 2 095 254A discloses a composition for reducing discolouration of textiles during washing or dry cleaning, the composition comprising tertiary amine salts of citric acid or tricarballylic acid.
  • WO 96 21714A discloses a process for improving the colour fidelity of coloured and white fabrics, which comprises rinsing the fabrics in water containing a chelating agent for copper or nickel ions plus a chlorine scavenger.
  • the chelating agent is preferably ethylenediamine disuccinate.
  • the chlorine scavenger is preferably ammonium chloride or a primary or secondary amine .
  • WO 97 28207A and WO 97 28208A disclose heavy metal ion control agents for use in laundry detergent compositions, to prevent the fading of coloured fabric and the build up of yellow or grey colour on white fabric.
  • the heavy metal ion control agents are modified polyamines .
  • JP 61 062 600A discloses a detergent composition for preventing the yellowing of fabrics due to ferrous ions, comprising citric acid, isocitric acid or their salts plus optionally polyethylene glycol , surfactants, builders, bleaches and other conventional ingredients.
  • EP 534 525A discloses a granular detergent composition containing particulate citric acid, plus anionic and/or nonionic surfactants, sodium carbonate, other builder, and preferably also foam depressing agent and bleach components.
  • the present invention provides a process for the treatment of textile fabrics to improve, restore or maintain whiteness, which comprises the steps of:
  • the invention further provides a product for the treatment of textile fabrics to improve, restore or maintain whiteness, comprising two separately packaged particulate compositions, wherein: the first particulate composition (i) comprises
  • the present invention further provides a product for the treatment of textile fabrics to improve, restore or maintain whiteness, comprising two separately packaged particulate compositions, wherein:
  • the first particulate composition (i) has a pH (of a 1% solution in demineralised water at 25°C) of less than 5 and comprises :
  • Fe ions and (i) (b) optionally from 0 to 30 wt% of a surfactant; (i) (c) optionally from 0 to 10 wt% of an oxidising agent capable of masking and/or neutralising sulphurous odours , (i) (d) optionally from 0 to 10 wt% of a bleach stable and effective at a pH below 5.0, and other minor ingredients to 100 wt%,
  • the second particulate composition (ii) comprises (ii) (a) from 1 to 100 wt% of a bleach, (ii) (b) optionally from 0 to 30 wt% of a surfactant, (ii) (c) optionally from 0 to 99 wt% of an alkaline buffering agent, (ii) (d) optionally from 0 to 50 wt% of one or more builder and/or filler salts, (ii) (e) optionally from 0 to 5 wt% of a sequestrant bleach stabiliser, (ii) (f) optionally from 0 to 5 wt% of a fluorescer, (ii) (g) optionally an effective amount of one or more detergent enzymes, and other minor ingredients to 100 wt%.
  • the first aspect of the invention is a wet treatment process.
  • the fabrics are soaked successively in two different aqueous liquors and then rinsed.
  • the fabrics may be rinsed between the two soaking steps.
  • a preferred process in accordance with the present invention comprises the steps of : (i) allowing the fabrics to soak for at least 1 minute in a first aqueous liquor having a pH not exceeding 5.0 and comprising
  • a second aqueous liquor comprising (ii) (a) a bleach, (ii) (b) optionally a surfactant, (ii) (c) optionally an alkaline buffering agent,
  • the treatment may be carried out on either clean or soiled fabrics.
  • the treatment itself can incorporate laundering to a greater or lesser degree, depending on the amounts of surfactants and other cleaning ingredients present in the two aqueous liquors, and it may be employed either instead of, or in addition to, conventional laundering.
  • the treatment is carried out in addition to conventional laundering, and the fabrics are clean.
  • the process of the invention is especially useful, as a supplement to the normal laundry process, for the restoration or "rejuvenation" of white fabrics that have become grey. It has been found that the reflectance of greyed fabrics treated by the process of the invention can be very substantially increased. For example, when the process is applied to greyed fabrics having an initial reflectance at 460 nm, R(460*), no greater than 65, an increase in reflectance at 460 nm, ⁇ R(460*), of at least 6, preferably at least 10, units has been achieved over five treatments. Even greater increases may be observed in reflectances at 600 nm.
  • the process of the invention may also be used to maintain the whiteness of new fabric and prevent the greying process. Although intended primarily for the treatment of white fabrics, the process of the invention may also be useful for restoring or maintaining the colour fidelity of coloured fabrics .
  • the process of the invention is suitable for carrying out by hand, using simple utensils such as buckets or bowls as are usually used in laundering fabrics by hand. However, the process may also be carried out by machine.
  • the second aspect of the invention is a product comprising two separately packaged particulate products which may be used to prepare the two aqueous liquors used in the process of the invention.
  • the first aqueous liquor used in the process of the invention.
  • the first aqueous liquor contains as an essential ingredient a material capable of converting deposited blueing agent to a colourless form, and a material (the same or a different material) capable of binding Fe ions, and advantageously capable also of binding Ca ions.
  • a material fulfilling both functions is used.
  • the material or combination of materials must be present in an effective amount.
  • the conversion of blueing agent (a sulphonated conjugated molecule or coloured clay-type material) to a colourless form may be effected by reduction.
  • the active ingredient in the first aqueous liquor is therefore preferably a reducing agent .
  • Suitable materials include water-soluble solid organic carboxylic acids, for example, citric acid, oxalic acid, tartaric acid, malonic acid, succinic acid, ascorbic acid, or water-soluble salts of these acids. Salts containing two or more carboxyl groups are especially preferred.
  • water-soluble solid acid salts such as sodium dihydrogen phosphate dihydrate, NaH 2 P0 4 .laq, or tetrabutylammonium hydrogen sulphate, (C 4 H 9 ) 4 N.HS0 , may be used.
  • Examples of some suitable acidic materials include the following :
  • the first aqueous liquor has a relatively low pH, lower than 5 , and advantageously in the range of from 3.5 to 4.5, most preferably about 4.0.
  • lower pH values for example, 2 to 3.5, are also within the scope of the invention.
  • the material (i) (a) is an organic acid used in admixture with a corresponding water-soluble salt, preferably a sodium salt.
  • the pH may then be controlled by choice of the ratio of free acid to salt.
  • a preferred material (i) (a) in accordance with the invention is a solid organic carboxylic acid, preferably containing two or more carboxyl groups, optionally in admixtures with a water-soluble salt thereof.
  • the preferred material (i) (a) for use in the present invention is citric acid, optionally and more preferably used in admixture with sodium citrate.
  • the concentration of the material (or combination of materials) (i) (a) in the first aqueous liquor is preferably at least 1 g/litre, and more preferably at least 3 g/litre.
  • the first aqueous liquor also contains an effective amount of an oxidising agent capable of masking and/or neutralising sulphurous odours.
  • an oxidising agent capable of masking and/or neutralising sulphurous odours.
  • odours may be generated when the blueing agent is converted to a colourless form.
  • Suitable materials are especially oxidative bleaches, preferably selected from alkali metal and alkaline earth metal iodates, peroxomonosulphates, benzenecarboperoxoates and monoperoxyphthalates, and hydrogen peroxide.
  • alkali metal iodates more especially potassium iodate .
  • the amount required to neutralise sulphurous odours may be determined by means of a lead acetate titration test, which is carried out as follows.
  • a monitor is prepared by impregnating a 1 cm x 10 cm strip of Whatman IPS phase- separating filter paper (silicone treated) with lead acetate solution (1 g of lead acetate trihydrate in 100 ml demineralised water) .
  • a fabric monitor is placed in 100 ml sample of the treatment liquor (first aqueous liquor) in a 400 ml beaker, the lead acetate strip is moistened with demineralised water and placed above the treatment liquor, and the beaker is closed with a transparent lid. If hydrogen sulphide is formed during the treatment, the lead acetate strip becomes black/brown due to the formation of lead sulphide, and this indicates that the liquor contains an insufficient amount of the oxidising agent.
  • the first aqueous liquor may contain a bleach stable and effective at a pH below 5.0.
  • stable and effective is meant that the bleach must be stable in a product on storage at a pH below 5.0, soluble when the product is dissolved in water, and function effectively as a bleach at the pH of the product.
  • odour- masking or odour-neutralising agents are also stable and effective bleaches at a pH below 5.0.
  • the chosen oxidising agent is, for example, potassium iodate, it may be preferred for an additional bleach stable at low pH also to be present.
  • Preferred bleaches are alkali metal dichlorocyanurates .
  • Materials that may function both as odour-masking or neutralising agents and as stable and effective bleaching agents at a pH below 5.0 include magnesium monoperoxyphthalate and potassium benzenecarboperoxoate .
  • the first aqueous liquor may also advantageously contain one or more surfactants.
  • Anionic and/or nonionic surfactants are preferred, especially anionic surfactants used alone and combinations of anionic and nonionic surfactants in which the anionic surfactant predominates .
  • a preferred surfactant system comprises an anionic surfactant selected from linear alkylbenzene sulphonate and alpha-olefin sulphonate, optionally together with at least one ethoxylated C 8 -C 2 o alcohol nonionic surfactant having an average degree of ethoxylation of from 2 to 10.
  • perfumes may be present, generally in minor amounts.
  • the fabrics are allowed to soak in the first aqueous liquor for at least 1 minute, preferably from 1 to 60 minutes, more preferably from 10 to 45 minutes, and most preferably from 15 to 30 minutes.
  • the fabrics are then allowed to soak in the second aqueous liquor.
  • the second aqueous liquor contains as an essential ingredient a bleach.
  • Other ingredients including surfactants and alkaline buffering agents may if desired be present, but that is not essential.
  • Suitable bleaches include chlorine bleaches such as alkali metal hypochlorite, organic chloramides (eg alkali metal dichlorocyanurate (DCCA) or trichlorocyanurate) ; peracids, for example, N,N' -phthaloylaminoperoxycaproic acid (PAP), diperdodecanoic acid (DPDA) ; inorganic persalts, for example, alkali metal perborate or percarbonate, together with a bleach activator (peracid precursor) such as alkylsulphophenyl carbonate (ASPC) , cholylsulphophenylcarbonate (CSPC) , or SNOBS and similar materials. If desired, two or more bleaches may be used in combination.
  • a bleach activator peracid precursor
  • Preferred bleaches are alkali metal hypochlorite, alkali metal dichlorocyanurate (DCCA) , alkali metal perborate, and N,N' -phthaloylaminoperoxycaproic acid (PAP), and combinations thereof.
  • Especially preferred bleaches are sodium DCCA, PAP, and combinations thereof.
  • the second aqueous liquor may also contain a bleach stabiliser (heavy metal sequestrant) , for example, an aminopolycarboxylate or aminopolyphosphonate .
  • a bleach stabiliser for example, an aminopolycarboxylate or aminopolyphosphonate .
  • Preferred materials include EDTA, NTA, EDDS, and EDTMP and DETPMP (Dequests (Trade Mark) ) .
  • a sequestrant is desirable or preferred when the bleach system includes PAP, but may be omitted if the bleach is NaDCCA.
  • the concentration of bleach in the second aqueous liquor is preferably at least 0.05 g/litre, more preferably at least 0.1 g/litre and most preferably at least 0.2 g/litre.
  • Surfactants may also be present. Especially preferred are anionic and/or nonionic surfactants. As in the first aqueous liquor, anionic surfactants alone and anionic/nonionic combinations in which the anionic surfactant predominates are preferred.
  • the second aqueous liquor may also contain an alkaline buffering agent, which may suitably be selected from sodium carbonate, sodium bicarbonate, sodium sesquicarbonate, sodium silicate and combinations of these. It may also contain one or more builder and/or filler salts, suitably selected from sodium tripolyphosphate, other sodium phosphates, sodium sulphate, and combinations of these.
  • an alkaline buffering agent which may suitably be selected from sodium carbonate, sodium bicarbonate, sodium sesquicarbonate, sodium silicate and combinations of these. It may also contain one or more builder and/or filler salts, suitably selected from sodium tripolyphosphate, other sodium phosphates, sodium sulphate, and combinations of these.
  • the second aqueous liquor may be purely a bleach solution; or may to a greater or lesser extent contain other detergent or cleaning ingredients.
  • the second aqueous liquor may be generated purely by dissolving bleach in water; at the other extreme, the seocnd aqueous liquor may be generated by dissolving or dispersing a fully formulated bleaching detergent composition, or a fully formulated non-bleaching detergent composition plus separate bleach, in water.
  • the fabrics are allowed to soak in the second aqueous liquor for a period of at least 1 minute, preferably from 1 to 60 minutes, more preferably from 10 to 30 minutes.
  • the fabrics are rinsed in water.
  • a first particulate composition is used to prepare the first aqueous liquor.
  • the material (s) capable of converting blueing agent to a colourless form and/or binding Fe ions optionally from 0 to 30 wt% (eg 1 to 30 wt%) of one or more surfactants;
  • an oxidising agent capable of masking and/or neutralising sulphurous odours ,
  • the balance if any may be constituted by an inert filler such as sodium sulphate .
  • the first particulate composition preferably contains from 0.5 to 10 wt% of potassium iodate, magnesium monoperoxyphthalate or potassium benzenecarboperoxoate.
  • Potassium iodate is especially preferred and is effective in an amounts of from 0.5 wt%, preferably from 0.5 to 2 wt%.
  • the first particulate composition preferably contains from 0.5 to 10 wt%, preferably from 0.5 to 6 wt% and more preferably from 0.5 to 4 wt%, of alkali metal dichlorocyanurate.
  • the first particulate composition has a pH (of a 1% solution in demineralised water at 20°C) not greater than 5, preferably within the range of from 2.0 to 5.0, more preferably within the range of from 3.5 to 4.5, and desirably about 4.0.
  • a surfactant system is preferably present .
  • compositions may, for example, contain the following ingredients in the following concentration ranges (suitable and preferred, wt%) :
  • Sodium citrate 0-50 30-45 Anionic surfactant (LAS or AOS) 0-25 3-25
  • Nonionic surfactant eg C i2 7EO 0-5 0-5
  • the first particulate composition may suitably be used at a dosage of from 2 to 20 g, preferably from 5 to 10 g, per 250 g fabrics to prepare the first aqueous liquor.
  • a second particulate composition is used to prepare the second aqueous liquor.
  • This product comprises:
  • surfactant preferably anionic and/or nonionic surfactant
  • an alkaline buffering agent optionally from 0 to 99 wt% (preferably from 1 to 99 wt%) of an alkaline buffering agent
  • the second particulate composition may suitably be used at a dosage of from 2 to 20 g, preferably from 5 to 10 g, per 250 g of fabrics.
  • compositions may, for example, contain the following ingredients in the following concentration ranges (suitable and preferred, weight %) :
  • NaDCCA or PAP 1-10 2-6 Sodium carbonate (soda ash) 5-90 5-10 Sodium bicarbonate 0-60 5-10 Sodium tripolyphosphate 5-30 10-20 Sodium sulphate 0-30 10-25 Anionic surfactant (LAS or AOS) 10-30 20-25 Nonionic surfactant (eg C 12 7EO) 0-5 0
  • Sequestrant eg Dequest 2047
  • Fluorescer eg Tinopal CBS-X 0.1-1 0.2-0.5 Protease granules 0-5 1-3 Cellulase granules 0.5 1.3 Perfume 0.05-1.0 0.1-0.5 Packaging and presentation
  • the two particulate compositions are separately packaged. According to a preferred embodiment of the invention, they are packaged in unit dose form so that a single dose of each composition may be used per treatment. Especially preferred are sachets. Opening sachets of paper or nonwoven fabric are preferred. Sachets suitable for containing detergent powders and similar materials are widely disclosed in the prior art.
  • the sachets containing the two particulate compositions are visually distinct, for example, colour coded.
  • the sachets may then be packed together in outer packaging, for example, a bag or carton, possibly grouped in pairs, while remaining readily distinguishable.
  • a first particulate composition l(i) had the following formulation:
  • composition l(i) 7.5 g doses of Composition l(i) were packaged in sachets of nonwoven fabric.
  • the 1% solution pH of Composition l(i) was 2.4-2.5.
  • a second particulate composition l(ii) had the following formulation:
  • a first particulate composition 2 (i) having a 1 wt% solution pH of 4.0 had the following formulation:
  • a second particulate composition 2 (ii) had the following formulation:
  • a first particulate composition 3 (i) having a 1 wt% solution pH of 4.0 had the following formulation:
  • a second particulate composition 3 (ii) had the following formulation:
  • the fabrics to be treated were cotton vests and polyester/cotton shirts which had been subjected to 10 wash/wear cycles, the wash being by hand using a laundry detergent powder commercially available in India.
  • a sachet of particulate composition l(i) of Example 1 (7.5 g) were dissolved in 1.5 litres of water in a bucket to prepare a first aqueous liquor.
  • the pH of the liquor was 2.6-2.7 and the concentration of the active ingredient, citric acid, was 4.725 g/litre.
  • the greyed garments (total weight of load 250 g) were placed in the aqueous liquor and allowed to soak for 15-30 minutes.
  • the garments were removed from the first bucket, wrung out by hand to remove excess liquid, placed in the second bucket, and allowed to soak for 15 minutes.
  • Example 5 rejuvenation of greyed fabrics (multiple treatment)
  • the load was of cotton vests (250 g)
  • the average initial reflectances were 58.4 at 460 nm and 52.8 at 600 nm.
  • the vests were subjected to the treatment described in Example 3, allowed to dry, then subjected again to the treatment. This process was repeated to give a total of five treatments. The reflectance was measured at each stage, and the increases are given below.
  • Example 4 The procedure of Example 4 was repeated using the formulation of Example 2.
  • the reflectance results were as follows :
  • Example 4 The procedure of Example 4 was repeated using the formulation of Example 3.
  • the reflectance results were as follows :
  • Example 3 (ii) The performance of the composition of Example 3 was compared to the performances of corresponding compositions containing lower levels of enzymes, and a control product without either enzyme (the balance being made up with sodium sulphate) .
  • the results ( ⁇ R 460* differences on Indian consumer vests) were as follows:
  • the vest was soaked in a solution of 0.5 g blueing agent (Reckitt ' s Blue*) in 3 litres of water (24° French hard) for 3 minutes, rinsed and dried, this procedure being repeated five times.
  • 0.5 g blueing agent (Reckitt ' s Blue*) in 3 litres of water (24° French hard) for 3 minutes, rinsed and dried, this procedure being repeated five times.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Textile Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Detergent Compositions (AREA)

Abstract

L'invention porte sur un procédé et un produit destinés à traiter des tissés pour réduire ou empêcher leur grisage et/ou restaurer leur blancheur. Pour réaliser le procédé, les tissés sont d'abord trempés dans une liqueur aqueuse à faible pH contenant une matière (de préférence un acide citrique ou un citrate de sodium) capable de transformer un agent d'azurage déposé en un produit incolore et de se lier à des ions ferreux. Les tissés sont ensuite rinsés et séchés après avoir été trempés dans une liqueur blanchissante contenant, par exemple, un agent de blanchiment dichlorocyanurate. Le procédé peut être réalisé de manière appropriée à la main. Le produit comprend deux compositions particulaires emballées séparément, de préférence dans des sachets, pour produire les deux liqueurs.
PCT/EP1999/003587 1998-05-29 1999-05-21 Procede et produit de traitement pour tisses WO1999061572A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
BR9910766-0A BR9910766A (pt) 1998-05-29 1999-05-21 Processo e produto para o tratamento de tecidos têxteis para melhorar, restaurar ou manter a brancura
AU41461/99A AU4146199A (en) 1998-05-29 1999-05-21 Process and product for the treatment of textile fabrics

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GBGB9811633.8A GB9811633D0 (en) 1998-05-29 1998-05-29 Process and product for the treatment of textile fabrics
GB9811633.8 1998-05-29
GBGB9909439.3A GB9909439D0 (en) 1998-05-29 1999-04-23 Process and product for the treatment of textile fabrics
GB9909439.3 1999-04-23

Publications (1)

Publication Number Publication Date
WO1999061572A1 true WO1999061572A1 (fr) 1999-12-02

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PCT/EP1999/003587 WO1999061572A1 (fr) 1998-05-29 1999-05-21 Procede et produit de traitement pour tisses

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AU (1) AU4146199A (fr)
BR (1) BR9910766A (fr)
ID (1) ID26988A (fr)
WO (1) WO1999061572A1 (fr)

Cited By (2)

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Publication number Priority date Publication date Assignee Title
WO2001038626A1 (fr) * 1999-11-26 2001-05-31 Unilever Plc Procede et produit pour le traitement de tissus textiles
EP4174159A1 (fr) * 2021-11-02 2023-05-03 The Procter & Gamble Company Compositions d'entretien de tissus d'acide liquide

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Publication number Priority date Publication date Assignee Title
US3650667A (en) * 1969-02-26 1972-03-21 Steiner American Corp Laundry process for producing fabrics that are substantially free from bacteria and bacterial spores
JPS588180A (ja) * 1981-07-09 1983-01-18 花王株式会社 病院衣料の洗浄方法
EP0488750A2 (fr) * 1990-11-30 1992-06-03 Unilever Plc Procédé et composition pour le traitement de textiles
WO1996021714A1 (fr) * 1995-01-12 1996-07-18 The Procter & Gamble Company Agents de chelation pour une meilleure fidelite des couleurs
DE19521140A1 (de) * 1995-06-09 1996-12-12 Weber Rudolf Dipl Ing Wasserlösliche Beutel mit Wandmittelbestandteilen (Baukastenprinzip)
WO1997039097A1 (fr) * 1996-04-12 1997-10-23 Unilever N.V. Granules de blanchiment a base d'acide amido- et imidoperoxycarboxylique

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3650667A (en) * 1969-02-26 1972-03-21 Steiner American Corp Laundry process for producing fabrics that are substantially free from bacteria and bacterial spores
JPS588180A (ja) * 1981-07-09 1983-01-18 花王株式会社 病院衣料の洗浄方法
EP0488750A2 (fr) * 1990-11-30 1992-06-03 Unilever Plc Procédé et composition pour le traitement de textiles
WO1996021714A1 (fr) * 1995-01-12 1996-07-18 The Procter & Gamble Company Agents de chelation pour une meilleure fidelite des couleurs
DE19521140A1 (de) * 1995-06-09 1996-12-12 Weber Rudolf Dipl Ing Wasserlösliche Beutel mit Wandmittelbestandteilen (Baukastenprinzip)
WO1997039097A1 (fr) * 1996-04-12 1997-10-23 Unilever N.V. Granules de blanchiment a base d'acide amido- et imidoperoxycarboxylique

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Title
DATABASE WPI Section Ch Week 8308, Derwent World Patents Index; Class E34, AN 83-18991K, XP002113902 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001038626A1 (fr) * 1999-11-26 2001-05-31 Unilever Plc Procede et produit pour le traitement de tissus textiles
EP4174159A1 (fr) * 2021-11-02 2023-05-03 The Procter & Gamble Company Compositions d'entretien de tissus d'acide liquide

Also Published As

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ID26988A (id) 2001-02-22
BR9910766A (pt) 2001-10-02
AU4146199A (en) 1999-12-13

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