FR2773168A1 - LIQUID BLEACHING COMPOSITION - Google Patents

Abstract

The invention relates to a liquid bleaching composition which comprises: (i) a halogenated bleaching component such as sodium hypochlorite; (ii) a surfactant thickening system which comprises: (a) a surfactant of the tertiary amine oxide type; (b) a surfactant component comprising an anionic surfactant of the secondary alkane sulfonate type; and (c) a solubilizing anionic surfactant, such as an alkanoylsarcosinate, a soap, an alkylcarboxylate or a xylene sulfonate; (iii) an electrolyte; and (iv) water. This composition retains a satisfactory viscosity during storage and after dilution. Application area: Bleaching products.

Description

The present invention relates to a liquid bleaching composition

  aqueous hypochlorite-based, which contains one or more surfactants and one or more electrolytes to thicken it. In particular, the invention relates to compositions which retain a substantial viscosity upon storage and when they are subsequently diluted. Numerous thickened aqueous liquid bleaches have been proposed, the viscosity of which is maintained, increases or does not greatly decrease by dilution with water. For example, the document WO 95/02664 proposes compositions (among which appear bleaching products) whose viscosity increases with dilution. The thickening system comprises a surfactant of the ether sulfate type alone15 or in combination with one or more anionic, nonionic, amphoteric or cationic surfactants and a

electrolyte and / or a hydrotrope.

  A similar approach has been followed in the proposal of document WO 96/21721 where the thickening system comprises up to 15% by weight of a surfactant system comprising one or more anionic surfactants alone or in combination with one or more nonionic or amphoteric surfactants. The composition also preferably contains a viscosity modifier

  polymer, soluble or dispersible in water.

  WO 95/02664 and WO 96/21721 give examples of whitening products thickened with a surfactant system consisting of alkyl ether sulfate and amine oxide. In the first document (WO 95/02664) there are examples of thickened aqueous compositions (although not containing bleaching agents) in which

  the thickening system comprises an alkyl ether sulfate in the form of sodium lauryl ether sulfate as well as (respectively) a component chosen from lauroyl-

  sodium sarcosinate, an alkyldimethylamine oxide, a sodium alkane sulphonate, an alkyl amido-betaine, sodium lauryl sulphate and coconut diethanolamide, as well as 17% by weight of electrolyte. In practice, all of the above-mentioned known thickening systems are based on an electrolyte to create the structure offering the desired high viscosity. However, concentrated formulations tend to separate into phases and surfactants, especially in the separate phases, tend to activate the breakdown of bleaching components. The decomposition of the bleaching components in turn increases the electrolyte concentration, which further affects the characteristics of

  viscosity. This problem arises in particular with lauryl ether sulfate systems in which the surfactant precipitates at high concentrations of electrolyte, which reduces viscosity and further activates the decomposition of bleaching components.

  Document EP-A-137 551 describes examples of soap / amine oxide / alkyl-ether-sulfate mixtures; soap / amine oxide / alkyl sulfate; sarcosinate / amine oxide / alkyl ether sulfate; soap / amine oxide / (secondary alkyl) sulfate; and soap / amine oxide / alkylbenzenesulfonate in liquid bleaches. Combinations of surfactants of the amine oxide and sarcosinate types in bleaching products are known from GB-A-1 466 560. However, these mixtures do not have optimal viscosity characteristics

dilution.

  The present invention aims to provide a liquid bleaching composition based on hypochlorite which has an appreciable viscosity on storage and dilution and which retains an appreciable viscosity even

  after a strong decomposition of the bleaching component.

  Thus, the present invention provides a liquid bleaching composition comprising: (i) a halogenated bleaching component; (ii) a surfactant thickening system which comprises: (a) a surfactant of the tertiary amine oxide type; (b) an anionic surfactant of the secondary alkane sulfonate type; and (c) a solubilizing anionic surfactant; (iii) an electrolyte; and

(iv) water.

  The solubilizing surfactant serves to maintain the activity of the bleaching components in solution in the bleaching composition, in particular in the concentrated composition. The viscosity of the composition is maintained by keeping the thickening system in solution. In addition, by preventing separation, a composition can be obtained

relatively clear concentrate.

  The solubilizing surfactant is used to maintain

  in solution the other ingredients, for example perfumes.

  The solubilizing surfactant is highly hydrophilic, has good solubilizing properties and good stability in the presence of halogen, and it serves to prevent separation of the bleaching composition into

separate phases.

  Particularly preferred solubilizing surfactants are an anionic surfactant of the alkanoylsarcosinate type; a soap, in particular in C8 to C16 and preferably sodium laurate; an alkylcarboxylate, especially at C8 to C16 and preferably at C12; and a xylene sulfonate. Sarcosinate is particularly preferred. The surfactant of the tertiary amine oxide type of the thickening system is preferably chosen from the class of amine oxides defined by the general formula: R1

R-N-> O

  R in which R is a linear or branched long chain alkyl group, typically containing 8 to 20 carbon atoms, and each of the R groups is a lower alkyl group, typically containing 1 to 4 carbon atoms. Particular examples of this class of nonionic surfactants are alkyldimethylamine oxides such as those sold under the trade names "Empigen OB" and "Empigen OH-25D" by Albright & Wilson or "Pentanox 4X"

  by Pentagon Chemicals. In the present description, the quantity of material used is the quantity calculated as active material in the product supplied commercially. Thus, 2.5% by weight means 2.5 g of active material per 100 g of bleaching composition.

  The total amount of the tertiary amine oxide type surfactant in the composition is preferably

  from 2.5% to 5%, better still from 2.6 to 4.35% and in particular from 3.35% to 3.85% by weight of the total composition.

  The total amount of the anionic surfactant of the secondary alkanesulfonate type is preferably less than 2%, better still less than 1.17%, very preferably less than 0.93% and in particular from 0.57% to

  0.81% by weight of the total composition.

  The total amount of the surfactant solubi-

  reading is preferably less than 2%, better still less than 1.61% and in particular from 0.89% to 1.25% by weight

of the total composition.

  In all cases, the surfactant thickening system preferably represents 1% to 10%, better still

  2.5% to 9% by weight of the total composition.

  In addition to the essential components of the surfactant thickening system, the thickening system can optionally contain one or more other surfactants in a proportion of, for example, 0.1% to 5%, preferably 0.5% to 2 % by weight of the total composition. These other surfactants can be chosen

  among anionic, nonionic, amphoteric and cationic surfactants.

  The bleaching component is preferably a bleaching agent of the alkali metal hypochlorite type, in particular sodium hypochlorite. Thus, the compositions according to the invention can be formulated to give, after dilution (for example with 2 parts of water per 1 part of composition), a bleaching product which contains a sufficient quantity of bleaching agent. that there is 0.1 to 10% by weight of active chlorine in the diluted product. 10 In all cases, the total bleaching component preferably represents 0.1% to 15% by weight of the

total composition.

  The electrolyte content of the composition influences

  on the viscosity of the undiluted product and after dilution.

  This electrolyte can be added to the composition as a separate component or can be added to one of the other components before incorporation into the product. The electrolyte can also be present as a by-product of manufacture in one of the other components, for example in a bleaching hypohalogenite. The mention of an electrolyte here refers to the incorporated electrolyte coming from

  any origin. The term designates any metal salt

  of a mineral acid and which is dissolved in the compound

  sition according to the present invention.

  Suitable electrolytes can be one or more compounds chosen from sodium chloride, sodium hydroxide and sodium carbonate (or other suitable alkali metal salt). Since the bleach degrades during storage, the concentration of some of these electrolytes tends to increase. However, as a general rule, the Applicant prefers that the total amount of electrolyte is from 0.1% to 15% by weight of the total composition, preferably from 5% to 10%, in particular from 6% to 9% of the formulation

initial.

  Preferably, the compositions according to the present invention have a viscosity before dilution of 50 to 50,000

  mPa.s, better still from 100 to 10 000 mPa.s and very prefer-

  from 500 to 1000 mPa.s. By dilution with 2 parts of water for 1 part of the composition, they give a diluted product whose viscosity is preferably from 25 to 000 mPa.s, better still from 50 to 2000 mPa.s and very preferably from 100 to 500 mPa.s. All viscosities

  mentioned here are as measured using a Brookfield LV viscometer with an N 2 spindle at a speed of 6 rpm and a temperature of 20 C.

  The compositions of the present invention may also contain one or more other optional ingredients, for example coloring materials such as dyes, perfumes, sequestrants and viscosity modifiers stable in the presence of agent

  chlorine bleaching. In this regard, it may be noted that the commercially available perfumes can themselves have a viscosity-modifying effect. The present invention will now be explained in more detail by the following nonlimiting examples.

  Example 1 A base composition having the formulation indicated in the following table is prepared.

  Product Diluted undiluted product * 1 Myristyldimethylamine oxide 3.36 1.12 2 Lauroylsarcosinate 1.13 0.38 3 Secondary alkane sulfonate 0.70 0.23 4 Sodium hypochlorite 7.50 2.50 Sodium hydroxide 1, 32 0.44

6 Perfume q.s. q.s.

  7 Stabilizer (sodium periodate) 0.024 0.008 8 Water softened the rest the rest * obtained by diluting 1 part of concentrate with

2 parts of water, by weight.

  As mentioned above, the amount of material is the amount of active material, expressed in% by weight of the overall composition. The undiluted product has a viscosity of approximately 500 mPa.s and the diluted product a viscosity of approximately 220 mPa.s, measured using a Brookfield LV viscometer with an N 2 spindle at a speed of 6 rpm and at a

temperature of 20 C.

  The effect of varying the concentration of surfactant components is then measured by varying the concentration of one component, that of the two

  others being kept constant, which gives the following results.

  Viscosity iodide oxide Viscosity of d15myristyla- of the product diluted undiluted dimethylamine product * (% by weight)

1.25 20 25

2.60 70 200

2.85 180 220

3.10 375 210

3.35 555 240

3.60 645 240

3.85 1,190,255

4.10 2000 255

4.35 2920 235

  Viscosity Viscosity Alcane-sulfonate lcan-uonate of the product of the product (% by weight) undiluted diluted

0.33 2840 55

0.45 2075 85

0.57 1385 135

0.69 755,215

0.81 380 285

0.93 270 395

1.05 40,515

1.17 30 530

  Alcanoyl- Viscosity Viscosity sarcosinate of the product of the product (% by weight) undiluted diluted

0.77 365 280

0.89 400 265

1.01 435 255

1.13 420 215

1.25 520 185

1.37 615 160

1.49 645 125

1.61 685 115

  The surfactant thickening systems remain soluble and therefore only a simple reduction in

  viscosity upon dilution, but to a degree which, within the preferred concentration ranges, gives the diluted product a high acceptable viscosity.

Examples 2 to 5

  We prepare the following formulations and measure

  viscosity before and after dilution.

Example 2

  Product Diluted undiluted product Myristyldimethylamine oxide 3.36 1.12 Lauroylsarcosinate 1.13 0.38 Lauryl ether sulfate (2 moles of EO) 0.38 0.125 Secondary alkane sulfonate 0.7 0.23 Sodium hypochlorite 7 .5 2.5 Sodium hydroxide 1.32 0.44

Perfume q.s. q.s.

  Stabilizer (sodium metaperiodate) 0.024 0.008 Water softened the rest the rest Viscosity 540 mPa.s 230 mPa.s (LV, spindle N 2, speed 6 rpm)

Example 3

  Product Diluted undiluted product Myristyldimethylamine oxide 3.36 1.12 Xylene sulfonate 0.72 0.24 Secondary alkane sulfonate 0.7 0.23 Sodium hypochlorite 7.5 2.5 Sodium hydroxide 1.32 0, 44

Perfume q.s. q.s.

  Stabilizer (metaperiodatedesodium) 0.024 0.008 Water softened the rest the rest Viscosity 1815 mPa.s 140 mPa.s (LV, spindle N 2, speed 6 rpm)

Example 4

  Product Diluted undiluted product Myristyldimethylamine oxide 3.36 1.12 Alkylcarboxylate 0.384 0.128 Secondary alkane sulfonate 0.7 0.23 Sodium hypochlorite 7.5 2.5 Sodium hydroxide 1.32 0.44

Perfume q.s. q.s.

  Stabilizer (sodium metaperiodate) 0.024 0.008 Viscosity 290 mPa.s 400 mPa.s (LV, spindle N 2, speed 6 rpm)

Example 5

  Product Diluted undiluted product Myristyldimethylamine oxide 3.36 1.12 Sodium laurate 0.15 0.05 Secondary alkane sulfonate 0.7 0.23 Sodium hypochlorite 7.5 2.5 Sodium hydroxide 1.32 0, 44

Perfume q.s. q.s.

  Stabilizer (sodium metaperiodate) 0.024 0.008 Softened water the rest the rest Viscosity 352 mPa.s 150 mPa.s (LV, spindle N 2, speed 6 rpm) 1) Laurylamine oxide = Empigen OB 2) Lauryl-ether- sulfate = Manro NES28 3) Alkylcarboxylate = Akypo TFC 4) Xylene-sulfonate = Manro SXS30) Sodium laurate = neutralized form of lauric acid 6) Myristylamine oxide = Empigen OH25D 7) Alkylsarcosinate = Hamposyl L30 8) Secondary alkane-sulfonate = Manro SAS30X

Claims (14)

  1. Liquid bleaching composition, characterized in that it comprises: (i) a halogenated bleaching component; (ii) a surfactant thickening system which comprises: (a) a surfactant of the tertiary amine oxide type; (b) a surfactant component comprising an anionic surfactant of the secondary alkane sulfonate type; and   (c) a soluble anionic surfactant reading; (iii) an electrolyte; and (iv) water.   2. Composition according to claim 1, characterized in that the bleaching component is a component   chlorine-based bleaching. 3. Composition according to claim 2, character-   laughed at in that the bleaching component is sodium hypochlorite.   4. Composition according to claim 1, 2 or 3, characterized in that the solubilizing surfactant   is chosen from an alkanoylsarcosinate, a soap, an alkyl-carboxylate and a xylene sulfonate.   5. Composition according to claim 4, characterized in that the solubilizing surfactant is a   alkanoylsarcosinate. 6. Composition according to any one of the claims.   cations 1 to 5, characterized in that the total amount of surfactant of the tertiary amine oxide type is   2.5% to 5%, preferably 2.6% to 4.35%, more preferably 3.35% to 3.85% by weight of the total composition.   7. Composition according to any one of the claims   above, characterized in that the total amount of anionic surfactant of the secondary alkane sulfonate type is less than 2%, preferably less than   1.17%, better still less than 0.93% and very preferably from 0.57% to 0.81% by weight of the total composition.   8. Composition according to any one of the claims   previous cations, characterized in that the total amount of solubilizing anionic surfactant is   less than 2%, preferably less than 1.61%, better still from 0.89% to 1.25% by weight of the total composition. 9. Composition according to any one of the claims   previous cations, characterized in that it comprises the surfactant thickening system in an amount of 1% to   %, preferably 2.5% to 9% by weight of the total composition.   10. Composition according to any one of the claims.   previous cations, characterized in that it comprises   0.1% to 15% by weight of the bleaching component.   11. Composition according to claim 7, character-   rise in that it comprises a sufficient amount of the halogenated bleach to provide 0.1% to 10% by weight of active halogen after dilution with 2 parts   by weight of water for 1 part by weight of the composition.   12. Composition according to any one of the claims.   previous cations, characterized in that the total amount of electrolyte is from 0.1% to 15%, preferably from   5% to 10% and in particular from 6% to 9% by weight of the compound total sition.   13. Composition according to any one of the claims.   previous cations, characterized in that it has a viscosity of 50 to 50,000 mPa.s, preferably 100 to   10,000 mPa.s and very preferably 500 to 1,000 mPa.s.   14. Composition according to any one of the claims.   previous cations, characterized in that, when diluted with 2 parts by weight of water per 1 part by weight of the composition, it gives a diluted product having a viscosity of 25 mPa.s to 10 000 mPa.s, preferably from 50 to   2000 mPa.s and better still from 100 to 500 mPa.s.