JP2007511648A - Hypochlorite bleaching composition - Google Patents

Abstract

  The present invention comprises at least two electrolytes selected from the group consisting of water, hypochlorite bleach, surfactants and alkali metal hydroxides, chlorides, sulfates, carbonates and mixtures thereof. Concentrated bleaching compositions comprising different alkali metal ions are provided. The composition of the present invention has sufficient viscosity to be applied to a wide variety of surfaces, including vertical or sloped surfaces, and is effectively viscous using materials that are inexpensive and readily available. Has been enhanced.

Description

  The composition of the present invention relates to a concentrated chlorine bleaching composition.

  Cleaning compositions are used in daily life to clean a wide variety of materials such as hard surfaces, fabrics and fabric upholstery. Many cleaning compositions often contain a bleaching agent in combination with a surfactant. Such bleach-containing compositions are particularly contemplated for removing colored soils such as from fabrics or hard surfaces, or especially for sanitary cleaning of hard surfaces. Active chlorine bleaches are very common for this purpose.

  Common materials that make up such hard surfaces include ceramic, metal (eg, stainless steel, chrome plated materials), stone, wood, firewood and polymer surfaces.

  Cleaning compositions containing bleach often need to increase viscosity. A thickened composition is easy to dispense in a controlled manner. Also, when the composition is applied to the surface to be cleaned, it is in contact with the surface for a sufficient amount of time to thoroughly clean. This is particularly important when the composition is applied to the underside of a horizontal surface or to a vertical or inclined surface such as a toilet rim or toilet bowl. Methods to increase the viscosity of these compositions include the use of polymers or the incorporation of high quality surfactants, both of which are expensive methods.

  U.S. Pat. No. 4,839,077 describes (i) a halogenated bleach, (ii) a charged monomer such that the molecular weight is between 1000 and 100,000, and the resulting polymer has an acid number between 80 and 400 mg KOH / g polymer. Described is a thick bleach composition comprising a polymer thickener comprising an uncharged monomer, (iii) a surfactant system comprising a bleach-resistant nonionic surfactant and a bleach-resistant anionic surfactant.

  U.S. Pat. No. 5,821,214 describes (i) soft abrasive particles from 0.5 to 10%, (ii) chlorine bleach from 0.5 to 2.5%, and (iii) cross-linked polyacrylic having a molecular weight range of from 1,000,000 to 10,000,000. Concentrated system containing resin 0.2 to 3%, (iv) Bleaching stable surfactant system containing mainly anionic surfactant 0.25 to 3%, and (v) pH range from 11.5 to 13 A cleaning composition containing a sufficient amount of potassium hydroxide or sodium hydroxide to achieve .5 is described.

  JP-A-10 / 241687 describes (i) alkali metal hypochlorite 0.1 to 8%, (ii) alkali metal hydroxide 0.1 to 9%, and (iii) anionic surfactant 0.1. 1 to 5% and (iv) a hard bleaching liquid bleach composition comprising 0.1 to 5% buffer, preferably phosphoric acid or a salt thereof or a soluble silicate.

  US Pat. No. 6,100,288 includes a hydrotrope comprising (i) an effective amount of a compound that produces hypochlorous acid, (ii) (a) an alkali metal soap, (b) a trialkylamine oxide, betaine, and mixtures thereof. Describes a three-component thickening system, iii) a bleach-stable solvent and (iv) a buffer / electrolyte that stabilizes the composition, a bleaching gel-like detergent comprising the balance water, and a method for its preparation.

  Such prior art compositions are expensive because they require expensive raw materials such as complex multicomponent mixtures and / or polymers. Accordingly, there is a need for hypochlorite bleaching compositions that are less viscous and have increased viscosity using readily available materials.

  The present invention provides a concentrated liquid hypochlorite bleaching composition comprising a surfactant and an alkali metal electrolyte with sufficient viscosity useful for application to a wide range of surfaces, including vertical or sloped surfaces. .

  In this specification, unless otherwise specified, all percentages are by weight based on the total weight of the composition.

  The concentrated liquid bleaching composition comprises water, hypochlorite 0.1 to 10%, surfactant 0.5 to 20%, alkali metal hydroxide, halide, sulfate, carbonate and mixtures thereof. Comprising 0.1 to 8% of an electrolyte selected from the group consisting of: the composition comprising at least two different alkali metal ions.

Bleach The bleach in the concentrated bleach composition of the present invention is hypochlorite. The hypochlorite cation is selected from alkali metals and alkaline earth metals, preferably alkali metals, more preferably sodium and potassium, most preferably sodium.

  Many commercial aqueous solutions of alkali metal hypochlorites also contain the corresponding alkali metal chlorides. This is for a method of producing an alkali metal hypochlorite comprising reacting an alkali metal hydroxide with chlorine gas to form the corresponding alkali metal hypochlorite and alkali metal chloride. . These are often sold as such without further purification and are called “high salt” bleaches. For example, if the alkali metal is sodium, the “high salt” sodium hypochlorite bleach solution will also contain sodium chloride.

  It is also possible to use alkali metal hypochlorites which do not contain the corresponding chloride as a raw material. Such products, often referred to as “low salt” or “high purity” bleaches, are prepared by reacting alkali metal hydroxides with hypochlorous acid.

  The concentrated bleaching compositions of the present invention can be prepared starting from either “high salt” or “low salt” bleaching agents. However, the preferred bleaching agent of the present invention is sodium hypochlorite because of its wide availability and low cost. The “high salt” sodium hypochlorite bleach of the present invention is also preferred because it is more versatile and less expensive than the corresponding “low salt” solution.

  The total amount of alkali metal hypochlorite in the composition of the present invention is in the range of up to 10%, preferably from 0.1 to 8%, more preferably from 1 to 5%.

Surfactants Surfactants that are compatible with hypochlorite are used in the concentrated bleaching compositions of the present invention.

  In the present invention, an anionic surfactant is preferably used, and may be a soap-type or non-soap-type surfactant. It is preferable to use a non-soap surfactant. The anionic surfactant may have an alkali metal or alkaline earth metal or ammonium or alkanolamine counterion, or a mixture thereof.

  In the prior art, organic sulfate monoesters having a branched or straight chain alkyl group containing 8 to 22 C atoms in the molecular structure, or an aryl group or alkylaryl group containing 8 to 22 C atoms and A wide variety of anionic surfactants, including water-soluble salts of sulfonic acids, have been shown to be suitable for use in hypochlorite solutions. Such suitable anionic surfactants include alkali metal salts of alkyl benzene sulfonic acids, alkyl-glyceryl ether sulfates (especially ethers of alcohols obtained from coconut oil and tallow), primary and secondary alkyl sulfones. Acid salts, olefin sulfonates, alkyl sulfates, fatty acid monoglyceride sulfates and mixtures thereof.

  Particularly suitable anionic surfactants for use in the compositions of the present invention are ethoxylated alcohol sulfates, primary and secondary alkyl sulfates such as SLES (sodium lauryl ether sulfate), and mixtures thereof.

  It is also possible to include other surfactants such as nonionic, cationic, amphoteric or zwitterionic surfactants in the compositions of the present invention.

  The total amount of surfactant in the composition of the present invention ranges from 0.5 to 10%, preferably from 0.5 to 10%. Preferably at least 50% by weight of the total surfactant, more preferably at least 70% is an anionic surfactant.

Electrolyte In the present invention, the term “electrolyte” as used herein does not include hypochlorite and ionic surfactants. The electrolyte used in the concentrated bleaching composition of the present invention is selected from the group consisting of alkali metal hydroxides, halides, sulfates, carbonates and mixtures thereof. Preferably they are selected from hydroxides, halides and sulfates, more preferably from hydroxides and halides. Of the halides, chloride is most preferred.

  In combination with hypochlorite, the electrolyte is selected such that the total alkali metal ion component of the composition contains at least two different alkali metals.

  Various alternative ways of meeting this requirement will be apparent to those skilled in the art. One preferred method is to combine at least one alkali metal electrolyte with different cations and an alkali metal hypochlorite. Another method is to combine one or more electrolytes having one or more alkali metal ions with various alkali metal hypochlorites.

  The main alkali metal in the composition is preferably present in a molar amount of at least 10% of the total alkali metal ions.

  In a preferred embodiment of the present invention, all components of the composition are selected such that the cation component of the composition is entirely composed of alkali metal cations. In a more preferred embodiment, the cation comprises only sodium and potassium.

  Given the various preferred embodiments described above, the most preferred embodiment of the present invention is potassium hydroxide in an amount such that hypochlorite and at least 10% of the total molar amount of alkali metal ions are potassium ions. And at least one electrolyte selected from potassium chloride.

  It is also preferred that the electrolyte comprises an agent that ensures that the pH of the concentrated bleaching composition is at least 11, preferably at least 12.5.

  As outlined above, when using a “high salt” alkali metal hypochlorite, avoid that part of the total electrolytic mass in the composition is the alkali metal chloride associated with the hypochlorite. I can't.

  The total amount of electrolyte in the composition of the present invention ranges from 0.1 to 8%, preferably from 0.1 to 5.0%.

  In addition to hypochlorite, surfactant and electrolyte, the composition of the present invention contains water.

Optional Ingredients The ingredients of the present invention may include other optional ingredients to enhance the performance and / or aesthetics of the composition, such as solvents, abrasives, structuring agents, colorants, hydrotropes, whitening agents, fluorescent enhancements. A whitening agent, a soil precipitation inhibitor, and a fragrance | flavor can be contained.

  Compositions according to the present invention generally do not require polymer thickeners to further increase viscosity, and therefore it is preferred that such agents are not included in the composition.

Product Form The composition of the present invention is a liquid with increased viscosity, including liquids that can be easily poured, concentrated liquids, gels, pastes and mousses in the present invention.

  Preferred forms are liquids or gels that can be poured easily or concentrated.

  In a comparative example, the composition contains only one type of alkali metal ion.

Comparative Example A
280 g of SLES (sodium lauryl sulfate (2.5 EO)) was placed in a 3 liter container. To this, a solution of 134 g of sodium hydroxide dissolved in 1580 g of water, 2 g of a sodium silicate solution (solid content 50%), and 10 g of sodium chloride was added with continuous stirring. To prepare the bleaching composition, a “high salt” sodium hypochlorite solution (containing 30 g of sodium hypochlorite and 26 g of sodium chloride and the balance water) was added to the mixture with constant stirring.

Comparative Example B
A composition corresponding to Comparative Example A was prepared except that 16 g of sodium chloride was used instead of 10 g of sodium chloride in the pre-prepared solution.

Comparative Example C
A composition corresponding to Comparative Example A was prepared except that 20 g of sodium chloride was used instead of 10 g of sodium chloride in the pre-prepared solution.

Example 1
A composition corresponding to Comparative Example A was prepared except that 10 g of potassium chloride was added instead of sodium chloride.

(Example 2)
A composition corresponding to Comparative Example B was prepared except that 16 g of potassium chloride was added instead of sodium chloride.

(Example 3)
A composition corresponding to Comparative Example C was prepared except that 20 g of potassium chloride was added instead of sodium chloride.

  Table 1 lists the compositions of Comparative Examples A, B, C and Examples 1, 2, 3 along with the weight percentages of the components. Table 1 also lists the viscosities of the compositions. The data in Table 1 show a synergistic effect on increasing the viscosity of the composition when the total electrolyte concentration is the same when the alkali metal cation associated with the electrolyte is different from the alkali metal cation associated with the alkali metal hypochlorite. It is shown that.

  In Comparative Examples D, E and Examples 4 and 5 according to the invention, a mixture of anionic surfactants was used.

Comparative Example D
A composition corresponding to Comparative Example B was prepared except that 187 g of SLES and 93 g of secondary alkyl sulfate (SAS) were used instead of 280 g of SLES.

Comparative Example E
A composition corresponding to Comparative Example C was prepared except that 187 g SLES and 93 g SAS were used instead of 280 g SLES.

Example 4
A composition corresponding to Example 2 was prepared except that 187 g SLES and 93 g SAS were used instead of 280 g SLES.

(Example 5)
A composition corresponding to Example 3 was prepared except that 187 g SLES and 93 g SAS were used instead of 280 g SLES.

  Table 2 lists the compositions of Comparative Examples D and E and Examples 4 and 5 along with the weight percentages of the components. The data listed in Table 2 show that the composition according to the invention also provides a synergistic effect with respect to the increase in viscosity when using a mixture of surfactants.

(Examples 6 to 11)
These examples show concentrated bleaching compositions according to the present invention having a wide range of concentrations of hypochlorite, surfactant and electrolyte as outlined in Table 3. This table shows that a concentrated bleaching composition according to the present invention (viscosity 90 mPaS or higher) can be obtained with a wide range of concentrations of hypochlorite, surfactant and electrolyte.

Claims (9)

The composition is hypochlorite 0.1 to 10%,
0.5 to 20% surfactant,
Comprising 0.1 to 8% electrolyte selected from the group consisting of alkali metal hydroxides, halides, sulfates, carbonates and mixtures thereof, and comprising at least two different alkali metal ions A concentrated liquid bleaching composition comprising water, a hypochlorite bleach and a surfactant.   The composition of claim 1, wherein the hypochlorite is an alkali metal salt.   The composition of claim 2, wherein the hypochlorite is sodium hypochlorite.   An organic sulfate monoester wherein the surfactant has a branched or straight chain alkyl group containing 8 to 22 C atoms or an aryl or alkylaryl group containing 8 to 22 C atoms in the molecular structure; and 4. A composition according to claims 1 to 3 comprising an anionic surfactant selected from water-soluble salts of sulfonic acids.   The composition according to claims 1 to 4, wherein the main alkali metal in the composition is present in a molar amount of at least 10% of the total alkali metal ions.   The composition according to any one of claims 1 to 5, wherein the electrolyte is selected from alkali metal hydroxides, chlorides, sulfates and mixtures thereof.   7. A composition according to claim 6, wherein the hypochlorite and electrolyte are selected from sodium compounds and potassium compounds.   The composition according to claim 7, wherein the hypochlorite is sodium hypochlorite and the electrolyte is a potassium compound.   The composition according to any one of claims 1 to 8, wherein the total amount of electrolyte in the composition is in the range of 0.1 to 5%.