ES2201262T3 - WHITENING COMPOSITIONS. - Google Patents

Abstract

The present invention relates to hypochlorite bleaching compositions which comprise a polymer, for improved fabric whiteness, and improved fabric safety. Preferred compositions are buffered.

Description

Bleaching compositions.

Field of the Invention

The present invention relates to compositions bleaching, in particular bleaching compositions of hypochlorite, suitable for use in laundry applications such as hand and machine wash methods.

Background of the invention

Bleaching compositions are well known. in the technique Between the different bleaching compositions available, those that are based on bleach by bleach hypohalite, such as hypochlorite, are often preferred, mainly for reasons of result, especially at temperature low.

However, a problem encountered with the use of compositions based on hypochlorite, is the resulting damage and / or yellowing of the tissues that are bleached.

It is, therefore, an object of the invention provide a composition containing hypohalite, suitable for use in laundry applications, which provides whiteness Enhanced tissue for tissues treated with it.

Another object of the invention is to provide a composition containing hypohalite, suitable for use in laundry applications, which provide enhanced security of tissue for tissues treated with it.

To meet such needs, they have Built-in pH buffer components, such as silicates, in hypochlorite compositions. You can find one typical disclosure in the document EP-A-0.653.483.

Thus, the applicant has now found surprisingly that this problem is solved by use, in a hypohalite bleaching composition containing a component pH buffer, of an ingredient that has the ability to prevent the precipitation of the salts of said component buffer after dilution of the composition in water. Indeed, it has been found that improved whiteness and / or safety were obtained of the fabric with the composition of the invention, compared to hypohalite compositions containing a buffer component of pH but not an ingredient that had the ability to prevent the precipitation of the salts of said buffer component after the dilution of the composition in water.

Another advantage of the compositions of the invention is that they are chemically stable. By "chemically stable", it is meant that the hypohalite bleaching compositions of the present invention should not experience more than 15% of loss of available chlorine after 5 days of storage at 50 ° C ± 0.5 ° C. The% loss of available chlorine can be measured using the method described, for example, in "Analyses des Eaux et Javel Extraits "by" La chambre syndicale nationale de L'eau de Javel et des produits connexes ", pages 9-10 (1984). Said method consists in measuring the chlorine available in new compositions, that is, just after being prepared, and in the same compositions after 5 days at 50 ° C.

An additional advantage of the compositions of the invention is that they are suitable for bleaching of different types of tissues, including natural tissues (e.g. tissues made of cotton, viscose, linen, silk and wool), synthetic fabrics, such as those made of polymeric fibers of origin synthetic, as well as those made of both fibers, natural and synthetic Indeed, the compositions of the present invention are they can use on synthetic fibers despite deep-rooted prejudice against the use of hypohalite bleach, especially bleach hypochlorite, in synthetic fibers, as evidenced by warnings on commercially available bleach labels from hypochlorite and clothes.

Compendium of the invention

The present invention is a liquid composition. bleaching comprising

to)

a bleach of hypohalite,

b)

a component pH buffer in an amount of 0.5% to 9% by weight, Y

c)

an ingredient that It has the ability to prevent precipitation of salts from said buffer component after dilution of the composition in Water; with the proviso that said ingredient is a polymer of polyacrylate, the polymer being present in an amount less than 0.5% by weight; wherein said ingredient that has the ability to prevent precipitation of the salts of said compound buffer after dilution of the composition in water, is a polymer selected from the group consisting of: polymers of polyacrylate, acrylic acid and acid co-polymers maleic, co-polymers of styrene sulfonic acid and maleic acid, and mixtures thereof; and wherein said polymer It is modified with aminophosphonic and / or phosphonic groups.

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In another aspect of the invention, it is provided a solid bleaching composition comprising:

to)

a bleach of hypohalite,

b)

a component pH buffer, and

c)

an ingredient that It has the ability to prevent precipitation of salts from said buffer component after dilution of the composition in Water; wherein said ingredient that has the ability to prevent precipitation of the salts of said buffer compound after dilution of the composition in water, is a polymer selected from the group consisting of: polyacrylate polymers, co-polymers of acrylic acid and maleic acid, co- polymers of styrene sulfonic acid and maleic acid, and mixtures of the same; and wherein said polymer is modified with groups aminophosphonic and / or phosphonic.

The present invention also encompasses a process of bleaching tissues with a composition comprising:

to)

a bleach of hypohalite,

b)

a component pH buffer in an amount of 0.5% to 9% by weight, Y

c)

an ingredient that It has the ability to prevent precipitation of salts from said buffer component after dilution of the composition in Water;

in which said tissues are submerged in a bleaching solution formed by diluting said composition in water; and wherein said ingredient that has the ability to prevent precipitation of the salts of said buffer compound after the dilution of the composition in water, is a polymer selected from the group consisting of: polyacrylate polymers, co-polymers of acrylic acid and maleic acid, co-polymers of styrene sulfonic acid and acid maleic, and mixtures thereof; and in which said polymer is modified with aminophosphonic and / or phosphonic groups.

The present invention also encompasses the use, in a hypohalite bleaching composition comprising a pH buffer component of an ingredient that has the ability to prevent the precipitation of said salts buffer component after dilution of the composition in water, as described herein, to provide the improved whiteness and / or safety of the tissue to the treated tissues with the same.

Detailed description of the invention Hypohalite bleach

An essential component of the invention is a hypohalite bleach. The hypohalite bleach can be provided by a variety of sources, including bleach that they are oxidizing lyes and that subsequently lead to formation of positive halide ions, as well as lyes that are based on sources of organic halides such as chloroisocyanurates

Hypohalite bleach suitable for use in This report includes alkali metal and metal hypochlorites alkaline earth, hypobromites, hypoiodites, chlorinated trisodium phosphate dodecahydrates, dichloroisocyanurates potassium and sodium, potassium and sodium trichlorocyanurates, N-chloroimides, N-chloroamides, N-chloroamines and chlorohydantoins.

For liquid compositions, the bleach of Preferred hypohalite among those described above, are the alkali metal and / or metal hypochlorites alkaline earthly selected from the group consisting in sodium, potassium, magnesium, lithium and calcium hypochlorites, and mixtures thereof, more preferably sodium hypochlorite alkali metal

For solid compositions, the bleach of Preferred hypohalite among those described above, are the alkali metal and / or metal hypochlorites alkaline earthly selected from the group consisting in lithium hypochlorites, calcium hypochlorites, dodecahydrates chlorinated trisodium phosphate, potassium dichloroisocyanurates, sodium dichloroisocyanurates, potassium trichlorocyanurates, sodium trichlorocyanurates, and mixtures thereof, more preferably sodium dichloroisocyanurates and / or hypochlorite of calcium.

Preferably, the liquid compositions according to The present invention comprises said hypohalite bleach such that the content of the active halide in the composition is from 0.1% to 20% by weight, more preferably from 2% to 8% by weight, most preferably from 3% to 6% by weight of the composition.

Preferably, the solid compositions according to The present invention comprises said hypohalite bleach such that the content of the active halide in the composition is from 20% to 95% by weight, more preferably from 25% to 60% by weight of the composition.

PH buffer component

A pH buffer component is another Essential component for the compositions of the invention. The pH buffer component ensures that the pH of the composition it is buffered to a pH value that varies from 7.5 to 13, preferably from 8 to 12, more preferably from 8.5 to 11.5 after the composition has been diluted 1 to 500 times its water weight

The appropriate pH buffer components for use herein are selected from the group that It consists of alkali metal salts of carbonates, polycarbonates, sesquicarbonates, silicates, polysilicates, borates, metaborates, phosphates, stannates, aluminates and mixtures thereof, and preferably they are selected from the group consisting of sodium carbonate, sodium silicate, sodium borate, and mixtures of the same.

The raw materials involved in the preparation of hypohalite bleach normally contain by-products, for example, calcium carbonate resulting in an amount of up to 0.4% by weight of by-product within the hypohalite composition. However, in such quantity, the by-product will not have the action buffer defined above.

The liquid bleaching compositions in the present memory, will contain a quantity of buffer component pH from 0.5% to 9% by weight, preferably from 0.5% to 5% by weight weight, and more preferably in an amount of from 0.6% to 3% per composition weight.

Solid bleaching compositions in the present memory will preferably contain an amount of pH buffer component from 3% to 30% by weight, plus preferably from 5% to 25% by weight, and most preferably in an amount of from 10% to 20% by weight of the composition.

Ingredient that has the ability to prevent precipitation of the salts of said buffer component after dilution of water composition

The other essential component of the invention is a ingredient that has the ability to prevent precipitation of the salts of said buffer component after dilution of the water composition That ingredient, preventing the precipitation of the salts of said buffer component after dilution of the composition in water, it has been surprisingly found that provides a reduction in yellowing of tissues treated with he, that is, an improved whiteness, as well as providing a improved tissue security. Naturally, for the purpose of the invention, the ingredient that has the ability to prevent precipitation of the salts of said buffer component after dilution of the composition in water has to be stable in the bleach of hypohalite.

The ability of an ingredient to prevent precipitation of the salts of the buffer component after dilution of the composition in water can be measured by the following comparative test:

A composition containing 5% in weight of sodium hypochlorite, 1.4% by weight of sodium hydroxide, 1.5% by weight of calcium carbonate and water (between 10ºF (French degrees) at 40ºF) to complete up to 100% by weight. 10 ml of this composition to 1 liter of tap water (-1,1ºC). Dissolution it is maintained at 40 ° C for 30 minutes. The precipitates formed are separated from said solution and then dried and weighed. By "separate the precipitates formed" means that filter said solution with an apparatus comprising a pump peristaltic, a vacuum flask and a filter with porosity of 0.45 micrometers

The previous test is repeated with it formulation of the composition but with the exception that, it is added 0.05% by weight of the ingredient to be analyzed at composition. Ingredients that have the ability to prevent precipitation of the salts of the buffer component after dilution of the composition in water will reduce the amount of formed precipitates, as measured according to this method, in more than 50% compared to the same compositions that did not contain the ingredient that has the ability to prevent precipitation of the salts of the buffer component after dilution of the water composition

Preferred ingredients for the purpose of the invention are those that substantially maintain their ability to prevent the precipitation of said salts shock absorber component, as defined above, after dilution of the composition in water after storage in a oven, as defined by the oven test method that follow:

The two compositions defined in the method of Previous test, stored in an oven (Memmert®) at 50 ° C for 7 days After storage, the previous test method it was repeated, that is, for each composition 10 ml of the composition and were added to 1 liter of tap water (30ºF (degrees French)). The solution was maintained at 40 ° C for 30 minutes. The formed precipitates were separated from said solution and then, They dried and weighed.

The compositions can also be valued by its bleaching and / or safety effect on treated tissues.

The bleaching effect, that is, the effect of yellowing prevention, and / or the safety effect of this invention, can be evaluated by comparing the composition according to the present invention with the same composition without the ingredient that has the ability to prevent the precipitation of the salts of said buffer component after dilution of the composition in Water.

The degree of yellowing can be determined both by visual graduation as instrumental. Visually, the difference of yellowing between articles treated with different compositions It can be determined by a team of expert jurors. Instrumentally, the assessment can be determined with the help of colorimeters such as Ganz Griesser® instruments (for example, Datacolor® Spectraflash® SF 500, Machbet White-eye® 500) or a ZEISS ELREPHO® or others, which are available by example, from Hunterlab® or Gardner®.

Tissue safety can be assessed by different test methods, including the test method of degree of polymerization according to UNI (Ente Nazionale Italiano di Unificazione) official method UNI 8282- Determinazione della viscosità; intrinsic in solution of cupriethylene diamine (CED).

Preferred ingredients, which prevent precipitation of the salts of the buffer component after dilution of the composition in water, are polymeric type.

Polymers that prevent precipitation of salts of the buffer component after dilution of the composition in water, they are selected from the group consisting of polymers of polyacrylate, acrylic acid co-polymers and maleic, co-polymers of styrene sulfonic acid and maleic acid, and mixtures thereof, modified with groups aminophosphonic and / or phosphonic.

The molecular weight of these polymers and co-polymers is preferably below 100,000, most preferably between 500 and 50,000. Polymers and co-polymers more suitable for use herein memory, will be soluble in an amount up to 0.1% by weight, in a aqueous composition comprising 5% by weight of sodium hypochlorite with its pH adjusted to 13 with sodium hydroxide.

Commercially available polymers, suitable for use herein, which prevent the precipitation of the salts of the buffer component after dilution of the composition in water, are polyacrylate polymers sold under the trade name Norasol® of Norso Haas. The Commercially available preferred polymers are the polymer of modified polyacrylate with phosphonic groups Norasol® 440N (PM 4,000) and its corresponding acidic form Norasol® QR 784 (PM 4,000).

A preferred polymer for use herein memory that still maintains its ability to prevent the precipitation of the salts of said buffer component after dilution of the composition in water, after storage in an oven as defined in the previous oven test method, they are the polymer of commercially modified polyacrylate with phosphonic groups available under the trade name Norasol® 440N (PM 4,000) and its corresponding acidic form Norasol® QR 784 (PM 4,000) of Norso-Haas.

Polymer mixtures as described in the This report can also be used here. invention.

The ingredient that has the ability to prevent precipitation of the salts of the buffer component after dilution of the composition in water is preferably present in a low amount, that is, in an amount of up to 0.5% by weight, more preferably from 0.001% to 0.3% by weight, most preferably from 0.005% to 0.2% by weight of the composition liquid

The solid compositions of the invention preferably comprise an amount of said ingredient from 0.01% to 3% by weight, preferably from 0.05% to 2% by weight of the composition.

The compositions according to the present invention they are either in liquid or solid form. Solid forms include forms such as powders, tablets and granules. Preferably The compositions of the invention are in aqueous liquid form. Plus preferably, they comprise water in an amount of from 60% to 98% by weight, more preferably from 80% to 97%, and most preferably from 85% to 97% by weight of the composition of total aqueous liquid bleaching.

pH

The pH of the liquid compositions according to the The present invention, as such, is typically from 12 to 14 measured at 25 ° C The solid compositions or the liquid compositions of the invention have a pH of from 7.5 to 13, preferably from 8 to 12, more preferably from 8.5 to 11.5, when diluted from 1 to 500 times its water weight. It is in this alkaline interval that you get the optimal stability and performance of the hypohalite, as well such as whiteness and / or tissue safety. The pH range is adequately provided by the pH buffer component and the hypohalite bleach mentioned hereinbefore, the which are alkalis However, in addition to these components, an alkalinity source can also be optionally used strong.

Suitable sources of alkalinity are the Caustic alkalis such as sodium hydroxide, potassium hydroxide and / or lithium hydroxide, and / or alkali metal oxides such as sodium oxide and / or potassium. A source of strong alkalinity preferred is a caustic alkali, more preferably hydroxide sodium and / or potassium hydroxide. The typical levels of such Caustic alkalis, when present, are from 0.1% to 1.5% in weight, preferably from 0.5% to 1.5% by weight of the composition.

The composition according to the invention can also comprise additional optional components such as perfumes, stable bleach surfactants, organic or inorganic alkalis, pigments, dyes, optical brighteners, solvents, agents chelators, radical scavengers and mixtures thereof.

Preferably, the compositions of the The invention is used in diluted form in washing applications. The expression "used in diluted form" herein, includes dilution by the user, which happens for example in hand wash applications, as well as dilution by other means, such as in a washing machine. Preferably, the composition it is diluted 5 to 500 times its water weight for the application of hand wash and 10 to 500 times its water weight in a machine washing machine. Thus, in another aspect of the invention, provides a process for washing fabrics with a composition as disclosed herein, where said tissues are submerged in a bleaching solution, formed by diluting said water composition

In another aspect of the invention, it is provided the use, in a hypohalite bleaching composition comprising a pH buffer component of an ingredient that has the ability to prevent the precipitation of said salts buffer component after dilution of the composition in water to provide improved whiteness and / or safety to the tissues treated with him. Accordingly, the present invention also covers the use, in a hypohalite bleaching composition that it comprises a pH buffer component, of an ingredient that has the ability to prevent the precipitation of the salts of said buffer component after dilution of the composition in water, to provide whiteness and / or improved safety to the tissues treated with him. For "whiteness and / or improved safety" is it means that hypohalite bleaching compositions, which they comprise a pH buffer component and an ingredient that has the ability to prevent the precipitation of the salts of said buffer component after dilution of the composition in water, provides better whiteness, i.e. less yellowing, and / or safety of tissue compared to hypohalite bleaching compositions that They don't understand that ingredient.

The invention is illustrated in the following non-limiting example, in which all percentages are based by weight, unless otherwise indicated.

Example 1

The following compositions, according to the invention, They were prepared:

Composition (weight in %) one two 3 4 5 6 7 8 Hypochlorite sodium 5.0 5.0 5.0 2.5 2.5 2.5 5.0 5.0 Hydroxide sodium 0.9 0.7 0.7 0.9 0.7 0.7 0.5 - Carbonate sodium 1.2 1.2 1.2 1.2 1.2 1.2 - 1.5 Silicate sodium - 0.5 - - 0.5 - - - Metaborate of sodium - - 1.0 - - 1.0 1.0 - QR norasol 784 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 Water and minority components to balance to 100

Claims (12)

1. A bleaching liquid composition that understands:

to)

a bleach of hypohalite

b)

a component pH buffer in an amount of 0.5% to 9% by weight, Y

c)

an ingredient that has the ability to prevent the precipitation of the salts of said buffer component after dilution of the composition in water; with the proviso that said ingredient is a polymer of polyacrylate, the polymer being present in an amount less than 0.5% by weight; wherein said ingredient that has the ability to prevent the precipitation of the salts of said component buffer after dilution of the composition in water, is a polymer selected from the group consisting of: polymers of polyacrylate, acrylic acid and acid co-polymers maleic, co-polymers of styrene sulfonic acid and maleic acid, and mixtures thereof, and wherein said polymer It is modified with aminophosphonic and / or phosphonic groups.

2. A solid bleaching composition that understands:

to)

a bleach of hypohalite,

b)

a component pH buffer, and

c)

an ingredient that has the ability to prevent the precipitation of the salts of said buffer component after dilution of the composition in water; wherein said ingredient that has the ability to prevent precipitation of the salts of said buffer compound after the dilution of the composition in water, is a polymer selected from the group consisting of: polyacrylate polymers, co-polymers of acrylic acid and maleic acid, co-polymers of styrene sulfonic acid and acid maleic, and mixtures thereof, and wherein said polymer is modified with aminophosphonic and / or phosphonic groups.

3. The use, in a bleaching composition of hypohalite comprising a pH buffer component of a ingredient that has the ability to prevent precipitation of the salts of said buffer component after dilution of the water composition, wherein said ingredient having the ability to prevent the precipitation of said salts buffer compound after dilution of the composition in water, is a polymer selected from the group consisting of: polymers of polyacrylate, acrylic acid and acid co-polymers maleic, co-polymers of styrene sulfonic acid and maleic acid, and mixtures thereof, and wherein said polymer it is modified with aminophosphonic and / or phosphonic groups, to provide whiteness and / or improved safety to treated tissues with the. 4. A process of bleaching tissues with a composition comprising:

to)

a bleach of hypohalite,

b)

a component pH buffer in an amount of 0.5% to 9% by weight, Y

c)

an ingredient that has the ability to prevent the precipitation of the salts of said buffer component after dilution of the composition in Water;

in which said tissues are submerged in a bleaching solution formed by diluting said composition in water; and wherein said ingredient that has the ability to prevent precipitation of the salts of said buffer compound after the dilution of the composition in water, is a polymer selected from the group consisting of: polyacrylate polymers, co-polymers of acrylic acid and maleic acid, co-polymers of styrene sulfonic acid and acid maleic, and mixtures thereof, and wherein said polymer is modified with aminophosphonic groups and / or phosphonic 5. A bleaching composition according to claims 1 or 2, the use according to claim 3, or the process according to claim 4, wherein said ingredient is present in an amount from 0.001% to 0.5% by weight, preferably from 0.001% to 0.3%. 6. A bleaching composition, use or process according to any one of claims 1 to 5, in the that said polymer has a molecular weight below 100,000. 7. A bleaching composition, use or process according to any one of the claims 1-6, wherein said pH buffer component is selected from the group consisting of alkali metal salts of carbonates, polycarbonates, sesquicarbonates, silicates, polysilicates, borates, metaborates, phosphates, stannates, aluminates, and mixtures thereof.

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8. A bleaching composition, use or process according to claim 7, wherein said component pH buffer is selected from the group consisting of sodium carbonate, sodium silicates, sodium borate, and mixtures thereof. 9. A bleaching composition, use or process according to any one of the claims 1-8, wherein said pH buffer component is in an amount from 0.5% to 9% by weight, preferably 0.5% to 5% by weight of the liquid composition or in an amount from 3% to 30% by weight, preferably from 5% to 25% by weight, of the solid composition 10. A bleaching composition, use or process according to any one of the claims 1-9, in which said hypohalite bleach is, for liquid bleaching compositions, a sodium metal hypochlorite alkali or, for solid compositions, sodium dichloroisocyanurate and / or calcium hypochlorite. 11. A bleaching composition, use or process according to any one of the claims 1-10, in which said hypohalite, based on halide active, it is present in an amount from 0.1% to 20% by weight, preferably from 2% to 8% by weight of the liquid composition or in an amount from 20% to 95% by weight, preferably from 25% to 60% by weight of the solid composition. 12. A bleaching composition, use or process according to any one of the claims 1-11, wherein said composition further comprises A source of strong alkalinity.