MXPA99007721A - Toilet cleaning block - Google Patents

Abstract

A composition, which is suitable for use as an ITC block is disclosed, which has advantageous properties related to in-use life span. The composition comprises:(a) 35 to 65%w/w of an anionic detergent (surfactant) selected from alkyl benzene sulphonic acids, alpha olefine sulfonates, long chain fatty acid sulphates, higher fatty acids, as well as the alkali metal and alkaline earth metal salts thereof, and natural detersive agents, and mixtures of any of these;(b) 3 to 15%w/w of a non-ionic detergent (surfactant) selected from alkoxylated alkyl phenols and alkoxylated fatty alcohols;(c) 5 to 10%w/w of a water-swellable cellulose derivative or a salt thereof, wherein the cellulose derivative exhibits a viscosity of at least about 1500 cps, measured in a 1%aqueous solution at 25°C with a Brookfield viscometer (spindle 3, speed 30rpm, factor 40 for viscosities of 2500-3500 cps);(d) 6 to 20%of a solubility regulator selected from alkali metal and alkaline earth metal chlorides, carbonates and sulphates, aluminosilicates and starch;and (e) 0 to 20%of a fragrance (perfume) in solid, liquid or microencapsulated form. The composition may be prepared by mixing and extrusion.

Description

BLOCK FOR CLEANING OF TOILET FIELD OF THE INVENTION The present invention relates to compositions suitable for use as cleansing blocks for toilet, which allow the inclusion of an increased concentration of perfume and which have an extended lifetime in use. In particular, this invention relates to its preparation by extrusion and its use in toilet cisterns.

BACKGROUND OF THE INVENTION Compositions are known, particularly in the form of blocks, for the cleaning of toilet systems by placing the block in the tank (ITC - In-The-Cistern) or toilet bowl (ITB - In-The-Bo l) , so that when the cistern is discharged, the cleaning components are released with the discharged water towards the toilet bowl. Toilet cleaning blocks generally comprise one or more water-soluble detergents which, when released, provide cleaning with the discharged water together with one or more relatively water insoluble agents to retard the dissolution rate of the block. In part, because detergents and other ingredients are not very pleasant to smell and also because it is advantageous to provide a P1478 / 99 pleasant smell, it is normal to add a perfume or fragrance to these blocks. These perfumes or fragrances are often mixtures of various aromatic and non-aromatic compounds and are normally immiscible in water. However, many of these toilet cleaner blocks comprise a relatively low concentration of perfume because, at high concentrations, there is a tendency for the fragrance to begin to ooze out of the block during manufacture, particularly if the amount of other ingredients in the block is not maintain properly. Also, at high concentrations, in use, the perfume (s) can be leached as oily droplets onto the water surface in the cistern in the case of ITC blocks. The blocks have been elaborated, in general, by melting the ingredients and molding the fusion in the desired shape. British Patent Specification No. GB 2 021 143 describes an alternative method comprising: forming a free flowing mixture of certain ingredients and subsequently compressing the mixture in the form of a tablet. However, when manufacturing includes an extrusion step (e.g., forming a roll-shaped block, rather than a tablet), rheological problems arise with the composition, probably due to the relatively low pressure P1478 / 99 (approximately 30 to 50 bar) applied during the extrusion compared to the pressure applied during the manufacture of tablets. Consequently, the extruded blocks tend to have a shorter duration in use than tablets of equivalent weight and composition, which tend to be harder than the corresponding blocks. Therefore, there is a need to improve the life span in use of the extruded block compositions. Obviously, it is a disadvantage to have to replace the blocks for the toilet at frequent short intervals. The longer the period of time or the larger the number of tank discharges over which the compositions can continue to be effective, the better for the consumer.

SUMMARY OF THE INVENTION We have now surprisingly found a composition suitable for use as an ITC extruded block that allows a higher concentration of perfume to be incorporated and which allows the consistent release of perfume and other ingredients during an increased period of life in use of the block. According to the present invention, therefore, there is provided a composition comprising: P1478 / 99 a) from 35 to 65% w / w of an anionic detergent (surfactant) selected from alkyl benzenesulfonic acids, alpha-olefin sulfonates, long-chain fatty acid sulfates, higher fatty acids, as well as metal salts alkaline and alkaline earth metal of the same and of natural detergent agents, and mixtures of any of these; b) from 3 to 15% w / w of a non-ionic detergent (surfactant) selected from alkoxylated alkylphenols and alkoxylated fatty alcohols, particularly those which include an average of 2 to 5 ethoxy and / or propoxy groups per surfactant molecule; c) from 5 to 10% w / w of a cellulose derivative that swells with water, or a salt thereof, wherein the cellulose derivative exhibits a viscosity of at least about 1500 cps, more preferably a viscosity of 1500 at 3500 cps, measured in a 1% aqueous solution at 25 ° C, with a Brookfield viscometer (spindle 3, speed 30 rpm, factor 40 for viscosities of 2500 to 3500 cps); d) from 6 to 20% w / w of a solubility regulator selected from sulfates, carbonates and chlorides of alkali metal and alkaline earth metal, aluminosilicates and starch; and e) from 0 to 20% w / w of a fragrance (perfume).

P1478 / 99 All percentages p / p mentioned here are based on the weight of the total composition.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES The anionic detergents (component (a)) for use in the compositions of the invention are powder-based compositions with good texturizing properties, and are preferably linear C6-24 alkyl benzenesulfonic acids, alpha sulfonates. olefin and / or natural detergent agents. Suitable natural detergent agents include saponified fatty acids having an anionic function, such as, for example, coconut soap powder, tallow soap powder, palm soap powder, palm seed soap powder, oil-based soaps of soybeans and / or sunflower oil, and mixtures of any of these. More preferably, the anionic detergents are the sodium salt of linear C6-24 alkyl benzenesulfonic acid (sodium LABSA), sodium lauryl sulfate and / or walnut soap powder. Especially preferred is when the alkyl chain is C? O-? ß #, more especially C12-14, such as C? 2, for example, those available under the tradename Nansa HS 80 and Nansa LSS 80 from Albright & Wilson, UK. Preferably, the anionic detergent is present in the range of from 40 to 55%, more preferably approximately 50% w / w. Non-ionic detergents (component (b)) P1478 / 99 for use in the compositions of the invention, are also powder-based detergents and are preferably alkoxylated alkylphenols, such as, for example, an ethoxylated nonylphenol having from 2 to 5 moles, for example, from 3 to 4.5 moles, of ethylene oxide per molecule. More preferably, the length of the alkyl chain of these detergents in the range of from Cs to Co., especially C? to Cis, more especially Ci6 to Cie, for example, those having a chain length of Cl4 to C6 as those available under the trade name Synperonic from ICI, UK. Preferably, the non-ionic detergent is present in the range of 4 to 8%, more preferably about 5 to 7% w / w. The cellulose derivative (component (c)) is preferably carboxymethylcellulose or a salt thereof, although other derivatives such as for example hydroxyethylcellulose and hydroxypropylmethylcellulose can be used. It is more preferably present, as the sodium salt thereof and preferably has a viscosity in the range of from about 2000 to 3500 cps (inclusive), more preferably 1500 to 2500 cps. Conveniently, the cellulose derivative has a pH in the range of 7 to 8.5 (aqueous 1%). It is especially preferred when the composition comprises approximately 6 to 10%, for example P1478 / 99 about 8% of the cellulose derivative. A preferred cellulose derivative for use in the compositions of this invention is available from Reliance Cellulose Products Ltd. (Secunderabad), India, under the tradename Hercules SP 60. The solubility regulator (component (d)) is preferably selected, of sulfates and chlorides of alkali metals and alkaline earth metals, although carbonate aluminosilicates (zeolites) and starch are more suitable. Sodium sulfate anhydrous is more preferred. Preferably, the solubility regulator is present in the range of from 8 to 15%, more preferably, from 8 to 13%, especially from 10 to 12% w / w. The fragrance (component (e)) is preferably present in the range of 5 to 16%, for example about 6% w / w and can be in the form of solid, liquid or microencapsulated. Although particularly suitable for use ITC, these components can also be used as blocks for toilet cleaning ITB (In The Bowl - in the cup); for example, the compositions can be formulated as one month toilet blocks ITC or ITB. Preferably, the composition according to the invention is formulated as a toilet block of 25 to 75 g, with more P1478 / 99, from 48 to 55 g and, is conveniently provided in an envelope or envelope of a water-soluble polymer film, such as, for example, a polyvinyl alcohol-based film that dissolves on contact with water. The compositions according to the invention, optionally but preferably, also comprise from 1 to 10% w / w, preferably from approximately 3 to 5%, more preferably approximately 5% of a tartar protector or inhibitor, such as a salt of Tetrasodium hydroxyethylidene-1,1-diphosphonic acid (HEDP) or ethylenediaminetetraacetic acid (EDTA), or salts (preferably, sodium salts) of acids neither trolotetra-acetic, citric or gluconic. The compositions according to the invention, optionally but preferably, also comprise from 1 to 30% w / w, preferably from 1 to 10%, more preferably from 2 to 5%, especially from approximately 2% of a foam accelerator and / or foam stabilizer, such as, for example, cocomonoethanolamide or a salt thereof. The compositions according to the invention, optionally but preferably, also comprise from 4 to 10% w / w, preferably from 4 to 8%, more preferably from 5 to 7%, especially from about 5% of one or more agents of inert fillers, such as those selected from silica, P1478 / 99 bentonites and clays, starch and alkali metal carbonates and sulfates. Preferably, silica is selected and, more preferably, any fragrance present is adsorbed on the silica particles. The compositions according to the invention, optionally but preferably also comprise from 0.3 to 10% w / w, preferably from 0.3 to 5%, more preferably from 0.5 to 2%, especially from about 0.5% of a disinfectant or germicide, such as those selected from trichlorocarbanilide, triclosan, para-dichlorobenzene, para-chlorometa-xylenol, ortho-benzyl-p-dichlorophenol and benzyl cresol. The compositions according to the invention, optionally but preferably also comprise from 1 to 10% w / w, preferably from 5 to 7%, more preferably approximately 6% of a dye or pigment, such as for example a water-soluble dye or dispersible in water. Examples of dyes are acidic dyes, for example, blue acid dyes, in liquid or solid form. It has been found that the compositions according to the invention perform consistently well with respect to perfume release properties, foam and color, during use in the tank, ie, that the performance (efficiency) of the block is substantially uniform during its validity.

P1478 / 99 The toilet blocks can be manufactured by a combination of conventional steps of the known components. For example, the blocks are conveniently formed by a process comprising mixing, extruding and cutting, optionally followed by compression / tabletting. Where a filler such as silica and a fragrance are used together, as preferred, there may be an additional step which comprises coating the filler material with the fragrance. The preferred process comprises providing a matrix of the cellulose derivative that swells with the water (component (c)) having microchannels or micelles therein and depositing in the matrix the anionic and nonionic detergents (components (a) and (b)) and optionally, other components (especially the dye, the foaming agent (foam accelerator) and the like). The cellulose derivative that swells with water therefore acts as a slow or controlled release agent, which controls the release of detergents and other components, rather than conventionally as a binder or tablet former. Therefore, the present invention further provides a method for making a block for toilet, which method comprises putting in physical mixture: (a) from 35 to 65% w / w of a detergent P1478 / 99 anionic (surfactant) selected from alkyl benzenesulfonic acids, alpha-olefin sulfonates, long-chain fatty acid sulfates, higher fatty acids, as well as the alkali metal and alkaline earth metal salts thereof and natural detergent agents, and mixtures of any of these; b) from 3 to 15% w / w of nonionic detergents (surfactants) selected from alkoxylated alkylphenols and alkoxylated fatty alcohols; c) from 5 to 10% w / w of a cellulose derivative that swells with water, or a salt thereof, wherein the cellulose derivative exhibits a viscosity of at least about 1500 cps, measured in an aqueous solution at 1% at 25 ° C, with a Brookfield viscometer (spindle 3, speed 30 rpm, factor 40 for viscosities of 2500 to 3500 cps); d) from 6 to 20% w / w of a solubility regulator selected from sulfates, carbonates and chlorides of alkali metal and alkaline earth metal, aluminosilicates and starch; and e) from 0 to 20% of a fragrance (perfume); and extruding the mixture formed in this manner and, optionally, then compressing the resulting extrusion. The mixture to be extruded should contain from 5 to 25% w / w by weight of a liquid component or a solid component which is liquefied under the conditions of P1478 / 99 extrusion to act as a process adjuvant. The process adjuvants can be selected from appropriate ingredients mentioned hereinabove, especially the non-ionic detergent, the perfume and any foam accelerator, or other excipients known to be effective for this purpose. The resulting blocks can be wrapped in water-soluble PVA fabric and with a foldable wrap with a heat-shrinking, thermally controlled machine before being packaged inside a PVC blister pack to protect them from moisture and other atmospheric gases. The present invention, therefore, further provides the use of a block extruded composition, in accordance with the invention, for the cleaning of toilets; and a method for cleaning toilets, the method comprising contacting an extruded block in accordance with the present invention with the flushing water of the toilet, for example by placing the block in the cistern or in the toilet bowl. The invention will now be illustrated by means of the following Examples.

P1478 / 99 EXAMPLES EXAMPLE 1 - Extruded Block for Toilet for Use in La Cisterna. A composition is made by mixing the following components together, according to the method indicated below.

Ingredient composition p / p Sodium salt of alkyl 50.0% linear benzenesulfonic acid (anionic detergent) Nonyl phenol ethoxylated having 4.5 moles 5.0% ethylene oxide (non-ionic detergent) Cocomonoethanolamide (foam accelerator) 2.0% Sodium carboxymethylcellulose (substance 8.0% slow release) HEDP tetrasodium (protective against tartar) 5.0% Trichlorocarbanilide (disinfectant) 0.5% Acid blue 1 (colorant) 6.0% Lavender (fragrance) 6.0% Anhydrous sodium sulfate (regulator of '12.5% solubility) Silica powder (coating agent - 5.0% fragrance) The blocks with the above composition are conveniently formed by a four-step process, as follows: P1478 / 99 - Fragrance Recap: The silica is taken in a container and the fragrance is sprayed by means of a spray gun with continuous mixing until the total fragrance is evenly coated on the silica. Mixing: The required amount of sodium salt of linear alkyl benzenesulfonic acid [or other anionic detergent (s)] is charged into a Sigma mixer. The non-ionic detergent (ethoxylated nonyl phenol / fatty alcohol) is slowly added to it with continuous mixing until a homogeneous semi-solid mass is obtained. The fragrance coated silica and the solubility regulator (anhydrous sodium sulfate) are added to the mixer and mixed for approximately 10 minutes to ensure homogeneity. Separately, the cocomonoethanolamide (foam accelerator) is passed through a three roll mill, added to the mixer and mixed for 5 minutes. The trichlorocarbanilide (germicide) and the HEDP tetrasodium (protector against tartar) are added and mixed for 5 to 7 minutes. The sodium carboxymethylcellulose is then added and mixed for 7 minutes. The color is finally added and mixed until a semi-solid mass is obtained. It will be understood that a different order is possible in the addition of the components to the P1478 / 99 mixer. Extrusion: The mass is then transferred to a bar extruder / extruder and molded into a roller (although other shapes may be used, if desired). Cutting and compression: The roller is cut by means of a cutter suitable to the appropriate weight of the block, and the individual block is subjected to suitable matrix cavities and compressed with pressure of 2 to 15 tons, in the final form. The mixture to be extruded must contain from 5 to 25% by weight of a liquid or a solid component that is liquefied under pressure conditions for extrusion (2-15 tons) to act as a processing lubricant auxiliary. In this composition, the ethoxylated nonyl phenol, the cocomonoethanolamide and the fragrance provide this. The resulting blocks are wrapped in water-soluble PVA fabric and in folded wrap, with a heating / folding machine, thermally controlled. This is finally packaged in PVC blister packaging to protect it from moisture and other atmospheric gases.

EXAMPLE 2 - Extruded Block for Toilet for Use in The Cistern A composition is made by mixing and extruding the following components together, P1478 / 99 by means of a method analogous to that of Example 1.

Ingredient composition P / P Sodium salt of linear alkyl benzenesulfonic acid 25.0% (anionic detergent) Sodium lauryl sulfate 25.0% Ethoxylated nonyl phenol having 4.5 moles 5.0% ethylene oxide (nonionic detergent) Sodium carboxymethylcellulose (substance 8.0% slow release) Tetrasodium HEDP (protective against tartar) 5.0% Trichlorocarbanilide (disinfectant) 0.5% Acid blue 1 (colorant) 6.0% Lavender (liquid fragrance) 6.0% Solid fragrance 6.0% Anhydrous sodium sulfate (regulator of 8.5% solubility) Silica powder (coating agent - 5.0% fragrance) EXAMPLE 3 - Extruded Block for Toilet for Use in the Cistern A composition is prepared by mixing and extruding the following components together, by a method analogous to that of Example 1.

P1478 / 99 Ingredient composition p / p Sodium salt of alkyl acid 40.0% linear benzenesulfonic (anionic detergent) Ethoxylated fatty alcohol having 3 moles 5.0% ethylene oxide (non-ionic detergent) Nut soap powder (10.0% natural detergent) Sodium carboxymethylcellulose (substance 8.0% slow release) HEDP Tetrasodium (protective against tartar) 5.0% Trichlorocarbanilide (disinfectant) 0.5% Acid blue 1 (colorant) 6.0% Lavender (fragrance) 6.0% Anhydrous sodium sulfate (regulator of 14.5% solubility) Silica powder (coating agent - 5.0% fragrance) EXAMPLE 4 - Extruded Block for Toilet for Use in the Cistern In a manner similar to that described for Example 1, but omitting the step of silica coating, the following ingredients were formulated in an extruded ITC block.

Ingredient composition p / p Sodium salt of 50% alkyl acid P1478 / 99 linear benzenesulfonic (anionic surfactant) Nonyl phenol ethoxylated having 4.5 moles 5% ethylene oxide (nonionic surfactant) Cocomonoethanolamide (foam accelerator) 2% Sodium carboxymethylcellulose (8% dissolution control agent) HEDP Tetrasodium (protective / 5% tartar inhibitor) Trichlorocarbanilide (germicidal agent) 0.5% Acid blue 1 (dye) 6% Lavender in liquid (fragrance) 6% Anhydrous sodium sulfate (regulator of 17.5% solubility) EXAMPLE 5 - Extruded Block for Toilet for Use in the Cup Similar to that described for Example 1, the following ingredients were formulated in an extruded block ITB.

Ingredient composition p / p Nansa HS 80 (linear alkyl sulfonate, 48% 80%) (anionic surfactant) Nansa LSS 80 (alpha-olefin sulfonate, 10% 80%) (anionic surfactant) Nonylphenol, ethoxylated with 4.5 moles of 8% P1478 / 99 Ethylene oxide (non-ionic surfactant, ICI) Sodium carboxymethylcellulose (6% dissolution control agent) Silica powder (coating agent - 4% fragrance) Perfume 8% Anhydrous sodium sulfate (12% solubility regulator) 4% sodium citrate EXAMPLE 6 - Extruded Block for Toilet to be Used in the Cup Similar to that described for Example 1, the following ingredients were formulated in an extruded block ITB.

Ingredient composition P / P Nansa HS 80 (linear alkyl sulfonate, 30% 80%) (anionic surfactant) Nansa LSS 80 (alpha-olefin sulfonate) 10% (non-ionic surfactant) Nonylphenol ethoxylated with 4.5 moles of 8% ethylene oxide (non-ionic surfactant, ICI) Sodium carboxymethylcellulose (10% agent dissolution control) Silica powder (coating agent - 6% P1478 / 99 fragrance) Perfume '20% Anhydrous sodium sulfate (12% solubility regulator) 4% sodium citrate P1478 / 99

Claims (10)

1. NOVELTY OF THE INVENTION Having described the present invention, it is considered as a novelty and, therefore, the content of the following CLAIMS is claimed as property; A composition suitable for use as an extruded block of the type used within the tank or in the toilet bowl, comprising: (a) from 35 to 65% w / w of an anionic detergent (surfactant) selected from alkyl acids benzenesulfonic, alpha-olefin sulfonates, long-chain fatty acid sulfates, higher fatty acids, as well as the alkali metal and alkaline earth metal salts thereof and natural detergent agents, and mixtures of any of these; b) from 3 to 15% w / w of a non-ionic detergent (surfactant) selected from alkoxylated alkylphenols and alkoxylated fatty alcohols; c) from 5 to 10% w / w of a cellulose derivative that swells with water or a salt thereof, wherein the cellulose derivative exhibits a viscosity of at least about 1500 cps, measured in a 1% aqueous solution at 25 ° C, with a Brookfield viscometer (spindle 3, speed 30 rpm, factor 40 for viscosities of 2500 to 3500 cps); d) from 6 to 20% w / w of a solubility regulator selected from sulfates, carbonates and P1478 / 99 alkali metal and alkaline earth metal chlorides, aluminosilicates and starch; and e) from 0 to 20% w / w of a fragrance (fragrance ) .
2. 2. A composition according to the claim 1 or 2, wherein the cellulose derivative has a viscosity in the range of from 1500 to 2500 cps (inclusive).
3. 3. A composition according to claim 1, wherein the cellulose derivative is carboxymethylcellulose or a salt thereof.
4. 4. A composition according to any preceding claim, wherein the anionic detergent (component (a)) is selected from linear C6-24 alkyl benzenesulfonic acids, alpha-olefin sulphonates, sodium lauryl sulfate based on powder, and natural detergent agents, and mixtures thereof. A composition according to any one of the preceding claims, wherein the nonionic detergent (component (b)), is selected from alkoxylated alkylphenols with a powder base, having from 2 to 5 moles, for example from 3 to 4.
5. 5 moles, of ethylene oxide per molecule.
6. 6. A composition according to any of the preceding claims, further comprising one or more of the following: (a) 1 to 10% w / w of a protector or inhibitor P1478 / 99 of tartar; (b) 1 to 30% w / w of a foam accelerator and / or foam stabilizer; (c) 4 to 10% w / w of one or more inert filler materials; (d) 0.3 to 10% w / w of a germicide or disinfectant; (e) 1 to 10% w / w of a dye or pigment.
7. 7. A composition according to any of the preceding claims, wherein the perfume or fragrance is adsorbed on silica.
8. 8. A composition according to any of the preceding claims, comprising, based on w / w of the total composition: (a) 25 to 65% of a linear C6.21 alkyl benzenesulfonic acid sodium salt and / or sulfonates of alpha-olefin, with powder base; (b) 4 to 8% of an ethoxylated nonylphenol with 2 to 5 moles of ethylene oxide, with a powder base; (c) 6 to 10% of the sodium salt of carboxymethylcellulose in which the polymer chain is such that the viscosity of a 1% solution in water is in the range of 2000 to 3500 (inclusive) cps at 25 ° C; (d) 8 to 18% anhydrous sodium sulfate; P1478 / 99 (e) 5 to 16% fragrance; (f) 3 to 10% tetrasodium hydroxyethylidene-1-diphosphonic acid; (g) 1 to 10% cocomonoethanolamide; (h) 4 to 8% silica; (i) 3 to 5% trichlorocarbanilide; and (j) 5 to 10% acid blue dye.
9. 9. A method for making a block for toilet, the method comprises putting in physical mixture: (a) from 35 to 65% w / w of an anionic detergent (surfactant) selected from alkyl benzenesulfonic acids, alpha-olefin sulphonates , long chain fatty acid sulfates, higher fatty acids, as well as the alkali metal and alkaline earth metal salts thereof and natural detergent agents, and mixtures of any of these; b) from 3 to 15% w / w of a non-ionic detergent (surfactant) selected from alkoxylated alkylphenols and alkoxylated fatty alcohols; c) from 5 to 10% w / w of a cellulose derivative that swells with water, or a salt thereof, wherein the cellulose derivative exhibits a viscosity of at least about 1500 cps, measured in an aqueous solution at 1% at 25 ° C, with a Brookfield viscometer (spindle 3, speed 30 rpm, factor 40 for viscosities of 2500 to 3500 cps); P1478 / 99 d) from 6 to 20% of a solubility regulator selected from sulfates, carbonates and chlorides of alkali metal and alkaline earth metal, aluminosilicates and starch; and e) from 0 to 20% of a fragrance (perfume). and extruding the mixture formed in this manner; and optionally, then compressing the resulting extrusion. A method according to claim 9, comprising the additional step of adsorbing the fragrance in the range of 4 to 10% w / w in an inert filler material, such as for example silica. P1478 / 99