MXPA99009746A - Chlorinated in-tank toilet cleansing block - Google Patents

Abstract

Disclosed herein is a toilet cleansing block containing a chlorine releasing agent. A preferred block is formulated with a cellulose ether to prolong life, a dye, and a stabilizer to suppress adverse interactions between the chlorine releasing agent and the cellulose ether, as well as between the chlorine releasing agent and the dye.

Description

CLEANING BLOCK WITHIN THE ESCUSADOS TANK TECHNICAL FIELD The present invention relates to cleaning blocks suitable for immersing them in toilet blocks. The blocks are formulated to inhibit the formation of rings and superficial stains in the toilet. BACKGROUND ART Several cleaning blocks are known for use in toilet tanks and other water tanks. Said cleaning blocks normally contain a surfactant for cleaning, and frequently, fillers, binders, colorants, extrusion aids and perfume. They are designed to slowly release these materials into the toilet bowl each time the toilet is discharged. A particularly convenient form of said cleaning blocks is that which releases chlorine compounds in the water supply to help clean and disinfect the toilet bowl. See, for example, the U.S. Patent. 5,336,427. However, chlorinated cleaning blocks can have a relatively short life. EP-A-0 462 643 discloses a sink cleaning block comprising 30 to 80% by weight of an anionic surfactant; or 50% by weight of an inert filler or electrolyte; from 5 to 50% by weight of bleaching agent, preferably potassium dichlorocyanurate; and from 5 to 15% by weight of a hydrophobic structurant, preferably an oily liquid perfume. The creation of chlorinated cleaning blocks with a longer life has been a major challenge. Among other things, such cleaning blocks should not include materials that leave undesirable residues in the toilet bowl, which are not environmentally acceptable, have unpleasant odors, or are incompatible with other components. For example, it is known that cellulose ether binders prolong the life of some toilet cleaning blocks. See, for example, the patent of E. U.A. 4,269,723. However, they can be unstable in the presence of compounds that release chlorine. Also, compounds that release chlorine can interfere with some dyes used in such blocks. Therefore, it can be seen that there is a need for an improved chlorinated toilet cleaning block. Description of the Invention In one aspect, the invention provides a water reservoir cleaner, in block form, with a mixture of 1% to 60% of a chlorine release agent selected from the group consisting of chloroisocyanurates, hypochlorites, chlorosuccinimides. , chloramine T (paratoluen-sodium sulfochloride) and chlorodimethyl hydantoins; from 1% to 20% cellulose ether binder; a dye and at least 10% of a surfactant (preferably, an anionic surfactant). Also at least there is 2% of a stabilizer selected from the group consisting of mineral oil, isobornyl acetate, linear C12-C20 alcohols and fragrance oils having a specific gravity less than 1 and are stable to bleaches, i.e. , stable to chlorine. Examples of fragrance oils of this type are pine oil, Quest Q-7940A (Quest International Fragrances USA Inc., herbal / pine), IFF Cloriffic 630 (International Flavors and Fragrances Inc. - lemon / citrus) and Takasago AG 4761 -BHT (Takasago International Corporation - apple). It is especially preferred that said fragrance oils have a specific gravity between 0.83 and 0.98 and can essentially be insoluble in water. An especially preferred fragrance oil is Unipine 85, a pine oil from Bushe, Boake and Alien, Inc. This fragrance oil has the additional advantage of facilitating the extrusion of the blocks during manufacture. One test that can be carried out to determine if a fragrance is stable to chlorine is as follows. A small amount of solid chlorine containing the compound is placed in a beaker. A sufficient amount of fragrance is added to coat substantially all of the particulate material. The sample is observed periodically for a period of 24 hours. The fragrance is considered stable while (1) there is no observable chemical reaction (eg, exothermic combustion); (2) there is no detectable strong chlorine odor from the sample; (3) there is no discoloration of the sample; and (4) the characteristic scent of fragrance does not change significantly. To achieve a long life, a cellulose ether binder is included in the block. Preferred cellulose ether binders are hydrated cellulose materials such as hydroxyalkyl celluloses as well as hydroxyethyl cellulose, hydroxypropyl methyl cellulose and hydroxypropyl cellulose. Examples of other cellulose ether binders are methyl cellulose, ethyl cellulose, sodium carboxymethyl cellulose, ethyl hydroxyethyl cellulose, and carboxymethyl cellulose. It is thought that the stabilizer reduces the hydrolyzing effect of the bleach in the cellulose ether binder. For toilet cleaning blocks, anionic surfactants are especially preferred, such as sodium docecyl benzenesulfonate and sodium lauryl sulfate. However, a wide variety of surfactants (anionic, nonionic, cationic, zwitterionic) are suitable for use in toilet cleaning blocks (see, for example, 5,336,427). Preferred chlorine release agents are alkali metal and alkaline earth metal hypochlorites and alkali metal dichloroisocyanurates. Surprisingly, although the block has a bleach, the block also includes a colorant. In this regard, we have found that the stabilizer also reduces the oxidation effect of the bleach in colorant. The choice of dye / dyeing agent will largely depend on the color desired for the water in which the washroom cleaning composition will be dispensed and its tendency not to stain the porcelain. A preferred coloring agent is Acid Blue 9. Other suitable colorants were described in the U.S.A. 5,336,427. The amount of coloring agent or dye that will be dispensed into the water will depend on the intensity of color desired and the cost of the colorant. The absorbance of the coloring agent can be determined for cleaning purposes by the use of a visible spectrophotometer, such as a Perkin-Elmer Model 552 spectrophotometer. The amount of coloring agent supplied in the toilet bowl should be sufficient to provide an absorbance in a 1 cm spectrophotometer cell of approximately 0.02 absorbance units ("ua") to about 0.2 ua when measured at its maximum wavelength. This is because consumers usually think that a colored cleaning product no longer works when it has a color intensity below this scale. Also, a filler / density aid and other conventional additives such as borax or ascorbic acid may be included. For example, to achieve adequate density so that the block will not float and to minimize costs, inert filler / density auxiliaries are preferably added. Inert salts are preferred for this purpose so that inorganic or organic salts soluble in water (or mixtures of said salts). Examples include various sulfates, chlorides, borates and citrates of alkali and / or alkaline earth metals. Specific inert salts are sodium sulfate, sodium sulfonate, calcium sulfate, sodium chloride, potassium sulfate, sodium carbonate, lithium chloride, tripotassium phosphate, sodium borate, potassium fluoride, calcium chloride, chloride of magnesium, sodium citrate, magnesium sulfate and sodium fluoride. The fill / density auxiliary is normally present in an amount of from about 0% to about 60%, preferably from about 10% to about 40% by weight. In another embodiment, the invention provides a method for cleaning a toilet bowl. One of the above blocks is dipped into a water reservoir for a toilet bowl, first a portion of the block dissolves in the water in the toilet tank and then discharges the toilet. The objects of the present invention therefore include the provision of a water reservoir cleaner of the above class: (a) it is effective to inhibit stain formation in the toilet bowl; (b) keeps toilet bowls in a clean condition for an extended period. (c) uses environmentally acceptable and inexpensive components; and (d) compatibly utilizes a chlorine release agent for cleaning, a cellulose ether for extended life and a dye to provide an easy way to indicate to a consumer when a site is needed. Still other objects and advantages of the present invention (e.g., methods for using these blocks) will be apparent from the following description. The following description is merely of the preferred embodiments. Therefore, the claims must be taken into account to understand the full scope of the invention. Modes for Carrying Out the Invention The cleaning blocks for use in a toilet tank are: Example I - Control - Without Stabilizer Ingredient% in Weight Sodium dichloroisocyanurate, 60% active 6% Hydroxy ethylcellulose 5% Dodecyl sodium benzenesulfonate, 60% 85% active (Ufaryl DL-85) Sodium sulfate 19% Borax 5M 10% Example II - Alcohol and Fragrance Oil Ingredient% in Weight Sodium dichloroisocyanurate, 60% active 6% Hydroxyethylcellulose 5% Dodecyl benzene sulfonate 60% 85% active (Ufaryl DL-85) Neodol 23 (C-12 / C13 primary linear alcohol) 3.5% Borax 10% Sulfate sodium 12% Fragrance oil 3.5% Example III - Alcohol Ingredient% in Weight Sodium dichloroisocyanurate, 60% active 6% Hydroxyethylcellulose 5% Dodecyl benzene sulfonate 60% 85% active (Ufaryl DL-85) Neodol 23 (C12 C13 primary linear alcohol) 7% Borax 10% Sodium sulfate 12% Example IV - Oil with Fragrance Ingredient% in Weight Sodium dichloroisocyanurate, 60% active 6% Hydroxyethylcellulose 5% Dodecyl benzene sulfonate 60% 85% active (Ufaryl DL-85) Borax 5M 10% Sodium sulfate 12% Oil with fragrance 7% Example V - Pine Oil and Coloring Ingredient% in Weight Sodium dichloroisocyanurate, 60% active Hydroxyethylcellulose 5% Dodecyl benzene sulfonate 60% 85% active (Ufaryl DL-85) Dye Blue acid # 9 8% Sodium sulfate 11% Pine oil, Unipine 85 10% E - use VI - High chlorine content Ingredient% in Weight Sodium dichloroisocyanurate, 60% active 27% Hydroxyethylcellulose 3% Dodecyl sodium benzenesulfonate 60% 85% active (Ufaryl DL-85) Pine oil, Unipine 85 10% In other preferred formulations, a total surfactant agent is preferably between 40 and 80%, the total cellulose ether is preferably between 1 and 20% (even more preferably between 5 and 15%) and the chlorine releasing agent is preferably between 1 and 20%. and 60% (even more preferably between 5 and 40%) of the block The total stabilizer preferably between 2 and 20% of the block, even more preferably between 4 and 12% When a dye is used, preferably between 1 and 20% of the block ( v gr, 10% of the block when Acid Blue # 9 is used) To form blocks of the present invention, preferably we first create a homogeneous mixture using a mixer such as a strip mixer The mix is then fed into the barrel of an extruder of screw and it is passed through the extruder to form a continuous extrudate which is then cut to the desired block size. The pressure across the die can be from about 345 to 862 MPa. The barrel of the Extruder can be maintained at least at 35 ° C (v gr, an ambient temperature) by means of cooling water circulated through an external barrel sleeve die head can be heated to ensure a more uniform surface extrudate of the product The block in the form of continuous extrusion it starts to cure when exiting the extruder and therefore can be cut into cleaning blocks of the required size by conventional cutting means downstream of the die and before substantially completing the cure. The "block" does not need to be rectangular It can be a tablet, disk, partition or other solid mass, with or without cracks, holes or similar, it does not need to be formed by extrusion (however extrusion is carried out) Therefore, it is not intended that any mass in solid form be a "block" for the purposes of this patent To test the blocks of the present invention, we place said blocks in a conventional toilet tank (1325 liters ) Kohler We periodically discharge the toilet through a protocol that represents the average use by the consumer 810 downloads per day, without discharges between 11 PM and 8 AM, etc.) Periodically, we tested and inspected if any of the blocks remained in the tank. toilet Results As an example, using blocks of 50 1 g - 50 3 g made from Examples 1 (Control) and VI, the life of the blocks was as follows Example 1 - 7 days Example IV - 35 days Therefore, the stabilizer greatly increased the service life of the chlorinated block

Claims (7)

1. Industrial Applicability The invention is useful for maintaining the cleanliness of toilet bowls associated with toilet tanks.
2. It also has aphcabihdad in other water storage systems (v gr, tanks for urinals) CLAIMS 1 In a water reservoir cleaner in the form of a block having (a) from 1% to 60% by weight of chlorine release agent selected from the group consisting of chloroisocyanurates, hypochlorites, chlorosuccinimides, para-toluene-sodium sulfochloride and chlorodimethyl hydatidones, and (b) less 10% by weight of a surfactant, the improvement being that the block also comprise at least 2% by weight of stabilizer selected from the group consisting of mineral oil, isobornyl acetate, linear C12-C20 alcohols, and bleach-stable fragrances having a specific gravity of less than 1, a dye, and 1% to 20% by weight of cellulose ether binder, and that the chlorine-releasing agent, is tabilizer, colorant, binder and surfactant are mixed together The cleaner of claim 1, wherein the surfactant is an ammonium surfactant agent
3. 3 The cleaner of claim 1, wherein the surfactant is sodium dodecylbenzenesulfonate.
4. 4. The cleaner of claim 1, wherein the dye is Acid Blue 9.
5. The cleaner of claim 1, wherein the chlorine releasing agent is selected from the group consisting of chloroisocyanurates, hypochlorites, chlorosuccinimides, chloramine T and chlorodimethyl. hydantoins.
6. 6. The cleaner of claim 1, wherein the cellulose ether binder is a hydroxyalkyl cellulose.
7. 7. In a method of cleaning a toilet bowl, which has the steps of immersing a cleanser in a water reservoir for the toilet bowl, dissolving a portion of the block in water in a toilet tank and discharging the toilet, improvement comprising that the cleaner is a cleaner block of claim 1.