WO2019115830A1

WO2019115830A1 - Chlorine tablet packaging

Info

Publication number: WO2019115830A1
Application number: PCT/EP2018/085296
Authority: WO
Inventors: Maryline SANCHEZ; Valérie VENET; Lisa NGUON
Original assignee: Eurotab
Priority date: 2017-12-15
Filing date: 2018-12-17
Publication date: 2019-06-20

Abstract

The present invention relates to a packaging comprising at least one tablet individually wrapped in a polymer film, characterised in that the tablet comprises 5% to 100% active chlorine releasing agent, and the method for preparing same. The present invention also relates to the use of a polymer film for individual wrapping of a tablet intended to be placed in a packaging, characterised in that the tablet comprises 5% to 100% active chlorine releasing agent.

Description

PACKAGING FOR CHLORINATED TABLET

The present invention belongs to the field of chlorinated tablets. The present invention relates to a package comprising at least one chlorinated tablet unitarily wrapped in a polymeric film. The present invention also relates to the use of a polymeric film to individually wrap a chlorinated tablet to be placed in a package.

In the field of chlorinated tablets, especially for disinfection or bleaching, two major problems arise in terms of packaging.

The first problem is that the chlorinated tablet releases a chlorine gas; Several disadvantages are then highlighted. When the consumer opens the package containing the tablets, a strong smell of chlorine emerges from the packaging. This smell is unpleasant for the consumer. The consumer has a bad perception of the product when handling it since it is in direct contact with the chemical. An odor may persist on the hands even after washing, there may also be risks of allergies. Another disadvantage is the swelling of the packages containing the tablets. This problem entails the need to use leaky packaging to evacuate the gases emitted. The use of unsealed packaging leads to a reduction in shelf stability.

The second problem is the disintegration and dissolution of chlorinated tablets. The chlorinated tablets currently found on the market do not exhibit both good disintegration and good dissolution of the active chlorine releasing agent. A disintegration time of the tablet less than 5 minutes leads to many residues of undissolved chlorine agents. This results in a loss of efficiency, especially for tablets intended to disinfect the toilet bowl where it is not possible to stir the solution. In order to guarantee good dissolution of the granules of chlorinated agents, it is necessary to slow down the disintegration of the tablet, which is a disadvantage for the consumer because he has to wait to use the prepared solution.

International application WO 2007/130817 relates to a hydrosoluble film resistant to halogens. The chlorinated product packaged in said water-soluble film is not stored in a sealed package, which poses a problem of stability of the product over time, especially when the product is stored in wet conditions or strong heat.

The present invention relates to a package (3) comprising at least one tablet (1) individually wrapped in a polymeric film (2), characterized in that the tablet comprises from 5% to 100%, preferably from 5% to 99%, 9% agent releasing active chlorine.

The present invention also relates to the use of a polymeric film (2) for unitarily wrapping a tablet (1) intended to be placed in a package (3), characterized in that the tablet comprises from 5% to 100% by weight. weight, preferably 5% to 99.9% by weight of active chlorine releasing agent, based on the total weight of the tablet.

The inventors have surprisingly discovered that the addition of a polymeric film (primary packaging) around a chlorinated tablet makes it possible to avoid the release of the chlorine gases in the secondary packaging and thus to avoid the unpleasant odor during of the opening.

In addition, to date, the problem of swelling and undesirable coloring of secondary packaging containing chlorinated products has never been addressed in the prior art. Indeed, according to the general knowledge of the skilled person at the date of the present invention, this problem results solely from exposure to moisture, poor closure of the packaging, or any other reason related to the external environment. Thus, the inventors have discovered that the swelling and the undesirable coloring of the secondary packaging containing chlorinated products were not due to the external environment but were due to the release of the chlorine by the chlorinated tablet. The inventors then discovered that the addition of a polymeric film (primary packaging) around a chlorinated tablet makes it possible to avoid the release of the chlorinated gases in the secondary packaging and thus to prevent the swelling and the undesirable coloration of the secondary packaging containing the said chlorinated products.

Preventing the release of chlorine gases thus improves the strength and stability of the tablet and secondary packaging over time. In addition, the secondary packaging can be completely sealed to the outside environment without risking swelling or undesirable coloring, thus improving the stability of the product. It is therefore possible to store chlorine tablets in all types of secondary packaging, including sealed packaging, without risk of tampering.

The inventors have also surprisingly discovered that when the tablet is packaged in a water-soluble polymeric film, it was possible to obtain, in aqueous solution, both a good disintegration of the tablet as well as a good dissolution of the active chlorine releasing agent in the solution, and this for fast disintegration times, that is to say less than 5 minutes. This allows to quickly obtain a solution releasing active chlorine, used by the consumer almost immediately and especially without agitation. For example, this invention makes it possible to meet the disadvantages posed in the context of the disinfection of toilet bowls where the agitation is difficult. This also makes it possible not to have to remove the polymeric film which limits the number of handling to be performed.

The present invention thus makes it possible to propose a solution to the various disadvantages encountered in the prior art.

Thus, the subject of the present invention is mainly a package (3) comprising at least one tablet (1) individually wrapped in a polymeric film (2), characterized in that the tablet comprises from 5% to 100% by weight, preferably from 5% to 99.9% by weight of active chlorine releasing agent, based on the total weight of the tablet.

Packaging

In the context of the present invention, the package (3), also called secondary packaging, can be any type of packaging for storing tablets. Advantageously, the package is a bag, a pot, a case, a box, a box or a bucket. The packaging can be in any type of material, such as plastic, cardboard, metal or glass.

In a preferred manner, the package according to the invention is a sachet.

Preferably, the package according to the invention is a sealed package, preferably a waterproof bag.

In the context of the present invention, sealed packaging means all types of containers which, in the closed state, are sealed with the external environment, that is to say which prohibit all circulation between their internal environment and the environment. 'outside. The sealed package is especially impervious to all types of gas, especially air, water and water vapor. The terms hermetic package can be used synonymously. In the context of the present invention, the sealed package may be considered as a secondary packaging of the tablet (1).

The sealed package may advantageously be in the form of a bag, a pot, a case, a box, a box or a bucket, preferably the sealed package is a bag.

The sealed package may be composed for example of simple plastics such as polyethylene terephthalate (PET), polyethylene (PE), polystyrene (PS), polyvinyl chloride (PCV), polypropylene (PP) or complexed plastics including polyethylene terephthalate (PET), polyethylene (PE), polyethylene terephthalate (PET), polystyrene (PS), polyvinyl chloride (PCV), polypropylene (PP), aluminum, paper such as kraft paper or paper made from recycled fibers, ethylene vinyl alcohol copolymer (EVOH), PET with SiOx treatment, polyamide (PA) or mixtures thereof. Preferably, the sealed package is composed of a PET / PE complex.

Advantageously, the package, especially the sealed package is closed according to methods known to those skilled in the art such as heat sealing or cold sealing, screwing and all other methods known to those skilled in the art. The method of closing the package, including the sealed package can easily be adapted by the skilled person depending on the type of packaging used. For example, a sealed package in the form of a pot will preferably be closed by screwing while a sealed package in the form of a bag will preferably be closed by heat sealing or cold sealing.

The package, particularly the sealed package according to the present invention may comprise one or more tablets (s) wrapped (s) unitarily in a polymeric film. The sealed package can be a unit package (Figure 2A) or not (Figure 2B). Those skilled in the art will easily adapt the size of the package according to the number of tablets that it can understand.

Chlorinated tablet

In the context of the present invention, the term "tablet" or "chlorinated tablet" is intended to mean a composition consisting of a set of particles compactly grouped in such a way as to be able to be handled without disintegrating. Said compact composition comprises from 5% to 100% of a chlorine-releasing agent, preferably from 5% to 99.9%, relative to the total weight of the composition.

For the purposes of the present invention, the term "chlorine-releasing agent" or "chlorine-containing agent" means a compound that makes it possible to release chlorine in a solution, in particular an aqueous solution. Advantageously, the agent releasing chlorine is chosen from alkali metal hypochlorites, chlorinated trisodium phosphates, chlorinated sulphonamides, halogenated hydantoins, polychlorocyanurates such as alkali metal polychlorocyanurates and especially dichloroisocyanurates such as sodium dichloroisocyanurates or sodium dichloroisocyanurates. potassium, and mixtures thereof. More preferably, the chlorinated agent is chosen from dichloroisocyanurates. The chlorinated agent is more particularly chosen from sodium dichloroisocyanurate, potassium dichloroisocyanurate, or a mixture thereof, preferably sodium dichloroisocyanurate. Sodium dichloroisocyanurate (or DCCNa) is a stable source of free chlorine which, in an aqueous solution, is decomposed into isocyanuric acid, hypochlorous acid (weak acid of chemical formula HOCl which exists only in solution) which is a disinfectant agent, sodium hypochlorite (NaCIO), and sodium cyanurate, which acts as a stabilizer protecting the hypochlorous acid HCIO and the hypochlorite ion CLO- from ultraviolet decomposition.

The dichloroisocyanurates of sodium and potassium may be anhydrous, hydrated or dihydrated, preferably dihydrated.

The dichloroisocyanurates of sodium and potassium may be in amorphous or crystalline form.

Advantageously, the active chlorine-releasing agent is present in the tablet of the invention at a content ranging from 5% to 99.9%, more preferably from 7.5% to 99.9%, preferably from 20% to 99.9%, preferably from 40% to 99.9%, preferably from 50% to 99.9%, in particular from 50% to 90% and even more preferably from 60% to 85% by weight relative to the total weight. of the product.

The tablet according to the invention further comprises an effervescent filler and / or agent (or couple of agents).

Thus, the tablet according to the invention may comprise at least one load. Advantageously, the filler content in the tablet is between 0 and 95%, more preferably from 0.1 to 95% by weight, preferably from 0.1 to 90% by weight, more preferably from 0.1% to 80% by weight. %, preferably from 0.1% to 60%, preferably from 0.5% to 50%, preferably from 10% to 50%, more preferably from 15% to 40% by weight, based on the total weight of the composition.

Suitable fillers for the tablet according to the invention include inorganic compounds such as zeolites, phyllosilicates, alkali metal carbonates (for example sodium carbonate), sodium silicates, sodium bicarbonate, sodium chloride, weak acids (such as malic acid and adipic acid), charges at neutral pH (such as sodium sulfate); organic compounds such as polycarboxylate polymers (such as polyacrylates, acrylic / maleic copolymers and acrylic phosphonates), monomeric polycarboxylates (such as citrates, gluconates, oxydisuccinate, mono-, di- and tri-succinate) glycerol, carboxymethyloxysuccinates, amino polycarboxylic compounds, dipicolinates, nitrilotriacetates and hydroxyethyliminodiacetates); phosphates and polyphosphates; and their mixtures. Advantageously, the filler is chosen from sodium bicarbonate.

The tablet according to the invention may also comprise an effervescent agent. Preferably, the content of effervescent agent in the tablet is from 0.1 to 95% by weight, preferably from 0.1 to 90% by weight, more preferably from 0.1% to 80%, preferably from 0 to 80% by weight. From 1% to 60%, preferably from 0.5% to 50%, preferably from 10% to 50%, more preferably from 15% to 40% by weight, based on the total weight of the composition.

For the purposes of the present invention, the term "effervescent agent" means a compound capable of releasing gas when it is brought into contact with water or another liquid. The effervescent agent more particularly allows the tablet to fragment and / or dissolve rapidly in water or other liquid, especially in an aqueous solution. The effervescent agent may in particular be chosen from organic acids, their anhydrides or their salts (such as adipic acid, citric acid, malic acid, tartaric acid, malonic acid, fumaric, maleic acid, succinic acid and mixtures thereof), carbonates or bicarbonates (such as sodium carbonate or bicarbonate, potassium carbonate or bicarbonate, carbonate or calcium bicarbonate, magnesium carbonate or bicarbonate and their mixture ), and a mixture thereof. More preferably, the effervescent agent is a mixture of sodium bicarbonate and an organic acid, especially adipic acid or citric acid. Preferably, the effervescent agent is a sodium bicarbonate / adipic acid pair.

According to one embodiment of the invention, the tablet comprises an effervescent agent and a filler. Advantageously, the total content of filler and effervescent agent in the tablet is then between 0.1 and 95% by weight, preferably from 0.1 to 90% by weight, more preferably from 0.1% to 80% by weight. preferably from 0.1% to 60%, preferably from 0.5% to 50%, preferably from 10% to 50%, more preferably from 15% to 40% by weight, relative to the total weight of the composition.

The tablet according to the invention may further comprise a disintegrating agent. Advantageously, the disintegrating agent is present in the composition at a content of between 0 and 40% by weight, preferably 0% and 10% by weight, relative to the total weight of the composition.

For the purposes of the present invention, the term "disintegrating agent or disintegrating agent" means a solid compound soluble in an aqueous solution and dissolving. rapidly in aqueous solution, which improves the permeability of a solid composition when it is brought into contact with an aqueous solution. The disintegrating agent may in particular be chosen from polyacrylate derivatives, polyvinylpyrrolidones, cellulose derivatives and mixtures thereof.

The tablet according to the invention may furthermore comprise additional compounds such as binding agents, antilime agents, anionic surfactants, cationic surfactants, nonionic surfactants, optical brighteners, complexing systems, dispersants, enzymes, dyes, perfumes and mixtures thereof.

All the compounds present in the tablet, that is to say present in the compacted composition, are preferably initially provided in powder form.

According to an advantageous embodiment of the invention, the tablet according to the invention comprises between 5 and 99.9% active chlorine releasing agent and between 0.1 and 95% filler, preferably between 60 and 85% active chlorine releasing agent and between 15 and 40% charge. The agent releasing active chlorine and the feed being as defined above.

According to an advantageous embodiment of the invention, the tablet according to the invention comprises between 5 and 99.9% of active chlorine-releasing agent and between 0.1 and 95% of effervescent agent, preferably between 60 and 85% agent releasing active chlorine and between 15 and 40% effervescent agent. The agent releasing active chlorine and the effervescent agent being as defined above.

According to another advantageous embodiment of the invention, the tablet according to the invention comprises between 5 and 99.9% of active chlorine releasing agent, between 0.1 and 95% of filler and effervescent agent (content total), preferably between 60 and 85% active chlorine releasing agent, between 15 and 40% filler and effervescent agent (total content). The active chlorine releasing agent, the filler and the effervescent agent being as defined above.

The tablet according to the present invention has a mass of between 0.5 and 1000 grams, especially between 0.5 and 500 grams, preferably between 0.5 and 100 grams, and more preferably between 0.5 and 50 grams. This tablet may be round, oval, octagonal, parallelepipedal (square, rectangular ...), or polygonal. Preferably the tablet will be round. The tablet may have flat and curved, concave or convex upper and lower faces. The chlorinated tablet according to the invention may consist of a layer or a stack of several layers which are superimposed on each other, thus forming a uniform and compact block. The layers may be of similar or different compositions, or even similar or different colors.

The tablet has a mechanical strength of between 10 N and 5000 N, advantageously between 30 N and 3000 N, more preferably between 50 N and 1500N.

The chlorinated tablet according to the invention may in particular be manufactured according to the following preparation method:

a) mixing the various components in a homogeneous powder form, including at least one chlorine releasing agent, to form a composition;

b) Pre-compact the composition, in particular by direct compression, for example on rotary presses;

c) optionally, introducing on the first layer obtained in step b) a composition as obtained in step a) to form a second layer and then to pre-compact the new composition as performed in step b);

d) possibly repeat step c) as many times as necessary layers; and

e) compacting the layer obtained in step b) or all the layers obtained in step c) or d), in particular by direct compression, for example on rotary presses, to obtain a compacted composition.

The pre-compaction forces used are in particular between 5 kN and 200 kN, advantageously between 5 kN and 100 kN and more advantageously between 10 kN and 80 kN. The compaction force used is in particular between 20 kN and 1000 kN, advantageously between 40 kN and 600 kN and more advantageously between 60 kN and 250 kN.

The compacted composition thus obtained is resistant to shocks.

Polymeric film

For the purposes of the present invention, the term "polymeric film" is intended to mean a polymeric film, preferably flexible, intended to directly and unitarily wrap a tablet as defined above. In the context of the present invention, the polymeric film may be considered as the primary packaging of the tablet (1).

In the context of the present invention, the inventors have surprisingly discovered that, whatever the composition of the polymeric film, the latter allows to retain the chlorine gases, thereby avoiding swelling and / or deterioration of the secondary packaging, especially waterproof

The polymeric film comprises at least one polymer, advantageously chosen from polyvinyl alcohol (PVAL) polypropylene, bi-oriented polypropylene, metallized polypropylene, polyethylene, polyolefins, polyethylene terephthalate, polyvinyl chloride and a polymer of polyvinyl alcohol. biological origin based on corn starch or milk protein.

The polymeric film further comprises other agents such as plasticizers, additives, colorants, antistatic agents, or mixtures thereof.

In the context of the present invention, the polymeric film may be insoluble in water or water soluble.

In the context of a polymeric film that is insoluble in water, the polymer is advantageously chosen from polypropylene, bi-oriented polypropylene, metallized polypropylene, polyethylene, polyolefins, polyethylene terephthalate and polyvinyl chloride.

In the context of a water-soluble polymeric film, the polymer is advantageously chosen from polyvinyl alcohol (PVAL or PVOH) and a polymer of biological origin based on cornstarch or milk proteins. Preferably, the water-soluble film comprises polyvinyl alcohol (PVAL).

Preferably, the polymeric film is water soluble. When the tablet is wrapped in a water-soluble film, it is possible to obtain both a disintegration of the tablet and a good dissolution of the active chlorine-releasing agent (DCCNa) in the solution, and this for times of disintegration less than 5 minutes. Indeed, when a water-soluble film is used, the user does not need to remove the tablet from its water-soluble envelope; the water-soluble film will therefore play a role in the disintegration and dissolution of the tablet.

Advantageously, the polymeric film is water-soluble and biodegradable.

Advantageously, the polymeric film has a thickness of between 10 and 100 μm, preferably between 10 and 50 μm, and more preferably between 10 and 35 μm.

Advantageously, the polymeric film is closed around the tablet according to methods known to those skilled in the art such as heat sealing or cold sealing.

In the context of the invention, the tablet is packaged individually in the polymeric film. After closing, the polymeric film may be cut to form a tablet wrapped with the individual polymeric film, or the polymeric film may again be filled by a new tablet before being closed again. This last case represents a string of several tablets wrapped unitarily. When the desired number of tablets in the rosary is reached, the polymeric film is cut.

In the context of the present invention, the package and the polymeric film may be closed around the tablet separately. Thus, to access the tablet, two manipulations are necessary: the opening of the secondary packaging and the opening of the polymeric film (unless the latter is water-soluble and can be stored around the tablet during use) .

Process

The subject of the present invention is also a process for preparing a package (3) comprising at least one tablet (1) individually wrapped in a polymeric film (2), characterized in that the tablet comprises from 5% to 100%, preferably from 5% to 99.9% by weight of active chlorine releasing agent, said process comprising the following steps:

a) preparing the tablet (1) comprising from 5% to 100%, preferably from 5% to 99.9%, by weight of active chlorine releasing agent;

b) Incorporation of the tablet (1) obtained in step a) into the polymeric film

(2);

c) closing the polymeric film surrounding said tablet (1);

d) optionally, repeating steps a) to c) until the desired number of wrapped tablets are obtained;

e) cutting the polymeric film after step c) or step d);

f) Incorporation of the wrapped shelf (s) obtained in step e) in the package (3); and

g) Closing the package (3).

The package, the chlorinated tablet and the polymeric film are as defined above.

Step a) can be easily performed by those skilled in the art using his general knowledge. An example of preparation of the tablet is as described above.

Steps b) and f) can be performed easily by one skilled in the art using his general knowledge. Steps b) and f) can for example be carried out manually or industrially. The polymeric film is closed (step c)) around the tablet according to methods known to those skilled in the art such as heat sealing or cold sealing.

Advantageously, after the closing step c), either the polymeric film is cut in a step e) to form an individual wrapped tablet, or step d) is performed without cutting the polymeric film to obtain a string of several tablets wrapped unitarily then the polymeric film is cut in a step e) when the desired number of tablets in the rosary is reached.

The package is closed (step g)) according to methods known to those skilled in the art such as heat sealing or cold screwing and all other methods known to those skilled in the art. The method of closing the package can easily be adapted by those skilled in the art depending on the type of packaging used. For example, a sealed package in the form of a pot will preferably be closed by screwing while a sealed package in the form of a bag will preferably be closed by heat sealing or cold sealing.

use

The subject of the present invention is also the use of a polymeric film (2) for unitarily wrapping a tablet (1) intended to be placed in a package (3), characterized in that the tablet comprises from 5% to 100% preferably from 5% to 99.9% of chlorinated agent.

Description of the Figures

Figure 1 shows a tablet (1) wrapped unitarily in a polymeric film (2). the polymeric film (2) completely envelopes the tablet (1).

Figures 2A and 2B show a package, including a sealed package (3) comprising a shelf (1) wrapped unitarily in a polymeric film (2). The polymeric film (2) completely envelopes the tablet (1). Figure 2A shows a package, including a sealed package (3) unit and Figure 2B has a package, including a sealed package (3) may include several filmed tablets.

The following examples are intended to illustrate the present invention. Examples

Example 1 Comparison of the Disintegration Time and the Stability of Tablets Packaged According to the Invention with Tablets Not Filmed or Not in Sealed Packaging

In this example, we compared the time of disintegration and the stability of tablets based on DCCNa (sodium dichloroisocyanurate) strictly identical in composition, mass, form and in their method of implementation.

The tested tablets have a mass of 5 grams, cylindrical in diameter 20mm. The composition of these tablets is summarized in Table 1 below:

Table 1: Composition of the tablets tested

These tablets are produced on a rotary press with the same compressive force, ie 90 kN.

The tablets thus obtained are then individually wrapped in a polymeric film (flowpack) or not, as described in Table 2 below. The tablets are then placed in a secondary packaging, sealed or not, as described in Table 2 below.

Table 2: Description of the tests

The packages containing the tablets are then placed in a climatic chamber at 38 ° C. and 46% relative humidity. These conditions make it possible to accelerate aging: 1 week represents six months of stability at ambient temperature. The aging of these tablets has been monitored for one month in the climatic chamber, which corresponds to two years of stability at ambient temperature. Every week, the following measurements are made on the tablets:

- Aspect

Diameter hardness

- Disintegration time

- Measurement of active chlorine

Quantity of chlorinated gases released

- Measurement of the chlorine odor by a consumer panel The appearance of the tablets is evaluated by visual observation.

The diametrical hardness of the tablets is measured using a Dr Schleuniger 8M type durometer and is expressed in Newton (N).

The disintegration time of the tablets is measured statically in a beaker of one liter of water at 20 ° C. The concentration of active chlorine is measured by iodometric assay. The reagents used are: 0.024N sodium thiosulfate, 10% Kl solution, 4N sulfuric acid and 5g / L starch solution.

The quantity of chlorine gases released is measured using a GASTEC No. 8La measurement kit. It is a colorimetric test tube.

The measurement of the chlorine odor is evaluated immediately after the release of the packaging of the climatic chamber by a consumer panel of ten people. A notation is issued by each person: 10 strong smell, 5 weak smell, 0 no smell. An average score is obtained for each measurement.

The results obtained are summarized in Tables 3 to 5 below:

Table 3: Aspect Tracking, Hardness and Disintegration of Tablets

NF = non-flowpacked - ES = watertight bag-type packaging - EP = sealed pot-type packaging NE = unsealed packing

Table 4: Monitoring the amount of chlorinated gas released

Table 5: Chlorine odor monitoring by a consumer panel

The results of this study show that the use of a flowpack (tests 2 to 4) makes it possible to improve the stability of the tablets because the disintegration time does not increase or slightly and the active chlorine concentration remains stable unlike the tablets not filmed (test 1). In addition, the measurement of the released gases and the measurement of the chlorine odor by the consumer panel show that the flowpack makes it possible to retain the chlorinated gases released inside the flowpack. Example 2 Comparison of Disintegration Time and Stability of Shelves Packaged According to the Invention with Unscreened Tablets

In this example, we will compare the stability of tablets based on DCCNa strictly identical in composition, mass, form and in their implementation process.

The tested tablets have a mass of 5 grams, cylindrical in diameter 20mm. The composition of the tablets is quoted in the following table 6:

Table 6: Composition of the tablets tested

These tablets are all produced on a rotary press with the same compression force, namely 90 kN. Of all the tablets produced, thirty tablets are filmed with a polyethylene film of 30 μm thickness (5-PE test). These are then placed in a sealed package, dimensions 160x195mm, base Kraft (35μm) / PET (12μm) / PE (90μm). Thirty other non-filmed tablets (6-NF test) are placed in the same Kraft / PET / PE-based waterproof package. Each of the tablets of the same category are placed in the same bag.

These two packages containing the tablets are then placed in a climatic chamber at 38 ° C and 46% relative humidity. These conditions make it possible to accelerate aging: 1 week represents six months of stability at ambient temperature. The aging of these tablets has been monitored for one month in the climatic chamber, which corresponds to two years of stability at ambient temperature. Every week, the following measurements are made on the tablets:

- Aspect

Diameter hardness

- Disintegration time

- Measurement of active chlorine

Quantity of chlorinated gases released

- Measurement of chlorine odor by a consumer panel

The appearance of the tablets is evaluated by visual observation.

The diametrical hardness of the tablets is measured using a Dr Schleuniger 8M type durometer and is expressed in Newton (N). The disintegration time of the tablets is measured statically in a beaker of one liter of water at 20 ° C.

The concentration of active chlorine is measured by iodometric assay. The reagents used are: 0.024N sodium thiosulfate, 10% Kl solution, 4N sulfuric acid and 5g / L starch solution.

The results obtained are summarized in Tables 7 to 9 below:

Table 7: Appearance, hardness and disintegration of tablets

Table 8: Monitoring the amount of chlorinated gas released

Table 9: Chlorine odor monitoring by a consumer panel

The results of this study show that the use of a polyethylene (PE) flowpack of 30μm (5-PE test) improves shelf stability because the disintegration time increases slightly and the concentration of active chlorine increases. remains stable unlike non-filmed tablets (Trial 6-PE). In addition, the measurement of the released gases and the measurement of the chlorine odor by the consumer panel show that the flowpack makes it possible to retain the chlorinated gases released inside the flowpack.

Example 3 Comparison of the disintegration time of tablets packaged according to the invention with non-filmed tablets.

In this example, we compared the disintegration time of two strictly identical DCCNa-based tablets in composition, in mass, in shape and in their method of implementation.

The tested tablets have a mass of 5 grams, cylindrical in diameter 20mm. The composition of these two tablets is cited in Table 10 below:

Table 10: Composition of the tablets tested

Two tablets are produced on a rotary press, with the same compressive force. A tablet is filmed (7-PVOH test) in a 30μm polyvinyl alcohol water-soluble film (PVAL) using a laboratory flowpacker. The other tablet is not filmed (8-NF test). The disintegration time of the two tablets is measured statically in a beaker of one liter of water at 20 ° C. The results obtained are listed in Table 11 below. Table 1 1: Monitoring disintegration of tablets

When both tablets are immersed in the beaker of water, we observe the following points:

The tablet alone plunges directly into the bottom of the beaker

The filmed tablet floats on the surface of the water. The dissolution of the tablet begins when the water infiltrates inside the flowpack causing the pellet to burst. After one minute, the bottom of the flowpack is completely dissolved, releasing the entire tablet as a powder that falls as rain at the bottom of the beaker.

The results of this study show that the use of a water-soluble PVOH-based flowpack with tablets containing DCCNa provides a tablet with both good dissolution and rapid disintegration time. Since DCCNa granules are completely dissolved, the tablet is effective faster than the unpainted tablet. The solution prepared with the filmed tablet is ready for use.

Example 4: Comparison of the stability of the secondary packaging of tablets packaged according to the invention with non-filmed tablets and with tablets of dishwasher free chlorine filmed or not.

For this example, we have taken the known reference in the dishwasher market: SUN. The products consist of the following: a few tens of chlorine-free tablets are filmed in a water-soluble film (PVOH) and then introduced into a sealed polymeric plastic bag as a secondary packaging. The whole is then placed in a sealed carton box to get closer to the conditions of the marketed products.

Our interest lies in the use of the waterproof bag as a secondary packaging: does it inflate in the presence of high humidity or not? Can the type of packaging used by SUN for dishwasher tablets be duplicated for chlorine?

In this example, we have observed the appearance of the plastic know in different configurations:

- the bag contains 30 tablets of SUN dishwasher or 30 tablets of chlorine according to example 1 (DCCNa)

the tablets can be filmed individually in a polymeric film or not

- The knowledge is placed in an environment at ambient temperature (25 ° C and 37% relative humidity on average) and or in a climatic chamber (38 ° C and 46% humidity)

The results are summarized in Table 12 below. In this table, the following abbreviations are used:

LV = SUN dishwasher tablet;

CL = chlorinated tablet according to Example 1;

- AA = environment at room temperature (25 ° C and 37% relative humidity on average);

EC = climatic chamber (38 ° C and 46% humidity);

- X = no;

- f = yes; and

- T = time.

The results of this study show that the use of a polymeric film and moisture have no impact on the SUN dishwasher product as there is no degassing found, so no swelling of the s is observed.

On the other hand, for non-filmed chlorinated tablets, swelling of the secondary packaging is observed, whether in an environment at room temperature or a humid environment.

It has also been found that the use of chlorinated tablets filmed prevents this swelling. Indeed, the waterproof seal does not swell when the chlorinated tablet is filmed, that the knowledge is placed in an environment at room temperature or in a humid environment. In the context of the present invention, the humidity and the temperature therefore have no impact on the swelling of the secondary packaging, particularly the sealed secondary packaging.

We can therefore conclude that there is indeed an interaction between the chlorinated tablet and the secondary packaging and that this interaction does not result from the external environment. We can also conclude that the flowpack reduces the interaction between the chlorinated tablet and the air present in the know, avoiding any swelling of the secondary packaging used.

Table 12: Study of the swelling of the secondary packaging

Claims

1. Packaging (3) comprising at least one tablet (1) individually wrapped in a polymeric film (2), characterized in that the tablet comprises from 5% to 100% active chlorine releasing agent.

2. Packaging according to claim 1, characterized in that the tablet comprises from 5% to 99.9% active chlorine releasing agent.

3. Package according to claim 1, characterized in that the tablet comprises from 7.5% to 99.9%, advantageously from 20 to 99.9%, of active chlorine-releasing agent.

4. Package according to any one of claims 1 to 3, characterized in that said package is a bag.

5. Packaging according to any one of claims 1 to 4, characterized in that said package is a sealed package, preferably a waterproof bag.

6. Package according to any one of claims 1 to 5, characterized in that the agent releasing active chlorine is chosen from dichloroisocyanurates.

7. Packaging according to claim 6, characterized in that the active chlorine-releasing agent is sodium dichloroisocyanurate, potassium dichloroisocyanurate, or a mixture thereof.

8. Package according to any one of claims 1 to 7, characterized in that the polymeric film comprises a film-forming agent chosen from polyvinyl alcohol, a polymer of biological origin based on corn starch or milk proteins. polypropylene, bi-oriented polypropylene, metallized polypropylene, polyethylene, polyolefins, polyethylene terephthalate and polyvinyl chloride.

9. Package according to any one of claims 1 to 8, characterized in that the polymeric film has a thickness between 10 and 100 microns.

Process for preparing a package (3) comprising at least one tablet (1) individually wrapped in a polymeric film (2), characterized in that the tablet comprises from 5% to 100%, preferably from 5% to 99.9%, by weight of active chlorine releasing agent, said process comprising the following steps:

b) Incorporation of the tablet (1) obtained in step a) into the polymeric film

(2);

c) closing the polymeric film surrounding said tablet (1);

e) cutting the polymeric film after step c) or step d);

g) Closing the package (3).

11. Process according to claim 10, characterized in that the tablet comprises from 7.5% to 99.9%, advantageously from 20 to 99.9%, of active chlorine-releasing agent.

12. The method of claim 10 or 11, characterized in that said package is a bag, preferably a sealed bag.

13. Use of a polymeric film (2) for individually wrapping a tablet (1) intended to be placed in a package (3), characterized in that the tablet comprises from 5% to 100%, preferably from 5% to 99.9% by weight of active chlorine releasing agent.

14. The use as claimed in claim 13, characterized in that the tablet comprises from 7.5% to 99.9%, advantageously from 20 to 99.9%, of active chlorine-releasing agent.

15. Use according to claim 13 or 14, characterized in that said package is a bag, preferably a waterproof bag.

16. Use according to any one of claims 13 to 15, characterized in that the polymeric film comprises a film-forming agent chosen from polyvinyl alcohol, a polymer of biological origin based on corn starch or milk proteins. polypropylene, bi-oriented polypropylene, metallized polypropylene, polyethylene, polyolefins, polyethylene terephthalate and polyvinyl chloride.