CA1233004A - Polyvinyl chloride dispenser containing compatible disinfectant composition - Google Patents

Abstract

ABSTRACT OF THE DISCLOSURE

A toilet cleaning dispenser for releasing into the toilet bowl a disinfectant solution during the flush of said toilet, the article comprising a poly-vinylchloride disinfectant chamber, means for water to enter the disinfectant chamber, means for concentrated disinfectant solution to exit from the disinfectant chamber, and a disinfectant composition in solid form contained within said disinfectant chamber, the disin-fectant composition consisting essentially of from about 50 to about 90% trichloroisocyanuric acid and from about 10 to about 50% cyanuric acid.

Description

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FIELD OF INVENTION

The present invention relates to disinfectant compositions that are compatible with polyvinyl-chloride, to a polyvinyl chloride article for dopiness-in said compositions, and to a method of disinfecting with said compositions. More specifically, the pro-sent invention concerns a disinfectant composition that is a mixture of trichloroi60cyanuric acid and cyan uric acid, which composition is the less prone to attack containers fabricated from rigid polyvinyl-chloride. Most specifically, the compositions herein disclosed comprise from about 50 parts trichloroiso-cyan uric acid to about 90 parts ~richloroisocyanuric acid and from about 10 parts cyan uric acid to about 50 parts cyan uric acid.

BACKGROUND OF INVENTION

Polyvinyl chloride (PVC) is a resin based on the vinyl radical (CH2-CH~) or the vinylidene radical (SCHICK). PVC has applications for piping systems, which accounts for 40% of the PVC market, as a build-in construction material, as flooring, and in wall coverings. Meat wrap enclosures axe prominent in food packaging, with bottles and blister packs occupying a prominent place in non-food uses. Cohen, "Polyvinyl and Vinyl Copolymers", Modern Plastics Encyclopedia, pages 100-108 ~1981-82) states that PVC's are comma-gaily inert, water, corrosion, and weather resistant;
have a high strength-to-weight ratio; are tough, dent-re~istant; are electrical and thermal insulators, ~:33~

and maintain their properties over long periods of time. As stated in the Cohen article, several types of PVC exist: homopolymers, which have a chlorine content of about 56.8% by weight, chlorinated PVC, which has a chlorine content of about 67% by weight, and copolymers, particularly vinyl acetate copolymers. The hither molecular weight homopolymers have greater strength, chemical and heat resistance, but are difficult to process, while the lower mole-cuter weight resins are more easily manufactured but with some sacrifice in properties. The chlorinated PVC's have good heat deflection temperature and there-fore have utility in residential hat water systems.
The copolymers provide easier flow at processing temperatures, better pigment binding, a broader them-portray range for vacuum forming, and greater volubility.

Penn, PVC Technology (Third Edition 1970 ) India gates at page 6 that pure, unplasticized, PVC it resistant to most acids and alkalis, although it is decomposed by concentrated sulfuric, nitric and chronic acids.

Toe term "rigid PVC" is used interchangeably with the term "unplasticized PVC" ~UPVC) to described a PVC
resin containing little or no plasticizer, but include in stabilizer, and in most instances lubricants and other additives. The major applications for rigid PVC
are pipe and sheet High impact rigid PVC is made by incorporating a copolymer or by use of a modifier such as a synthetic rubber or an acrylic in a conventional polymer.

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The chemical properties of rigid PVC have been reported in the Penn reference at pages 380-383. Thus it is seen that rigid PVC it satisfactory in hype-shellers acid at temperatures of 20 and 60C.

Compositions containing trichloroisocyanuric acid and cyan uric acid are known. Thus, U.S. Patent

2,988,471 to Fuchs et at. discloses a disinfectant composition for use in the treatment of swimming pools, the composition comprising a disinfectant material which provides available chlorine, for example, sodium dichlorocyanurate, dummy hypochlorite and calcium hypochlorite, and cyan uric acid to reduce loss of active chlorine in aqueous systems exposed to sunlight. Consideration of compatibility with polyp vinyl chloride is not considered in the Fuchs patent.

U.S. Patent 3,278,443 to Bright et at. discloses bleaching compositions based on chlorinated cyan uric acid, which compositions contain a stabilizer material which is an ethylenically unsaturated material of the general formula R-CH=CH-X where R is selected from the group consisting of phenol, ethoxyphenyl, ethylene dioxybenzyl and like moieties, and X is selected from the group consisting of hydrogen, phenol, ethylene, methyl, hydroxymethyl and like moieties. Cyan uric acid is not disclosed in the Bright patent U.S. Patent 3,413,078 to Lucite et at. discloses a method of bleaching synthetic fibers wherein a chlorinating agent consists of at least one N-chloxi-noted derivative of cyan uric acid in admixture with 33~
cyan uric acid, or at least one alkali metal hype-chlorite or alkaline earth metal hypochlorite in admixture with cyan uric acid. The synthetic fibers that may be bleached according to the method of the Lucite patent include polyvinyl chloride fibers.

A bleaching process is described in U.S. Patent

3,586,474 to Kowalski. In that process the generation of nitrogen trichloride vapor is inhibited by a con-elusion of from 0.01 to 0.5% by weight of the bleach bath of a turret of a saturated fatty acid, thereby preventing corrosion problems and eliminating expel-soon hazards. Light stabilized chlorine compositions are disclosed in U.S. Patent 3,253,979 to Rob son. In the Rob son compositions, which are suitable for treat-mint of public swimming pools, cyan uric acid is used as a stabilizer to avoid against loss of available chlorine due to sunlight. The cyan uric acid reacts with free available chlorine to form N-chloroiso-cyan uric acid or its salts, the N-chloroisocyanurates, which N-chloro compounds do not absorb in the ultra-violet region of sunlight and thus are not decomposed.

U.S. Patent 3,178,372 to Pomot et at, discloses stabilized trichlorocyanuric acid compositions, where-in one mole of tri-alkali metal sonority is incur-prorated for every two moles of trichlorocyanuric acid.

A packaged dry bleach and disinfectant compost-lion is disclosed in U.S. Patent 3,061,549 to Dickeys The bleach incorporated is dichlorocyanuric acid or a trichlorocyanuric acid, as sources of available chlorine upon dissolution of acid in water. As ~2~3~
indicated in the '549 patent at column 1, lines 16-22, the effects of volatile compounds resulting from partial decomposition of the dichlorocyanuric acid or trichlorocyanuric acid may be destructive to a great variety of common packaging material. The dry bleach materials of the '549 patent are stabilized by mix-lures of manganese dioxide and cupric oxide (hopcho-file), activated alumina, activated carbon zealots, fuller earth, bentoni~e, activated montmorillonite, silver phosphate, silver nitrate, mercuric nitrate, alkali metal silicates, alkali metal hydroxides, carbonates of potassium, rubidium, or sesame, and alkaline earth oxides. The dry bleach package of Dickeys comprises a glass or paper board container having top and bottom closures, and which may be adapted for opening in any suitable manner or by any suitable means to dispense the bleach composition.
The stabilizing mixture is provided in a separate porous fabric bag which is proximate to the container for the bleach materials, but remains unmixed there-with. According to Example I, the adsorbent was contained within a small perforated bag of polyethy-tone plastic, the edges of which were heat sealed/ and suspended in the container for the dry bleach.

Stabilized trichlorocyanuric acid compositions are also disclosed in U.S. Patent 3,108,078 to Nixon, these compositions containing as the stabilizing agent an olefin having a double bond containing a tertiary carbon atom. Examples of the stabilizers of the Nixon patent are diisobutylene, tetraisobutylene, propylene-tetramer, and the like. U.S. Patent 4,289,815 to Lee discloses a sealed pouch for controlled release of ~L23;l~10~
chlorinating agent, including trichlorocyanuric acid and dichloroisocyanuric, wherein the pouch it polyp vinyl alcohol in film form, the polyvinyl alcohol being at least 99% hydrolyzed and having a minimum degree of swelling in water of about 120~. At column 5, lines 23-28, it is said that the polyvinyl alcohol pouch may be contained within another moisture carrier bag made from polyethylene, polystyrene or polyvinyl-chloride. The compositions contained within the sealed pouch of the Lee patent are in dry form.
Cyan uric acid is not contained within the pouch of the Lee patent.

U.S. Patent 4,389,325 to Erg et at, discloses the use of porous crystalline alumino-silicate to provide a stabilized chloroisocyanuric composition. Also of interest is U.S. Patent 4,389,318 to Wojtowicz wherein stabilization of the trichloroisocyanuric acid is accomplished by including an alkali metal bicarbonate, the molar ratio of the alkali metal bicarbonate to the trichloroisocyanuric acid being from about 3:1 to about 1:1. The moisture content of the dry compost-lion it less Han about 0.2% by weight of the mixture.

It has been found that dispensers, especially toilet cleaner dispenser articles, containing an aqueous solution of trichloroisocyanuric acid (up to the volubility limit thereof), which dispensers are fabricated from rigid polyvinyl chloride, especially high impact polyvinyl chloride, tend over time to be discolored and to be deformed. It has alto been found that such discoloration and deformation is essentially avoided by inclusion of cyan uric acid.

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SUMMARY OF INVENTION

It it an object of the present invention to provide a dispenser manufactured of rigid polyvinyl-chloride, especially high impact polyvinyl chloride, for dispensing a disinfectant which it a dichloroiso-cyan uric or trichloroisocyanuric acid.

A primary object of the present invention is to provide a dispenser fabricated from polyvinyl chloride containing as the disinfectant material a tablet, cake, or other solid composition consisting essential-lye of a disinfectant agent selected from the group consisting of alkali and alkaline earth metal dichlorocyanurates and trichloroi60cyanuric acid, and cyan uric acid, which composition in aqueous solution forms within the dispenser a concentrated solution of the disinfectant tablet materials, the polyvinyl-chloride dispenser resisting discoloration and deformation in such environment.

These and other objects of the present invention will be more readily understood upon a reading of the specif1catlon, a summary of which it provided below.

The dispenser of the present invention comprises one or more product chambers for containing a disinfectant tablet in tablet form, said at sinfectant tablet consisting essentially of 50 to 90~ by weight of a disinfectant agent selected from the group con-sitting of alkali metal and alkaline earth metal dichloroisocyanurates and trichloroisocyanuric acid, and from about 10 to about 50~ cyan uric acid; liquid ~33~

inlet means disinfectant solution outlet means, which means may be the same as the liquid inlet means; and vent means, at least the product chamber of said disk penner being fabricated from rigid polyvinyl chloride.

The subject invention also concerns a method of disinfecting a reservoir such as a toilet bowl. The method comprises in one aspect the steps of forming a concentrated disinfectant solution within a product chamber of a rigid polyvinyl chloride dispenser, said concentrated disinfectant solution consisting Essex-tidally of the dissociation products of an alkali metal or earth metal salt of dichlorocyanurate and tracheal-roisocyanuric acid, and cyan uric acid, the concentration of said dissociation products therein being up to the volubility limits thereof, and dispensing said con-cent rated solution into a toilet bowl, the concentra-lion of the disinfectant being from about two to about 15 ppm in the bowl water after the flush.

In another embodiment the present invention pro-vises a reservoir cleaning dispenser for releasing into the reservoir a disinfectant solution, the dispenser comprising a polyvinyl chloride disinfectant chamber, means for concentrated disinfectant solution to exit from the disinfectant chamber, and a disinfectant composition in solid form contained within said disinfectant chamber, the disinfectant composition consisting Essex-tidally of from about 50 to about 90% trichloroisocyanuric acid and from about 10 to about 50~ cyan uric acid.

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BRIEF DESCRIPTION OF THE DRAWINGS
,, ,, . _ Figure 1 is a perspective view of a first embody-mint of the dispenser of the present invention.

Figure 2 is a perspective view of a second embody-mint of the dispenser of the present invention.

Figure 3 is a cross-sectional side elevation Al view through lines 3-3 of Figure 2.

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Figure 4 it a perspective view of a dual chamber dispenser for separately dispensing a forfeit cleaning ablution and a second cleaning solution, which it the disinfectant 601ution.

DESCRIPTION OF THE PREFERRED EMBODIMENT

he dispenser of the present invention is adapted for placement within the tank of a flush toilet disk penner containing within a product chamber a disinfect lent tablet, cake, or other solid material, which dispenser, particularly the product chamber, is fabricated from rigid polyvinyl chloride. The disk penner is adapted to release a concentrated disinfect lent solution each the toilet is flushed, the solution contained within the product chamber being dispensed by gravity and/or siphonic flow. After a flush, as the level of the tank water rises, water repenters the product chamber of the dispenser, thereby reforming the concentrated solution of disinfectant material.
Initially, of course, the disinfectant material it in dry form as noted above. However, after flushing several times, the tablet or other form of the Metro-at readily forms the concentrated solution of Dyson-extant material upon refilling of the toilet tank, i.e., each time the product chamber is refilled.

The dispenser preferably comprises a product chamber containing said disinfectant material, inlet means for allowing tank water to enter the product chamber, discharge means for allowing concentrated solution to be dispensed from the product chamber in ~L~33~
response to a flush of the toilet, and vent ennui to permit air and evolving vases from the immersed Dyson-fectant composition to escape during the filling of the product chamber with tank water. The inlet mean and the outlet means may be the same.

Most preferably, the inlet and outlet means are combined, said combined inlet/di~char~e means being in the form of a siphon conduit. The siphon conduit pro-fireball enters the product chamber at a point such that the product chamber it divided into an upper portion and a lower portion, solution contained in said upper portion being dispensed upon the occasion of a flush, while solution contained in said lower portion being retained to provide a weak solution of disinfectant immediately following refilling. The vent conduit preferably extends from proximate the top of the upper portion of the product chamber.

Referring to Figure 1, the dispenser 10 of the present invention comprises a product chamber 11 have ivy the lower portion 12 for containing a disinfectant composition herein after described and an upper portion 14, the volume of which it essentially equal to the volume of solution discharged from the do pouncer a refill/di~charge pathway 30 which is an inverted Conduit and a vent 40, which it shown to extend from the top of the product chamber 11. Preferably, the dispensing article herein is fabricated by thermoforming a first thermoplastic resin substrate 22 to provide the product chamber, refill/discharge pathway, and vent, respectively, filling the product chamber with the disinfectant composition, and kiwi securing to the back of the substrate 22 a backing substrate 22'. Other suitable method of fabrication can be used, for example, injection molding.

Common to the upper and lower portions of the product chamber 11 is front wall 15, the back wall which is the backing substrate 22', and side wall 17.
The lower portion 12 of the product chamber 11 further comprises bottom wall 21, side wall 16, and top wall segment 18, while the upper portion 14 of the product chamber 11 further compare en top wall 20 and wide wall 19. The refill/discharge conduit 30 comprises a long leg 31 and a short leg 32, the legs 31 and 32 being arcuately joined at their uppermost portions, said arcuate portion being designated by numeral 29, the short leg 32 being in fluid communication with the lower portion 12 of the product chamber 11 at the top wall segment 18, which wall segment 18 is hereinafter referred to as the shoulder 18. Preferably, the uppermost portion 39 of the refillldischarge pathway 30 is at a level that is at or is slightly below that of the top wall 20 of the upper portion 14 of the product chamber 11.

Preferably the long leg 31 of the refolds-charge pathway 30 comprises an end portion 33 having an orifice 36 proximate the bottom thereof, a middle portion 34 of larger horizontal cross-sectional area than said end portion 33, and a top portion 35 of progressively smaller cross-sectional aria than that of the middle portion 34. The cross-sectiona]. area of the short icy 32 is essentially constant through its height, and is smaller than that of the top portion 35 I
of the long leg 31. The uppermost portion 39, which is in transition between said top portion 39 of leg 31 and leg 32, has a decreasing cro6s-~ectional area normal to the flow path of fluid. The product chamber it vented by mean of conduit 40 extending from the lap wall 20 of the upper chamber to the periphery of the elastic substrate 22. Preferably, induce 41 it provided to advise the consumer of the proper placement of the dispenser 10 in the toilet tank, which is above top wall 20 of the product chamber 11.

The disinfectant composition 25 it provided in the lower portion I of product chamber 11 and may be in tablet, extradite, pouch, agglomerate, briquette, or cake farm.

Referring to Figure 2, the dispenser 110 come proses a product chamber 111 having a lower portion of 112 and an upper portion 114; a refill/discharye pathway 130, and a vent 140. The lower portion 112 has front wall aye, side walls 116 and await bottom wall 121, and top wall segment aye. The upper champ bier 114 has a front wall 115b, side walls 117b and 119, top wall 120, and bottom wall segment 118b. The back wall which it the planar backing subfitrate 123 it common to both upper and lower portions ox the product chamber 111. As shown in Figure 2, the disinfectant composition is provided in the lower portion 112 of product chamber 111, although this is not essential.

As ought clearly shown in Figure 3, a cr~s-sec-tonal view of the product chamber across lined 3-3 of Figure 2, the top wall segment aye and bottom wall ~33~4 segment 118b extend only partially into the depth of the product chamber normal to the backing substrate, thus providing an elongate path or channel 156 for fluid communication between the lower portion 112 and upper portion 114 of the product chamber 111. The top wall segment aye of the lower chamber 112 provides a baffle preventing the substantial bypassing of gas evolved from the disinfectant tablet from the lower chamber 112 to the upper chamber 114.

The cross-sectional area of the baffle aye may be adjusted. However, decrease in the cross-sectional area of the baffle aye preferably is obtained by reducing the longitudinal dimension of the baffle, rather than the transverse dimension of the baffle.
In the dispenser shown in Figure 2, the baffle may be a wall segment common to both the lower portion 112 and the upper portion 114. However, the particular construction shown in Figure 2 wherein the baffle aye and wall segment 118b are separate and join proximate the backing substrate is more suitable for fabrication by thermoforming.

The refill/discharge pathway 130 shown in Figure 2 it the same as that shown in Figure 1 for dispenser 10. Similarly, the vent conduit 140 is the same as that shown in Figure 1 for dispenser 10. Figure 4 illustrates a dispenser 200 adapted for releasing into the tank water simultaneously from Separate product chambers aye and 211b a first cleaning solution and a second cleaning solution, said first cleaning solution being a detergent solution and the second cleaning solution being the disinfectant solution. Product I

shimmer aye containing the detergent composition, it the same as shown in Figure 1, while product chamber 211b is the tame as that shown in figure 2.

Typically, the dispenser of the prevent invention release active disinfectant solution for a period of from about 20 to about 40 days, depending on the level of use thereof. On average, the dispenser releases the disinfectant solution or a period of 30 days, based upon an average of from about 8 to 12 flushes per day. Thus, the volume ox the product chamber is preferably from about 65 to about 85 ml, the upper portion of the product chamber being from about 45 to about 75 ml, the solution released by the dispenser being contained in said upper portion. The disinfect lent material weighs typically between about 25 to about 45 grams active disinfectant material, and is preferably in tablet or extradite Norm. The tablet is about 1-1/2 inches diameter by about 1/2 inch in thickness.

A typical dispenser as shown in Figure 2 has a lower chamber that it about 2-1/2 inches high by 2-11/16 inches wide by about 1 inch deep, and an upper chamber that it about 7, inches high by about 2-1/8 inches wide by about 1 inch deep. The elongate pathway between the upper chamber and the lower chamber it about 3/16 inch in width, measured normal to the backing substrate.

The shoulder 18 of the dispenser illustrated in Figure 1 for the top wall segment 118 of the dispenser illustrated in Figure 2 Jay be slightly raised in the 1~30Q~

direction of the refill/discharge pathway, thereby assuring that toe evolved gases are collected in the refill/discharge pathway. Similarly, the top wall 20 or 120 of the upper chamber may be directed it'll upwardly towards the vent conduit 40 or 140, respect lively, thereby directing evolved gases out of the product chamber.

The disinfectant material contained within the dispenser of the present invention it, prior to use within the toilet, in dry form, which may be portico-late, cake, agglomerate, extradite, or other form.
Preferably, the material is in the form of a tablet or extradite. The do infect ant composition comprises from about 50 to 90 parts of a disinfectant agent selected from the group consisting of alkali metal or alkaline earth metal dichlorocyanurates, for example, sodium dichlorocyanurate, potassium dichlorocyanurate, and calcium dichlorocyanurate, and trichloroiso-cyan uric acid, and from about 10 to about 50 parts cyan uric acid. The disinfectant material may Allah contain minor amounts of monochlorocyanurates. In solution, a portion of the active disinfectant species and the cyan uric acid will form ~onochlorocyanurates, which reaction is depending upon pi of the solution.

It ha been found that a polyvinyl chloride disk penner containing only trichloroisocyanuric is disk colored an is deformed during quiescence periods, that it, during period between flushes. By including between 10 to 50 parts cyan uric acid, preferably between 15 to 35 parts cyan uric acid in the disinfect lent composition, it has been found that discoloration 3 ~330~L
and deformation of the polyvinyl chloride dispenser it largely avoided.

Polyvinyl chloride suitable for the manufacture of dispensers of the present invention are rigid polyp vinyl chlorides, that is, polyvinyl chlorides having lets than about I plasticizer. Such polyvinyl-chloride it available as extruded sheet, and has tensile modulus of from about 350 to about 600 psi x 10 ; tensile strength of from about 6000 to about 7500 psi and Issued impact strength of 1/8 inch piece of from 0.4 to about 20 it lbs/in notch gate. Preferred PVC for use in the fabrication of the subject disk penner are the extruded high-impact PVC, that is, those having an Xzod impact of from about 5 to 15 it lbs/in notch gate was measured with ASTM D~56), which PVC material it available as Carom 49 manufactured by Goes Corporation and Genotherm~ 1008 manufactured by American Hoechst Corporation.

Example 1 Tablets containing essentially 100% trichloroiso-cyan uric acid and 0% cyan uric acid were placed in two beakers containing 72 miss of water at room temperature. The bottom portion of two dispenser of the type shown in Figure 2 were suspended within the trichloroisocyanuric acid solutions, as well as a 0.020 inch strip of unthermoformed polyvinyl chloride (Blue C, American Hoechst). The samples were observed in the solution over a 28-day period. During the cur e of the experiment, water was added to replace that 108s by evaporation. All test samples showed l~VV

discoloration and deformation, with the clear plastic bottom portion of the dispenser showing the greatest amount of attack by the concentrated by trichloroiso-cyan uric solution.

Example 2 Further texts were conducted on a whole dispenser unit of the type shown in Figure 4, the dispenser con-twining a 28 gram tablet of 100~ trichloroisocyanuric acid. The dispenser used in this text alto had a second product chamber adapted to contain a surfactant composition. However, the samples tested did not con-lain a surfactant. The dispenser was sealed in Mobil OPUS polypropylene over wrap. The dispenser was manufactured from American Hoechst D'8A:PCN128 polyp vinyl chloride.

Each of the 6 sample dispensers were placed on test at 120~F, 95/85% relative humidity for 28 days and 3 dispensers and subjected to three freeze-thaw suckle No sign of discoloration in any form was noted.
Subject ampule (6 at 120F, 95/85% relative humidity and 3 at froth) had an average weight increase of about Al at each test condition. All 95~85%
relative humidity samples were cut open and inspect-Ed No product attack was observed.

12 sample dispensers were placed in toilet tanks, 6 at the water line and 6 completed submerged. In addition, three samples were completely submerged in a ~33~

4 liter beaker of water end 3 sample alto containing a surfactant tablet in the detergent chamber were come pletely submerged.

Samples tested in the toilet showed a white disk coloration around the bottom of the disinfectant tablet compartment as well as plastic deformation.
Reformation was also seen on the ridding backing of the disinfectant chamber. Attack way more severe in the completely submerged samples than in the samples placed at the water line. All samples were examined and no indication of plastic 60ftening was evident.
The beaker samples tested all showed discoloration and plastic deformation in chambers containing the in-chloroisocyanuric acid tablet. In addition, ridding deformation was more severe in all beaker samples.

Example 3 - Dispensers of the type shown in Figure 4 Jon-twining a blended disinfectant tablet compri~iny a mixture of 75% trichloroi~ocyanuric acid and 25~
cyan uric acid were tested. These dispensers also contained a detergent block composition in a second product chamber. Six samples were placed on tests at 120F and 95F/85~ relative humidity for 28 days and 3 units were subjected to 3 freeze/thaw cycles. Half the high temperature samples were stored siphon tubes up; half stored siphon tubes down. No sign of disk coloration in any form was noted. Weight loss average for the 120F samples was 0.25% and fox the 95F/85~
relative humidity samples 0.40~ weight gamin way not-Ed The fiamples tested for freeze-thaw showed a 0.03%

~33~)4 weight increase. Upon completion of the test, all 120F and 95DF/85~ relative humidity samples were cut open. No discoloration or deformation way observed in either the disinfectant or the ~urfactant chamber.

12 sample dispensers were placed in toilet tanks for 28 days at room temperature, half of the samples being at the water line and half the samples being completely submerged. Of the water line samples, all showed slight discoloration and deformation only on the bottoms and corners of the disinfectant chamber.
One sample showed slight discoloration and deformation on the ridding backing of the disinfectant comport-mint. A granular deposit was noted at the top of the vent port of the disinfectant compartment on all samples placed at the water line. All completely submerged samples showed slight discoloration and deformation only on the bottoms and corners of the disinfectant compartment. One sample showed slight discoloration and deformation on the ridding in the form of one spot. No granular deposit was seen on the submerged samples tested.

It was concluded that the tablet containing trichloroi~ocyanuric acid and cyan uric acid notably minimized the plastic discoloration and deformation noted in previous test of Examples 1 and 2. The granular deposit was analyzed as 95% cyan uric acid and forms when the unit undergoes static periods of at least several days. The formation of the deposit may be prevented by submerging the vent.

Claims (21)

I Claim:

1. A toilet cleaning dispenser for releasing into the toilet bowl a disinfectant solution during the flush of said toilet, the article comprising a polyvinylchloride disinfectant chamber, means for water to enter the disinfectant chamber, means fox concentrated disinfectant solution to exit from the disinfectant chamber, and a disinfectant composition in solid form contained within said disinfectant chamber, the disinfectant composition consisting essentially of from about 50 to about 90% trichloroi-socyanuric acid and from about 10 to about 50%
cyanuric acid.

2. The toilet cleaning article of claim 1 wherein the polyvinylchoride is substantially un-plasticized.

3. The toilet cleaning article of claim 2 wherein the article is adapted for placement in a tank of the toilet.

4. The toilet cleaning article of claim 4 wherein the means for water to enter is the same as the means for solution to leave the disinfectant com-partment.

5. The toilet cleaning article of claim 4 wherein the combined inlet/outlet means is a siphon conduit entering the disinfectant chamber a to pro-vide an upper portion and a lower portion, the disin-fectant solution being contained within the upper portion.

6. The toilet cleaning article of claim 5 further comprising means to vent air and evolve gases from the disinfectant compartment.

7. The toilet cleaning article of claim 6 wherein the polyvinylchloride is characterized by a tensile modules of from about 350 to about 600 psi X
105; a tensile strength of from about 6000 to 7500 psi, and an Izod Impact strength of from about 0.4 to 20 ft lbs/ in notch gate.

8. The toilet cleaning article of claim 7 wherein the trichloroisocyanuric acid in an amount of from about 65 to 85% by weight of the solid material.

9. The toilet cleaning article of Claim 8 wherein the Izod Impact strength is from about 5 to about 15 ft lbs/ in notch gate.

10. The toilet cleaning article of claim 8 wherein the vent means is a conduit extending from the top of the disinfectant compartment.

11. The toilet cleaning article of claim 9 further comprising a second compartment.

12. The toilet cleaning article of claim 10 wherein the second compartment contains a surfactant composition in solid form.

13. A reservoir cleaning dispenser for releasing into the reservoir a disinfectant solution, the dispenser comprising a polyvinylchloride disinfectant chamber, means for water to enter the disinfectant chamber, means for concentrated disinfectant solution to exit from the disin-fectant chamber, and a disinfectant composition in solid form contained within said disinfectant chamber, the disinfectant composition consisting essentially of from about 50 to about 90% trichloroisocyanuric acid and from about 10 to about 50% cyanuric acid.

14. The reservoir cleaning article of claim 12 wherein the polyvinylchloride is substantially unplasticized.

15. The reservoir cleaning dispenser of claim 14 wherein the means for water to enter is the same as the means for solution to leave the disinfectant compartment.

16. The reservoir cleaning article of claim 15 wherein the combined inlet/outlet means is a siphon conduit entering the disinfectant chamber as to provide an upper portion and a lower portion, the disinfectant solution being contained within the upper portion.

17. The reservoir cleaning article as in claim 16 further comprising means to vent air and evolve gases from the disinfectant compartment.

18. The reservoir cleaning article of claim 17 wherein the polyvinylchloride is characterized by a tensile modules of from about 350 to about 600 psi X 105; a tensile strength of from about 6000 to 7500 psi, and an Izod Impact strength of from about 0.4 to 20 ft lbs/ in notch gate.

19. The reservoir cleaning article of claim 18 wherein the trichloroisocyanuric acid in an amount of from about 65 to 85% by weight of the solid material.

20. The reservoir cleaning article of claim 19 wherein the Izod Impact strength is from about 5 to about 15 ft lbs/ in notch gate.

21. The reservoir cleaning article of claim 19 wherein the vent means is a conduit extending from the top of the disinfectant compartment.