NZ229984A

NZ229984A - Method for deodorising toilet holding tanks: polyamine compositions for use therein

Info

Publication number: NZ229984A
Application number: NZ22998489A
Authority: NZ
Inventors: Mary R Burrows
Original assignee: Thetford Corp
Priority date: 1988-07-19
Filing date: 1989-07-18
Publication date: 1991-12-23
Also published as: ES2018377A6; EP0378680A4; EP0378680A1; AU4044089A; WO1990000906A1; AU623169B2

Description

New Zealand Paient Spedficaiion for Paient Number £29984 / '. ' 229084 Priority l)abi[j,:.^.-.?~);.P.f.

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^ ? A r f/>s NEW ZEALAND o'\'! Patents Act 1953 s 7* /. d COMPLETE SPECIFICATION fe ^#0/»- COMPOSITIONS AND METHOS FOR DEODORIZING TOILET HOLDING TANKS We, THETFORD CORPORATION, a corporation organized under the laws of the States of Michigan 7101 Jackson Road Ann Arbor, Michigan 48103, United States of America do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement - 1 - (Followed by 1A) COMPOSITIONS AND METHODS FOR DEODORIZING TOILET HOLDING TANKS BACKGROUND OF THE INVENTION This invention relates to deodorizing of human waste-containing solutions in toilet systems. It is particularly useful in deodorizing such waste-containing systems in which the waste has to be stored in a toilet holding tank for prolonged periods prior to disposal.

In its preferred application, this invention relates to the deodorization prior to disposal of human waste in portable chemical field toilets, chemical or storage toilets as well as fresh water flush toilets associated with aircraft, buses, trailers, boats, recreational vehicles and the like, where waste-containing material must be stored or transported for extended periods of time.

The prior art has attempted a wide variety of different approaches to the treatment and/or deodorization of human wastes or the like in chemical depositories over protracted intervals. The art-disclosed systems that have been developed for deodorization by the prior art have been satisfactory for short intervals of time because they have attempted to control odor by alleviating problems with bacterial growth and odor. This has been done primarily by employing formaldehyde or formaldehyde-like anti-microbial or biocide materials, alone or in combination with other agents. However, recent developments in transportation and environmental regulation have precluded the random discharge of waste materials, particularly where the additives contained harmful and/or non-biodegradable material such as formaldehyde or formaldehyde-like materials or heavy metal products.

'J ' t I i I . • w l_ ' I J Mazon 150, a polyamine material preferred for use in the present invention, is typically employed in the art in the form of a cationic liquid; it is used primarily as a coagulant in well water clarification. It is used as a total or partial replacement for inorganic salts and such uses. Other principal art-disclosed uses involve the treatment of wastewater where a liquid-solid separation is needed. These include gravity settling, water clarification, air floatation and filtration.

More recently, state and federal environmental protection agencies and the like have begun to show more interest in regulating when and where discharging of waste-containing materials is permissible and when and where discharging is proscribed. Such federal and state agencies are also evaluating whether they will proscribe the use of certain of these art-disclosed or art-employed agents if discharging is to be done in certain locations. Compliance with these regulations may require holding waste materials in a toilet system for a much longer period than heretofore was necessary while, at the same time, eliminating the use of some very effective agents, such as formaldehyde. This magnifies the need for various treatments, particularly odor control, by an agent that is efficacious for longer periods of time, and which is environmentally-acceptable and non-corrosive. This is true not only of buses, airplanes, boats, and the like, but also of recreational vehicles and field toilets.

Lastly, it should be noted that several designs of toilet systems are in use today. Virtually all, however, incorporate a type of holding tank where solid wastes are stored in contact with a treatment solution or medium until disposal. Accordingly, the holding tank is where the odors must be suppressed, and the treatment solution or medium contains the necessary agents. The art has felt, as noted in 4,229,408, that in order to accomplish this goal, a deodorant additive must perform certain activities, including eliminating subduing bacterial growth.

It has now been discovered that a certain class of polymer materials, heretofore unrecognized as possessing any deodorizing capability, can be employed in a treatment solution or medium at relatively low levels to control the odor from a toilet tank irrespective of its anti-bacterial activity, or lack thereof.

SUMMARY OF THE INVENTION The present invention provides compositions and methods which can control odors in toilet systems and toilet holding tanks for an extended period. The compositions and methods of the present invention employ an effective amount of a polymer material comprising a polyamine polymer material. The polyamine has the following general formula. ■<CH2)~(fH)E""'(CH2) OH wherein A, B and C are integers from 0-2, ^ and R2 are independently selected from the group consisting of methyl, ethyl, propyl and isopropyl, and X- is an environmentally-acceptable anion; and further wherein A, are such that the final polymeric material has an average molecular weight of from 000 to 250,000. In a highly preferred embodiment, the average molecular weight of the polymer material employed in the compositions and methods of the present invention is in the range of ^Keut^io,000 to ,000, and the polymer material is employed in the preferred use compositions and methods as an aqueous solution at percent of the polymer material, by weight of the final composition/holding tank solution. The preferred embodiments of the compositions and methods of the present invention may also optionally employ other additives or agents such as a surfactant, a fragrance, a thickener, a second deodorizing agent or odor-masking agent and/or a dye, all of which are preferably environmentally-acceptable.

In a highly preferred embodiment, the final compositions and methods are substantially free of formaldehyde or formaldehyde derivatives.

The methods of the present invention comprise adding to a toilet system having a holding tank an effective amount of the polymer materials or compositions described above, alone or in combination with one or more of the optional agents or additives.

In another aspect of the present invention, a use concentrate additive composition is prepared which can be added to a toilet tank system, or can be used to replenish the level of deodorizer in a toilet system. Such use concentrate or additive compositions or solutions may contain a correspondingly higher predetermined amount of the polymer or other additives or agents disclosed herein according to the size or type of the toilet system or toilet holding tank. For example, a 4oz. additive unit dosage may preferably employ about 5 to about 40, and more preferably about 5 to about 30 percent of the polymer by weight of the additive composition.

DETAILED DESCRIPTION OF THE INVENTION All percentages employed herein are by weight, unless otherwise indicated. By the term "environmentally-acceptable", as employed herein, is meant that solutions containing the material may ultimately be disposed of in a conventional manner.

It has now been surprisingly discovered that this class of polyamine materials is highly efficacious even when employed in an aqueous treatment solution or medium at very low levels in controlling the odor from a toilet system that includes a holding tank that contains human waste. Compositions and methods employing these materials have the advantage of being non-toxic, environmentally-attractive and non-corrosive.

The efficacy of this polyamine polymer material allows it to replace, in whole or in part, other art-taught and commercially employed deodorizing agents or compositions which may be undesirable from an environmental, human safety, consumer handling, corrosiveness, length of action, or cost standpoint.

The art has historically attempted to control odors with anti-microbial or biocidal additives, as odors were thought to be associated with such activity. Thus, for example, typical deodorizing methodologies, as noted above, include employing materials which are added to control bacterial or other microbial growth which has been associated with the generation of unpleasant odors. The most commonly employed of these agents are formaldehyde, or formaldehyde-like materials or derivatives, which are used to inhibit the growth of/or totally eliminate bacteria or other micro-organisms; formaldehyde is also believed to be a deodorant independent of its biocidal properties.

Many other antimicrobial materials, such as quaternary ammonium salts, have been employed to control odors. Other art-disclosed systems have employed an agent to control the pH of the holding tank solution to assist these anti-microbial agents in controlling bacteria or microbial growth.

It has now been discovered that a select class of polymer materials can be employed at a very low level to effectively control odor emission from a toilet system over a long period of time irrespective of the biological activity in the tank or system.

Accordingly, the compositions and methods of the present invention employ an effective amount of a polymeric material comprising an aqueous solution of a polyamine having the following formula (formula A) (CH2)~(f)r^(CH2)e— OH I ^ n wherein A, B and C are integers from 0-2, and R2 are independently selected from the group consisting of methyl, ethyl, propyl and isopropyl, and X- is an anion that renders the final material soluble or suspendable in use; it is preferably an environmentally-acceptable anion; and further wherein A, B, C and Tare such that the final polymeric material has an average molecular weight of from about 5,000 to about 250,000.

The polyamine materials useful in the compositions and methods of the present invention are well known in the art. An example of such a polymer is a mu material sold under the trade designation Mazon 150 by rrrw Mazer Chemicals, Inc., a division of PPG.

The method for preparing such material is well known in the art.

In a preferred embodiment, the sum of A, B, and C is three (3). More preferably. A, B, and C are each one (1).

The average molecular weight of the polymeric materials for use in the preferred compositions and methods of the present invention is in the range of about 5,000 to about 150,000. Preferably, polymeric materials employed in the compositions and methods of the present invention are in the range of about 5,000 to about 50,000, and still more preferably in the range of about -20,000 to about 30,000. ~ In general, the preferred polymeric materials of the present invention, and the methods derived therefrom, demonstrate a viscosity index range of about 25 to 750 cps. In a more preferred embodiment, such polymer or polymeric materials employed in the compositions and methods of this invention demonstrate a viscosity of about 50 to 500 cps, and still more preferably about 100 to about 500 cps In a highly preferred embodiment, the polymer materials used in the compositions of the present invention, and the methods derived therefrom, demonstrate viscosity of about 150 to about 400 cps.

The amount of polymer material that is employed in the actual use compositions (i.e., treatment solution or medium) and methods of the present invention will be an effective amount, i.e., an amount that will be sufficient to control the release or emission of unpleasant odors from the toilet holding tank or the toilet system for the desired length of time. In general, the preferred use compositions and methods of the present invention employ the polymeric materials described above in a toilet system, especially the holding tank, at a level of about .005 percent to about 1 percent, by weight, usually by weight of the treatment solution. More preferably, the compositions and methods of the present invention employ the polymer material at a level of about 0.01 to about 1, still more preferably in the range of about of 0.01 to about 0.5, and still more preferably about 0.02 to about 0.3 percent, |by weight.

In one highly preferred embodiment, the polymeric material is employed at a level of about 0.02 to about 0.2 percent by weight.

It will be appreciated that the ranges described above for the level of a polymer material are mostly applicable to the final use solution, i. e., the final toilet holding tank treatment solution or medium -generally a water solution - after addition of the polymer.

It will be appreciated, however, that the level at which the polymer material is employed will depend upon whether the artisan is formulating a final use solution as described above, or an additive or concentrate solution to be used in turn to prepare or replenish a final use solution. In general, a much higher level of a polymer material will be employed in an additive composition because of its ultimate dilution via addition to the toilet system. The amounts and levels of components selected to prepare a concentrate or additive composition will generally be selected so that, when added to the desired final use solution, the resulting use solution will contain an effective amount (include the preferred amounts) of the polymer material. In general, concentrate or additive compositions will comprise a concentrate of the selected polymer material in other agents which can be added to a toilet system to which have deodorization. For example, when employed as an additive or replenishing composition these values will be correspondingly higher as the additive or replenishing composition will be diluted when added to the holding tank to achieve these preferred ranges. Accordingly, a preferred additive composition would employ about 5 percent to about 50 percent of the polymeric material by weight of the additive composition. For example and without limitation, a four (4) oz. unit dosage formation would preferably employ about 5 percent to about 4 0 percent of the polymeric material, by weight of the additive composition; an eight (8) oz. unit dosage formulation would preferably employ about 5 percent to about 20 percent of the polymeric material by weight of the additive composition; and a sixteen (16) oz. unit dosage formulation would preferably employ about 2 percent to about 10 percent of the polymeric material by weight of the additive composition, and so on.

Optionally, other conventional or art-recognized additives may be employed in the compositions and methods of the present invention including the concentrate or additive compositions. Preferably, such additives are also environmentally-acceptable and/or non-corrosive. Such materials include surfactants. Surfactants useful in the preferred compositions and methods of the present invention, including the concentrate or additive compositions of the present invention, include those selected from the group consisting of Tergitol 15S12 (Union Carbide); Polytergent SL-62 (Olin) ; Neodol 91-8 (Shell); and Igepal C0-730 or CA-730 (GAF).

Another class of additives useful in the compositions and methods of the present invention, including the preparation of a concentrate or additive composition, are fragrances. Suitable fragrances include Orchidia Floral Fragrance 409006, Givaudan Perfume Oil PNAB 7989; Intarome Bouquet 26269; and Naarden N13736.

Another class of additives that may be employed in the compositions and methods of the present invention, including the preparation of an additive or concentrate composition, are other deodorizers. These deodorizers may include those of the conventional anti-microbial-anti-bacterial type or the masking type. Such materials include formaldehyde and formaldehyde derivatives, buffers, quaternary ammonium materials, and the like. However, in a preferred embodiment, the methods and composition are substantially free of formaldehyde or formaldehyde derivatives.

Another class of additives useful in the compositions and methods of the present invention, including the preparation of a concentrate or additive composition, are dyes or pigments. Such materials are generally added to esthetically mask the appearance of any visible portion of the holding tank solution. Such materials include Basic Blue 26, Basonyl Blue 640; Basic Yellow 65; Flexo Yellow NB-117; Basic Green 4; and Basonyl Green NB 832; all manufactured by BASF.

Another class of agents that can be employed in the compositions and methods of the present invention, including the formulation of a concentrate or additive solution or composition, are thickeners. These are preferably selected from the group consisting of UCARE polymer JR-cationic cellulose ether (Amerchol); Bermocoll nonionic cellulose ether (Berol Chemical; and Polyox-ethylene oxide (Union Carbide) and Cellosize-hydroxy ethyl cellulose (Union Carbide).

It will be appreciated from above that the methods of the present invention involve controlling or eliminating odor from a toilet system that includes a toilet tank by adding to a toilet tank in need of said odor control an effective amount of a polymeric material described above.

The following examples of the compositions and methods of the present purpose are for illustrative purposes only, and are not intended to be limiting.

EXAMPLE I - IN USE -.004% 0.15% .002% .002% Mazon 150 0.5% Naarden N13736 Igepal C0-730 Basic Blue 26 Bermocoll Polyamine .005 - .0008 .002 - 0 - 0 - Water qs o % 2.5% 8% 1% 1% EXAMPLE II - CONCENTRATE Mazon 150 Polyamine Naarden N13736 Igepal C0-730 Basic Blue 26 Bermocoll Water O O 12 nor.'.'. " »_ i J \ > o t

Claims

WHAT WE CLAIM IS:

1. A method of controlling the odor from a toilet system including a holding tank comprising employing in said toilet system an aqueous solution containing an effective amount of a polymeric material comprising a polyamine having the following formula wherein A, B and C are integers from 0-2, Rx and Rj are independently selected from the group consisting of methyl, ethyl, propyl and isopropyl, and X- is an anion; and further wherein A, B, C and n are such that the final polymeric material has an average molecular weight of from substantially 5,000 to substantially 250,000.

2 . A method according to claim 1 wherein the sum of A, B and C is 3.

3. A method according to claim 1 wherein A, B and C are 1, and n is such that said final polymeric material has an average molecular weight of substantially 5,000 to N© OH R, n substantially 250,000.

4. material 5,000 to A method according to claim 1 wherein the polymer has an average molecular weight of substantially substantially 150,000.

5. A method according to claim 1 wherein the polymer material has an average molecular weight of substantially 20,000 to substantially 30,000.

6. A method according to claim 1 wherein the polymer material demonstrates a viscosity of substantially 25 to substantially 750 cps.

7. A method according to claim 1 wherein the polymer material demonstrates a viscosity of substantially 50 to substantially 500 cps.

8. A method according to claim 1 wherein the polymer material demonstrates a viscosity of substantially 150 to substantially 400 cps prior to addition.

9. A method according to claim 1 wherein the polymeric material is employed in the toilet system at a level of substantially 0.005 to substantially 1 percent by weight of the treatment solution or medium.

10. A method according to claim 1 wherein the

' '' ~ £ "V polymeric material is employed in the toilet system at av^ ' '' .<*•;J;level of substantially 0.01 to substantially 1 percent by weight of the treatment solution or medium.;11. A method according to claim 1 wherein the polymeric material is employed in the toilet system at a level of substantially 0.02 to substantially 0.3 percent by weight of the treatment solution or medium.;

12. A method according to claim 4 wherein the polymeric material is employed in the toilet system at a level of substantially 0.02 to substantially 0.02 percent by weight of the treatment solution or medium.;

13. A method according to claim 1 that additionally comprises employing a surfactant.;

14. A method according to claim 1 that additionally comprises employing a fragrance.;

15. A method according to claim 1 that additionally comprises employing a deodorizer.;

16. A method according to claim 1 that additionally comprises employing a dye.;

17. A method according to claim 1 that additionally comprises employing a thickener.;{K;/<* •v r 14 NOV 1991 W

18. A method according to claim 1 wherein the anion is environmentally-acceptable.

19. A method according to claim 1 wherein the anion is chlorine.

20. A method according to claim 1 wherein the aqueous solution is substantially free of formaldehyde or formaldehyde derivatives.

21. A toilet system additive composition comprising (a) an effective amount of a polymeric material having the formula OH •(CH2)- ^2 I -N@ I Ri X© n wherein A, B and C are integers from 0-2, R, and R2 are independently selected from the group consisting of methyl, ethyl, propyl and isopropyl, and X- is an anion; and further wherein A, B, C and n are such that the final polymeric material has an average molecular weight of from substantially 5,000 to substantially 250,000. 16

22. A composition according to additionally comprises a fragrance. claim 21 which

23. A composition according to claim 21 which additionally comprises a dye.

24. A composition according to claim 21 which additionally comprises a thickener.

25. A composition according to claim 21 wherein the final additive composition employs the polymeric material is present at a level of substantially 5 percent to substantially 50 percent, by weight of the composition.

26. A composition according to claim 21 which is substantially free of formaldehyde or formaldehyde derivatives.

27. A method according to claim 1 substantially as herein described or exemplified.

28. A toilet system additive compositior claim 21 substantially as herein described or THETFORD CORPORATION ^ gy HENF Per