EP0844301B1 - Method of removing mold from plastic bottles and mold removing additive - Google Patents

Method of removing mold from plastic bottles and mold removing additive Download PDF

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Publication number
EP0844301B1
EP0844301B1 EP97203528A EP97203528A EP0844301B1 EP 0844301 B1 EP0844301 B1 EP 0844301B1 EP 97203528 A EP97203528 A EP 97203528A EP 97203528 A EP97203528 A EP 97203528A EP 0844301 B1 EP0844301 B1 EP 0844301B1
Authority
EP
European Patent Office
Prior art keywords
surfactant
group
sodium
bottles
mold
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97203528A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0844301A3 (en
EP0844301A2 (en
Inventor
Carol A. Rouillard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Diversey Inc
Original Assignee
JohnsonDiversey Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JohnsonDiversey Inc filed Critical JohnsonDiversey Inc
Publication of EP0844301A2 publication Critical patent/EP0844301A2/en
Publication of EP0844301A3 publication Critical patent/EP0844301A3/en
Application granted granted Critical
Publication of EP0844301B1 publication Critical patent/EP0844301B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/36—Organic compounds containing phosphorus
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/02—Inorganic compounds ; Elemental compounds
    • C11D3/04—Water-soluble compounds
    • C11D3/06—Phosphates, including polyphosphates
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
    • C11D2111/10—Objects to be cleaned
    • C11D2111/14—Hard surfaces
    • C11D2111/18—Glass; Plastics

Definitions

  • bottles such as soft drink bottles are repeatedly cleaned and reused.
  • the used bottles are passed through a bottle-washing apparatus which cleans the bottle, permitting it to be refilled and reused.
  • Both plastic and glass bottles are subject to reuse.
  • Mold tightly adheres to the surface of bottles, both plastic and glass, and is relatively difficult to remove. Mold can be removed from glass bottles by simply operating at temperatures above 60°C, which is typically done. But with plastic containers, this is not possible. At temperatures higher than 60°C, most plastic containers will shrink. Further, higher temperatures and higher alkalinity promote stress cracking which is unsightly and eventually can cause the bottle to leak or break open. Certain surfactants also promote stress cracking. Other harsh chemicals such as bleaches will remove mold. But these would corrode the equipment and therefore are unacceptable. EDTA is currently used to enhance mold removal. However, this is not always totally effective.
  • the present invention is premised upon the realization that an alkaline wash solution which includes an effective amount of a complex phosphate, in combination with a suitable surfactant, either nonionic or anionic, will effectively remove mold from plastic surfaces at temperatures less than 60°C. This, in turn, permits the removal of mold from the plastic surface without destruction of the plastic container. Accordingly, the present invention provides a method of removing mold colonies from plastic bottles, as specified in claim 1.
  • the present invention is premised on the realization that the removal of mold is enhanced by the further addition of an effective amount of a phosphonate which is also useful in the cleaning of the bottle.
  • the bottle-washing solution will also include a chelating agent such as sodium gluconate, sodium glucoheptonate, or sodium boroheptonate.
  • gluconates are considered to be less effective at milder alkalinities, it provides a significant improvement in mold removal in this system.
  • These combined components provide an extremely effective bottle-washing solution which outperforms currently-used bottle washing formulations in the removal of mold from plastic surfaces.
  • the formulation of the present invention even with the added surfactant, does not further promote stress cracking relative to commercially available formulations. Although formulated primarily for plastic containers, this formulation will also assist in removal of mold from glass containers as well. Accordingly, the present invention provides a method of removing mold from plastic bottles and a mold removal agent according to claim 8 respectively claim 9.
  • the Figure is a graph showing the test results of Example 2 demonstrating mold removal from bottles in a commercial bottle washing apparatus.
  • the present invention is a method and solution for cleaning reusable plastic bottles and is particularly directed at mold removal.
  • the reusable plastic bottles cleaned according to the present invention can be formed from many different plastics.
  • Most reusable plastic bottles are currently formed from polyesters such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, and polycarbonate.
  • any reusable plastic bottle which can be subjected to an alkaline wash is suitable for use in the present invention.
  • bottle washing apparatuses generally include three or four sections.
  • the bottles are introduced into the machine and supported throughout the washing process by individual holders or pockets.
  • Bottles are initially directed to a prerinse section which is designed to remove large particles and labels.
  • water and residuals from the cleaning process are directed at the bottles as they are introduced into the machine.
  • the bottles are conveyed to a cleaning or soaking section where they are soaked in a caustic solution at an elevated temperature, generally no higher than 60°C for plastic bottles such as PET bottles. After 7 to about 30 minutes (generally 9-11 minutes) in the soaking section the bottles are taken to a warm rinse and then to a final potable water rinse. The final rinse is then reused for the subsequent initial prerinse.
  • the cleaning or soaking solution is a caustic solution.
  • this contains 0.5 to 5.0%, and preferably 1.0 to 3.0%, sodium hydroxide for PET containers. This acts to clean the bottles and dissolve metals such as metal foils of the label and the closure rings.
  • This caustic solution also, in combination with temperature and contact time, renders the bottles commercially sterile. However, at caustic concentrations greater than 3% stress cracking of the plastic bottles is excessive.
  • the soaking solution will include an additive to enhance mold removal.
  • the mold-removing additive is a combination of complex phosphates, surfactants, and preferably chelating agents, particularly gluconates and related agents, as well as threshold water conditioners such as the phosphonates.
  • the additive itself is formed in a concentrated stable aqueous solution or a premixed powder which is formulated with the above components in a proportion to provide for effective use concentration of all the components when added.
  • the soaking solution in the bottle washing apparatus i.e., at use concentration, should have 1000 to 2500 ppm of the complex phosphates.
  • Complex phosphates include the common polyphosphates. Particular phosphates which can be employed include sodium tripolyphosphate, potassium tripolyphosphate, sodium potassium tripolyphosphate, tetrapotassium pyrophosphate, and tetrasodium pyrophosphate, as well as others.
  • the wash solution must include an effective amount of a surfactant, either an anionic surfactant, a nonionic surfactant, an amphoteric surfactant, or a mixture thereof. It is important that the surfactants be selected so that they do not promote stress cracking of the plastic bottles.
  • the most effective nonionic surfactants are the polyalkoxylated fatty alcohols and the polyethoxylated straight chain alcohols. These are also preferred since they contribute to foam control.
  • alkoxylated alcohol surfactants include Makon NF 12, Plurafac LF 221, Plurafac LF 223, Plurafac LF 431, Polytergent SLF18, and Triton DF12, a modified polyethoxylated alcohol.
  • suitable nonionics include alkyl polyglycosides such as Triton BG10, Triton CGIO, and EO -PO block copolymers such as Industrol N-3.
  • Suitable anionics include sodium C 14 - C 16 alpha olefin sulfonates such as Bioterge AS-40, alkyl aryl sulfonates, carboxylated alcohols such as Polytergent CSI, alkali metal salts of phosphate esters such as Triton H66, alkali metal alkanoates such as Monatrope 1250, fatty alcohol polyglycol ether carboxylic acids such as Akypo LF 4, dioctylsulfosuccinate such as Monawet MO70, modified ethoxylates such as Mona NF 10 and Triton DF 20, and alkali metal xylene sulfonates such as Eltesol PX93.
  • alkali metal salts of phosphate esters such as Triton H66
  • alkali metal alkanoates such as Monatrope 1250
  • fatty alcohol polyglycol ether carboxylic acids such as Akypo LF 4, diocty
  • Suitable amphoterics include alkyl and alkyl alkoxy iminodiproprionates such as lauryl iminodiproprionate and isodecyloxypropyl iminodipropionate sold under the trademark Alkali surfactant.
  • An amount of from 200-1000 ppm surfactant will be used in the soaking solution.
  • the upper limit is determined by economics. Concentrations greater than 1000 ppm provide little added benefit.
  • a blend of surfactants may be preferred to reduce stress cracking and improve efficiency.
  • the formulation optionally includes 500-1000 ppm of an organic phosphonate.
  • organophosphonates include aminotrimethylene phosphonic acid, 1-hydroxyethylene (1,1 diphosphonic acid), hexamethylenediaminetetramethylene phosphonic acid, diethylenetriaminepentamethylene phosphonic acid, and phosphonobutanetricarboxylic acid. These assist not only in mold removal, but also carry over to the rinse section of the bottle washer to provide threshold water conditioning in that section, reducing scale.
  • the present invention can also include one or more chelating agents.
  • Suitable chelating agents are the gluconates and comparable compositions. Particular chelating agents include sodium gluconate or gluconic acid, sodium glucoheptonate, and sodium boroheptonate. These should be present in the wash solution at a concentration of from 500 ppm to 2000 ppm.
  • the concentrated formulation can be stated in terms of a ratio of parts by weight actives.
  • the mold removing composition of the present invention will generally include from 10 to 25 parts by weight of the complex phosphate, 2 to 10 parts by weight of the surfactant, and optionally but preferably 5 to 10 parts by weight of the phosphonate, and 5 to 20 parts by weight of the chelating agent, which is preferably sodium gluconate.
  • Said surfactant is desirably either an anionic surfactant selected from alkylaryl sulfonates, C 14 -C 16 alpha olefin sulfonates and alkyl sulfosuccinates, or a nonionic surfactant selected from polyalkoxylated fatty alcohols and polyethoxylated straight chain alcohols. Most preferred surfactant for use in said composition is iminodipropionate. If said composition is formulated as a liquid, it will also include an amount of caustic liquid to maintain an alkaline pH. The balance of the product would then be water. Generally, it is desirable to have as high an actives content as possible. With the present formulation, an actives content of 40% to 50% can be achieved.
  • Table 1 shows three different liquid formulations of the present invention. With liquid formulations, each of the individual components is simply combined with water. The order of addition is not significant. These are blended until a stable solution is formed.
  • Raw Materials Formula 1 Formula 2 Formula 3 Soft Water 50.87 51.07 53.24 Sodium Gluconate 7.0 7.0 7.0 Dequest 2000 3.0 3.0 3.0 Caustic Liquid 50% 2.0 2.0 2.0 KTPP Liquid 50 27.13 27.13 27.13 Plurafac LF221 (Nonionic 95%) 1.0 (0.95) 0.32 (0.30) Plurafac LF223 (Nonionic 98%) 1.0 (0.98) 0.31 (0.30) Triton BG 10 (Nonionic 70%) Akypo LF4 (Anionic 90%) 2.0 (1.8) 2.0 (1.8) 2.0 (1.8) Eltesol PX93 7.0 6.8 5.0
  • An amount of the concentrated composition is added to the soaking solution to provide an acceptable level of actives in the soaking solution.
  • the use concentration will be 0.5 to 1.5% with 1.25% preferred.
  • test results indicate that the sodium tripolyphosphate, in combination with the nonionic surfactant, is particularly effective at removing mold, and that the Formula 3 is a significant improvement over the combination of sodium tripolyphosphate and nonionic surfactant by itself. Further, test results indicated that the addition of Formula 3, in spite of the use of the surfactant, promoted less stress cracking than other commercial additives. Thus, the present invention provides better mold removal and promotes less stress cracking than commercially available products.
  • Exemplary dry formulations which are useful in assisting mold removal are listed below, as well as an indication of mold removal efficacy in laboratory studies: POWDERS Material: Weight Percent STPP, granular 45.00 SKTP, granular 63.00 Sodium gluconate 25.00 25.00 Dequest 2016D 6.00 6.00 Makon NF 12 6.00 Soda Ash 15.00 Poly Tergent SLF-18 6.00 Poly Tergent CS-1 3.00 Mold Removal 90-100% 100% W/w additives 0.4% 0.4% NaOH 2.80% 1.50%

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Detergent Compositions (AREA)
  • Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
EP97203528A 1996-11-26 1997-11-12 Method of removing mold from plastic bottles and mold removing additive Expired - Lifetime EP0844301B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US75603496A 1996-11-26 1996-11-26
US756034 1996-11-26

Publications (3)

Publication Number Publication Date
EP0844301A2 EP0844301A2 (en) 1998-05-27
EP0844301A3 EP0844301A3 (en) 1999-03-03
EP0844301B1 true EP0844301B1 (en) 2003-03-26

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP97203528A Expired - Lifetime EP0844301B1 (en) 1996-11-26 1997-11-12 Method of removing mold from plastic bottles and mold removing additive

Country Status (5)

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EP (1) EP0844301B1 (da)
CA (1) CA2221470C (da)
DE (1) DE69720143T2 (da)
DK (1) DK0844301T3 (da)
ES (1) ES2196256T3 (da)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6362149B1 (en) 2000-08-03 2002-03-26 Ecolab Inc. Plastics compatible detergent composition and method of cleaning plastics comprising reverse polyoxyalkylene block co-polymer
US6835702B2 (en) 2000-11-07 2004-12-28 Ecolab Inc. Compositions and methods for mitigating corrosion of applied color designs
WO2002038715A2 (en) * 2000-11-07 2002-05-16 Ecolab Inc. Cleaning compositions and cleaning methods for mitigating corrosion of applied color designs
MXPA05002890A (es) 2002-09-18 2005-06-22 Ecolab Inc Aditivo para utilizarse en composiciones de lavado de botellas.
ES2356347T3 (es) * 2004-11-03 2011-04-07 Johnsondiversey, Inc., Metodo de limpieza de recipientes para reciclar.
DE102007022110A1 (de) 2007-05-11 2008-11-13 Edmund Bromm Verfahren zum Beseitigen und Abtöten von Schimmel
US11028344B2 (en) 2016-08-16 2021-06-08 Diversey, Inc. Composition for aesthetic improvement of food and beverage containers and methods thereof

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1937031A1 (de) * 1968-07-22 1970-01-22 Monsanto Co Inhibiermittel,Waschzubereitungen,deren Loesungen und Anwendungsverfahren
JPS61118499A (ja) * 1984-11-14 1986-06-05 株式会社　ネオス スプレ−洗浄用洗浄剤
JPH07116474B2 (ja) * 1993-06-11 1995-12-13 ティーポール株式会社 高濃度アルカリ液体洗浄剤組成物及びその製造方法

Also Published As

Publication number Publication date
EP0844301A3 (en) 1999-03-03
DE69720143D1 (de) 2003-04-30
DE69720143T2 (de) 2003-09-11
DK0844301T3 (da) 2003-07-21
EP0844301A2 (en) 1998-05-27
CA2221470C (en) 2008-08-12
ES2196256T3 (es) 2003-12-16
CA2221470A1 (en) 1998-05-26

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