EP0946701B1 - Reinigungsverfahren für polyethlyen-terephtalat-behälter - Google Patents

Reinigungsverfahren für polyethlyen-terephtalat-behälter Download PDF

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Publication number
EP0946701B1
EP0946701B1 EP96941351A EP96941351A EP0946701B1 EP 0946701 B1 EP0946701 B1 EP 0946701B1 EP 96941351 A EP96941351 A EP 96941351A EP 96941351 A EP96941351 A EP 96941351A EP 0946701 B1 EP0946701 B1 EP 0946701B1
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EP
European Patent Office
Prior art keywords
concentrate
wash solution
acid
builder
sodium
Prior art date
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EP96941351A
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English (en)
French (fr)
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EP0946701A1 (de
EP0946701A4 (de
Inventor
Bruce R. Cords
Gerald K. Wichmann
Guang-Jong Jason Wei
David D. Mcsherry
Brendon L. Herdt
Arturo Valencia
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Ecolab Inc
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Ecolab Inc
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Classifications

    • 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
    • C11D3/042—Acids
    • 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
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/02—Anionic compounds
    • C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
    • C11D1/22—Sulfonic acids or sulfuric acid esters; Salts thereof derived from aromatic compounds
    • C11D1/24—Sulfonic acids or sulfuric acid esters; Salts thereof derived from aromatic compounds containing ester or ether groups directly attached to the nucleus
    • 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
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/66—Non-ionic compounds
    • 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
    • C11D3/044—Hydroxides or bases
    • 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
    • C11D3/20—Organic compounds containing oxygen
    • C11D3/2075—Carboxylic acids-salts thereof
    • 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
    • C11D3/34—Organic compounds containing sulfur
    • C11D3/3418—Toluene -, xylene -, cumene -, benzene - or naphthalene sulfonates or sulfates
    • 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
    • C11D3/361—Phosphonates, phosphinates or phosphonites
    • 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
    • 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
    • C11D3/34—Organic compounds containing sulfur
    • C11D3/3409—Alkyl -, alkenyl -, cycloalkyl - or terpene sulfates or sulfonates

Definitions

  • the invention relates generally to methods and compositions for cleaning polyethylene terephthalate containers. More specifically, the invention relates to methods and compositions which remove mold, present on polyethylene terephthalate containers, with reduced hazing.
  • Plastic containers may be made from any number of materials depending on the application.
  • One material is polyethylene terephthalate, "PET”.
  • PET polyethylene terephthalate
  • Two types of PET bottles that are commonly used are single trip and multi-trip bottles. Single trip bottles are those which are filled, used, and then discarded. Multi-trip bottles are collected and reused and must be washed before refilling.
  • PET bottles offer several advantages over glass. Their light weight reduces freight costs. When dropped onto a hard surface they do not shatter like glass and generally do not break. Conveyor wear caused by the containers in the packaging plant is also reduced. The closure is also generally reusable after a bottle has been opened.
  • PET bottles are easily scratched, and susceptible to chemical attack when they are washed. PET containers also do not tolerate conditions above 60°C. Exposing them to higher temperatures than 60°C causes deformation and/or shrinkage of the bottles.
  • the cleaning of PET bottles takes place over a series of steps using caustic immersion tanks and spray wash stages in a bottlewasher. In the wash tanks, product residue, dirt, labels and labeling adhesive are removed. Because the surface of PET bottles is hydrophobic, cleaning them is more difficult than glass bottles. Also, the lower washing temperature decreases the chemical activity of the bottlewashing solution.
  • the necessary cleaning temperature for PET bottles is 60°C or less due to the glass transition temperature of PET. If exceeded, PET bottles deform and shrink.
  • the cleaning power of a bottlewashing solution at 60°C is only one quarter that at 80°C.
  • Bottles returned with product residue, i.e., those bottles that have not been rinsed, are almost always contaminated with microbiological forms of life.
  • the bottle washing solution eliminates the presence of microbiological forms of life such as bacteria, spores, molds, and yeasts present in the bottle.
  • molds often present a persistent problem in the cleaning and reuse of PET bottles.
  • PET bottles simply cannot be washed like glass. Glass bottles are normally washed at 80°C. Glass can also be washed with a relatively high concentration of caustic. While glass may be washed with up to 5.0% caustic, as little as 1.5% caustic can cause hazing in a PET container. With glass the washing temperature, the caustic concentration, and the washing time may be adjusted to allow for variability within the environment. In contrast, PET containers cannot withstand high levels of any of these variables.
  • the first aspect of the invention is a method for cleaning a polyethylene terephthalate container as defined in the annexed claims.
  • the method includes combining a first concentrate with a second concentrate in an alkaline wash solution.
  • the first concentrate includes from about 0.3 to 25 wt-% of a surfactant and from about 5 to 30 wt-% of an acid.
  • the second concentrate includes from about 8 to 60 wt-% of a builder.
  • the method further includes the step of contacting the PET container with the wash solution wherein the removal of soil is undertaken with minimal hazing of the container.
  • the method of the invention for cleaning plolyethylene terephthalate containers which includes contacting the container with an alkaline wash solution having a temperature ranging from about 50°C to 60°C.
  • the alkaline wash solution is formulated from a first concentrate, a second concentrate, an alkalinity source, and a balance of water.
  • the first concentrate includes a nonionic surfactant, a first builder, and acid in an amount effective to provide a phase stable solution.
  • the second concentrate includes a nonionic surfactant and a second builder.
  • the first and second concentrate are present in the wash solution in a concentration ranging from about 0.5 wt-% to 1.2 wt-%, and the first nonionic surfactant has a cloud point ranging from about 5°C to 60°C.
  • a further aspect of the invention is an alkaline wash solution for cleaning polyethylene terephthalate bottles as defined in the appended claims.
  • the wash solution includes from about 1 to 5 wt-% of a source of alkalinity, from about 480 to 4000 ppm of a builder, from about 6 to 500 ppm of surfactant, and from about 20 to 800 ppm of a coupler.
  • the invention is compositions and methods for cleaning polyethylene terephthalate (PET) bottles with enhanced removal of mold and reduced hazing.
  • PET polyethylene terephthalate
  • the compositions of the invention include surfactants and builder combination, which heightens cleaning and removes mold.
  • Hazing generally results from chemical etching caused by caustic present in the wash solution. Hazing is a clouding or dulling of the PET container surface which detracts from the aesthetic character of the container. Surprisingly, it has been found that by using surfactants with appropriate cloud points, hazing may be substantially reduced. Preferably, PET containers treated with the wash solution of the invention are substantially free of hazing.
  • mold growth particularly in the inside of returned PET bottles, proves to be a major challenge in bottle washing. Molds are very difficult to remove, even with a solution having as much as 3% caustic. Good cleaning usually removes most of the organic components of mold. However, the inorganic residues of mold may remain on the PET container surface. This may cause a problem similar to water spots. This condition gives a positive test result by methylene blue staining, (Industrial Code of Practice for Refillable PET Bottles, Edition 1 (1993-1994 UNESDA/CESDA, pg. V-18).
  • the compositions and methods of the invention substantially remove soils and both the organic and inorganic residues of mold.
  • the wash solution of the invention is formulated from two concentrate compositions. These two concentrate compositions are combined in an aqueous wash solution with an alkalinity source, before use. These concentrate compositions comprise surfactants, an acid, builders such as sequestrants and chelating agents, coupling agents, and various other adjuvants as defined in the claims.
  • compositions of the invention comprise surfactants to facilitate low foaming cleaning, and prevent hazing of the PET container.
  • surfactants Any number of surfactants may be used in accordance with the invention including nonionic surfactants, anionic surfactants, amphoteric surfactants, and mixtures thereof.
  • Nonionic surfactants encompass a wide variety of polymeric compounds which include specifically, but not exclusively, ethoxylated alkylphenols, ethoxylated aliphatic alcohols, ethoxylated amines, ethoxylated ether amines, carboxylic esters, carboxylic amides, and polyoxyalkylene oxide block copolymers.
  • nonionic surfactants used in the invention are those which comprise ethylene oxide moieties, propylene oxide moieties, as well a mixtures thereof, and ethylene oxide propylene oxide moieties in either heteric or block formation. Additionally useful in the invention are nonionic surfactants which comprise alkyl ethylene oxide compounds, alkyl ethylene oxide-propylene oxide compounds and alkyl ethylene oxide-butylene oxide compounds, as well as mixtures thereof.
  • the ethylene oxide propylene oxide moiety and ethylene oxide-butylene oxide moiety may be in either heteric or block formation.
  • nonionic surfactants having any mixture of combination of ethylene oxide-propylene oxide moieties linked to an alkyl chain where the ethylene oxide and propylene oxide moieties may be in any randomized or ordered pattern and of any specific length.
  • Nonionic surfactants useful in the invention may also comprise randomized sections of block and heteric ethylene oxide propylene oxide, or ethylene oxide-butylene oxide.
  • Preferred nonionic surfactants include alkylphenols, alcohol ethoxylates, and block copolymers of ethylene oxide and propylene oxide.
  • nonionic surfactants found useful in the invention include (EO)/(PO) block copolymers having at least about 3 moles (EO) and at least about 15 moles TO); aryl or aliphatic ethoxylates having at least about 3 moles (EO) which may or may not be capped with methyl, butyl, or benzyl moieties; aryl or aliphatic ethoxylate-propoxylate copolymers having at least about 2 moles of (EO) and from about 4 moles of (PO) and which may also be capped with methyl, butyl or benzyl; and aryl or aliphatic ethoxylate-butoxylate copolymers having at least about 2 moles of (EO) and about 4 moles of (BO) and which may also be capped with methyl, butyl or benzyl.
  • the aliphatic group may comprise any branched or linear C 8 -C 24 moiety.
  • the aryl group may generally comprise aromatic structures such
  • nonionics which are useful in the invention include EO/PO block copolymers available from Henkel KGaA; Pluronic L62 and L44 which are EO/PO block copolymers available from BASF; Tergitol 15-S-3, TMN3, TMN10 which are ethoxylated alcohols available from Union Carbide; Surfonic L24-1.3 which is a linear alcohol ethoxylate available from Texaco Chemical Co.; nonyl phenol ethoxylates such as NPE 4.5, NPE 9, and Surfonic N120 available from Texaco Chemical Co.; ethoxylated alkyl amines such as ethoxylated coco amine available from Sherex Chemical Co. as Varonic K-215; and benzylated alcohol ethoxylates and EO/PO block copolymers among other nonionic surfactants.
  • the surfactant system comprises surfactants having a cloud point of about 5°C to 60°C, preferably from about 10°C to 50°C, and more preferably of about 10 to 20°C so that in the alkaline wash solution, the surfactants will oil-out or film and deposit on the PET container surface providing protection against hazing.
  • One preferred line of surfactants includes Dehypon LT104 which is a C 12-18 fatty alcohol (EO) 10 butyl capped and LS24 which is a C 12-14 fatty alcohol ((EO) 2 (PO) 4 ) both available from Henkel Canada Ltd.
  • Dehypon LT104 which is a C 12-18 fatty alcohol (EO) 10 butyl capped
  • LS24 which is a C 12-14 fatty alcohol ((EO) 2 (PO) 4 ) both available from Henkel Canada Ltd.
  • Anionic surfactants may also be used in the invention.
  • Typical commercially available anionic surfactants provide either a carboxylate, sulfonate, sulfate or phosphate group as the functional anion.
  • carboxylate based anionic surfactants such as alcohol ethoxylate carboxylates reduce hazing of the container.
  • Neodox 23-4TM available from Shell Chemical Co.
  • amphoteric surfactants may also be used in the invention.
  • amphoteric surfactants include betaine surfactants, sulfobetaine surfactants, sarcosinate surfactants, amphoteric imidazolinium derivatives and others.
  • Certain surfactants found useful in hazing reduction include cocoyl and lauroyl sarcosine/sarcosinates such as Hamposyl C and L available from Hampshire Chemical Co.
  • the composition of the invention also comprises an acid source.
  • the acid functions to stabilize the surfactant system so that prior to mixing in the wash solution, the concentrate is a true phase stable solution. Once added to the alkaline wash solution the acids are neutralized, become salts, and provide heightened cleaning efficacy and retard the formation of scaling on washing machine components.
  • the acid may be any number of organic or inorganic acids.
  • Inorganic acids useful in the composition and the invention include phosphoric acid, polyphosphoric acid or acidic pyrophosphate salts, among others.
  • Organic acids useful in the invention include mono and polycarboxylic acids such as acetic acid, hydroxyacetic acid, citric acid, gluconic acid, glucoheptanoic acid, lactic acid, succinic acid, malonic acid, glutaric acid, and mixtures thereof.
  • the composition of the invention also comprises a builder.
  • Builders i.e., sequestrants and chelating agents, retard the precipitation of scale onto the side walls of the PET container and the bottle washing machine.
  • Builders also facilitate soil suspension, bind hardness ions and, in turn, enhance cleaning, during the washing process.
  • the first concentrate may contain a first builder and the second concentrate may contain a second builder.
  • Builders which may be used in accordance with the invention include sequestrants such as phosphonates, phosphinates, acrylates and polyacrylates, and polycarboxylates, among others. Also useful as builders are maleate polymers and copolymers of maleate and acrylate; salts such as polyaspartic and poly glutaric acid salts; erythorbic acid; polyacrylamidopropyl sulfonate; and phosphino carboxylic acid, among others.
  • sequestrants such as phosphonates, phosphinates, acrylates and polyacrylates, and polycarboxylates, among others.
  • maleate polymers and copolymers of maleate and acrylate salts such as polyaspartic and poly glutaric acid salts; erythorbic acid; polyacrylamidopropyl sulfonate; and phosphino carboxylic acid, among others.
  • Water soluble acrylic polymers which may be used include polyacrylic acid, polymethacrylic acid, acrylic acid-methacrylic acid copolymers, hydrolyzed polyacrylamide, hydrolyzed methacrylamide, hydrolyzed acrylamide-methacrylamide copolymers, and mixtures thereof.
  • Water soluble salts or partial salts of these polymers such as their respective alkaline metal (for example sodium or potassium) or ammonium salts can also be used.
  • phosphonic acids and phosphonic acid salts are also useful as builders.
  • Such useful phosphonic acids include, mono, di, tri, tetra and, penta phosphonic acids which can contain groups capable of forming anions under alkaline conditions.
  • the phosphonic acid may also comprise a lower molecular weight phosphonopolycarboxylic acid such as one having about 2-4 carboxylic moieties and about I to 5 phosphonic acid groups.
  • Such acids include 1 phosphono-1-methylsuccinic acid, phosphonosuccinic acid and 2-phosphonobutane-1,2,4 tricarboxylic acid.
  • Preferred sequestrants include the Dequest® sequestrants available from Monsanto Co. including Dequest 2006® which is amino tri(methylene phosphonic acid) pentasodium salt; Dequest 2010® which is 1-hydroxyethylidene-1,1-diphosphonic acid; Bayhibit AM® available from Mobay Chemical Co. which is 2-phosphonobutane-1,2,4-tricarboxylic acid; Dequest 2000® which is aminotri(methylene phosphonic acid); and Belsperse 161® from Ciba Geigy which is a phosphino polycarboxylic acid.
  • Dequest 2006® which is amino tri(methylene phosphonic acid) pentasodium salt
  • Dequest 2010® which is 1-hydroxyethylidene-1,1-diphosphonic acid
  • Bayhibit AM® available from Mobay Chemical Co. which is 2-phosphonobutane-1,2,4-tricarboxylic acid
  • Dequest 2000® which is aminotri(methylene phosphonic acid
  • the builder present in either concentrate may also be a chelating agent.
  • the chelating agent tends to bind alkali earth metals present in the wash solution and hold these compounds in solution. It is believed that mold uses the organic portion of nutrients leaving behind inorganic salts. As a result, the ineffective removal of mold is often indicated by inorganic salts which are left behind on the surface of the PET container. The chelating agent removes these inorganic salts that are found underneath the mold.
  • the number of bonds capable of being formed by a chelating agent upon a single hardness ion is reflected by labeling the chelating agent as bidentate (2), tridentate (3), tetradendate (4), etc. Any number of chelating agents may be used in accordance with the invention.
  • Representative chelating agents include salts of amino carboxylic acids, phosphonic acid salts, water soluble acrylic polymers, among others.
  • Suitable, amino carboxylic acid chelating agents include N-hydroxyethyliminodiacetic acid, nitrilotriacetic acid (NTA), ethylenediaminetetraacetic acid (EDTA), N-hydroxyethyl-ethylenediaminetriacetic acid (HEDTA), and diethylenetriaminepentaacetic acid (DTPA), as well as isoserine-N,N-diacetic acid, beta alanine N,N-diacetic acid, sodium glycolate, and tripolyphosphate, among others.
  • the second builder present in the second concentrate comprises an amino carboxylic acid chelating agent, preferably of ethylene diamine tetracetic acid or salts thereof.
  • the composition of the invention also includes a coupling agent.
  • the coupling agent functions to stabilize the concentrate composition so that it is a true phase stable solution.
  • any number of organic coupling agents may be used including sulfates, sulfonates, as well as monofunctional and polyfunctional alcohols.
  • Preferred coupling agents include sulfonate and sulfate compounds such as sodium xylene sulfonate, sodium cumene sulfonate, sodium toluene sulfonate, 2-ethylhexyl sulfate, alkyl diphenyl oxide disulfonate where the alkyl group is either a branched C 12 or a linear C 10 , sodium alkyl naphthalene sulfonate, and sodium octane sulfonate and disulfonate, and mixtures thereof.
  • Those coupling agents which have been found useful include linear alkyl alcohols such as, for example, ethanol, isopropanol, and the like. Also useful are polyfunctional hydroxy compounds such as alkylene glycols like hexylene glycol and propylene glycol; phosphate esters including Gafac RP710 from Rhone-Poulence Chemicals, and Triton H-66 from Rohm & Haas Co.
  • compositions and methods of the invention may use any number of other adjuvants such as added nonionic surfactant defoamers such as those disclosed in U.S. Patent No. 5,516,451 to Schmitt et al. which is incorporated herein by reference.
  • Tracing compounds such as potassium iodide, colorants and dyes, fragrances, and preservatives, among other constituents are also useful in the invention.
  • the method of the invention provides heightened cleaning efficacy of PET containers, removing soils, inorganic salts, and molds while retarding hazing of the containers. This result is obtained by formulating a first acidic concentrate with a high concentration of surfactant and a separate second concentrate having a high concentration of builder.
  • the first and second concentrates may be incompatible if mixed separately from a wash solution. Incompatibility in this context stems from different pH requirements of the two different concentrates.
  • the first concentrate may generally have an acidic pH of less than about 2 to maintain the solubility of the surfactant system.
  • the pH of the second concentrate is selected to provide complete solubility of the builder and is generally alkaline. Combination of the two concentrates before dilution in the wash solution may result in phase separation of the surfactant system or the builder depending on pH.
  • this system is diluted into a wash solution comprising from about 0.1 wt-% to 0.8 wt-%, preferably from about 0.2 wt-% to 0.3 wt-% of the first concentrate and from about 0.2 to 1.2 wt-%, and preferably from about 0.4 wt-% to 0.8 wt-% of the second concentrate.
  • the ratio of the first concentrate to the second concentrate in the alkaline wash solution generally ranges from about 0.1:0.5 to 0.1: 1.0. and preferably from about 0.1:0.2 to 0.15:0.3.
  • the alkaline wash solution may have a total of from about 0.3 to 2.0 wt-% and preferably from about 0.5 to 1.2 wt-% of both concentrate 1 and concentrate 2.
  • the wash solution comprises at least about 1000 ppm EDTA, at least about 5 ppm of a phosphonate compound, and at least about 100 ppm of a gluconate compound.
  • the washing of PET containers generally takes place over a number of steps.
  • the PET containers are emptied and pre-rinsed, then soaked in the wash solution.
  • the wash solution generally has anywhere from 1.0 wt-% to 5 wt-% and preferably from 1.5 wt-% to 3 wt-% caustic (NaOH).
  • Concentrate 1 and Concentrate 2 into which the PET containers are applied. Washing tends to take place over a time period which ranges from about 7 to 20 minutes.
  • the wash temperature is about 59°C ⁇ 1°C.
  • the containers then pass through a weak caustic stage where water is run into the tank to continue cleaning and begin rinsing by reducing the sodium hydroxide concentration.
  • the caustic concentration may be maintained by a conductivity controller.
  • the containers then pass through at least three rinse stages which sequentially rinse the containers with warm water and cold water. The final rinsing takes place with potable water after which time the containers are turned upright, inspected, and filled.
  • Example 1A Hazing was measured against a scale of 0 for no hazing such as with water and 10 for 2.8% caustic. Examples 1C and 1D, as well as the series of trials run on Example 1A proved these compositions to be very effective in preventing hazing whether used alone or in conjunction with sequestrants.
  • Example 1B Cleaning Time Cleaning Time Example 1A (wt-%) 10 min 20 min 30 min 0.05 1/4 1/4 2/4 0.10 1/4 2/4 2/4 0.15 2/4 3/4 3/4 0.20 2/4 2/4 3/4 0.25 3/4 3/4 3/4 0.30 4/4
  • the wash solution comprised 2.8 wt-% caustic and 0.2 wt-% Example 1A, with varying amounts of Example 1B as indicated below. Data was reported as in Table 5A.
  • Different concentrations of Example 1A and 1B were combined to test cleaning efficacy.
  • Example 1A (wt-%)
  • Example 1B (wt-%) 10 min 20 min 30 min 0.10 1.20 3/4 3/4 3/4 0.15 1.20 3/4 3/4 3/4 0.20 1.20 4/4 0.10 1.80 3/4 3/4 3/4 0.15 1.80 3/4 4/4 0.20 1.80 4/4 0.20 0.7 2/4 2/4 3/4 0.20 0.8 2/4 2/4 3/4 0.20 1.0 4/4 0.30 0.4 2/4 2/4 2/4 0.40 0.4 2/4 2/4 2/4 2/4
  • the cleaning efficacy of wash solutions having set concentrations of Example I A and Example 1B with varied concentrations of caustic was then analyzed.
  • Example 1 A was added at 0.2 wt-% to the wash solution and
  • Example I B was added at 0.8 wt-% to the wash solution.
  • the results are reported below in the same manner as Tables 5A - 5C.
  • Cleaning Time Caustic (wt-%) 10 min 20 min 30 min 1.5 2.4 2.4 3/4 2.0 2/4 2/4 4/4 2.6 3/4 3/4 4/4

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  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
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  • Oil, Petroleum & Natural Gas (AREA)
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  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Detergent Compositions (AREA)
  • Cleaning In General (AREA)
  • Cleaning By Liquid Or Steam (AREA)
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Claims (27)

  1. Verfahren zum Reinigen eines Polyethylenterephthalatbehälters, wobei dieses Verfahren die folgenden Schritte umfasst:
    das Kombinieren eines ersten Konzentrats mit einem zweiten Konzentrat in einer alkalischen Waschlösung, umfassend 1 Gew.% bis 5 Gew.% einer Alkalinitätsquelle und 0,3 bis 2 Gew.% des ersten Konzentrats und des zweiten Konzentrats;
    (a) wobei das erste Konzentrat
    (i) 0,3 bis 25 Gew.% eines nichtionischen Tensids mit einem Trübungspunkt im Bereich von 5°C bis 60°C,
    (ii) 5 bis 30 Gew.% einer Säure
       umfasst;
    (b) und das zweite Konzentrat
    (i) 8 bis 60 Gew.% eines Aufbaustoffs umfasst; und
    das In-Kontakt-Bringen des Behälters mit der alkalischen Waschlösung;
       wobei die Schmutzentfemung unter minimaler Trübung des Behälters durchgeführt wird.
  2. Verfahren nach Anspruch 1, wobei
    das erste Konzentrat
    1 bis 15 Gew.% eines ersten nichtionischen Tensids;
    5 bis 20 Gew.% eines ersten Aufbaustoffs; und
    10 bis 20 Gew.% einer Säure, die dahingehend wirkt, eine phasenstabile Lösung bereitzustellen, umfasst; und
    das zweite Konzentrat
    01. bis 5 Gew.% eines zweiten nichtionischen Tensids; und
    15 bis 45 Gew.% eines zweiten Aufbaustoffs umfasst.
  3. Verfahren nach Anspruch 1, wobei das erste Konzentrat einen ersten Aufbaustoff umfasst, wobei der Aufbaustoff des zweiten Konzentrats ein zweiter Aufbaustoff ist.
  4. Verfahren nach Anspruch 1, wobei das zweite Konzentrat weiters ein Tensid umfasst.
  5. Verfahren nach Anspruch 1 oder 2, wobei die Konzentration des ersten, zur Waschlösung hinzugefügten Konzentrats von 0,1 Gew.% bis 0,8 Gew.% der Waschlösung reicht.
  6. Verfahren nach Anspruch 5, wobei das Verhältnis zwischen erstem Konzentrat und zweitem Konzentrat in der Waschlösung von 0,1:0,5 bis 0,1:1,0 reicht.
  7. Verfahren nach Anspruch 1 oder 2, wobei die Waschlösung 1,5 Gew.% bis 3 Gew.% einer ätzenden Alkalinitätsquelle umfasst.
  8. Verfahren nach Anspruch 1 oder 2, wobei das erste Konzentrat weiters einen Haftvermittler umfasst.
  9. Verfahren nach Anspruch 8, wobei der Hanvermittler ausgewählt ist aus der Gruppe, bestehend aus Natriumxylolsulfonat, 2-Ethylhexylsulfat, Natriumcumolsulfonat, Natriumtoluolsulfonat, Natriumalkylnaphthalinsulfonat, Natriumoctansulfonat, einem verzweigten Alkyldiphenyloxiddisulfonat, einem linearen Alkyldiphenyloxiddisulfonat und Mischungen davon.
  10. Verfahren nach Anspruch 8, wobei der Haftvermittler eine polyfunktionelle Hydroxyverbindung umfasst.
  11. Verfahren nach Anspruch 8, wobei der Haftvermittler einen Phosphatester umfasst.
  12. Verfahren nach Anspruch 8, wobei die Waschlösung 6 bis 500 ppm Tensid, 480 bis 4000 ppm Aufbaustoff und 20 bis 800 ppm Haftvermittler umfasst.
  13. Verfahren nach Anspruch 1 oder 2, wobei die Waschlösung eine Temperatur von 50 bis 60°C hat.
  14. Verfahren nach Anspruch 1 oder 2, wobei die Waschlösung eine Temperatur unter 60°C hat.
  15. Verfahren nach Anspruch 1, wobei das nichtionische Tensid ausgewählt ist aus der Gruppe, bestehend aus einem Ethylenoxid-Propylenoxid-Blockcopolymer, einem Alkylethoxylat, einem Alkylethoxylat-Propoxylat, einem Alkylethoxylat-Butoxylat und Mischungen davon.
  16. Verfahren nach Anspruch 2 oder 3, wobei der erste Aufbaustoff ausgewählt ist aus der Gruppe, bestehend aus Phosphonaten, Phosphinaten, Acrylaten, Polycarboxylaten und Mischungen davon.
  17. Verfahren nach Anspruch 2 oder 3, wobei der zweite Aufbaustoff einen Chelatbildner umfasst, welcher Ethylendiamintetraessigsäure oder ein Salz davon umfasst.
  18. Verfahren nach Anspruch 1 oder 2, wobei das zweite Konzentrat mit dem ersten Konzentrat nicht kompatibel ist.
  19. Verfahren nach Anspruch 18, wobei der zweite Aufbaustoff ein Alkylenpolyaminpolyessigsäuresalz umfasst.
  20. Verfahren nach Anspruch 1 oder 2, wobei die Säure ausgewählt ist aus der Gruppe, bestehend aus einer organischen Säure, einer anorganischen Säure und Mischungen davon.
  21. Verfahren nach Anspruch 18, wobei die Säure eine organische Säure, ausgewählt aus der Gruppe, bestehend aus Zitronensäure, Essigsäure, Hydroxyessigsäure, Gluconsäure, Glucohaptansäure, Milchsäure und Mischungen davon, umfasst.
  22. Alkalische Waschlösung zum Reinigen von Polyethylenterephthalatflaschen, wobei die Waschlösung eine Mischung aus:
    1 bis 5 Gew.% einer Alkalinitätsquelle;
    480 bis 4000 ppm eines Aufbaustoffs;
    6 bis 500 ppm eines nichtionischen Tensids mit einem Trübungspunkt im Bereich von
    5°C bis 60°C, und
    20 bis 800 ppm eines Haftvermittlers
    umfasst.
  23. Alkalische Waschlösung nach Anspruch 22, wobei das nichtionische Tensid eines umfasst, welches ausgewählt ist aus der Gruppe, bestehend aus einem Ethylenoxid-Propylenoxid-Blockcopolymer, einem Alkylethoxylat, einem Alkylethoxylat-Propoxylat, einem Alkylethoxylat-Butoxylat und Mischungen davon.
  24. Alkalische Waschlösung nach Anspruch 22, wobei die Waschlösung 1,5 Gew.% bis 3 Gew.% einer ätzenden Alkalinitätsquelle umfasst.
  25. Alkalische Waschlösung nach Anspruch 22, wobei der Haftvermittler ausgewählt ist aus der Gruppe, bestehend aus Natriumxylolsulfonat, 2-Ethylhexylsulfat, Natriumcumolsulfonat, Natriumtoluolsulfonat, Natriumalkylnaphthalinsuifonat, Natriumoctansulfonat, einem verzweigten Alkyldiphenyloxiddisulfonat einem linearen Alkyldiphenyloxiddisulfonat und Mischungen davon.
  26. Alkalische Waschlösung nach Anspruch 22, wobei der Haftvermittler eine polyfunktionelle Hydroxyverbindung umfasst.
  27. Alkalische Waschlösung nach Anspruch 22, wobei der Haftvermittler einen Phosphatester umfasst.
EP96941351A 1996-11-15 1996-11-15 Reinigungsverfahren für polyethlyen-terephtalat-behälter Expired - Lifetime EP0946701B1 (de)

Applications Claiming Priority (1)

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PCT/US1996/018261 WO1998022566A1 (en) 1996-11-15 1996-11-15 Cleaning method for polyethylene terephtalate containers

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1341882A4 (de) * 2000-11-24 2004-09-01 Henkel Kgaa Auf tensidmischungen basierende reinigungsmittel mit reduzierter streifenbildung
US7148188B2 (en) 2002-09-18 2006-12-12 Ecolab Inc. Bottlewash additive comprising an alkyl diphenylene oxide disulfonate
JP4621877B2 (ja) * 2006-03-17 2011-01-26 岡山県 プラスチック製ボトルの洗浄方法
JP5907982B2 (ja) * 2010-11-11 2016-04-26 エコラボ インコーポレイティド 瓶用クリーニングおよびラベル除去のための方法
DE102010063743A1 (de) 2010-12-21 2012-06-21 Henkel Ag & Co. Kgaa Flüssige Tensidzubereitung enthaltend Lipase und Phosphonat

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4102799A (en) * 1974-08-29 1978-07-25 Colgate-Palmolive Company Automatic dishwasher detergent with improved effects on overglaze
ZA827598B (en) * 1981-11-24 1983-09-28 Alethea Rosalind Melanie Hall Cleaning method
US4505836A (en) * 1982-07-28 1985-03-19 Tp Industrial, Inc. Plastic bottle cleaner composition and method
US4434069A (en) * 1982-07-28 1984-02-28 Purex Corporation Plastic bottle cleaner
US5223162A (en) * 1988-07-14 1993-06-29 Diversey Corporation Washing composition for inhibiting stress cracking in poly(alkylene terephthalate) articles and methods of use therefor
ATE140261T1 (de) * 1990-12-14 1996-07-15 Henkel Corp Im wesentlichen phosphatfreies, schwach saueres reinigungsmittel für kunststoffartikel
US5330581A (en) * 1992-08-26 1994-07-19 Nalco Chemical Company Use of caustic and surfactant as a cleaner for recycled plastic
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
JP4361605B2 (ja) * 1995-11-17 2009-11-11 ジョンソンディバーシー・インコーポレーテッド 清浄処方物、清浄処方物用添加剤並びにかかる処方物を用いてボトルを清浄にする方法

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TW546379B (en) 2003-08-11
AU734264B2 (en) 2001-06-07
JP2001504535A (ja) 2001-04-03
AU1052197A (en) 1998-06-10
ZA975113B (en) 1998-12-10
DE69632836D1 (de) 2004-08-05
CA2271819C (en) 2007-01-30
CA2271819A1 (en) 1998-05-28
DE69632836T2 (de) 2005-07-21
JP4163754B2 (ja) 2008-10-08
EP0946701A1 (de) 1999-10-06
EP0946701A4 (de) 2000-03-08

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