EP0946701B1 - Procede de nettoyage de reservoirs en polyethylene terephthalate - Google Patents

Procede de nettoyage de reservoirs en polyethylene terephthalate 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
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EP96941351A
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German (de)
English (en)
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EP0946701A4 (fr
EP0946701A1 (fr
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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Claims (27)

  1. Procédé de nettoyage d'un conteneur de polyéthylène téréphtalate, ledit procédé comprenant les étapes consistant à :
    combiner un premier concentré avec un second concentré dans une solution de lavage alcaline comprenant de 1% en poids à 5% en poids d'une source d'alcalinité et 0,3 à 2% en poids dudit premier concentré et dudit second concentré ;
    (a) ledit premier concentré comprenant :
    (i) 0,3 à 25% en poids d'un tensioactif non ionique ayant un point de trouble dans une gamme de 5°C à 60°C ;
    (ii) 5 à 30% en poids d'un acide ;
    (b) ledit second concentré comprenant :
    (i) 8 à 60% en poids d'un adjuvant de détergence ; et
    la mise en contact dudit récipient avec ladite solution de lavage alcaline;
       dans lequel l'enlèvement de saleté se fait avec un minimum de turbidité du récipient.
  2. Procédé selon la revendication 1 dans lequel :
    le premier concentré comprend :
    1 à 15% en poids d'un premier tensioactif non ionique
    5 à 20% en poids d'un premier adjuvant de détergence et
    10 à 20% en poids d'un acide, efficace pour fournir une solution stable en phase ; et le second concentré comprend :
    01 à 5% en poids d'un second tensioactif non ionique et
    15 à 45% en poids d'un second adjuvant de détergence.
  3. Procédé selon la revendication 1, dans lequel ledit premier concentré comprend un premier adjuvant de détergence, l'adjuvant dudit second concentré étant un second adjuvant de détergence.
  4. Procédé selon la revendication 1, dans lequel ledit second concentré comprend en outre un tensioactif.
  5. Procédé selon les revendications 1 ou 2 dans lequel la concentration du premier concentré ajouté à ladite solution de lavage va de 0,1% en poids à 0,8% en poids de la solution de lavage.
  6. Procédé selon la revendication 5, dans lequel le rapport du premier concentré au second concentré dans la solution de lavage va de 0,1 :0,5 à 0,1 :1,0.
  7. Procédé selon les revendications 1 ou 2, dans lequel la solution de lavage comprend 1,5% en poids à 3% en poids d'une source caustique d'alcalinité.
  8. Procédé selon les revendications 1 ou 2, dans lequel ledit premier concentré comprend en outre un coupleur.
  9. Procédé selon la revendication 8 dans lequel ledit coupleur est choisi dans le groupe consistant en sulfonate de xylène de sodium, 2-éthyl-hexyl sulfate, sulfonate de cumène de sodium, sulfonate de toluène de sodium, sulfonate de naphtalène alkyle sodium, sulfonate d'octane de sodium, un disulfonate d'oxyde de diphényle alkyle ramifié, un disulfonate d'oxyde de diphényle alkyle linéaire et des mélanges de ceux-ci.
  10. Procédé selon la revendication 8, dans lequel ledit coupleur comprend un composé hydroxy polyfonctionnel.
  11. Procédé selon la revendication 8, dans lequel ledit coupleur comprend un ester de phosphate.
  12. Procédé selon la revendication 8, dans lequel ladite solution de lavage comprend de 6 à 500 ppm de tensioactif, de 480 à 4000 ppm d'adjuvant et de 20 à 800 ppm de coupleur.
  13. Procédé selon les revendications 1 ou 2, dans lequel ladite solution de lavage a une température de 50 à 60°C.
  14. Procédé selon les revendications 1 ou 2, dans lequel ladite solution de lavage a une température inférieure à 60°C.
  15. Procédé selon la revendication 1, dans lequel ledit tensioactif non ionique est choisi dans le groupe consistant en un copolymère bloc d'oxyde d'éthylène-oxyde de propylène, un éthoxylate d'alkyle, un éthoxylate-propoxylate d'alkyle, un éthoxylate-butoxylate d'alkyle et des mélanges de ceux-ci.
  16. Procédé selon les revendications 2 ou 3, dans lequel ledit premier adjuvant de détergence est choisi dans le groupe consistant en phosphonates, en phosphinates, en acrylates, en polycarboxylates, et en mélanges de ceux-ci.
  17. Procédé selon les revendications 2 ou 3, dans lequel ledit second adjuvant de détergence comprend un agent chélatant comprenant de l'acide tétraacétique d'éthylène diamine ou un de ses sels.
  18. Procédé selon les revendications 1 ou 2, dans lequel ledit second concentré n'est pas compatible avec ledit premier concentré.
  19. Procédé selon la revendication 18, dans lequel le second adjuvant comprend un sel d'acide polyacétique de polyamine d'alcylène.
  20. Procédé selon les revendications 1 ou 2, dans lequel ledit acide est choisi dans le groupe constitué d'un acide organique, d'un acide inorganique et de mélanges de ceux-ci.
  21. Procédé selon la revendication 18, dans lequel ledit acide comprend un acide organique choisi dans le groupe consistant en acide citrique, acide acétique, acide acétique hydroxy, acide gluconique, acide glucoheptanoïque, acide lactique, et des mélanges de ceux-ci.
  22. Solution de lavage alcaline pour nettoyer des bouteilles de polyéthylène téréphtalate, ladite solution de lavage comprenant un mélange de :
    1 à 5% en poids d'une source d'alcalinité
    480 à 4000 ppm d'un adjuvant de détergence
    6 à 500 ppm d'un tensioactif non ionique ayant une gamme de point de trouble de 5°C à 60°C et
    20 à 800 ppm d'un coupleur.
  23. Solution de lavage alcaline selon la revendication 22, dans laquelle le tensioactif non ionique comprend un élément choisi dans le groupe consistant en un copolymère bloc d'oxyde d'éthylène - oxyde de propylène, un éthoxylate d'alkyle, un éthoxylate-propoxylate d'alkyle, un éthoxylate-butoxylate d'alkyle, et des mélanges de ceux-ci.
  24. Solution de lavage alcaline selon la revendication 22, dans laquelle la solution de lavage comprend 1,5% en poids à 3% en poids d'une source caustique d'alcalinité.
  25. Solution de lavage alcaline selon la revendication 22, dans laquelle ledit coupleur est choisi dans le groupe consistant en sulfonate de xylène de sodium, 2-éthyl hexyl sulfate, sulfonate de cumène de sodium, sulfonate de toluène de sodium, sulfonate de naphtalène d'alkyle de sodium, sulfonate d'octane de sodium, un disulfonate d'oxyde diphényle alkyle ramifié, un disulfonate d'oxyde de diphényle d'alkyle linéaire et des mélanges de ceux-ci.
  26. Solution de lavage alcaline selon la revendication 22, dans laquelle ledit coupleur comprend un composé hydroxy polyfonctionnel.
  27. Solution de lavage alcaline selon la revendication 22, dans laquelle ledit coupleur comprend un ester de phosphate.
EP96941351A 1996-11-15 1996-11-15 Procede de nettoyage de reservoirs en polyethylene terephthalate Expired - Lifetime EP0946701B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1996/018261 WO1998022566A1 (fr) 1996-11-15 1996-11-15 Procede de nettoyage de reservoirs en polyethylene terephthalate

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EP0946701A1 EP0946701A1 (fr) 1999-10-06
EP0946701A4 EP0946701A4 (fr) 2000-03-08
EP0946701B1 true EP0946701B1 (fr) 2004-06-30

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JP (1) JP4163754B2 (fr)
AU (1) AU734264B2 (fr)
CA (1) CA2271819C (fr)
DE (1) DE69632836T2 (fr)
TW (1) TW546379B (fr)
WO (1) WO1998022566A1 (fr)
ZA (1) ZA975113B (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002055641A1 (fr) * 2000-11-24 2002-07-18 The Clorox Company Compositions de lavage a tensioactifs melanges a effets de trainees reduits
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
CN107474971B (zh) * 2010-11-11 2020-10-30 艺康股份有限公司 用于清洁瓶子和除去瓶子上标签的方法
DE102010063743A1 (de) 2010-12-21 2012-06-21 Henkel Ag & Co. Kgaa Flüssige Tensidzubereitung enthaltend Lipase und Phosphonat

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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
AU653570B2 (en) * 1990-12-14 1994-10-06 Henkel Corporation Substantially phosphate free mildly acidic cleaner for plastics
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
ES2208765T3 (es) * 1995-11-17 2004-06-16 Johnsondiversey, Inc. Uso de una formulacion limpiadora y procedimiento para limpiar botellas.

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JP2001504535A (ja) 2001-04-03
CA2271819C (fr) 2007-01-30
DE69632836D1 (de) 2004-08-05
AU734264B2 (en) 2001-06-07
ZA975113B (en) 1998-12-10
EP0946701A4 (fr) 2000-03-08
DE69632836T2 (de) 2005-07-21
JP4163754B2 (ja) 2008-10-08
CA2271819A1 (fr) 1998-05-28
EP0946701A1 (fr) 1999-10-06
WO1998022566A1 (fr) 1998-05-28
TW546379B (en) 2003-08-11
AU1052197A (en) 1998-06-10

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