WO2000043318A2 - Colored acidic rinse aid product having an ultraviolet light resistant bottle - Google Patents
Colored acidic rinse aid product having an ultraviolet light resistant bottle Download PDFInfo
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- WO2000043318A2 WO2000043318A2 PCT/US2000/001384 US0001384W WO0043318A2 WO 2000043318 A2 WO2000043318 A2 WO 2000043318A2 US 0001384 W US0001384 W US 0001384W WO 0043318 A2 WO0043318 A2 WO 0043318A2
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- rinse aid
- aid composition
- colored acidic
- container
- acidic rinse
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Classifications
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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
- C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
- C11D17/04—Detergent materials or soaps characterised by their shape or physical properties combined with or containing other objects
- C11D17/041—Compositions releasably affixed on a substrate or incorporated into a dispensing means
- C11D17/046—Insoluble free body dispenser
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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
- C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
- C11D17/04—Detergent materials or soaps characterised by their shape or physical properties combined with or containing other objects
- C11D17/041—Compositions releasably affixed on a substrate or incorporated into a dispensing means
-
- 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
- C11D3/2086—Hydroxy 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
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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
- C11D3/37—Polymers
- C11D3/3746—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C11D3/3757—(Co)polymerised carboxylic acids, -anhydrides, -esters in solid and liquid compositions
- C11D3/3765—(Co)polymerised carboxylic acids, -anhydrides, -esters in solid and liquid compositions in liquid compositions
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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
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/38—Cationic compounds
- C11D1/52—Carboxylic amides, alkylolamides or imides or their condensation products with alkylene oxides
- C11D1/521—Carboxylic amides (R1-CO-NR2R3), where R1, R2 and R3 are alkyl or alkenyl groups
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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
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/38—Cationic compounds
- C11D1/52—Carboxylic amides, alkylolamides or imides or their condensation products with alkylene oxides
- C11D1/523—Carboxylic alkylolamides, or dialkylolamides, or hydroxycarboxylic amides (R1-CO-NR2R3), where R1, R2 or R3 contain one hydroxy group per alkyl group
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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
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/38—Cationic compounds
- C11D1/52—Carboxylic amides, alkylolamides or imides or their condensation products with alkylene oxides
- C11D1/525—Carboxylic amides (R1-CO-NR2R3), where R1, R2 or R3 contain two or more hydroxy groups per alkyl group, e.g. R3 being a reducing sugar rest
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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
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/66—Non-ionic compounds
- C11D1/662—Carbohydrates or derivatives
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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
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/66—Non-ionic compounds
- C11D1/72—Ethers of polyoxyalkylene glycols
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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
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/66—Non-ionic compounds
- C11D1/722—Ethers of polyoxyalkylene glycols having mixed oxyalkylene groups; Polyalkoxylated fatty alcohols or polyalkoxylated alkylaryl alcohols with mixed oxyalkylele groups
Definitions
- the present invention relates to a colored acidic rinse aid product having a colored acidic rinse aid composition enclosed in an ultraviolet light resistant container. More particularly, the invention is directed to a colored acidic rinse aid product for automatic dishwashing having a colored acidic rinse aid composition enclosed in an ultraviolet light resistant container, wherein the container has an effective amount of an ultraviolet light blocking agent.
- rinse aids are aqueous solutions containing a low foam nonionic surfactant.
- the rinse aid is injected into the final fresh water rinse at a concentration of about 100 to about 500 ppm. The surfactant in the rinse water lowers the surface tension of the rinse water and improves the wetting action of the rinse water.
- aqueous rinse aid containing a low foam nonionic surfactant and a low molecular weight neutralized, partially neutralized, or non-neutralized polyacrylate polymer without the use of a compatibilizing high molecular weight polymer or a high cloud point co-surfactant, thus providing an acidic, stable aqueous rinse aid dispersion which reduces spotting and filming while improving sheeting action and drainage.
- the product comprises an enclosed container in which a colored acidic rinse aid composition is contained.
- the container has a recloseable opening through which the colored acidic rinse aid composition can be dispensed.
- the container has walls containing an effective amount of an ultraviolet light blocker to retard at least 50% of ultraviolet light having a wavelength less than about 400 nanometers, from the colored acidic rinse aid composition in the container.
- the colored acidic rinse aid composition includes: a low foaming nonionic surfactant present in a range of from about 2% to about 80% by weight of the rinse aid composition.
- the composition also includes a hydrotrope present in a range of from about 0.5% to about 20% by weight of the rinse aid composition.
- the composition further includes a polyacrylate polymer present in a range of from about 0.1% to about 15% by weight of the rinse aid composition.
- the polymer has a weight average molecular weight in a range of from about 1000 to about 50,000.
- the product comprises an enclosed container in which a colored acidic rinse aid composition is contained.
- the container has a recloseable opening through which the colored acidic rinse aid composition can be dispensed.
- the container has walls containing an effective amount of an ultraviolet light blocker to retard desirably at least 50% of ultraviolet light having a wavelength less than about 400 nanometers, from the colored acidic rinse aid composition in the container.
- the container walls contain an effective amount of an ultraviolet light blocker to retard at least 75% of ultraviolet light having a wavelength less than about 375 nanometers from the colored acidic rinse aid composition in the container.
- UV light having a wavelength less than 400 nanometers so as to have a dye discoloration no greater than about 33% when the rinse aid is exposed to ambient light for a period of 6 months, or UV light for a period of 2 days.
- the colored acidic rinse aid composition desirably exhibits no more than about a 33% dye discoloration when exposed to one of ambient light for 6 months, or ultraviolet light for 2 days, or both, and preferably the colored acidic rinse aid product exhibits no more than about a 30% dye discoloration when exposed to ambient light for 6 months, and no more than about a 30% dye discoloration when exposed to UV light for 2 days.
- the container blocks, retards, or otherwise inhibits ultraviolet light such that the uniquely formulated colored acidic rinse aid composition retains the target color.
- the ultraviolet light resistant container enhances the dye stability.
- the container which can be a bottle made of high density polyethylene or the like, includes a UV light blocker as described in detail hereinafter.
- UV blocker means any material which is capable of blocking, reflecting, inhibiting a sufficient amount UV light to protect the detergent composition from deleterious effects of the UV light. The amount of UV light "blocking" will thus vary with the formulation of the dishwashing detergent composition in the container.
- the UV light blocker is preferably present in the container, or alternatively in the detergent composition itself, at an "effective amount" which will vary dramatically depending upon the size of the container. Typically amounts, which are based on the tear weight of the container, include from about 0.0001% to about 2% by weight, more preferably from about 0.0001% to about 0.8%, and most preferably from about 0.01% to about 0.5%. It is essential that the UV light blocker be adequately dispersed in the container walls such that UV light cannot substantially penetrate the container and contact the rinse aid composition. It is essential that the UV light blocker be so adequately dispersed, so that desirably, at least 50% of the ultraviolet light having a wavelength less than 400 nanometers is blocked and does not penetrate the container walls and contact the rinse aid.
- a colorant such as a blue tint, is also added to the container material, to enhance the aesthetic appearance of the container.
- the container walls contain an effective amount of an ultraviolet light blocker to retard at least 75% of ultraviolet light having a wavelength less than about 375 nanometers from the colored acidic rinse aid composition in the container.
- the container walls contain an effective amount of an ultraviolet light blocker to retard at least 90% of ultraviolet light having a wavelength less than about 375 nanometers from the colored acidic rinse aid composition in the container. It is necessary to block out the aforementioned amounts of ultraviolet light in order to maintain the color stability of the dye colorant, especially when the colored acidic rinse aid composition is formulated without using a chelant in an amount of at least 1 ppm by weight, as an additional dye stabilizing ingredient.
- the rinse aid composition is also formulated with the chelant in an amount of at least 1 ppm by weight to additionally retard the discoloration of the dye when exposed to ambient and ultraviolet light
- UV light blocker which can be any material which fits the definition noted above.
- Exemplary UV light blockers suitable for use herein include those materials selected from the group consisting of benzotriazoles, orthohydroxy benzophenones, titanium dioxide, and mixtures thereof.
- the preferred UN light blocker are substituted benzotriazoles.
- Specific substituted benzotriazoles for use herein are commercially available from Ciba Geigy under the tradename Tinuvin.
- Tinuvin 326 Ciba Geigy
- the most particularly preferred UV blockers are Eastman UV#9921G0031 and Colormatrix UV#80-224-6. Desirably, the Eastman UV#9921G0031 UV blocker is added in an amount ranging from 0.2% to 2.0% by weight of the polymer, for example, high density polyethylene, used for making the bottle.
- the colored acidic rinse aid composition includes: a low foaming nonionic surfactant present in a range of from about 2% to about 80% by weight of the rinse aid composition.
- the composition also includes a hydrotrope present in a range of from about 0.5% to about 20% by weight of the rinse aid composition.
- the composition further includes a polyacrylate polymer present in a range of from about 0.1 % to about 15% by weight of the rinse aid composition.
- the polymer has a weight average molecular weight in a range of from about 1000 to about 50,000.
- the composition further includes a chelant.
- the chelant is desirably present in an amount of at least 1 ppm, preferably at least 50 ppm, more preferably at least 100 ppm and most preferably at least 150 ppm by weight of the rinse aid composition.
- the acidic rinse aid composition includes chelants selected from the group consisting of amino carboxylates, amino phosphonates, polyfunctionally- substituted aromatic chelants, and mixtures thereof.
- Other useful chelants include iron and/or manganese chelants.
- Amino carboxylates useful as optional chelants include ethylenediaminetetracetates, N-hydroxyethylethylenediaminetriacetates, nitrilo-triacetates, ethylenediamine tetraproprionates, triethylenetetra-amine-hexacetates, diethylene- triaminepentaacetates, and ethanoldiglycines, alkali metal, ammonium, and substituted ammonium salts therein and mixtures therein.
- Polyfunctionally-substituted aromatic chelants include dihydroxydisulfobenzenes such as l,2-dihydroxy-3,5-disulfobenzene, and ethylenediamine disuccinate ("EDDS")-
- the chelant is selected from the group consisting of ethylene diamine tetra acetic acid carboxylate, diethylene triamine penta acetic acid carboxylate , and mixtures thereof.
- the chelants are selected from polyphosphonate, ethylene diamine tetra acetic acid carboxylate (EDTA) and diethylene triamine penta acetic acid carboxylate (DTPA).
- the chelant is ethylene triamine penta phosphoric acid.
- the dye is selected from the group consisting of Pontamine Blue (Copper Phthalocyanine Dyestuff), and Liquitant Patent Blue (polymeric colorant) and FD&C Blue #1 (having the molecular formula C37H3 4 N 2 Na2 ⁇ 9 S 3 ), and mixtures thereof.
- the dye has a color selected from the group consisting of blue, green, or mixtures thereof. It has been found that the blue and green dyes typically used in rinse aid formulations, such as the FD&C #1, are unstable to UV light in acidic conditions unless the rinse aid composition is formulated with a chelant according to the present invention.
- the so-called “acid stable” dyes such as Acid Blue 80
- the dyes are added in an amount in a range of from about 0.25% of a 1% solution in water to about 0.5% of a 1% solution in water.
- the dye is selected from the group consisting of copper phthalocyanine dyestuff, FD&C #1 colors, polymeric colorants, and mixtures thereof
- the chelant is selected from the group consisting of amino carboxylates, amino phosphonates, polyfunctionally-substituted aromatic chelants, and mixtures thereof It has been found that these "dye-chelant" systems, optimally yield the most effective dye color stability to ambient and UV light radiation, when such dyes are used in acidic rinse aids.
- the most preferred chelants are selected from polyphosphonate ethylene diamine tetra acetic acid carboxylate (EDTA) and diethylene triamine penta acetic acid carboxylate (DTPA) in combination with the most preferred dyes selected from blue dyes such as Pontamine Blue (Copper Phthalocyanine Dyestuff), and Liquitant Patent Blue (polymeric colorant) and FD&C Blue #1 (for example, an FD&C Blue #1 having the molecular formula C 37 H 3 N 2 Na 2 ⁇ 9 S 3 ).
- blue dyes such as Pontamine Blue (Copper Phthalocyanine Dyestuff), and Liquitant Patent Blue (polymeric colorant) and FD&C Blue #1 (for example, an FD&C Blue #1 having the molecular formula C 37 H 3 N 2 Na 2 ⁇ 9 S 3 ).
- the dye stability is further enhanced in the presence of carboxylic acids.
- carboxylic acids Especially preferred are polycarboxylic acids, such as Sokolan PA13PN manufactured by BASF, Acusol 480, and Acusol 480N, both manufactured by Rohm & Haas. These polycarboxylic acids provide multiple benefits, as they help stabilize the dye and deliver filming performance benefits in the rinse cycle of automatic dishwashing.
- the polycarboxylic acid is present in an amount in a range of from about 0.25% to about 10% by weight of the acidic rinse aid composition, and preferably, in an amount in a range of from about 1% to about 6% by weight.
- the nonionic surfactants useful in the acidic rinse aid dispersion may be any known low foaming nonionic surfactant used in machine dishwashing applications.
- suitable nonionic surfactants include the following commercially available materials: Triton RTM CF-10 (an alkylaryl polyether) and Triton DF-16 (a modified polyalkoxylated alcohol) manufactured by Rohm and Haas Company; Plurafac LF404TM, Plurafac LF400TM (mixed linear alcohol alkoxylates), and Pluronic RTM L-62 (a polyoxyethylene-polyoxypropylene block copolymer), all manufactured by BASF Wyandotte Corporation, and BASF RA30 surfactant, manufactured by BASF Corporation.
- the rinse aid formulation of the invention may contain one or a mixture of such low foaming nonionic surfactants.
- nonionic surfactants useful for detersive purposes can be included in the rinse aid compositions.
- exemplary, non-limiting classes of useful nonionic surfactants are listed below.
- Polyhydroxy fatty acid amides suitable for use herein are those having the structural formula R 2 CONR 1 Z wherein: Rj is H, -C 4 hydrocarbyl, 2-hydroxy ethyl, 2-hydroxy propyl, or a mixture thereof, preferable Cj-C alkyl, more preferably or C 2 alkyl, most preferably Ci alkyl (i.e., methyl); and R 2 is a C 5 -C 3 1 hydrocarbyl, preferably straight-chain C 5 -C !9 alkyl or alkenyl, more preferably straight-chain C9-C 17 alkyl or alkenyl, most preferably straight-chain Cn-C ⁇ alkyl or alkenyl, or mixture thereof; and Z is a polyhydroxyhydrocarbyl having a linear hydrocarbyl chain with at least 3 hydroxyls directly connected to the chain, or an alkoxylated derivative (preferably ethoxylated or propoxylated) thereof. Z preferably will be derived from a reducing sugar
- polyethylene, polypropylene, and polybutylene oxide condensates of alkyl phenols are suitable for use herein.
- the polyethylene oxide condensates are preferred.
- These compounds include the condensation products of alkyl phenols having an alkyl group containing from about 6 to about 18 carbon atoms in either a straight chain or branched chain configuration with the alkylene oxide, (iii) Nonionic ethoxylated alcohol surfactant
- alkyl ethoxylate condensation products of aliphatic alcohols with from about 1 to about 25 moles of ethylene oxide are suitable for use herein.
- the alkyl chain of the aliphatic alcohol can either be straight or branched, primary or secondary, and generally contains from 6 to 22 carbon atoms.
- Particularly preferred are the condensation products of alcohols having an alkyl group containing from 8 to 20 carbon atoms with from about 2 to about 10 moles of ethylene oxide per mole of alcohol.
- the ethoxylated C 6 -C ⁇ 8 fatty alcohols and C 6 -Cj 8 mixed ethoxylated/propoxylated fatty alcohols are highly preferred surfactants for use herein, particularly where water soluble.
- the ethoxylated fatty alcohols are the Go - 8 ethoxylated fatty alcohols with a degree of ethoxylation of from 3 to 50, most preferably these are the C 12 -Cj 8 ethoxylated fatty alcohols with a degree of ethoxylation from 3 to 40.
- the mixed ethoxylated/propoxylated fatty alcohols have an alkyl chain length of from 10 to 18 carbon atoms, a degree of ethoxylation of from 3 to 30 and a degree of propoxylation of from 1 to 10.
- the condensation products of ethylene oxide with a hydrophobic base formed by the condensation of propylene oxide with propylene glycol are suitable for use herein.
- the hydrophobic portion of these compounds preferably has a molecular weight of from about 1500 to about 1800 and exhibits water insolubility.
- Examples of compounds of this type include certain of the commercially-available PluronicTM. surfactants, marketed by BASF.
- condensation products of ethylene oxide with the product resulting from the reaction of propylene oxide and ethylenediamine are suitable for use herein.
- the hydrophobic moiety of these products consists of the reaction product of ethylenediamine and excess propylene oxide, and generally has a molecular weight of from about 2500 to about 3000.
- this type of nonionic surfactant include certain of the commercially available TetronicTM compounds, marketed by BASF.
- alkylpolysaccharides for use herein are disclosed in U.S. Pat. No. 4,565,647, Llenado, issued Jan. 21, 1986, having a hydrophobic group containing from about 6 to about 30 carbon atoms, preferably from about 10 to about 16 carbon atoms and a polysaccharide, e.g., a polyglycoside, hydrophilic group containing from about 1.3 to about 10, preferably from about
- reducing saccharide containing 5 or 6 carbon atoms can be used, e.g., glucose, galactose and galactosyl moieties can be substituted for the glucosyl moieties.
- the hydrophobic group is attached at the 2-, 3-, 4-, etc. positions thus giving a glucose or galactose as opposed to a glucoside or galactoside.
- the intersaccharide bonds can be, e.g., between the one position of the additional saccharide units and the 2-, 3-, 4-, and/or 6- positions on the preceding saccharide units.
- the preferred alkylpolyglycosides have the formula:
- R 2 0(C n H 2n O)t(glycosyl) x
- R 2 is selected from the group consisting of alkyl, alkylphenyl, hydroxyalkyl, hydroxyalkylphenyl, and mixtures thereof in which the alkyl groups contain from 10 to 18, preferably from 12 to 14, carbon atoms; n is 2 or 3, preferably from about 1.3 to about 3, most preferably from about 1.3 to about 2.7.
- the glycosyl is preferably derived from glucose, (viii)
- Nonionic fatty acid amide surfactant Fatty acid amide surfactants suitable for use herein are those having the formula:
- R 6 C— N(R 7 ) 2 wherein R > 6 i ⁇ s an alkyl group containing from 7 to 21, preferably from 9 to 17 carbon atoms and each R >7 i •s selected from the group consisting of hydrogen, C C 4 alkyl, C ⁇ -C 4 hydroxyalkyl, and — (C 2 Ht 0) x H, where x is in the range of from 1 to 3.
- the hydrotrope useful in the present rinse aid dispersion is selected from the group consisting of sodium cumene sulfonate, sodium xylene sulfonate, sodium toluenesulfonate, dioctyl sodium sulfosuccinate, alkyl naphthalene sulfonate and dihexyl sodium sulfosuccinate.
- the hydrotrope is sodium cumene sulfonate.
- the low molecular weight polyacrylate polymer useful in the present acidic rinse aid dispersion is selected from the group consisting of polyacrylate homopolymer, polyacrylate copolymer, polyacrylate terpolymer, and mixtures thereof.
- the polyacrylate polymer is a partially neutralized or non-neutralized polyacrylate polymer having a pH in a range of from about 2.0 to about 4.0.
- the polyacrylate polymer is desirably at least about 75% non-neutralized.
- the polyacrylate polymer is non-neutralized.
- a neutralized polyacrylate polymer, which is more than 25% neutralized may also be used, but an acid must be added in an amount sufficient to bring the pH value of the resultant rinse aid dispersion within a range of from about 2 to about 6.
- the polyacrylate polymer is a homopolymer of acrylic or methacrylic acid, or a copolymer formed from at least about 50 weight percent acrylic acid.
- the polyacrylate polymer is a low molecular weight polymer or its alkali metal or ammonium salt, having a weight average molecular weight ranging from about 1,000 to about 40,000. Acid
- any acid may be used although organic acids are more desirable and the preferred organic acid is citric acid.
- the stable rinse aid dispersion does not phase separate upon storage for a reasonable time or under actual use conditions and permits each component to effectively reduce spotting and filming and improve sheeting action without interfering with the foaming and defoaming action of the surfactant.
- the rinse aid formulation of the invention is an aqueous dispersion at a pH of from about 2 to about 6.
- the pH ranges from about 3 to about 5.
- the rinse aid dispersion of the present invention is preferably prepared by stirring the desired amount of the surfactant into an aqueous solution of the low molecular weight non- neutralized or only partially neutralized (no more than 25% neutralized) poly aery lie acid followed by the gradual addition of the hydrotrope and if necessary, citric acid to bring the dispersion to within the desired pH range.
- the formulation may also contain other additives including sequestants such as NTA, EDTA, or sodium citrate and water miscible solvents such as ethanol, isopropanol and propylene glycol.
- sequestants such as NTA, EDTA, or sodium citrate
- water miscible solvents such as ethanol, isopropanol and propylene glycol.
- Ethanol is the preferred solvent, present desirably in a range of from about 0.1% to about 10% by weight of the rinse aid dispersion and preferably in a range of from about 2% to about 8% by weight.
- the hydrotrope is selected from the group consisting of sodium cumene sulfonate, sodium xylene sulfonate, sodium toluenesulfonate, dioctyl sodium sulfosuccinate, alkyl naphthalene sulfonate and dihexyl sodium sulfosuccinate.
- the hydrotrope is sodium cumene sulfonate
- the partially-neutralized polyacrylate polymer is a polyacrylate copolymer which is about 20% neutralized.
- the stable aqueous rinse aid dispersion is essentially free of a high molecular weight compatibilizing polymer and is also free of an additional nonionic surfactant having a cloud point of at least 70 degrees C.
- a rinse aid dispersion according to the present invention is made as follows, from the following composition, by weight percent: Low foam nonionic surfactant 35.0%
- This dye has ambient and UV light radiation stability and its color is essentially unchanged after exposure to UV radiation for 1-2 days. Specifically, the rinse aid product exhibits no more than about a 33% dye discoloration when exposed to one of ambient light for 6 months, or ultraviolet light for 2 days.
- a rinse aid dispersion according to the present invention is made as follows, from the following composition, by weight percent: Low foam nonionic surfactant 20.0%
- This dye has ambient and UV light radiation stability and its color is unchanged after exposure to UV radiation for 1-2 days.
- This dye has ambient and UV light radiation stability and its color is unchanged after exposure to UV radiation for 1-2 days.
- This dye has ambient and UV light radiation stability and its color is unchanged after exposure to UV radiation for 1-2 days.
- the above rinse aid formulations are prepared by the following procedure: appropriate amounts of: a low foaming nonionic surfactant (Plurafac LF 400TM), a 45% active sodium cumene sulfonate hydrotrope (45% active SCS), a 50% active polyacrylate copolymer (Acusol 480TM, made by Rohm & Haas), a 50% active citric acid, ethanol and deionized water are added to a beaker and stirred sequentially. Also added is a chelant (polyphosphonate) in an amount of 0.05 weight % (500 ppm by weight) and a color dye as indicated.
- the resulting mixture obtained is a blue or green colored, single-phase acidic dispersion and is stable, with no phase separation occurring after the resulting mixture is kept undisturbed in a closed container for a period of 2 weeks at a temperature of 50 degrees C.
- the container used for enclosing the rinse aid composition preferably has a UV blocker such as one manufactured by Eastman Kodak and sold under the tradename Eastman UN#9921G0031.
- the blocker is used in an amount of about 0.5% by weight. It is determined that the UN blocker blocks at least 75% of the ultraviolet light having a wavelength less than about 375 nanometers.
Abstract
A colored acidic rinse aid product exhibiting improved stability of a dye used therein to ambient and ultra-violet light radiation is provided. The product includes an enclosed container in which a colored acidic rinse aid composition is contained. The container has walls containing an effective amount of an ultraviolet light blocker to retard at least 50 % of ultraviolet light having a wavelength less than about 400 nanometers from the colored acidic rinse aid composition in the container. Optionally, the colored acidric rinse aid composition also includes a chelant as a dye stabilizer, which, in conjunction with it being enclosed in a UV resistant container, further enhances the dye color stability of the colored acidic rinse aid product.
Description
COLORED ACIDIC RINSE AID PRODUCT HAVING AN ULTRAVIOLET LIGHT RESISTANT BOTTLE
TECHNICAL FIELD The present invention relates to a colored acidic rinse aid product having a colored acidic rinse aid composition enclosed in an ultraviolet light resistant container. More particularly, the invention is directed to a colored acidic rinse aid product for automatic dishwashing having a colored acidic rinse aid composition enclosed in an ultraviolet light resistant container, wherein the container has an effective amount of an ultraviolet light blocking agent.
BACKGROUND OF THE INVENTION
The use of rinse aids in commercial and institutional machine dishwashers and also in household automatic dishwashers, is well known. In automatic dishwashing, during the rinse cycle, a final rinse of fresh water serves to displace pre-final rinse water and its attendant detergent and soil residues. Rinse aid formulations are aqueous solutions containing a low foam nonionic surfactant. During the rinse cycle, the rinse aid is injected into the final fresh water rinse at a concentration of about 100 to about 500 ppm. The surfactant in the rinse water lowers the surface tension of the rinse water and improves the wetting action of the rinse water.
The inventors of the present invention have previously discovered that it is possible to formulate an aqueous rinse aid containing a low foam nonionic surfactant and a low molecular weight neutralized, partially neutralized, or non-neutralized polyacrylate polymer without the use of a compatibilizing high molecular weight polymer or a high cloud point co-surfactant, thus providing an acidic, stable aqueous rinse aid dispersion which reduces spotting and filming while improving sheeting action and drainage.
One major problem, however, associated with acidic, stable rinse aid dispersions is that when a dye is added in the composition to impart a pleasing color, especially a typical blue or green dye such as a FD&C #1 color, there is a tendency for such rinse aid compositions to change color upon exposure to ambient and UV light, for example sunlight. Frequently, if not inevitably, acidic rinse aid products will be subjected to UV light (e.g., sunlight) repeatedly and over extended periods of time prior to use by the consumer. The formulations of typical automatic dishwashing (ADW) rinse aid products are specifically tailored to a color that has been proven to be aesthetically pleasing to consumers. Any change in the target formulation color, especially when clear or translucent bottle or other packaging container is used, can negatively impact the consumer's perception of the quality of the product.
Typically, in the past, colored rinse aid compositions have been formulated at or near neutral pH, since it has been generally heretofore understood that non-acidic rinse aid compositions will not reduce the dye stability to ambient and ultraviolet light radiation. The inventors of the present invention have addressed this dye stability issue in the present invention and provided an effective solution to this problem. Before the present invention, there has been no method or composition known heretofore that addresses this dye stability problem in acidic rinse aid problem.
Accordingly, it has thus been desirable to have a colored acidic rinse aid product which is not significantly altered by UV light. Further, despite the above-mentioned disclosures in the art, it has been desirable to have an acidic rinse aid product which has superior performance in addition to a packaging appearance. It is extremely desirable that the packaging appearance (e.g., color) is maintained until the consumer has disposed of the product. The present invention overcomes the problems as set forth above.
BACKGROUND ART
U.S. Patent No. 5,254,282, issued on Oct. 19, 1993 to Fusiak, discloses acidified paint removal formulations which are stabilized against color formation by inclusion of a chelating agent; and
U.S. Patent No. 5,206,006, issued on April 27, 1993 to Frontini et al. discloses a composition of the trinder type for detecting hydrogen peroxide evolved in a solution, which contains a chelating agent, relevant portions of both of these patents being incorporated herein by reference.
SUMMARY OF THE INVENTION The invention meets the needs identified above by providing a colored acidic rinse aid product exhibiting improved stability of a dye used therein to ambient and ultra-violet light radiation. In one aspect of the present invention, the product comprises an enclosed container in which a colored acidic rinse aid composition is contained. The container has a recloseable opening through which the colored acidic rinse aid composition can be dispensed. The container has walls containing an effective amount of an ultraviolet light blocker to retard at least 50% of ultraviolet light having a wavelength less than about 400 nanometers, from the colored acidic rinse aid composition in the container. The colored acidic rinse aid composition includes: a low foaming nonionic surfactant present in a range of from about 2% to about 80% by weight of the rinse aid composition. The composition also includes a hydrotrope present in a range of from
about 0.5% to about 20% by weight of the rinse aid composition. The composition further includes a polyacrylate polymer present in a range of from about 0.1% to about 15% by weight of the rinse aid composition. The polymer has a weight average molecular weight in a range of from about 1000 to about 50,000.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the preferred embodiment of the present invention, the product comprises an enclosed container in which a colored acidic rinse aid composition is contained. The container has a recloseable opening through which the colored acidic rinse aid composition can be dispensed. The container has walls containing an effective amount of an ultraviolet light blocker to retard desirably at least 50% of ultraviolet light having a wavelength less than about 400 nanometers, from the colored acidic rinse aid composition in the container. Preferably, the container walls contain an effective amount of an ultraviolet light blocker to retard at least 75% of ultraviolet light having a wavelength less than about 375 nanometers from the colored acidic rinse aid composition in the container. It is essential to retard desirably, at least 50% of the UV light having a wavelength less than 400 nanometers so as to have a dye discoloration no greater than about 33% when the rinse aid is exposed to ambient light for a period of 6 months, or UV light for a period of 2 days.
In the preferred embodiment of the present invention, the colored acidic rinse aid composition desirably exhibits no more than about a 33% dye discoloration when exposed to one of ambient light for 6 months, or ultraviolet light for 2 days, or both, and preferably the colored acidic rinse aid product exhibits no more than about a 30% dye discoloration when exposed to ambient light for 6 months, and no more than about a 30% dye discoloration when exposed to UV light for 2 days.
Container In the preferred embodiment, the container blocks, retards, or otherwise inhibits ultraviolet light such that the uniquely formulated colored acidic rinse aid composition retains the target color. The ultraviolet light resistant container enhances the dye stability. The container, which can be a bottle made of high density polyethylene or the like, includes a UV light blocker as described in detail hereinafter. As used herein, the phrase "UV blocker" means any material which is capable of blocking, reflecting, inhibiting a sufficient amount UV light to protect the detergent composition from deleterious effects of the UV light. The amount of UV light "blocking" will thus vary with the formulation of the dishwashing detergent composition in the
container. The UV light blocker is preferably present in the container, or alternatively in the detergent composition itself, at an "effective amount" which will vary dramatically depending upon the size of the container. Typically amounts, which are based on the tear weight of the container, include from about 0.0001% to about 2% by weight, more preferably from about 0.0001% to about 0.8%, and most preferably from about 0.01% to about 0.5%. It is essential that the UV light blocker be adequately dispersed in the container walls such that UV light cannot substantially penetrate the container and contact the rinse aid composition. It is essential that the UV light blocker be so adequately dispersed, so that desirably, at least 50% of the ultraviolet light having a wavelength less than 400 nanometers is blocked and does not penetrate the container walls and contact the rinse aid.
In the preferred mode, a colorant, such as a blue tint, is also added to the container material, to enhance the aesthetic appearance of the container.
In the preferred embodiment, the container walls contain an effective amount of an ultraviolet light blocker to retard at least 75% of ultraviolet light having a wavelength less than about 375 nanometers from the colored acidic rinse aid composition in the container. Most preferably, the container walls contain an effective amount of an ultraviolet light blocker to retard at least 90% of ultraviolet light having a wavelength less than about 375 nanometers from the colored acidic rinse aid composition in the container. It is necessary to block out the aforementioned amounts of ultraviolet light in order to maintain the color stability of the dye colorant, especially when the colored acidic rinse aid composition is formulated without using a chelant in an amount of at least 1 ppm by weight, as an additional dye stabilizing ingredient. Optionally, and preferably, the rinse aid composition is also formulated with the chelant in an amount of at least 1 ppm by weight to additionally retard the discoloration of the dye when exposed to ambient and ultraviolet light
UV Light Blocker
One essential aspect of the invention involves the use of a UV light blocker which can be any material which fits the definition noted above. Exemplary UV light blockers suitable for use herein include those materials selected from the group consisting of benzotriazoles, orthohydroxy benzophenones, titanium dioxide, and mixtures thereof. The preferred UN light blocker are substituted benzotriazoles. Specific substituted benzotriazoles for use herein are commercially available from Ciba Geigy under the tradename Tinuvin. Another preferred substituted benzotriazole (Tinuvin 326; Ciba Geigy) has the formula
Yet another preferred substituted benzotriazole (Tinuvin P; Ciba Geigy) has the formula
Another preferred orthohydroxy benzophenone (Uvinul D49) has the formula
Yet another orthohydroxy benzophenone (Uvinul MS-40) has the formula
The most particularly preferred UV blockers are Eastman UV#9921G0031 and Colormatrix UV#80-224-6. Desirably, the Eastman UV#9921G0031 UV blocker is added in an amount ranging from 0.2% to 2.0% by weight of the polymer, for example, high density polyethylene, used for making the bottle.
Rinse aid composition In the preferred embodiment, the colored acidic rinse aid composition includes: a low foaming nonionic surfactant present in a range of from about 2% to about 80% by weight of the rinse aid composition. The composition also includes a hydrotrope present in a range of from about 0.5% to about 20% by weight of the rinse aid composition. The composition further
includes a polyacrylate polymer present in a range of from about 0.1 % to about 15% by weight of the rinse aid composition. The polymer has a weight average molecular weight in a range of from about 1000 to about 50,000.
Chelants In the preferred embodiment, the composition further includes a chelant. The chelant is desirably present in an amount of at least 1 ppm, preferably at least 50 ppm, more preferably at least 100 ppm and most preferably at least 150 ppm by weight of the rinse aid composition.
In the preferred embodiment, the acidic rinse aid composition includes chelants selected from the group consisting of amino carboxylates, amino phosphonates, polyfunctionally- substituted aromatic chelants, and mixtures thereof. Other useful chelants include iron and/or manganese chelants. Amino carboxylates useful as optional chelants include ethylenediaminetetracetates, N-hydroxyethylethylenediaminetriacetates, nitrilo-triacetates, ethylenediamine tetraproprionates, triethylenetetra-amine-hexacetates, diethylene- triaminepentaacetates, and ethanoldiglycines, alkali metal, ammonium, and substituted ammonium salts therein and mixtures therein.
Polyfunctionally-substituted aromatic chelants include dihydroxydisulfobenzenes such as l,2-dihydroxy-3,5-disulfobenzene, and ethylenediamine disuccinate ("EDDS")-
In the preferred embodiment, the chelant is selected from the group consisting of ethylene diamine tetra acetic acid carboxylate, diethylene triamine penta acetic acid carboxylate , and mixtures thereof. In another preferred embodiment, the chelants are selected from polyphosphonate, ethylene diamine tetra acetic acid carboxylate (EDTA) and diethylene triamine penta acetic acid carboxylate (DTPA). Most preferably, the chelant is ethylene triamine penta phosphoric acid.
Dyes In the preferred embodiment of the present invention, the dye is selected from the group consisting of Pontamine Blue (Copper Phthalocyanine Dyestuff), and Liquitant Patent Blue (polymeric colorant) and FD&C Blue #1 (having the molecular formula C37H34N2Na2θ9S3), and mixtures thereof. Preferably, the dye has a color selected from the group consisting of blue, green, or mixtures thereof. It has been found that the blue and green dyes typically used in rinse aid formulations, such as the FD&C #1, are unstable to UV light in acidic conditions unless the rinse aid composition is formulated with a chelant according to the present invention. It has been found that even the so-called "acid stable" dyes, such as Acid Blue 80, fade quickly when used in acidic rinse aids, i.e., the dye is colorless after an exposure of 1 to 2 days under UV light
radiation, unless the rinse aid is formulated according to one aspect of the present invention, with a chelant. Desirably, the dyes are added in an amount in a range of from about 0.25% of a 1% solution in water to about 0.5% of a 1% solution in water.
Dye-Chelant Systems
In the preferred embodiment the dye is selected from the group consisting of copper phthalocyanine dyestuff, FD&C #1 colors, polymeric colorants, and mixtures thereof, and the chelant is selected from the group consisting of amino carboxylates, amino phosphonates, polyfunctionally-substituted aromatic chelants, and mixtures thereof It has been found that these "dye-chelant" systems, optimally yield the most effective dye color stability to ambient and UV light radiation, when such dyes are used in acidic rinse aids.
The most preferred chelants are selected from polyphosphonate ethylene diamine tetra acetic acid carboxylate (EDTA) and diethylene triamine penta acetic acid carboxylate (DTPA) in combination with the most preferred dyes selected from blue dyes such as Pontamine Blue (Copper Phthalocyanine Dyestuff), and Liquitant Patent Blue (polymeric colorant) and FD&C Blue #1 (for example, an FD&C Blue #1 having the molecular formula C37H3 N2Na2θ9S3). These dye-chelant systems discovered by the inventors, when formulated in an acidic rinse aid dispersion, all form ambient and UV light resistant, color stable systems.
The especially preferred Dye-Chelant systems discovered by the inventors are listed below:
Liquitant Patent Blue in combination with CW-Base;
FD&C #1 in combination with CW-Base;
Pontamine Blue in combination with CW-Base;
Liquitant Patent Blue in combination with DTPA;
FD&C #1 in combination with DTPA; and
Liquitant Patent Blue in combination with DTPA.
Carboxylic acids
In the preferred embodiment, the dye stability is further enhanced in the presence of carboxylic acids. Especially preferred are polycarboxylic acids, such as Sokolan PA13PN manufactured by BASF, Acusol 480, and Acusol 480N, both manufactured by Rohm & Haas. These polycarboxylic acids provide multiple benefits, as they help stabilize the dye and deliver filming performance benefits in the rinse cycle of automatic dishwashing. Desirably, the polycarboxylic acid is present in an amount in a range of from about 0.25% to about 10% by weight of the acidic rinse aid composition, and preferably, in an amount in a range of from about 1% to about 6% by weight.
Low Foaming Nonionic Surfactant
The nonionic surfactants useful in the acidic rinse aid dispersion may be any known low foaming nonionic surfactant used in machine dishwashing applications. Typical suitable nonionic surfactants include the following commercially available materials: Triton R™ CF-10 (an alkylaryl polyether) and Triton DF-16 (a modified polyalkoxylated alcohol) manufactured by Rohm and Haas Company; Plurafac LF404™, Plurafac LF400™ (mixed linear alcohol alkoxylates), and Pluronic R™ L-62 (a polyoxyethylene-polyoxypropylene block copolymer), all manufactured by BASF Wyandotte Corporation, and BASF RA30 surfactant, manufactured by BASF Corporation. The rinse aid formulation of the invention may contain one or a mixture of such low foaming nonionic surfactants.
Essentially any nonionic surfactants useful for detersive purposes can be included in the rinse aid compositions. Exemplary, non-limiting classes of useful nonionic surfactants are listed below.
(i) Nonionic polyhydroxy fatty acid amide surfactant
Polyhydroxy fatty acid amides suitable for use herein are those having the structural formula R2CONR1Z wherein: Rj is H, -C4 hydrocarbyl, 2-hydroxy ethyl, 2-hydroxy propyl, or a mixture thereof, preferable Cj-C alkyl, more preferably or C2 alkyl, most preferably Ci alkyl (i.e., methyl); and R2 is a C5 -C31 hydrocarbyl, preferably straight-chain C5 -C!9 alkyl or alkenyl, more preferably straight-chain C9-C17 alkyl or alkenyl, most preferably straight-chain Cn-Cπ alkyl or alkenyl, or mixture thereof; and Z is a polyhydroxyhydrocarbyl having a linear hydrocarbyl chain with at least 3 hydroxyls directly connected to the chain, or an alkoxylated derivative (preferably ethoxylated or propoxylated) thereof. Z preferably will be derived from a reducing sugar in a reductive animation reaction; more preferably Z is a glycityl. (ii) Nonionic condensates of alkyl phenols
The polyethylene, polypropylene, and polybutylene oxide condensates of alkyl phenols are suitable for use herein. In general, the polyethylene oxide condensates are preferred. These compounds include the condensation products of alkyl phenols having an alkyl group containing from about 6 to about 18 carbon atoms in either a straight chain or branched chain configuration with the alkylene oxide, (iii) Nonionic ethoxylated alcohol surfactant
The alkyl ethoxylate condensation products of aliphatic alcohols with from about 1 to about 25 moles of ethylene oxide are suitable for use herein. The alkyl chain of the aliphatic alcohol can either be straight or branched, primary or secondary, and generally contains from 6 to 22 carbon atoms. Particularly preferred are the condensation products of alcohols having an alkyl group
containing from 8 to 20 carbon atoms with from about 2 to about 10 moles of ethylene oxide per mole of alcohol.
(iv) Nonionic ethoxylated/propoxylated fatty alcohol surfactant
The ethoxylated C6-Cι8 fatty alcohols and C6 -Cj8 mixed ethoxylated/propoxylated fatty alcohols are highly preferred surfactants for use herein, particularly where water soluble. Preferably the ethoxylated fatty alcohols are the Go - 8 ethoxylated fatty alcohols with a degree of ethoxylation of from 3 to 50, most preferably these are the C12 -Cj8 ethoxylated fatty alcohols with a degree of ethoxylation from 3 to 40. Preferably the mixed ethoxylated/propoxylated fatty alcohols have an alkyl chain length of from 10 to 18 carbon atoms, a degree of ethoxylation of from 3 to 30 and a degree of propoxylation of from 1 to 10.
(v) Nonionic EO/PO condensates with propylene glycol
The condensation products of ethylene oxide with a hydrophobic base formed by the condensation of propylene oxide with propylene glycol are suitable for use herein. The hydrophobic portion of these compounds preferably has a molecular weight of from about 1500 to about 1800 and exhibits water insolubility. Examples of compounds of this type include certain of the commercially-available Pluronic™. surfactants, marketed by BASF.
(vi) Nonionic EO condensation products with propylene oxide/ethylene diamine adducts
The condensation products of ethylene oxide with the product resulting from the reaction of propylene oxide and ethylenediamine are suitable for use herein. The hydrophobic moiety of these products consists of the reaction product of ethylenediamine and excess propylene oxide, and generally has a molecular weight of from about 2500 to about 3000. Examples of this type of nonionic surfactant include certain of the commercially available Tetronic™ compounds, marketed by BASF.
(vii) Nonionic alkylpolvsaccharide surfactant
Suitable alkylpolysaccharides for use herein are disclosed in U.S. Pat. No. 4,565,647, Llenado, issued Jan. 21, 1986, having a hydrophobic group containing from about 6 to about 30 carbon atoms, preferably from about 10 to about 16 carbon atoms and a polysaccharide, e.g., a polyglycoside, hydrophilic group containing from about 1.3 to about 10, preferably from about
1.3 to about 3, most preferably from about 1.3 to about 2.7 saccharide units. Any reducing saccharide containing 5 or 6 carbon atoms can be used, e.g., glucose, galactose and galactosyl moieties can be substituted for the glucosyl moieties. (Optionally the hydrophobic group is attached at the 2-, 3-, 4-, etc. positions thus giving a glucose or galactose as opposed to a glucoside or galactoside.) The intersaccharide bonds can be, e.g., between the one position of
the additional saccharide units and the 2-, 3-, 4-, and/or 6- positions on the preceding saccharide units.
The preferred alkylpolyglycosides have the formula:
R2 0(Cn H2nO)t(glycosyl)x wherein R2 is selected from the group consisting of alkyl, alkylphenyl, hydroxyalkyl, hydroxyalkylphenyl, and mixtures thereof in which the alkyl groups contain from 10 to 18, preferably from 12 to 14, carbon atoms; n is 2 or 3, preferably from about 1.3 to about 3, most preferably from about 1.3 to about 2.7. The glycosyl is preferably derived from glucose, (viii) Nonionic fatty acid amide surfactant Fatty acid amide surfactants suitable for use herein are those having the formula:
O
R6— C— N(R7)2 wherein R > 6 i ■s an alkyl group containing from 7 to 21, preferably from 9 to 17 carbon atoms and each R >7 i •s selected from the group consisting of hydrogen, C C4 alkyl, Cι-C4 hydroxyalkyl, and — (C2 Ht 0)x H, where x is in the range of from 1 to 3.
The hydrotrope useful in the present rinse aid dispersion is selected from the group consisting of sodium cumene sulfonate, sodium xylene sulfonate, sodium toluenesulfonate, dioctyl sodium sulfosuccinate, alkyl naphthalene sulfonate and dihexyl sodium sulfosuccinate. Preferably, the hydrotrope is sodium cumene sulfonate.
Polyacrylate polymer
The low molecular weight polyacrylate polymer useful in the present acidic rinse aid dispersion is selected from the group consisting of polyacrylate homopolymer, polyacrylate copolymer, polyacrylate terpolymer, and mixtures thereof. Preferably, the polyacrylate polymer is a partially neutralized or non-neutralized polyacrylate polymer having a pH in a range of from about 2.0 to about 4.0. In the preferred embodiment, the polyacrylate polymer is desirably at least about 75% non-neutralized. Alternatively, the polyacrylate polymer is non-neutralized. Still alternatively, a neutralized polyacrylate polymer, which is more than 25% neutralized may also be used, but an acid must be added in an amount sufficient to bring the pH value of the resultant rinse aid dispersion within a range of from about 2 to about 6.
Typically the polyacrylate polymer is a homopolymer of acrylic or methacrylic acid, or a copolymer formed from at least about 50 weight percent acrylic acid. The polyacrylate polymer is a low molecular weight polymer or its alkali metal or ammonium salt, having a weight average molecular weight ranging from about 1,000 to about 40,000.
Acid
When adding an acid to the rinse aid dispersion, any acid may be used although organic acids are more desirable and the preferred organic acid is citric acid.
It has been discovered that even in the absence of a compatibilizing high molecular weight polymer, but with the addition of a hydrotrope and in acidic conditions, the stable rinse aid dispersion does not phase separate upon storage for a reasonable time or under actual use conditions and permits each component to effectively reduce spotting and filming and improve sheeting action without interfering with the foaming and defoaming action of the surfactant.
In the preferred embodiment, the rinse aid formulation of the invention is an aqueous dispersion at a pH of from about 2 to about 6. Preferably, the pH ranges from about 3 to about 5.
The rinse aid dispersion of the present invention is preferably prepared by stirring the desired amount of the surfactant into an aqueous solution of the low molecular weight non- neutralized or only partially neutralized (no more than 25% neutralized) poly aery lie acid followed by the gradual addition of the hydrotrope and if necessary, citric acid to bring the dispersion to within the desired pH range.
The formulation may also contain other additives including sequestants such as NTA, EDTA, or sodium citrate and water miscible solvents such as ethanol, isopropanol and propylene glycol. Ethanol is the preferred solvent, present desirably in a range of from about 0.1% to about 10% by weight of the rinse aid dispersion and preferably in a range of from about 2% to about 8% by weight.
Hydrotrope
In the preferred embodiment, the hydrotrope is selected from the group consisting of sodium cumene sulfonate, sodium xylene sulfonate, sodium toluenesulfonate, dioctyl sodium sulfosuccinate, alkyl naphthalene sulfonate and dihexyl sodium sulfosuccinate. Preferably, the hydrotrope is sodium cumene sulfonate, and the partially-neutralized polyacrylate polymer is a polyacrylate copolymer which is about 20% neutralized. In the preferred embodiment, the stable aqueous rinse aid dispersion is essentially free of a high molecular weight compatibilizing polymer and is also free of an additional nonionic surfactant having a cloud point of at least 70 degrees C.
The following examples are intended to illustrate the invention.
EXAMPLE 1 A rinse aid dispersion according to the present invention is made as follows, from the following composition, by weight percent:
Low foam nonionic surfactant 35.0%
Sodium cumene sulfonate hydrotrope 4.0%
Polyacrylate copolymer (20% neutralized) 4.0%
Citric acid 1.6%
Ethanol 6.0%
FD&C Blue #1 0.25%
Water 49.15%
This dye has ambient and UV light radiation stability and its color is essentially unchanged after exposure to UV radiation for 1-2 days. Specifically, the rinse aid product exhibits no more than about a 33% dye discoloration when exposed to one of ambient light for 6 months, or ultraviolet light for 2 days.
EXAMPLE 2 A rinse aid dispersion according to the present invention is made as follows, from the following composition, by weight percent: Low foam nonionic surfactant 20.0%
Sodium cumene sulfonate hydrotrope 7.0%
Polyacrylate copolymer (20% neutralized) 4.5%
Ethanol 6.0%
Chelant (DTPA) 0.015%
Liquitant Patent Blue 0.25%
Water 62.235%
This dye has ambient and UV light radiation stability and its color is unchanged after exposure to UV radiation for 1-2 days.
EXAMPLE 3 Another rinse aid dispersion according to the present invention is made as follows, from the following composition, by weight percent:
Low foam nonionic surfactant 35.0%
Sodium cumene sulfonate hydrotrope 4.0%
Polyacrylate copolymer (20% neutralized) 4.0%
Citric acid 1.6%
Ethanol 6.0%
Chelant (polyphosphonate) 0.05%
FD&C Blue #1 0.25%
Water 49.17%
This dye has ambient and UV light radiation stability and its color is unchanged after exposure to UV radiation for 1-2 days.
EXAMPLE 4 Another rinse aid dispersion according to the present invention is made as follows, from the following composition, by weight percent:
Low foam nonionic surfactant 12.0%
Sodium cumene sulfonate hydrotrope 4.0%
Polyacrylate copolymer (20% neutralized) 1.0%
Citric acid 1.6%
Ethanol 5.0%
Chelant (polyphosphonate) 0.05%
FD&C Blue #1 0.25%
Water 76.17%
This dye has ambient and UV light radiation stability and its color is unchanged after exposure to UV radiation for 1-2 days.
The above rinse aid formulations are prepared by the following procedure: appropriate amounts of: a low foaming nonionic surfactant (Plurafac LF 400™), a 45% active sodium cumene sulfonate hydrotrope (45% active SCS), a 50% active polyacrylate copolymer (Acusol 480™, made by Rohm & Haas), a 50% active citric acid, ethanol and deionized water are added to a beaker and stirred sequentially. Also added is a chelant (polyphosphonate) in an amount of 0.05 weight % (500 ppm by weight) and a color dye as indicated. The resulting mixture obtained is a blue or green colored, single-phase acidic dispersion and is stable, with no phase separation occurring after the resulting mixture is kept undisturbed in a closed container for a period of 2 weeks at a temperature of 50 degrees C.
The container used for enclosing the rinse aid composition preferably has a UV blocker such as one manufactured by Eastman Kodak and sold under the tradename Eastman UN#9921G0031. The blocker is used in an amount of about 0.5% by weight. It is determined that the UN blocker blocks at least 75% of the ultraviolet light having a wavelength less than about 375 nanometers.
Accordingly, having thus described the invention in detail, it will be obvious to those skilled in the art that various changes may be made without departing from the scope of the invention and the invention is not to be considered limited to what is described in the specification.
Claims
1. A colored acidic rinse aid product exhibiting improved stability of a dye used therein to ambient and ultra-violet light radiation, characterized by: an enclosed container in which a colored acidic rinse aid composition is contained, said container having a recloseable opening through which said colored acidic rinse aid composition can be dispensed, said container having walls containing an effective amount of an ultraviolet light blocker to retard at least 50% of ultraviolet light having a wavelength less than 400 nanometers, from said colored acidic rinse aid composition in said container; said colored acidic rinse aid composition including: a low foaming nonionic surfactant present in a range of from 2% to 80% by weight of said rinse aid composition; a hydrotrope present in a range of from 0.5% to 20% by weight of said rinse aid composition; and a polyacrylate polymer present in a range of from 0.1% to 15% by weight of said rinse aid composition, said polymer having a weight average molecular weight in a range of from 1000 to 50,000.
2. A colored acidic rinse aid product according to claim 1, wherein said container has walls containing an effective amount of an ultraviolet light blocker to retard at least 75% of ultraviolet light having a wavelength less than 375 nanometers, from said colored acidic rinse aid composition in said container.
3. A colored acidic rinse aid product according to claims 1-2, wherein said colored acidic rinse aid composition exhibits no more than a 33% dye discoloration when exposed to one of ambient light for 6 months, or ultraviolet light for 2 days, or both.
4. A colored acidic rinse aid product according to claims 1-3, wherein said ultraviolet light blocker is selected from the group consisting of benzotriazoles, orthohydroxybenzophenones, titanium dioxide, and mixtures thereof.
5. A colored acidic rinse aid product according to claims 1-4, wherein said ultraviolet light blocker is present in an amount of from 0.0001% to 2% by weight of said container.
6. A colored acidic rinse aid composition according to claims 1-5, wherein said rinse aid has a pH in a range of from 2 to 7.
7. A colored acidic rinse aid composition according to claims 1-6, including an acid present in a range of from 0.1% to 20% by weight of said rinse aid composition.
8. A colored acidic rinse aid composition according to claims 1-7, wherein said acid is present in the form of one or more of a non-neutralized polyacrylate polymer, a partially neutralized polyacrylate polymer, said neutralization being no more than 25%, and mixtures thereof.
9. A colored acidic rinse aid composition according to claims 1-8, wherein said polyacrylate polymer is selected from the group consisting of polyacrylate homopolymer, polyacrylate copolymer, polyacrylate terpolymer, and mixtures thereof.
10. A colored acidic rinse aid composition according to claims 1-9, including a chelant, said chelant being present in an amount of at least 1 ppm by weight of said rinse aid composition.
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US6797751B2 (en) | 2000-02-01 | 2004-09-28 | Ciba Specialty Chemicals Corporation | Method of content protection with durable UV absorbers |
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US4175062A (en) * | 1977-03-05 | 1979-11-20 | Henkel Kommanditgesellschaft Auf Aktien (Henkel Kgaa) | Aqueous cleanser compositions |
US4880558A (en) * | 1987-06-19 | 1989-11-14 | Henkel Kommanditgesellschaft Auf Aktien | Liquid cleaning preparation for hard surfaces |
WO1993005107A1 (en) * | 1991-09-12 | 1993-03-18 | E.I. Du Pont De Nemours And Company | Polyoxymethylene resin composition |
WO1997020880A1 (en) * | 1995-12-07 | 1997-06-12 | Alphapointe Association For The Blind | Transparent, light resistant container for medicinal agents |
US5733858A (en) * | 1995-08-30 | 1998-03-31 | The Dow Chemical Company | Succinic acid derivative degradable chelants, uses and compositions thererof |
WO1999053008A1 (en) * | 1998-04-09 | 1999-10-21 | The Procter & Gamble Company | Dishwashing detergent product having a ultraviolet light resistant bottle |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0847979A (en) * | 1994-08-05 | 1996-02-20 | Mitsui Petrochem Ind Ltd | Polyester bottle possible to re-fill |
-
2000
- 2000-01-20 WO PCT/US2000/001384 patent/WO2000043318A2/en active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4175062A (en) * | 1977-03-05 | 1979-11-20 | Henkel Kommanditgesellschaft Auf Aktien (Henkel Kgaa) | Aqueous cleanser compositions |
US4880558A (en) * | 1987-06-19 | 1989-11-14 | Henkel Kommanditgesellschaft Auf Aktien | Liquid cleaning preparation for hard surfaces |
WO1993005107A1 (en) * | 1991-09-12 | 1993-03-18 | E.I. Du Pont De Nemours And Company | Polyoxymethylene resin composition |
US5733858A (en) * | 1995-08-30 | 1998-03-31 | The Dow Chemical Company | Succinic acid derivative degradable chelants, uses and compositions thererof |
WO1997020880A1 (en) * | 1995-12-07 | 1997-06-12 | Alphapointe Association For The Blind | Transparent, light resistant container for medicinal agents |
WO1999053008A1 (en) * | 1998-04-09 | 1999-10-21 | The Procter & Gamble Company | Dishwashing detergent product having a ultraviolet light resistant bottle |
Non-Patent Citations (1)
Title |
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PATENT ABSTRACTS OF JAPAN vol. 1996, no. 06, 28 June 1996 (1996-06-28) & JP 08 047979 A (MITSUI PETROCHEM IND LTD), 20 February 1996 (1996-02-20) * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6797751B2 (en) | 2000-02-01 | 2004-09-28 | Ciba Specialty Chemicals Corporation | Method of content protection with durable UV absorbers |
US7288583B2 (en) | 2000-02-01 | 2007-10-30 | Ciba Specialty Chemicals Corporation | Method of content protection with durable UV absorbers |
Also Published As
Publication number | Publication date |
---|---|
WO2000043318A3 (en) | 2000-09-28 |
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