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
  • C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
  • C11D17/0039—Coated compositions or coated components in the compositions, (micro)capsules
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
  • C09B63/00—Lakes
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
  • C09B67/00—Influencing the physical, e.g. the dyeing or printing properties of dyestuffs without chemical reactions, e.g. by treating with solvents grinding or grinding assistants, coating of pigments or dyes; Process features in the making of dyestuff preparations; Dyestuff preparations of a special physical nature, e.g. tablets, films
  • C09B67/0097—Dye preparations of special physical nature; Tablets, films, extrusion, microcapsules, sheets, pads, bags with dyes
• • 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
  • C11D11/00—Special methods for preparing compositions containing mixtures of detergents
  • C11D11/0082—Special methods for preparing compositions containing mixtures of detergents one or more of the detergent ingredients being in a liquefied state, e.g. slurry, paste or melt, and the process resulting in solid detergent particles such as granules, powders or beads
  • C11D11/0088—Special methods for preparing compositions containing mixtures of detergents one or more of the detergent ingredients being in a liquefied state, e.g. slurry, paste or melt, and the process resulting in solid detergent particles such as granules, powders or beads the liquefied ingredients being sprayed or adsorbed onto solid particles
• • 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
  • C11D17/0008—Detergent materials or soaps characterised by their shape or physical properties aqueous liquid non soap compositions
  • C11D17/0013—Liquid compositions with insoluble particles in suspension
• • 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
  • C11D3/22—Carbohydrates or derivatives thereof
  • C11D3/222—Natural or synthetic polysaccharides, e.g. cellulose, starch, gum, alginic acid or cyclodextrin
  • C11D3/225—Natural or synthetic polysaccharides, e.g. cellulose, starch, gum, alginic acid or cyclodextrin etherified, e.g. CMC
• • 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
  • C11D3/3753—Polyvinylalcohol; Ethers or esters 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
  • C11D3/40—Dyes ; Pigments

Definitions

• the present invention generally relates to liquid automatic dishwashing detergent compositions. More particularly, the invention relates to a process for making colored particles that can be incorporated into a bleach-contammg or non-bleach-contammg liquid automatic dishwashing detergent composition for improving the aesthetics of the liquid composition wherein the colored particles do not stain the plastic surfaces of dishware or an automatic dishwasher.
• liquid ADW products have a preference for such products having a certain color or appearance.
• the addition of solid particles suspended into a liquid ADW composition can improve the aesthetics of the product by simply improving the physical appearance of the product. This is particularly true if the particles are colored and their color is matched effectively to the base color of the liquid ADW composition.
• Previously used particles in liquid ADW products have had a major disadvantage of contributing negatively to unwanted filming, particularly on glass, stainless steel and plastic surfaces. This is because the previously used particles have been coated with water-msoluble coatings, such as waxes, which melt and are released into the wash solution due to the high temperature encountered during the automatic dishwashing process.
• the particles cannot be colored by simply using a dye, because du ⁇ ng storage of the liquid ADW product, the dye gets bleached
• the formulators have to use bleach-safe pigments to impart an aesthetically pleasing color
• the incorporation of pigments posed a major problem: the color of the pigment is found to detrimentally stain plastic surfaces, such as plastic dishware and the internal plastic surfaces of a dishwasher.
• the inventors of the present invention have discovered a process of coating the particles with a pigment in a manner such that the particles are non-stammg.
• This invention is not limited to just bleach-contammg liquid ADWs and is also applicable to non-bleach-contammg liquid ADWs that are incorporated with prills or particles colored with pigments.
• the present invention is thus directed to overcome one or more of the problems as set forth before.
• the invention meets the needs above by providing a process for forming a non-stammg colored composite particle suitable for incorporation in a bleach-contammg or non-bleach- contaming liquid detergent composition, a non-stainmg colored composite particle and a liquid dishwashing detergent composition.
• the process includes the steps of forming a colored liquid dispersion of pigment particles in a first liquid medium.
• the size of the pigment particles in the colored liquid dispersion is no greater than about 5 ⁇ m.
• the process includes the step of mixing the colored liquid dispersion with a polymeric material and a second liquid medium to form a sprayable colored polyme ⁇ c mate ⁇ al.
• the polymeric mate ⁇ al being selected from the group consisting of alkyl cellulose ethers and polyvinyl alcohol.
• the process also includes the step of spraying the colored polyme ⁇ c material on a composite particle and forming a colored polyme ⁇ c coating on the composite particle.
• a non-staining colored composite particle suitable for incorporation in a bleach-contammg liquid detergent composition is disclosed.
• the particle is made by the process as set forth above.
• a liquid automatic dishwashing detergent product is disclosed.
• the product includes a liquid dishwashing detergent composition containing chlo ⁇ ne bleach, and non-staming colored composite particles.
• the particles are made by the process as set forth above. DETAILED DESCRIPTION OF THE INVENTION
• the process includes the steps of forming a colored liquid dispersion of pigment particles in a first liquid medium.
• the size of the pigment particles in the colored liquid dispersion is desirably no greater than about 5 ⁇ m, preferably no greater than about 1 ⁇ m, more preferably no greater than about 0J ⁇ m, and most preferably no greater than about 0.01 ⁇ m. It has been surp ⁇ smgly discovered that when the pigment particle size in the pigment-liquid dispersion is maintained withm the above size limitations, the resultant pigment, when deposited on a particle as a part of the sprayable polyme ⁇ c slurry, is essentially non-stammg. i.e., its color does not transfer onto plastic surfaces. The selection of the pigment particle size is the key to the present invention.
• the first liquid medium is preferably water.
• a minor amount of a nomonic surfactant is added to the water to improve the dispersion of the pigment. Typically, this surfactant is added in an amount no greater than about 10% by weight.
• the process includes the step of maintaining the amount of surfactants used in the bleach-containing liquid detergent composition at a preselected value such that when the bleach-containing liquid detergent composition is diluted m a wash solution, the amount of surfactant delivered m the wash solution is less than c ⁇ tical micelle concentration
• critical micelle concentration is well known to those skilled m the art and need not be explained any further for purposes of brevity.
• Polvmenc coating In the preferred embodiment, the colored polyme ⁇ c coating is insoluble in the liquid automatic dishwashing detergent composition but soluble m automatic dishwashing wash solution. The coating is prepared from mate ⁇ als which are insoluble in the liquid automatic dishwashing detergent composition but soluble m automatic dishwashing wash solution.
• the coaling is prepared from mate ⁇ als selected from the group consisting of alkyl cellulose ethers and polyvmyl alcohol.
• the coating is prepared from algmate.
• the alkyl cellulose ethers are selected from one of methyl cellulose and hydroxypropyl methyl cellulose (HPMC).
• HPMC hydroxypropyl methyl cellulose
• the coating is prepared from methyl cellulose having a number average molecular weight desirably in a range of from about 5000 to about 100,000, more preferably from about 10,000 to about 20,000, and most preferably, about 14,000.
• the preferred methyl cellulose IS one sold under the trade name Methocel A15LV. and manufactured by Dow Chemicals.
• the polymeric coating is polyvmyl alcohol (PVA) having a molecular weight, desirably m a range of from about 5000 to about 100,000, and preferably from about 13,000 to about 23,000
• PVA polyvmyl alcohol
• the preferred PVA is from about 87% to about 89% hydrolyzed, such as a commercially available product having a trade name Airvol 205.
• the particles are insoluble in the liquid automatic dishwashing detergent composition and only soluble m the wash solution du ⁇ ng automatic dishwashing.
• the process by which the colored polymeric coating is prepared and deposited upon the particle is critical in order for the particles to remain undissolved in the liquid automatic dishwashing detergent composition and only become soluble m the wash solution du ⁇ ng automatic dishwashing. It is desirable that the particles dispersed m the liquid ADW compositions do not break up or dissolve in the composition. It is also desirable that this be achieved without depositing an unduly thick coating of a polymeric mate ⁇ al on the particle. It has been surprisingly discovered that when the polyme ⁇ c mate ⁇ al, such as methyl cellulose is sufficiently hydrated before spraying on the particle or prill, the polymer coated particle or prill remains stable, unbroken and undissolved in the liquid ADW composition.
• This hydration is achieved by forming a sprayable aqueous solution of the polymer (alkyl cellulose ether and/or polyvmyl alcohol) having a polymer concentration desirably in a range of from about 1% to about 30%) by weight, preferably in a range of about 3% to about 20 %, more preferably in a range of about 3% to about 10 %, and most preferably, about 5%.
• the temperature of aqueous solution of the polymer is desirably maintained within a range of from about 30 °C to about 40 °C while spraying the polymer solution on the particle, and preferably m a range of from about 32 °C to about 38 °C, and most preferably at a temperature of about 35 °C.
• the coating is desirably present m an amount in a range of from about 1% to about 25% by weight of the particle, preferably from about 4% to about 10% by weight of the particle, and most preferably, about 5% by weight of the particle.
• the reduced coating weight levels are desirable so that the least effective coating amount is used in order to accomplish the objective to having a protective coating without unnecessary polymer that might det ⁇ mentally contribute to unwanted residue deposition in the washing machine.
• the particles are colored and the automatic dishwashing liquid detergent composition is clear or translucent, so as to make the liquid automatic dishwashing product aesthetically pleasing.
• the particles and the liquid automatic dishwashing detergent composition are both colored and the color of the particles is matched to the base color of the liquid composition.
• the particles have a dark green color whereas the liquid composition has a light green color.
• Other preferred color combinations for the polyme ⁇ c coating on the particles and the liquid automatic dishwashing composition are: blue:blue, blue:wh ⁇ te, gree green, greemwhite and green:yellow, respectively.
• the particles comprise from about 0.1% to about 5.0% by weight of the liquid composition, and preferably, from about 0.2% to about 1.0% by weight of the liquid composition.
• a non-stammg colored composite particle suitable for incorporation in a bleach-contammg liquid detergent composition is disclosed. The particle is made by the process as set forth above.
• the particles can be formed from va ⁇ ous mate ⁇ als that do not cause any det ⁇ mental affect upon the performance of the liquid detergent.
• the particles are in the form of p ⁇ lls.
• the prills typically have a core which is coated with a polyme ⁇ c coating as desc ⁇ bed before.
• the core can be made from sucrose, as an example.
• the method of forming p ⁇ lls is well known to those skilled m the art and is disclosed m the literature, such as for example, in U.S. Patent No. 4,965,012, which is incorporated herein by reference.
• the particles can be of va ⁇ ous sizes and shapes, such as sphe ⁇ cal, oval, cyhnd ⁇ cal or polygonal and desirably have a particle size in a range of from about 200 ⁇ m to about 5000 ⁇ m, preferably, from about 400 ⁇ m to about 2000 ⁇ m, and most preferably, from about 500 ⁇ m to about 850 ⁇ m.
• a liquid automatic dishwashing detergent product in yet another embodiment, includes a liquid dishwashing detergent composition containing chlorine bleach, and non-stammg colored composite particles. The particles are made by the process as set forth above. Liquid automatic dishwashing composition components
• the liquid automatic dishwashing detergent product is highly viscous in a quiescent state and has a relatively high yield stress values. When subjected to shear stresses, however, such as being shaken m a container or squeezed through an orifice, the product quickly fluidizes and upon cessation of the applied shear stress, quickly reverts to a high viscosity state.
• the above liquid automatic dishwashing detergent product is preferably low foaming, readily soluble in the washing medium and most effective at pH values best conducive to improved cleaning performance, such as in a range of desirably from about pH 7.0 to about pH 13.0, and preferably from about pH 8.0 to about pH 12.0.
• the physical stability of the liquid product may be improved and the thickness of the liquid product may be altered by the addition of a cross linking polyacrylate thickener to the liquid detergent product as a thixotropic thickener.
• the pH adjusting components are desirably selected from sodium or potassium carbonate or sesquicarbonate, sodium or potassium silicate, cit ⁇ c acid, sodium or potassium bicarbonate, sodium or potassium borate, sodium or potassium hydroxide, and mixtures thereof.
• KOH are the preferred ingredients for increasing the pH to withm the above ranges.
• Other preferred pH adjusting ingredients are sodium carbonate, potassium carbonate, and mixtures thereof.
• Chlo ⁇ ne bleach stable low foaming surfactants are preferred and such surfactants are present in a range of from about 0.1% to about 10% by weight of the liquid composition.
• Such surfactants are generally known to one skilled m the art and need not be elaborated here, for purposes of brevity.
• One example of such a surfactant is an aniomc surfactant commercially available under the trade name Dowfax.
• the liquid automatic dishwashing detergent composition optionally also contains from about 0.5% to about 20% of a dispersant polymer selected from the group consisting of polyacrylates and polyacrylate copolymers, and from about 0.1% to about 5% of a chlo ⁇ ne bleach stable foam suppressant.
• a dispersant polymer selected from the group consisting of polyacrylates and polyacrylate copolymers
• foam suppressants are well known to those skilled in the art.
• Sample A of the liquid automatic dishwashing detergent product composition is formulated using the below named ingredients, as set forth in Example A.
• the non-staining colored particles having a sphencal shape, and a diameter of about 750 ⁇ m are formed from a sucrose core coated with a polyme ⁇ c coating formed from methyl cellulose (Methocel A15LV), and having a bluish-green color.
• the bluish- green color is imparted by adding a pigment into the methyl cellulose coating before spraying it on the particle according to the process of the present invention.
• the particles comp ⁇ se about 0.1% to about 5% by weight of the liquid composition.
• the optimum methyl cellulose coating is about 5% by weight of the particle.
• the coating is sprayed on the sucrose core particle by spraying a 5% by weight aqueous solution of methyl cellulose with pigment.
• the aqueous solution temperature being carefully maintained at about 35 °C.
• the size of the pigment particles in the aqueous solution is no greater than about 1 ⁇ m.
• the resultant particles are insoluble in the liquid composition but are soluble m the wash solution du ⁇ ng automatic dishwashing.
• the resultant colored particles are also non-stammg to plastic surfaces.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Life Sciences & Earth Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Wood Science & Technology (AREA)
• Health & Medical Sciences (AREA)
• Molecular Biology (AREA)
• Emergency Medicine (AREA)
• Detergent Compositions (AREA)

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• 2000
  • 2000-04-18 WO PCT/US2000/010386 patent/WO2000063341A1/en not_active Application Discontinuation
  • 2000-04-18 AU AU43582/00A patent/AU4358200A/en not_active Abandoned
  • 2000-04-18 CA CA002368600A patent/CA2368600C/en not_active Expired - Lifetime
  • 2000-04-18 JP JP2000612420A patent/JP2002542383A/ja active Pending
  • 2000-04-18 EP EP00923464A patent/EP1171569A1/de not_active Withdrawn

Non-Patent Citations (1)

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