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
  • C11D3/16—Organic compounds
  • C11D3/26—Organic compounds containing nitrogen
  • C11D3/33—Amino carboxylic 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
  • C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
  • C11D17/0047—Detergents in the form of bars or tablets
  • C11D17/0065—Solid detergents containing builders
  • C11D17/0073—Tablets
• • 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
  • C11D17/06—Powder; Flakes; Free-flowing mixtures; Sheets

Definitions

• the present invention relates to a detergent composition which incorporates sodium salts of nitrilotriacetic acid and/or ethylenediaminetetraacetic acid, as sequestering agents and detergent builders.
• tableted detergent compositions can take a variety of different forms and include many different detergent compositions, as desired. Powders are also widely used. These are also dispensed from spray dispensers. However, because of their form, care must be taken to assure that they do not cake up in the dispensers. Further, components of powdered detergents must be uniformly mixed. The physical properties of the components can affect this.
• Typical detergent compositions will include a source of alkalinity, a sequestering agent and/or builders, surfactants, antiredeposition aids and the like. Typically, phosphates are used as sequestering agents and detergent builders.
• NTA alkali metal salts of nitrilotriacetic acid and ethylenediaminetetraacetic acid
• EDTA alkali metal salts of nitrilotriacetic acid and ethylenediaminetetraacetic acid
• NTA and/or EDTA as the builder replacing the phosphates.
• NTA/EDTA product which can be easily compacted to form a tableted detergent. The objects and advantages of the present invention are achieved through the use of an agglomerated NTA/EDTA.
• the present invention provides a chemical composition comprising an alkali metal salt selected from the group consisting of alkali metal salts of nitrilotriacetic acid and alkali metal salts of ethylenediaminetetraacetic acid, wherein said alkali metal salt is agglomerated with a liquid active detergent composition to form an agglomerated alkali metal salt.
• an alkali metal salt selected from the group consisting of alkali metal salts of nitrilotriacetic acid and alkali metal salts of ethylenediaminetetraacetic acid
• said alkali metal salt is agglomerated with a liquid active detergent composition to form an agglomerated alkali metal salt.
• the reference to NTA/EDTA will specifically include NTA, EDTA and mixtures of NTA and EDTA. More specifically, the NTA/EDTA is combined with a liquid in a mixing apparatus to cause the NTA/EDTA to form agglomerated particles. These agglomerated
• the liquid used to agglomerate the NTA/EDTA is a functionally active material which contributes to the detergency of the final blend, such as an aqueous dispersion of anti- redeposition polymer, a surfactant, a defoaming agent, or other liquid active detergent composition.
• a functionally active material which contributes to the detergency of the final blend
• an aqueous dispersion of anti- redeposition polymer, a surfactant, a defoaming agent, or other liquid active detergent composition is a functionally active material which contributes to the detergency of the final blend.
• a functional liquid components or composition to be thoroughly mixed with the NTA/EDTA and subsequently uniformly mixed with the detergent composition. This facilitates uniform blending of low concentration liquid components.
• the agglomerate NTA/EDTA will not cake as easily as untreated NTA/EDTA.
• the present invention is a detergent composition which incorporates NTA/EDTA in an agglomerated form.
• the detergent formulations of the present invention can include a variety of different compositions for use in institutional or industrial cleaning applications. These compositions would include, but not be limited to, blends suitable for use as ware washing detergents, cutlery presoaks, all purpose cleaners, floor cleaners, sanitizers, disinfectants, descalers, oven/grill cleaners, degreasers and rinse aids. Although these vary widely in composition, they can all incorporate the agglomerated NTA/EDTA of the present invention.
• One example of the present invention will be a ware washing detergent.
• Such ware washing detergents preferably include a source of alkalinity (typically caustic, silicates or soda ash) , a hardness sequestering system, low molecular weight water-soluble polymers, nonionic and/or defoaming surfactants, processing aids and optionally bleaching sources.
• a source of alkalinity typically caustic, silicates or soda ash
• a hardness sequestering system typically include low molecular weight water-soluble polymers, nonionic and/or defoaming surfactants, processing aids and optionally bleaching sources.
• the hardness sequestering system of the present invention will primarily be formed from alkali metal salts of nitrilotriacetic acid and ethylenedinitrilotetraacetic acid.
• the detergent composition can also include alkali metal salts of gluconic acid, the alkali metal salts of citric acid, and even the phosphates.
• phosphates would generally not be incorporated with the detergent composition of the present invention in combination with NTA/EDTA.
• the hardness sequestering system will form from 10% to 50% by weight of the overall detergent composition and preferably 25% to 50% by weight.
• the NTA/EDTA is preferably agglomerated using a liquid component functionally active in the final detergent formulation.
• the NTA/EDTA is agglomerated using well-known chemical mixers which disperse a spray of liquid over the NTA/EDTA as it is being agitated. This eventually forms an agglomerated mass of the NTA/EDTA.
• the liquid used to agglomerate the NTA/EDTA will be an active detergent composition. This can, for example, include a surfactant, a defoaming agent, an aqueous solution of polycarboxylic acid and/or other detergent compositions which are dissolved in water such as polysilicates and the like.
• Suitable liquids also include functionally active components which are liquid at an application temperature. Functionally active components which can be melted and applied (such as waxy materials) can also be included.
• the most preferred liquid active detergent composition is selected from the group consisting of an aqueous solution of a polycarboxylic acid, surfactants, defoaming agents and mixtures thereof.
• An aqueous solution of a polycarboxylic acid being an especially preferred liquid for agglomerating the alkali metal salt of the present invention.
• liquids are combined onto the NTA/EDTA in an amount sufficient to agglomerate the NTA/EDTA and, at the same time, avoid the formation of a sticky mass.
• the rate of addition is typically controlled to allow any water or other solvent to evaporate off and/or be absorbed with the remaining liquid as it is mixed with the NTA/EDTA.
• about 10% to 30% by weight of liquid component will be added and ideally about 20%. This will, of course, vary depending upon the liquid employed. Further, generally at least a portion will be removed by evaporation.
• An apparatus suitable for agglomeration is disclosed US Patent 4,182,683. Other blending equipment which permits the liquid component to be uniformly mixed with NTA/EDTA powder will, of course, work.
• a detergent it is possible to either combine all of the liquid components together and add this mixture to the NTA/EDTA, or selectively add different liquid components.
• One preferred component which forms an agglomerated NTA/EDTA is the aqueous solution of polycarboxylic acid. This, when combined with the NTA/EDTA, forms an excellent agglomerate.
• the NTA/EDTA is preferably agglomerated to form particles having a size of 300 to 1500 microns or larger, and preferably 800-1500 microns. This will provide a free- flowing material which can be used as is or admixed with other similar active materials to form detergent blends having desirable properties and can be easily dispensed and/or further processed.
• Industrial and commercial ware washing detergents generally include a caustic source such as sodium or potassium hydroxide, with sodium hydroxide being preferred. Generally, these may be included at a level from about 0 to 70% by weight, with 30% to 55% being preferred. For a high caustic detergent composition, the caustic content will generally be from about 45% to 55% by weight.
• the present invention can optionally include a bleaching agent such as alkali metal perborates and percarbonates. This is added in amounts up to 20% by weight.
• the detergent composition can include defoaming agents, typically nonionic surfactants.
• the nonionic surfactant used herein is selected from the group including alcohol ethoxylates, block copolymers and mixtures thereof. Generally, these will have a molecular weight of 900 to about 4000.
• One such surfactant is an ethylene oxide, propylene oxide block copolymer.
• Commercially available surfactants include Tritan CF32,
• Tritan DF12 Plurafac LF131, Plurafac LF132, Plurafac LF231, Industrol N3, and Genepal PN30. These can be included in an amount from about 0.5% to about 5% with about 1.5% by weight preferred.
• the detergent formulation can also include other surfactants, generally anionic surfactants.
• Particular anionic surfactants include alkyl aryl sulfonate and alkyl aryl sulfate.
• the ether sulfates in particular could act as the agglomerating agents. These are present in an amount of 1 to 20% by weight .
• the detergent composition of the present invention can also include low molecular weight (2,000-20,000) , water soluble, polymeric acid such as polyacrylic acid, polymethacrylic acid or polymaleic acid or copolymers thereof . These are used as sequestering aids, to inhibit growth of calcium carbonate crystals and to improve rinsability.
• the water soluble polymer will be a polycarboxylic acid such as polyacrylic acid having a molecular weight of around 5000.
• the composition of the present invention should include 1% to 10% by weight polyacrylic acid on an actives basis, with 2-5% preferred. These are generally available in a 50% aqueous solution.
• the agglomerated NTA/EDTA can be dry mixed with other usually applied detergent components in amounts which meet the desired performance characteristics. These constituents are mixed to form effective powdered detergent formulations preferably including from 1% to 50% by weight of the chemical composition of the invention and a detergent builder. These powdered detergent formulations can be used in typical powdered detergent dispensers.
• the granulated NTA/EDTA is used to form a tableted detergent.
• the agglomerated NTA/EDTA is blended with the other solid detergent compositions and any remaining liquid components are separately combined and then sprayed onto this mixture of solid detergent components.
• the caustic is added last after the liquid has been sprayed onto the remaining blend.
• This formed detergent blend which preferably comprises a detergent builder and from about 1 to about 50% by weight of the chemical composition according to the invention, is then compressed to form tablets using a standard tableting machine.
• a standard tableting machine is a Stokes brand tableter.
• the powder is subjected to 4 to 10 tons pressure.
• the tablet will have a thickness of 6 to 7 mm and a diameter of about 20 mm. The maximum diameter will be a function of the dispenser/feed water interface area. Tablets must be able to fall down upon the dispenser interface.
• granularized NTA was formed by granularizing NTA crystals with an aqueous solution of Accusol 445, a water-soluble polyacryiate.
• the Accusol 445 was combined with sufficient water to make it easily sprayable and was then added to NTA crystals using a granulator.
• the granularized product was then dried and ready for use.
• the granularized NTA included 90% NTA and 10% polyacryiate solids. These were then formulated into the following detergents: a machine dishwashing detergent, a powdered presoak detergent, and an all-purpose powder detergent.
• Granular NTA (10% polyacryiate) 44.5% Soda Ash 9.50 mix 2 minutes, then slowly add:
• Nonionic surfactant [Industrol N3] 1.00 mix 5 minutes, then add:
• Granular NTA (10% polyacryiate) 22.00% Soda Ash 50.00
• Nonionic Surfactant [Neodol 91-6] 2.25 mix 5 minutes, then pack out into a capsule.
• Granular NTA (10% polyacryiate) 27.70%
• the detergents of the present invention can be placed in a container and dispensed.
• the optimum shape and configuration of the container will obviously vary, depending upon the particular dispenser.
• the agglomerated NTA/EDTA of the present invention can be used in a wide variety of tableted detergent compositions.

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

Applications Claiming Priority (3)

Publications (1)

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• 1997
  • 1997-02-10 EP EP97904405A patent/EP0880577A1/de not_active Withdrawn
  • 1997-02-10 AU AU17232/97A patent/AU713088B2/en not_active Ceased
  • 1997-02-10 BR BR9707279A patent/BR9707279A/pt not_active Application Discontinuation
  • 1997-02-10 WO PCT/EP1997/000594 patent/WO1997029175A1/en not_active Ceased
  • 1997-02-10 CA CA002243472A patent/CA2243472A1/en not_active Abandoned
  • 1997-02-12 ZA ZA971163A patent/ZA971163B/xx unknown

Non-Patent Citations (1)

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