Classifications

• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
  • C11D3/02—Inorganic compounds ; Elemental compounds
  • C11D3/04—Water-soluble compounds
  • C11D3/046—Salts
• • 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
  • C11D17/0091—Dishwashing 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
  • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
  • C11D3/0005—Other compounding ingredients characterised by their effect
  • C11D3/0073—Anticorrosion compositions
• • 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
  • C11D3/39—Organic or inorganic per-compounds
  • C11D3/3942—Inorganic per-compounds
• • C—CHEMISTRY; METALLURGY
  • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
  • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
  • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
  • C11D3/39—Organic or inorganic per-compounds
  • C11D3/3945—Organic per-compounds

Definitions

• the present invention relates to an automatic dishwashing composition
• an automatic dishwashing composition comprising an oxygen donating bleach and ingredients conventional for dishwashing compositions including optionally further conventional adjuvants and/or fillers.
• the automatic dishwashing compositions tend to develop more and more towards chlorine-free, non-corrosive automatic dishwashing compositions containing oxygen donating bleaches.
• Such automatic dishwashing compositions include SUN PROGRESS which is a pulverulent, phosphate-free, chlorine-free and non-corrosive automatic dishwashing composition available from Lever, Germany, and Milde Kraft which is also a phosphate-free and chlorine-free, non-corrosive pulverulent product which is marketed in Germany by Benckiser.
• Such oxygen-donating bleaches are encumbered with some drawbacks especially in connection with silver cutlery, as silver oxidation compounds are formed by corrosion during the dishwashing process, said compounds resulting in a discoloured yellowish or brownish surface covered by a loose white dust-like layer. This tendency is more or less pronounced for all the products presently on the market which are based on oxygen donating bleaches.
• the present invention relates to an automatic dishwashing composition
• an automatic dishwashing composition comprising an oxygen donating bleach and ingredients conventional to automatic dishwashing compositions including possible further conventional adjuvenat and/or fillers, said automatic dishwashing composition being characterised by comprising a silver corrosion inhibitor selected among ammonium compounds.
• the automatic dishwashing compositon according to the invention may particularly advantageously be used when a formulation in the form of a tablet is desired where the problems of silver corrosion are often especially pronounced.
• any compound capable of releasing ammonium ions may advantageously be used as a silver corrosion inhibitor.
• Examples of advantageous silver corrosion inhibitors capable of releasing ammonium ions include compounds selected from the group consisting of ammonium chloride, ammonium bromide, ammonium sulphate, diammonium hydrogencitrate and mixtures thereof.
• the automatic dishwashing composition according to the invention comprises advantageously the silver corrosion inhibitor in an amount of at least 0.03, preferably at least 0.7, and most preferred at least 1.5 parts by weight of corrosion inhibitor, calculated as ammonium chloride, per part by weight of active oxygen, calculated as O2, releasable from the oxygen donating bleach, and advantageously not more than 10.5, particularly preferred not more than 6.5 and most preferred not more than 5.3 parts by weight of silver corrosion inhibitor, calculated as ammonium chloride, per part by weight of active oxygen.
• the oxygen donating bleach contained in the automatic dishwashing composition may advantageously be a per-compound or a perhydrate or mixtures thereof.
• the recipe is based on trade products and not on 100% active and anhydrous ingredients.
• the essential feature of the present invention is that the discolouration and deposit of dust on silver can be avoided, which presents a pronounced problem in connection with a high content of oxygen donating bleaches.
• a high content of oxygen donating bleaches is usually necessary in automatic dishwashing compositions in the form of tablets in order to ensure a sufficiently fast bleaching effect.
• Examples of possible oxygen donating bleaches in question include perhydrates and per-compounds as well as mixtures thereof.
• the perhydrates include preferably alkali metal compounds of perborates which may be present in the form of tetra- and monohydrates, perborax, percarbonates, persilicates, citrate perhydrates and perhydrates of urea and melamine compounds.
• acidic persalts such as persulphates (e.g.
• perbenzoates and peroxycarboxylic acids such as peroxyphthalate, magnesium monoperoxyphthalic acid, diperoxyphtalic acid, 2-octyl-diperoxysuccinic acid, diperoxydodecane dicarboxylic acid, diperox- yazelaic acid, imidoperoxycarboxylic acid, as well as salts and mixtures of such.
• Sodium percarbonate and sodium perborate can be mentioned as particularly preferred bleaches.
• the content of the oxygen donating bleach is usually of an amount corresponding to 0.4 to 5.3 parts by weight of active oxygen per 100 parts by weight of dishwashing compositon, which corresponds to about 3 to 39 parts by weight of sodium percarbonate per 100 parts by weight of the diswashing composition in the case of sodium percarbonate containing 13.5% by weight of active oxygen.
• Any compound may be used a silver corrosion inhibitor provided said compound releases ammonium ions in the washing liquor and is active in forming stable silver complex salts while at the same time not having a detrimental effect on the cleaning performance.
• the other ingredients of the automatic dishwashing compositon according to the invention may be selected among ingredients conventional for automatic dishwashing compositions, under the condition, of course, that such ingredients are compatible with the oxygen donating bleach and the silver corrosion inhibitor used.
• suitable automatic dishwashing compositions by combining an oxygen donating bleach and a silver corrosion inhibitor on the basis of the instructions given in the present application and to select the remaining ingredients of the automatic dishwashing composition on the basis of the prior art.
• the automatic dishwashing composition according to the invention is manufactured in the form of tablets to be used in a dosage of, for instance, one or two tablets per wash cycle.
• the manufacture of tablets usually require addition of adjuvants, for instance in the form of starch, glycerol, polyethylene glycol, preferably of a molar weight of 100-10,000, polyvinyl pyrrolidone (PVP), polyvinyl polypyrrolidone (PVPP) or a stearate compound, such as sodium stearate.
• adjuvants for instance in the form of starch, glycerol, polyethylene glycol, preferably of a molar weight of 100-10,000, polyvinyl pyrrolidone (PVP), polyvinyl polypyrrolidone (PVPP) or a stearate compound, such as sodium stearate.
• PVP polyvinyl pyrrolidone
• PVPP polyvinyl polypyrrolidone
• stearate compound such
• a basic powderfraction which comprises the solid ingredients of the automatic dishwashig composition, which for instance in the following recipe 1 according to Example 1 comprises bleach, bleach activator, polycarboxylate, polyfunctional carboxylic acid, silicate, enzymes, silver corrosion inhibitor and sodium carbonate.
• the fluid ingredients usually comprising liquid tensides, are sprayed thereon, whereupon one or more tableting adjuvants can be sprayed on or added followed by a final mixing for 2 to 10 min.
• the resulting powder mix is compressed to tablets of a diameter of, for instance, 32 mm in a tablet press (e.g. Fette Perfecta 4B).
• the thickness of the manufactured tablets depends on the desired tablet weight and the formulation and is usually in the range of 13 to 20 mm. Further examples of the manufacturing of tablets are disclosed in DE-PS No. 355,626, US-PS No. 328,880 and DE-PS No. 3,827,895.
• the automatic dishwashing composition comprises:
• a second embodiment of the invention, where the automatic dishwashing composition is in a pulverulent form, is as follows:
• bleach activators include N-acyl compounds and O-acyl compounds, such as acylated amines, diamines, amides, acylated glycoluriles, N-acylated cyclic hydrazides, triazoles, urazoles, diketopiperazines, sulphuryl amides, cyanurates and imidazolines, carboxylic acid anhydrides, acylated sugar compounds, acylated ester compounds etc.
• N-acyl compounds and O-acyl compounds such as acylated amines, diamines, amides, acylated glycoluriles, N-acylated cyclic hydrazides, triazoles, urazoles, diketopiperazines, sulphuryl amides, cyanurates and imidazolines, carboxylic acid anhydrides, acylated sugar compounds, acylated ester compounds etc.
• TAED tetraacetyl methylene diamine
• TAED tetraacetyl ethylene diamine
• TAGU tetraacetyl glycoluril
• PAGE pentaacetyl glucose
• NOBS nonanoyloxybenzene sulphonate
• TAED is most preferred, TAED being available as a granulate having an active content of 85 to 95% by weight.
• the bleach activators are described in greater detail in GB-PS No. 2,040,983 and GB-PS No. 1,473,201.
• polycarboxylate used examples include polymerisates of acrylic acid, hydroxyacrylic acid, maleic acid, itaconic acid, metaconic acid, aconitic acid, methylene malonic acid, citraconic acid etc., as well as co- polymerisates of said carboxylic acids either with each other or with other ethylenically unsaturated compounds, such as ethylene, propylene, isobutylene, vinyl alcohol, vinylmethyl ether, furane, acrolein, vinyl acetate, acrylamide, acrylonitrile, methacrylic acid or crotonic acid.
• the molecular weight of the polycarboxylate may be in the range of 1,000 to 1,000,000, preferably 2,000 to 100,000 and most preferred 7,000 to 30,000.
• the weights stated forthe polyfunctional carboxylic acid referto anhydrous citric acid.
• Usable polyfunctional carboxylic acids may generally be defined as such acids which in addition to the one requisite carboxylic acid group also contain at least one further functional group selected among carboxyl and hydroxy. Moreover, nitrogen may also be incorporated in the molecule in some cases.
• examples of such polyfunctional carboxylic acids include NTA, EDTAand isoserine diacetic acid of the formula (CH 2 COOH) 2 N-CH 2 CHOHCOOH.
• Tablets of a weight of 18.0 g, a diameter of 32.0 mm, and a height of 15.0 mm were manufactured on the basis of the following recipe.
• Ammonium chloride was used as silver factor (SF).
• Tablets of a weight of 18.0 g, a diameter of 32.0 mm, and a height of 15.0 mm were manufactured on the basis of the following recipe.
• Ammonium chloride was used as silver factor (SF).
• the present example illustrates a comparison test carried out on automatic dishwashing compositions according to the invention in the form of tablets containing 10% and 5% of silver factor in the form of ammonium chloride as stated in Examples 1 and 2, a recipe corresponding to the recipe given in Example 1, however without the content of silver factor (recipe A); and on a leading pulverulent product on the market "MILDE KRAFT" (recipe B) based on an oxygen donating bleach.
• the recipe without silver factor is as follows:
• a scale from 0 to 4 was used, where 0 indicates no discolouration or no dust deposit, respectively, and 4 indicates extensive discolouration and extensive dust deposit, respectively.
• the automatic dishwashing compositions according to the invention are superior in presenting a substantially reduced corrosion of silver cutlery.
• total scores of from 6 to 13 are obtained for the automatic dishwashing compositions according to the invention (recipe 1 and 2) at a water hardness of 20° dH.
• MILDE KRAFT (recipe B) represents the best phosphate-free and chlorine-free, non-corrosive pulverulent product on the market, and when used in a dosage of 25 g this product causes a substantially stronger corrosion in form of dust deposits and discolouration, the total score being 15.
• recipe A where the total score is also 15.
• the present Example illustates a comparison test carried out on automatic dishwashing compositions in the form of tablets according to the invention on the one hand and on tablets according to recipe Aand MILDE KRAFT (recipe B) on the other hand.
• corrosion of silver spoons was determined as stated in Example 3 as well as the cleaning performance on steel cutlery and other tableware soiled in accordance with the guidelines stipulated by the IEC (International Electrotechnical Commission).
• This recipe corresponds to recipe 1 withthe exception that anhydrous monosodiumcitrate has been used as solubilizer instead of citric acid.
• This recipe corresponds to recipe 1 with the exception that diammoniumhydrogen citrate has been used as silver factor instead of ammonium chloride.
• This recipe corresponds to recipe 1 with the exception that ammonium sulphate has been used as silver factor instead of ammonium chloride, and that this recipe uses TAED with the trade name TAED ATC available from the firm of Warwick International Ltd., Mostyn, North Wales instead of TAED supplied by Hoechst.
• This recipe corresponds to recipe 1 with the exception that ammonium sulphate has been used as silver factor instead of ammonium chloride.
• the determination of the cleaning performance was carried out on steel cutlery and on other tableware, i.e. cups, plates, glasses etc, soiled in accordance with the guidelines stipulated by the IEC (International Electrotechnical Commission). Thus the steel cutlery and the othertableware were washed together with the silver spoons.
• IEC International Electrotechnical Commission
• the automatic dishwashing compositions according to the invention are superior with respect to a reduced corrosion of the silver cutlery.
• ammonium sulphate as silver factor (recipes 5 and 6) entails a very large ability to prevent loose dust deposits while the ability to prevent discolouration is less favourable compared to ammonium chloride (recipe 1).
• the automatic dishwashing compositions according to the invention (the recipes 1 to 6) and recipe A and recipe B disclose largely the same performance as to tea-containing stains. As to non-tea containing stains and the total score, no significant difference appears either. As regards the cleaning performance, the automatic dishwashing compositions according to the invention are thus satisfactory and comparable with the best products on the market.

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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)
• Inorganic Chemistry (AREA)
• Health & Medical Sciences (AREA)
• Emergency Medicine (AREA)
• Detergent Compositions (AREA)

Applications Claiming Priority (3)

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ID=8108458

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Cited By (8)

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• 1991
  • 1991-11-08 DK DK184091A patent/DK167364B1/da not_active IP Right Cessation
• 1992
  • 1992-11-04 DE DE1992628223 patent/DE69228223T2/de not_active Expired - Fee Related
  • 1992-11-04 EP EP92610076A patent/EP0541475B1/fr not_active Expired - Lifetime

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