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
  • C11D3/37—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
  • C11D3/3761—(Co)polymerised carboxylic acids, -anhydrides, -esters in solid and liquid compositions in solid compositions

Definitions

• the invention relates to water-soluble, powdery cleaning agents for hard surfaces, which are particularly suitable for dishwashers.
• US Pat. No. 3,922,230 describes the use of alkylimetal, ammonium or substituted ammonium salts of polyacrylic or polymethacrylic acids with a molecular weight of 500 to 10,000, preferably less than 5000, as builders or detergent boosters for water-soluble, powdery cleaning agents. So-called builders known, which can be used alone or in conjunction with other builder substances in the cleaning agents.
• water-soluble, powdered cleaning agents for hard surfaces, in particular dishes, cutlery and other kitchen appliances, in automatic dishwashers based on alkaline carrier materials, alkali-resistant non-ionic surfactants and conventional additives such as bleaching agents (peroxide compounds), biocides, fragrances , Anti-foaming agents and / or solubilizers that are characterized by a content of polycarboxylic acids and / or their salts with a molecular weight of 12,000 to 40,000, preferably from 15,000 to 28,000 and preferably from 19,000 to 22,000.
• the polycarboxylic acids and / or their salts are present in an amount of 1 to 8, preferably 2.5 to 4 percent by weight, based on the total weight of the cleaning agent.
• the polycarboxylic acids expediently have about 100 carboxyl groups in the molecule, especially if they are used in the form of their salts.
• Preferred polycarboxylic acids are those in which there are 1 to 3, preferably 2, carbon atoms between two carboxyl groups.
• Suitable polycarboxylic acids are primarily polyacrylic acids, polymethacrylic acids and polymerization products of maleic acid and / or their anhydride and / or fumaric acid and ethylene and / or propylene.
• Preferred salts of these polycarboxylic acids are the alkali metal, ammonium and substituted ammonium salts, especially the sodium salts.
• Preferred substituents for the substituted ammonium salts are alkyl groups with 1 to 3 carbon atoms, which may have hydroxyl groups as further substituents.
• the alkaline carrier materials contained in the cleaning agents according to the invention are known as such and include water-soluble citrates, such as trisodium citrate, and silicates, such as sodium metasilicates, and alkali metal carbo nates and hydroxides.
• ethylene and / or propylene oxide addition products on fatty alcohols with 12 to 18 carbon atoms or on oxo alcohols with 10 to 15 carbon atoms have proven to be advantageous.
• Addition products of 6 to 8 moles of ethylene oxide and 3 to 6 moles of propylene oxide with alcohols having 12 to 15 carbon atoms are particularly preferred.
• customary additives such as bleaching agents, in particular peroxide compounds such as percarbonates, perborates or magnesium peroxyphthalate, fragrances, customary biocides, antifoam agents, buffer substances and / or solubilizers such as sodium sulfate can be added to the cleaning agents in customary amounts.
• the use of the polycarboxylic acids and / or their salts improves the soil solution, the soil dispersing capacity and the fluidity in such a way that under normal washing liquor conditions a greatly improved cleaning power and even with a reduced washing liquor and with a reduced alkali circuit the normal cleaning power is maintained or even improved.
• Another advantage can be seen in the fact that the addition of a polycarboxylic acid and / or its salts with the stated molecular weights allows the use of lower rinse temperatures than has been the case up to now.
• Another object of the present invention is a process for the preparation of the cleaning agents, which is characterized in that an alkali-resistant non-ionic surfactant is sprayed onto an alkaline carrier material in a mixing device, preferably a powder mixer, and a polycarboxylic acid and / / or their salt with a molecular weight of 12,000 to 40,000.
• the surfactant is preferably sprayed into the mixing device through an angle nozzle of 60 ° to 140 °, preferably 70 ° to 95 °, perpendicular to the mixing direction.
• the per se highly hygroscopic polycarboxylic acid and / or its salt is drawn into the carrier material by means of the surfactant and sealed there, so that a free-flowing powder is obtained which does not cause clumping or crusting during filling.
• segregation when storing the cleaning agents is avoided.
• the other substances can be fed to the mixing device.
• sodium percarbonate 5 to 25 percent by weight sodium perborate or 3 to 10 percent by weight magnesium monoperoxyphthalate can also be used.
• 0.5 to 1.5 percent by weight of chlorine-releasing substances and / or 5 to 10 percent by weight of peroxide compounds can be added as further additives.
• the tripolyphosphate can be replaced by sodium citrate up to 10 percent by weight.
• Example 1 The recipe of Example 1 is repeated, but 8 parts by weight of sodium perborate are used instead of sodium percarbonate.
• Example 1 The recipe of Example 1 is repeated, but 5% by weight magnesium monoperoxyphthalate is used instead of sodium percarbonate.
• Example 4 is repeated, but instead of pentasodium tripolyphosphate the formulation contains a mixture of equal parts of pentasodium tripolyphosphate and trisodium citrate and an additional 6 percent by weight sodium percarbonate
• Example 5 The recipe of Example 5 is repeated, but with a content of 0.5 percent by weight 1,3-dichloro-5,5-dimethylhydantoin instead of 1 percent by weight of the sodium salt of dichloroisocyanuric acid.
• a powder mixer is charged with 500 parts by weight of carrier material (sodium citrate and / or sodium metasilicate) and rotated.
• carrier material sodium citrate and / or sodium metasilicate
• the required amount of surfactant is sprayed onto the carrier material from an angle nozzle, which is arranged at an angle of 80 ° perpendicular to the mixing direction.
• the desired amount of the polycarboxylic acid is added to the powder mixer. After the polycarboxylic acid has been drawn into the carrier material with the aid of the surfactant, the remaining constituents of the desired formulation are introduced into the powder mixer.
• This procedure has the advantage that the start hygroscopic polycarboxylic acid is sealed in the carrier material by means of the surfactant and is therefore protected from the attack of atmospheric moisture.
• polycarboxylic acid 60 parts by weight of polycarboxylic acid and 20 parts by weight of surfactant are premixed in a separate powder mixer until the mixture has a dry consistency. Then this premix is added to the main mixer with approx. 500 parts by weight of carrier material (e.g. pentasodium tripolyphosphate, trisodium citrate and / or sodium silicate).
• carrier material e.g. pentasodium tripolyphosphate, trisodium citrate and / or sodium silicate.
• carrier material 50 parts by weight of carrier material, 60 parts by weight of polycarboxylic acid and 20 parts by weight of surfactant are added to a separate powder mixer and these substances are mixed to a dry consistency.
• This premix is added to the main mixer to 450 parts by weight of the alkaline carrier material (e.g. pentasodium tripolyphosphate, trisodium citrate and / or alkali silicate) and mixed in well. The remaining ingredients are then mixed in.
• the alkaline carrier material e.g. pentasodium tripolyphosphate, trisodium citrate and / or alkali silicate

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Cited By (11)

Citations (3)

• 1984
  • 1984-07-19 EP EP84108518A patent/EP0132792A1/fr not_active Withdrawn

Patent Citations (3)

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