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
  • C11D3/20—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
• • 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
  • C11D3/395—Bleaching agents
  • C11D3/3951—Bleaching agents combined with specific additives

Definitions

• Detergents for automatic dishwashing in particular in households, are known to contain alkali phosphates, alkali silicates as well as small amounts of alkali carbonates and / or alkali sulfates as main cleaning ingredients.
• small amounts of active chlorine-releasing compounds are usually contained, which are specially designed for bleachable soiling, e.g. Tea, coffee or fruit and vegetable juices work. Until now, these most important of all active ingredients can hardly be dispensed with.
• the foam in the cleaning liquor considerably delays the ability of the detergent to be rinsed out of the dosing device of the HGSM, which leads to a loss in performance of the detergent.
• air can be drawn in by the cleaner circulation pump through increased foaming, which causes the pump pressure to drop and the cleaning performance to be reduced.
• the combination with b) also leads to an increased degradation of active chlorine with a simultaneous loss of the foam-inhibiting action, the added benefit of the foam-inhibiting compounds being almost canceled out by the presence of compounds which release active chlorine.
• the combination with c) leads to mutual influence and cancellation of the individual effects. This has repeatedly led to the search for a solution to this problem. The most varied of paths have been followed and described.
• the object of the invention was therefore to demonstrate a new way which makes it possible to stabilize at least the additional active substances mentioned with respect to the compounds which release active chlorine.
• German Auslegeschrift 16 17 088 it is known that the addition of white paraffin oil to dry mixtures of alkali phosphates and silicates, nonionic surfactants and active chlorine carriers improves the storage stability of the cleaning agents, which is achieved in particular by good, i.e. low foam values are documented.
• the invention therefore relates to powdered, chlorine-containing, machine-applicable dishwashing detergents based on alkali metal triphosphates, alkali metal silicates and / or alkali metal carbonates and / or alkali metal sulfates, low-foaming nonionic surfactants and optionally other active chlorine-sensitive compounds, which are characterized in that they contain an addition of 0.005 to 0.5 , preferably 0.01 to 0.15 percent by weight, based on the total detergent, of polysaccharides.
• the amount added is thus at the lower limit or far below the amounts which are customarily used in the known addition of these substances as thickeners for liquid or liquefied active chlorine-free cleaning agents (for example US Pat. No. 4,260,528, US Pat. No. 4,226,736, WO 83 / 3621, DE-OS 33 01 577).
• the addition is made by dry mixing the powdered detergent components together in known devices.
• Xanthan gum is here based on Römpps Chemie-Lexikon, 7th edition (1973), pages 1355 and 1356 and Kirk-Othmer “Encyclopedia of Chemical Technology", 3rd edition (1980), volume 12, pages 62 to 64 understood a product that is known under the Anglo-Saxon name “Xanthan Gum”.
• Xanthan gum is a high molecular weight polysaccharide, i.e. an exocellular heteropolysaccharide with a molecular weight of about 2,000,000 to 10,000,000 and higher, which is produced by various types of Xanthomonas, for example Xanthomonas campestris. They are hydrophilic colloids. Numerous publications deal with their production by aerobic propagation and cultivation of bacteria of the genus Xanthomonas in aqueous nutrient media. The basic work is described in U.S. Patent 3,000,790.
• Kelco Comp. Oklahoma / USA sold under the name Kelzan ® and described in Kelco "Xanthan Gum", 2nd edition (1975).
• Alginates preferably the sodium salts of alginic acid with molecular weights of about 100,000 to 240,000, are also known from the Kelco Comp. sold under the name Kelco-gel®.
• the alkali metal salts of pentaalkali metal tri-phosphate are used anhydrous or as hexahydrate and any mixtures of the two forms in amounts of 5 to 60, preferably 10 to 55, percent by weight, based on the total mixture of the cleaning agent, as alkali metal triphosphates.
• Their proportion in the total mixture of the cleaning agent is 10 to 60, preferably 15 to 50 percent by weight, based on the anhydrous compounds.
• alkali carbonates Small amounts are usually added as additional alkali donors.
• the amount used is 0 to 15, preferably 1 to 10 percent by weight.
• the sodium salt is preferably used.
• cleaning-inactive inorganic salts such as alkali sulfates, preferably sodium sulfate, can also be added to stretch the formulation. These are then by amounts from 0 to 15, preferably from 1 to 10 percent by weight.
• the cleaning agents according to the invention can also contain other inorganic phosphate substitutes in combination with the triphosphate used.
• the preferred inorganic phosphate substitutes include the synthetically produced water-insoluble zeolites of the NaA or NaX type, as are described, for example, in US Pat. Nos. 2,882,243 and 2,882,244. They are used in amounts of 3 to 50, preferably 5 to 35 percent by weight, based on the total cleaning agent.
• the zeolites have an additional corrosion-inhibiting effect with regard to decorative glazes on porcelain or ceramic, which goes beyond that of the known tripolyphosphate / metasilicate mixtures.
• zeolites can optionally also be processed further in the form of storage-stable, free-flowing aqueous suspensions with the highest possible zeolite content, that is to say incorporated into detergent formulations. It is advantageous to add so-called stabilizers to the suspensions to optimize their storage and transport stability.
• stabilizers for this purpose, according to DE-OS 34 08 040, an addition of 0.01 to 0.25 percent by weight, based on the total aqueous zeolite suspension to be stabilized, of xanthan gum has been proposed.
• xanthan gum additives in particular also in the case of zeolite-free detergent compositions, are suitable for protecting organic compounds against the attack of active chlorine-releasing compounds.
• the active chlorine-releasing compounds include the chlorine derivatives of isocyanuric acid, preferably trichloroisocyanuric acid and sodium dichloroisocyanurate and its dihydrate. The amounts added are 0.2 to 5, preferably 0.2 to 2.5 percent by weight.
• Known low-foaming nonionic surfactants a) suitable for the preparation of the cleaning agents according to the invention are addition products of ethylene oxide with alkylphenols and preferably fatty alcohols based on coconut oil or tallow fat, i.e. with an alkyl chain length of 12 to 18 carbon atoms and their analog, petrochemically obtained compounds which have preferably been reacted with ethylene oxide and optionally also with propylene oxide. They are used in amounts of 0.2 to 3, preferably from 0.2 to 2.0 percent by weight.
• Possible foam-inhibiting compounds b) to be added are the paraffin-containing defoaming compositions mentioned in German Offenlegungsschrift 34 00 003. These are physical mixtures of pyrogenic hydrophobicized silica and paraffin waxes which are solid at room temperature or paraffin wax mixtures as a dispersion in liquid or as a composition on solid support materials. Their concentration is 0 to 5, preferably 0.05 to 5 and in particular 0.5 to 5 percent by weight.
• Suitable cleaning-enhancing additives c) are the compounds mentioned in German Offenlegungsschriften 34 28 833, 34 28 834 and 34 28 848 of the type of the terminal or internal epoxyalkanes which are reacted with mono- or diethanolamine and were optionally ethoxylated or propoxylated, the primary, straight or branched chain C8-C10- Alkanols, which can optionally be propoxylated or primary C8-C18 alkyl amines, which can optionally be alkoxylated or quaternized. Their amount then amounts to 0.1 to 10, preferably 0.2 to 5 percent by weight.
• the raw materials were mixed together with water in a Lödige mixer until a homogeneous agglomerate was formed, which was then dried in an air stream of 80 ° C. to the stated water and residual moisture content.
• this recipe can also be mixed with granular, possibly water-containing raw materials.
• the liquid components were sprayed onto this basic formulation in a known manner.
• the powdery polysaccharide was added before the powdery or granulated active chlorine carrier was added.
• This example shows the foam behavior of the detergent formulations that in the presence of an active chlorine carrier and a non-ionic surfactant, the latter being significantly less destroyed in the presence of a polysaccharide.
• the cleaning agent containing xanthan gum behaved significantly in the foaming behavior cheaper than the xanthan gum-free. In some cases, the values were almost as favorable as for the active chlorine-free formulation 2 a.
• the cleaning agents were stored in the drying cabinet at 40 ° C and in the climate cabinet at 40 ° C and 80% RH for 24 weeks.
• the active chlorine content was checked after storage. The results are summarized in Table 5 below.
• the defoamer was liquid and consisted of 95.0 parts by weight of 2-n-octyldecanol, 0.5 part by weight of petroleum jelly, 1.7 parts by weight of paraffin wax with a setting point of 42 to 44 ° C, 2.2 parts by weight of a microcrystalline wax with a setting point of 85 to 86 ° C and 0.6 part by weight of hydrophobicized silica, as described in DE-OS 34 00 003.

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Citations (6)

• 1986
  • 1986-03-08 DE DE19863607673 patent/DE3607673A1/de not_active Withdrawn
• 1987
  • 1987-03-02 EP EP87102916A patent/EP0236900B1/fr not_active Expired - Lifetime
  • 1987-03-02 DE DE8787102916T patent/DE3762883D1/de not_active Expired - Fee Related

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