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
  • C11D3/02—Inorganic compounds ; Elemental compounds
  • C11D3/12—Water-insoluble compounds
  • C11D3/124—Silicon containing, e.g. silica, silex, quartz or glass beads
  • C11D3/1246—Silicates, e.g. diatomaceous earth
  • C11D3/128—Aluminium silicates, e.g. zeolites
  • C11D3/1286—Stabilised aqueous aluminosilicate suspensions

Definitions

• the present invention relates to a stable aqueous zeolite dispersion.
• zeolites have an excellent ion exchange capability, adsorption capability, and other capabilities and, therefore, are industrially utilized as, for example, a detergent builder.
• Zeolites are generally produced in the form of an aqueous dispersion by a hydrothermal reaction, and are often handled as an aqueous dispersion from the viewpoints of transportation and handling.
• granulated detergents for garments e.g., clothes and fabrics
• an aqueous zeolite dispersion is prepared before mixing with a detergent slurry.
• aqueous zeolite dispersion is unstable because of the difference in the specific gravities of water and the zeolite. Therefore, the zeolite separates and settles in the aqueous dispersion when the aqueous dispersion is stored.
• Japanese Unexamined Patent Publication (Kokai) No. 5l-9l898 proposes that alkyl phospate esters, slightly water-­soluble nonionic surfactants, and sulfonate anionic surfactants be added to the aqueous zeolite dispersions
• Japanese Unexamined Patent Publication (Kokai) No. 54-l55200 proposes that water-soluble nonionic surfactants and compatible salts (e.g., inorganic sodium salts) be combined and added to the aqueous zeolite dispersions.
• these proposals still do not satisfy the stability requirements for a long term storage of the aqueous dispersion, or provide satis­factory handling properties.
• the objects of the present invention are to eliminate the above-mentioned disadvantages of the prior art and to provide an aqueous zeolite dis­persion having an excellent fluidity and good storage stability.
• an aqueous zeolite dispersion comprising 40% to 55% by weight, in terms of anhydride, of fine zeolite and 0.00l% to 0.l% by weight of a lipopolysaccharide produced by a microorganism belonging to sp. Acineto bactor .
• the zeolites usable in the present invention include natural and synthetic zeolites.
• Examples of the synthetic zeolites are type-A, type-X, and type-Y. Of these zeolites, the use of type-A zeolite is preferable from the builder standpoint.
• the average particle size of the zeolite is preferably 0.l to l0 ⁇ m, more pref­erably 0.5 to 5 ⁇ m, and the zeolite is formulated into the aqueous dispersion at a content of 40% to 55% by weight, preferably 44% to 50% by weight. A zeolite content of less than 40% by weight is not economically preferable.
• the solid content of a conventional detergent slurry is generally 35% to 40% by weight, the water content in the detergent slurry is increased, when an aqueous zeolite dispersion having a low solid concentration is added, and therefore, the spray drying load is unpreferably increased.
• the zeolite content is more than 55% by weight, it is difficult to treat the aqueous dispersion.
• the lipopolysaccharides prepared from microorganisms belonging to sp. Acineto bactor are so-called bio­surfactants, which are available from, for example, Petroferm (U.S.A.) under the trade name of "Emulsan".
• "Emulsan” is an extracellular microbiological protein associated with lipopolysaccharides, which is produced by a microorganism belonging to sp. Acineto bactor (deposited as ATCC No. 3l0l2).
• lipopolysaccharides examples include ⁇ -Emulsans (i.e., Neoemulsans ), which are produced when mainly ethanol is used as a carbon source, and ⁇ -Emulsans (i.e., Protoemulsans ), which are obtained when mainly crude oil or hexadecane is used as a carbon source.
• ⁇ -Emulsans i.e., Neoemulsans
• Protoemulsans i.e., Protoemulsans
• the lipopoly­saccharides produced by a microorganism belonging to sp. Acineto bactor are formulated into the aqueous zeolite dispersion in an amount of 0.00l% to 0.l% by weight, preferably 0.005% to 0.06% by weight.
• the content of the lipopolysaccharide is less than 0.00l% by weight, the stability of the resultant zeolite dispersion is reduced.
• the content of the lipopolysaccharide is more than 0.l% by weight, handling of the resultant aqueous zeolite dispersion becomes difficult because the viscosity of the dispersion is increased and the fluidity thereof is reduced.
• aqueous zeolite dispersion according to the present invention may optionally contain any conventional optional detergent ingredients (e.g., anionic surfactant, sodium sulfate, sodium carbonate, sodium citrate, sodium silicate) unless the stability of the dispersion is adversely affected.
• optional detergent ingredients e.g., anionic surfactant, sodium sulfate, sodium carbonate, sodium citrate, sodium silicate
• the aqueous zeolite dispersion having a high fluidity even at a low temperature and an excellent storage stability can be advantageously obtained by adding thereto the lipopoly­saccharides produced by a microorganism belonging to sp. Acineto bactor .
• Aqueous zeolite dispersions i.e., sample Nos. l to 5 in Table l having the following formulations were prepared.
• the viscosity of the resultant aqueous zeolite dispersion was determined and the settling stability of the resultant aqueous zeolite dispersion was evaluated after storage, by a stability test.
• the viscosity was determined at 20 r.p.m. at a temperature of 25°C by using a B-type viscometer (i.e., a Brookfield type visometer).
• a sample dispersion was taken in a glass bottle.
• the bottle was sealed and was allowed to stand at a temperature of 25°C.
• the stability after one day was determined.
• the upper clear transparency layer in the bottle was visually evaluated, and the lower settled gel product was determined in terms of % by volume, as follows. That is, a glass plate having a diameter of 5 mm was quietly and vertically placed in the lower settled gel product layer from the top of the glass bottle. When the glass plate came to the settled gel product, the length of the glass plate was determined. The volume percentage based on the total volume was calculated from the length of the glass plate.
• the storage stability was good when the volume percentage of the upper layer was 30% by volume or less, and when the volume percentage of the lower layer was l% or less after storage for 9 days.
• the results were evaluated in terms of the number of days for which the dispersion was maintained.

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• Chemical & Material Sciences (AREA)
• Life Sciences & Earth Sciences (AREA)
• Organic Chemistry (AREA)
• Engineering & Computer Science (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Wood Science & Technology (AREA)
• Health & Medical Sciences (AREA)
• Emergency Medicine (AREA)
• Molecular Biology (AREA)
• Inorganic Chemistry (AREA)
• Silicates, Zeolites, And Molecular Sieves (AREA)
• Detergent Compositions (AREA)
• Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
• Cosmetics (AREA)

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Publications (3)

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Citations (3)

• 1986
  • 1986-01-17 JP JP61007328A patent/JPS62167216A/ja active Pending
• 1987
  • 1987-01-12 DE DE8787300244T patent/DE3763595D1/de not_active Expired - Fee Related
  • 1987-01-12 EP EP87300244A patent/EP0233689B1/de not_active Expired - Lifetime
  • 1987-01-12 AT AT87300244T patent/ATE54467T1/de not_active IP Right Cessation

Patent Citations (3)

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