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
  • C11D17/00—Detergent materials or soaps characterised by their shape or physical properties
  • C11D17/0039—Coated compositions or coated components in the compositions, (micro)capsules
• • 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
  • C11D3/0047—Other compounding ingredients characterised by their effect pH regulated 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
  • C11D3/02—Inorganic compounds ; Elemental compounds
  • C11D3/04—Water-soluble compounds
  • C11D3/10—Carbonates ; Bicarbonates
• • 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

Definitions

• the present invention relates detergent compositions and more particularly a detergent composition which is better suited for various purposes than prior art detergent compositions.
• detergent cornpositions when dissolved in water exhibit a pH value which is at or moderately above the neutral point, e.g. within the range of- 7 to 9. This applies e.g. in the case of dish-washing compositions, since at higher pH values fatty substances; lccithin's etc. present'in the skin are saponified, so that the skin becomes dry. Thus, a composition tending to give a lower pH value is milder to the hands of the user.
• Another case where a low pH is desirable is the washing of painted surfaces because more strongly alkaline agents may have a degrading effeet on substances present in the paint. Another application where a low pH.
• the main objectof the present invention is to provide a detergent composition which in aqueous solution at a lower temperature, eg. up to about 50 or 60 C., maintains a pH within the range of about 7.5 to 9.5, preferably about 8.5, during at least a substantial period of time, l' 'zrt'after some time of residence at a higher temperature (cfg. about 80 to 100' C.) obtains a pH within the range of about 9.5 to 11 preferably 10 to 10.5.
• This object is realized by incorporating magnesium oxide in the composition.
• the invention is broadly applicable to detergent compositions corny-rising as the active detersive ingredient a synthetic detergent of anionic or nonionic type.
• anionic detergents which may be used in compositions embodying this invention, include alkyl aryl- "atoms, such as lruryl sulfate or lauryl' sulfonate; and higher fatty r-cio amides, in which the acyl group contains from 8 to 20 carbon atoms, such as tallow fatty facid amide, cocoa fatty acid amide and the like.
• fire .sulfonates and sulfates referred to above are commonly times the amount of magnesium oxide or to 40% by sodium sulfonates, although the corresponding salts of ammonium or organic bases, such as, e. ethanol amine,
• nonionic detergents which may be included in compositions 'acoording to'this invention, include polyglycol others of higher aliphatic alcohols and polyglyc'ol others of higher fatty acids, inwhich thealcohol group and the fatty acid group respectively compr'ues from 8 to 20 carbon atoms and which contain to 50 ethylene oxide (CH,CH O) units per molecule.
• anionic and nonionic synthetic detergents of the above and other types and processes of preparing them are well-known in the art and described in the technical and patent literature. It will be understood that insofar as the present invention is concerned the type of detergent is not essential, since the pH increase centemplated by this invention is not dependent on the detergentused.
• the amount of nonionic or anionic synthetic detergent will usually be about to 50% by weight of the detergent composition, preferably about 15 to (on a dry basis).
• the detergent compositions contemplated by this invention comprise an alkali metal phosphate which acts as a builder.
• alkali metal phosphate which may be used there may be mentioned sodium or potassium salts of ortho, meta, poly and pyro-phosphoric acids, e.g. sodium hemmetaphosphate, sodium pyrophosphate, sodium triwlyphosphate (Na l O disodiurn orthophosphate etc.
• the amount of phosphate will usually be about 25 to I by weight of the detergent composition (on a dry basis).
• a detergent composition of the type above referred to containing anonionic or anionic synthetic deurgent ands phosphate and formulated so that its pH when dissolved in water is within the range of to 9.5 may be imparted the characteristic of rapidly obtaining a pH of 9.5 to 11 when the solution is heated (eg. to to (I), while no or at least only a slow increase in pH occursat room temperature or slightly elevated temper-attire (e.g. up to 60' C.), by incorporating magnesium oxide in the composition. When the solution is heated, the magnesium oxide reacts with the alkali metal phosphate to.
• the amount of magnesium oxide may be about l to 10% by weight of the detergent esmpositiontcn a dry basis).
• the desired eficct may be improved with respect to the constancy of the pH value at a lower temperature in two difi'erent ways.
• an alkali metal bicarbonate is incorporated in addition to the magnesium w p i g yr the alkali metal bicarbonate minimines the increase in pH at a lower temperature but doea not prevent the dsired pH increase at a higher temperature.
• the amount of bicarbonate may be about 5 to 20 weight of the detergent composition (on a dry basis).
• the magnesium" oxide is added in the form of a powder the individual W particles of which are coatedwith a substance which melts and is dispersed or dissolved in the washing eoluat about $0 to 60 C, whereby the magnesium oxide ,L.
• the resulting slurry stances having a similar effect areiethylene oxide nddt- 18 i mym 0 f Md tion products of the above-mentioned fatty alcohols com- 250 k; of h powder are mixed i h 57 k; f 4m 1 G -2- 1 l0 4 l Oxide mils W perbontte and 36 kg. of a masked magnesium oxide molecule of fatty alcohol.
• the coated magnesium oxide Powder comprising 55% of magngsjum oxide d 45% W suitably P 9 y i l magnesium cetyl alcohol: This masked magnesium oxide powder d P with 1110K"! coating submu- Hi- W a9 is obtained by stirring magnesium oxide powder into 1001101.
• silicates such as water and blcarbmmm any
• p y s' c e.g. 2 .to 1% other alkali metal salts, such as Sodium q a n d blending the pp with p sulfate (e.g. s to 20%)
• a perborate e.g. s to 20% or hom a m y bwarbona-te- T other bleaching agents
• stabihzers forthe pcrborate e.g. Optical bughknfi mmfiomd m the p bclfw 1!
• Example 4 Pence Sodium dodecylbenzenesulfonste g Nonylphenol polyglycol ether (20130) Sodium u'ipolyph'osphote 30 Sodium bicarbonate 25 Sodium carboxymethylcelluloae 1 Sodium silicate (water glass) 4 Sodium perbcnte 12 Masked magnesium oxide (50% MgO, 50$
• cetyl alcohol 3 Sodium sulfate 2.5
• Optical brightener 0.06 Water Remainder When dissolved in water of room temperature and up to 60' C., this composition gives a pH of about 9.0. After half an hour of boiling of the solution, its pH increases to 10.0.
• Example 5 Percent Stcaryl alcohol polyglycol ether (30Et0) 15 Sodium tripolyphosphate 35 Sodium bicarbonate 25 Magnesium oxide 2 Sodium earboxymethylcellulose 1 Sodium silicate (water glass) 6 Sodium pe'rborate 8 Sodium sulfate 5 Optical brightener 0.05 Water Remainder This composition, when dissolved in water of 25' C. has a pH of 9.3. After heating to 100' C. the pH increases to 10.3.
• a detergent composition comprising to 50% d at least one alkali metal phosphate selected from fin group consistingof sodium and potassium salts of orthophosphoric acid, metaphosphoric acid, polypbospboric acid and pyropbosphorie acid, 1 to 10% of magnesium oxide, and 15 to 50% of a detergent selected from the group consisting of a nonionic non'soap synthetic org'am'c detergent and an anionic non-soap synthetic organic dctergent, said compodtion having a pH within the range of 7.5 to 9.5 when admixed with water at a temperature below approximately 60' C, said magnesium oxide being Water glass 5 Sodium carboxymethylcellulose 0.5 Sodium perborate 14 Sulfuric acid 4 Sodium sulfate 12 Optical brigbtener 0.06 Water Remainder When dissolved in water of 25' C., this composition had pH 8.5, after heating to 100' C. pH 10.0.
• said organ'iocoating substance melting at a temperature of to C. to provide for dissolving c! said magnesium oxide in water at a temperature above approximately 60 C., said organic coating substance being present on the particles of magnesium oxide in an amount between 25 and by weight of the coated magnesium oxide.
• a detergent composition as in claim 1 which also comprises an alkali metal bicarbonate.

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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)
• Detergent Compositions (AREA)

Applications Claiming Priority (1)

Publications (1)

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Family Applications (1)

Country Status (7)

Cited By (10)

Families Citing this family (3)

Citations (15)

Family Cites Families (1)

• 0
  • NL NL211065D patent/NL211065A/xx unknown
  • NL NL95695D patent/NL95695C/xx active
  • BE BE551479D patent/BE551479A/xx unknown
• 1956
  • 1956-09-28 DE DEA25762A patent/DE1033356B/de active Pending
  • 1956-09-28 FR FR1158070D patent/FR1158070A/fr not_active Expired
  • 1956-10-01 US US612976A patent/US2992186A/en not_active Expired - Lifetime
  • 1956-10-02 GB GB30064/56A patent/GB810151A/en not_active Expired
  • 1956-10-03 CH CH350750D patent/CH350750A/de unknown

Patent Citations (15)

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