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
  • C11D3/40—Dyes ; Pigments
  • C11D3/42—Brightening agents ; Blueing agents

Definitions

• the present invention relates to the use of a highly hydrophilic stilbene-type brightener for increasing the white degree of finished detergent products in the form of pastes or of slurry intermediates. More in particular, the scope of the added brightener is to brighten up the white color of the detergent pastes as to cover the unaesthetic brownish, greyish or yellowish color given by the natural coloration of the raw materials.
• optical brighteners in detergents is well known in the art. But their use is mainly linked to the effect which the optical brighteners have on the surfaces washed with the detergent. In fact, during the washing action, the optical brightener tends to be adsorbed on the surface and to coat it more or less completely. Through the brightener absorbing action of the UV fraction of sun-light and of the subsequent emission in the visible spectrum (a well-known mechanism, see for example Kirk-Othmer Encyclopedia of Chemical Technology - Vol. 4 page 222) an evident increase of whiteness degree of the substrate is obtained.
• optical brightener however does not carries on its action only when it is adsorbed on a solid, but also when it is in an aqueous solution. For this reason a secondary effect of its use relates to the possibility of whitening the detergent itself. In other words, the optical brightener is also useful as white coloring for the detergent. Said established use in the market has simply aesthetic reasons bound to the fact that consumers associate the candour of the detergent to a high washing capability. This necessity promoted the use of optical brighteners in enhancing the fluorescence of the detergent itself.
• a classic example are brighteners, such as biphenyl-4,4'-bis(styryl-2-sulfonic) acid sodium salts, which is used in small amounts but is very expensive.
• optical stilbene-type brighteners which are highly hydrosoluble in order to bleach detergent powders or pastes or intermediate slurries.
• a method for whitening namely for increasing the degree of whiteness, of abrasive creams, detergent pastes, powdery detergents and soaps, said method comprising the addition of from 0.0001% to 1% by weight, calculated on the detergent composition, of one or more compounds of formula (I) wherein R and R 1 , which can be the same or different from each other, are -H, -CH 3 , -CH 2 CH 3 , -CH 2 -CH 2 OH and X is a sodium, potassium or ammonium cation, an amine or an alkanolamine group.
• Detergent compositions having an improved degree of white, containing one or more compounds of formula (I), are a further object of the present invention.
• the salts of said substances are very soluble in water and in water-glycols mixtures and tend to remain easily in solution during washing operations. Accordingly, they do not compete with other kinds of optical brighteners in the adsorbption on any type of surface. They do not disturb the practically experienced systems of optical brightener for textile detergency, nor tend to deposit on hard surfaces nor on the skin.
• the optical brighteners of formula (I) are added during the formulation process of the detergent product, preferably at the end of the formulation.
• the process according to the present invention also applies to a formulated detergent well-known in the market, thus improving its white degree.
• compositions according to the present invention containing one or more compounds of formula (I) are for example abrasive creams, detergent pastes, powder detergents (comprising those obtained by atomization) and soaps.
• compositions are prepared with conventional ingredients and techniques well known to the ordinary person skilled in the art.
• a liquid detergent composition according to the present invention comprises:
• optical brightener In the case of laundry detergent, said optical brightener can be efficaciously combined with more hydrophobic optical brighteners of the same family which vice versa show more markedly the brightener action on the fibre.
• optical brighteners of the same chemical stilbene-triazine family allows a reduction of the number and the type of impurities present in the final product.
• the brightener action of the powder is devoted to a specific optical brightener which does not interact with the other, a reduction of the total amount of optical brightener present in the formulation is achieved.
• the use of an optical brightener allows the effective whitening of the formulation, said whitening being obtainable with difficulty by means of a selection of the abrasive powder.
• An abrasive cream was prepared with the following composition: Non-ionic surfactant (alkyl-ethoxylated alcohol C14 E07) 2% anionic surfactant (sodium lauryl-sulfate) 1% Suspending agent (acryl-vinyl copolymer Polygel W30 (R) by 3V SIGMA) 0.5% Abrasive powder (calcium carbonate) 40% Water up to 100 pH 9-10
• the formulation was prepared by firstly dissolving the surfactants in water, then the polymer. After neutralization with soda and adjusting pH to the defined value, the abrasive powder was added slowly. A cream with a viscosity comprised between 2000 and 5000 cps was obtained.
• a detergent paste was prepared having the following composition: Anionic surfactant (alkyl-ethoxysulfate C14 E02 S04, 28% solution) 40% Anionic surfactant (sodium lauryl-sulfate) 10% Chelating agent (sodium tripolyphosphate) 25% Water up to 100 pH 9-10
• the solution of the surfactants was made under slight heating of the paste.
• a detergent paste identical to the one of Example 5 was prepared.
• a detergent paste identical to the one of Example 5 was prepared.
• Example 8 Bleaching of slurry for powder detergents.
• a slurry for detergent was prepared having the following composition: Anionic surfactant (alkyl-ethoxysulfate C14 E02 S04, 28% solution) 31% Anionic surfactant (sodium lauryl-sulfate) 7.7% Chelating agent (sodium tripolyphosphate) 19% Sodium perborate 12% Tetracetylethylenediamine 4% Zeolites 8% Water up to 100 pH 9-10
• a soap was prepared having the following composition: Fatty acids of natural origin (animal fat, of coconut and palm oil) 70% Glycerin 10% Stearic acid 3,0% Sodium chloride 2,0% EDTA 0.2% BHT 0.01% Water up to 100 pH 8
• Sample B unchanged soap
• Sample R soap added with 0.5% of Titanium oxide as reference brightener agent
• Sample O soap added with 0.06% of hexasodium salt of 2,2'-[1,2-ethenediyl-bis[(3-sulfo-4,1-phenylene)imino-[6-[bis(2-hydroxyethyl)amino-1,3,5-triazin-4,2-diyl]imino]]bis 1,4-benzene disulfonic acid (in particular a 0.5% of an aqueous solution with extinction coefficient of 75 was used).
• optical brightener favours the whitening of the paste much more than a conventional agent such as titanium oxide.

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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)
• Detergent Compositions (AREA)
• Cleaning Or Drying Semiconductors (AREA)
• Crystals, And After-Treatments Of Crystals (AREA)
• Manufacture And Refinement Of Metals (AREA)

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Citations (5)

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• 1996
  • 1996-05-21 IT IT96MI001019A patent/IT1283044B1/it active IP Right Grant
• 1997
  • 1997-05-16 EP EP97107976A patent/EP0808893A3/fr not_active Withdrawn
  • 1997-05-21 JP JP9131162A patent/JPH10183182A/ja active Pending
  • 1997-05-21 BR BR9703300-6A patent/BR9703300A/pt not_active Application Discontinuation

Patent Citations (5)

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