EP0376704A1 - Bleaching composition - Google Patents
Bleaching composition Download PDFInfo
- Publication number
- EP0376704A1 EP0376704A1 EP19890313623 EP89313623A EP0376704A1 EP 0376704 A1 EP0376704 A1 EP 0376704A1 EP 19890313623 EP19890313623 EP 19890313623 EP 89313623 A EP89313623 A EP 89313623A EP 0376704 A1 EP0376704 A1 EP 0376704A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- surfactant
- composition according
- composition
- range
- hydrogen peroxide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
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
- C11D3/39—Organic or inorganic per-compounds
- C11D3/3902—Organic or inorganic per-compounds combined with specific additives
- C11D3/3937—Stabilising agents
- C11D3/394—Organic compounds
-
- 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
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/02—Anionic compounds
- C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
- C11D1/29—Sulfates of polyoxyalkylene ethers
-
- 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
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/66—Non-ionic compounds
- C11D1/83—Mixtures of non-ionic with anionic compounds
-
- 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
- C11D3/3947—Liquid 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
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/02—Anionic compounds
- C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
- C11D1/14—Sulfonic acids or sulfuric acid esters; Salts thereof derived from aliphatic hydrocarbons or mono-alcohols
- C11D1/143—Sulfonic acid esters
-
- 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
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/02—Anionic compounds
- C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
- C11D1/14—Sulfonic acids or sulfuric acid esters; Salts thereof derived from aliphatic hydrocarbons or mono-alcohols
- C11D1/146—Sulfuric acid esters
-
- 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
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/66—Non-ionic compounds
- C11D1/75—Amino oxides
Definitions
- This invention relates to thickened liquid bleach compositions which may be suitable for sale and use as a domestic bleach.
- Pourable domestic bleach is frequently thickened by including one or more surfactants which, in the presence of electrolyte, act to thicken the solution rendering it more viscous than water. Thickening of a pourable domestic bleach helps the user to control dispensing of the composition and retards drainage from surfaces to which it is applied.
- This invention relates to such compositions which include surfactant and electrolyte to increase the viscosity.
- the compositions of the invention may be pourable or may be even more viscous so as not to be poured easily.
- a domestic bleach needs to be adequately stable so that a substantial proportion of the bleaching agent survives during storage between manufacture and use.
- Prior to this invention commercial liquid bleach products have frequently utilised hypochlorite as bleaching agent.
- any attempt to make a surfactant-thickened, alkaline domestic liquid bleach product using hydrogen peroxide as the bleaching agent would encounter the potential problem that the thickening of the solution would require the presence of some electrolyte but that this electrolyte would serve to accelerate decomposition of the peroxide.
- a liquid bleaching composition comprising an aqueous alkaline solution containing hydrogen peroxide, a stabiliser therefor, electrolyte other than surfactant, and surfactant selected from:
- a surfactant as specified above is advantageous in achieving thickening with a fairly low electrolyte concentration. This may make it possible for the electrolyte to be provided by ions which are in the composition for other reasons, without deliberate addition of salt for the sole purpose of enhancing ionic strength. Apart from considerations of peroxide stability, a benefit of a low electrolyte concentration is a reduced tendency for the product to leave streaks on a surface which is cleaned with it.
- the nonionic/amphoteric surfactant is an amine oxide surfactant, preferably a trialkyl amine oxide with one long chain alkyl of 8 to 20 carbon atoms and two alkyl groups of 1 to 4 carbon atoms.
- the weight ratio of amine oxide:alcohol sulphate is preferably in the range from 82:18 to 65:35; better 80:20 to 65:35, even better 80:20 to 70:30.
- Alkane sulphonate is preferred over alcohol sulphate because the viscosity is less sensitive to changes in the composition, so making it easier to produce an end product with repeatable viscosity.
- the weight ratio of amine oxide to alkane sulphonate (when this is used) is preferably in the range from 80:20 to 50:50 or better 65:35, and preferably in the narrower range from 70:30 to 65:35.
- the total concentration of surfactant may lie in a range from 0.75 to 6% by weight based on the whole composition and may lie in the narrower range from 0.75 to 3%, especially if the composition is pourable. Concentrations above 6% by weight might be used but are less preferred.
- the electrolyte concentration in a composition of this invention may be such that the total amount of salts other than surfactant is not more than 7% by weight, better not more than 5% or 3%.
- the electrolyte level may be such as to give a concentration of electrolyte in the range 0.05 to 0.30 molar, preferably 0.1 to 0.2 molar. Once again higher concentrations may be used but are less preferred.
- a sequestering agent may be used in an amount from 0.01 to 1% by weight. This is approximately 1.5 x 10 ⁇ 4 to 2 x 10 ⁇ 2 molar.
- a separate stabilising agent to counteract manganese may be a phosphate salt used in an amount from 0.5% up to 4% by weight, preferably 1 to 3% (reckoned as anhydrous salt). Tetrasodium pyrophosphate may be used as such a salt.
- colloidal hydrous stannic oxide Another possible stabilising agent which we have found to be effective in alkaline solution against decomposition caused by transition metals including both iron and manganese, is colloidal hydrous stannic oxide.
- This stabilising agent is preferably formed in-situ in the solution as the product of hydrolysis of a soluble tin compound.
- Various tin compounds can be added to the solution to undergo hydrolysis to form the stannic oxide, including tin sulphate, sodium stannate, tin dichloride and tin tetrachloride.
- Suitable concentrations of tin compound in the composition may lie in the range from 10 ⁇ 4 molar to 10 ⁇ 2 molar, preferably 3 x 10 ⁇ 3 to 6 x 10 ⁇ 3 molar.
- the quantity of tin compound should not be substantially greater than necessary, since excess of it can itself cause peroxide decomposition.
- An optimum concentration of the tin compound (or any stabiliser) can be determined by making test solutions with various concentrations of the stabiliser and analytically determining the amount of hydrogen peroxide remaining after a period of storage.
- An appropriate viscosity for a pourable composition having the appearance of a thick liquid is a dynamic viscosity in the range from 40 to 250 centipoise (0.05 to 0.25 Pa.sec), preferably about 100 centipoise (0.1 Pa.sec). More viscous liquids for example with viscosity in the range from 250 to 1000 centipoise or more are also within the scope of the invention.
- compositions of this invention are generally aqueous, they will usually have specific gravity close to unity. Consequently values of kinematic viscosities (in stokes) will be numerically approximately the same as values of dynamic viscosity (in poise). Dynamic viscosities expressed in Pascal.sec will be approximately 1000 times kinetic viscosities expressed in m2.sec ⁇ 1.
- the pH of the solution is preferably in the range from 8.0 to 10.5, better 8.5 to 9.8 or 10.0.
- a phosphonate stabiliser it is further preferred that the pH is in the narrower range from 9.2 to 9.8, while with colloidal stannic oxide as stabiliser it is preferable to use a slightly lower pH in the range from 8.7 to 9.3.
- a buffer may be included to maintain pH at the desired value, but this may not be necessary.
- a phosphate, if present, will give a buffering action.
- Another compound which may be used for this purpose is borax.
- the concentration of hydrogen peroxide in compositions of this invention desirably lies in the range from 1 to 15% by weight preferably 2 to 10% by weight.
- Formulations were prepared containing the constituents set out in Table 1 below. The compositions were stored in plastic bottles at 37°C. At intervals aliquots were removed and titrated with potassium permanganate to determine the level of hydrogen peroxide remaining. Results are included in Table 1.
- Example 1 The procedure of Example 1 was repeated, using formulations with the same amounts of hydrogen peroxide, surfactant, perfume and dye.
- Various tin compounds were used at a concentration of 6 x 10 ⁇ 3 molar, both with and without 3.0% borax decahydrate. Glass bottles were used, which are somewhat detrimental to stability. In every case pH was 9.6 initially. Proportions of hydrogen peroxide remaining after 28 days were:- SnCl2 with borax 68% Na2SnO3 with borax 47% SnSO4 with borax 45% Na2SnO3 without borax 96% SnCl4 without borax 68%
- the thickening systems used various constituents and varied both in the properties and total amounts of materials employed.
- the thickening systems contained tallow dimethylamine oxide (AO) together with sodium lauryl sulphate (SLS), or sodium alkane sulphonate (SAS), which was a secondary alkane sulphonate derived from an n-alkane mixture which is principally C13 to C18.
- AO tallow dimethylamine oxide
- SLS sodium lauryl sulphate
- SAS sodium alkane sulphonate
- Viscosities of the formulations were measured using a Ubbelohde capillary viscometer. The results obtained are shown in the accompanying Figures.
- a number of formulations were prepared using as surfactant a linear alkyl ether sulphate of general formula: R(OC2H4) n OSO3 Na where the alkyl group R was C12 and C13 linear alkyl groups, and n had an average value of 3.
- Some of these formulations included a phosphonate stabiliser according to EP 9838.
- Others used stannous chloride which hydrolysed in - situ to colloidal hydrous stannic oxide.
- Peroxide stability was monitored, as in Example 1. Viscosities were determined using a Haake RV2 roto-viscometer at a shear rate of 21sec ⁇ 1 which is appropriate for determining viscosities of pourable domestic bleach products.
- the formulations were as follows:
- alkyl ether sulphate and sodium chloride are set out in the following Table.
- Sodium chloride 4.5% 7% 6.5% 6.5%
- Phosphonate stabiliser according to EP 9839 0.15% 0.15% 0.15% - Stannous chloride dihydrate - - - - 0.14% H2O2 remaining after 5 weeks at 37°C 75% 72% 71% 79% 80% Viscosity (cP) 15 200 600 100 100 100
- Alkaline solutions of hydrogen peroxide were prepared containing surfactant, sodium chloride and stannic chloride which hydrolysed to colloidal hydrous stannic oxide.
- surfactant combinations Two surfactant combinations were used.
- the quantities of surfactant and sodium chloride were such as to give viscosities well in excess of that preferred for a pourable "thick liquid” type of bleach product. Smaller quantities could be used to give a "thick liquid” type of bleach product.
- Stannic chloride was used at a concentration of 2.3 x 10 ⁇ 3 molar.
- One surfactant system consisted of 4.5% by weight of C12-C14 alkyl dimethyl amine oxide and 4.5% by weight sodium lauryl sulphate. This was used with a sodium chloride concentration of 9% by weight.
- the second surfactant system consisted of 5% by weight of C11-C15 secondary alcohol ethoxylated with average 3 ethylene oxide residues, and 5% by weight of sodium lauryl sulphate. This combination was used with 3.37% by weight sodium chloride.
Abstract
R(OC₂H₄)nOSO₃M
or a combination of amine oxide R(CH₃)₂NO with alkane sulphonate RSO₃M or alcohol sulphate ROSO₃M where any R is C₈ to C₂₀ alkyl and any M is a solubilising cation and n is 0.5 to 5. Stabiliser is present and may be colloidal hydrous stannic oxide or may be a phosphonate as specified in EP-B-9839.
Description
- This invention relates to thickened liquid bleach compositions which may be suitable for sale and use as a domestic bleach. Pourable domestic bleach is frequently thickened by including one or more surfactants which, in the presence of electrolyte, act to thicken the solution rendering it more viscous than water. Thickening of a pourable domestic bleach helps the user to control dispensing of the composition and retards drainage from surfaces to which it is applied. This invention relates to such compositions which include surfactant and electrolyte to increase the viscosity. The compositions of the invention may be pourable or may be even more viscous so as not to be poured easily.
- A domestic bleach needs to be adequately stable so that a substantial proportion of the bleaching agent survives during storage between manufacture and use. Prior to this invention commercial liquid bleach products have frequently utilised hypochlorite as bleaching agent.
- It is well known that hydrogen peroxide is unstable unless stabilising agents are present. These counteract decomposition catalysed by transition metal ions. Hydrogen peroxide gives better bleaching action if used under alkaline conditions. However, stabilisation of hydrogen peroxide under alkaline conditions is difficult and in consequence commercial solutions of hydrogen peroxide have generally been acidic for the sake of stability. Certain phosphonates able to stabilise hydrogen peroxide in alkaline solution are disclosed in EP-B-9839 (Unilever).
- The presence of electrolyte tends to cause decomposition of alkaline hydrogen peroxide solution. For instance, we have found that a 4% by weight solution of hydrogen peroxide, made alkaline to
pH 10 and containing 0.25% of ethylene diamine tetramethylene phosphonic acid as stabiliser (which is not as effective as the phosphonates in accordance with EP-B-9839) was found to retain 95% of its hydrogen peroxide after two weeks storage at 37°C. By contrast, 85% or less of the hydrogen peroxide was retained if the solution also contained 1% by weight of sodium chloride, while only about 50% of the hydrogen peroxide was retained if the solution contained 10% by weight of sodium chloride. Similar results were observed using sodium tripolyphosphate rather than sodium chloride as the added electrolyte. Doubling the quantity of the phosphonate stabiliser had little effect on the rate of decomposition. - Thus, any attempt to make a surfactant-thickened, alkaline domestic liquid bleach product using hydrogen peroxide as the bleaching agent would encounter the potential problem that the thickening of the solution would require the presence of some electrolyte but that this electrolyte would serve to accelerate decomposition of the peroxide.
- We have now found, however, that it is possible to formulate an aqueous alkaline solution of hydrogen peroxide which is thickened with surfactant and electrolyte yet does have sufficient stability to be useful as a commercial product.
- According to the present invention there is provided a liquid bleaching composition comprising an aqueous alkaline solution containing hydrogen peroxide, a stabiliser therefor, electrolyte other than surfactant, and surfactant selected from:
- a) an alkyl ether sulphate of the formula:
R(OC₂H₄)n-OSO₃M
where R is an alkyl group containing 8 to 20 carbon atoms, n has an average value in the range 0.5 to 12, preferably 1 to 6, and M is a solubilising cation. - b) a combination of a nonionic or amphoteric surfactant and an anionic surfactant which is either a C₈ to C₂₀ alkane sulphonate or a C₈ to C₂₀ alcohol sulphate.
- We have found that use of a surfactant as specified above is advantageous in achieving thickening with a fairly low electrolyte concentration. This may make it possible for the electrolyte to be provided by ions which are in the composition for other reasons, without deliberate addition of salt for the sole purpose of enhancing ionic strength. Apart from considerations of peroxide stability, a benefit of a low electrolyte concentration is a reduced tendency for the product to leave streaks on a surface which is cleaned with it.
- When the surfactant is a combination, in accordance with the alternative (b) above, a preferred possibility for the nonionic/amphoteric surfactant is an amine oxide surfactant, preferably a trialkyl amine oxide with one long chain alkyl of 8 to 20 carbon atoms and two alkyl groups of 1 to 4 carbon atoms. Then, if primary alcohol sulphate is the anionic surfactant the weight ratio of amine oxide:alcohol sulphate is preferably in the range from 82:18 to 65:35; better 80:20 to 65:35, even better 80:20 to 70:30.
- Alkane sulphonate is preferred over alcohol sulphate because the viscosity is less sensitive to changes in the composition, so making it easier to produce an end product with repeatable viscosity. The weight ratio of amine oxide to alkane sulphonate (when this is used) is preferably in the range from 80:20 to 50:50 or better 65:35, and preferably in the narrower range from 70:30 to 65:35.
- One or more further surfactants may also be included, within the scope of this invention. The total concentration of surfactant may lie in a range from 0.75 to 6% by weight based on the whole composition and may lie in the narrower range from 0.75 to 3%, especially if the composition is pourable. Concentrations above 6% by weight might be used but are less preferred.
- The electrolyte concentration in a composition of this invention may be such that the total amount of salts other than surfactant is not more than 7% by weight, better not more than 5% or 3%. The electrolyte level may be such as to give a concentration of electrolyte in the range 0.05 to 0.30 molar, preferably 0.1 to 0.2 molar. Once again higher concentrations may be used but are less preferred.
- Stabiliser for the hydrogen peroxide may be a phosphonate sequestrant in accordance with EP-B-9839, which defines the phosphonate compounds as of the general formula:
- These compounds are effective to counter decomposition catalysed by iron but are less effective against manganese. We have found that it may be possible to prevent contamination by traces of manganese (e.g. by use of sufficiently pure raw materials) so that a separate stabiliser against manganese may not be required. However, if required a separate stabilising agent to counteract manganese may be a phosphate salt used in an amount from 0.5% up to 4% by weight, preferably 1 to 3% (reckoned as anhydrous salt). Tetrasodium pyrophosphate may be used as such a salt.
- Another possible stabilising agent which we have found to be effective in alkaline solution against decomposition caused by transition metals including both iron and manganese, is colloidal hydrous stannic oxide.
- This stabilising agent is preferably formed in-situ in the solution as the product of hydrolysis of a soluble tin compound. Various tin compounds can be added to the solution to undergo hydrolysis to form the stannic oxide, including tin sulphate, sodium stannate, tin dichloride and tin tetrachloride.
- Suitable concentrations of tin compound in the composition may lie in the range from 10⁻⁴ molar to 10⁻² molar, preferably 3 x 10⁻³ to 6 x 10⁻³ molar. The quantity of tin compound should not be substantially greater than necessary, since excess of it can itself cause peroxide decomposition. An optimum concentration of the tin compound (or any stabiliser) can be determined by making test solutions with various concentrations of the stabiliser and analytically determining the amount of hydrogen peroxide remaining after a period of storage.
- An appropriate viscosity for a pourable composition having the appearance of a thick liquid is a dynamic viscosity in the range from 40 to 250 centipoise (0.05 to 0.25 Pa.sec), preferably about 100 centipoise (0.1 Pa.sec). More viscous liquids for example with viscosity in the range from 250 to 1000 centipoise or more are also within the scope of the invention.
- Since the compositions of this invention are generally aqueous, they will usually have specific gravity close to unity. Consequently values of kinematic viscosities (in stokes) will be numerically approximately the same as values of dynamic viscosity (in poise). Dynamic viscosities expressed in Pascal.sec will be approximately 1000 times kinetic viscosities expressed in m².sec⁻¹.
- The pH of the solution is preferably in the range from 8.0 to 10.5, better 8.5 to 9.8 or 10.0. With a phosphonate stabiliser it is further preferred that the pH is in the narrower range from 9.2 to 9.8, while with colloidal stannic oxide as stabiliser it is preferable to use a slightly lower pH in the range from 8.7 to 9.3. A buffer may be included to maintain pH at the desired value, but this may not be necessary. A phosphate, if present, will give a buffering action. Another compound which may be used for this purpose is borax.
- The concentration of hydrogen peroxide in compositions of this invention, reckoned as pure H₂O₂, desirably lies in the range from 1 to 15% by weight preferably 2 to 10% by weight.
- Formulations were prepared containing the constituents set out in Table 1 below. The compositions were stored in plastic bottles at 37°C. At intervals aliquots were removed and titrated with potassium permanganate to determine the level of hydrogen peroxide remaining. Results are included in Table 1.
- The viscosity of these formulations was measured using a Ubbelohde capillary viscometer and found to be approximately 100cS.
Table 1 Constituent % by weight A B C Hydrogen peroxide (reckoned as anhydrous) 5 5 5 Tallow dimethylamine oxide 1.0 1.0 1.0 Sodium alkane sulphonate 0.5 0.5 0.5 Perfume 1.0 1.0 1.0 Tetrasodium pyrophosphate (reckoned as anhydrous) 1.8 - - Phosphonate stabiliser according to EP 9839 0.15 - - Borax (reckoned as anhydrous) - 1.6 1.6 Sodium stannate trihydrate - 0.5 0.1 Sodium hydroxide to give: pH 9.6 pH 9.6 pH 9.0 Water ----- balance to 100% ----- H₂O₂ remaining after 50 days: 85% 79% H₂O₂ remaining after 100 days: 96% - The procedure of Example 1 was repeated, using formulations with the same amounts of hydrogen peroxide, surfactant, perfume and dye. Various tin compounds were used at a concentration of 6 x 10⁻³ molar, both with and without 3.0% borax decahydrate. Glass bottles were used, which are somewhat detrimental to stability. In every case pH was 9.6 initially. Proportions of hydrogen peroxide remaining after 28 days were:-
SnCl₂ with borax 68% Na₂SnO₃ with borax 47% SnSO₄ with borax 45% Na₂SnO₃ without borax 96% SnCl₄ without borax 68% - A range of formulations were prepared, all containing:
Hydrogen peroxide 5.0% reckoned as anhydrous Tetrasodium pyrophosphate decahydrate 3.0% (approx 1.8% reckoned as anhydrous) Phosphonate stabiliser according to EP 9839 0.3% Perfume 0.1% Sodium hydroxide to pH 9.6 Thickening system variable Water --- balance to 100% --- - The thickening systems used various constituents and varied both in the properties and total amounts of materials employed.
- The thickening systems contained tallow dimethylamine oxide (AO) together with sodium lauryl sulphate (SLS), or sodium alkane sulphonate (SAS), which was a secondary alkane sulphonate derived from an n-alkane mixture which is principally C₁₃ to C₁₈.
- Viscosities of the formulations were measured using a Ubbelohde capillary viscometer. The results obtained are shown in the accompanying Figures.
- Figure 1 shows variation in viscosity with the proportion of SLS in an AO/SLS mixture, while the total amount of AO plus SLS is varied from 1.1% to 1.9% by weight of the composition.
- Figure 2 shows variation in viscosity for AO/SAS mixtures while the total of AO plus SAS is varied from 1.2% to 2.6% of the composition. It can be seen that the viscosity maxima are broader peaks, while the maximum viscosity is less sensitive to variation in the total amount of AO plus SAS. For instance in Figure 1 the concentration of surfactant to give a viscosity of 100cS is 1.2%, and an increase from this of 0.2%, up to 1.4%, would double the viscosity to 200cS. In Figure 2 1.4% total surfactant gives a viscosity of 100cS. Increasing by 0.2% increases the viscosity to 150cS and a larger increase, to 1.8%, is required to achieve 200cS.
- A number of formulations were prepared using as surfactant a linear alkyl ether sulphate of general formula:
R(OC₂H₄)nOSO₃ Na
where the alkyl group R was C₁₂ and C₁₃ linear alkyl groups, and n had an average value of 3. Some of these formulations included a phosphonate stabiliser according to EP 9838. Others used stannous chloride which hydrolysed in-situ to colloidal hydrous stannic oxide. Peroxide stability was monitored, as in Example 1. Viscosities were determined using a Haake RV2 roto-viscometer at a shear rate of 21sec⁻¹ which is appropriate for determining viscosities of pourable domestic bleach products. The formulations were as follows: - The amounts of alkyl ether sulphate and sodium chloride in various formulation, together with the results observed, are set out in the following Table.
Alkyl ether sulphate 3% 3% 3% 1.25% 1.25% Sodium chloride 4% 5.5% 7% 6.5% 6.5% Phosphonate stabiliser according to EP 9839 0.15% 0.15% 0.15% 0.15% - Stannous chloride dihydrate - - - - 0.14% H₂O₂ remaining after 5 weeks at 37°C 75% 72% 71% 79% 80% Viscosity (cP) 15 200 600 100 100 - Alkaline solutions of hydrogen peroxide were prepared containing surfactant, sodium chloride and stannic chloride which hydrolysed to colloidal hydrous stannic oxide.
- Two surfactant combinations were used. The quantities of surfactant and sodium chloride were such as to give viscosities well in excess of that preferred for a pourable "thick liquid" type of bleach product. Smaller quantities could be used to give a "thick liquid" type of bleach product.
- In each case the initial concentration of hydrogen peroxide, reckoned as anhydrous, was 4% by weight. The solutions were made alkaline to
pH 10 with sodium hydroxide. - Stannic chloride was used at a concentration of 2.3 x 10⁻³ molar.
- One surfactant system consisted of 4.5% by weight of C₁₂-C₁₄ alkyl dimethyl amine oxide and 4.5% by weight sodium lauryl sulphate. This was used with a sodium chloride concentration of 9% by weight.
- The second surfactant system consisted of 5% by weight of C₁₁-C₁₅ secondary alcohol ethoxylated with average 3 ethylene oxide residues, and 5% by weight of sodium lauryl sulphate. This combination was used with 3.37% by weight sodium chloride.
- The solutions were stored at 40°C and the amount of hydrogen peroxide remaining was determined at intervals. It was found that the amounts of hydrogen peroxide remaining were between 80 and 85% with either of the surfactant combinations.
Claims (9)
R(OC₂H₄)nOSO₃M
where R is an alkyl group containing 8 to 20 carbon atoms, n has an average value in the range from 0.5 to 12 and M is a solubilising cation.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8830296 | 1988-12-28 | ||
GB888830296A GB8830296D0 (en) | 1988-12-28 | 1988-12-28 | Bleaching composition |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0376704A1 true EP0376704A1 (en) | 1990-07-04 |
EP0376704B1 EP0376704B1 (en) | 1995-02-15 |
Family
ID=10649218
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89313625A Expired - Lifetime EP0376706B1 (en) | 1988-12-28 | 1989-12-27 | Bleaching composition |
EP89313623A Expired - Lifetime EP0376704B1 (en) | 1988-12-28 | 1989-12-27 | Bleaching composition |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89313625A Expired - Lifetime EP0376706B1 (en) | 1988-12-28 | 1989-12-27 | Bleaching composition |
Country Status (11)
Country | Link |
---|---|
EP (2) | EP0376706B1 (en) |
JP (2) | JP2562064B2 (en) |
AU (2) | AU624209B2 (en) |
BR (2) | BR8906843A (en) |
CA (2) | CA2006531C (en) |
DE (2) | DE68921182T2 (en) |
ES (2) | ES2067559T3 (en) |
GB (1) | GB8830296D0 (en) |
IN (2) | IN170708B (en) |
NO (2) | NO172354C (en) |
ZA (2) | ZA899842B (en) |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995009226A1 (en) * | 1993-09-28 | 1995-04-06 | Solvay Interox Limited | Thickened compositions |
EP0667392A2 (en) * | 1994-02-14 | 1995-08-16 | JEYES GROUP plc | Bleach compositions |
DE4413433A1 (en) * | 1994-04-18 | 1995-10-19 | Henkel Kgaa | Aqueous bleach |
WO1996001311A1 (en) * | 1994-07-01 | 1996-01-18 | Warwick International Group Limited | Bleaching compositions |
EP0741185A1 (en) * | 1995-05-05 | 1996-11-06 | Degussa Aktiengesellschaft | Phosphorus free stabilized alkaline peroxygen solutions |
EP0770123A1 (en) * | 1994-06-13 | 1997-05-02 | S.C. Johnson & Son, Inc. | Soft surface cleaning composition with hydrogen peroxide |
WO1997047718A2 (en) * | 1996-06-13 | 1997-12-18 | Henkel Kommanditgesellschaft Auf Aktien | Thickening agent for aqueous hydrogen peroxide solutions |
WO1999006505A1 (en) * | 1997-07-31 | 1999-02-11 | Unilever Plc | Detergent composition and dishwashing process |
AU741580C (en) * | 1998-06-23 | 2000-01-10 | Saban Ventures Pty Limited | Improved disinfection |
WO2000023555A1 (en) * | 1998-10-22 | 2000-04-27 | Colgate-Palmolive Company | Thickened liquid hydrogen peroxide bleach compositions |
WO2000070125A1 (en) * | 1999-05-13 | 2000-11-23 | Warwick International Group Limited | Metal cleaning process |
GB2358635A (en) * | 1998-06-10 | 2001-08-01 | Secr Defence | Surface coatings |
WO2004067194A2 (en) * | 2003-01-31 | 2004-08-12 | Reckitt Benckiser N.V. | Aqueous cleaning compositions |
WO2004104147A1 (en) * | 2003-05-22 | 2004-12-02 | Reckitt Benckiser N.V. | Aqueous cleaning compositions |
US7045493B2 (en) | 2004-07-09 | 2006-05-16 | Arkema Inc. | Stabilized thickened hydrogen peroxide containing compositions |
DE102005000955A1 (en) * | 2005-01-07 | 2006-07-20 | Henkel Kgaa | Liquid bleach composition |
US7169237B2 (en) | 2004-04-08 | 2007-01-30 | Arkema Inc. | Stabilization of alkaline hydrogen peroxide |
US7431775B2 (en) | 2004-04-08 | 2008-10-07 | Arkema Inc. | Liquid detergent formulation with hydrogen peroxide |
US8182600B2 (en) * | 2003-07-28 | 2012-05-22 | Industrie De Nora S.P.A. | Electrode for electrochemical processes and method for producing the same |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB8830296D0 (en) * | 1988-12-28 | 1989-02-22 | Unilever Plc | Bleaching composition |
DE4123142A1 (en) * | 1991-07-12 | 1993-01-14 | Henkel Kgaa | FLUESSIGWASCHMITTEL |
US5217710A (en) * | 1992-03-05 | 1993-06-08 | Chesebrough-Pond's Usa Co. | Stabilized peroxide gels containing fluoride |
CN105925398B (en) * | 2016-05-17 | 2018-11-23 | 河南工程学院 | A kind of degerming liquid detergent composition and preparation method thereof |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB855679A (en) * | 1958-07-10 | 1960-12-07 | Unilever Ltd | Improvements in or relating to liquid detergent compositions |
US3388069A (en) * | 1964-01-04 | 1968-06-11 | Henkel & Cie Gmbh | Liquid active oxygen detergent bleaching concentrate |
FR2140822A5 (en) * | 1971-06-09 | 1973-01-19 | Air Liquide | Bleaching liquids - contg hydrogen peroxide or persalts in alkaline medium with stabilisers |
EP0037184A2 (en) * | 1980-04-01 | 1981-10-07 | Interox Chemicals Limited | Liquid detergent compositions, their manufacture and their use in washing processes |
JPS5838800A (en) * | 1981-09-01 | 1983-03-07 | 三菱瓦斯化学株式会社 | Liquid detergent |
EP0087049A1 (en) * | 1982-02-15 | 1983-08-31 | Henkel Kommanditgesellschaft auf Aktien | Concentrate of disinfecting agent |
EP0141759A1 (en) * | 1983-09-20 | 1985-05-15 | Elf Atochem S.A. | Fluid, storage-stable detergent compositions with a bleaching activity for textiles, and process for their preparation |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL222456A (en) * | 1956-11-14 | |||
US3701825A (en) * | 1970-10-23 | 1972-10-31 | Fmc Corp | Stabilization of hydrogen peroxide with ethylenediamine tetra (methylenephosphonic acid) |
US4304762A (en) * | 1978-09-27 | 1981-12-08 | Lever Brothers Company | Stabilization of hydrogen peroxide |
US4299802A (en) * | 1980-03-31 | 1981-11-10 | Union Carbide Corporation | Process for removing carbonyl sulfide from gaseous streams |
JPS56151798A (en) * | 1980-04-01 | 1981-11-24 | Interox Chemicals Ltd | Liquid detergent composition |
CA1205275A (en) * | 1982-06-14 | 1986-06-03 | Kenneth J. Radimer | Stabilization of high purity hydrogen peroxide |
JPS593006A (en) * | 1982-06-14 | 1984-01-09 | エフ・エム・シ−・コ−ポレ−シヨン | Method of stabilizing high-purity hydrogen peroxide |
JP2783999B2 (en) * | 1985-06-12 | 1998-08-06 | 花王株式会社 | Bleach composition |
GB8830296D0 (en) * | 1988-12-28 | 1989-02-22 | Unilever Plc | Bleaching composition |
-
1988
- 1988-12-28 GB GB888830296A patent/GB8830296D0/en active Pending
-
1989
- 1989-12-21 ZA ZA899842A patent/ZA899842B/en unknown
- 1989-12-21 ZA ZA899843A patent/ZA899843B/en unknown
- 1989-12-22 AU AU47272/89A patent/AU624209B2/en not_active Ceased
- 1989-12-22 AU AU47271/89A patent/AU623961B2/en not_active Ceased
- 1989-12-22 CA CA002006531A patent/CA2006531C/en not_active Expired - Fee Related
- 1989-12-22 CA CA002006530A patent/CA2006530C/en not_active Expired - Fee Related
- 1989-12-27 ES ES89313625T patent/ES2067559T3/en not_active Expired - Lifetime
- 1989-12-27 ES ES89313623T patent/ES2067558T3/en not_active Expired - Lifetime
- 1989-12-27 NO NO895261A patent/NO172354C/en not_active IP Right Cessation
- 1989-12-27 DE DE68921182T patent/DE68921182T2/en not_active Expired - Fee Related
- 1989-12-27 IN IN355/BOM/89A patent/IN170708B/en unknown
- 1989-12-27 NO NO895260A patent/NO173885C/en not_active IP Right Cessation
- 1989-12-27 DE DE68921181T patent/DE68921181T2/en not_active Expired - Fee Related
- 1989-12-27 IN IN354/BOM/89A patent/IN171127B/en unknown
- 1989-12-27 EP EP89313625A patent/EP0376706B1/en not_active Expired - Lifetime
- 1989-12-27 EP EP89313623A patent/EP0376704B1/en not_active Expired - Lifetime
- 1989-12-28 JP JP1345128A patent/JP2562064B2/en not_active Expired - Fee Related
- 1989-12-28 JP JP1345129A patent/JPH0735520B2/en not_active Expired - Lifetime
- 1989-12-28 BR BR898906843A patent/BR8906843A/en not_active IP Right Cessation
- 1989-12-28 BR BR898906844A patent/BR8906844A/en not_active IP Right Cessation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB855679A (en) * | 1958-07-10 | 1960-12-07 | Unilever Ltd | Improvements in or relating to liquid detergent compositions |
US3388069A (en) * | 1964-01-04 | 1968-06-11 | Henkel & Cie Gmbh | Liquid active oxygen detergent bleaching concentrate |
FR2140822A5 (en) * | 1971-06-09 | 1973-01-19 | Air Liquide | Bleaching liquids - contg hydrogen peroxide or persalts in alkaline medium with stabilisers |
EP0037184A2 (en) * | 1980-04-01 | 1981-10-07 | Interox Chemicals Limited | Liquid detergent compositions, their manufacture and their use in washing processes |
JPS5838800A (en) * | 1981-09-01 | 1983-03-07 | 三菱瓦斯化学株式会社 | Liquid detergent |
EP0087049A1 (en) * | 1982-02-15 | 1983-08-31 | Henkel Kommanditgesellschaft auf Aktien | Concentrate of disinfecting agent |
EP0141759A1 (en) * | 1983-09-20 | 1985-05-15 | Elf Atochem S.A. | Fluid, storage-stable detergent compositions with a bleaching activity for textiles, and process for their preparation |
Non-Patent Citations (1)
Title |
---|
CHEMICAL ABSTRACTS, vol. 99, no. 22, 28 November 1983, Columbus, Ohio, US; abstract no. 177871E, page 113; column 2; * |
Cited By (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU687877B2 (en) * | 1993-09-28 | 1998-03-05 | Solvay Interox Limited | Thickened compositions |
WO1995009226A1 (en) * | 1993-09-28 | 1995-04-06 | Solvay Interox Limited | Thickened compositions |
US5736498A (en) * | 1993-09-28 | 1998-04-07 | Solvay Interox Limited | Thickened aqueous hydrogen peroxide compositions and methods of making same |
CN1067103C (en) * | 1993-09-28 | 2001-06-13 | 索尔维因特罗斯有限公司 | Thickened compositions |
GB2286603B (en) * | 1994-02-14 | 1998-03-25 | Jeyes Group Plc | Bleach compositions |
EP0667392A3 (en) * | 1994-02-14 | 1995-11-15 | Jeyes Group Plc | Bleach compositions. |
EP0667392A2 (en) * | 1994-02-14 | 1995-08-16 | JEYES GROUP plc | Bleach compositions |
DE4413433A1 (en) * | 1994-04-18 | 1995-10-19 | Henkel Kgaa | Aqueous bleach |
US5716924A (en) * | 1994-04-18 | 1998-02-10 | Henkel Kommanditgesellschaft Auf Aktien | Aqueous bleaching formulations |
WO1995028470A1 (en) * | 1994-04-18 | 1995-10-26 | Henkel Kommanditgesellschaft Auf Aktien | Aqueous bleaching agents |
DE4413433C2 (en) * | 1994-04-18 | 1999-09-16 | Henkel Kgaa | Aqueous bleach |
EP0770123A1 (en) * | 1994-06-13 | 1997-05-02 | S.C. Johnson & Son, Inc. | Soft surface cleaning composition with hydrogen peroxide |
EP0770123A4 (en) * | 1994-06-13 | 1999-06-30 | Johnson & Son Inc S C | Soft surface cleaning composition with hydrogen peroxide |
WO1996001311A1 (en) * | 1994-07-01 | 1996-01-18 | Warwick International Group Limited | Bleaching compositions |
US5801138A (en) * | 1994-07-01 | 1998-09-01 | Warwick International Group Limited | Bleaching compositions |
US5736497A (en) * | 1995-05-05 | 1998-04-07 | Degussa Corporation | Phosphorus free stabilized alkaline peroxygen solutions |
EP0741185A1 (en) * | 1995-05-05 | 1996-11-06 | Degussa Aktiengesellschaft | Phosphorus free stabilized alkaline peroxygen solutions |
WO1997047718A2 (en) * | 1996-06-13 | 1997-12-18 | Henkel Kommanditgesellschaft Auf Aktien | Thickening agent for aqueous hydrogen peroxide solutions |
WO1997047718A3 (en) * | 1996-06-13 | 1998-02-12 | Henkel Kgaa | Thickening agent for aqueous hydrogen peroxide solutions |
WO1999006505A1 (en) * | 1997-07-31 | 1999-02-11 | Unilever Plc | Detergent composition and dishwashing process |
GB2358635A (en) * | 1998-06-10 | 2001-08-01 | Secr Defence | Surface coatings |
AU741580C (en) * | 1998-06-23 | 2000-01-10 | Saban Ventures Pty Limited | Improved disinfection |
AU741580B2 (en) * | 1998-06-23 | 2001-12-06 | Saban Ventures Pty Limited | Improved disinfection |
WO2000023555A1 (en) * | 1998-10-22 | 2000-04-27 | Colgate-Palmolive Company | Thickened liquid hydrogen peroxide bleach compositions |
WO2000070125A1 (en) * | 1999-05-13 | 2000-11-23 | Warwick International Group Limited | Metal cleaning process |
WO2004067194A3 (en) * | 2003-01-31 | 2004-11-18 | Reckitt Benckiser Nv | Aqueous cleaning compositions |
WO2004067194A2 (en) * | 2003-01-31 | 2004-08-12 | Reckitt Benckiser N.V. | Aqueous cleaning compositions |
WO2004104147A1 (en) * | 2003-05-22 | 2004-12-02 | Reckitt Benckiser N.V. | Aqueous cleaning compositions |
US8182600B2 (en) * | 2003-07-28 | 2012-05-22 | Industrie De Nora S.P.A. | Electrode for electrochemical processes and method for producing the same |
US7169237B2 (en) | 2004-04-08 | 2007-01-30 | Arkema Inc. | Stabilization of alkaline hydrogen peroxide |
US7431775B2 (en) | 2004-04-08 | 2008-10-07 | Arkema Inc. | Liquid detergent formulation with hydrogen peroxide |
US7045493B2 (en) | 2004-07-09 | 2006-05-16 | Arkema Inc. | Stabilized thickened hydrogen peroxide containing compositions |
US7169743B2 (en) | 2004-07-09 | 2007-01-30 | Arkema Inc. | Stabilized thickened hydrogen peroxide containing compositions with a mixture of stabilizers |
DE102005000955A1 (en) * | 2005-01-07 | 2006-07-20 | Henkel Kgaa | Liquid bleach composition |
DE102005000955B4 (en) * | 2005-01-07 | 2007-08-30 | Henkel Kgaa | Liquid bleach composition |
Also Published As
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0376704A1 (en) | Bleaching composition | |
FI83430C (en) | Tixotropic liquid detergent composition for automatic dishwashers with improved physical stability | |
US4576728A (en) | Cleaning compositions | |
CA1217004A (en) | Cleaning compositions | |
CA1151808A (en) | Liquid, thickened chlorine bleaching composition | |
US4752409A (en) | Thixotropic clay aqueous suspensions | |
US5185096A (en) | Aqueous liquid automatic dishwashing detergent composition comprising hypochlorite bleach and bleach stabilizer | |
US4801395A (en) | Thixotropic clay aqueous suspensions containing long chain saturated fatty acid stabilizers | |
IE861398L (en) | Cleaning compositions | |
EP0667392A2 (en) | Bleach compositions | |
WO1995018209A1 (en) | Thickened alkaly metal hypochlorite compositions | |
FI91277C (en) | Aqueous thixotropic automatic dishwasher detergent composition, its preparation method and a method for washing dishes | |
EP0144160B1 (en) | Movement sensor | |
US4561994A (en) | Surfactant free stable hypochlorite paste | |
EP0079697B2 (en) | Cleaning compositions | |
EP0147943B1 (en) | Bleaching compositions | |
EP0311175B1 (en) | Sanitizer | |
PT88929B (en) | A process for the preparation of a detergent composition comprising a disintegrating agent and a disintegrating agent for the preparation of a disintegrating agent. | |
JPH04349109A (en) | Alkaline aqueous hydrogen peroxide solution and method for stabilizing same | |
EP0320126A1 (en) | Stability of liquid automatic dish-washing detergents | |
EP0288812B1 (en) | Use of an inhibitor of corrosion on ceramic surfaces | |
GB2245605A (en) | Hydrogen peroxide bleach | |
JP2562064C (en) |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): CH DE ES FR GB IT LI NL SE |
|
17P | Request for examination filed |
Effective date: 19900607 |
|
RAP3 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: UNILEVER N.V. Owner name: UNILEVER PLC |
|
17Q | First examination report despatched |
Effective date: 19930329 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE PATENT HAS BEEN GRANTED |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): CH DE ES FR GB IT LI NL SE |
|
REF | Corresponds to: |
Ref document number: 68921181 Country of ref document: DE Date of ref document: 19950323 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2067558 Country of ref document: ES Kind code of ref document: T3 |
|
ET | Fr: translation filed | ||
ITF | It: translation for a ep patent filed |
Owner name: JACOBACCI & PERANI S.P.A. |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
26N | No opposition filed | ||
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 19961203 Year of fee payment: 8 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19971231 Ref country code: CH Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19971231 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19991118 Year of fee payment: 11 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: NL Payment date: 19991215 Year of fee payment: 11 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20001228 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20010701 |
|
EUG | Se: european patent has lapsed |
Ref document number: 89313623.4 |
|
NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 20010701 |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20051216 Year of fee payment: 17 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20051221 Year of fee payment: 17 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20051226 Year of fee payment: 17 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20060131 Year of fee payment: 17 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20061231 Year of fee payment: 18 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070703 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 20061227 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST Effective date: 20070831 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20061227 |
|
REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20061228 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20061228 Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20070102 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20071227 |