MXPA06001406A

MXPA06001406A - Composition for treating textilescomprising a photo bleaching component and a fluorescent whitening component.

Info

Publication number: MXPA06001406A
Application number: MXPA06001406A
Authority: MX
Inventors: Alan David Willey
Original assignee: Procter & Gamble
Priority date: 2003-08-06
Filing date: 2004-07-30
Publication date: 2006-05-15
Also published as: US20050028294A1; EP1651744A1; JP2007500269A; AR045357A1; WO2005017082A1; CN1833019A

Abstract

The present invention relates to a composition comprising a photo-bleaching component and a fluorescent whitening component having good compatibility. In particular, the present invention relates to a composition suitable for the treatment of textiles, comprising a photo-bleaching component and a fluorescent whitening component, wherein the photo-bleaching component is capable of absorbing light to form an intermediate energetically excited photo-bleaching component, the intermediate energetically excited photo-bleaching component is capable of activating molecular oxygen from its triplet oxygen electronic energy state to its singlet oxygen electronic energy state, characterised in that the intermediate energetically excited photo-bleaching component has a lifetime of greater than 50 microseconds, preferably greater than 100 microseconds, more preferably greater than 200 microseconds, and most preferably greater than 300 microseconds.

Description

COMPOSITION COMPRISING A PHOTOBLANKING COMPONENT AND A FLUORESCENT WHITENING COMPONENT FOR THE TREATMENT OF FABRICS TECHNICAL FIELD The present invention relates to a composition suitable for the treatment of textiles, especially a laundry detergent composition, comprising a compatible photobleaching component and a fluorescent whitening component.

BACKGROUND OF THE INVENTION Consumers, especially those who live in countries that have an abundant supply of sunlight, and also those consumers who live in the United Kingdom, typically dry their freshly washed clothes out in the sunlight. Detergent manufacturers take advantage of this consumer habit to provide benefits to freshly laundered garments by incorporating technologies, such as photo-bleaching agents and fluorescent whitening agents into their laundry detergent products, for example to provide after-wash bleaching benefits and benefits. of bleaching the fabric. Detergent manufacturers have formulated laundry detergents comprising both photobleaching agents and fluorescent whitening agents; for example, U.S. Pat. no. 4,311,605 refers to compositions comprising photobleaching agents and fluorescent whitening agents, which are reported to result in a synergistic bleaching effect. The photobleach is capable of absorbing light at the visible wavelength to form an energy-excited intermediate photobleach, which is capable of activating the molecular oxygen from its electronic energy state of triplet oxygen to its electronic energy state of singlet oxygen. Singlet oxygen is a powerful bleach that is capable of oxidizing a vast array of substrates, including many soiled ones that are typically found and washed in laundry processes. Fluorescent whitening agents are able to absorb light in the ultraviolet wavelength band and re-emit light in the visible wavelength band. Typically, light in the blue region of the visible wavelength band is re-emitted, providing the freshly laundered garments with a bluish shade preferred by consumers. This bluish tone is especially preferred when the washed clothes are white and comprise natural cotton since the bluish shade hides the yellowness of the natural cotton fibers. The inventors have surprisingly identified that there is a problem of incompatibility with photobleaching agents and fluorescent whitening agents when present in the same detergent formulation, and that the combination of these two components in the laundry detergent composition does not always provide as much of a photobleaching benefit. effective as an effective bleaching benefit. Effectively, the inventors have surprisingly discovered that there is a tendency for the fluorescent whitening agent to reduce the operation of the photobleach. Without being limited by theory, the inventors believe that the fluorescent whitening agent competes with molecular oxygen for the energy released by the triplet state of the photobleach (which is the photo-bleaching intermediate component excited energy), thus reducing the formation of a singlet oxygen and its subsequent bleaching effect. This problem of the incompatibility of the photobleaching agent and the fluorescent whitening agent has not been identified in the prior industry. There has been no reason to suspect the existence of a problem of incompatibility between the photobleaching agent and the fluorescent whitening agent since it was believed that the photobleaching mechanism and the fluorescent whitening mechanism were totally independent mechanisms, which absorb light from bands of different wavelengths, and the wavelength of the light reemitted by the fluorescent whitening agent is substantially different from the wavelength of the light absorbed by the photobleach. The inventors have overcome this problem of incompatibility by ensuring thatWhen the photobleaching agent is formulated with a fluorescent whitening agent, the energy-excited photobleaching intermediate component has a long life time. This is achieved by careful selection of the photobleaner and the fluorescent whitening agent to be formulated together in the same laundry detergent composition.

BRIEF DESCRIPTION OF THE INVENTION The present invention provides a composition suitable for the treatment of textiles, comprising a photobleaching component and a fluorescent whitening component, wherein the photobleaching component is capable of absorbing light to form an electrically excited photobleaching intermediate component; the electrically excited photobleaching intermediate component is capable of activating molecular oxygen from its electron energy state of triplet oxygen to its electron energy state of singlet oxygen, characterized in that the energy-excited photobleaching intermediate component has a lifetime of more than 50 microseconds.

DETAILED DESCRIPTION OF THE INVENTION Composition The composition is suitable for the treatment of textiles. Particularly, the composition is a laundry detergent composition. The composition may be in particulate form or in liquid form. Typically, the composition is in particulate form, for example, in the form of an agglomerate, a spray-dried powder, an extruded material, a flake, or any combination thereof. The composition may also be in the form of a tablet or other unit dosage form such as a bag. The composition may be enclosed at least partially, or preferably completely enclosed, by a water soluble film such as a film comprising polyvinyl alcohol. However, typically, the composition is a granular laundry detergent composition. The composition comprises a photobleaching component, which is described in more detail below. The composition also comprises a fluorescent whitening component, which is described in more detail below. The composition may also comprise additional auxiliary components, which are described in more detail below. Preferably, the composition is a laundry detergent composition comprising a photobleaching component, a fluorescent whitening component, a detersive surfactant, a builder, optionally a bleach and optionally other auxiliary detergent components. Photo-bleaching component The photo-bleaching component is capable of absorbing light to form an electrically excited photobleaching intermediate component. The electrically excited photobleaching intermediate component is capable of activating the molecular oxygen from its electron energy state of triplet oxygen to its electronic energy state of singlet oxygen. Molecular oxygen in its electronic energy state of singlet oxygen is capable of oxidizing a vast array of substrates by a variety of mechanisms including ene reactions and cycloaddition reactions. An example of a reaction is presented below: An example of a cycloaddition reaction is presented below: 0 = 0 0-0 or. o ^^ J The process for the generation of molecular oxygen in its electronic energy state of singlet oxygen is presented in more detail below: Light IS C P (S) P (T) Oxygen Oxygen Singlet Molecular The absorption of light by the photobleaching component P leads to the formation of a photobleaching intermediate component P (S) typically in its singlet excited state. Since the oxygen has a triplet fundamental state, the photoblanking intermediate component P (S) must undergo system cross-linking (ISC) to form an electrically excited photoblanking intermediate component P (T), typically in its excited triplet state, in order to interact with the oxygen in its ground state. The crossing between systems usually proceeds with good efficiency. As soon as the electrically excited photoblanking intermediate component P (T) is formed, the collision with molecular oxygen (in its electron energy state of triplet oxygen) can lead to the transfer of energy to molecular oxygen in its electronic energy state of oxygen singlet As soon as it is formed, the molecular oxygen in the electronic energy state of the singlet oxygen is reactive with a range of substrates, as described above in more detail. The electrically excited photobleaching intermediate component has a lifetime greater than 50 microseconds, preferably greater than 100 microseconds, more preferably greater than 200 microseconds, and even more preferably greater than 300 microseconds. The lifetime of the energy-excited photobleaching intermediate component is described in more detail below. The lifetime of the energy-excited photobleaching intermediate component is the lifetime of the aforementioned component when it is in the presence of the fluorescent whitening component. Preferably the photobleaching component is a sulfonated phthalocyanine having an average degree of sulfonation of from more than 3.0 to less than 4.0, preferably from 3.8 to less than 4.0, the sulfonated phthalocyanine is complexed with a metal cation. Typically, the sulfonated phthalocyanine is not substituted with a halide group. Preferably, the photobleaching agent is a sulfonated zinc phthalocyanine having an average degree of sulfonation of more than 3.0 to less than 4.0, preferably 3.8 to less than 4.0. The photobleaching component may be a sulfonated tin phthalocyanine, a sulfonated tin naphthalocyanine or a mixture thereof. The photobleaching component may be a sulfonated zinc naphthalocyanine, a sulfonated aluminum naphthalocyanine, a sulfonated tin naphthalocyanine or any mixture thereof. The photobleaching component may preferably be a mixture of a sulfonated zinc phthalocyanine and a sulfonated aluminum phthalocyanine, wherein the molar ratio of the sulphonated zinc phthalocyanine to the sulfonated aluminum phthalocyanine is less than 3: 1, preferably less than 2: 1. Other photobleaching components that may be suitable for use in the present invention are those described in more detail by A. D. Willey in Powdered Detergents, ed. M. Showell, Surfactant Series Vol 71, Marcel Dekker, New York, 1998, p185-203. Optionally, the photobleaching component can be encapsulated. Suitable encapsulating materials are described in more detail in WO03 / 018738 and WO03 / 18740. A preferred encapsulating material is starch. Fluorescent bleach component Fluorescent whitening components are typically capable of absorbing light in the ultraviolet wavelength band and re-emitting light in the visible band. Typically light in the blue region of the visible wavelength band is re-emitted, providing the freshly treated fabrics with a bluish shade preferred by consumers. Preferably, the fluorescent whitening component is a substituted stilbenesulfonic acid or a salt thereof which is substituted by at least triazol-2-yl portion. Preferably, the fluorescent whitening component is a molecule having the general formula: Preferably, the fluorescent whitening component molecule having the general formula: Another brightener which may be suitable for use in the present invention is sodium dibenzobiphenyldisulfonate. Other preferred fluorescent whitening components that may be suitable for use in the present invention are described in more detail by L. Ho Tan Tai in Formulating Detergents and Personal Care Products: A Complete Guide to Product Development (Formulation of Detergents and Personal Care Products) : a complete guide for the development of products), AOCS Press, Champaign, 2000, p122-37.

Prolonged life time of the energy excited photobleaching intermediate component The inventors have surprisingly discovered that good compatibility between the photobleaching component and the fluorescent whitening component can be achieved by ensuring that the lifetime of the energetically excited photobleaching intermediate component (when in the presence of the bleaching component) fluorescent) is at least 50 microseconds, preferably at least 100 microseconds, more preferably at least 200 microseconds and even more preferably at least 300 microseconds. This can be achieved, for example, by the careful selection of the fluorescent whitening components and the photobleaching components to be used in combination with one another. Typically, the lifetime of the energy-excited photobleaching intermediate component (when in the presence of the fluorescent whitening component) is very short. For example, the lifetime of the electrically excited photobleaching intermediate component of a sulfonated zinc phthalocyanine photobleaching component when used in combination with a fluorescent whitening component of 4,4'-bis- (2-sulphotryl) biphenyl disodium is 3 microseconds The lifetime of the electrically excited photobleaching intermediate component of a sulfonated zinc phthalocyanine photobleaching component when used in combination with a 4,4'-bis [(4-anilino-6-morpholino-s-triazin-2-yl) -amino] -2,2'-stilbene-disulfonate disodium is 4 microseconds. The lifetime of the electrically excited photobleaching intermediate component of a sulfonated zinc phthalocyanine photobleaching component when used in combination with a 4,4'-bis [(4,6-dianilino-s-triazin-2-yl) -am No] -2,2'-stilbene disulfonate disodium is 4 microseconds. All these combinations provide a very poor photo-bleach operation, especially in laundry cleaning applications. These short-lived combinations for the energy-excited photobleaching intermediate component are all outside the scope of the claims and are not in accordance with the present invention. However, the lifetime of an electrically excited photobleaching intermediate component of a sulfonated zinc phthalocyanine having an average degree of sulfonation of more than 3.0 to less than 4.0, and especially of 3.8 to less than 4.0, when used in combination with a fluorescent whitening component is the sodium salt of 4,4'-bis- (4-phenyl-1,2,3-triazol-2-yl) -2,2'-stilbene-d-sulfonic acid is 310 microseconds , and good photobleaching and good bleaching performance is observed. This careful selection of the photobleaching component and the fluorescent whitening component is much greater than the lifetime compared to the combinations described above having lifetimes of only 3, 4 and 8 microseconds, respectively. The lifetime of the energy-excited photobleaching intermediate component is typically determined using flash photolysis, for example by means of the use of an Nd-YAG laser (Lumonics Ltd) as the excitation source, a xenon arc lamp (Applied Photophysics) Ltd) as the analyzer source and a R928 photomultiplier (Hanamatsu Ltd) as the detector. A suitable flash photolysis method that can be used to determine the lifetime of the energy-excited photobleaching intermediate component is described in more detail by C. Willsher, Journal of the Society of Dyers and Colourists, 1988, Vol 104, p472-476. The skilled person, in light of the disclosure of the present invention, can calculate without much difficulty the lifetime of the photo-bleaching intermediate component energized in the presence of a particular fluorescent whitening component, and the experienced person can select combinations of a photobleaching component and a fluorescent whitening component having good bleaching performance and bleaching benefits that are in accordance with the present invention. Auxiliary detergent components The composition may optionally comprise one or more auxiliary detergent components. These auxiliary detergent components are typically selected from the group consisting of detersive surfactants, detergency builders, polymeric builders, bleaches, chelating agents, enzymes, antiredeposition polymers, soil release polymers, polymeric soil dispersing agents and / or soil release agents. dirt suspension, dye transfer inhibitors, fabric integrity agents, foam suppressors, fabric softeners, flocculants, perfumes and combinations thereof. Suitable auxiliary components are described in more detail in W097 / 11151, especially page 15, line 31 to page 27, line 27, and page 28, line 5 to page 56, line 24, and page 48, line 2 to page 50, line 4.

EXAMPLES The following granular laundry detergent compositions A-F having a bulk density of 440 g / L to 580 g / L are prepared according to the present invention.

Ingredient ABCDEF C12-C15 sodium alkylsulfate 0.9 0.6 0.8 0.7 condensed with an average of 3 moles of ethylene oxide Linear alkyl benzene sulfonate 22 16 17 28 19 17 sodium C11-C13 Cationic surfactant having 0.4 0.7 0.5 0.8 0.6 0.5 the general formula: R2. + (CH3) 2 (C2H40H), where R2 = C12-C14 Sodium carbonate 14 16 6 15 8 9 Sodium silicate 5 9 17 6 10 8 Sodium sulfate 5 10 21 14 19 25 Sodium tripolyphosphate 32 26 26 30 28 Zeolite A 30 Acid 0.3 0.4 0.7 0.6 0.4 0.3 Diethylenetriaminepentaacetic acid Magnesium sulfate 1.1 1.6 Perborate whitener of 4 3 sodium of the nominal formula: NaB03.H20 (6-Nonamidocaproil) 1.8 Oxybenzenesulfonate Nonanoyloxybenzenesulfonate 1.5 Ethylenediamine telraacetate 0.55 0.7 Photo-bleach component 0.0018 0.003 0.001 is a sulphonated zinc phthalocyanine, with an average sulfonation degree of 3.95 Photoblanking component 0.0012 0.002 0.004 0.003 which is a sulfonated aluminum phthalocyanine, with an average sulfonation degree of 3.95 A bleaching component 0.1 0.05 0.1 0.15 0.05 fluorescent which is a 4 , 4'-bis- (4-pheny1,2,3-triazoi-2-yl) -2,2'-stilbene-disulfonate disodium, supplied by Bayer under the trademark Blankophor BHC. A fluorescent whitening component 0.05 0.2 0.05 0.05 which is sodium 4- [2H-naphtho [1,2-d] triazol-2-yl] stilbene-2-sulfonate, supplied by Ciba under the trademark Tinopal RBS A bleaching component 0.05 0.1 0.12 fluorescent which is a methylated sulphonated biphenyl dibenzofuran (CAS 133-057-91-7), supplied by Ciba-Geigy under the trademark Tinopal PLC Amylase 0.2 0.1 0.3 Cellulase 0.2 0.2 0.1 Protease 0.2 0.2 0.5 0.1 Perfume 0.1 0.4 0.3 0.25 0.3 Humidity and misc csp csp csp csp csp csp 100% 100% 100% 100% 00% 00%

Claims

NOVELTY OF THE INVENTION CLAIMS 1. A composition suitable for the treatment of textiles comprising a photobleaching component and a fluorescent whitening component, wherein the photobleaching component is capable of absorbing light to form an electrically excited photobleaching intermediate component; the electrically excited photobleaching intermediate component is capable of activating the molecular oxygen of its electron energy state of triplet oxygen, wherein the electrically excited photobleaching intermediate component has a lifetime of more than 50 microseconds. 2. The composition according to claim 1, further characterized in that the electrically excited photobleaching intermediate component has a lifetime greater than 100 microseconds. 3. The composition according to any of the preceding claims, further characterized in that the energy-excited photo-bleached Intermediate component has a life time greater than 200 microseconds. The composition according to any of the preceding claims, further characterized in that the electrically excited photobleaching intermediate component has a lifetime of more than 300 microseconds. The composition according to any of the preceding claims, further characterized in that the photobleaching component is a sulfonated phthalocyanine having an average degree of sulfonation of more than 3.0 to less than 4.0 which is complexed with a metal cation, and wherein the Sulfonated phthalocyanine is not substituted with a halide group. 6. The composition according to claim 5, further characterized in that the sulfonated phthalocyanine has an average degree of sulfonation of 3.8 to less than 4.0. The composition according to claim 1, further characterized in that the photobleaching agent is a sulfonated zinc phthalocyanine having an average degree of sulfonation of more than 3.0 to less than 4.0. The composition according to claim 7, further characterized in that the sulfonated zinc phthalocyanine has an average sulfonation grade of 3.8 to less than 4.0. 9. The composition according to claim 1, further characterized in that the photobleaching component is a sulfonated tin phthalocyanine, a sulfonated tin naphthalocinanine or a mixture thereof. 10. The composition according to claim 1, further characterized in that the photobleaching component is a sulfonated zinc naphthalocyanine, a sulfonated aluminum naphthalocyanine, a sulfonated tin phthalocyanine or any mixture thereof. The composition according to claim 1, further characterized in that the photobleaching component is a mixture of sulfonated zinc phthalocyanine and a sulfonated aluminum phthalocyanine, wherein the molar ratio of the phthalocyanine zinc solfulated to the phthalocyanine sulphonated aluminum is less than 3: 1. 12. The composition according to claim 11, further characterized in that the molar ratio of sulfonated zinc phthalocyanine to sulfonated aluminum phthalocyanine is less than 2: 1. The composition according to claim 1, further characterized in that the fluorescent whitening component is a substituted stilbenesulfonic acid or a salt thereof which is substituted by at least one portion of triazol-2-yl. The composition according to claim 1, further characterized in that the fluorescent whitening component is a molecule having the general formula: 15. The composition according to claim 1, further characterized in that the fluorescent whitening component is a molecule having the general formula: 16. The composition according to claim 1, further characterized in that the composition is a laundry detergent composition and further comprises a detersive surfactant, a builder, optionally bleach and optionally other auxiliary detergent components. A method for treating a fabric comprising the step of contacting a composition according to claim 1 with water to form an aqueous wash solution, and contacting the aqueous wash solution with a fabric.