MXPA98001081A - Reproductive cleaning compositions pigmented with tixotropi properties - Google Patents

Abstract

A hard surface cleaning composition containing pigmented bleach comprises an alkali metal hypochlorite, bentonite clay, mono- (long chain alkyl) -tertiary amine, an alkali metal salt, a pH stabilizer to achieve a pH of 11. or greater, an alkali metal alkyl arcosinate, an alkylbenzenesulfonate and an inorganic pigment which is preferably ultramarine blue. The cleaning composition has excellent color stability as well as phase stability and hypochloride stability

Description

REPEPTIC CLEANING COMPOSITIONS PIGMENTED WITH THIXOTROPIC PROPERTIES FIELD DB THE INVENTION This invention relates to compositions containing a thickened bleach liquid useful for the cleaning of rough surfaces and, in particular, to those compositions that include stable pigments in the presence of bleaches.

BACKGROUND OF THE INVENTION Thickened bleaching compositions offer a number of advantages over non-thickened bleaching compositions. The more viscous and thicker solutions adhere to vertical and inclined surfaces for a longer period, and the disinfectant activity of the thick compositions is more effective in the chosen areas. In order to provide a thickened hypochlorite composition having an acceptable shelf life, the decomposition rate of the alkali metal hypochlorite and the phase behavior of the composition must be taken into account. As is known, the degradation of alkali metal hypochlorite can be illustrated by the following equation: P1087 / 98MX NaOCI NaCl +% 02 Many conventional thickening agents accelerate the degradation of hypochlorite and, consequently, its use in hypochlorite compositions is problematic because the resulting hypochlorite composition tends to separate into two or more phases, especially under high temperature conditions. Many of the thickening agents are unstable in the presence of alkali metal hypochlorite. Therefore, it is not easy to achieve sufficient viscosity in hypochlorite compositions using conventional agents and additives and to provide, in addition, a hypochlorite composition with adequate stability. It is also desirable, for aesthetic and commercial reasons, to provide cleaning compositions containing thickened whiteners that exhibit a coloration that distinguishes them. The scope of stable dyes in the presence of bleaches is quite small due to the tendency of organic dyes to degrade against strong oxidants. U.S. Patent No. 4,474,677 (Foxlee) suggests using certain halogenated cupric phthalocyanine pigments with aqueous alkali metal hypochlorite compositions. While this class of pigments is P1087 / 98MX considered stable in the presence of bleaches, the slow degradation of the pigment molecule releases copper that catalyzes the degradation of hypochlorite. U.S. Patent No. 4,271,030 (Brierley) discloses a suspension of ultramarine blue using calcium soap flakes. The use of calcium soap in flakes is not convenient due to the high concentration required, 50% by volume of the composition or, in terms of cleaning, because it tends to precipitate on rough surfaces. U.S. Patent No. 4,952,333 (Cramer) discloses a bleaching composition that revives colors and uses polymers to suspend ultramarine blue pigment in an emulsified polymer matrix. This composition, however, is not a good cleaner for rough surfaces due to its low detergent capacity. U.S. Patent No. 4,917,814 (MacIntyre) describes the use of cobalt aluminate with thickened and colored hypochlorite solutions. Cobalt pigments have better suspension properties than ultramarine blue. It should be noted, unless proven otherwise, that under conditions of higher temperatures than those used by MacIntyre, the thickened surfactant compositions lose viscosity and allow the pigment to settle. Consumer products must be stable when exposed to P1087 / 98MX such temperatures during the storage and distribution period.

SUMMARY INVENTION This invention provides thickened hypochlorite compositions with improved rheological properties capable of stably suspending inorganic pigments. The thickening system consists of a reopéctica mixture of surfactant ingredients and clays at low speed of bearing and thixotropic effort at high speed of cutting effort, which allows the product to be easily dispensed from a container to proceed with the cleaning of rough surfaces. By definition, reopexy and thixotropy are opposite flow properties. The presence of both properties in the same fluid is particularly advantageous. An unlimited number of examples of inorganic dyes can be used, including ultramarine blue, cobalt aluminate blue, titanium dioxide and calcium carbonate. This invention concentrates on the use of ultramarine blue, a preferred pigment for its acceptance among consumers, low toxicity and color intensity in comparison with other pigments. The compositions behave as highly structured liquids and exhibit flow properties P1087 / 98MX unique and unexpected. This occurs despite the low solids content, less than 10%, of the formula compared to other structured liquids, many of them known in the category of liquid detergents for laundry. This feature helps solve the problem of pigment sedimentation without losing the properties of thin-film fluid flow that allows products such as toilet cleaners to achieve greater surface coverage. The composition shows good phase stability and is stable in the presence of hypochlorite. The compositions of the invention comprise: a) an alkali metal hypochlorite, preferably sodium hypochlorite, b) bentonite clay, c) a tertiary amine oxide having a long chain alkyl group composed of 10 to 16 carbon atoms and two lower alkyl groups, d) an alkali metal salt, preferably sodium chloride, e) a pH stabilizer to reach a pH of 11 or higher, f) an alkali metal Cis-Cis alkyl sarcosinate, g) an alkylbenzene sulfonate C10 -C16 linear chain and P1087 / 98MX h) an inorganic pigment, preferably ultramarine blue. The desired rheological properties and the phase stability described above are achieved by carefully mixing the clay, the surfactants and the electrolytes. In particular, the molar ratio between the tertiary amine oxide (c) and the alkylbenzene sulfonate (g) should be between 5: 1 and 11: 1. Compositions without useful pigments analogous to the compositions of this invention can be prepared without the pigment (h). The viscosity of the composition can vary between 200 cps and 1000 cps. The preferred range is 300 to 500 cps.

BRIEF DESCRIPTION OF THE DRAWINGS Figures 1 and 2 are graphs showing the rheological properties of a preferred embodiment of this invention. Figures 3 and 4 are graphs showing certain rheological properties of a formulation according to the present invention (Figure 3) and comparable properties of a similar composition without clay (Figure 4).

P1087 / 98MX DESCRIPTION OF THE INVENTION The composition of the invention is a bleaching composition of hypochlorite thickened in a single phase, stable in the presence of hypochlorite capable of adhering to vertical or inclined surfaces for longer periods than the diluent compositions. The composition is an effective agent for disinfecting and removing stains. The high level of stability in the presence of hypochlorite and the phase behavior of the single solution allow the shelf life of the composition to be acceptable. The compositions further include an organic pigment in suspension. In these pigmented compositions, the stability of the color, especially when dealing with ultramarine blue, is singularly advantageous. The alkali metal of the alkali metal hypochlorite is preferably selected from lithium, potassium or sodium. In terms of costs and availability, sodium hypochlorite is currently preferred. The alkali metal hypochlorite may have other products derived from the manufacturing process without adversely affecting the composition. The amount of alkali metal hypochlorite used ranges from 0.5 to 10% by weight, preferably between 1.0 and 5.0% by weight and more preferably between 1.5 and 3.0% by weight.

P1087 / 98MX weight. Bentonite clay is a colloidal hydrated aluminum silicate clay found in North America. This clay is mainly composed of montmorillonite (AI2O3 • 4SÍO2 -H 0) and, in general, contains a little magnesium, iron and calcium carbonate. While in the present invention it is preferred to use bentonite clay, other clays of structure and / or similar properties can also be used. The amount of bentonite clay present in the composition should range between 0.15 and 1.5% by weight, preferably between 0.25% and 1.0% by weight. The tertiary amine oxide has the following formula: where R is an alkyl group containing from 10 to 16 carbon atoms and each R 2 and R 3 is a lower alkyl group containing from 1 to 3 carbon atoms. R, R and R3 may be straight or branched chain; R may contain an even or odd number of carbon atoms. Amine oxides of different chain length can be used, P1087 / 98MX where one or more lengths may predominate. Preferably, the tertiary amine oxide is selected from a group consisting of myristyldimethylamine oxide, lauryldimethylamine oxide or mixtures of said substances. Miristyldimethylamine oxide is more preferably used. The amount of tertiary amine oxide used is between 0.5 and 2.5% by weight, more preferably between 0.9 and 1.8% by weight and more preferably still between 1.0 and 1.5% by weight. The alkali metal salt can be selected from the alkali metal salts soluble in water and their mixtures; as the alkali metal, lithium, potassium or sodium is preferred, and as an anion ion, a halide (such as, for example, chloride, fluoride, bromide and iodide). More preferably, the alkali metal salt is selected from a group consisting of sodium chloride, lithium chloride, potassium chloride and mixtures of these substances. The most preferred alkali metal salt in terms of costs and availability is sodium chloride which can be used in different quantities in order to reduce the degradation of hypochlorite, with the only limitation of avoiding the "desalting" of the solution, in which case the surfactants become insoluble in water). If sodium chloride is used, the preferred amount is found P1087 / 98MX comprised between 0.25 and 2.0% by weight, more preferably between 0.5 and 1.5% by weight. While any pH stabilizer can be used as long as it does not affect the stability and viscosity of the composition, it is preferred to include an alkali metal hydroxide in the composition as a pH stabilizer. Other pH stabilizers can be used, for example, those that include carbonate buffers. The alkali metal of the preferred hydroxide may be lithium, potassium or sodium. Sodium hydroxide and potassium hydroxide are especially useful as pH stabilizers because of their cost and availability, with sodium hydroxide being most preferred. The alkali metal hydroxide is incorporated into the composition in an amount effective to bring the pH of the composition to a level of at least 11, more preferably from 12 to 13.5 and more preferably from 12 to 13. The alkali metal alkyl sarcosinate can be represent by the following formula: CH3 R4 - C - N - CH2COO M + P1087 / 98MX where R4 is a straight or branched chain C? Or C Ci6 alkyl group and M is an alkali metal cation (such as, for example, lithium, potassium or sodium). Sodium lauroyl sarcosinate is most preferably used. The amount of alkali metal alkyl sarcosinate that can be used ranges from 0.10 to 0.75% by weight, more preferably from 0.12 to 0.60% by weight and more preferably even from 0.15 to 0.30% by weight. The straight chain alkylbenzene sulphonate of 10 to 14 carbon-alkali metal atoms preferably contain potassium, lithium or sodium as the alkali metal. Sodium dodecylbenzenesulfonate is most preferably used. Preferably the amount of sulfonate used is between 0.08 and 0.8% by weight, more preferably between 0.1 and 0.5% by weight and more preferably still between 0.15 and 0.4% by weight. In these pigmented compositions, the preferred pigment is ultramarine blue which is an organic silicate. Although this material is inert to the oxidation of hypochlorite and does not catalyze the decomposition of hypochlorite, it is insoluble and must be suspended in the hypochlorite solution. Said suspension can not be achieved by distributing particles of ultramarine blue in hypochlorite solution because the pigment has a density of 2.35 and sediments even when the size of the P1087 / 98MX particles are very fine. The thickening system used in the composition of the present invention provides excellent suspension conditions for ultramarine blue pigment particles. The amount of ultramarine blue in the composition of the invention ranges from 0.01 to 0.50% by weight, preferably 0.05%. The molar ratio between the tertiary amine oxide and the alkali metal alkylbenzene sulfonate should be between 5: 1 and 11: 1; preferably between 6: 1 and 10: 1 and more preferably between 7: 1 and 9: 1. The composition offers higher viscosity for alkali metal hypochlorite bleaches while providing a commercially acceptable pigmented composition with excellent color stability. While not intended to support any particular theory, it is believed that the primary interaction occurs between the components corresponding to the clay and the amine oxide of the formula. In the preferred embodiment of the example presented below, as a consequence of the combination of clay, sodium chloride and sodium hydroxide solution the clay platelets are aligned according to a chant-face structure. Part of the amine oxide acts as a stabilizer of the structure by ionic or steric interaction. The ingredients P1087 / 98MX sulfonate and sarcosinate surfactants combine with the rest of the amine oxide to form organic structures or micelles that increase viscosity. The theory further indicates that the micelles interact with the structure of the clay to give the composition unique rheological properties. The present invention provides a commercially advantageous colored thickening system having thixotropic properties that allow the product to be dispensed easily, especially if an atomizer container is used. The cleaning products employing this thickening system have a degree of quiescent viscosity sufficient to keep the inorganic pigment particles in suspension. The invention will be better understood if reference is made to the following examples which are included for illustrative purposes and should not be construed restrictively.

Example 1 A blue manual surface cleaner containing the following ingredients was prepared, all percentages correspond to percentages by weight.

P1087 / 98MX Ingredient bentonite clay (Gelwhite H) 1.00% ultramarine blue 0.05% sodium chloride 1.00% sodium hydroxide 2.50% myristyldimethylamine oxide 5.60% sodium hypochlorite 2.50% sodium dodecylbenzenesulfonate 0.72% sodium lauroyl sarcosinate 1.00% fragrance 0.065% deionized water csplOO% To prepare the composition of the cleaner was placed in the main container (1) Gelwhite H, montmorillonite clay (Southern Clay Products) in water and a homogenizer was used until the clay was completely dehydrated. Ultramarine blue was added and the composition was stirred. In a separate vessel (2), sodium chloride and a 25% sodium hydroxide solution were dissolved in water. While stirring the container the remaining ingredients were added in the following order: Ammonyx MO, a solution of myristyldimethylamine oxide, Stepan Company; a 16.67% sodium hypochlorite bleach solution; Biosoft D-40, a solution of sodium dodecylbenzenesulfonate, Stepan P1087 / 98MX Company; and Hamposyl L-30, a solution of sodium lauroyl sarcosinate, W. R. Grace & Company Figure 1 shows the rheological profile of this preferred embodiment. It summarizes the cutting effort as a function of time in four speeds of cutting effort. The formula presents reopécticas properties so much to 1 as to 10 seg ~ in constant conditions of effort of cut. The thixotropic character is evident at 50 sec. "Figure 2 captures the increase in tension at the start of the flow at the first shear rate, and the tests were performed with a Rheometrics Scientific OFSII rheometer., 50 mm parallel plate, 0.9 mm spacing, machining 316SS, 25C, force balance adjustment of 0.002-10 g / cm. An analogous formula that does not include clay or pigments shows radically different rheological properties. See Figures 3 and 4. If one examines the path of G ', a measurement of the elastic resistance of a viscoelastic fluid, and G ", a measurement of the mechanical energy dissipated during the deformation of a structured fluid, it will be seen that the formula that presents clay behaves like a highly structured fluid with a significant dependence on effort.The analogous formula behaves like a predominantly viscous fluid with P1087 / 98MX a little significant dependence on effort. This difference denotes a significant interaction between the clay component and the surfactant ingredients present in the formula.

The 2-s compounds The following additional compositions were prepared according to the procedure described in Example 1: P1087 / 98MX Comparative Example A cleaning composition containing ultramarine blue pigment but not containing clay was prepared. The sedimentation characteristics of the pigment were compared with the composition of Example 1. The comparative composition was prepared according to the method applied in Example 1. The two compositions were kept in a quiescent state for a period of 6 weeks at 40 ° C. The following table shows the ingredients of the compositions and the relevant rheological data.

P1087 / 98MX TABLE These data indicate that, unlike the excellent suspension characteristics of Example 1, in the Comparative Example containing only half the pigment, it sediments within three weeks.

P1087 / 98MX

Claims (6)

NOVELTY OF THE INVENTION Having described the present invention, it is considered as a novelty and, therefore, the content of the following CLAIMS is claimed as property! 1. An aqueous pigmented and thickened hypochlorite composition CHARACTERIZED BECAUSE it comprises the following ingredients expressed as a percentage by weight a) between 0.50 and 10% of an alkali metal hypochlorite; b) between 0.25 and 1% bentonite clay; c) between 0.50% and 2.5% of a tertiary amine oxide represented by the following formula where R is an alkyl group containing from 10 to 16 2 3 carbon atoms and each R and R is an alkyl group containing from 1 to 3 carbon atoms; d) between 0.25 and 2.0% of an alkaline metal salt; e) sufficient amount of a pH stabilizer to reach a pH of 11 or higher P1087 / 98MX f) between 0.10 and 0.75% of an alkaline metal sarcosinate represented by the following formula where R is an alkyl group containing 10 to 16 straight-chain carbon atoms and M is lithium, potassium or sodium; g) between 0.08 and 0.80% of an alkali metal alkylbenzene sulphonate whose alkyl group is branched chain and has between 10 and 14 carbon atoms and h) between 0.01 and 0.5% of an inorganic pigment with a molar ratio between c) and g) varies between 5: 1 and 11.1. 2. The hypochlorite composition of claim 1, CHARACTERIZED BECAUSE the pigment of component h) is ultramarine blue. 3. The hypochlorite composition of claim 2, CHARACTERIZED BECAUSE: a) the alkali metal hypochlorite is sodium hypochlorite; c) the amine oxide is lauryldimethylamine oxide, P1087 / 98MX myristyldimethylamine oxide or a mixture of said substances; d) the alkali metal salt is sodium chloride; e) the pH stabilizer is sodium hydroxide in sufficient quantity to reach a pH comprised between 12 and 13.5, f) sodium sarcosinate is sodium lauroyl sarcosinate; g) the alkali metal alkylbenzene sulphonate is sodium dodecylbenzenesulfonate. 4. The hypochlorite composition of claim 3, CHARACTERIZED because in component c) the amine oxide is lauryldimethylamine oxide. 5. The hypochlorite composition of claim 4, CHARACTERIZED BECAUSE it comprises the following ingredients expressed in percentages by weight: a) between 1 and 5% sodium hypochlorite, b) between 0.25 and 1% bentonite clay . c) between 0.9 and 1.8% of lauryl dimethylamine oxide. d) between 0.5 and 1.5% sodium chloride f) between 0.12% and 0.60% sodium lauroyl sarcosinate, g) between 0.10% and 0.50% sodium dodecylbenzenesulfonate, and h) 0.05% ultra-blue pigment P1087 / 98MX where the molar ratio between c) and g) is from 6: 1 to 10: 1. 6. The hypochlorite composition of claim 5, CHARACTERIZED BECAUSE it comprises the following ingredients expressed in percent by weight: a) between 1.5 and 3.0% sodium hypochlorite, c) between 1.0 and 1.5% lauryl dimethylamine oxide , f) between 0.15 and 0.30% sodium lauroyl sarcosinate and g) between 0.15 and 0.40% sodium dodecylbenzenesulfonate, where the molar ratio between c) and g) is between 7: 1 and 9:

1. P1087 / 98MX