CZ409798A3 - Preparation for cleansing cloakrooms - Google Patents

Abstract

Improved foam behaviour and a reduction in stickiness during manufacture is shown in lavatory blocks which comprise 2-15 wt.% of oily liquid perfume, 2-30 wt.% of halogen bleaching agent, 3-15 wt.% of primary alkyl sulphate, and, 15-50 wt.% of alkyl benzene sulphonate.

Description

The invention relates to a toilet cleaning agent for placement under the rim of the bowl or in a water tank.

State of the art

Toilet cleaning agents are known which are designed to be placed under the rim of the bowl so that when flushing, water from the reservoir flows over these agents and a certain proportion of such agent dissolves. Furthermore, cleaning agents for water reservoirs are known which slowly dissolve in the water contained in the reservoir.

These agents produce foam, often have a pleasant scent and may also have bactericidal properties. This effect can be caused by bleaching agents, for example, substances that release chlorine, another type are agents that can release oxygen, for example from peroxides, or also quaternary ammonium compounds or halogenated materials that do not release chlorine salts when used.

International patent application WO 92/03532 (Jeyes) describes a composition comprising a wetting agent and a dissolution retarding agent or filler. Typically, the wetting agent is an anionic wetting agent in an amount of 5 to 85% by weight, based on the total weight of the composition.

Various anionic surfactants are used for the products placed under the rim of the bowl. For example, mixtures of two or more primary alkyl sulfates PAS, alkyl sulfates • 9

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AS, optionally branched chain, secondary alkyl sulfates SAS, alkyl ether sulfates AES and alkyl benzene sulfonates LAS or they may be essentially pure surfactants. According to US 4,874,536, mixtures of the AS/LAS type can be used in compositions that are free of oxygen-containing bleaching agents. International patent application WO 95/11958 describes the use of PAS/AES mixtures, again in compositions that are free of bleaching agents. According to WO 96/14,392, mixtures of the EAS/LAS type can be used, again in compositions that are free of bleaching agents. EP 619,367 describes the presence of a PAS/LES mixture in compositions that do not contain bleaching agents. Similarly, EP 184,416 describes a LAS/PAS mixture used in compositions that do not contain bleaching agents. Furthermore, FG 2 169 612 describes the use of LAS/PAS in bleach-free composition blocks and GB 2 178 442 describes the use of LAS/PAS in compositions containing two halogen-based bleaches.

EP 462 643 (Unilever) describes how to improve block compositions containing halogen-based bleaches by adding a liquid perfume in the form of an oil to the composition for the production of such compositions. It has been found that a problem associated with the production of such compositions is that, in the presence of bleaches, a relatively large amount of perfume must be used to ensure stability over a longer period of time. In addition, the bleach also replaces the proportion of filler that is usually present. The presence of perfume and bleach results in a sticky composition which is then difficult to process by the extrusion process usually used to produce such block compositions.

A product of this type, once placed in place, should produce a rich lather for at least the first 50 to 80 flushes, and should continue to produce lather for a significant portion of the product's life.

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It has now been found that improved foaming and/or a substantial reduction in stickiness of bleach and perfume-containing compositions can be achieved by using a certain surfactant system which contains a primary alkyl sulfate PAS together with an alkyl benzene sulfonate LAS in a certain amount.

The essence of the invention

The essence of the invention is a toilet cleaning agent in the form of blocks, which contains

a) 2 to 15% by weight of liquid perfume in the form of oil,

b) 2 to 30% by weight of halogen-based bleach,

c) 3 to 15% by weight of primary alkyl sulfate and

d) 15 to 50% by weight of alkylbenzene sulfonate.

Without wishing to be bound by theory, it is likely that PAS and LAS form a phase capable of adsorbing a certain proportion of the perfume present and preventing stickiness. This would facilitate the manufacture of compositions of this type by extrusion in the form of a rod which is then divided into individual blocks. The combination of PAS and ABS also appears to promote foaming and the release of the perfume from the block.

According to one embodiment of the invention, in the production of a toilet cleaning composition in the form of a block containing 2 to 15% by weight of a liquid perfume in the form of an oil and 2 to 30% by weight of a halogen-based bleach, 3 to 15% by weight of a primary alkyl sulfate and 15 to 50% by weight of an alkylbenzene sulfonate are used to reduce stickiness.

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The preferred ratio of primary alkyl sulfate to alkylbenzene sulfonate, PAS:LAS, is 1:1 to 1:5, preferably about 1:3. Particularly suitable materials are PAS with an average alkyl chain length of 10 to 16 carbon atoms and alkylbenzene sulfonate also with an average alkyl chain length of 10 to 16 carbon atoms.

The toilet cleaning compositions according to the invention in block form preferably contain less than 5% by weight of another wetting agent and are particularly preferably free of any other wetting agent.

The material for the production of these blocks may further comprise agents to facilitate processing during extrusion. These may be oils, both mineral and silicone oils, esters, for example methyl decanoate, liquid ketones, such as 2-decanone, liquid tertiary alcohols, such as 2-methylhexan-2-ol or polybutene. A suitable agent is an alkoxylated alcohol, in a preferred embodiment it is an ethoxylated alcohol. This alkoxylated alcohol is preferably used in an amount of 0.75 to 2% by weight. The ethoxylated chain preferably has a length of 40 to 60 carbon atoms, preferably 50 carbon atoms. Suitable materials include Empilan KM 50/KF (TM) (Alhright and Wilson). Another useful agent to facilitate processing is PEG-monostearate. A suitable material is, for example, PEG 4000 Monostearate (100%) (DAC). Preferably, however, the compositions of the invention are free of said processing aids.

The toilet cleaning compositions in block form according to the invention typically contain 0 to 50% by weight of inert filler and/or filler in the form of electrolyte. Preferably, this is 5 to 50% by weight of filler. Suitable fillers are, for example, ionic soluble fillers and also inert insoluble fillers. Suitable fillers include urea, sodium, magnesium and calcium carbonates, sodium chloride, borax, talc and sodium, magnesium or calcium sulphate. Preferred ionic fillers are in particular sodium sulphate. The advantage of adding at least partially soluble salts of barium, cadmium, copper, iron, manganese or nickel to modify the shelf life of the composition has been demonstrated.

The preferred inert filler is calcium carbonate. The total amount of filler is in the range of 20 to 50% by weight, based on the total weight of the product, preferably 10 to 20% by weight of ionic filler and 10 to 20% by weight of inert filler. It is particularly preferred to use a mixture of sodium sulfate and calcium carbonate in a weight ratio of 50:50. Both calcium carbonate and sodium sulfate are typically present in the product in an amount of 13 to 17% by weight. In the case of compositions for storage in a water tank, the inert filler is not present in order to avoid the formation of residues and deposits after dissolution of the composition.

In the case where the inert filler is somewhat soluble, such as calcite, it is advisable to use this filler in the form of particles with a narrow size range so that dissolution and re-precipitation of the calcite is minimized. A suitable material of this type is Calcitec SG (TM).

Suitable halogen-based bleaches are those which are at least partially soluble in water. Active chlorine bleaches are particularly preferred. Active chlorine bleaches which are at least partially soluble in water and suitable for use in the present invention include chlorinated cyanurates, phthalimides, p-toluenesulfonamides, azodicarboamides, hydantoins, glycouracils, amines and melanins.

Other agents capable of releasing chlorine may be used, such as calcium hypochlorite. Preferred agents of this type are alkali metal cyanurates.

A particularly preferred bleaching agent will comprise at least one N-chlorinated derivative of cyanuric acid, preferably sodium dichlorocyanurate NaDCCA. The bleaching agent is preferably present in an amount of 10 to 25, preferably about 15% by weight. A suitable bleaching agent is, for example, Oxidan DCN/WSG (TM) (Sigma).

The compositions according to the invention in the form of blocks preferably contain 4 to 10% by weight of perfume and in particular 5 to 8% by weight of perfume. These are preferably liquid perfumes in the form of oils, as described in EP 167 210. It is clear that the perfume used must be stable in the presence of the selected water-soluble bleaching agent based on active chlorine. Suitable materials are, for example, substituted quinolines, cedryl methyl ether and cineole.

Commercially available perfumes in oil form can be easily tested by contacting them with a water-soluble bleaching agent that releases active chlorine. Examples of permanent commercial perfumes include Verdeo 898, Bonanza 048 and Ponderosa 431 (all IFF), and LB 132 (Quest). Particularly preferred perfumes are Icebreaker Super Mod, Oxygen Supra Mod, Motebianco Supra, Montebianco Turbo 7 and Lemonfit Supra (TM) (Givaudan Roure).

The compositions of the invention may contain minor amounts of other optional ingredients such as dyes and/or bleaches. These materials should be selected to be compatible with the bleach and not to react with it to a significant extent. For example, Sudan Yellow 150 (TM) (Sandoz) and Colany Breen Green (TM) have been found to be acceptable dyes.

9 » 9 9 1 (Hoechst) and Dispers Blue (TM) (BASF). A suitable bleaching agent is titanium dioxide. Another optional ingredient may be a wetting agent, promoting foaming, such as an amine oxide.

The compositions of the invention in block form can be produced by extrusion in a known manner. The ingredients are thoroughly mixed and the resulting material is then extruded in the form of a rod which is divided into blocks of the desired length.

The term block is not intended to limit the shape of the resulting product. For placement under the rim of a bowl, the rod is usually divided into sections whose length is considerably greater than their diameter, but for placement in a water tank, the rod is divided into much shorter sections. The material of the rod is preferably homogeneous and its composition is the same in all parts.

The inventive block-shaped devices for placement under the rim of the bowl are typically used in containers that are hung from the rim of the bowl so that when the water is flushed, the container flows through the container and a portion of the block dissolves. These containers are typically provided with a hook of a suitable size for hanging over the rim of the bowl.

In a particularly suitable composition, the composition according to the invention contains the following components:

component % wt.

primary alkyl sulfate 4 until 15 alkylbenzenesulfonate 15 until 50 at least one N-chlorinated derivative cyanuric acids, such as NaDCCA 2 until 30 sodium sulfate, calcium carbonate, or a mixture 10 until 50 perfume 2 until 15 dye and/or bleach 0 until 5

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The practical embodiment of the invention will be illustrated by the following examples, which are not intended to limit the scope of the invention.

Examples of embodiments of the invention

The ingredients listed in Table 1 below were mixed in the proportions indicated and extruded onto a rod, which was then divided into blocks. All proportions and percentages are by weight. The invention is illustrated by Examples 1, 2 and 4, Example 3 is comparative. The following materials were used in the manufacture of the compositions:

nonionic surfactant auxiliary agent anionic surfactant ABS

PAS bleaching agent ionic filler inert filler

Empilan KM 50/KF (TM, Albright and Wilson)

PEG 4000 Monostearate (100%, DAC)

Nansa HS 80/GPF (TM, Albright and Wilson)

Empicol LZ-V (TM, Albright and Wilson) Oxidan DCN/WSG (TM, Sigma) Sodium sulfate Calcium carbonate (Calcitec SG,

TM, Mineraria Sacilese).

The perfume Montebianco Turbo 7 (TM, Givaudan Roure) was present at 6.5 to 7%, titanium dioxide as a bleach at 0.071% and the dye Colanyl Green (Hoechst) at 0.024% or less.

The composition is listed at the top of the table, the foam height at the bottom. The foam height is listed in cm immediately after flushing.

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Table 1

example 1 2 3 4 means bleaching agent 15 15 15 15 ionic filler 15 15 10.2 15.98 inert filler 7.3 14.5 4.36 14.7 perfume 6.5 6.5 6.5 6.5 dye 0.024 0.024 0.024 0.024 bleach - - 0.07 - aid - 1.0 - nonionic surfactant - - 3.0 - PASSPORT 10 10 - 10 ABS 35 30 47.8 30 water . up to 100 up to 100 under 10 0 up to 100 results flush foam height 1 2.4 2.5 1.0 2.5 5 3.3 3.5 1.5 3.5 15 3.4 3.5 3.0 3.5 30 4.0 4.0 3.0 4.0 50 4.0 4.0 3.0 4.4 105 4.5 4.5 3.3 5.0 150 4.7 4.7 3.3 5.0 210 4.5 4.5 3.2 4.6 250 4.0 4.0 3.0 4.5 300 3.5 3.5 3.0 4.0 350 3.0 3.0 2.0 3.5 400 2.5 2.5 2.0 2.8 500 2.0 2.0 1.3 2.0 600 0.5 0.5 0.5 0.5

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From the results shown in Table 1, it is apparent that the block compositions containing the conventional wetting system of Comparative Example 3 produce significantly less foam than the compositions of Examples 1, 2 and 4 which contain PAS. During the processing of the mixture to produce these compositions, it was also observed that the mixture was significantly less sticky for the compositions of Examples 1, 2 and 4 than for the standard compositions of Example 3.

Claims (5)

A toilet cleansing composition in the form of blocks, comprising (a) 2 to 15% by weight of liquid perfume in the form of oil, (b) 2 to 30% by weight of a halogen-based bleach, (c) 3 to 15% by weight of a primary alkyl sulphate; and d) 13 to 50% by weight of alkylbenzene sulfonate. 2. A composition according to claim 1, wherein the halogen-based bleaching agent is selected from the group of chlorinated cyanurates, phthalimides, p-toluenesulfondamides, azodicarbonamides, hydantoins, glycoluracil, amines, melamines and mixtures thereof. 3. A composition according to claim 1 comprising 4 to 15% by weight of primary alkyl sulfate, 15 to 50% by weight of alkylbenzene sulfonate, 2 to 30% by weight of at least one N-chlorinated cyanuric acid derivative, 10 to 50% by weight of sodium sulphate, calcium carbonate or a mixture thereof, 2 to 15% by weight of a perfume; and 0 to 5% by weight of colorant and / or optically brightener. «4» · fl · fl 4. A composition according to claim 3 wherein the N-chlorinated cyanuric acid derivative is sodium dichlorocyanurate. Use of 3 to 15% by weight of primary alkyl sulfate and 15 to 50% by weight of alkylbenzene sulfonate to reduce the tackiness of the composition in the manufacture of toilet cleansing compositions containing 2 to 15% by weight of liquid perfume in the form of oil and 2 to 30% by weight of bleaching agent. azi halogens.