JPH0425319B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to bleaching and cleaning compositions containing hypochlorite, and in particular to thickened bleach compositions, which are compositions with increased viscosity compared to pure aqueous solutions of alkali metal hypochlorite. It is. Thickened bleach compositions can be applied to vertical and inclined surfaces more easily and for longer periods of time than unthickened bleach compositions. It has many advantages in terms of adhesion. The performance of the thickened bleach composition is therefore great for toilet dishes, urinals,
It outperforms unthickened bleach compositions on vertical and inclined surfaces such as those found in sewers, wastewater pipes, etc. In recent years, a number of proposals have been made to provide thickened bleach compositions, for example to provide compositions with a viscosity at 25°C of greater than 10 centistokes by the addition of suitable thickeners. British Patent Specification No. 1329086 discloses a thickened aqueous alkali metal hypochlorite containing, in addition to hypochlorite, an alkali metal salt of a C ₈ to C ₁₈ fully saturated fatty acid and a hypochlorite soluble surfactant. Chlorate compositions are described, the surfactants being exemplified by amine oxides containing _C8 to _C18 alkyl groups. The amine oxides described herein are commercially available derived from naturally occurring fatty acids such as coconut acid, lauric acid, and myristic acid. British Patent Specification No. 1466560 describes a thickened aqueous alkali metal hypochlorite composition, in which the thickening involves the introduction of a hypochlorite solution into an interface with a certain sarcosine or taurine salt. By mixing the active agent with a combination of one or more other surfactants which may consist of certain soaps, quaternary ammonium compounds, amine oxides, betaines and/or alkanolamides. It will be achieved. British Patent Specification No. 1584379 discloses a sucrose surfactant consisting of one or more esters of long-chain fatty acids with sucrose and b another hypochlorite-soluble surfactant, such as a quaternary ammonium compound. , an amine oxide, a betaine, or an alkanolamine. GB Patent Specification No. 2051162A describes a thickened aqueous alkali metal hypochlorite composition comprising, in addition to hypochlorite, an amine oxide and an alkali metal alkyl sulfate. GB Patent Specification No. 2003522A discloses a thickened aqueous alkali containing a C ₈ to C ₂₀ branched amine oxide or a mixture of such amine oxides or a mixture of such branched and linear amine oxides. Describes metal hypochlorite compositions. Although thickening bleaches containing a single compound as thickener have been described (see, for example, GB Patent Specification No. 2003522A mentioned above), at least two, generally It has been discovered that it is economically advantageous to use organic compounds as thickening agents. A typical and well-known example is that described in British Patent Specification No. 1329086, in which thickening is achieved by a combination of soap and amine oxide in specified proportions. A particular type of single compound is essentially used as a thickener to create a thickened bleach composition, and the relative cost of that type of composition is greater than that of a composition containing two compounds as thickeners. Surprisingly, the applicant has now discovered that it is possible to achieve comparable costs. Accordingly, the present invention provides water; an alkali metal hypochlorite; and a linear amine oxide alone or a linear amine oxide or at least one oxide having at least 14 carbon atoms in the linear chain A thickened bleach composition comprising a chain amine oxide alone or a mixture of straight chain amine oxides. Ideally, the organic thickener should consist solely of substantially pure C ₁₄ or preferably C ₁₅ linear amine oxide. The compositions according to the invention do not contain significant amounts of organic thickeners other than linear amine oxides. Linear amine oxides containing more than 15 carbon atoms in the linear chain have limited solubility in alkali metal hypochlorite solutions. However, they can be incorporated into thickened bleach compositions if suitable solubilizers are used. Applicants have discovered that linear amine oxides containing fewer than 16 carbon atoms in the linear chain can be used for this purpose. Optionally, thickening bleaches according to the invention may contain additional ingredients often incorporated into compositions of this type, including caustic, alkali metal salts, fragrances and colorants. Thus, the composition according to the invention may contain a caustic alkali, such as sodium hydroxide, and/or an alkali metal salt, such as sodium chloride, each present in an amount of 0.5 to 5% by weight. preferable. Flavoring and/or coloring agents may also be present in the composition. The compositions of the invention preferably have a viscosity of at least 10 centipoise at 25°C as measured with an Ostwald viscometer and a cloud point above 35°C. The following examples further illustrate thickened bleach compositions according to the invention, in which parts and percentages are by weight and all viscosities were set at 25°C with an Ostwald viscometer. Example 1-14 _A large number _of A thickened bleach composition was created. A similar composition, designated Composition A, containing no amine oxide was also prepared for comparison purposes. Details of these compositions, viscosities and cloud points are given in Table 1. The results show that the thickening behavior of linear amine oxides increases with increasing chain length.

[Table] Examples 15-26 Sodium hypochlorite, sodium hydroxide, sodium chloride and
A number of thickened bleach compositions were made by mixing C ₁₂ , C ₁₄ and C ₁₆ linear amine oxide mixtures in cold water. Details of the compositions and their properties are shown in Table 2, and the results illustrate the solubilizing effect of lower linear amine oxides on formulations containing C ₁₆ linear amine oxides. These examples provide a technologically and economically acceptable thickening bleaching agent with a single organic thickener (which may be different from other (consisting of a single linear amine oxide or a mixture of linear amine oxides) in the absence of organic thickeners. Together, these examples demonstrate that acceptable thickening can be achieved using amine oxides in which the alkyl groups are all linear groups.

【table】

Claims (1)

[Scope of Claims] 1 Water; an alkali metal hypochlorite; and an amine oxide or at least one linear amine oxide having at least 14 carbon atoms in the linear chain. or a thickened bleach composition comprising: an organic thickener comprising a mixture of linear amine oxides; 2. The composition according to claim 1, wherein the organic thickener is a _C14 or _C15 linear amine oxide alone. 3. The organic thickener comprises one or more linear amine oxides having at least 16 carbon atoms in the linear chain, and the composition further comprises a solubilizer for the organic thickener. , the composition according to claim 1. 4. A composition according to claim 3, wherein the solubilizer is a linear amine oxide having less than 16 carbon atoms in the linear chain.