WO1999058635A1

WO1999058635A1 - Bleaching and disinfecting agents

Info

Publication number: WO1999058635A1
Application number: PCT/EP1999/002903
Authority: WO
Inventors: Jaume Josa; Clement K. Choy
Original assignee: Henkel Kommanditgesellschaft Auf Aktien
Priority date: 1998-05-08
Filing date: 1999-04-29
Publication date: 1999-11-18
Also published as: EP1075506B1; EP1075506A1; ES2244196T3; DE59912187D1; ATE297978T1; CN1299405A

Abstract

The invention relates to new bleaching and disinfecting agents which contain, in relation to the agents, (a) between 1 and 6 weight % alkali metal hypochlorites, (b) between 0.5 and 5 weight % alkylether sulfates and/or amino oxides, (c) between 0.5 and 2 weight % alkali metal hydroxides, (d) between 0.5 and 3 weight % electrolyte salts, (e) between 0.01 and 1 weight % tetrahydromyrcenol, and (f) between 0 and 4 weight % fatty acid salts, provided that the above quantities are completed to 100 weight % by the addition of water and possibly other aids and additives. These preparations have a sufficiently high viscosity as well as a very good storage stability, dispersing power for colour pigments and stability in chlorine.

Description

Bleach and disinfectant

Field of the Invention

The invention relates to new aqueous bleaching and disinfecting agents containing alkali metal hypochlorites, surfactants, electrolyte salts and tetrahydromyrcenol in defined proportions.

State of the art

In the past, such bleaches based on alkali metal hypochlorites have proven themselves in the areas of hygiene and disinfection, but also in textile treatment, which have a remarkable viscosity and are therefore suitable for the treatment of horizontal as well as inclined and, above all, vertical surfaces . The viscosity of these agents has the effect that the contact time between them and the surfaces to be treated is considerably longer than in the case of commercially available liquid products which flow off rapidly from the surface.

There has been no shortage of attempts in the past to provide such viscous bleaching and disinfecting agents. For example, it has been found that certain surfactants or surfactant mixtures have a thickening effect on aqueous hypochlorite solutions. For example, EP-A 0274885 (IG) recommends the use of mixtures of linear and branched amine oxides. According to the teaching of EP-A 0145084 (Unilever), mixtures of amine oxides with soaps, sarcosinates, taurides or sugar esters can also be used for this purpose. The documents EP-A 0079102, EP-A 0137551 and EP-A 0447261 (Unilever) disclose the use of amine oxides with soap or sarcosinate and other anionic surfactants, for example alkyl sulfates, alkyl ether sulfates, secondary alkane sulfonates or alkylbenzenesulfonates as a thickening component. EP-A 0156438 reports on the use of alkylarylsulfonates as thickeners in aqueous bleaching agents which contain certain stilbene dyes as optical brighteners. ES-A 8801389 (Henkel Iberica) relates to bleaching agents based on aqueous hypochlorite solutions which contain, as the surfactant component, predominantly alkyl ether sulfates and also small amounts of amine oxides. From EP-A1 0447261 aqueous bleaching agent compositions are also tongues containing sodium hypochlorite and anionic surfactants known. However, the hypochlorite concentration of these agents is 0.1 to 8 and preferably 0.5 to 5% by weight of active chlorine. In German Patent DE-C1 4333100, the applicant has already proposed stable and sufficiently viscous aqueous bleaching and cleaning agents based on hypochlorites, fatty alcohol ether sulfates and amine oxides, which contain amine oxide phosphonic acids as a mandatory component. Although these contribute significantly to the thickening of the agents, they cannot stabilize the active chlorine content. Finally, US Pat. No. 4,588,514 (Lever) discloses alkaline hypochlorite bleaches which contain amine oxides and small amounts of alkyl ether sulfates and soaps to adjust the viscosity. However, the preparations have a high hypochlorite content of 7% by weight. If the teaching is applied to modern bleaching agents with a low active chlorine content, neither sufficiently thickened nor storage-stable products are obtained. Furthermore, reference is made to the international patent application WO 93/08247 (Clorox), which relates to alkaline cleaners containing alkyl ether sulfates and terpene derivatives, and to the European patent application EP-A2 0651051 (Clorox), which discloses gel-like hypochlorite preparations, which contain a temporary thickener system consisting of soap, amine oxide or betaine and terpene derivatives.

The object of the invention was therefore to provide new aqueous bleaching agents and disinfectants which are characterized by a sufficiently high and stable viscosity at a low active chlorine content. Finally, an additional task was to develop thickeners for hypochlorite bleaches, which can take on further tasks in the formulations.

Description of the invention

The invention relates to bleaching and disinfecting agents containing - based on the agents -

a) 1 to 6% by weight of alkali metal hypochlorites,

(b) 0.5 to 5% by weight of alkyl ether sulfates and / or amine oxides,

(c) 0.5 to 2% by weight of alkali metal hydroxides,

(d) 0.5 to 3% by weight of electrolyte salts,

(e) 0.01 to 1% by weight of tetrahydromyrcenol and

(f) 0 to 4% by weight of fatty acid salts,

with the proviso that the amounts given with water and, if appropriate, further auxiliaries and additives are 100% by weight.

Surprisingly, it was found that bleaching agents and disinfectants of the specified additives composition are not only stable to chlorine, but also have a sufficiently high and constant viscosity due to the addition of tetrahydromyrcenol. The invention includes the knowledge that the tetrahydromyrcenol not only has a thickening effect, but also acts as an active chlorine-stable fragrance, which can lead to a simplification of the formulation and thus to an economic advantage, since other, usually significantly more expensive perfumes do not have to be worked in additionally.

Alkali metal hypochlorites

Alkali metal hypochlorites are to be understood as meaning lithium, potassium and in particular sodium hypochlorite. The hypochlorites can preferably be used in amounts of 2 to 4% by weight, based on the.

Alkyl ether sulfates

Alkyl ether sulfates are known anionic surfactants which are obtained by sulfation of nonionic surfactants of the alkylpolyglycol ether type and subsequent neutralization. The alkyl ether sulfates which are suitable for the purposes of the agents according to the invention follow the formula (I)

R ¹ 0- (CH ₂ CH2θ) nS0 ₃ X (I)

in which R ^{1 represents} an alkyl radical having 12 to 18 carbon atoms, n represents numbers 2 to 5 and X represents sodium or potassium. Typical examples are the sodium salts of sulfates of the Ci2 / i4-coconut alcohol-2, - 2,3- and -3-EO adduct. The alkyl ether sulfates can have a conventional or narrow homolog distribution. The alkyl ether sulfates are preferably used in amounts of 2 to 4% by weight, based on the composition.

Amine oxides

Amine oxides are also known substances, which are occasionally attributed to the cationic, but usually the nonionic surfactants. They are prepared from tertiary fatty amines, which usually have either one long and two short or two long and one short alkyl radical, and are oxidized in the presence of hydrogen peroxide. The amine oxides which are suitable for the purposes of the invention follow the formula (II) R3

IR ² -N-> 0 (II)

IR ⁴

in which R ^{2 represents} a linear or branched alkyl radical having 12 to 18 carbon atoms and R ³ and R ⁴ independently of one another R ² or an optionally hydroxyl-substituted alkyl radical having 1 to 4 carbon atoms. Amine oxides of the formula (II) are preferably used, in which R ² and R ^{3 are} C12 / 14 or C ₂ / i8 cocoalkyl radicals and R ^{4 is} a methyl or a hydroxyethyl radical. Also preferred are amine oxides of the formula (II) in which R ^{2 is} a C12 / 14 or C12 / 18 cocoalkyl radical and R ³ and R ^{4 have} the meaning of a methyl or hydroxyethyl radical. The amine oxides are preferably used in amounts of 1.5 to 3% by weight, based on the composition.

Alkali metal hydroxides

Suitable alkali metal hydroxides are potassium hydroxide and in particular sodium hydroxide, which are preferably used in amounts of 1.5 to 2% by weight, based on the composition, and serve to bring the pH of the composition to an optimal value of 12.5 to set 14.

Electrolyte salts

Typical examples of suitable electrolyte salts are the alkali and alkaline earth metal carbonates, chlorides, silicates, phosphates and phosphonates and mixtures thereof. Sodium or potassium carbonate or chloride are preferably used, which not only bring about the desired buffering of the preparation, but also additionally perform a sequestration of metal, in particular heavy metal, ions. An additional advantage is their low price and ease of incorporation. The electrolyte salts are preferably used in amounts of 1 to 2% by weight, based on the composition.

Tetrahydromyrcenol

Tetrahydromyrcenol follows the formula (IV). The terpene is obtained by hydrogenating myrcenol, which is a precursor to the production of geraniol and citronellol. (IV)

The preferred amounts are 0.1 to 0.5% by weight, based on the

Fatty acid salts

The agents according to the invention may contain fatty acid salts of the formula (III) as further constituents,

R5CO-OX (III)

in which R ⁵ CO is an acyl radical having 12 to 22 carbon atoms and X is an alkali metal. Typical examples are the sodium and / or potassium salts of lauric acid, myristic acid, palmitic acid, palmoleic acid, stearic acid, isostearic acid, oleic acid, elaidic acid, petroselinic acid, linoleic acid, linolenic acid, elaeostearic acid, arachic acid, gadoleic acid, behenic acid and technical mixtures as they occur in the pressure splitting of technical fats and oils. Salts of technical coconut or tallow fatty acids are preferably used. Since the recipes according to the invention are strongly alkaline, the fatty acids which are neutralized in situ when they are introduced into the mixture can also be used instead of the salts. The fatty acid salts are preferably used in amounts of 0.5 to 2% by weight, based on the composition.

Industrial applicability

Immediately after production, the agents according to the invention have a viscosity above 500 mPas - measured at 20 ° C. in a Brookfield viscometer -, are stable in storage, resistant to chlorine consumption and are distinguished by excellent dispersibility for dye pigments. Another object of the invention relates to the use of tetrahydromyrcenol as a chlorine-stable fragrance and thickener in hypochlorite-containing bleaching and disinfecting agents.

Examples of auxiliaries and additives which the preparations may further contain are further chlorine-stable surfactants or hydrotropes, such as alkyl sulfates, alkyl sulfonates, alkyl benzenesulfonates, xylene sulfonates, sarcosinates, taurides, isethionates, sulfosuccinates, betaines, sugar esters, fatty alcohol polyglycol ethers and alkyl oligoglycosides. The sum of these additional surfactants preferably makes up at most 10% by weight of the total amount of surfactants in the formulation. The use of alkyl sulfates in amounts of 0.5 to 3% by weight is particularly preferred. In addition, the agents can contain further active chlorine-stable fragrances, optical brighteners, dyes and pigments in a total amount of 0.01 to 0.5% by weight, based on the agents. The fragrances known to be active chlorine-resistant include, for example, monocyclic and bicyclic monoterpene alcohols and their esters with acetic or propionic acid (for example isoborneal, dihydroterpene oil, isobornyl acetate, dihydroterpenyl acetate). The optical brighteners can be, for example, the potassium salt of 4,4'-bis (1, 2,3-triazolyl) - (2 -) - stilbin-2,2-sulfonic acid, which is sold under the Phorwite® BHC brand 766 is distributed. Possible color pigments include green chlorophthalocyanines (Pigmosol® Green, Hostaphine® Green) or yellow Solar Yellow® BG 300 (Sandoz). Polyacrylates, amine oxide phosphonic acids and lignin sulfonates and mixtures thereof can also be present as sequestering agents in amounts of 0.1 to 2 and preferably 0.5 to 1% by weight, based on the agent. The agents according to the invention are produced by stirring. If necessary, the product obtained can be decanted or filtered to remove foreign bodies and / or agglomerates.

Examples

The viscosity was determined at 20 ° C. using a Brookfield viscometer (model RVT, spindle No. 1 or No. 2, 200 rpm). To determine the chlorine stability, the test mixtures were stored in a colorless plastic bottle under the influence of daylight and the active chlorine content was determined. Formulations 1 to 8 are according to the invention, formulations V1 to V3 are used for comparison. The results are summarized in Table 1 (quantitative data as% by weight)

Table 1

Viscosity, storage stability, chlorine consumption and cleaning ability

ö ponefi egg? 1 2 3 4 S δ 7 »: ¥ 1 ¥ 2. V3

Sodium hypochlorite 2.0 2.0 2.0 2.0 2.0 2.0 4.0 2.0 2.0 2.0 2.0

Coconut fatty alcohol + 2EO sulfate- 2.6 2.0 2.0 2.0 2.0 2.0 2.0 - 2.0 2.0 2.0 sodium salt

Dimethyl cocoalkylamine oxide -. - - - -. 2.0. . .

Sodium hydroxide 0.9 0.9 0.9 0.9 0.4 0.4 0.9 0.9 0.4 0.4 0.9

Sodium carbonate 1.0 1.0 1.0 1.5 1.5 2.0 1.5 1.0 1.5 2.0 1.0

Sodium chloride - - 0.5 - - - - - - - -

Tetrahydromyrcenol 0.05 0.1 0.1 0.1 0.1 0.1 0.1 0.1 - - -

Lauric acid sodium salt - - - - - 0.1 - - - -.

Sodium silicate - - - - - 0.5 -. . . -

Amine oxide phosphonic acid - - - 0.05 - - - -. - -

Polyacrylate - - - - 0.05 - - -. . -

Water ad 100

Viscosity [mPas]

- after 24 hours 250 620 590 585 520 610 600 600 15 25 25

- after 2 weeks 220 610 570 545 485 590 580 580 10 10 10

- after 4 weeks 190 580 550 510 415 550 550 520 10 10 10

Active chlorine content [% -rel]

- immediately 100 100 100 100 100 100 100 100 100 100 100

- after 4 weeks 81 83 85 85 85 86 85 82 79 78 76

Claims

claims

1. Bleaching and disinfecting agents containing - based on the agents -

(a) 1 to 6% by weight of alkali metal hypochlorites,

(b) 0.5 to 5% by weight of alkyl ether sulfates and / or amine oxides,

(c) 0.5 to 2% by weight of alkali metal hydroxides,

(d) 0.5 to 3% by weight of electrolyte salts,

(e) 0.01 to 1% by weight of tetrahydromyrcenol and

(f) 0 to 4% by weight of fatty acid salts

with the proviso that the amounts given with water and, if appropriate, other auxiliaries and additives are 100% by weight.

2. Composition according to claim 1, characterized in that they contain sodium hypochlorite.

3. Composition according to claims 1 and 2, characterized in that they contain alkyl ether sulfates of the formula (I),

RiO- (CH ₂ CH2θ) nS0 ₃ X (I)

in which R ^{1 represents} an alkyl radical having 12 to 18 carbon atoms, n represents numbers 2 to 5 and X represents sodium or potassium.

4. Composition according to claims 1 to 3, characterized in that they contain amine oxides of the formula (II),

R ³

I.

R -N-> 0 (II)

IR ⁴

in which R ^{2 represents} a linear or branched alkyl radical having 12 to 18 carbon atoms and R ³ and R ⁴ independently of one another R ² or an optionally hydroxyl-substituted alkyl radical having 1 to 4 carbon atoms.

5. Composition according to claims 1 to 4, characterized in that they contain sodium hydroxide.

6. Composition according to claims 1 to 5, characterized in that they contain electrolyte salts which are selected from the group formed by alkali and / or alkaline earth carbonates, chlorides, silicates, phosphates and phosphonates.

7. Compositions according to claims 1 to 6, characterized in that they contain fatty acid salts of the formula (IV),

R ⁶ CO-OX (III)

in which R ⁶ CO is an acyl radical having 12 to 22 carbon atoms and X is an alkali metal.

8. Composition according to claims 1 to 7, characterized in that they contain sequestering agents which are selected from the group consisting of polyacrylates, amine oxide phosphonic acids and lignin sulfonates.

9. Composition according to claims 1 to 8, characterized in that they have a viscosity immediately above the production above 500 mPas - measured at 20 ° C in a Brookfield viscometer.

10. Use of tetrahydromyrcenol as a chlorine-stable fragrance and thickener in hypochlorite-containing bleaching and disinfecting agents.