EP0335584B1 - Bleaching composition - Google Patents

Bleaching composition Download PDF

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Publication number
EP0335584B1
EP0335584B1 EP89302882A EP89302882A EP0335584B1 EP 0335584 B1 EP0335584 B1 EP 0335584B1 EP 89302882 A EP89302882 A EP 89302882A EP 89302882 A EP89302882 A EP 89302882A EP 0335584 B1 EP0335584 B1 EP 0335584B1
Authority
EP
European Patent Office
Prior art keywords
composition
bleaching
foam
agent
foaming
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Revoked
Application number
EP89302882A
Other languages
German (de)
French (fr)
Other versions
EP0335584A2 (en
EP0335584A3 (en
Inventor
Cornelius Bernard Donker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unilever PLC
Unilever NV
Original Assignee
Unilever PLC
Unilever NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Unilever PLC, Unilever NV filed Critical Unilever PLC
Publication of EP0335584A2 publication Critical patent/EP0335584A2/en
Publication of EP0335584A3 publication Critical patent/EP0335584A3/en
Application granted granted Critical
Publication of EP0335584B1 publication Critical patent/EP0335584B1/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/37—Polymers
    • C11D3/3703—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C11D3/373—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds containing silicones
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/0005—Other compounding ingredients characterised by their effect
    • C11D3/0026—Low foaming or foam regulating compositions
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/395—Bleaching agents
    • C11D3/3956—Liquid compositions

Definitions

  • the present invention relates to an aqueous bleaching composition suitable for laundry and general domestic bleaching and disinfecting purposes. More particularly, it relates to an aqueous bleaching composition which also contains a synthetic detergent which is soluble in the composition thereby to impart a foaming capacity to the composition.
  • the preferred bleaching agent is alkali metal hypochlorite.
  • Such an aqueous alkali metal hypochlorite composition comprising a foam-imparting synthetic detergent is known in the art, e.g. from British Patent Specification 886,084. This specification describes inter alia the use of betaine-type quaternary ammonium detergent surfactants in aqueous alkali metal hypochlorite compositions.
  • foam-imparting synthetic detergents are the trialkylamine oxides, containing one C12-C18 alkyl group and two C1-C3 alkyl groups.
  • compositions while having the required foaming characteristics, present a problem, however, in that, during manufacture and packing of the composition the foaming of the composition makes it difficult to fill the containers properly; the composition foams out of the bottle, resulting in messy bottles which are not filled with the proper filling weight.
  • the invention provides an aqueous bleaching composition alkali metal hypochlorite composition comprising a foaming synthetic detergent with a controlled foaming behaviour, characterised in that it has been obtained by the addition thereto of a foam-depressing agent which is not stable in the composition.
  • the invention provides a process for the production of an aqueous bleaching composition
  • an aqueous bleaching composition comprising an aqueous mixture of a bleaching agent and a foaming synthetic detergent, characterised by including a foam-depressing agent which is not stable in the mixture, packing the composition in containers while the foam-depressing agent remains effective, and optionally then storing the containers.
  • the invention provides a bleaching composition obtained by including a foam-depressing agent in an aqueous mixture of a bleaching agent and a foaming synthetic detergent, which foam-depressing agent is not stable therein, packing the composition in containers while the said foam-depressing agent remains effective, and optionally then storing the containers.
  • composition in the containers will change during storage. Initially it will be temporarily low-foaming or non-foaming, with a latent foaming property. As time passes the foam-depressing agent is replaced by products of its decomposition and the foaming property will appear.
  • the invention extends of course to containers with the bleaching composition therein.
  • a preferred feature made possible by this invention is that the containers are filled substantially full with the composition.
  • the foam-depressing agent must be unstable in the composition.
  • Foam-depressing agents which have been found very effective are silicones (more correctly polysiloxanes). These may be used in an amount which is at least 0.001% by weight of the composition. Amounts greater than 0.01% by weight will normally not be necessary, although amounts somewhat in excess of this may be used if desired, for instance up to 0.5% by weight of the composition.
  • Polysiloxanes which can be employed as antifoam agents have the structure: wherein R and R', which may be the same or different, are alkyl or aryl groups having from 1 to 6 carbon atoms; and x is an integer of at least 20.
  • the preferred polysiloxanes are polydimethylsiloxanes where both R and R' are methyl groups. Usually the molecular weight is from 500 to 200 000.
  • polydimethylsiloxanes examples include the "Silicone 200 Fluids", available from Dow Corning.
  • the composition will generally contain from 1 to 15% by weight of the bleaching agent.
  • the preferred bleaching agent is alkali metal hypochlorite, for example sodium hypochlorite.
  • Other bleaching agents may be used, for example hydrogen peroxide.
  • the time taken for the composition to regain its foaming properties will of course depend on the rate of reaction between the bleaching agent and the silicone. Thus, hydrogen peroxide would take somewhat longer than a like amount of hypochlorite to degrade the silicone but this merely necessitates some increase in the time for which the composition is stored after packing.
  • the synthetic detergents preferably used in this invention are amine oxides, more preferably trialkyl amine oxides in which one alkyl group has from 8 to 20 carbon atoms while the other two have from 1 to 4 carbon atoms.
  • An example is lauryl dimethyl amine oxide.
  • the amount of surfactant included in the composition typically lies in the range from 0.05 to 1.5% by weight of the composition. Amounts somewhat greater than 1.5% by weight may be used if desired, for instance up to 5% by weight.
  • composition usually contains free alkali to provide a desired alkaline pH.
  • Other additives can be included, such as perfumes and colouring agents.
  • compositions were assessed by shaking a quantity of each composition in accordance with a standardised procedure and then observing the height of foam generated.
  • the compositions were analysed for residual bleaching agent after a period of storage. These test results are included in the Table below.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Detergent Compositions (AREA)

Description

  • The present invention relates to an aqueous bleaching composition suitable for laundry and general domestic bleaching and disinfecting purposes. More particularly, it relates to an aqueous bleaching composition which also contains a synthetic detergent which is soluble in the composition thereby to impart a foaming capacity to the composition. The preferred bleaching agent is alkali metal hypochlorite.
  • Such an aqueous alkali metal hypochlorite composition comprising a foam-imparting synthetic detergent is known in the art, e.g. from British Patent Specification 886,084. This specification describes inter alia the use of betaine-type quaternary ammonium detergent surfactants in aqueous alkali metal hypochlorite compositions. Another suitable type of foam-imparting synthetic detergents are the trialkylamine oxides, containing one C₁₂-C₁₈ alkyl group and two C₁-C₃ alkyl groups.
  • Such compositions, while having the required foaming characteristics, present a problem, however, in that, during manufacture and packing of the composition the foaming of the composition makes it difficult to fill the containers properly; the composition foams out of the bottle, resulting in messy bottles which are not filled with the proper filling weight.
  • We have now found that this problem can be overcome by adding a suitable foam-depressing agent to the composition. We have found that if a foam-depressing agent is added which is not stable in the aqueous bleaching composition, the foam produced during manufacture and packing of the composition is significantly reduced. It may be reduced to an almost negligible level. However, the foaming capacity of the composition is restored upon storage of the packed composition owing to the instability of the foam-depressing agent in the composition, thus resulting in a foaming composition after storage thereof.
  • The features of this invention can be stated in several ways. In a first aspect the invention provides an aqueous bleaching composition alkali metal hypochlorite composition comprising a foaming synthetic detergent with a controlled foaming behaviour, characterised in that it has been obtained by the addition thereto of a foam-depressing agent which is not stable in the composition.
  • In a second aspect the invention provides a process for the production of an aqueous bleaching composition comprising an aqueous mixture of a bleaching agent and a foaming synthetic detergent, characterised by including a foam-depressing agent which is not stable in the mixture, packing the composition in containers while the foam-depressing agent remains effective, and optionally then storing the containers.
  • In another aspect the invention provides a bleaching composition obtained by including a foam-depressing agent in an aqueous mixture of a bleaching agent and a foaming synthetic detergent, which foam-depressing agent is not stable therein, packing the composition in containers while the said foam-depressing agent remains effective, and optionally then storing the containers.
  • The composition in the containers will change during storage. Initially it will be temporarily low-foaming or non-foaming, with a latent foaming property. As time passes the foam-depressing agent is replaced by products of its decomposition and the foaming property will appear.
  • The invention extends of course to containers with the bleaching composition therein. A preferred feature made possible by this invention is that the containers are filled substantially full with the composition.
  • The foam-depressing agent must be unstable in the composition. Foam-depressing agents which have been found very effective are silicones (more correctly polysiloxanes). These may be used in an amount which is at least 0.001% by weight of the composition. Amounts greater than 0.01% by weight will normally not be necessary, although amounts somewhat in excess of this may be used if desired, for instance up to 0.5% by weight of the composition.
  • Polysiloxanes which can be employed as antifoam agents have the structure:
    Figure imgb0001
    wherein R and R', which may be the same or different, are alkyl or aryl groups having from 1 to 6 carbon atoms; and x is an integer of at least 20.
  • The preferred polysiloxanes are polydimethylsiloxanes where both R and R' are methyl groups. Usually the molecular weight is from 500 to 200 000.
  • Examples of suitable commercially available polydimethylsiloxanes are the "Silicone 200 Fluids", available from Dow Corning.
  • The composition will generally contain from 1 to 15% by weight of the bleaching agent. As mentioned, the preferred bleaching agent is alkali metal hypochlorite, for example sodium hypochlorite. Other bleaching agents may be used, for example hydrogen peroxide. The time taken for the composition to regain its foaming properties will of course depend on the rate of reaction between the bleaching agent and the silicone. Thus, hydrogen peroxide would take somewhat longer than a like amount of hypochlorite to degrade the silicone but this merely necessitates some increase in the time for which the composition is stored after packing.
  • Various foam-imparting detergents are available. Synthetic detergents are described in "Surface Active Agents" by Schwartz and Perry (Interscience 1949) and Volume II by Schwartz, Perry and Berch (Interscience 1958).
  • The synthetic detergents preferably used in this invention are amine oxides, more preferably trialkyl amine oxides in which one alkyl group has from 8 to 20 carbon atoms while the other two have from 1 to 4 carbon atoms. An example is lauryl dimethyl amine oxide.
  • The amount of surfactant included in the composition typically lies in the range from 0.05 to 1.5% by weight of the composition. Amounts somewhat greater than 1.5% by weight may be used if desired, for instance up to 5% by weight.
  • Usually the composition also contains free alkali to provide a desired alkaline pH. Other additives can be included, such as perfumes and colouring agents.
  • The following Example illustrates the invention.
    • Example
  • Four bleaching compositions as set out in the Table below were prepared. The proportions stated in this Table are percentages by weight based on the whole composition as prepared.
  • The foaming characteristics of the compositions were assessed by shaking a quantity of each composition in accordance with a standardised procedure and then observing the height of foam generated. The compositions were analysed for residual bleaching agent after a period of storage. These test results are included in the Table below. Table
    sodium hypochlorite 5 5 5 5
    lauryl dimethyl amine oxide 0.4 0.4 0.4 0.4
    sodium hydroxide 0.5 0.5 0.5 0.5
    perfume 0.06 0.06 0.06 0.06
    silicone oil 0.01 0.005 0.001 -
    water q.s q.s q.s q.s
    Foam height (initial) 0 10 70 200
    Foam height (after 1 week storage at room temperature) 75 70 85 125
    Foam height (after 2 weeks storage at room temperature) 150 175 200 150
    % sodium hypochlorite left after 8 weeks storage at 37°C 68 68 68 70

    This example shows that the initial foaming is significantly reduced, but that the foaming characteristics reappear after 1-2 weeks storage, while there is no substantial loss of bleaching agent.

Claims (9)

  1. A bleaching composition obtained by including a foam-depressing agent in an aqueous mixture of a bleaching agent and a foaming synthetic detergent, which foam-depressing agent is not stable therein, packing the composition in containers and optionally then storing the containers.
  2. A bleaching composition according to claim 1 wherein the bleaching agent is an alkali metal hypochlorite.
  3. A bleaching composition according to any one of the preceding claims wherein the foam-depressing agent is a silicone.
  4. A bleaching composition according to any one of the preceding claims wherein the synthetic detergent is a trialkyl amine oxide.
  5. A bleaching composition according to any one of the preceding claims containing from 1% to 15% by weight of the bleaching agent, 0.05 to 1.5% by weight of the synthetic detergent and at least 0.001% of the foam-depressing agent.
  6. A container having therein bleaching composition according to any one of the preceding claims.
  7. A process for the production of an aqueous bleaching composition comprising an aqueous mixture of a bleaching agent and a foaming synthetic detergent, characterised by including a foam-depressing agent which is not stable in the mixture, and packing the composition in containers while foaming is inhibited by the presence of the foam-depressing agent.
  8. A process according to claim 7 followed by storing the containers with the composition therein.
  9. A container having therein bleaching composition produced and packed by the process of claim 7 or claim 8.
EP89302882A 1988-03-31 1989-03-22 Bleaching composition Revoked EP0335584B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB888807752A GB8807752D0 (en) 1988-03-31 1988-03-31 Bleaching composition
GB8807752 1988-03-31

Publications (3)

Publication Number Publication Date
EP0335584A2 EP0335584A2 (en) 1989-10-04
EP0335584A3 EP0335584A3 (en) 1990-11-22
EP0335584B1 true EP0335584B1 (en) 1994-11-30

Family

ID=10634470

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89302882A Revoked EP0335584B1 (en) 1988-03-31 1989-03-22 Bleaching composition

Country Status (9)

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EP (1) EP0335584B1 (en)
JP (1) JPH01289900A (en)
AU (1) AU616951B2 (en)
BR (1) BR8901474A (en)
DE (1) DE68919500T2 (en)
ES (1) ES2065371T3 (en)
GB (1) GB8807752D0 (en)
TR (1) TR24043A (en)
ZA (1) ZA892355B (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9307804D0 (en) * 1993-04-15 1993-06-02 Unilever Plc Hygienic spray cleaner
US6537958B1 (en) 1999-11-10 2003-03-25 The Procter & Gamble Company Bleaching compositions
US20150099010A1 (en) 2013-10-07 2015-04-09 Reoxcyn Discoveries Group, Inc Redox signaling gel formulation
US10485827B2 (en) 2016-01-19 2019-11-26 Rdg Holdings, Inc. Topical eye serum compositions, methods or preparing, and methods of use
US11857674B2 (en) 2016-05-18 2024-01-02 Reoxcyn, Llc Lubricant formulations
US9474768B1 (en) 2016-05-18 2016-10-25 Reoxcyn Discoveries Group, Inc. Lubricant formulations
US9833471B1 (en) * 2016-09-15 2017-12-05 Reoxcyn Discoveries Group, Inc. Hypochlorous acid-based hand sanitizer

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE755338A (en) * 1969-08-29 1971-02-26 Unilever Nv BLEACHING COMPOSITIONS
EP0110544A1 (en) * 1982-11-02 1984-06-13 Imperial Chemical Industries Plc Bleaching compositions
JPS6295365A (en) * 1985-10-21 1987-05-01 Mitsubishi Yuka Fine Chem Co Ltd Washing solution of printing ink
US4752409A (en) * 1985-06-14 1988-06-21 Colgate-Palmolive Company Thixotropic clay aqueous suspensions
JP2843027B2 (en) * 1985-06-28 1999-01-06 花王株式会社 Mold remover composition
GB8608292D0 (en) * 1986-04-04 1986-05-08 Unilever Plc Thickened liquid bleaching composition
JPH0672239B2 (en) * 1986-08-21 1994-09-14 タイホ−工業株式会社 Polishing cleaning method
NZ226174A (en) * 1987-09-23 1991-03-26 Colgate Palmolive Co Aqueous cleaning composition; no- or low-phosphorus built mixture

Also Published As

Publication number Publication date
EP0335584A2 (en) 1989-10-04
ES2065371T3 (en) 1995-02-16
DE68919500T2 (en) 1995-05-04
JPH01289900A (en) 1989-11-21
DE68919500D1 (en) 1995-01-12
AU616951B2 (en) 1991-11-14
AU3223189A (en) 1989-10-05
BR8901474A (en) 1989-11-14
TR24043A (en) 1991-02-07
GB8807752D0 (en) 1988-05-05
EP0335584A3 (en) 1990-11-22
ZA892355B (en) 1990-12-28

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