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
  • C11D3/3746—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • C11D3/3769—(Co)polymerised monomers containing nitrogen, e.g. carbonamides, nitriles or amines
  • C11D3/3776—Heterocyclic compounds, e.g. lactam
• • 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
  • C11D3/0021—Dye-stain or dye-transfer inhibiting compositions

Definitions

• the present invention relates to a laundry detergent composition intended particularly but not exclusively for domestic laundering operations.
• One problem which may be encountered in laundry operations is that dye from one garment may become dissolved in the wash water and then deposit on one or more other garments causing discolourations thereof.
• the problem can be particularly acute if garments of a relatively dark or deep colour are washed together with light coloured (e.g. white) or mixed garments which can become significantly discoloured.
• PVP polyvinylpyrrolidone
• O-A-9218598 proposes a composition having colour care properties and containing a polyvinylpyrrolidone polymer having a molecular weight of 5,000 to 1,000,000, more preferably from 5,000 to 50,000, most preferably from 8,000 to 15,000.
• the composition also contains an alkaline cellulase.
• WO-A-9218597 discloses a laundry detergent composition containing polyvinylpyrrolidone having a molecular weight of 5,000 to 22,000. This formulation may also contain a cellulase.
• a laundry detergent composition comprising at least one surface active agent and a polyvinylpyrrolidone having a molecular weight of greater than 1,000,000.
• polyvinylpyrrolidone as used in the invention is determined by SEC/LALLS (Size Exclusion Chromatography/Low Angle Laser Light Scattering) using the method disclosed in Journal of Liquid. Chromatography, 10(6), 1127-1150(1987) (Senak et al).
• PVP having a weight average molecular weight greater than 1,000,000 is particularly effective for scavenging dye during washing and preventing its re-deposition on other garments in the same wash load.
• the polyvinylpyrrolidone has a molecular weight of at least 1,200,000, more preferably at least 1,500,000.
• the molecular weight of the PVP may, for example, be 1,500,000 to 4,000,000. More preferably the molecular weight of the PVP may be in the range 2,000,000 to 4,000,000, e.g. 2,400,000 to 3,400,000. A particularly preferred molecular weight is about 2,900,000.
• PVP polyvinyl VP
• K-120 molecular weight 2,540,000 to 3,220,000
• K-90 molecular weight 1,270,000 to 1,710,000
• the PVP will be present in the formulation in an amount of 0.01 to 2.0% by weight (e.g. 0.05 to 2.0% by weight).
• the other essential ingredient of the formulation of the invention is a surface active agent.
• the surfactant used is preferably an anionic and/or non-ionic surfactant. It is however also possible to use zwitterionic or amphoteric surface active agents.
• anionic surfactants are anionic surfactant acids. Examples include alkyl aryl sulphonic acids, fatty acid sulphonic acids, olefin sulphonic acids, fatty alcohol ether sulphuric acid, fatty methyl ester sulphonic acid, and alkane sulphonic acids.
• the surfactant acid is an alkyl aryl sulphonic or sulphuric acid containing an alkyl group with 9-20 carbon atoms and a sulphonic or sulphuric acid ester group (included in the term alkyl is the alkyl portion of the aryl groups), or a fatty acid sulphuric acid obtained by sulphating alcohols with an 8-18 carbon atom chain.
• alkyl is the alkyl portion of the aryl groups
• a fatty acid sulphuric acid obtained by sulphating alcohols with an 8-18 carbon atom chain Especially useful are linear straight chain alkyl benzene sulphonic acids in which the average number of carbon atoms in the alkyl group is 11 to 13.
• the amount of anionic surfactant is preferably in the range 1% to 40% (e.g. 5% to 40%) with values toward the lower end of this range being preferred.
• the preferred amount of anionic surfactant is 1% to 30% by weight, more especially 5% to 25% by weight (e.g. 7 to 25% by weight).
• non-ionic surfactant is included in the formulation due to their good detergency properties.
• Preferred non- ionics are water-soluble alcohol ethoxylates of HLB lower than 13.
• Such non-ionics are preferably C 12 -C ⁇ a linear primary alcohols with 3 to 30 moles of ethylene oxide per mole of alcohol.
• the amount of non-ionic surfactant present is preferably 1% to 15% (e.g. 1% to 10%) by weight.
• the detergent composition also incorporates a cellulase.
• the function of the cellulase in relation to garments containing cellulosic, e.g. cotton fibres, is to digest microfibrils which are generated on the fibres. This prevents pilling of the garment and reduces reflectance.
• the higher molecular weight PVP used in the invention i.e. molecular weight greater than 1,000,000
• cellulase in reducing reflectance of the fabric caused by fibrils generated by normal wear of the garment.
• cellulases which may be used are those exemplified in WO-A-9218598. Generally the amount of cellulase used will be in the range 0.05% to 4% (e.g. 1% to 4%) by weight of the composition.
• the formulation will generally also include a builder usually in an amount of 15% to 50% by weight.
• the preferred builders are phosphates, particularly sodium tripolyphosphate and ortho- and pyro- phosphates.
• An alkaline material may also be included, e.g. in an amount 15% to 35%, to provide performance benefits in the laundering process.
• the preferred alkaline material is sodium carbonate.
• Anti-Redeposition Agent 0.5-5% Sodium Carboxymethyl Cellulose
• the detergent formulation in accordance with the invention is in powder or granular form.
• a particularly suitable method of producing such a powder or granular formulation is as disclosed in EP-A-0 353 976 (Cussons)
• particulate solids to be incorporated in the composition are blended in a fluidisation process and then the liquids are sprayed onto the blend. This results in agglomeration of particles to form granules of various particle sizes ranging from 2 mm to less than 75 microns.
• formulations in accordance with the invention will be used in amounts sufficient to give up to 100 mg of PVP per litre of wash liquor, more preferably less than 40 mg 1 " .
• composition A (Invention)
• Composition B (Comparative)
• composition A but replacing PVP K-120 by PVP HP50 available from BASF. Accordim* to the manufactures literature, HP50 has a molecular weight of 40,000.
• Composition C (Comparative)
• Test fabric - 100% white cotton, scoured and bleach Water hardness - Tap water (30 ppm CaC0 3 )
• Results were measured on an ICS/Texacon Micromatch MM2000 reflectometer using Cielab L and b values (i.e. lightness and blueness). The results are shown in Table 1.
• compositions in accordance with the invention give rise to higher L values and lower b values than either of the comparative compositions. Therefore these results show that compositions in accordance with the invention, incorporating the higher molecular weight PVP, are more effective for preventing dye deposition than the comparative compositions, including those which incorporate a lower molecular weight PVP.
• the L value for each fabric was determined (after the aforementioned 2 washes) using an ICS/Texacon Micromatch MM2000 reflectometer.
• the fabrics were then washed 10 times using formulations 1-6.
• the washing was carried out in a Tergotometer at 40°C for 30 minutes using an agitator speed of 90 rpm.
• the amount of each detergent formulation used was 10 g l - 1 and the water had a hardness of 30 ppm CaC0 3 .
• a positive value of ⁇ L indicates that the black fabric is becoming lighter, i.e. the large positive value of - L the greyer the fabric is becoming. Conversely a negative value of ⁇ L indicates that the fabric is becoming darker. With the exception of formulation 6, the values of ⁇ L are positive showing that detergent formulations 1- 5 result in increasing greyness of the fabric. It was only for formulation 6 that a negative value of ⁇ L was obtained, showing that reflectance had been reduced.

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• 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)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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Cited By (12)

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Citations (3)

• 1993
  • 1993-08-27 GB GB939317803A patent/GB9317803D0/en active Pending
• 1994
  • 1994-08-24 PL PL30479094A patent/PL304790A1/xx unknown
  • 1994-08-30 CN CN 94193807 patent/CN1133058A/zh active Pending
  • 1994-08-30 AU AU75048/94A patent/AU7504894A/en not_active Abandoned
  • 1994-08-30 WO PCT/GB1994/001882 patent/WO1995006098A1/en active Application Filing

Patent Citations (3)

Non-Patent Citations (1)

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