Patent Application
20190376006
The present invention relates to a method of delivering benefit agents to fabrics in the laundry process. In particular by way of a liquid ancillary composition for use in addition to a laundry liquid.
Consumers of laundry products constantly seek improvements in their products. It is desired for more fragrance, more softening, more cleaning etc. each consumer having their own desires.
Products currently on the market go some way towards delivering benefits to the consumer
WO 2014/079621 discloses a laundry detergent composition comprising: surfactant, fabric softening silicone and cationic polysaccharide polymer. The invention is directed to a softening in the wash laundry composition.
However these are not an ideal solution, there remains a need enhance the benefits delivered to fabrics during the laundry process.
It has surprisingly been found that, if the desired benefit agent is delivered into the washing machine in a liquid ancillary composition and not in a traditional laundry liquid, then the benefit provided to the fabrics is enhanced.
In a first aspect of the present invention is provided a method of delivering a benefit agent to a fabric during the laundry process, wherein a liquid ancillary laundry composition comprising:
is added to the laundry process in addition to a laundry liquid.
The term ‘laundry liquid’ is used to refer to traditional liquids used in the laundry process, particularly liquid laundry detergents and liquid laundry fabric conditioners/softener.
The term ‘liquid ancillary composition’ is used to refer to a specific format of laundry product. This is a liquid product which is used in addition to the laundry detergent and/or the fabric conditioner to provide an additional or improved benefit to the materials in the wash or rinse cycle. This is a low surfactant product. Liquid ancillary composition may also be referred to as a serum.
Throughout this specification density is measured by weighing a known volume of sample using a ‘Sheen’ density cup with lid on a 4 figure balance.
Throughout this specification density is measured by weighing a known volume of sample using a ‘Sheen’ density cup with lid on a 4 figure balance.
Throughout this specification viscosity measurements were carried out at 25° C., using a 4cm diameter 2° cone and plate geometry on a DHR-2 rheometer ex. TA instruments.
In detail, all measurements were conducted using a TA-Instruments DHR-2 rheometer with a 4 cm diameter 2 degree angle cone and plate measuring system. The lower Peltier plate was used to control the temperature of the measurement to 25° C. The measurement protocol was a ‘flow curve’ where the applied shear stress is varied logarithmically from 0.01 Pa to 400 Pa with 10 measurement points per decade of stress. At each stress the shear strain rate is measured over the last 5 seconds of the 10 second period over which the stress is applied with the viscosity at that stress being calculated as the quotient of the shear stress and shear rate.
For those systems which exhibit a low shear viscosity plateau over large shear stress ranges, to at least 1 Pa, the characteristic viscosity is taken as being the viscosity at a shear stress of 0.3 Pa. For those systems where the viscosity response is shear thinning from low shear stress the characteristic viscosity is taken as being the viscosity at a shear rate of 21 s-1.
Method of Delivery
The method of the present invention is a method of delivering a benefit agent to the fabric during the laundry process. The liquid ancillary composition is used in addition to a laundry liquid. The liquid ancillary composition delivers benefit additional or improved benefits over those of a laundry liquid.
Preferably the liquid ancillary composition is added to the laundry process with a laundry liquid. By this is meant that the liquid ancillary composition is add to the laundry process at the same time as a laundry liquid. This may be at the same time as the laundry detergent or at the same time as the fabric conditioner.
The liquid ancillary composition may be added to the drawer of a washing machine or the drum of a washing machine. By drawer it is meant any one of the compartments in the drawer of a washing machine. When added to the drum, this may be direct addition into the drum or via a dosing ball. A dosing ball is preferred. By dosing ball is meant any form of container which would usually hold a laundry detergent composition and be placed directly in a washing machine.
Preferably a laundry liquid is poured into a washing machine drawer or a dosing ball, and then the liquid ancillary composition is poured on top of the laundry liquid in the drawer or dosing ball.
It has been found that adding the liquid ancillary laundry composition to the drum or the drawer both provide improved benefits from a benefit agent. Preferably the liquid ancillary composition is added to the drum for best results.
Preferably the liquid ancillary composition is added to the laundry process in a volume of 2-50 ml, more preferably a volume of ml 2-30 ml, most preferably 2-20 ml.
Physical Properties of the Liquid Ancillary Composition
Preferably, the liquid ancillary laundry composition floats on a, laundry liquid with which it is used. By float it is meant that the liquid ancillary composition will remain at the surface of the laundry liquid for a period of at least 5 minutes, preferably 10 minutes and most preferably at least 15 minutes. Floating provides the benefit the laundry liquid carries the liquid ancillary composition into the laundry process.
To enable the liquid ancillary composition to float, it is not essential that it is less dense than the laundry liquid with which it is being used, however it is preferred that the liquid ancillary composition is less dense than the laundry liquid with which it is used. This density provides the benefit the laundry liquid carries the liquid ancillary composition into the laundry process.
The viscosity of the laundry composition is preferably 400-15000 Pa.s. This viscosity provides the benefit the laundry liquid carries the liquid ancillary composition into the laundry process.
Preferably the viscosity of the laundry serum composition is greater than the viscosity of a laundry liquid with which it is used, more preferably 300 Pa.s, most preferably 500 Pa.s greater than a laundry liquid with which it is used. The higher viscosity prevents mixing of the laundry serum composition and laundry liquid and provides the benefit that the entire serum composition is carried into the wash or rinse with the laundry liquid.
Benefit Agent
The present invention is concerned with a method of delivering a liquid ancillary composition comprising a benefit agent. Benefit agents are materials which provide some form of benefit to the fabric. This benefit is normally a conceivable benefit which the consumers desire, for example effecting the feel, appearance, or perception of a fabric.
Non-limiting examples of suitable benefit agents include: lubricants (including silicones), antifoams, free perfumes and fragrances, encapsulated perfumes and fragrances, insect repellents, whiteness agents (eg shading or hueing dyes and/or fluorescers), preservatives (e.g. bactericides), enzymes (eg protease, lipases, cellulases, pectate lyase), dye transfer inhibitors, pH buffering agents, perfume carriers, anti-bacterial agent, fibre adhesives (eg starch, Polyvinyl acetate), elastomers, anti-microbial agents, anti-redeposition agents, soil-release agents, softening agents, polyelectrolytes, anti-shrinking agents, anti-wrinkle agents, anti-oxidants, dyes, colorants, shade enhancers, fluorescent agents, sunscreens, anti-corrosion agents, anti-static agents, sequestrants (preferably HEDP, an abbreviation for Etidronic acid or 1-hydroxyethane 1,1-diphosphonic acid), colour preservatives, fungicides and ironing aids.
Preferred benefit agents are: lubricants (including silicones), fibre adhesives (eg starch, Polyvinyl acetate), elastomers, free perfumes and fragrances, encapsulated perfumes and fragrances and or perfume carriers, insect repellents, whiteness agents (eg shading or hueing dyes and/or fluorescers), enzymes (eg protease, lipases, cellulases, pectate lyase), dye transfer inhibitors, soil-release agents, anti-shrinking agents, anti-wrinkle agents, dyes (including colorants and/or shade enhancers), sunscreens (including UV filters), anti-static agents, sequestrants (preferably HEDP, an abbreviation for Etidronic acid or 1-hydroxyethane 1,1-diphosphonic acid) or polyelectrolytes.
Particularly preferred benefit agents include: lubricants, free perfumes and encapsulated perfumes. Most preferably silicones, free perfumes and encapsulated perfumes.
Lubricants:
Lubricants may be silicone based lubricants or non-silicone based lubricants.
Examples of non-silicone based lubricants include clays, waxes, polyolefins, sugar polyesters, synthetic and natural oils.
For the purposes of this invention, lubricants do not include fabric softening quaternary ammonium compounds.
Preferably the lubricant is a silicone based lubricant. Silicones and their chemistry are described in, for example in The Encyclopaedia of Polymer Science, volume 11, p765.
Silicones suitable for the present invention are fabric softening silicones. Non-limiting examples of such silicones include: non-functionalised silicones such as polydialkylsiloxanes, particularly polydimethylsiloxane (PDMS), alkyl (or alkoxy) functionalised silicones, and functionalised silicones or copolymers with one or more different types of functional groups such as amino, phenyl, polyether, acrylate, siliconhydride, carboxy acid, phosphate, betaine, quarternized nitrogen and mixtures thereof.
The molecular weight of the silicone is preferably from 1,000 to 500,000, more preferably from 2,000 to 250,000 even more preferably from 5,000 to 100,000.
The silicone composition of the current invention may be in the form of an emulsion or as a silicone fluid. In a preferred embodiment the silicone is in the form of a silicone emulsion.
When the silicone is in an emulsion, the particle size can be in the range from about 1 nm to 100 microns and preferably from about 10 nm to about 10 microns including microemulsions (<150 nm), standard emulsions (about 200 nm to about 500 nm) and macroemulsions (about 1 micron to about 20 microns).
The fabric softening silicones may be an emulsion or a fluid, preferably an emulsion.
Preferred non-functionalised silicones are polydialkylsiloxanes, most preferred non-functionalised silicones are polydimethylsiloxane (PDMS).
Preferred functionalised silicones are an anionic functionalised silicone. Examples of fabric softening anionic silicones suitable for the current invention include silicones containing the following functionalities; carboxylic, sulphate, sulphonic, phosphate and/or phosphonate functionality.
Preferably the anionic silicones of the current invention comprise silicones having a functionality selected from; carboxylic, sulphate, sulphonic, phosphate and/or phosphonate functionality or mixtures thereof. More preferably the anionic silicone of the present invention comprises carboxyl functionalised silicones. Most preferably the anionic silicone of the current invention is a carboxyl silicone.
For the purposes of the current invention, the anionic silicone may be in the form of the acid or the anion. For example for a carboxyl functionalised silicone, may be present as a carboxylic acid or carboxylate anion.
An example of a commercially available anionic functional material are: X22-3701E from Shin Etsu and Pecosil PS-100 from Pheonix Chemical.
Preferably the anionic silicone has an anionic group content of at least 1 mol %, preferably at least 2 mol %.
The anionic group(s) on the anionic silicones of the present invention are preferably located in pendent positions on the silicone i.e. the composition comprises anionic silicones wherein the anionic group is located in a position other than at the end of the silicone chain. The terms ‘terminal position’ and ‘at the end of the silicone chain’ are used to indicate the terminus of the silicone chain.
When the silicones are linear in nature, there are two ends to the silicone chain. In this case the anionic silicone preferably contains no anionic groups located on a terminal position of the silicone.
When the silicones are branched in nature, the terminal position is deemed to be the two ends of the longest linear silicone chain. Preferably no anionic functionality is not located on the terminus of the longest linear silicone chain.
Preferred anionic silicones are those that comprise the anionic group at a mid-chain position on the silicone. Preferably the anionic group(s) of the anionic silicone are located at least five Si atoms from a terminal position on the silicone. Preferably the anionic groups are distributed randomly along the silicone chain.
Most preferably the silicone of the present invention is selected from polydimethylsiloxane (PDMS) and carboxy functionalised silicones, preferred carboxy silicones are described above.
When a silicone is present, preferably the liquid ancillary laundry compositions comprises silicone at a level of 1 to 60 w.t % of the formulation, preferably 2 to 30 w.t. % of the formulation, more preferably 2.5 to 20 w.t. % of the formulation.
Perfumes:
The liquid ancillary compositions of the present invention preferably comprises a perfume composition. Perfume may be provided either as a free oil and/or in a microcapsule.
The liquid ancillary composition of the present invention may comprise one or more perfume compositions. The perfume compositions may be in the form of a mixture or free perfumes compositions, a mixture of encapsulated perfume compositions or a mixture of encapsulated and free oil perfume compositions.
Useful perfume components may include materials of both natural and synthetic origin. They include single compounds and mixtures. Specific examples of such components may be found in the current literature, e.g., in Fenaroli's Handbook of Flavor Ingredients, 1975, CRC Press; Synthetic Food Adjuncts, 1947 by M. B. Jacobs, edited by Van Nostrand; or Perfume and Flavor Chemicals by S. Arctander 1969, Montclair, N.J. (USA). These substances are well known to the person skilled in the art of perfuming, flavouring, and/or aromatizing consumer products.
Free oil perfumes and fragrances may be added to the liquid ancillary composition. These may be to scent the liquid ancillary composition, to provide scent in the washing process or to provide scent to the textiles after the wash.
Particularly preferred perfume components are blooming perfume components and substantive perfume components. Blooming perfume components are defined by a boiling point less than 250° C. and a LogP greater than 2.5. Substantive perfume components are defined by a boiling point greater than 250° C. and a LogP greater than 2.5. Preferably a perfume composition will comprise a mixture of blooming and substantive perfume components. The perfume composition may comprise other perfume components.
It is commonplace for a plurality of perfume components to be present in a free oil perfume composition. In the compositions for use in the present invention it is envisaged that there will be three or more, preferably four or more, more preferably five or more, most preferably six or more different perfume components. An upper limit of 300 perfume ingredients may be applied.
Free perfume may preferably be present in an amount from 0.01 to 20% by weight, more preferably from 0.05 to 10% by weight, even more preferably from 0.1 to 5.0%, most preferably from 0.15 to 5.0% by weight, based on the total weight of the composition.
When perfume components are in a microcapsule, suitable encapsulating material, may comprise, but are not limited to; aminoplasts, proteins, polyurethanes, polyacrylates, polymethacrylates, polysaccharides, polyamides, polyolefins, gums, silicones, lipids, modified cellulose, polyphosphate, polystyrene, polyesters or combinations thereof.
Perfume components contained in a microcapsule may comprise odiferous materials and/or pro-fragrance materials.
Particularly preferred perfume components contained in a microcapsule are blooming perfume components and substantive perfume components. Blooming perfume components are defined by a boiling point less than 250° C. and a LogP greater than 2.5. Substantive perfume components are defined by a boiling point greater than 250° C. and a LogP greater than 2.5. Preferably a perfume composition will comprise a mixture of blooming and substantive perfume components. The perfume composition may comprise other perfume components.
It is commonplace for a plurality of perfume components to be present in a microcapsule. In the compositions for use in the present invention it is envisaged that there will be three or more, preferably four or more, more preferably five or more, most preferably six or more different perfume components in a microcapsule. An upper limit of 300 perfume ingredients may be applied.
Encapsulated perfume may preferably be present in an amount from 0.01 to 20% by weight, more preferably from 0.05 to 10% by weight, even more preferably from 0.1 to 5.0%, most preferably from 0.15 to 5.0% by weight, based on the total weight of the composition.
The liquid ancillary composition may comprise one benefit agents or a combination of various different benefit agents.
The liquid ancillary composition comprises at least 2 w.t. % benefit agents, preferably 2 w.t. % to 60 w.t. % more preferably, 2.5 to 45 w.t. %, most preferably, 4 w.t. % to 40 w.t. % benefit agent. The w.t. % of benefit agent is the combined weight of all of the benefit agents in the liquid ancillary laundry composition.
If the liquid ancillary composition comprises a microcapsules, a structurant may be required, non-limiting examples of suitable structurants include: pectine, alginate, arabinogalactan, carageenan, gellan gum, xanthum gum, guar gum, acrylates/acrylic polymers, water-swellable clays, fumed silicas, acrylate/aminoacrylate copolymers, and mixtures thereof. Preferred dispersants herein include those selected from the group consisting of acrylate/acrylic polymers, gellan gum, fumed silicas, acrylate/aminoacrylate copolymers, water-swellable clays, and mixtures thereof. Preferably a structurant is selected from acrylate/acrylic polymers, gellan gum, fumed silicas, acrylate/aminoacrylate copolymers, water-swellable clays, and mixtures thereof.
When present, a structurant is preferably present in an amount of 0.001-10 w.t. % percent, preferably from 0.005-5 w.t. %, more preferably 0.01-1 w.t. %.
Surfactant
The liquid ancillary composition of the present invention is not a traditional laundry detergent or fabric conditioning composition. The present invention preferably comprises low levels or no surfactants. Any surfactant present is preferably for the purpose of emulsifying and not for detergency or softening.
The liquid ancillary composition of the present invention comprises less than 4 w.t. % surfactant, preferably less than 2 w.t. % surfactant, more preferably less than 1 w.t. % surfactant, even more preferably less than 0.85 w.t. % surfactant and most preferably less than 0.5 w.t. %. The composition can be completely free of non-emulsified surfactant (ie surfactant not-used to emulsify the droplet).
In other words, the compositions may comprise 0 to 4 w.t. % surfactant, preferably, the composition of the present invention comprises 0 to 2 w.t. % surfactant, more preferably, 0 to 1 w.t. % surfactant, even more preferably 0 to 0.85 w.t. % and most preferably 0 to 0.5 w.t. %. The composition can be completely free of non-emulsified surfactant (ie surfactant not-used to emulsify the droplet).
The term surfactant covers all categories of surfactant, including: anionic, cationic, non-ionic and zwitterion surfactants. Many surfactants are traditionally used in laundry compositions: laundry detergent compositions often comprise anionic and non-ionic surfactants whereas fabric conditioning compositions often comprise cationic surfactants.
The composition of the present invention is not a traditional laundry detergent or fabric conditioning composition. The present invention preferably comprises low levels or no surfactants. Any surfactant present is preferably for the purpose of emulsifying the silicone ant not for detergency or softening.
Cationic Polymer
The liquid ancillary laundry composition of the present invention preferably comprises a cationic polymer. This refers to polymers having an overall positive charge.
The cationic polymer may be naturally derived or synthetic. Examples of suitable cationic polymers include: acrylate polymers, cationic amino resins, cationic urea resins, and cationic polysaccharides, including: cationic celluloses, cationic guars and cationic starches.
The cationic polymer of the present invention may be categorised as a polysaccharide-based cationic polymer or non-polysaccharide based cationic polymers.
Polysaccharide-based cationic polymers:
Polysacchride based cationic polymers include cationic celluloses, cationic guars and cationic starches. Polysaccharides are polymers made up from monosaccharide monomers joined together by glycosidic bonds.
The cationic polysaccharide-based polymers present in the compositions of the invention have a modified polysaccharide backbone, modified in that additional chemical groups have been reacted with some of the free hydroxyl groups of the polysaccharide backbone to give an overall positive charge to the modified cellulosic monomer unit.
Non polysaccharide-based cationic polymers:
A non-polysaccharide-based cationic polymer is comprised of structural units, these structural units may be non-ionic, cationic, anionic or mixtures thereof. The polymer may comprise non-cationic structural units, but the polymer must have a net cationic charge.
The cationic polymer may consists of only one type of structural unit, i.e., the polymer is a homopolymer. The cationic polymer may consists of two types of structural units, i.e., the polymer is a copolymer. The cationic polymer may consists of three types of structural units, i.e., the polymer is a terpolymer. The cationic polymer may comprises two or more types of structural units. The structural units may be described as first structural units, second structural units, third structural units, etc. The structural units, or monomers, may be incorporated in the cationic polymer in a random format or in a block format.
The cationic polymer may comprise a nonionic structural units derived from monomers selected from: (meth)acrylamide, vinyl formamide, N,N-dialkyl acrylamide, N,N-dialkylmethacrylamide, C1-C12 alkyl acrylate, C1-C12 hydroxyalkyl acrylate, polyalkylene glyol acrylate, C1-C12 alkyl methacrylate, C1-C12 hydroxyalkyl methacrylate, polyalkylene glycol methacrylate, vinyl acetate, vinyl alcohol, vinyl formamide, vinyl acetamide, vinyl alkyl ether, vinyl pyridine, vinyl pyrrolidone, vinyl imidazole, vinyl caprolactam, and mixtures thereof.
The cationic polymer may comprise a cationic structural units derived from monomers selected from: N,N-dialkylaminoalkyl methacrylate, N,N-dialkylaminoalkyl acrylate, N,N-dialkylaminoalkyl acrylamide, N,N-dialkylaminoalkylmethacrylamide, methacylamidoalkyl trialkylammonium salts, acrylamidoalkylltrialkylamminium salts, vinylamine, vinylimine, vinyl imidazole, quaternized vinyl imidazole, diallyl dialkyl ammonium salts, and mixtures thereof.
Preferably, the cationic monomer is selected from: diallyl dimethyl ammonium salts (DADMAS), N,N-dimethyl aminoethyl acrylate, N,N-dimethyl aminoethyl methacrylate (DMAM), [2-(methacryloylamino)ethyl]tri-methylammonium salts, N,N-dimethylaminopropyl acrylamide (DMAPA), N,N-dimethylaminopropyl methacrylamide (DMAPMA), acrylamidopropyl trimethyl ammonium salts (APTAS), methacrylamidopropyl trimethylammonium salts (MAPTAS), quaternized vinylimidazole (QVi), and mixtures thereof.
The cationic polymer may comprise a anionic structural units derived from monomers selected from: acrylic acid (AA), methacrylic acid, maleic acid, vinyl sulfonic acid, styrene sulfonic acid, acrylamidopropylmethane sulfonic acid (AMPS) and their salts, and mixtures thereof.
Some cationic polymers disclosed herein will require stabilisers i.e. materials which will exhibit a yield stress in the liquid ancillary composition of the present invention. Such stabilisers may be selected from: thread like structuring systems for example hydrogenated castor oil or trihydroxystearin e.g. Thixcin ex. Elementis Specialties, crosslinked polyacrylic acid for example Carbopol ex. Lubrizol and gums for example carrageenan.
Preferably the cationic polymer is selected from; cationic polysaccharides and acrylate polymers. More preferably the cationic polymer is a cationic polysaccharide.
The molecular weight of the cationic polymer is preferably greater than 20 000 g/mol, more preferably greater than 25 000 g/mol. The molecular weight is preferably less than 2 000 000 g/mol, more preferably less than 1 000 000 g/mol.
Liquid ancillary compositions according to the current invention preferably comprise cationic polymer at a level of 0.25 to 10 w.t % of the formulation, preferably 0.35 to 7.5 w.t. % of the formulation, more preferably 0.5 to 5 w.t. % of the formulation.
Rheology Modifier
In some embodiments of the present invention, the liquid ancillary compositions of the present invention may comprise rheology modifiers. These may be inorganic or organic, polymeric or non polymeric. A preferred type of rheology modifiers are salts.
Other Ingredients
The products of the invention may contain pearlisers and/or opacifiers. It may further comprise other optional laundry ingredients.
Method of preparing the detergent:
Water and the hydrotropes were mixed together at ambient temperature (approx. 22° C.) for 2-3 minutes at a shear rate of 150 rpm using a Janke & Kunkel IKA RW20 overhead mixer. Salts and alkalis were then added and mixed for 5 minutes prior to addition of the surfactants and fatty acid. The mixture became exothermic and was allowed to cool to <30°. The cationic polymer was added as an aqueous solution, followed by the silicone emulsion (if present) and the remaining components.
Method of Producing Example Ancillary Laundry Composition:
Demineralised water was added to the silicone emulsion1 and mixed for 15 mins at 250rpm using a Janke & Kunkel IKA RW20 overhead mixer. The solid deposition polymer2 was added slowly over the top and mix for further 20 mins increasing the rotor speed to effect visible bulk mixing.
Comparison of Formulations:
A wash cycle was carried out using 6 (20 cm×20 cm) pieces of terry toweling and a polycotton ballast. The total wash load was 2.0 kg. The toweling was mixed with the ballast fabric in a random order before adding into a Miele front loading washing machine.
Detergent was added as follows:
Wash A: 100 g Laundry detergent with silicone, as in table 1
Wash 1: 100 g Laundry detergent without silicone and 10 g Liquid ancillary Composition, as in Table 1. The detergent was first poured into the detergent draw of the front loading washing machine, the silicone liquid ancillary composition was then poured on top of the detergent composition in the drawer.
The machine was programed to a standard 40° C. cotton cycle. The toweling swatches were line dried between wash cycles. 5 wash cycles were performed. The towels were measured for softness using a Phabrometer® ex. Nu Cybertek, Inc.
Despite having slightly lower levels of silicone and deposition polymer in Wash 1 with the inventive composition is significantly softer than the comparative example Wash A.
Drum vs. Draw Dosing
A comparison was made comparing softening when a detergent and liquid ancillary composition are dosed together in the drawer of a washing machine vs. dosing together in the drum of a washing machine.
Softening Test:
Sheets were prepared as above.
The wash cycles were run using
Softening was assessed as outlined above.
The silicone liquid ancillary composition dosed with the detergent in the drum provided even more superior softening compared to the liquid ancillary composition dosed in the detergent drawer.
| Number | Date | Country | Kind |
|---|---|---|---|
| 17155804.2 | Feb 2017 | EP | regional |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2018/051674 | 1/24/2018 | WO | 00 |
