EP3459872A1

EP3459872A1 - Consumer packaging with fabric treatment fluid

Info

Publication number: EP3459872A1
Application number: EP17192767.6A
Authority: EP
Inventors: designation of the inventor has not yet been filed The
Original assignee: Unilever PLC
Current assignee: Unilever PLC
Priority date: 2017-09-22
Filing date: 2017-09-22
Publication date: 2019-03-27
Also published as: CN209467444U

Abstract

A package (1) comprising a reservoir (3) for containing a high viscosity fabric treatment fluid, the reservoir comprising an internal surface, the internal surface comprising at least one recess (29, 31, 33, 35), wherein the or each recess is elongated, curved and follows continuous path spiraling relative to the longitudinal axis of the package and in that the path extends greater than 90 degrees measured as a rotation about the longitudinal axis of the package.

Description

The present invention relates to packaging for high viscosity fabric treatment fluids which are dispensed by pouring.
Whilst high viscosity liquids offer many advantages, one problem is that these liquids may cling to the inner surface of bottle so that liquid may remain inside preventing complete evacuation and use of all fluid. Consumers often tip the bottle fully to try to force full evacuation but this may not be successful as instead, the viscous liquid adheres to upper parts of the bottle. Complete evacuation is desirable to ensure consumer value for money and to avoid needless waste of chemicals.
Despite the prior art there remains a need for improved packaging which incorporates dispensers and facilitates improved evacuation of the fluid by the consumer.
Accordingly, in a first aspect the present invention provides a consumer package comprising a reservoir for containing a high viscosity fabric treatment fluid, the reservoir comprising an internal surface, the internal surface comprising at least one recess, wherein the or each recess is elongated, curved and follows continuous path spiraling relative to the longitudinal axis of the package and in that the path extends greater than 90 degrees measured as a rotation about the longitudinal axis of the package.
In a second aspect, the present invention provides a consumer package comprising

(i) a reservoir for containing a high viscosity fabric treatment fluid,
(i) the reservoir comprising at least two contiguous walls comprising respective contiguous internal surfaces
(iii) the internal surfaces comprising at least one recess, wherein the or each recess is elongated, curved and follows continuous path across said two contiguous walls.

In a further aspect the invention comprises the combination of the package of the first aspect or the second aspect, together with high viscosity fabric treatment fluid.
In a further aspect, the invention provides a method of rinsing a package containing a high viscosity fabric treatment fluid according to any of the above aspects, wherein the method includes the step of adding water and agitating the bottle to create a fluid swirl directed by said recess/es.
The invention affords the advantage that, in use with pack in motion, the recesses direct the fabric treatment fluid to swirl in vortex-like motion around the longitudinal axis of the package. Thus when there little fabric treatment fluid remaining and the consumer dilutes with water for rinsing out, the arrangement of recesses facilitate fluid swirl when the pack is agitated. This is helpful in improving the rinsing action to ensure the entire product is removed and used. Thus, the invention facilitates consumer enjoyment of the full benefit of all the contents and also ensures the bottle is clean prior to recycling.
Additionally, the arrangement of recesses direct fluid more quickly to the base when there is very little fluid left remaining the pack. With more of the liquid drained down to the base - the consumer can gauge if they have sufficient liquid remaining for their needs. This is especially advantage if the pack has been previously tipped upside down to empty. Whilst liquid collects at the base under gravity, if the pack has been tipped up (as happens in use when the consumer tries to empty) more of the liquid may gather on the upper walls. So once the bottle is returned to its upright position, the recesses help guide the liquid back down to the base. Even if consumers cannot see the inside clearly, as is the case with an opaque, spouted bottle, the collection of liquid at the base is helpful for gauging by weight as the pack is rocked to the side or via a transparent/translucent viewing window.
Accordingly, the package may be partially or wholly opaque and comprise one or more fluid-level viewing windows, said window/s being translucent or transparent.
Preferably, at least a portion of the bottle is transparent. With this feature, the recesses may be visible to the consumer, and also the interaction of the recesses and the fabric treatment fluid as described above.
The or each wall may be defined by an edge region, which may be a corner edge of the package interior such that the walls lie in different, inclined planes, thereby presenting as discrete regions.
Preferably, the or each recess has smoothly shaped sides when viewed in transverse cross section. Preferably, in transverse cross section, the or each recess is V-shaped at its base and then curves smoothly, with decreasing gradient as a function of the recess height, such that the recess curves smoothly into surrounding surface/wall.
Preferably, the or each recess is formed by the intersection of two convexly curved interior surfaces or walls. The curvature may be sub parabolic/a parabolic spandrel.
Preferably, the or each recess comprises an S-shaped curve when the reservoir wall/surface is viewed as side elevation (from the side).
Preferably, the package comprises an upper neck region, and the or each recess begins at the neck region. Preferably, the package comprises at least two recesses, which both begin at the neck region. Preferably the or each recess begin at the neck region and follow a spiral path downward around the bottle. The neck region may be taped so as to narrow toward a dispensing aperture. The dispensing aperture may comprise a spout member preferably, the or each recess begins at the base of the spout member.
Preferably the or each recess path begins at opposite positions on the bottle neck region, whereby the start position is spaced apart by greater than 90 - 180 degrees, preferably 170-180 degrees, most preferably 180 degrees. This creates a pair of staggered spiral recesses.
Preferably the package comprises four walls and the at least one recess comprising a continuous S-curve (in side elevation) which spans three of said walls.
Preferably, the pack comprises a handle recess or aperture. Preferably, the elongate curved recesses are directed toward the handle and directed away from the direction of pouring as defined by the spout orientation. This allows the flow of liquid to swirl with less interruption by handle features.
Preferably, the pack comprises a base portion at an opposite end to the dispensing portion, and the pack is stored to rest on the base portion. Preferably, one or more recesses follow a path from the neck region to the base.
The package may be a bottle.
Preferably, the package comprises a plastic. Examples of suitable plastic materials include high density polyethylene ("HDPE"), low density polyethylene ("LDPE"), polyethylene terephthalate ("PET"), polypropylene ("PP"), polyvinyl chloride, polycarbonate, nylon, and fluorinated ethylene propylene. The bottle can be made via a number of various processes known in the art, such as blow molding, injection molding, and the like. Preferred bottles of the present invention are made of HDPE or PP via an extrusion blow molding process, or PET via an injection blow molding process.
Other examples include any of the following thermoplastic materials: acrylonitrile butadiene styrene (ABS), acrylic, celluloid, cellulose acetate, ethylene vinyl alcohol (E/VAL), fluoroplastics (PTFEs, including FEP, PFA, CTFE, ECTFE, ETFE), ionomers, liquid crystal polymer (LCP), polyacetal (POM or Acetal), polyacrylates (Acrylic), polyacrylonitrile (PAN or Acrylonitrile), polyamide (PA or Nylon), polyamide-imide (PAI), polyaryletherketone (PAEK or Ketone), polybutadiene (PBD), polybutylene (PB), polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polycyclohexylene dimethylene terephthalate (PCT), polycarbonate (PC), polyketone (PK), polyester, polyethylene/polythene/polyethene, polyetheretherketone (PEEK), polyetherimide (PEI), polyethersulfone (PES), polyethylenechlorinates (PEC), polyimide (PI), polymethylpentene (PMP), polyphenylene oxide (PPO), polyphenylene sulfide (PPS), polyphthalamide (PPA), polypropylene (PP), polystyrene (PS), polysulfone (PSU), polyvinyl chloride (PVC), and mixtures thereof. Preferred thermoplastic materials herein include polyvinyl chloride, polyethylene terephthalate, and polypropylene.
Preferably, the pack comprises a bio-based or bio-derived plastic. Preferably, the package comprises a bio-derived PET.
As used herein, the term "PET" refers to polyethylene terephthalate, its copolyesters, and combinations thereof in any form including PET flakes, pellets and recycled PET. The term "PET products" refers to products made from PET, including but not limited to resins, performs, and PET packaging.
The term "bio-based," as used herein, indicates the inclusion of some component that partially or totally derives from at least one bio-based material. As an example, a "bio-based PET" would be a PET that comprises at least one component that partially or totally derives from at least one bio-based material. The term "bio-based materials" and "renewable materials" both refer to organic materials in which the carbon comes from non-fossil biological sources.
Preferably, the fabric treatment fluid has a viscosity in the range 250 - 1500 cps at 25 degrees C.
Preferably, the viscosity is in the range 250 - 550 cPs at 25 degrees C.
Preferably the viscosity is measured at room temperature (25 degrees) using a Brookfield Viscometer.
The fluid may be a liquid or a gel. Preferably, the gel is pourable.
The fluid may comprise a volatile benefit agent, which confers a benefit to fabric.
Suitable volatile benefit agents include but are not limited to perfumes, insect repellents, essential oils, sensates such as menthol and aromatherapy actives, preferably perfumes. Mixtures of volatile benefit agents may be used.
The total amount of volatile benefit agent is preferably from 0.01 to 10 % by weight, more preferably from 0.05 to 5 % by weight, even more preferably from 0.1 to 4.0 %, most preferably from 0.15 to 4.0 % by weight, based on the total weight of the fluid. The preferred volatile benefit agent is a perfume.
The combination of the package and a fluid comprising a volatile benefit agent afford the advantage that whilst the consumer agitates the fluid in the bottle, and consequential swirling motion increases, the consumer experience is greatly enhanced by a greater perfume sensation. Thus, when the consumer rinses the bottle or agitates to encourage liquid to flow to the base after tipping/upturning, the swirling motion increases perfume perception for enhanced enjoyment of recycling-related activities. Accordingly, preferably the volatile benefit agent or at least a portion of said agent evaporates at room temperature.
The perfumes of the of the invention preferably comprise an unconfined (also called non-encapsulated) volatile benefit agent. Where the volatile benefit agent is a perfume, the perfumes described below are suitable for use as the encapsulated volatile benefit agent and also as the unconfined perfume component.
Any suitable perfume or mixture of perfumes may be used.
Useful components of the perfume include materials of both natural and synthetic origin. They include single compounds and mixtures.
By perfume in this context is not only meant a fully formulated product fragrance, but also selected components of that fragrance, particularly those which are prone to loss, such as the so-called 'top notes'.
Top notes are defined by Poucher (Journal of the Society of Cosmetic Chemists 6(2):80 [1955]). Examples of well-known top-notes include citrus oils, linalool, linalyl acetate, lavender, dihydromyrcenol, rose oxide and cis-3-hexanol. Top notes typically comprise 15-25%wt of a perfume liquid and in those embodiments of the invention which contain an increased level of top-notes it is envisaged at that least 20%wt would be present within the encapsulate.
Some or all of the perfume or pro-fragrance may be encapsulated, typical perfume components which it is advantageous to encapsulate, include those with a relatively low boiling point, preferably those with a boiling point of less than 300, preferably 100-250 Celsius and pro-fragrances which can produce such components.
It is also advantageous to include encapsulate perfume components which have a low Clog P (i.e. those which will be partitioned into water), preferably with a Clog P of less than 3.0. These materials, of relatively low boiling point and relatively low Clog P have been called the "delayed blooming" perfume ingredients and include the following materials: Allyl Caproate, Amyl Acetate, Amyl Propionate, Anisic Aldehyde, Anisole, Benzaldehyde, Benzyl Acetate, Benzyl Acetone, Benzyl Alcohol, Benzyl Formate, Benzyl Iso Valerate, Benzyl Propionate, Beta Gamma Hexenol, Camphor Gum, Laevo-Carvone, d-Carvone, Cinnamic Alcohol, Cinamyl Formate, Cis-Jasmone, cis-3-Hexenyl Acetate, Cuminic Alcohol, Cyclal C, Dimethyl Benzyl Carbinol, Dimethyl Benzyl Carbinol Acetate, Ethyl Acetate, Ethyl Aceto Acetate, Ethyl Amyl Ketone, Ethyl Benzoate, Ethyl Butyrate, Ethyl Hexyl Ketone, Ethyl Phenyl Acetate, Eucalyptol, Eugenol, Fenchyl Acetate, Flor Acetate (tricyclo Decenyl Acetate), Frutene (tricyclco Decenyl Propionate), Geraniol, Hexenol, Hexenyl Acetate, Hexyl Acetate, Hexyl Formate, Hydratropic Alcohol, Hydroxycitronellal, Indone, Isoamyl Alcohol, Iso Menthone, Isopulegyl Acetate, Isoquinolone, Ligustral, Linalool, Linalool Oxide, Linalyl Formate, Menthone, Menthyl Acetphenone, Methyl Amyl Ketone, Methyl Anthranilate, Methyl Benzoate, Methyl Benyl Acetate, Methyl Eugenol, Methyl Heptenone, Methyl Heptine Carbonate, Methyl Heptyl Ketone, Methyl Hexyl Ketone, Methyl Phenyl Carbinyl Acetate, Methyl Salicylate, Methyl-N-Methyl Anthranilate, Nerol, Octalactone, Octyl Alcohol, p-Cresol, p-Cresol Methyl Ether, p-Methoxy Acetophenone, p-Methyl Acetophenone, Phenoxy Ethanol, Phenyl Acetaldehyde, Phenyl Ethyl Acetate, Phenyl Ethyl Alcohol, Phenyl Ethyl Dimethyl Carbinol, Prenyl Acetate, Propyl Bornate, Pulegone, Rose Oxide, Safrole, 4-Terpinenol, Alpha-Terpinenol, and/or Viridine
Preferred non-encapsulated perfume ingredients are those hydrophobic perfume components with a ClogP above 3. As used herein, the term "ClogP" means the calculated logarithm to base 10 of the octanol/water partition coefficient (P). The octanol/water partition coefficient of a perfume raw material (PRM) is the ratio between its equilibrium concentrations in octanol and water. Given that this measure is a ratio of the equilibrium concentration of a PRM in a non-polar solvent (octanol) with its concentration in a polar solvent (water), ClogP is also a measure of the hydrophobicity of a material--the higher the ClogP value, the more hydrophobic the material. ClogP values can be readily calculated from a program called "CLOGP" which is available from Daylight Chemical Information Systems Inc., Irvine Calif., USA. Octanol/water partition coefficients are described in more detail in U.S. Pat. No. 5,578,563 .
Perfume components with a ClogP above 3 comprise: Iso E super, citronellol, Ethyl cinnamate, Bangalol, 2,4,6-Trimethylbenzaldehyde, Hexyl cinnamic aldehyde, 2,6-Dimethyl-2-heptanol, Diisobutylcarbinol, Ethyl salicylate, Phenethyl isobutyrate, Ethyl hexyl ketone, Propyl amyl ketone, Dibutyl ketone, Heptyl methyl ketone, 4,5-Dihydrotoluene, Caprylic aldehyde, Citral, Geranial, Isopropyl benzoate, Cyclohexanepropionic acid, Campholene aldehyde, Caprylic acid, Caprylic alcohol, Cuminaldehyde, 1-Ethyl-4-nitrobenzene, Heptyl formate, 4-Isopropylphenol, 2-Isopropylphenol, 3-Isopropylphenol, Allyl disulfide, 4-Methyl-1-phenyl-2-pentanone, 2-Propylfuran, Allyl caproate, Styrene, Isoeugenyl methyl ether, Indonaphthene, Diethyl suberate, L-Menthone, Menthone racemic, p-Cresyl isobutyrate, Butyl butyrate, Ethyl hexanoate, Propyl valerate, n-Pentyl propanoate, Hexyl acetate, Methyl heptanoate, trans-3,3,5-Trimethylcyclohexanol, 3,3,5-Trimethylcyclohexanol, Ethyl p-anisate, 2-Ethyl-1-hexanol, Benzyl isobutyrate, 2,5-Dimethylthiophene, Isobutyl 2-butenoate, Caprylnitrile, gamma-Nonalactone, Nerol, trans-Geraniol, 1-Vinylheptanol, Eucalyptol, 4-Terpinenol, Dihydrocarveol, Ethyl 2-methoxybenzoate, Ethyl cyclohexanecarboxylate, 2-Ethylhexanal, Ethyl amyl carbinol, 2-Octanol, 2-Octanol, Ethyl methylphenylglycidate, Diisobutyl ketone, Coumarone, Propyl isovalerate, Isobutyl butanoate, Isopentyl propanoate, 2-Ethylbutyl acetate, 6-Methyl-tetrahydroquinoline, Eugenyl methyl ether, Ethyl dihydrocinnamate, 3,5-Dimethoxytoluene, Toluene, Ethyl benzoate, n-Butyrophenone, alpha-Terpineol, Methyl 2-methylbenzoate, Methyl 4-methylbenzoate, Methyl 3, methylbenzoate, sec. Butyl n-butyrate, 1,4-Cineole, Fenchyl alcohol, Pinanol, cis-2-Pinanol, 2,4, Dimethylacetophenone, Isoeugenol, Safrole, Methyl 2-octynoate, o-Methylanisole, p-Cresyl methyl ether, Ethyl anthranilate, Linalool, Phenyl butyrate, Ethylene glycol dibutyrate, Diethyl phthalate, Phenyl mercaptan, Cumic alcohol, m-Toluquinoline, 6-Methylquinoline, Lepidine, 2-Ethylbenzaldehyde, 4-Ethylbenzaldehyde, o-Ethylphenol, p-Ethylphenol, m-Ethylphenol, (+)-Pulegone, 2,4-Dimethylbenzaldehyde, Isoxylaldehyde, Ethyl sorbate, Benzyl propionate, 1,3-Dimethylbutyl acetate, Isobutyl isobutanoate, 2,6-Xylenol, 2,4-Xylenol, 2,5-Xylenol, 3,5-Xylenol, Methyl cinnamate, Hexyl methyl ether, Benzyl ethyl ether, Methyl salicylate, Butyl propyl ketone, Ethyl amyl ketone, Hexyl methyl ketone, 2,3-Xylenol, 3,4, Xylenol, Cyclopentadenanolide and Phenyl ethyl 2 phenylacetate 2.
In the fluids of the present invention it is envisaged that there will be four or more, preferably five or more, more preferably six or more or even seven or more different perfume components from the list given of delayed blooming perfumes given above and/or the list of perfume components with a ClogP above 3 present in the perfume.
Suitable insect repellents are related to perfume species (many fall into both classes). The most commonly used insect repellents include: DEET (N,N-diethyl-m-toluamide), essential oil of the lemon eucalyptus (Corymbia citriodora) and its active compound p-menthane-3,8-diol (PMD), Icaridin, also known as Picaridin, D-Limonene, Bayrepel, and KBR 3023, Nepetalactone, also known as "catnip oil", Citronella oil, Permethrin, Neem oil and Bog Myrtle. Preferred insect repellents are related to perfume species.
Insect repellents may be derived from natural sources include: Achillea alpina, alpha-terpinene, Basil oil (Ocimum basilicum), Callicarpa americana (Beautyberry), Camphor, Carvacrol, Castor oil (Ricinus communis), Catnip oil (Nepeta species), Cedar oil (Cedrus atlantica), Celery extract (Apium graveolens), Cinnamon (Cinnamomum Zeylanicum, leaf oil), Citronella oil (Cymbopogon fleusus), Clove oil (Eugenic caryophyllata), Eucalyptus oil (70%+ eucalyptol, also known as cineol), Fennel oil (Foeniculum vulgare), Garlic Oil (Allium sativum), Geranium oil (also known as Pelargonium graveolens), Lavender oil (Lavandula officinalis), Lemon eucalyptus (Corymbia citriodora) essential oil and its active ingredient p-menthane-3,8-diol (PMD), Lemongrass oil (Cymbopogon flexuosus), Marigolds (Tagetes species), Marjoram (Tetranychus urticae and Eutetranychus orientalis), Neem oil (Azadirachta indica), Oleic acid, Peppermint (Mentha x piperita), Pennyroyal (Mentha pulegium), Pyrethrum (from Chrysanthemum species, particularly C. cinerariifolium and C. coccineum), Rosemary oil (Rosmarinus officinalis), Spanish Flag Lantana camara (Helopeltis theivora), Solanum villosum berry juice, Tea tree oil (Melaleuca alternifolia) and Thyme (Thymus species) and mixtures thereof.
Preferred encapsulated insect repellents are mosquito repellents available from Celessence, Rochester, England. Celessence Repel, containing the active ingredient Saltidin™ and Celessence Repel Natural, containing the active Citrepel™ 75. Saltidin is a man-made molecule developed originally by the Bayer Corporation. Citrepel is produced from eucalyptus oils and is high in p-menthane-3,8-diol (PMD). A preferred non-encapsulated repellent is Citriodiol™ supplied by Citrefine.
Another group of volatile benefit agents with which the present invention can be applied are the so-called 'aromatherapy' materials. These include components of essential oils such as Clary Sage, Eucalyptus, Geranium, Lavender, Mace Extract, Neroli, Nutmeg, Spearmint, Sweet Violet Leaf and Valerian.
The viscosity of the fluid may be achieved intrinsically, arising from the particular ingredients / combinations of the fabric treatment fluid.
The fabric treatment fluid may also comprise a viscosity modifier added to regulate viscosity so that it lies within the range of the invention. The viscosity modifier may comprise any component or combination of components as described hereinbelow which modifies e.g. increases or decreases the viscosity of the composition. The viscosity modifier may comprise a hydrotrope . The hydrotrope may be a short-chain functionalized amphiphiles. Examples of short-chain amphiphiles include the alkali metal salts of xylenesulfonic acid, cumenesulfonic acid and octyl sulphonic acid, and the like. In addition, organic solvents and monohydric and polyhydric alcohols with a molecular weight of less than about 500, such as, for example, ethanol, isoporopanol, acetone, propylene glycol and glycerol, may also be used as hydrotropes.
The viscosity modifier may comprise one or more salts e.g. CaCl₂, MgCl₂, NaCl or other salts or combinations thereof containing other alkali or alkaline earth metal cations and halide anions, and the like and any combination thereof.
The viscosity modifier may comprise one or more polysaccharide e.g. GuarGum, Xanthan Gum.
The viscosity modifier may comprise one or more external structurant for example a cellulosic structurant such as micro-fibrous cellulose (MFC) or carboxy methyl cellulos or a clay or citrus pulp material or any combination thereof.
The viscosity modifier may comprise one or more diluents.
The viscosity modifier may comprise one or more polymers as described below. alkylene oxide can be a homopolymer (for example ethylene oxide) or a random or block copolymer. The terminal group of the alkylene oxide side chain can be further reacted to give an anionic character to the molecule (for example to give carboxylic acid or sulphonic acid functionality).
The viscosity modifier may comprise a thickening polymer.
The thickening polymer comprises linear/crosslinked alkali swellable acrylic copolymers/ ASE/ HASE/ C-HASE.
The preferred thickening polymers are linear/crosslinked alkali swellable acrylic copolymers/ ASE/ HASE/ C-HASE. Polymers that require alkaline conditions to swell and so to provide thickening of the detergent fluid should be added such that they are exposed to alkaline conditions at least during the manufacture of the fluid. It is not essential that the finished fluid is alkaline.
The thickening polymer is a water swellable polyacrylate. Such polymers may be alkali swellable copolymers (ASE) optionally with a hydrophobic modification on at least one of the monomers (HASE) or with crosslinking groups (CASE) and possibly with both hydrophobic modification and crosslinking (C-HASE).
As used herein the term "(meth)acrylic" refers to acrylic or methacrylic, and "(meth)acrylate" refers to acrylate or methacrylate. The term "acrylic polymers" refers to polymers of acrylic monomers, i.e., acrylic acid (AA), methacrylic acid (MAA) and their esters, and copolymers comprising at least 50% of acrylic monomers. Esters of AA and MAA include, but are not limited to, methyl methacrylate (MMA), ethyl methacrylate (EMA), butyl methacrylate (BMA), hydroxyethyl methacrylate (HEMA), methyl acrylate (MA), ethyl acrylate (EA), butyl acrylate (BA), and hydroxyethyl acrylate (HEA), as well as other alkyl esters of AA or MAA.
Preferably, acrylic polymers have at least 75% of monomer residues derived from (meth)acrylic acid or (meth)acrylate monomers, more preferably at least 90%, more preferably at least 95%, and most preferably at least 98%. The term "vinyl monomer" refers to a monomer suitable for addition polymerization and containing a single polymerizable carbon-carbon double bond.
Hydrophobic properties may be imparted by use of lipophilically-modified (meth)acrylate residues each of which may contain either one, or a plurality of, lipophilic groups. Such groups are suitably in the same copolymer component as and attached to hydrophilic chains, such as for example polyoxyethylene chains. Alternatively the copolymer may contain a vinyl group which may be used to copolymerize the polymer to other vinyl-containing entities to alter or improve the properties of the polymer. Polymerizable groups may be attached to lipophilic groups directly, or indirectly for example via one or more, for example up to 60, preferably up to 40, water-soluble linker groups, for example, -CH[R]CH2O- or - CH[R]CH2NH- groups wherein R is hydrogen or methyl. Alternatively, the polymerizable group may be attached to the lipophilic group by reaction of the hydrophilic, for example polyoxyethylene, component with a urethane compound containing unsaturation. The molecular weight of the lipophilic-modifying group or groups is preferably selected together with the number of such groups to give the required minimum lipophilic content in the copolymer, and preferably, for satisfactory performance in a wide range of liquids.
The amount of lipophilically-modified component in the copolymers preferably is at least 5%, more preferably at least 7.5%, and most preferably at least 10%; and preferably is no more than 25%, more preferably no more than 20%, more preferably no more than 18%, and most preferably no more than 15%.
The lipophilic-modifying groups themselves are preferably straight chain saturated alkyl groups, but may be aralkyl or alkyl carbocyclic groups such as alkylphenyl groups, having at least 6, and up to 30 carbon atoms although branched chain groups may be contemplated. It is understood that the alkyl groups may be either of synthetic or of natural origin and, in the latter case particularly, may contain a range of chain lengths.
The chain length of the lipophilic-modifying groups is preferably is below 25, more preferably from 8 to 22, and most preferably from 10 to 18 carbon atoms. The hydrophilic component of the lipophilically-modified copolymer may suitably be a polyoxyethylene component preferably comprising at least one chain of at least 2, preferably at least 5, more preferably at least 10, and up to 60, preferably up to 40, more preferably up to 30 ethylene oxide units. Such components are usually produced in a mixture of chain lengths.
Preferably, the C2-C4 alkyl (meth)acrylate residues in the copolymer are C2-C3 alkyl (meth)acrylate residues, and most preferably EA. Preferably, the amount of C2-C4 alkyl (meth)acrylate residues is at least 20%, more preferably at least 30%, more preferably at least 40% and most preferably at least 50%. Preferably, the amount of C2-C4 alkyl (meth)acrylate residues is no more than 75%, more preferably no more than 70%, and most preferably no more than 65%. Preferably, the amount of acrylic acid residues in the copolymer used in the present invention is at least 5%, more preferably at least 7.5%, more preferably at least 10%, and most preferably at least 15%. Preferably, the amount of acrylic acid residues is no more than 27.5%, more preferably no more than 25%, and most preferably no more than 22%. Acrylic acid residues are introduced into the copolymer by inclusion of either acrylic acid, or an acrylic acid oligomer having a polymerizable vinyl group, in the monomer mixture used to produce the copolymer. Preferably, the copolymer contains residues derived from methacrylic acid in an amount that provides a total acrylic acid plus methacrylic acid content of at least 15%, more preferably at least 17.5%, and most preferably at least 20%. Preferably, the total acrylic acid plus methacrylic acid content of the copolymer is no more than 65%, more preferably no more than 50%, and most preferably no more than 40%. Optionally, the copolymer also contains from 2% to 25%, preferably from 5% to 20%, of a hydrophilic comonomer, preferably one having hydroxyl, carboxylic acid or sulphonic acid functionality. Examples of hydrophilic comonomers include 2-hydroxyethyl (meth)acrylate (HEMA or HEA), itaconic acid and acrylamido-2-methylpropanesulfonic acid.
The fluids of the present invention contain from 0.1% and preferably no more than 10% of thickening polymer; i.e., the total amount of copolymer(s) is in this range. Preferably, the amount of copolymer in the fluid is at least 0.3%, more preferably at least 0.5%, more preferably at least 0.7%, and most preferably at least 1 %. Preferably, the amount of copolymer in the aqueous fluid is no more than 7%, more preferably no more than 5%, and most preferably no more than 3%. Preferably, the copolymer is an acrylic polymer. The copolymer, in aqueous dispersion or in the dry form, may be blended into an aqueous system to be thickened followed, in the case of a pH-responsive thickener, by a suitable addition of acidic or basic material if required. In the case of copolymeric pH-responsive thickeners, the pH of the system to be thickened is at, or is adjusted to, at least 5, preferably at least 6, more preferably at least 7; preferably the pH is adjusted to no more than 13. The neutralizing agent is preferably a base such as an amine base or an alkali metal or ammonium hydroxide, most preferably sodium hydroxide, ammonium hydroxide or triethanolamine (TEA). Alternatively, the copolymer may first be neutralized in aqueous dispersion and then blended. The surfactant preferably is blended into the aqueous fluid separately from the copolymer prior to neutralization.
The molecular weight of un-crosslinked polymer is typically in the range of about 100,000 to 1 million.
In the case that the polymer is crosslinked, a crosslinking agent, such as a monomer having two or more ethylenic unsaturated groups, is included with the copolymer components during polymerization. Examples of such monomers include diallyl phthalate, divinylbenzene, allyl methacrylate, diacrylobutylene or ethylene glycol dimethacrylate. When used, the amount of crosslinking agent is typically from 0.01% to 2%, preferably from 0.1 to 1% and more preferably from 0.2 to 0.8%, based on weight of the copolymer components.
The copolymer may be prepared in the presence of a chain transfer agent when a crosslinking agent is used. Examples of suitable chain transfer agents are carbon tetrachloride, bromoform, bromotrichloromethane, and compounds having a mercapto group, e.g., long chain alkyl mercaptans and thioesters such as dodecyl-, octyl-, tetradecyl- or hexadecyl-mercaptans or butyl-, isooctyl- or dodecyl-thioglycolates. When used, the amount of chain transfer agent is typically from 0.01 % to 5%, preferably from 0.1 % to 1%, based on weight of the copolymer components. If the crosslinking agent is used in conjunction with a chain transfer agent, which are conflicting operations for polymerization purposes, not only is exceptional efficiency observed but also very high compatibility with hydrophilic surfactants, as manifested by increased product clarity.
Hydrophobically modified polyacrylate thickening polymers are available as Acusol polymers from Dow.
An alternative or additional polymer type that may be utilised is described in WO2011/117427 (Lamberti ). And comprises a thickening agent which is a crosslinked alkali swellable polyacrylate, e.g. Viscolam thickening polymers from Lamberti.
Various non-limiting embodiments of the invention will now be more particularly described with reference to the following figures in which:

Figure 1 is a photograph of the package of according to the invention, shown dissembled to show the inside.
Figure 2 is a schematic of the view of Figure 1, also showing spout feature
Figure 3 is a schematic of a package as in Figure 1, shown in plan view from the top, showing a spiral path of the recesses.

Unless stated otherwise, all proportions are given in weight percent by weight of the total fluid.

Exemplary Fabric Treatment (Washing) Liquid

Ingredient as 100% active	Wt %
Neodol 25-9*	6-8
Alcohol ethoxy sulfate	12-15
Linear alkylbenzene sulfonate	6-9
Sodium citrate, dihydrate	3-6
Propylene glycol	4-8
Sorbitol	3-6
Sodium tetraborate pentahydrate	2-4
Volatile benefit agent: perfume and Minor additives and water	to 100%

*C₁₂-C₁₅ alkoxylated (9EO) chain group

Referring to the drawings , a consumer package, a bottle 1 is shown dissembled (cut open) to reveal the interior. In figure 1 the spout has been removed. The package is for uses with a high viscosity fluid, with components as in the above example. The consumer package has a reservoir 3 for containing a high viscosity fabric treatment fluid.
The reservoir has an overall continuous internal surface with four contiguous walls 5,7,9,11 . Each wall comprises respective contiguous internal surfaces 15, 17, 19, 21 containing multiple elongate curved recesses 29, 31, 33, 35. The recesses 29, 31, 33, 35 .
Certain recesses are formed as a continuous S-curve which spans multiple walls.
The package comprises an upper neck region 50 with spout member 55 shown in figure 2 and two corresponding recesses begin at the neck region 50, and more specifically at the base of the spout member 55. These two recesses have start positions at opposition positions of the bottle about 180 degrees apart. This creates a pair of staggered helical recesses. As shown in Figure 3 shows a view of the helical path tracked by the recesses, downward from the neck, around the longitudinal axis of bottle.
The package is formed from PET, with a handle 60 and a viewing window (not shown) to show the fill-level of the fluid.
In use with the package in motion eg. By agitation, the recesses direct the fabric treatment fluid to swirl in vortex-like motion around the longitudinal axis of the package. Thus when there little fabric treatment fluid remaining and the consumer dilutes with water for rinsing out, the arrangement of recesses facilitate fluid swirl when the pack is agitated. This is helpful in improving the rinsing action to ensure the entire product is removed and used. Thus, the invention facilitates consumer enjoyment of the full benefit of all the contents and also ensures the bottle is clean prior to recycling.
Additionally, the arrangement of recesses direct fluid more quickly to the base when there is very little fluid left remaining the pack. With more of the liquid drained down to the base - the consumer can gauge if they have sufficient liquid remaining for their needs. This is especially advantage if the pack has been previously tipped upside down to empty. Whilst liquid collects at the base under gravity, if the pack has been tipped up (as happens in use when the consumer tries to empty) more of the liquid may gather on the upper walls. So once the bottle is returned to its upright position, the recesses help guide the liquid back down to the base. Even if consumers cannot see the inside clearly, as is the case with an opaque, spouted bottle, the collection of liquid at the base is helpful for gauging by weight as the pack is rocked to the side or via a transparent/translucent viewing window.
The package comprises a closure device (not shown) such as an over cap
It is of course to be understood that the invention is not intended to be restricted to the details of the above embodiment which are described by way of example only.

Claims

A package comprising a reservoir for containing a high viscosity fabric treatment fluid, the reservoir comprising an internal surface, the internal surface comprising at least one recess, wherein the or each recess is elongated, curved and follows continuous path spiraling relative to the longitudinal axis of the package and in that the path extends greater than 90 degrees measured as a rotation about the longitudinal axis of the package.
A package comprising:
(i) a reservoir for containing a high viscosity fabric treatment fluid,

(i) the reservoir comprising at least two contiguous walls comprising respective contiguous internal surfaces

(iii) the internal surfaces comprising at least one recess, wherein the or each recess is elongated, curved and follows continuous path across said two contiguous walls.
A package according to claim 1 or claim 2, in combination with high viscosity fabric treatment fluid.
A package according to any preceding claim, wherein the package is partially or wholly opaque and comprises one or more fluid-level viewing windows, the or each window being translucent or transparent.
A package according to any preceding claim, wherein the or each recess comprises an S-shaped curve when the reservoir inner surface is viewed as side elevation.
A package according to any preceding claim, package comprises an upper neck region, and one or more recesses begins at the neck region.
A package according to claim 6, wherein the each recess begins at the neck region and follows a spiral path downward around the longitudinal axis of the bottle.
A package according to claim 7 wherein the neck region comprises a spout member and one or more recesses begin at the base of the spout member.
A package according to any preceding claim, wherein one or more recesses follow a path from the neck region to the package base.
A package according to any preceding claim, wherein the package comprises a bio-based or bio-derived plastic.
A package according to any one of claims 3 to 10 wherein the fabric treatment fluid has a viscosity in the range 250 - 1500 cps at 25 degrees C.
A package according to any one of claims 3 to 11 wherein the fluid comprises a volatile benefit agent which confers a benefit to fabric.
A method of rinsing a package containing a high viscosity fabric treatment fluid according to any of the above aspects, wherein the method includes the step of adding water and agitating the bottle to create a fluid swirl directed by one or more recesses.
A package or method as substantially as described and/or illustrated herein.