Consumer product comprising delivery particles having a high core:wall ratio

Abstract

The present invention provides consumer products comprising a treatment adjunct and delivery particles having a particular size, a particular monomer (e.g., a multifunctional (meth)acrylate monomer), and a particular core:wall polymer weight ratio. The present invention provides methods related to the use and manufacture of such compositions, including methods of treating a surface such as a fabric.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to consumer products comprising a treatment adjunct and delivery particles having a particular size, a particular monomer (e.g., a multifunctional (meth)acrylate monomer), and a particular core:wall polymer weight ratio. The invention also relates to methods related to the use and manufacture of such compositions, including methods of treating a surface such as fabric. BACKGROUND

[0002] Manufacturers of consumer products desire to effectively use benefit agents and ensure good performance of their products in end use. Particular benefit agents such as fragrances can be encapsulated in core / shell delivery particles. Such particles can deposit on a target surface and release the benefit agent under a particular trigger condition, such as by rubbing or other pressure to break.

[0003] To improve delivery efficiency, a variety of measures can be taken, but each tends to have drawbacks. For example, particle size can be increased, but large particles tend to leak more than small particles and can not break at the desired time. The relative amount of benefit agent in the core can be increased relative to the wall, but as the wall becomes relatively thin, this also tends to result in relatively leaky particles. In addition, brittle capsules can break prematurely during the manufacturing process, for example due to mixing shear applied to the product composition. Additional wall material can reduce leakage and / or improve capsule strength, but then the particles can not break sufficiently at the desired point of contact and have a lower payload or delivery efficiency. Furthermore, given the many known wall materials in the art, there is little guidance as to what material will be most effective for a given application or particle type.

[0004] There is a need for consumer products comprising delivery particles that provide effective benefit agent delivery, including a relatively low leakage profile and a desired release profile. SUMMARY

[0005] The present disclosure relates to consumer products comprising a treatment adjunct and delivery particles having a particular size, a particular monomer (e.g., a multifunctional (meth)acrylate monomer), and a particular core:wall polymer weight ratio. The invention also relates to methods related to the use and manufacture of such compositions, including methods of treating a surface such as fabric.

[0006] For example, the present disclosure is directed to a consumer product composition comprising a processing aid and a population of delivery particles, wherein the delivery particles comprise a core and a polymeric wall surrounding the core, wherein the core comprises a benefit agent and a partitioning modifier, wherein the partitioning modifier is present in the core at a level of from about 5% to about 55% by weight of the core, wherein the polymeric wall comprises a (meth)acrylate polymer derived at least in part from one or more oil-soluble or oil-dispersible multifunctional (meth)acrylate monomers or oligomers having at least three free-radically polymerizable functional groups, with the proviso that at least one of the free-radically polymerizable groups is an acrylate or methacrylate; wherein the core and the polymeric wall are present in a weight ratio of from about 96:4 to about 99.5:0.5; and wherein the delivery particles are characterized by a volume weighted particle size of from 30 microns to 50 microns.

[0007] The present disclosure is also directed to a method of treating a surface, preferably a fabric, wherein the method comprises the step of contacting the surface with a consumer product composition according to the present disclosure, optionally in the presence of water. BRIEF DESCRIPTION OF DRAWINGS

[0008] The figures herein are illustrative in nature but are not intended to be limiting.

[0009] Figure 1 is a graph depicting the percent leakage of perfume delivery particles made at 18 and 36 micron diameters according to the present disclosure and compared to 36 micron microcapsules using (meth)acrylate monomers of various functionalities as shown in the absence of isopropyl myristate.

[0010] Figure 2 is a graph depicting the 1 week leakage of 18 and 36 micron diameter particles of (meth)acrylate monomers of various functionalities. Particles dispersed in liquid laundry detergent were measured at 35°C, measurement was taken at 1 week. Control is the same capsule at 36 microns without any isopropyl myristate.

[0011] Figure 3 is a graph depicting the percent of free oil obtained from perfume delivery particles made at 18 and 36 micron diameters using the wall materials shown.

[0012] Figure 4 is a graph depicting the percent leakage by weight of delivery particles made at 18 and 36 micron diameters using various walls at 40% isopropyl myristate by weight of core. DETAILED DESCRIPTION

[0013] The present disclosure relates to consumer products comprising a population of delivery particles. The delivery particles (or simply "particles" as used herein) are core / shell particles that comprise a benefit agent in the core, and typically comprise a partitioning modifier.

[0014] Surprisingly, it has been discovered that delivery particles having desirable leakage and release characteristics can be formed by careful selection of a combination of factors - e.g., core:wall polymer weight ratio, particle size, and monomers used to form the polymer wall. As a result of the combinations described herein, consumer products of delivery particles having unexpectedly high payloads can be formulated, yet they still exhibit reduced leakage of the benefit agent, and provide desirable odor release characteristics.

[0015] Particles, compositions, and related methods are described in greater detail hereinafter.

[0016] As used herein, the articles "a" and "an" are understood to mean one or more of the items that are described. As used herein, the terms "includes," "including," and "has," "having," and "comprises," "comprising," are intended to be non-limiting. The compositions of the present disclosure can comprise, consist essentially of, or consist of the components of the present disclosure.

[0017] The term "substantially free of" or "substantially free from" can be used herein. This means that the indicated material is very small, not intentionally added to the composition to form part of that composition, or preferably, the indicated material is not present at analytically detectable levels. This means compositions that include where the indicated material is present only as an impurity in one of the other materials that is intentionally added. If at all, the indicated material can be present at levels of less than 1%, or less than 0.1%, or less than 0.01%, or even 0%, by weight of the composition.

[0018] As used herein, "consumer product" means baby care, beauty care, fabric and home care, family care, feminine care, and / or health care or devices intended to be used or consumed in a sale transaction and not intended for subsequent commercial manufacture or modification. Such products include, but are not limited to, diapers, bibs, wipes; products and / or methods relating to the treatment of human hair, including bleaching, coloring, dyeing, conditioning, shampooing, styling; deodorants and antiperspirants; personal cleansing; skin care, including the application of creams, lotions and other topically applied products for consumer use; and shaving products, products and / or methods relating to the treatment of fabrics, hard surfaces, and any other surfaces in the area of fabric and home care, including: air care, car care, dishwashing, fabric conditioning (including softening), laundry detergency, and laundry and rinse additive and / or care, hard surface cleaning and / or treatment, and other cleaning for consumer or institutional use; products and / or methods relating to bath tissue, facial tissue, paper handkerchiefs, and / or paper towels; tampons, feminine napkins; adult incontinence products; products and / or methods relating to oral care, including toothpastes, tooth gels, tooth rinses, denture adhesives, tooth whitening; over-the-counter health care, including cough and cold medicines; pest control products; and water purification.

[0019] As used herein, the phrase "fabric care composition" includes compositions and formulations designed for treating fabrics. Such compositions include, but are not limited to, laundry cleaning compositions and detergents, fabric softening compositions, fabric enhancing compositions, fabric freshening compositions, laundry prewash, laundry pre-treaters, laundry additives, spray products, dry cleaning agents or compositions, laundry rinse additives, wash additives, post-rinse fabric treatment, ironing aids, unit dose formulations, delayed delivery formulations, detergents contained on or in a porous substrate or nonwoven sheet, and other suitable forms that can be apparent to those skilled in the art in light of the teachings herein. Such compositions can be used as a laundry pre-treatment, a laundry after-treatment, or can be added during the rinse cycle or wash cycle of a laundry operation.

[0020] As used herein, reference to the term "(meth)acrylate" or "(meth)acrylic acid" is understood to refer to both acrylate and methacrylate versions of the specified monomer, oligomer, and / or prepolymer. For example, "(meth)allyl acrylate" indicates that both the methacrylate and acrylate versions of the allyl ester are possible, similarly, reference to alkyl esters of (meth)acrylic acid indicates that both the alkyl ester of acrylic acid and the alkyl ester of methacrylic acid are possible, similarly, poly(meth)acrylate indicates that both polyacrylate and polymethacrylate are possible. Poly(meth)acrylate materials are intended to encompass a broad range of polymeric materials including, for example, polyester poly(meth)acrylates, polyurethanes, and polyurethane poly(meth)acrylates (especially those prepared by reaction of a (meth)acrylic acid hydroxyalkyl ester with a polyisocyanate or polyurethane polyisocyanate), methyl cyanoacrylate, ethyl cyanoacrylate, diethylene glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, ethylene glycol di(meth)acrylate, allyl (meth)acrylate, glycidyl (meth)acrylate, (meth)acrylate functional siloxanes, diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, and tetraethylene glycol di(meth)acrylate, dipropylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, di(pentylene glycol) di(meth)acrylate, ethylene di(meth)acrylate, neopentyl glycol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, ethoxylated bisphenol A di(meth)acrylate, bisphenol A di(meth)acrylate, diglycerol di(meth)acrylate, tetraethylene glycol dichloroacrylate, 1,3- butanediol di(meth)acrylate, neopentyl di(meth)acrylate, trimethylolpropane tri(meth)acrylate, and various multifunctional (meth)acrylates. Monofunctional (meth)acrylates, i.e., those containing only one (meth)acrylate group, can also be used advantageously. Typical mono(meth)acrylates include 2-ethylhexyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, cyanoethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, p-dimethylaminoethyl (meth)acrylate, lauryl (meth)acrylate, cyclohexyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, chlorobenzyl (meth)acrylate, aminoalkyl (meth)acrylates, various alkyl (meth)acrylates, and glycidyl (meth)acrylate. Mixtures of (meth)acrylates or their derivatives can also be used, as well as combinations of one or more (meth)acrylate monomers, oligomers, and / or prepolymers or their derivatives with other copolymerizable monomers, including acrylonitrile and methacrylonitrile.

[0021] As used herein, "delivery particle," "particle," "encapsulate," "microcapsule," and "capsule" are used interchangeably, unless otherwise indicated.

[0022] For ease of reference in the present specification and claims, the term "monomer" as used herein with respect to the wall polymer is understood to mean a monomer, but also includes oligomers or monomers, as well as prepolymers formed from the particular monomer.

[0023] Unless otherwise indicated, all component or composition levels are in reference to active levels, that is, levels of active components or compounds, and do not include impurities or by-products that can be present in commercially available sources of such components or compounds.

[0024] All temperatures herein are in degrees Celsius (°C) unless otherwise indicated. All measurements herein are made at 20 °C and at atmospheric pressure unless otherwise designated.

[0025] In all embodiments of the present disclosure, all percentages are by weight of the total composition, unless specifically stated otherwise. All ratios are weight ratios, unless specifically stated otherwise.

[0026] It should be understood that every maximum numerical limitation given throughout this specification includes every lower numerical limitation, as if such lower numerical limitations were expressly written herein. Every minimum numerical limitation given throughout this specification will include every higher numerical limitation, as if such higher numerical limitations were expressly written herein. Every numerical range given throughout this specification will include every narrower numerical range that falls within such broader numerical range, as if such narrower numerical ranges were all expressly written herein.

[0027] Consumer product composition

[0028] The present disclosure relates to consumer product compositions (or simply "compositions" as used herein). The compositions of the present disclosure can comprise a delivery particle population and a treatment adjunct, each described in greater detail below.

[0029] The consumer product compositions of the present disclosure can be used in baby care, beauty care, fabric care, home care, household care, feminine care, and / or health care applications. The consumer product compositions can be used to treat a surface, such as a fabric, hair, or skin. The consumer product compositions can be intended to be used or consumed in its form as it is sold. The consumer product compositions can not be intended for subsequent commercial manufacture or modification.

[0030] The consumer product compositions can be a fabric care composition, a hard surface cleaner composition, a dish care composition, a hair care composition such as a shampoo or conditioner, a body cleansing composition, or a mixture thereof.

[0031] The consumer product composition can be a fabric care composition, such as a laundry detergent composition (including a heavy duty liquid detergent or unit dose article), a fabric conditioning composition (including a liquid fabric softening and / or enhancing composition), a laundry additive, a fabric pretreatment composition (including a spray, pourable liquid or spray), a fabric refresher composition (including a spray), or a mixture thereof.

[0032] The composition can be a cosmetic care composition, such as a hair treatment product (including a shampoo and / or a conditioner), a skin care product (including a cream, a lotion or other topically applied product for consumer use), a shave care product (including a shave lotion, a foam, or a pre- or post-shave treatment), a personal cleansing product (including a liquid body wash, a liquid hand soap, and / or a bar soap), a deodorant and / or antiperspirant, or a mixture thereof.

[0033] The composition can be a home care composition, such as an air care, a car care, a dishwashing, a hard surface cleaning and / or treatment, and other cleaning for consumer or institutional use.

[0034] The consumer product composition can be in the form of a liquid composition, a granular composition, a hydrocolloid, a single-compartment pouch, a multi-compartment pouch, a dissolvable sheet, a pastille or bead, a fibrous article, a tablet, a stick, a bar, a flake, a foam / mousse, a nonwoven sheet, or a mixture thereof.

[0035] The composition can be in a liquid form. The liquid composition can comprise from about 30%, or about 40%, or about 50% to about 99%, or to about 95%, or to about 90%, or to about 75%, or to about 70%, or to about 60% by weight of the composition, of water. The liquid composition can be a liquid laundry detergent, a liquid fabric conditioner, a liquid dishwashing detergent, a shampoo, a hair conditioner, or a mixture thereof.

[0036] The composition can be in a solid form. The solid composition can be a powdery or granular composition. Such compositions can be agglomerated or spray-dried. Such compositions can include a plurality of particles or granules, at least some of which include a different composition. The composition can be a powdery or granular cleaning composition, which can comprise a bleaching agent. The composition can be in the form of a small bead or pastille, which can be made from a liquid melt. The composition can be an extruded product.

[0037] The composition can be in the form of a combined dosage article such as a tablet, pouch, sheet, or fibrous article. Such pouches typically include a water-soluble film, such as a polyvinyl alcohol water-soluble film, which at least partially encloses the composition. Suitable films are available from MonoSol, LLC (Indiana, USA). The composition can be enclosed in a single-compartment pouch or a multi-compartment pouch. Multi-compartment pouches can have at least two, at least three, or at least four compartments. Multi-compartment pouches can include side-by-side and / or stacked compartments. The composition contained in the pouch or compartments thereof can be a liquid, a solid (such as a powder), or a combination thereof. The pouch composition can have a relatively low amount of water, for example, less than about 20%, or less than about 15%, or less than about 12%, or less than about 10%, or less than about 8% water by weight of the detergent composition.

[0038] The composition can be in the form of a spray and can be dispensed from a bottle, for example, via a trigger sprayer and / or an aerosol container having a valve.

[0039] The composition can have a viscosity at 20 s -1 and 21 °C of from 1 centipoise to 1500 centipoise (1 mPa*s to 1500 mPa*s), 100 centipoise to 1000 centipoise (100 mPa*s to 1000 mPa*s), or 200 centipoise to 500 centipoise (200 mPa*s to 500 mPa*s).

[0040] Other components and / or features of the composition, such as delivery particles and consumer product adjunct materials, are discussed in more detail below.

[0041] Delivery particle population

[0042] The compositions and products of the present disclosure comprise a population of delivery particles.

[0043] The composition can comprise from about 0.05% to about 20%, or from about 0.05% to about 10%, or from about 0.1% to about 5%, or from about 0.2% to about 2%, by weight of the composition, of delivery particles. The composition can comprise a sufficient amount of delivery particles to provide the composition with from about 0.05% to about 10%, or from about 0.1% to about 5%, or from about 0.1% to about 2%, by weight of the composition, of perfume. When the amount or weight percent of delivery particles is discussed herein, it means the sum of the shell material and the core material.

[0044] The delivery particles generally comprise a core and a shell, wherein the shell encloses the core. As described in more detail below, the core can comprise a benefit agent and optionally a partitioning modifier, and the shell can comprise certain polymers, namely acrylate materials.

[0045] The delivery particles can have a volume-weighted median particle size of from about 30 microns to about 50 microns, preferably from about 30 microns to about 40 microns.

[0046] The population of delivery particles can have a relatively wide particle size distribution. As noted above, it is believed that the broad distribution contributes to the effectiveness of the composition on various types of fabrics or garments. The population of delivery particles can be characterized by a width index, which is a way of characterizing the size distribution.

[0047] The width index is calculated by determining the particle size at which 90% of the cumulative particle volume (90% size), the particle size at which 5% of the cumulative particle volume (5% size), and the median volume weighted particle size (50% size; where 50% of the particle volume is above and below this size). These values can be used in the following equation to determine the width index of the population of delivery particles.

[0048] Width Index = (90% size - 5% size) / 50% size

[0049] The population of delivery particles of the present disclosure can be characterized by a width index of at least 1.0, preferably at least 1.1, more preferably at least 1.2. The population of delivery particles can be characterized by a width index of from about 1.0 to about 2.0, or from about 1.0 to about 1.8, or from about 1.1 to about 1.6, or from about 1.1 to about 1.5, or from about 1.2 to about 1.5, or from about 1.2 to about 1.4. Relatively higher width index values indicate a relatively wider particle size distribution.

[0050] The population of delivery particles can be characterized by one or more of the following: (i) a 5thpercentile volume weighted particle size of from about 1 micron to about 15 microns; (ii) a 50thpercentile (median) volume weighted particle size of from about 30 microns to about 50 microns; (iii) a 90thpercentile volume weighted particle size of from about 40 microns to about 80 microns; or (iv) combinations thereof.

[0051] The delivery particles can be characterized by a fracture strength. The fracture strength is determined according to the procedure provided in the Test Methods section below. The population of delivery particles can be characterized by an average fracture strength of from about 0.2 MPa to about 30 MPa, or from about 0.4 MPa to about 10 MPa, or from about 0.6 MPa to about 5 MPa, or even from about 0.8 MPa to about 4 MPa (where the median / d 50 50thpercentile particle size of the population is measured across several capsules at the size). The population of delivery particles can be characterized by an average fracture strength of from about 0.2 MPa to about 10 MPa, or from about 0.5 MPa to about 8 MPa, or from about 0.5 MPa to about 6 MPa, or from about 0.5 MPa to about 5 MPa, or from about 0.7 MPa to about 4 MPa, or from about 1 MPa to about 3 MPa. The population of delivery particles can be characterized by an average fracture strength of from about 0.2 MPa to about 10 MPa, preferably from about 0.5 MPa to about 8 MPa, more preferably from about 0.5 MPa to about 5 MPa. It is believed that at these levels the d 50Delivery particles having an average break strength will perform well at one or more contact points that are typical for surfaces such as fabrics treated with compositions according to the present disclosure.

[0052] As described in greater detail below, the delivery particles of the present disclosure comprise a core and a shell surrounding the core. It has been surprisingly found that, among other things, selecting a particular ratio of core material to shell material can yield a population of delivery particles that exhibit improved performance. Without wishing to be bound by theory, it is believed that formulating delivery particles having a relatively high core to wall ratio provides a population having the desired break strength distribution described in the present disclosure. Additionally, delivery particles having a high core:wall ratio can more efficiently deliver benefit agents, requiring less wall material to deliver the same amount of benefit agent. Furthermore, because the delivery particles have a relatively high benefit agent loading, less delivery particles can be required for a particular composition, thereby saving cost and / or conserving formulation space.

[0053] The delivery particles of the present disclosure can be characterized by a core to polymer wall weight ratio (also referred to as a "core:polymer wall ratio," "core-wall ratio," "core:wall ratio," or even a "C:W ratio," etc., as used herein). A relatively high core:wall ratio is generally preferred to increase the delivery efficiency or relative payload of the particle. However, if the ratio is too high, the capsule can become too brittle or leak and provide suboptimal performance.

[0054] As used herein, the core:polymer wall ratio is understood to be calculated based on the weight of the reacted wall-forming material and initiator that make up the polymer wall, and for purposes of calculation, the calculation excludes entrapped non-structural materials, such as entrapped emulsifiers. The calculation is based on the amount of starting charge (i.e., charge monomers and initiator). The calculation of sample core:wall polymer ratio is illustrated in Example 1 below. If the amount of starting charge is not readily available, the core:wall ratio is determined according to the Analysis Determination Procedure for Core:Wall Ratio provided in the Test Methods section.

[0055] The delivery particles (preferably the population of delivery particles) can be characterized by a core to polymer wall weight ratio of at least about 96:4, more preferably at least about 97:3, even more preferably at least about 98:2, even more preferably at least about 99: 1. The delivery particles (preferably the population of delivery particles) can be characterized by a core to polymer wall weight ratio of from about 96:4 to about 99.5:0.5, preferably from about 96:4 to about 99: 1, more preferably from about 97:3 to about 99: 1, even more preferably from about 98:2 to about 99: 1. The core to polymer wall weight ratio can be from about 96:4 to about 99: 1, or from about 96:4 to about 98:2, or from about 97:3 to about 98:2.

[0056] Components and methods related to the delivery particles of the present disclosure are described in greater detail below.

[0057] a. Polymeric wall

[0058] The delivery particles of the present disclosure include a polymeric wall surrounding a core. Note that the terms "polymeric wall," "wall," and "shell" are used interchangeably as used herein, unless otherwise indicated.

[0059] The polymeric wall comprises a polymeric material, in particular a (meth)acrylate polymer. The (meth)acrylate polymer is derived, at least in part, from one or more oil-soluble or oil-dispersible multifunctional (meth)acrylate monomers or oligomers.

[0060] The polymeric wall can comprise from about 5% to about 100%, preferably from about 40% to about 100%, more preferably from about 50% to about 100%, more preferably from about 75% to about 100%, more preferably from about 85% to about 100%, more preferably from about 90% to about 100%, even more preferably from about 95% to about 100%, of the (meth)acrylate polymer, by weight of the polymeric wall. The polymeric wall can comprise from about 5% to about 100%, preferably from about 40% to about 100%, more preferably from about 50% to about 100%, more preferably from about 75% to about 100%, more preferably from about 85% to about 100%, more preferably from about 90% to about 100%, even more preferably from about 95% to about 100%, of the oil-soluble or oil-dispersible multifunctional (meth)acrylate monomers or oligomers, by weight of the polymeric wall. The (meth)acrylate polymer can comprise from about 5% to about 100%, preferably from about 40% to about 100%, more preferably from about 50% to about 100%, more preferably from about 75% to about 100%, more preferably from about 85% to about 100%, more preferably from about 90% to about 100%, even more preferably from about 95% to about 100%, of the oil-soluble or oil-dispersible multifunctional (meth)acrylate monomers or oligomers, by weight of the (meth)acrylate polymer.

[0061] The one or more oil-soluble or oil-dispersible multifunctional (meth)acrylate monomers or oligomers comprise at least three, preferably at least four, preferably at least five, preferably at least six, more preferably exactly six, free-radically polymerizable functional groups, with the proviso that at least one of the free-radically polymerizable functional groups is an acrylate or methacrylate group.

[0062] The one or more oil-soluble or oil-dispersible multifunctional (meth)acrylate monomers or oligomers can comprise from three to six, preferably from four to six, more preferably from five to six, most preferably exactly six, free-radically polymerizable functional groups. It is believed that monomers comprising a relatively high number of free-radically polymerizable groups yield, for example, delivery particles having denser walls and having preferred properties such as less leakage, as compared to walls formed from monomers having fewer free-radically polymerizable groups.

[0063] The free-radically polymerizable functional groups can independently be selected from the group consisting of an acrylate, a methacrylate, a styrene, an allyl, a vinyl, a glycidyl, an ether, an epoxy, a carboxyl, or a hydroxyl, provided that at least one of the free-radically polymerizable functional groups in the free-radically polymerizable group is an acrylate or a methacrylate. Preferably, at least two, or at least three, or at least four, or at least five, or at least six of the free-radically polymerizable functional groups are acrylate or methacrylate groups. Preferably, the free-radically polymerizable functional groups are each independently selected from the group consisting of an acrylate and a methacrylate. It is believed that these functional groups result in the delivery particles having preferred properties, such as less leakage at high core:wall ratios compared to other functional groups.

[0064] The oil-soluble or oil-dispersible multifunctional (meth)acrylate monomer or oligomer can comprise a multifunctional aromatic urethane acrylate. Preferably, the oil-soluble or oil-dispersible multifunctional (meth)acrylate monomer or oligomer comprises a hexafunctional aromatic urethane acrylate.

[0065] Additionally or alternatively, the oil-soluble or oil-dispersible multifunctional (meth)acrylate monomer or oligomer can comprise a multifunctional aliphatic urethane acrylate.

[0066] The (meth)acrylate polymer of the polymeric wall can be derived from at least two different multifunctional (meth)acrylate monomers, for example a first multifunctional (meth)acrylate monomer and a second multifunctional (meth)acrylate monomer, which can each preferably be oil-soluble or oil-dispersible. The first multifunctional (meth)acrylate monomer can comprise a different number of free-radically polymerizable functional groups compared to the second multifunctional (meth)acrylate monomer. For example, the first multifunctional (meth)acrylate monomer can comprise six free-radically polymerizable functional groups (e.g., hexafunctional), and the second multifunctional (meth)acrylate monomer can comprise fewer than six free-radically polymerizable functional groups, such as a number selected from three (e.g., trifunctional), four (e.g., tetrafunctional), or five (e.g., pentafunctional), preferably five. The first multifunctional (meth)acrylate monomer and the second multifunctional (meth)acrylate monomer can comprise the same number of free-radically polymerizable functional groups, such as six (e.g., both monomers are hexafunctional), but the respective monomers are characterized by different structures or chemical properties.

[0067] The oil-soluble or oil-dispersible (meth)acrylate can also include a monomer selected from an amine methacrylate, an acidic methacrylate, or a combination thereof.

[0068] The (meth)acrylate polymer of the polymer wall can be a reaction product derived from an oil-soluble or oil-dispersible multifunctional (meth)acrylate, a second monomer, and a third monomer. Preferably, the second monomer includes a basic (meth)acrylate monomer, and the third monomer includes an acidic (meth)acrylate monomer. The basic (meth)acrylate monomer or oligomer can be present in less than 2% by weight of the wall polymer. The acidic (meth)acrylate monomer or oligomer can be present in less than 2% by weight of the wall polymer.

[0069] The basic (meth)acrylate monomer and / or oligomer or prepolymer thereof can include one or more of an amine-modified methacrylate, an amine-modified acrylate, a monomer such as a mono- or di-acrylate amine or a mono- or di-methacrylate amine, an amine-modified polyether acrylate, an amine-modified polyether methacrylate, an aminoalkyl acrylate, or an aminoalkyl methacrylate. The amine can be a primary, secondary, or tertiary amine. Preferably, the alkyl portion of the basic (meth)acrylate monomer is Ci to C12.

[0070] The amine (meth)acrylate suitable for use in the particles of the present disclosure can include an aminoalkyl acrylate or aminoalkyl methacrylate, including, for example, but not limited to, ethylaminoethyl acrylate, ethylaminoethyl methacrylate, aminoethyl acrylate, aminoethyl methacrylate, t-butylethylamino acrylate, t-butylethylamino methacrylate, t-butylaminoethyl acrylate, t-butylaminoethyl methacrylate, diethylamino acrylate, diethylamino methacrylate, diethylaminoethyl acrylate, diethylaminoethyl methacrylate, dimethylaminoethyl acrylate, and dimethylaminoethyl methacrylate. Preferably, the amine (meth)acrylate is aminoethyl acrylate or aminoethyl methacrylate, or t-butylaminoethyl methacrylate.

[0071] The acidic (meth)acrylate can include one or more of a carboxy-substituted acrylate or methacrylate, preferably a carboxy-substituted alkyl acrylate or methacrylate, such as a carboxyalkyl acrylate, carboxyalkyl methacrylate, carboxyaryl acrylate, carboxyaryl methacrylate, and preferably the alkyl portion is a linear or branched Ci to C10. The carboxy portion can be bonded to any carbon of the Ci to C10 alkyl portion, preferably a terminal carbon. Carboxy-substituted aryl acrylates or methacrylates, or even (meth)acryloyloxyphenylalkyl carboxylic acids can also be used. The alkyl portion of the (meth)acryloyloxyphenylalkyl carboxylic acid can be Ci to C10.

[0072] Carboxylic (meth)acrylates suitable for use in the particles of the present disclosure can include 2-carboxyethyl acrylate, 2-carboxyethyl methacrylate, 2-carboxypropyl acrylate, 2-carboxypropyl methacrylate, carboxyoctyl acrylate, carboxyoctyl methacrylate. Carboxy-substituted aryl acrylates or methacrylates can include 2-acryloyloxybenzoic acid, 3-acryloyloxybenzoic acid, 4-acryloyloxybenzoic acid, 2-methacryloyloxybenzoic acid, 3-methacryloyloxybenzoic acid, and 4-methacryloyloxybenzoic acid. For example, (meth)acryloyloxyphenyl alkyl carboxylic acids can include, but are not limited to, 4-acryloyloxyphenyl acetic acid or 4-methacryloyloxyphenyl acetic acid.

[0073] In addition to the oil-soluble or oil-dispersible multifunctional (meth)acrylate monomers or oligomers, the (meth)acrylate polymer of the polymeric wall can also be derived from water-soluble or water-dispersible monofunctional or multifunctional (meth)acrylate monomers or oligomers, which can include hydrophilic functional groups. The water-soluble or water-dispersible monofunctional or multifunctional (meth)acrylate monomers or oligomers can be preferably selected from the group consisting of amine (meth)acrylates, acidic (meth)acrylates, polyethylene glycol di(meth)acrylates, ethoxylated monofunctional (meth)acrylates, ethoxylated multifunctional (meth)acrylates, other (meth)acrylate monomers, other (meth)acrylate oligomers, and mixtures thereof. An emulsifier can be optionally included, preferably in the aqueous phase, when preparing the delivery particles. The emulsifier can be a polymeric emulsifier. The emulsifier can help to further stabilize the emulsion. The polymeric emulsifier can be entrapped in the polymeric wall material in the formation of the polymeric wall of the delivery particle. The inclusion of the emulsifier in the polymeric wall can be used to advantageously modify the properties of the polymeric wall, affecting attributes such as flexibility, leakage, strength, and other properties. Thus, the polymeric wall of the delivery particle can also include a polymeric emulsifier entrapped in the polymeric wall, preferably wherein the polymeric emulsifier comprises polyvinyl alcohol. However, as noted above, the entrapped polymeric emulsifier is not included when determining the core:wall polymer weight ratio.

[0074] Based on the weight of the wall material, the benefit agent delivery particle can comprise from about 0.5% to about 40%, preferably from about 0.5% to about 20%, more preferably 0.8% to 5% of an emulsifying agent. Preferably, the emulsifying agent is selected from the group consisting of polyvinyl alcohol, carboxylated or partially hydrolyzed polyvinyl alcohol, methyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, methylhydroxypropyl cellulose, salts or esters of stearic acid, lecithin, organic sulfonic acids, 2-acrylamido-2-alkylsulfonic acids, styrene sulfonic acid, polyvinylpyrrolidone, copolymers of N-vinylpyrrolidone, polyacrylic acid, polymethacrylic acid; copolymers of acrylic acid and methacrylic acid, and water-soluble surfactant polymers that reduce the surface tension of water. The emulsifying agent preferably comprises polyvinyl alcohol, and the polyvinyl alcohol preferably has a degree of hydrolysis of from about 55% to about 99%, preferably from about 75% to about 95%, more preferably from about 85% to about 90%, and most preferably from about 87% to about 89%. The polyvinyl alcohol can have a viscosity in a 4% polyvinyl alcohol aqueous solution at 20°C of from about 40 cps to about 80 cps, preferably from about 45 cps to about 72 cps, more preferably from about 45 cps to about 60 cps, and most preferably 45 cps to 55 cps; the viscosity of the polymer is determined by measuring a freshly made solution using a Brookfield LV type viscometer with UL adapter as described in British Standard EN ISO 15023-2:2006 Annex E Brookfield test method. The polyvinyl alcohol can have a degree of polymerization of from about 1500 to about 2500, preferably from about 1600 to about 2200, more preferably from about 1600 to about 1900, and most preferably from about 1600 to about 1800. The polyvinyl alcohol can have a weight average molecular weight of from about 130,000 Daltons to about 204,000 Daltons, preferably from about 146,000 Daltons to about 186,000 Daltons, more preferably from about 146,000 Daltons to about 160,000 Daltons, and most preferably from about 146,000 Daltons to about 155,000 Daltons, and / or a number average molecular weight of from about 65,000 Daltons to about 110,000 Daltons, preferably from about 70,000 Daltons to about 101,000 Daltons, more preferably from about 70,000 Daltons to about 90,000 Daltons, and most preferably from about 70,000 Daltons to about 80,000 Daltons.

[0075] The (meth)acrylate polymer of the polymeric wall can be derived at least in part further from at least one free radical initiator, preferably at least two free radical initiators. The at least one free radical initiator can preferably comprise a water-soluble or water-dispersible free radical initiator. The one or more free radical initiators can provide a source of free radicals upon activation.

[0076] Without wishing to be bound by theory, it is believed that selecting the appropriate amount of initiator relative to the total wall material (and / or wall monomer / oligomer) can result in improved capsules. For example, it is believed that too low a level of initiator can result in poor polymer wall formation; too high a level can result in encapsulate walls with relatively low levels of structural monomer. In either case, the resulting capsules can be relatively leaky and / or weak. It is further believed that, given that the amount of wall material is relatively low, optimization of encapsulate wall formation aided by appropriate selection of the relative initiator level is particularly important for capsules having a relatively high core:wall ratio.

[0077] Accordingly, the amount of initiator present can be from about 2% to about 50%, preferably from about 5% to about 40%, more preferably from about 10% to about 40%, even more preferably from about 15% to about 40%, even more preferably from about 20% to about 35%, or more preferably from about 20% to about 30% by weight of the polymer wall (e.g., wall monomers plus initiator, excluding entrapped polymer emulsifiers, as described herein for the core:wall ratio). It is believed that relatively high amounts of initiator within the disclosed ranges can result in improved, less leaky capsules. The optimal amount of initiator can vary depending on the properties of the core material. The (meth)acrylate polymer of the polymer wall can be derived from a first initiator and a second initiator, wherein the first initiator and the second initiator are present in a weight ratio of from about 5: 1 to about 1 :5, or preferably from about 3: 1 to about 1 :3, or more preferably from about 2: 1 to about 1 :2, or even more preferably from about 1.5: 1 to about 1 : 1.5.

[0078] Suitable free radical initiators can include peroxygen initiators, azo initiators, peroxides, and compounds such as 2,2'-azobis methylbutyronitrile, dibenzoyl peroxide. More specifically and without limitation, the free radical initiator can be selected from the group of initiators including azo or peroxygen initiators such as peroxides, dialkyl peroxides, alkyl peroxides, peroxy esters, peroxy carbonates, peroxy ketones and peroxy dicarbonates, 2,2'-azobis(isobutyronitrile), 2,2'-azobis(2,4-dimethylvaleronitrile), 2,2'-azobis(2,4-dimethylvaleronitrile), 2,2'-azobis(2-methylpropionitrile), 2,2'-azobis(2-methylbutyronitrile), 1,1 '-azobis(cyclohexanecarbonitrile), benzoyl peroxide, decanoyl peroxide; lauroyl peroxide; benzoyl peroxide, di(n-propyl) peroxydicarbonate, di(sec-butyl) peroxydicarbonate, di(2- ethylhexyl) peroxydicarbonate, 1,1 -dimethyl-3-hydroxybutyl peroxyneodecanoate, a- cumyl peroxyneohexanoate, t-amyl peroxyneodecanoate, t-butyl peroxyneodecanoate, t-amyl peroxyneopentanoate, t-butyl peroxyneopentanoate, 2,5-dimethyl 2,5-di(2- ethylhexanoylperoxy)hexane, t-amyl peroxy-2-ethylhexanoate, t-butyl peroxy-2- ethylhexanoate, t-butyl peroxyacetate, di-t-amyl peroxyacetate, t-butyl hydroperoxide, di-t-amyl hydroperoxide, 2,5-dimethyl-2,5-di-(t-butylperoxy)-3-hexyne, cumene hydroperoxide, 1,1 -di-(t-butylperoxy)-3,3,5-trimethyl-cyclohexane, 1,1 -di-(t- butylperoxy)-cyclohexane, 1,1 -di-(t-amylperoxy)-cyclohexane, ethyl-3,3-di-(t- butylperoxy)-butyrate, t-amyl perbenzoate, t-butyl perbenzoate, ethyl 3,3-di-(t- amylperoxy)-butyrate, and the like.

[0079] The shell of the delivery particle can include a coating, for example, on the outer surface of the shell distal from the core. The enclosures can be manufactured and then coated with a coating material. The coating can function as a deposition aid. The coating can include a cationic material, such as a cationic polymer. However, as noted above, the coating, which is not a structural or support feature of the wall, is not included in the calculation when determining the core:wall polymer weight ratio.

[0080] Non-limiting examples of coating materials include, but are not limited to, materials selected from the group consisting of poly(meth)acrylates, poly(ethylene-maleic anhydride), polyamines, waxes, polyvinylpyrrolidone, polyvinylpyrrolidone copolymers, polyvinylpyrrolidone-ethyl acrylate, polyvinylpyrrolidone-vinyl acrylate, polyvinylpyrrolidone methacrylate, polyvinylpyrrolidone / vinyl acetate, polyvinyl acetal, polyvinyl butyral, polysiloxanes, poly(propylene maleic anhydride), maleic anhydride derivatives, copolymers of maleic anhydride derivatives, polyvinyl alcohol, styrene-butadiene latex, gelatin, gum arabic, carboxymethyl cellulose, carboxymethylhydroxyethyl cellulose, hydroxyethyl cellulose, other modified celluloses, sodium alginate, chitosan, casein, pectin, modified starch, polyvinyl acetal, polyvinyl butyral, polyvinyl methyl ether / maleic anhydride, polyvinylpyrrolidone and copolymers thereof, poly(vinylpyrrolidone / methylacrylamidopropyltrimethylammonium chloride), polyvinylpyrrolidone / vinyl acetate, polyvinylpyrrolidone / dimethylaminoethyl methacrylate, polyvinylamine, polyvinylformamide, polyallylamine, and copolymers of polyvinylamine, polyvinylformamide, and polyallylamine, and mixtures thereof. The coating material can be a cationic polymer. The coating material can include polyvinylformamide, chitosan, or a combination thereof, preferably chitosan.

[0081] b. Benefit agent

[0082] The delivery particles of the present disclosure include a core. The core can comprise a benefit agent. Suitable benefit agents located in the core can include benefit agents that provide a benefit to a surface, such as a fabric or hair.

[0083] The core can comprise from about 45% to about 95%, preferably from about 50% to about 80%, more preferably from about 50% to about 70%, by weight of the core, of a benefit agent, which can preferably be a fragrance.

[0084] The benefit agent can be selected from the group consisting of fragrances, silicone oils, waxes, hydrocarbons, higher fatty acids, essential oils, lubricants, lipids, skin cooling agents, vitamins, sunscreens, antioxidants, glycerin, catalysts, bleach particles, silica particles, malodor reducing agents, odor control materials, chelating agents, anti-static agents, softening agents, insect and moth repellents, colorants, antioxidants, chelating agents, base agents, sterile drapes and form control agents, smoothing agents, wrinkle control agents, sanitizing agents, disinfecting agents, microbial control agents, mold control agents, mildew control agents, anti-viral agents, drying agents, stain prevention agents, soil release agents, fabric freshening and freshness extending agents, chlorine bleach odor control agents, dye fixatives, dye transfer inhibitors, color maintenance agents, optical brighteners, color restoration / rejuvenation agents, anti-fading agents, whiteness enhancing agents, anti-abrasion agents, anti-wear agents, fabric integrity agents, anti-wear agents, anti-pilling agents, defoaming agents, antifoams, ultraviolet light protection agents, light fade inhibitors, anti-allergenic agents, enzymes, water proofing agents, fabric comfort agents, anti-shrinkage agents, anti-stretching agents, stretch recovery agents, skin care agents, glycerin, synthetic or natural actives, antibacterial actives, antiperspirant actives, cationic polymers, dyes, and mixtures thereof.

[0085] The encapsulated benefit agent can preferably be a fragrance, which can include one or more perfume raw materials. As used herein, the term "perfume raw material" (or "PRM") refers to a compound having a molecular weight of at least about 100 g / mol, and which can be used alone or with other perfume raw materials to impart an odor, aroma, fragrance, or scent. Typical PRMs include, among others, alcohols, ketones, aldehydes, esters, ethers, nitrites, and olefins, such as terpenes. A list of common PRMs can be found in various references, for example, "Perfume and Flavor Chemicals", Volumes I and II; Steffen Arctander Allured Pub. Co. (1994) and "Perfumes: Art, Science and Technology", Miller, P. M. and Lamparsky, D., Blackie Academic and Professional (1994).

[0086] PRMs can be characterized by their measured boiling point (B.P.) at normal pressure (760 mm Hg), and their octanol / water partition coefficient (P), which can be described in terms of log P, as determined according to the test methods below. Based on these characteristics, PRMs can be classified as first quadrant, second quadrant, third quadrant, or fourth quadrant fragrances, as described in more detail below.

[0087] The fragrance can include perfume raw materials having a log P of from about 2.5 to about 4. It should be understood that other perfume raw materials can also be present in the fragrance.

[0088] The perfume raw material can include a perfume raw material selected from the group consisting of perfume raw materials having a boiling point (B.P.) below about 250°C and a logP less than about 3, perfume raw materials having a B.P. above about 250°C and a logP greater than about 3, perfume raw materials having a B.P. above about 250°C and a logP less than about 3, perfume raw materials having a B.P. below about 250°C and a logP greater than about 3, and mixtures thereof. Perfume raw materials having a boiling point B.P. below about 250°C and a logP less than about 3 are referred to as first quadrant perfume raw materials. The first quadrant perfume raw materials are preferably limited to less than 30% of the perfume composition. Perfume raw materials having a B.P. above about 250°C and a logP greater than about 3 are referred to as fourth quadrant perfume raw materials, perfume raw materials having a B.P. above about 250°C and a logP less than about 3 are referred to as second quadrant perfume raw materials, and perfume raw materials having a B.P. below about 250°C and a logP greater than about 3 are referred to as third quadrant perfume raw materials. Suitable first, second, third, and fourth quadrant perfume raw materials are disclosed in U.S. Patent 6,869,923 Bl.

[0089] c. Partitioning modifier

[0090] The core of the delivery particle of the present disclosure can comprise a partitioning modifier. The nature of the oily material in the core can play a role in determining how much, how quickly, and / or how the polyacrylate shell material will permeate when formed at the oil / water interface. For example, if the oil phase comprises highly polar materials, these materials can reduce the diffusion of the acrylate oligomers and polymers to the oil / water interface and result in a very thin, highly permeable shell. Incorporation of a partitioning modifier can adjust the polarity of the core, thereby changing the partitioning coefficient of polar materials in the partitioning modifier relative to the acrylate oligomers, and can result in the formation of a distinct, highly impermeable shell. The partitioning modifier can be combined with the perfume oil material of the core prior to incorporation of the wall-forming monomers.

[0091] The partitioning modifier can be present in the core at a level of from about 5% to about 55%, preferably from about 10% to about 50%, more preferably from about 25% to about 50%, by weight of the core.

[0092] The partitioning modifier can include a material selected from the group consisting of vegetable oils, modified vegetable oils, C4-C 24monoesters, diesters, and triesters of fatty acids, isopropyl myristate, lauryl benzophenone, lauryl laurate, methyl behenate, methyl laurate, methyl palmitate, methyl stearate, and mixtures thereof. The partitioning modifier can preferably include or even consist of isopropyl myristate. The modified vegetable oil can be esterified and / or brominated. The modified vegetable oil can preferably include castor oil and / or soybean oil. U.S. Patent Application Publication 20110268802, incorporated herein by reference, describes other partitioning modifiers that can be used in the delivery particles described herein.

[0093] d. Method of making delivery particles

[0094] The delivery particles can be prepared according to known methods, so long as the core:shell ratios described herein are observed. The methods can be further adjusted to obtain other desired properties described herein, such as volume weighted particle size, relative amounts of benefit agent and / or partitioning modifier, etc.

[0095] For example, the present disclosure relates to a method of preparing a population of delivery particles comprising a core and a polymeric wall encapsulating the core. The method can include a step of providing an oil phase. The oil phase can comprise a benefit agent and a partitioning modifier, as described above. The method can also include dissolving or dispersing one or more oil-soluble or dispersible multifunctional (meth)acrylate monomers or oligomers into the oil phase, the multifunctional (meth)acrylate monomers or oligomers having at least three, preferably at least four, at least five, or even at least six, free-radically polymerizable functional groups, with the proviso that at least one of the free-radically polymerizable groups is an acrylate or methacrylate.

[0096] The oil-soluble or dispersible multifunctional (meth)acrylate monomers or oligomers are described in more detail above. Among others, the oil-soluble or dispersible multifunctional (meth)acrylate monomers or oligomers can comprise a multifunctional aromatic polyurethane acrylate, preferably a tri-functional aromatic polyurethane acrylate, a tetra-functional aromatic polyurethane acrylate, a penta-functional aromatic polyurethane acrylate, or a hexa-functional aromatic polyurethane acrylate, or mixtures thereof, preferably comprising a hexa-functional aromatic polyurethane acrylate. The monomers or oligomers can comprise one or more multifunctional aliphatic polyurethane acrylates, which can be dissolved or dispersed into the oil phase. The method can also include dissolving or dispersing one or more of an amine (meth)acrylate or an acidic (meth)acrylate into the oil phase.

[0097] The method can also include providing an aqueous phase, which can comprise an emulsifier, a surfactant, or a combination thereof. The method can also include a step of dissolving or dispersing one or more water-soluble or water-dispersible mono- or multifunctional (meth)acrylate monomers and / or oligomers into the aqueous phase.

[0098] The method can include the step of dissolving or dispersing one or more amine (meth)acrylates, acidic (meth)acrylates, polyethylene glycol di(meth)acrylates, ethoxylated mono- or polyfunctional (meth)acrylates, and / or other (meth)acrylate monomers and / or oligomers into the aqueous phase, the oil phase, or both.

[0099] Generally, oil-soluble polyfunctional (meth)acrylate monomers are soluble or dispersible in the oil phase, typically soluble to the extent of at least 1 gram in 100 ml of oil at 22°C, or dispersible or emulsifiable therein. Water-soluble polyfunctional (meth)acrylate monomers are typically soluble or dispersible in water, typically soluble to the extent of at least 1 gram in 100 ml of water at 22°C, or dispersible therein.

[0100] Typically, the oil phase is combined with an excess of the aqueous phase. If more than one oil phase is used, they are typically combined first and then combined with the aqueous phase. If desired, the aqueous phase can also comprise one or more sequentially combined aqueous phases.

[0101] The oil phase can be emulsified into the aqueous phase under high shear agitation to form an oil-in-water emulsion, which can comprise droplets of core material dispersed in the aqueous phase. Typically, the amount of shear agitation applied can be controlled to form droplets of a target size, which influences the final size of the finished encapsulates.

[0102] The dissolved or dispersed monomers can be reacted by heating or actinic radiation of the emulsion. The reaction can form a polymer wall at the interface of the droplet with the aqueous phase. The free-radically polymerizable groups of the polyfunctional methacrylate facilitate self-polymerization of the polyfunctional methacrylate upon heating.

[0103] One or more free-radical initiators can be provided to the oil phase, the aqueous phase, or both, preferably both. For example, the method can include adding one or more free-radical initiators to the aqueous phase, for example to provide an additional source of free radicals upon thermal activation. The method can include adding one or more free-radical initiators to the oil phase. One or more free-radical initiators can be added to the aqueous phase, the oil phase, or both, in an amount greater than 0% to about 5% by weight of the respective phase. Also contemplated are latent initiators, where a first action, in particular a chemical reaction, is required to convert the latent initiator into an active initiator, which subsequently initiates polymerization upon exposure to polymerization conditions. When multiple initiators are present, it is expected and preferred that each initiator is initiated by, or suitably initiated by, different conditions.

[0104] Alternatively, the reaction step can be conducted in the absence of an initiator, as it has been surprisingly discovered that encapsulates can form even when a free-radical initiator is not present.

[0105] In the method, the heating step can comprise heating the emulsion for about 1 hour to about 20 hours, preferably about 2 hours to about 15 hours, more preferably about 4 hours to about 10 hours, most preferably about 5 hours to about 7 hours, to sufficiently heat to transfer about 500 Joules per kilogram to about 5000 Joules per kilogram to the emulsion, about 1000 Joules per kilogram to about 4500 Joules per kilogram to the emulsion, about 2900 Joules per kilogram to about 4000 Joules per kilogram to the emulsion.

[0106] Prior to the heating step, the emulsion can be characterized by a volume weighted median particle size of the emulsion droplets of about 0.5 microns to about 100 microns, even about 1 micron to about 60 microns or even 20 microns to 50 microns, preferably about 30 microns to about 50 microns, with the intent to form a population of delivery particles having a volume weighted target size of, for example, about 30 microns to about 50 microns.

[0107] The benefit agent can be selected as described above, and is preferably a fragrance comprising one or more perfume raw materials. The benefit agent can be the primary component or even the only component of the oil phase in which other materials are dissolved or dispersed.

[0108] The partitioning modifier can be selected from the group consisting of isopropyl myristate, vegetable oil, modified vegetable oil, mono-, di-, and tri-esters of C4-C24fatty acids, lauryl phenyl ketone, lauryl laurate, methyl behenate, methyl laurate, methyl palmitate, methyl stearate, and mixtures thereof, preferably isopropyl myristate. The partitioning modifier can be provided in an amount of about 5% to about 55% by weight of the core of the delivery particle.

[0109] As described above, it is desirable for the resulting delivery particles to be characterized by a core:polymer wall weight of about 96:4 to about 99.5:0.5. It is also desirable for the resulting delivery particles to be characterized by a volume weighted median particle size of about 30 microns to about 50 microns.

[0110] As a result of the method of making delivery particles provided herein, the delivery particles can be present in an aqueous slurry, for example, the particles can be present in the slurry at a level of about 20% to about 60%, preferably about 30% to about 50% by weight of the slurry. Additional materials can be added to the slurry, such as a preservative, a solvent, a structurant, or other processing or stabilizing aids. The slurry can comprise one or more perfumes (i.e., unencapsulated perfumes) that are different from the one or more perfumes contained in the core of the benefit agent delivery particles.

[0111] An exemplary synthetic method by which encapsulates according to the present disclosure can be formed is further described in Example 1 below.

[0112] Consumer product adjunct material

[0113] The compositions of the present disclosure, which can be consumer products, can comprise consumer product adjunct materials. The consumer product adjunct materials can provide a benefit in the intended end use of the composition, or they can be process and / or stability aids.

[0114] Suitable consumer product adjunct materials can include: surfactants, conditioning actives, deposition aids, rheology modifiers or structurants, bleach system, stabilizers, builders, chelants, dye transfer inhibitors, dispersants, enzymes and enzyme stabilizers, catalytic metal complexes, polymeric dispersing agents, clay and soil removal / anti-redeposition agents, whitening agents, sudsing agents, silicones, hueing agents, aesthetic dyes, additional perfumes and perfume delivery systems, structure elasticizing agents, carriers, hydrotropes, processing aids, structurants, anti-agglomeration agents, coatings, formaldehyde scavengers, and / or pigments.

[0115] The compositions of the present disclosure can not comprise one or more of the following adjunct materials depending on the intended form, formulation, and / or end use: bleach activators, surfactants, builders, chelants, dye transfer inhibitors, dispersants, enzymes and enzyme stabilizers, catalytic metal complexes, polymeric dispersing agents, clay and soil removal / anti-redeposition agents, whitening agents, sudsing agents, dyes, additional perfumes and perfume delivery systems, structure elasticizing agents, fabric softening agents, carriers, hydrotropes, processing aids, structurants, anti-agglomeration agents, coatings, formaldehyde scavengers, and / or pigments.

[0116] The explicit nature of these additional components and their level of incorporation will depend on the physical form of the composition as well as the nature of the operation for which it is used. However, when one or more adjuncts are present, such one or more adjuncts can be present as detailed below. The following is a non-limiting list of suitable additional adjuncts.

[0117] a. Surfactant

[0118] The compositions of the present disclosure can comprise a surfactant. For example, a surfactant can be used to provide a cleaning benefit. The composition can comprise a surfactant system, which can comprise one or more surfactants.

[0119] The compositions of the present disclosure can comprise from about 0.1% to about 70%, or from about 2% to about 60%, or from about 5% to about 50%, by weight of the composition, of a surfactant system. Liquid compositions can comprise from about 5% to about 40%, by weight of the composition, of a surfactant system. Dense formulations, including dense liquids, gels, and / or compositions suitable for unit dose forms, can comprise from about 25% to about 70%, or from about 30% to about 50%, by weight of the composition, of a surfactant system.

[0120] The surfactant system can include anionic surfactants, nonionic surfactants, zwitterionic surfactants, cationic surfactants, amphoteric surfactants, or combinations thereof. The surfactant system can include linear alkyl benzene sulfonate, alkyl ethoxylated sulfate, alkyl sulfate, nonionic surfactants such as ethoxylated alcohols, amine oxides, or mixtures thereof. The surfactant can be derived at least in part from natural sources, such as natural feedstock alcohols.

[0121] Suitable anionic surfactants can include any conventional anionic surfactant. This can include sulfate detersive surfactants (e.g., alkoxylated and / or non-alkoxylated alkyl sulfate materials) and / or sulfonic detersive surfactants (e.g., alkyl benzene sulfonate). The anionic surfactant can be linear, branched, or a combination thereof. Preferred surfactants include linear alkyl benzene sulfonate (LAS), alkyl ethoxylated sulfate (AES), alkyl sulfate (AS), or mixtures thereof. Other suitable anionic surfactants include branched modified alkyl benzene sulfonate (MLAS), methyl ester sulfonate (MES), sodium lauryl sulfate (SLS), sodium lauryl ether sulfate (SLES), and / or alkyl ethoxylated carboxylate (AEC). The anionic surfactant can be present in acid form, salt form, or a mixture thereof. The anionic surfactant can be partially or fully neutralized, e.g., by an alkali metal (e.g., sodium) or an amine (e.g., monoethanolamine).

[0122] The surfactant system can include nonionic surfactants. Suitable nonionic surfactants include alkoxylated fatty alcohols, such as ethoxylated fatty alcohols. Other suitable nonionic surfactants include alkoxylated alkyl phenols, alkyl phenol condensates, mid-chain branched alcohols, mid-chain branched alkyl alkoxylates, alkyl polysaccharides (e.g., alkyl polyglycosides), polyhydroxy fatty acid amides, ether capped poly(alkoxylated) alcohol surfactants, and mixtures thereof. The alkoxylate units can be ethyleneoxy units, propyleneoxy units, or mixtures thereof. The nonionic surfactant can be linear, branched (e.g., mid-chain branched), or a combination thereof. A specific nonionic surfactant can include an alcohol having an average of about 12 to about 16 carbon atoms and an average of about 3 to about 9 ethoxy groups, such as a C12-C14EO7 nonionic surfactant.

[0123] Suitable zwitterionic surfactants can include any conventional zwitterionic surfactant, such as betaines, including alkyl dimethyl betaines and coco dimethyl amido propyl betaines, C8 to C 18 (e.g., C 12 to C 18 ) amine oxides (e.g., C 12-14dimethyl amine oxide), and / or sulfobetaines and hydroxybetaines, such as N-alkyl-N,N-dimethylamino-1-propane sulfonate where the alkyl group can be C8 to C 18 or C 10 to C 14 Zwitterionic surfactants can include amine oxides.

[0124] The composition can be essentially free of certain surfactants depending on the formulation and / or intended end use. For example, liquid fabric enhancer compositions, such as fabric softeners, can be essentially free of anionic surfactants as such surfactants can undesirably interact with cationic ingredients.

[0125] b. Conditioning active

[0126] The compositions of the present disclosure can comprise a conditioning active. Compositions comprising a conditioning active can provide softness, anti-wrinkle, anti-static, conditioning, anti-stretch, color and / or appearance benefits.

[0127] The conditioning active can be present at a level of from about 1% to about 99% by weight of the composition. The composition can comprise from about 1%, or about 2%, or about 3% to about 99%, or to about 75%, or to about 50%, or to about 40%, or to about 35%, or to about 30%, or to about 25%, or to about 20%, or to about 15%, or to about 10% by weight of the composition of the conditioning active. The composition can comprise from about 5% to about 30% by weight of the composition of the conditioning active.

[0128] Suitable conditioning actives for use in the compositions of the present disclosure can include quaternary ammonium ester compounds, silicones, non-ester quaternary ammonium compounds, amines, fatty esters, sucrose esters, silicones, dispersible polyolefins, polysaccharides, fatty acids, softening or conditioning oils, polymer latices, or combinations thereof.

[0129] The composition can comprise a quaternary ammonium ester compound, a silicone, or a combination thereof, preferably a combination. The total amount of the combination of quaternary ammonium ester compound and silicone can be from about 5% to about 70%, or from about 6% to about 50%, or from about 7% to about 40%, or from about 10% to about 30%, or from about 15% to about 25% by weight of the composition. The composition can comprise a quaternary ammonium ester compound and a silicone in a weight ratio of from about 1:10 to about 10:1, or from about 1:5 to about 5:1, or from about 1:3 to about 1:3, or from about 1:2 to about 2:1, or from about 1:1.5 to about 1.5:1, or about 1:1.

[0130] The composition can comprise a mixture of different types of conditioning active. The compositions of the present disclosure can comprise certain conditioning actives, but are essentially free of other conditioning actives. For example, the composition can be free of quaternary ammonium ester compounds, silicones, or both. The composition can comprise quaternary ammonium ester compounds, but is essentially free of silicones. The composition can comprise silicones, but is essentially free of quaternary ammonium ester compounds.

[0131] c. Deposition aid

[0132] The compositions of the present disclosure can comprise a deposition aid. The deposition aid can facilitate the deposition of the benefit agent, the conditioning active, the perfume, or a combination thereof, thereby improving the performance benefits of the composition and / or allowing for more efficient formulation of such benefit agents. The composition can comprise from 0.0001% to 3%, preferably from 0.0005% to 2%, more preferably from 0.001% to 1%, or from about 0.01% to about 0.5%, or from about 0.05% to about 0.3%, by weight of the composition, of the deposition aid. The deposition aid can be a cationic polymer or an amphoteric polymer, preferably a cationic polymer.

[0133] In general, cationic polymers and methods of making them are known in the literature. Suitable cationic polymers can include quaternary ammonium polymers known as "polyquaternium" polymers, as designated by the International Nomenclature for Cosmetic Ingredients, such as polyquaternium-6 (poly(diallyldimethylammonium chloride)), polyquaternium-7 (copolymer of acrylamide and diallyldimethylammonium chloride), polyquaternium-10 (quaternized hydroxyethyl cellulose), polyquaternium-22 (copolymer of acrylic acid and diallyldimethylammonium chloride), and the like.

[0134] The deposition aid can be selected from the group consisting of polyvinyl formamide, partially hydroxylated polyvinyl formamide, polyvinyl amine, polyvinyl imine, ethoxylated polyvinyl imine, polyvinyl alcohol, polyacrylate, and combinations thereof. The cationic polymer can include a cationic acrylate.

[0135] The deposition aid can be added to the consumer product composition simultaneously with (e.g., simultaneously with the encapsulated benefit agent) or directly / independently of the delivery particle. The weight average molecular weight of the polymer can be from 500 Daltons to 5000000 Daltons, or from 1000 Daltons to 2000000 Daltons, or from 2500 Daltons to 1500000 Daltons, as measured by size exclusion chromatography against a polyethylene oxide standard, as detected using refractive index (RI) detection. The weight average molecular weight of the cationic polymer can be from 5000 Daltons to 37500 Daltons.

[0136] d. Rheology modifier / Structurant

[0137] The compositions of the present disclosure can comprise a rheology modifier and / or a structurant. Rheology modifiers can be used to "thicken" or "thin" a liquid composition to a desired viscosity. Structurants can be used to promote phase stability and / or suspend or inhibit the aggregation of particles in a liquid composition, such as the delivery particles as described herein.

[0138] Suitable rheology modifiers and / or structurants can include non-polymeric crystalline hydroxyl-functional structurants (including those based on hydrogenated castor oil), polymeric structurants, cellulosic fibers (e.g., microfibrillated cellulose, which can be derived from bacterial, fungal, or plant sources, including from wood), diacyl amido gellants, or combinations thereof.

[0139] Polymeric structuring agents can be of natural or synthetic origin. Natural-derived polymeric structurants can include: hydroxyethyl cellulose, hydrophobically modified hydroxyethyl cellulose, carboxymethyl cellulose, polysaccharide derivatives, and mixtures thereof. Polysaccharide derivatives can include: pectin, alginate, arabinogalactan (gum arabic), carrageenan, gellan gum, xanthan gum, guar gum, and mixtures thereof. Synthetic polymeric structurants can include: polycarboxylates, polyacrylates, hydrophobically modified ethoxylated polyurethanes, hydrophobically modified non-ionic polyols, and mixtures thereof. Polycarboxylate polymers can include polyacrylates, polymethacrylates, or mixtures thereof. Polyacrylates can include copolymers of unsaturated mono- or di-carboxylic acids with C1-C30 alkyl esters of (meth)acrylic acid. Such copolymers can be purchased from Noveon under the trade name Carbopol Aqua 30. Another suitable structurant is sold under the trade name Rheovis CDE from BASF. 30 Suitable rheology modifiers and / or structurants can include non-polymeric crystalline hydroxyl-functional structurants (including those based on hydrogenated castor oil), polymeric structurants, cellulosic fibers (e.g., microfibrillated cellulose, which can be derived from bacterial, fungal, or plant sources, including from wood), diacyl amido gellants, or combinations thereof.

[0140] Method of making a composition

[0141] The present disclosure relates to methods of making any of the compositions described herein. The method of making a composition (which can be a consumer product) can comprise the step of combining the delivery particles as described herein with a consumer product adjunct material as described herein.

[0142] When the delivery particles are in one or more forms (including a slurry form, a neat delivery particle form, and / or a spray-dried delivery particle form), the delivery particles can be combined with such one or more consumer product adjunct materials. The delivery particles can be combined with such consumer product adjunct materials by methods including mixing and / or spraying.

[0143] The compositions of the present disclosure can be formulated into any suitable form and prepared by any method selected by the formulator. The delivery particles and adjunct materials can be combined in batch processes, in recirculating loop processes, and / or by in-line mixing processes. Suitable equipment for use in the processes disclosed herein can include continuous stirred tank reactors, homogenizers, turbo mixers, recirculation pumps, paddle mixers, high shear mixers, static mixers, plow shear mixers, ribbon blenders, vertical axis granulators and tumble mixers (both in batch and continuous process configurations when available), spray dryers, and extruders.

[0144] Method of treating a surface or article

[0145] The present disclosure also relates to methods of treating a surface or article with the compositions according to the present disclosure. Such methods can provide cleaning, conditioning, and / or freshening benefits.

[0146] Suitable surfaces or articles can include fabric (including clothing, towels, or linens), hard surfaces (such as tile, china, linoleum, or wood floors), dishes, hair, skin, or mixtures thereof.

[0147] The method can include the step of contacting the surface or article with a composition of the present disclosure. The composition can be neat or diluted in a liquid, such as a wash or rinse liquid. The composition can be diluted in water before, during, or after contacting the surface or article. The surface or article can be optionally washed and / or rinsed before and / or after the contacting step.

[0148] The method of treating and / or cleaning a surface or article can include the steps of:

[0149] a) optionally washing, rinsing, and / or drying the surface or article;

[0150] b) optionally contacting the surface or article with a composition as described herein in the presence of water;

[0151] c) optionally washing and / or rinsing the surface or article; and

[0152] d) optionally drying by passive drying and / or via an active method such as a laundry dryer.

[0153] For purposes of the present invention, washing includes but is not limited to scrubbing and mechanical agitation. The fabric can comprise most any fabric capable of being washed or treated under normal consumer use conditions.

[0154] The liquids which can comprise the disclosed compositions can have a pH of from about 3 to about 11.5. Such compositions are typically used at concentrations of from about 500 ppm to about 15,000 ppm in solution when diluted. When the wash solvent is water, the water temperature typically ranges from about 5 °C to about 90 °C, and when the situs comprises fabric, the water to fabric ratio is typically from about 1 : 1 to about 30: 1.

[0155] Combination

[0156] Specific contemplated combinations of the present disclosure are described herein in the following paragraphs denoted by letters. These combinations are exemplary in nature, and are not limiting.

[0157] A. A consumer product composition comprising: a treatment adjunct and a delivery particle population, wherein the delivery particle comprises a core and a polymeric wall surrounding the core, wherein the core comprises a benefit agent and a partitioning modifier, wherein the partitioning modifier is present in the core at a level of from about 5% to about 55% by weight of the core, wherein the polymeric wall comprises a (meth)acrylate polymer derived at least in part from one or more oil-soluble or oil-dispersible multifunctional (meth)acrylate monomers or oligomers having at least three free-radically polymerizable functional groups, with the proviso that at least one of the free-radically polymerizable groups is an acrylate or methacrylate; wherein the core and the polymeric wall are present in a weight ratio of from about 96:4 to about 99.5:0.5; and wherein the delivery particle is characterized by a volume-weighted median particle size of from 30 microns to 50 microns.

[0158] B. The consumer product composition according to paragraph A, wherein the delivery particle comprises the core and the polymeric wall present in a weight ratio of from about 97:3 to about 99: 1, more preferably from about 98:2 to about 99: 1.

[0159] C. The consumer product composition according to any of paragraphs A or B, wherein the one or more oil-soluble or oil-dispersible multifunctional (meth)acrylate monomers or oligomers comprise at least four, preferably at least five, more preferably at least six, even more preferably exactly six free-radically polymerizable functional groups.

[0160] D. The consumer product composition according to any of paragraphs A to C, wherein the free-radically polymerizable functional groups are each independently selected from the group consisting of acrylate and methacrylate.

[0161] E. The consumer product composition of any of paragraphs A to D, wherein the oil-soluble or oil-dispersible multifunctional (meth)acrylate monomer or oligomer comprises a multifunctional aromatic urethane acrylate.

[0162] F. The consumer product composition of any of paragraphs A to E, wherein the oil-soluble or oil-dispersible multifunctional (meth)acrylate monomer or oligomer comprises a hexafunctional aromatic urethane acrylate.

[0163] G. The consumer product composition of any of paragraphs A to F, wherein the oil-soluble or oil-dispersible multifunctional (meth)acrylate monomer or oligomer comprises a multifunctional aliphatic urethane acrylate.

[0164] H. The consumer product composition of any of paragraphs A to G, wherein the (meth)acrylate polymer is at least partially further derived from a monomer selected from an amine methacrylate, an acidic methacrylate, or a combination thereof.

[0165] I. The consumer product composition of any of paragraphs A to H, wherein the (meth)acrylate polymer of the polymeric wall is a reaction product derived from the oil-soluble or oil-dispersible multifunctional (meth)acrylate, a second monomer, and a third monomer, preferably wherein the second monomer comprises a basic (meth)acrylate monomer, and wherein the third monomer comprises an acidic (meth)acrylate monomer.

[0166] J. The consumer product composition of any of paragraphs A to I, wherein the (meth)acrylate polymer of the polymeric wall is further derived from a water-soluble or water-dispersible mono- or polyfunctional (meth)acrylate monomer or oligomer, preferably selected from the group consisting of an amine (meth)acrylate, an acidic (meth)acrylate, a polyethylene glycol di(meth)acrylate, an ethoxylated mono-functional (meth)acrylate, an ethoxylated polyfunctional (meth)acrylate, other (meth)acrylate monomers, other (meth)acrylate oligomers, and mixtures thereof.

[0167] K. The consumer product composition of any of paragraphs A to J, wherein the polymeric wall of the delivery particle further comprises a polymeric emulsifier entrapped in the polymeric wall, preferably wherein the polymeric emulsifier comprises a polyvinyl alcohol.

[0168] L. The consumer product composition of any of paragraphs A to K, wherein the (meth)acrylate polymer of the polymeric wall is at least partially further derived from at least one free radical initiator, preferably wherein the at least one free radical initiator comprises a water-soluble or water-dispersible free radical initiator, more preferably wherein the at least one free radical initiator comprises a water-soluble or water-dispersible free radical initiator and an oil-soluble or oil-dispersible free radical initiator.

[0169] M. The consumer product composition of any of paragraphs A to L, wherein the free radical initiator is present in an amount of from about 2% to about 50%, preferably from about 5% to about 40%, more preferably from about 10% to about 40%, even more preferably from about 15% to about 40%, even more preferably from about 20% to about 35%, or more preferably from about 20% to about 30%, by weight of the polymeric wall.

[0170] N. The consumer product composition of any of paragraphs A to M, wherein the benefit agent is a fragrance, preferably a fragrance comprising a perfume raw material characterized by a logP of from about 2.5 to about 4.

[0171] O. The consumer product composition of any of paragraphs A to N, wherein the partitioning modifier is selected from the group consisting of isopropyl myristate, vegetable oil, modified vegetable oil, mono-, di-, and tri-esters of C4-C24fatty acids, lauryl benzophenone, lauryl laurate, methyl behenate, methyl laurate, methyl palmitate, methyl stearate, and mixtures thereof, preferably isopropyl myristate.

[0172] P. The consumer product composition of any of paragraphs A to O, wherein the population of delivery particles is characterized by an average break strength of from about 0.2 MPa to about 10 MPa, preferably from about 0.5 MPa to about 8 MPa, more preferably from about 0.5 MPa to about 5 MPa.

[0173] Q. The consumer product composition of any of paragraphs A through P, wherein the polymeric wall of the delivery particle further comprises a coating material, preferably wherein the coating material is selected from the group consisting of poly(meth)acrylates, poly(ethylene-maleic anhydride), polyamines, waxes, polyvinylpyrrolidone, polyvinylpyrrolidone copolymers, polyvinylpyrrolidone-ethyl acrylate, polyvinylpyrrolidone-vinyl acrylate, polyvinylpyrrolidone-methacrylate, polyvinylpyrrolidone / vinyl acetate, polyvinyl acetal; polyvinyl butyral, polysiloxanes, poly(propylene maleic anhydride), maleic anhydride derivatives, copolymers of maleic anhydride derivatives, polyvinyl alcohol, styrene-butadiene latex, gelatin, gum arabic, carboxymethyl cellulose, carboxymethylhydroxyethyl cellulose, hydroxyethyl cellulose, other modified celluloses, sodium alginate, chitosan, casein, pectin, modified starches, polyvinyl acetal, polyvinyl butyral, polyvinyl methyl ether / maleic anhydride, polyvinylpyrrolidone and copolymers thereof, poly(vinylpyrrolidone / methyl methacrylamidopropyl trimethylammonium chloride), polyvinylpyrrolidone / vinyl acetate, polyvinylpyrrolidone / dimethylaminoethyl methacrylate, polyvinyl amines, polyvinyl formamides, polyallyl amines, copolymers of polyvinyl amines, and mixtures thereof.

[0174] R. The consumer product composition of any of paragraphs A through Q, wherein the delivery particle is characterized by a volume weighted median particle size of from about 30 microns to about 40 microns.

[0175] S. The consumer product composition of any of paragraphs A through R, wherein the composition further comprises from about 0.05% to about 20%, preferably from about 0.05% to about 10%, more preferably from about 0.1% to about 5%, even more preferably from about 0.2% to about 2%, by weight of the composition, of the delivery particle.

[0176] T. The consumer product composition of any of paragraphs A through S, wherein the processing aid is selected from the group consisting of surfactants, conditioning actives, deposition aids, rheology modifiers or structurants, bleach systems, stabilizers, builders, chelants, dye transfer inhibitors, dispersants, enzymes, enzyme stabilizers, catalytic metal complexes, polymeric dispersing agents, clay and soil removal / anti-redeposition agents, whitening agents, suds suppressors, silicones, hueing agents, aesthetic dyes, neat perfumes, additional perfume delivery systems, structure elasticizing agents, carriers, hydrotropes, processing aids, anti-agglomeration agents, coatings, formaldehyde scavengers, pigments, and mixtures thereof.

[0177] U. The consumer product composition according to any of paragraphs A to T, wherein the composition is a fabric care composition, a hard surface cleaner composition, a dish care composition, a hair care composition, a body cleansing composition, or a mixture thereof, preferably a fabric care composition, preferably a fabric care composition being a laundry detergent composition, a fabric conditioning composition, a laundry additive, a fabric pretreatment composition, a fabric refresher composition, or a mixture thereof.

[0178] V. The consumer product composition according to any of paragraphs A to U, wherein the composition is in the form of a liquid composition, a granular composition, a hydrocolloid, a single-compartment pouch, a multi-compartment pouch, a dissolvable sheet, a pastille or bead, a fibrous article, a tablet, a stick, a bar, a flake, a foam / mousse, a nonwoven sheet, or a mixture thereof.

[0179] W. A method of treating a surface, wherein the method comprises the step of contacting the surface with the consumer product composition according to any of paragraphs A to V, optionally in the presence of water.

[0180] Test methods

[0181] It is to be understood that the test methods disclosed in the Test Methods section of the present application are to be used to determine the respective parameter values of the subject matter claimed and described herein.

[0182] Extraction of delivery particles from finished product .

[0183] Except where otherwise indicated herein, the preferred method of isolating delivery particles from a finished product is based on the fact that most such delivery particles have a density different from that of water. The finished product is mixed with water in order to dilute and / or release the delivery particles. The dilute product suspension is centrifuged in order to accelerate the isolation of the delivery particles. Such delivery particles tend to float or sink in the dilute solution / dispersion of the finished product. Using a pipette or spatula, the top and bottom layers of the suspension are removed and subjected to additional cycles of dilution and centrifugation in order to isolate and enrich the delivery particles. The delivery particles are observed under a total magnification of 100x and 400x using an optical microscope equipped with crossed-polarized filters or differential interference contrast (DIC). Microscopic observation provides an initial indication of the presence, size, quality, and aggregation of the delivery particles.

[0184] To extract delivery particles from a liquid fabric enhancer, the finished product is subjected to the following sequence of procedures:

[0185] 1. Place three aliquots of approximately 20 ml of liquid fabric enhancer in three separate 50 ml centrifuge tubes and dilute each aliquot 1 : 1 with deionized water (e.g. 20 ml fabric enhancer + 20 ml deionized water), mix each aliquot well, and centrifuge each aliquot at approximately 10,000 x g for 30 minutes.

[0186] 2. After centrifuging as per step 1, discard the bottom water layer (approximately 10 ml) in each 50 ml centrifuge tube, then add 10 ml of deionized water to each 50 ml centrifuge tube.

[0187] 3. Repeat the process of centrifuging, removing the bottom water layer, and then adding 10 ml of deionized water to each 50 ml centrifuge tube two more times for each aliquot.

[0188] 4. Remove the top layer with a spatula or pipette, and

[0189] 5. Transfer the top layer to a 1.8 ml centrifuge tube and centrifuge at approximately 20,000 x g for 5 minutes.

[0190] 6. Remove the top layer with a spatula and transfer to a new 1.8 ml centrifuge tube and add deionized water until the tube is completely full, then centrifuge at approximately 20,000 x g for 5 minutes.

[0191] 7. Remove the bottom layer with a fine pipette and add deionized water until the tube is completely full and centrifuge at approximately 20,000 x g for 5 minutes.

[0192] 8. Repeat step 7 five more times (for a total of six times).

[0193] If both a top layer and a bottom layer of enriched delivery particles occur in step 1 above, proceed immediately to step 3 (i.e. skip step 2) and continue with steps 4 through 8. Once those steps have been completed, additionally remove the bottom layer from the 50 ml centrifuge tube of step 1 using a spatula or / and pipette. Transfer the bottom layer to a 1.8 ml centrifuge tube and centrifuge at approximately 20,000 x g for 5 minutes. Remove the bottom layer in the new tube and add deionized water until the tube is completely full, then centrifuge at approximately 20,000 x g for 5 minutes. Remove the top layer (water) and add deionized water again until the tube is full. Repeat this five more times (for a total of six times). Re-combine the enriched delivery particles along with the separated top and bottom layers.

[0194] If the fabric enhancer has a white color, or it is difficult to discern the layer of delivery particle enrichment, add 4 drops of dye, such as Liquitint Blue JH 5% premix from Milliken & Company (Spartanburg, South Carolina, USA) to the centrifuge tube of Step 1, and proceed with the separation as described above.

[0195] For extraction of delivery particles from a solid end product that is readily dispersible in water, mix 1 L of deionized water with 20 g of the end product (e.g., detergent pods, films, gels, and particles; or water-soluble polymers; soap chips and bars; and other water-soluble substrates such as salts, sugars, clays, and starches). When extracting delivery particles from end products that are not readily dispersible in water, such as waxes, dryer sheets, dryer bars, and greasy materials, it can be necessary to add a detergent, stir, and / or gently heat the product, and dilute, in order to release the delivery particles from the substrate. The use of organic solvents or drying the delivery particles should be avoided during the extraction step, as these actions can damage the delivery particles during this phase.

[0196] To extract delivery particles from a liquid end product that is not a fabric softener or fabric enhancer (e.g., liquid laundry detergent, liquid dish detergent, liquid hand soap, lotion, shampoo, conditioner, and hair dye), mix 20 ml of the end product with 20 ml of deionized water. If necessary, NaCl (e.g., 1 g to 4 g of NaCl) can be added to the diluted suspension to increase the density of the solution and facilitate the delivery particles floating to the top layer. If the product has a white color that makes it difficult to discern the layer of delivery particles formed during centrifugation, a water-soluble dye can be added to the diluent to provide visual contrast.

[0197] Subject the water and product mixture to successive cycles of centrifugation, involving removal of the top and bottom layers, re-suspending those layers in fresh diluent, and then further centrifugation, separation, and re-suspension. Each cycle of centrifugation occurs in a 1.5 ml to 50 ml volume tube, using centrifugal forces up to 20,000 x g, for a time period of 5 minutes to 30 minutes. It is typically necessary to have at least six cycles of centrifugation to extract and clean enough delivery particles for testing. For example, the initial cycle of centrifugation can be performed in a 50 ml tube, spun at 10,000 x g for 30 minutes, and then five further cycles of centrifugation, in which the material from the top and bottom layers is separately re-suspended in fresh diluent in 1.8 ml tubes, and each cycle is spun at 20,000 x g for 5 minutes.

[0198] If delivery particles are microscopically observed in both the top and bottom layers, the delivery particles from both of these layers are recombined after the final centrifugation step to form a single sample containing all of the delivery particles extracted from the product. The extracted delivery particles should be analyzed as soon as possible, but they can be stored in suspension in deionized water for up to 14 days prior to analysis.

[0199] Those skilled in the art will recognize that various other protocols can be designed for extracting and isolating delivery particles from a finished product, and will recognize that such methods require confirmation via comparison of resulting measurements taken before and after the delivery particles are added to the finished product and extracted from the finished product.

[0200] Benefit agent leakage

[0201] The amount of benefit agent leakage from a delivery particle is determined according to the following method:

[0202] a.) Two samples of the stock slurry of delivery particles are obtained in an amount such that 1 g of encapsulated perfume (e.g., 1 g of perfume oil, not including shell and / or partitioning modifier, if present) is present in each sample (or other amount as indicated).

[0203] b.) One sample of the stock slurry of delivery particles is added to an appropriate amount of product base (e.g., a liquid detergent product or LFE product) in which the delivery particles will be used to form a total of 100 g (e.g., 5 g of slurry and 95 g of product base) and the mixture is labeled as Sample 1. A second sample of the stock delivery particle slurry in its pure form, which is not exposed to the product base, is used immediately in step d below and is labeled as Sample 2.

[0204] c.) The product base containing the delivery particles (Sample 1) is aged at 35 °C (or other time and / or temperature as indicated) in a sealed glass jar for one week.

[0205] d.) The delivery particles are recovered from both samples using filtration. The delivery particles in Sample 1 (in the product base) after the aging step are recovered. The delivery particles in Sample 2 (pure stock slurry) are recovered at the same time as the start of the aging step for Sample 1.

[0206] e.) The recovered delivery particles are treated with a solvent to extract the benefit agent material from the delivery particles.

[0207] f.) The solvent containing the extracted benefit agent from each sample is analyzed via chromatography. The resulting benefit agent peak areas under the curve are integrated and these areas are summed to determine the total amount of benefit agent extracted from each sample.

[0208] g.) The percent leakage of benefit agent is determined by calculating the difference between the value obtained for the total amount of benefit agent extracted from Sample 2 minus the value obtained for the total amount of benefit agent extracted from Sample 1, expressed as a percentage of the total amount of benefit agent extracted from Sample 2, as represented by the following equation:

[0209]

[0210] Viscosity

[0211] The viscosity of the liquid finished product is measured using an AR 550 rheometer / viscometer from TA Instruments (New Castle, DE, USA) with parallel steel plates having a 40 mm diameter and a 500 pm gap size. The viscosity is measured at 20 s -1 The high shear viscosity at 0.05 s -1 The low shear viscosity at 0.01 s -1 The viscosity is measured at 25 s -1 The viscosity is measured at 25 s

[0212] Perfume, perfume raw material (PRM), and / or partitioning modifier

[0213] A. Identity and total amount

[0214] To determine the identity of, and quantify the total weight of, the partitioning modifier in a flavour, flavour ingredient or perfume raw material (PRM), or in a capsule slurry, and / or the flavour, flavour ingredient or perfume raw material encapsulated in a delivery agent encapsulate, a gas chromatograph with mass spectrometer / flame ionisation detector (GC-MS / FID) is employed. Suitable equipment includes: Agilent Technologies G1530A GC / FID; Hewlett Packer Mass Selective Device 5973; and 5% phenyl-methyl polysiloxane column J&W DB-5 (30m length x 0.25mm internal diameter x 0.25μm film thickness). Approximately 3g of finished delivery agent encapsulate or suspension is weighed and the weight recorded, then the sample is diluted with 30mL of deionised water and filtered through a 5.0μm pore size nitrocellulose filter membrane. The material trapped on the filter is dissolved in 5mL of ISTD solution (25.0mg / L tetradecane in anhydrous alcohol) and heated at 60°C for 30 minutes. The cooled solution is filtered through a 0.45μm pore size PTFE syringe filter and analysed via GC-MS / FID. Three known flavour oils are used as comparative benchmark standards. Data analysis involves summing the total area counts minus the ISTD area count and calculating the average response factor (RF) for the three standard flavour materials. The response factor and total area count for the encapsulated flavour product are then used with the sample weight to determine the total weight percentage of each PRM in the encapsulated flavour. The PRMs are identified by the mass spectral peaks.

[0215] B. Amount of unencapsulated material

[0216] To determine the amount of unencapsulated flavour and (optionally) partitioning modifier material in a composition such as a slurry, the following equipment is used for the analysis using the analytical method provided after the following table.

[0217]

[0218] To prepare flavour standards in ISS hexane, weigh 0.050 + / - 0.005 g of the required PMC flavour oil into a 50mL volumetric flask (or recalculate the other volume size in grams of flavour oil to be added). Fill to the line with ISS hexane solution from above. ISS hexane is 0.1 g of tetradecane in 4 litres of hexane.

[0219] To prepare the 5% surfactant solution, weigh 50g + / - 1 g of sodium dodecyl sulphate in a beaker and quantitatively transfer to a 1 litre volumetric flask using purified water and ensure the surfactant is fully dissolved.

[0220] To prepare a sample of the PMC composition (e.g., slurry), confirm that the composition (e.g., slurry) is well mixed; mix if necessary. Weigh 0.3 + / - 0.05 g of the composition sample onto the bottom of a 10 mL vial. Avoid having composition on the walls of the vial.

[0221] To operate the instrument, determine the target ions for quantitation of each PRM (and optional partitioning modifier) as well as a minimum of one qualifier ion, preferably two. Generate a calibration curve from perfume standards of each PRM. Using the sample weight and individual PRM weight %, plot or record the integration and amount of extracted ion chromatogram (EIC) for each PRM.

[0222] The amount of free oil is determined from the response of each PRM to the calibration curve and summed for all different perfumes and optional partitioning modifiers.

[0223] C. Determination of encapsulated material

[0224] The determination of encapsulated oil and optional partitioning modifier is made by subtracting the weight of free / unencapsulated oil found in the composition (e.g., slurry) from the total oil amount (by weight) found in the composition.

[0225] Analytical determination of wall material

[0226] This method determines the amount of wall material. First, the wall material is isolated by end filtration of particles larger than 0.45 microns. Subsequent analysis by thermal gravimetric analysis allows for removal of inorganic materials and other (organic) stock slurry ingredients.

[0227] A. Sample preparation

[0228] This procedure applies end filtration to remove the soluble portion of the sample. Different solvents are used sequentially to maximize removal of interfering materials prior to TGA analysis.

[0229] The following materials and / or equipment are used:

[0230] • Filtration equipment

[0231] o Vacuum pump: Millipore model WP6122050 or equivalent.

[0232] o Thick-walled vacuum tubing connecting the pump to the filtration apparatus.

[0233] o Filtration flask 500 ml or 1000 ml.

[0234] o Filtration cup: e.g., 250 ml Millipore filtration funnel (“Milli Cup”), filtration material: 0.45 micron membrane, solvent resistant.

[0235] o Sealed plastic containers for holding the filter devices while weighing.

[0236] o Standard laboratory glassware (glass beakers 100 ml - 250 ml, graduated cylinders 50 ml - 250 ml).

[0237] • Drying equipment

[0238] o Vacuum oven and vacuum pump (set 60°C - 70°C / vacuum: 30 inches of mercury vacuum).

[0239] o Desiccator or constant humidity chamber (to keep the residue in a controlled environment during cooling).

[0240] • Solvents

[0241] o All solvents: analytical grade minimum: 2-propanol, acetone, chloroform

[0242] The filtration procedure is as follows: To prepare the filter device, the weight of a pre-dried filter device (e.g. a Milli cup filter) is recorded down to 0.1 mg - 0.2 mg. Pre-drying involves the same drying step as the one performed on the filter after the filtration is completed.

[0243] The sample is filtered by weighing 1 gram to 2 grams of slurry feedstock (note the weight down to 0.1 mg - 0.2 mg) into a glass beaker (250 ml) or directly into the filter device. 20 ml of deionized water is added and vortexed to homogenize the sample. 80 ml of isopropanol is added and the sample is homogenized with the solvent; heating is used to flocculate the sample. The filter device is placed on a filter flask and vacuum filtration is started. After the filtration is completed, 100 ml of chloroform is added. The filtration is continued. 10 ml - 20 ml of acetone is added and filtered through the membrane to remove traces of chloroform. The filter is removed from the filtration system and dried in a vacuum oven. After cooling, the filter is weighed and the weight is recorded.

[0244] The percentage residue (gravimetric residue) is calculated by dividing the weight difference of the filter + residue and the filter only weight (= net weight of the residue after filtration) by the weight of the feedstock slurry sample and multiplying by 100 to obtain % units. The % residue is continued to be measured by TGA analysis.

[0245] Thermogravimetric analysis (TGA) is performed with the following equipment and settings: TGA: TA instruments Discovery TGA; pan: sealed aluminum; purge: N2 at 50 ml / min; program: temperature ramp to 500°C at 10°C / min; TGA is coupled with a Nicolet Nexus 470 FTIR spectrometer for evolved gases.

[0246] For TGA data analysis, the weight loss between 350 °C and 500 °C is due to the decomposition of the polymeric wall material of the perfume microcapsules and the still remaining (burnt) perfume compounds. This weight loss is used to calculate the insoluble polymer fraction. At 500 °C, a residue of unburnt material is still present and should be taken into account when calculating the insoluble polymer fraction.

[0247] Analytical determination of core:wall ratio

[0248] When the amount of core and wall material feed is not readily available, the core:wall ratio of the encapsulates can be determined analytically using the methods described herein.

[0249] More specifically, the above-described methods allow the determination of the amount (by weight) of perfume, partitioning modifier, and wall material in a perfume capsule composition (e.g., a slurry) and can be used to calculate the core:wall ratio. This is done by dividing the total amount (by weight) of perfume plus partitioning modifier present in the composition by the amount (by weight) of crosslinked wall material present in the composition.

[0250] Test method for determination of log P

[0251] The log of the octanol / water partition coefficient (logP) of each PRM in the tested perfume mixture was calculated. The logP of the individual PRMs was calculated using the Consensus logP Computational Model version 14.02 (Linux) available from Advanced Chemistry Development Inc. (ACD / Labs) (Toronto, Canada) to provide a dimensionless logP value. The Consensus logP Computational Model of ACD / Labs is part of the ACD / Labs suite of models.

[0252] Volume weighted particle size and size distribution

[0253] The volume-weighted capsule size distribution is determined by single particle optical sensing (SPOS) (also known as optical particle counting (OPC)) using an AccuSizer 780AD instrument and accompanying software CW788 version 1.82 (Particle Sizing Systems, Santa Barbara, California, U.S.A.) or equivalent. The instrument is configured with the following conditions and selections: flow rate = 1 ml / sec; lower size threshold = 0.50 pm; sensor model = LE400-05 or equivalent; auto dilution = on; collection time = 60 seconds; number of channels = 512; reservoir fluid volume = 50 ml; maximum coincidence = 9200. Begin the measurement by bringing the sensor into cold state by rinsing with water until the background count is less than 100. Introduce the sample in suspension of delivered capsules and adjust the density of the capsules with DI water by auto dilution as needed to get a capsule count of at least 9200 per ml. Analyze the suspension for a period of 60 seconds. Plot and record the resulting volume-weighted PSD data and determine the values for the desired volume-weighted particle sizes (e.g., median / 50th percentile, 5th percentile, and / or 90th percentile).

[0254] The width index can be calculated by determining the delivered particle size at which 90% of the cumulative particle volume is exceeded (90% size), the particle size at which 5% of the cumulative particle volume is exceeded (5% size), and the median volume-weighted particle size (50% size: the particle size at which 50% of the particle volume is above and below).

[0255] Width index = ((90% size) - (5% size)) / 50% size.

[0256] Break strength test method

[0257] To measure the average burst strength of the population and / or determine delta burst strength, three different measurements are performed: i) volume-weighted capsule size distribution; ii) the diameters of 10 individual capsules in each of 3 specified size ranges (and / or 30 individual capsules at the median volume-weighted particle size, if the average burst strength is to be determined), and; iii) the burst force of the same 30 individual capsules.

[0258] a.) The volume-weighted capsule size distribution is determined as described above. The resulting volume-weighted PSD data is plotted and recorded, and the values for the median, 5th percentile, and 90th percentile are determined.

[0259] b.) The diameter and burst force value (also referred to as the popping force value) of each capsule is measured by a custom computer-controlled micro-manipulation instrument system having a lens and camera capable of imaging the delivery capsule and having a fine flat-end probe connected to a force transducer (such as a Model 403A available from Aurora Scientific Inc. (Canada) or equivalent), as described in Zhang, Z. et al. (1999) "Mechanical strength of single microcapsules determined by a novel micromanipulation technique." J. Microencapsulation, Vol. 16, No. 1, pp. 117-124, and Sun, G. and Zhang, Z. (2001) "Mechanical Properties of Melamine-Formaldehyde microcapsules." J. Microencapsulation, Vol. 18, No. 5, pp. 593-602, and available from University of Birmingham (Edgbaston, Birmingham, UK).

[0260] c.) A drop of the delivery capsule suspension is placed on a glass microscope slide and dried for several minutes under ambient conditions to remove water and obtain a sparse monolayer of individual capsules on the dried slide. The concentration of capsules in the suspension is adjusted as needed to obtain a suitable capsule density on the slide. More than one slide preparation can be required.

[0261] d.) The slide is then placed on the sample fixation stage of the micro-manipulation instrument. Thirty benefit delivery capsules on the slide are selected for measurement such that ten capsules are selected within each of three predetermined size bands. Each size band refers to the capsule diameters derived from the volume-weighted PSD generated by the Accusizer. The three size bands of capsules are: median / 50thpercentile diameter + / - 2 pm; 5thpercentile diameter + / - 2 pm; and 90thpercentile diameter + / - 2 pm. Capsules that appear deflated, leaking, or damaged are excluded from the selection process and are not measured.

[0262] i. If there are not enough capsules available at the particular size band + / - 2 pm, the size band can be increased to + / - 5 pm.

[0263] ii. If the average burst strength of the population is to be determined, 30 (or more) capsules at the median / 50thpercentile size band can be measured.

[0264] e.) For each capsule of the 30 selected capsules, the diameter of the capsule is measured from the image on the micromanipulator and recorded. The same capsule is then compressed between two flat surfaces (i.e., a flat end force probe and a glass microscope slide) at a speed of 2 pm per second until the capsule ruptures. During the compression step, the probe force is continuously measured and recorded by the data acquisition system of the micromanipulation instrument.

[0265] f.) The cross-sectional area of each of the selected capsules is calculated using the measured diameter and assuming a spherical capsule (πr 2 where r is the radius of the capsule before compression). The rupture force of each selected capsule is determined from the recorded force probe measurements as shown in Zhang, Z. et al. (1999) "Mechanical strength of single microcapsules determined by a novel micromanipulation technique." J. Microencapsulation, Vol. 16, No. 1, pp. 117-124, and Sun, G. and Zhang, Z. (2001) "Mechanical Properties of Melamine-Formaldehyde microcapsules." J. Microencapsulation, Vol. 18, No. 5, pp. 593-602.

[0266] g.) The rupture strength of each of the 30 capsules is calculated by dividing the rupture force (in Newtons) by the calculated cross-sectional area of the corresponding capsule.

[0267] h.) The following is calculated:

[0268] The average rupture strength of the population is determined by averaging the rupture strength values of (at least) thirty capsules at the median / 50thpercentile size band.

[0269] The delta rupture strength is calculated as follows:

[0270]

[0271] where d i FS at the i-th percentile of the volume-weighted size distribution.

[0272] Examples

[0273] The examples provided below are intended to be illustrative in nature and are not intended to be limiting.

[0274] Example 1. Exemplary synthesis of delivery particles

[0275] Exemplary synthesis methods for different delivery particles are provided below. Details of the materials used are provided in Table 1.

[0276] A. Method description for making 18 or 36 micron capsules - 98:2 core:wall ratio (C:W) and 40% IPM with CN975 .

[0277] To a 1 L jacketed stainless steel reactor was added 143.12 grams of perfume oil and 137.45 grams of isopropyl myristate and mixed under a nitrogen environment with the aid of a high shear mixer fitted with a chopper blade. The solution was heated to 35°C, then 0.33 grams of Vazo 67 (initiator) was introduced and subsequently the total mixture was heated to 70°C and held at that temperature for 45 minutes, then the system was cooled to 50°C. Once this temperature was reached, a separately prepared solution containing 63.05 grams of perfume oil, 0.075 grams of CD9055, 0.075 grams of TBAEMA and 6.23 grams of CN975 was introduced to the reactor and the total mixture was mixed at 50°C for 10 min. Then after stopping the agitation, an aqueous phase consisting of 107 grams of emulsifier (5% solution of PVOH 540), 340.03 grams of RO water, 0.22 grams of V-501 and 0.21 grams of NaOH (21% solution) was added to the reactor. Milling was performed after the addition of the aqueous phase until the particle size was achieved. The emulsion was then heated first to 75°C and held at that temperature for 240 minutes, and then to 95°C and held for 360 min, then it was cooled to 25°C. At this point, the slurry was discharged from the reactor to a vessel to add rheology modifier (xanthan gum 1.59 grams) and preservative (Acticide BWS-10; 0.61 grams). The rheology modifier was mixed for 30 min. The preservative was added last and mixed for 5-10 min. The final slurry was then characterized and tested as deemed appropriate.

[0278] Delivery particle examples 1 and 3 were synthesized essentially according to this method as described in Example 2 Table 2 below.

[0279] Core:wall weight ratio - sample calculations

[0280] Core:wall weight ratio is determined by dividing the weight of the total core material feed (e.g., flavor oil and partitioning modifier) by the weight of the total wall material feed (e.g., wall monomers and initiator). Alternatively, the relative percentage of core material in the population of particles can be determined by dividing the weight of the total core material feed by the sum of the total weight of the core material feed plus the total weight of the wall material feed and multiplying by 100; the remaining percentage (100% core) is the relative percentage of wall material - these values can then be expressed as a ratio. Similarly, the relative percentage of wall material in the population of particles can be determined by dividing the total weight of the wall material feed by the sum of the weight of the total core material feed and the total wall material feed and multiplying by 100.

[0281] Sample calculations for "98:2" capsules formed from the examples of this section are provided below, where the core contains flavor oil and partitioning modifier (isopropyl myristate), and the wall contains wall monomers (CN975, CD9055, and TBAEMA) and initiator (Vazo 67 and V-501).

[0282]

[0283]

[0284]

[0285] B. Method description for making 18 or 36 micron capsules - 98:2 (C:W) and 40% IPM with SR295, EB140, EB895, TMPTA, SR444, or SR368

[0286] The method is the same as described in A, except that each of the indicated monomers is used in place of CN975. The weight requirement of monomers in grams remains constant.

[0287] Delivery particle examples 4-10, 12, 14, 16, 18, and 20 are synthesized essentially according to this method, as described in Example 2 Table 2 below.

[0288] C. Method description for making 36 micron capsules - 98:2 (C:W) and 0% IPM with CN975, SR295, EB140, EB895, TMPTA, SR444, or SR368

[0289] The method is the same as described in A or B, except that IPM is not used. For each of these examples, the requirement for IPM is replaced with flavor oil, regardless of which monomers are used.

[0290] Delivery particle examples 2, 11, 13, 15, 17, 19, and 21 are synthesized essentially according to this method, as described in Example 2 Table 2 below.

[0291] D. Method description for making 18 or 36 micron capsules - 98:2 (C:W) and 40% IPM with SR295, EB140, EB895, TMPTA, SR444, SR368, and CN975, and no secondary wall monomer .

[0292] The same as A except that 0.08 g of CD9055 and 0.08 g of TBAEMA were removed and replaced with the required amount of CN975 or other monomer as indicated.

[0293] Delivery particles Examples 25 and 26 were synthesized essentially according to this method as described below in Example 2 Table 2.

[0294] E. Method description for making 18 or 36 micron capsules - 90:10 (C:W) and 40% / 0% IPM with CN975

[0295] Essentially the same as A (for those with 40% IPM) or C (for those with 0% IPM) except that the weight ratio of core material to wall material was adjusted to provide a 90:10 core:polymeric wall weight ratio.

[0296] Delivery particles Examples 22 to 24 were synthesized essentially according to this method as described below in Example 2 Table 2.

[0297] Table 1

[0298]

[0299] Example 2. Properties of various delivery particles

[0300] Various properties of the delivery particles synthesized according to the method described in Example 1 are provided in Table 2 below. The value for "free oil" is given as the percentage (wt%) of perfume oil that remains unencapsulated in the slurry after capsule formation; a lower free oil value indicates a more efficient encapsulation process (e.g., a relatively large amount of perfume oil was encapsulated). Bleed in heavy duty liquid (HDL) detergent products was measured after one week of storage at 35°C; the bleed values in Table 2 are provided in (%) and were determined by headspace analysis of the neat product.

[0301] Table 2

[0302]

[0303] In addition to the data given in Table 2, the results are illustrated in Figures 1 to 4 .

[0304] Figure 1 is a graph depicting the percent bleed of perfume delivery particles prepared according to the present disclosure at 18 and 36 microns in diameter and compared to 36 micron microcapsules using (meth)acrylate monomers of various functionalities as indicated in the absence of isopropyl myristate.

[0305] Figure 2 ​​is a plot depicting 1 week leakage of 18 micron and 36 micron diameter particles of (meth)acrylate monomers with various functionalities. Particles dispersed in liquid laundry detergent were measured at 35°C, with measurements taken at 1 week. Control is the same capsule at 36 microns without any isopropyl myristate.

[0306] Figure 3 is a plot depicting the percentage of free oil obtained from perfume delivery particles made at 18 micron and 36 micron diameter using the indicated wall materials.

[0307] Figure 4 is a plot depicting the percent by weight leakage of delivery particles made at 18 micron and 36 micron diameter using various walls at 40% isopropyl myristate by weight of the core.

[0308] As shown in Table 2 and the plots, the delivery particles according to the present disclosure having the preferred combination of monomer selection, core:polymer wall weight ratio, particle size, and partitioning modifier tend to exhibit relatively low levels of leakage.

[0309] Example 3. Performance data

[0310] To compare different core:wall polymer ratios and different sizes of delivery particles, samples of liquid fabric enhancer (7% ester quat as softening active) were prepared with different particles. Each type of particle contained the same material as their respective wall polymer (primarily CN975 monomer).

[0311] The same perfume was used in each particle type, and each core also contained about 40% by weight of a partitioning modifier (i.e., isopropyl myristate). The particles were added in the corresponding amounts to provide 0.158% by weight of perfume by weight of the fabric enhancer product composition.

[0312] Cotton terry tracers (combined with mixed fabric load) were treated with fabric enhancer in an automatic washing machine (1200 rpm) in a short cotton cycle, with the fabric enhancer added during the final rinse cycle. After the fabric was treated, expert perfumers made olfactory assessments of perfume intensity at the DRY and RUB contact points, and the scores at each contact point were averaged to give a score for that contact point. Scores were based on a perfume odor intensity scale from 0 to 100, where 0 = no perfume odor, 25 = slight perfume odor, 50 = moderate perfume odor, 75 = strong perfume odor, and 100 = very strong perfume odor. Notably, internal testing indicated that these benefits were not as pronounced at the wet contact points and on all fabrics. In addition, headspace data was collected over the treated fabric using solid phase microextraction (SPME) headspace method and gas chromatography mass spectrometry (GCMS).

[0313] The description and data results for the delivery particles are provided in Table 3 below. Group Z includes delivery particles according to the present disclosure, while Groups W, X, and Y include comparative particles.

[0314] Table 3 .

[0315]

[0316] As shown in Table 3, the delivery particles having a relatively higher core:wall polymer ratio (e.g., Groups X and Z having a C:W ratio of 98:2) generally outperformed the particles having a relatively lower ratio at one or both of the test contact points.

[0317] Further, by comparing the results of Group Z with the results of Group X, it is shown that the delivery particles having a relatively larger particle size (e.g., 36 microns versus 18 microns) performed relatively better at the contact points shown.

[0318] Example 4. Exemplary formulation - liquid fabric enhancer

[0319] Table 4 shows exemplary formulations of compositions according to the present disclosure. Specifically, the following compositions are liquid fabric enhancer products.

[0320] Table 4 .

[0321]

[0322] 1 Ester Quaternary Ammonium Salt 1 : mixture of bis-(2-hydroxypropyl)-dimethyl methyl sulfate ammonium fatty ester, (2-hydroxypropyl)-(1 -methyl-2-hydroxyethyl)-dimethyl methyl sulfate ammonium fatty ester, and bis-(1 -methyl-2-hydroxyethyl)-dimethyl methyl sulfate ammonium fatty ester, wherein the fatty ester is prepared from a mixture of C12-C18 fatty acids (REWOQUAT DIP V 20M Conc from Evonik)

[0323] 2 Ester Quaternary Ammonium Salt 2: N,N-bis(hydroxyethyl)-N,N-dimethyl ammonium chloride fatty ester, prepared from a mixture of C12-C18 fatty acids (REWOQUAT CI-DEEDMAC from Evonik)

[0324] 3 Ester Quaternary Ammonium Salt 3: esterification product of fatty acids (C16-18 and C18 unsaturated) with triethanolamine, quaternized with dimethyl sulfate (REWOQUAT WE 18 from Evonik)

[0325] * Delivery particles according to the present disclosure, e.g., Delivery Particle Example #1, Table 2, Example 2 above. The % "Active" provided is the amount of fragrance delivered to the composition.

[0326] Example 5. Exemplary formulation - laundry additive granule

[0327] Table 5 shows exemplary formulations of compositions according to the present disclosure. Specifically, the following compositions are laundry additive particles in the form of a tablet or "bead", e.g., in the form of DOWNY UNSTOPABLES TM (available commercially from The Procter & Gamble Company).

[0328] Table 5 .

[0329]

[0330] 1 PLURIOL E8000 (from BASF)

[0331] 2 esterification product of fatty acids (C16-18 and C18 unsaturated) with triethanolamine quaternized with dimethyl sulfate (REWOQUAT WE18, from Evonik)

[0332] 3 cationically modified hydroxyethylcellulose

[0333] 4 Perfume delivery particles according to the present disclosure, e.g., the population formed in Example 1 above. The % provided is the amount of aqueous slurry provided to the composition, wherein the slurry comprises about 45 wt% of the delivery particles (core + shell).

[0334] The dimensions and values disclosed herein are not to be understood as being strictly limited to the exact numerical values recited. Instead, unless otherwise specified, each such dimension is intended to mean both the exact value and a functional equivalent ranging

[0335] Every document cited herein, including any cross referenced or related patent or application and any patent application or patent to which this application claims priority or benefit thereof, is hereby incorporated herein by reference in its entirety unless expressly excluded or otherwise limited. The citation of any document is not an admission that it is prior art with respect to any application disclosed or claimed herein or that it alone, or along with any other document or together with any relevant art, teaches, suggests or discloses any such application. Further, the citation of any document is not an admission that it is prior art with respect to any application disclosed or claimed herein or that it alone, or along with any other document or together with any relevant art, teaches, suggests or discloses such application. In addition, with respect to any document that has a priority date or filing date prior to the priority date or filing date of this application, the priority date or filing date of this application is used, not the priority date or filing date of the earlier document. Finally, documents referred to or cited in this application are not admitted to be prior art with respect to the application disclosed or claimed herein, unless expressly so admitted.

[0336] While particular embodiments of the present application have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the application. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this application.

Claims

1. A consumer product composition comprising: Processing aids, and Delivery of particle groups, The delivery particles described herein include a core and a polymer wall surrounding the core. The core contains a beneficial agent and a distribution modifier. The distribution modifier is selected from the group consisting of: vegetable oils, modified vegetable oils, monoesters, diesters and triesters of C4-C24 fatty acids, lauryl benzophenone, and mixtures thereof. The distribution modifier is present in the core at a level of 5% to 55% by weight of the core. The polymer wall comprises a (meth)acrylate polymer, which is at least partially derived from one or more oil-soluble or oil-dispersible multifunctional (meth)acrylate monomers or oligomers. The one or more oil-soluble or oil-dispersible multifunctional (meth)acrylate monomers or oligomers have at least six functional groups that can be polymerized by free radicals. The condition is that at least one of the free radical polymerizable functional groups is an acrylate or a methacrylate; The core and the polymer wall are present in a weight ratio of 96:4 to 99.5:0.5; and The delivery particles are characterized by a volume-weighted median particle size of 30 to 50 micrometers.

2. The consumer product composition of claim 1, wherein the dispensing modifier is selected from the group consisting of isopropyl myristate, vegetable oil, modified vegetable oil, lauryl laurate, methyl docosanoate, methyl laurate, methyl palmitate, methyl stearate, and mixtures thereof.

3. The consumer product composition of claim 1, wherein the delivery particles comprise the core and the polymer wall present in a weight ratio of 97:3 to 99:

1.

4. The consumer product composition according to any one of claims 1-3, wherein the one or more oil-soluble or oil-dispersible polyfunctional (meth)acrylate monomers or oligomers comprise exactly six functional groups that are free radical polymerizable.

5. The consumer product composition according to any one of claims 1-3, wherein the oil-soluble or oil-dispersible polyfunctional (meth)acrylate monomer or oligomer comprises a polyfunctional aromatic polyurethane acrylate.

6. The consumer product composition according to any one of claims 1-3, wherein the (meth)acrylate polymer is at least partially derived from a monomer selected from aminomethacrylates, acid methacrylates, or combinations thereof.

7. The consumer product composition according to any one of claims 1-3, wherein the (meth)acrylate polymer of the polymer wall is a reaction product derived from the oil-soluble or oil-dispersible polyfunctional (meth)acrylate, the second monomer, and the third monomer.

8. The consumer product composition of claim 7, wherein the second monomer comprises a basic (meth)acrylate monomer, and wherein the third monomer comprises an acidic (meth)acrylate monomer.

9. The consumer product composition according to any one of claims 1-3, wherein the polymer wall of the delivery particles further comprises a polymer emulsifier retained in the polymer wall.

10. The consumer product composition of claim 9, wherein the polymer emulsifier comprises polyvinyl alcohol.

11. The consumer product composition according to any one of claims 1-3, wherein the (meth)acrylate polymer of the polymer wall is at least partially derived from at least one free radical initiator.

12. The consumer product composition of claim 11, wherein the at least one free radical initiator comprises a water-soluble or water-dispersible free radical initiator.

13. The consumer product composition of claim 11, wherein the at least one free radical initiator comprises a water-soluble or water-dispersible free radical initiator and an oil-soluble or oil-dispersible free radical initiator.

14. The consumer product composition of claim 11, wherein the free radical initiator is present in an amount of 2% to 50% by weight of the polymer wall.

15. The consumer product composition according to any one of claims 1-3, wherein the beneficial agent is a fragrance.

16. The consumer product composition according to any one of claims 1-3, wherein the beneficial agent is a fragrance containing a fragrance raw material characterized by 2.5 to 4 logP.

17. The consumer product composition according to any one of claims 1-3, wherein the dispensing modifier is isopropyl myristate.

18. The consumer product composition according to any one of claims 1-3, wherein the delivery particle group is characterized by an average breaking strength of 0.2 MPa to 10 MPa.

19. The consumer product composition according to any one of claims 1-3, wherein the polymer wall of the delivery particles further comprises a coating material.

20. The consumer product composition of claim 19, wherein the coating material is selected from the group consisting of: poly(meth)acrylate, poly(ethylene-maleic anhydride), polyamine, wax, polyvinylpyrrolidone, polyvinylpyrrolidone-ethyl acrylate, polyvinylpyrrolidone-vinyl acrylate, polyvinylpyrrolidone methacrylate, polyvinylpyrrolidone / vinyl acetate, polyvinyl acetal, polyvinyl butyral, polysiloxane, poly(propylene maleic anhydride), maleic anhydride derivatives, and co-occurrences of maleic anhydride derivatives. Polymers, polyvinyl alcohol, styrene-butadiene latex, gelatin, gum arabic, carboxymethyl cellulose, carboxymethyl hydroxyethyl cellulose, hydroxyethyl cellulose, other modified cellulose, sodium alginate, deacetylated chitosan, casein, pectin, modified starch, polyvinyl methyl ether / maleic anhydride, poly(vinylpyrrolidone / methacryloylaminopropyltrimethylammonium chloride), polyvinylpyrrolidone / dimethylaminoethyl methacrylate, polyethyleneamine, polyvinylformamide, polyallylamine, copolymers of polyethyleneamine, and mixtures thereof.

21. The consumer product composition according to any one of claims 1-3, wherein the delivery particles are characterized by a volume-weighted median particle size of 30 micrometers to 40 micrometers.

22. The consumer product composition according to any one of claims 1-3, wherein the processing aid is selected from the group consisting of: surfactants, conditioning agents, deposition aids, rheology modifiers or structural agents, bleaching systems, stabilizers, detergent builders, chelating agents, dye transfer inhibitors, dispersants, enzymes, enzyme stabilizers, catalytic metal complexes, polymer dispersants, clay and dirt removal / anti-redeposition agents, brighteners, defoamers, siloxanes, colorants, fragrance enhancers, structural elasticizers, carriers, water-soluble growth promoters, processing aids, anti-agglomeration agents, formaldehyde removers, and mixtures thereof.

23. The consumer product composition according to any one of claims 1-3, wherein the treatment aid is an aesthetic dye.

24. The consumer product composition according to any one of claims 1-3, wherein the processing aid is a coating.

25. The consumer product composition according to any one of claims 1-3, wherein the processing aid is a pigment.

26. The consumer product composition according to any one of claims 1-3, wherein the processing aid is an additional fragrance delivery system.

27. The consumer product composition according to any one of claims 1-3, wherein the composition is a fabric care composition, a hard surface cleaner composition, a tableware care composition, a hair care composition, a body cleansing composition, or a mixture thereof.

28. The consumer product composition of claim 27, wherein the composition is a fabric care composition.

29. The consumer product composition of claim 27, wherein the composition is a fabric care composition as a laundry detergent composition, a fabric conditioning composition, a laundry detergent additive, a fabric pretreatment composition, a fabric freshener composition, or a mixture thereof.

30. The consumer product composition according to any one of claims 1-3, wherein the composition is in the form of a liquid composition, a particulate composition, an aqueous colloid, a single-compartment pouch, a multi-compartment pouch, a soluble sheet, a tablet or bead, a fibrous article, a tablet, a rod, a strip, a sheet, a foam / mousse, a nonwoven sheet, or a mixture thereof.

31. A method of treating a surface, wherein the method includes the step of contacting the surface with a consumer product composition according to any of the preceding claims. Optionally in the presence of water.

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