Patent Description:
Air care products, such as wick-based or microporous-membrane based products, may be used to deliver various freshening compositions into the air or onto a surface. The freshening compositions used with such air care products may include volatile materials such as perfume. The volatility of the freshening composition varies based on the particular components of the composition. As the vapor pressure of a freshening composition increases, the rate at which the freshening composition volatilizes also increases. As a result, the lifespan of an air care product can be dependent upon the particular freshening composition used. In some cases, carriers such as solvents and diluents are used to slow down the rate of evaporation of a particular freshening composition. In highly volatile freshening compositions, a high level of carriers may be used to slow down the evaporation of the freshening composition. Adding carriers and other materials to slow down the evaporation rate of the freshening composition may significantly reduce the level perfume materials in the freshening composition or may change the character of the freshening composition and scent intensity.

<CIT> discloses a system for treating air using a non-heated wick-type dispenser and two air treatment compositions having different formulations. One of the two compositions is used to impregnate or wet the wick and/or evaporation surface of the wick-type dispenser, while the second composition serves as a replenishing fluid. The relationship between the two compositions is described by a mathematical model and equation. The two compositions are formulated such that when used together they produce a constant emanating composition.

<CIT> discloses compositions for neutralizing unpleasant environmental odors by means of dispersion in the environment, including by means of electric air fresheners, sprays, automobile air fresheners, wick air freshener, gelatine air fresheners, candles, etc. In one example, this document discloses a composition comprising <NUM> wt% isopropyl myristate, <NUM>% ethanol as solvent and further components as perfume mixture.

<CIT> discloses perfume compositions, which may be used in a liquid electric plug-in air freshener with wick, and which comprise non-functional perfume components and a mixture of functional perfume components (FPCs). Isopropyl myristate (IPM) is listed amongst the FPCs. The total content of FPCs in the compositions is greater than <NUM>%.

Thus, it would be beneficial to provide a freshening composition that delivers long-lasting scent irrespective of the vapor pressure of the composition without significantly altering the formulation or character of the freshening composition.

The present invention relates to an air freshener product as claimed in the appended claims.

The present invention also relates to a method of freshening the air as claimed in the appended claims.

The following definitions may be useful for understanding the present disclosure.

As used herein, "air care product" means products for treating or fragrancing the air including energized (i.e. electrically powered) air freshening delivery systems including fan-based diffusers, liquid electric pluggable air fresheners, electromechanical actuating diffusers; passive diffusers (i.e. not electrically powered) including membrane-based in-room air fresheners, car vent air fresheners.

As used herein, "freshening composition" means a composition that includes one or more perfume raw materials that is intended to treat (e.g. eliminate or reduce/minimize malodors), fragrance, and/or freshen the air. The freshening composition may be used with or without an air care product. Freshening compositions disclosed herein include PRMs and may additionally include water, solubilizers, surfactants, diluents, malodor reducing actives, and perfume materials.

The perfume raw materials ("PRMs") disclosed and/or used in the perfume blends described herein encompass any stereoisomers of such PRMs.

Unless otherwise noted, all component or composition levels are in reference to the active portion of that component or composition, and are exclusive of impurities, for example, residual carriers or by-products, which may be present in commercially available sources of such components or compositions.

The present invention relates to an air freshener product comprising:.

The present invention also relates to a method of freshening the air comprising the steps of:.

The freshening composition is in a liquid form and can be a diffusive air freshener such as the liquid compositions used in FEBREZE® NOTICEables™ air freshener, AMBI PUR™ diffuser (single chamber & 3Volution), FEBREZE Car Vent Clips™ air freshener, or FEBREZE SMALL SPACES™ air freshener.

Freshening compositions have different evaporation rates depending on the volatility of the freshening composition. It has been found that a freshening composition comprising a low level of isopropyl myristate can drastically slow down the evaporation rate of a freshening composition, even highly volatile freshening compositions. Accordingly, air care products comprising the freshening composition are able to deliver long-lasting freshness using freshening compositions having a wide-range of vapor pressures.

The freshening composition may have a vapor pressure at <NUM> of about <NUM> Torr to about <NUM> Torr, alternatively about <NUM> Torr to about <NUM> Torr, alternatively about <NUM> Torr to about <NUM> Torr.

The freshening composition may have a viscosity of about <NUM> Pa. s (<NUM> cP) to less than about <NUM> Pa. s (<NUM> cP), alternatively about <NUM> Pa. s (<NUM> cP) to less than about <NUM> Pa. s (<NUM> cP), alternatively about <NUM> Pa. s (<NUM> cP) to less than about <NUM> Pa. s (<NUM> cP).

The freshening composition may be designed such that the composition may include a surface tension of about <NUM> mN/m to less than about <NUM> mN/m, alternatively about <NUM> mN/m to less than about <NUM> mN/m, alternatively about <NUM> mN/m to less than about <NUM> mN/m.

The freshening composition may be substantially free of volatile organic compounds ("VOCs"), meaning it has no more than about <NUM>%, alternatively no more than about <NUM> %, alternatively no more than about <NUM> %, alternatively no more than about <NUM>%, alternatively no more than about <NUM> %, by weight of the composition, of VOCs. The composition may be free of VOCs.

The freshening composition includes isopropyl myristate ("IPM") (IUPAC name: Propan-<NUM>-yl tetradecanoate, <NPL>), which is shown below as Formula I.

The freshening composition comprises from about <NUM> wt. % to about <NUM> wt. %, alternatively about <NUM> wt. % to about <NUM> wt. %, alternatively about <NUM> wt. % to about <NUM> wt. % isopropyl myristate, by weight of the overall freshening composition.

The freshening composition includes one or more carriers. The carrier may be selected from the group consisting of: a solvent, a diluent, a functional perfume component, or combinations thereof.

The carrier may be present in the freshening composition at a level of less than <NUM> wt. %, alternatively less than <NUM> wt. %, alternatively less than <NUM> wt. %, alternatively less than <NUM> wt. %, alternatively less than <NUM> wt. %, alternatively less than <NUM> wt. %, of the freshening composition.

The incorporation of a low level of isopropyl myristate may significantly reduce the level of carrier required to slow the evaporation rate of the freshening composition.

The carrier may include a solvent, diluent, or combinations thereof. The solvent or diluent may be selected from the group consisting of: dipropylene glycol methyl ether ("DPM"), tripropylene glycol methyl ether ("TPM"), <NUM>-methoxy-<NUM>-methyl-<NUM>-butanol ("MMB"), volatile silicone oil, and dipropylene glycol esters of methyl, ethyl, propyl, butyl, ethylene glycol methyl ether, ethylene glycol ethyl ether, diethylene glycol methyl ether, diethylene glycol ethyl ether, or any VOC under the tradename of Dowanol™ glycol ether, and combinations thereof.

The carrier may include functional perfume components ("FPCs"). FPCs are a class of perfume raw materials with evaporation properties that are similar to traditional carriers or VOCs commonly used in air freshening compositions. The FPCs aid in the evaporation of perfume raw materials and, in a mixture, provide a hedonic, fragrance benefit. FPCs may be used in relatively large concentrations without negatively impacting perfume character of the overall composition.

It has been understood that perfume raw material generates an olfactory response in the individual smelling the perfume. The minimum concentration of perfume ingredient which is consistently perceived to generate an olfactory response in an individual is known as the odor detection threshold ("ODT"). As the concentration of perfume is increased, so are the odor intensity of the perfume and the olfactory response of the individual. This continues until the concentration of the perfume reaches a maximum, at which point the odor intensity reaches a plateau beyond which there is no additional olfactory response by the individual. This range of perfume concentration through which the individual consistently perceives an odor is known as the Odor Detection Range ("ODR"). The concentration of perfume raw materials in a composition should be formulated less than or equal to the ODT or within the ODR of the perfume raw materials, since compositions comprising higher levels are costly and inefficient.

The Applicants have, however, found that in some circumstances it may be desirable to utilize FPCs that exceed the ODT, alternatively that exceed the ODR. Specifically, the use of these FPCs at higher levels than traditionally used in freshening compositions and without the presence of a traditional organic carriers, surprisingly, provides continuous fragrance to the atmosphere.

Perfume raw materials that are suitable as a FPC can be defined using Kovat's Index ("KI"). The KI places the volatility attributes of an analyte (e.g. component of a volatile composition) on a gas chromatography column in relation to the volatility characteristics of an n-alkane (normal alkane) series on that column. A typical gas chromatograph ("GC") column is a DB-<NUM> column available from Agilent Technologies of Palo Alto, California. By this definition, the KI of a normal alkane is set to 100n, where n is the number of carbon atoms in the n-alkane. The KI of an analyte, x, eluting at time t', between two n-alkanes with number of carbon atoms "n" and "N" having corrected retention times t'n and ttN respectively, will then be calculated as:
On a non-polar to slightly polar GC stationary phase, KI of analytes are correlated with their relative volatility. For example, analytes with smaller KIs tend to be more volatile than those with larger KIs. Ranking analytes with their corresponding KI values gives a good comparison of analyte evaporation rates in liquid-gas partitioning systems.

A suitable FPC may have a Kovat's index from about <NUM> to about <NUM>, alternatively about <NUM> to about <NUM>, alternatively about <NUM> to about <NUM>, alternatively about <NUM>.

Perfume raw materials that are suitable for use as a FPC can also be defined using ODT and non-polarizing scent character for a given perfume character scent camp. ODTs may be determined using a commercial gas chromatograph ("GC") equipped with flame ionization and a sniff-port. The GC is calibrated to determine the exact volume of material injected by the syringe, the precise split ratio, and the hydrocarbon response using a hydrocarbon standard of known concentration and chain-length distribution. The air flow rate is accurately measured and, assuming the duration of a human inhalation to last <NUM> seconds, the sampled volume is calculated. Since the precise concentration at the detector at any point in time is known, the mass per volume inhaled is known and concentration of the material can be calculated. To determine whether a material has a threshold below <NUM> ppb, solutions are delivered to the sniff port at the back-calculated concentration. A panelist sniffs the GC effluent and identifies the retention time when odor is noticed. The average across all panelists determines the threshold of noticeability. The necessary amount of analyte is injected onto the column to achieve a <NUM> ppb concentration at the detector. Typical gas chromatograph parameters for determining odor detection thresholds are listed below. The test is conducted according to the guidelines associated with the equipment.

Suitable FPCs may have an ODT from greater than about <NUM> ppb, alternatively greater than about <NUM> ppb, alternatively greater than about <NUM> ppb, alternatively greater than about <NUM> ppb, alternatively greater than about <NUM> ppb, alternatively greater than about <NUM> parts per million ("ppm").

In addition to Kovat's and ODT properties mentioned above, other physical chemical properties of perfume raw materials that may render them useful as a FPC are molecular weight, vapor pressure, boiling point, flashpoint, heat of vaporization, viscosity, solubility parameters, and combinations of thereof.

Suitable FPCs may be highly volatile, low boiling, perfume ingredients. Exemplary FPC include iso-nonyl acetate, dihydro myrcenol (<NUM>-methylene-<NUM>-methyl octan-<NUM>-ol), linalool (<NUM>-hydroxy-<NUM>, <NUM>-dimethyl-<NUM>, <NUM> octadiene), geraniol (<NUM>, <NUM> dimethyl-<NUM>, <NUM>-octadien-<NUM>-ol), d-limonene (<NUM>-methyl-<NUM>-isopropenyl-<NUM>-cyclohexene, benzyl acetate, and combinations thereof.

The freshening composition may include one or more non-functional perfume components. A non-functional perfume component is a perfume raw material ("PRM") that is utilized solely for its fragrance, scent, or hedonic benefits. Non-functional perfume components do not satisfy the properties of a functional perfume component. Suitable non-functional perfume raw materials are disclosed in <CIT>; <CIT>; <CIT>; <CIT>; and <CIT>.

The freshening composition may include various different PRMs. Exemplary PRMs are listed in TABLE <NUM> below.

The freshening composition comprises greater than <NUM> wt. %, alternatively greater than <NUM> wt. %, alternatively greater than <NUM> wt. %, alternatively greater than <NUM> wt. %, alternatively greater than <NUM> wt. %, of perfume raw materials, based on the total weight of the freshening composition.

The freshening composition may include an active agent. Active agents provide cleaning, surface care protection, fabric conditioning or softening, fabric refreshing, de-wrinkling, air freshening, air deodorizing, malodor removal, skin moisturizing, body deodorizing, or like benefits. An active agent does not include water or deionized water.

In a freshening composition, the active agents may deliver a genuine malodor removal benefit. A genuine malodor removal benefit is defined as both a sensory and analytically measurable (such as by GC) malodor reduction. Thus, if the air freshening composition delivers a genuine malodor removal benefit, the air freshening composition will not function merely by using perfume to cover up or mask odors. If the air freshening product is provided with a malodor controlling agent, the air freshening product may utilize one or more of several types of odor control mechanisms. One suitable malodor controlling agent is cyclodextrin.

Active agents might also include surfactants, emulsifiers, solubilizers, polymers, malodor counteractants such as cyclodextrin, hydrogen peroxide, buffers, zinc ions, etc..

The freshening composition may be used with an air care product to deliver the non-functional perfume raw materials to the atmosphere and/or a surface. It is contemplated that the air care product may be configured for use in a variety of applications to deliver volatile materials to the atmosphere and/or a surface.

For example, the air care product may be configured as an energized device. An exemplary energized device may be an electrical device. The energized device may be an electrical wall plug or battery operated air freshener having a delivery engine, such as a wick, that is used to transport a freshening composition and/or evaporate a freshening composition therefrom; or other heating devices (e.g. devices powered by chemical reactions such as catalyst fuel systems; solar powered devices, etc.). In such devices, the delivery engine is designed to transport a freshening composition and/or evaporate a freshening composition therefrom. The energized device may also include a microfluidic die having either a heater(s) that are used to dispense droplets of the freshening composition into the air.

When the delivery engine is used to evaporate the freshening composition therefrom, the delivery engine may be placed next to one or more evaporative assistance elements, such as a heater, to disperse the freshening composition in the atmosphere.

The delivery engine may be configured in various ways. For example, the delivery engine may be in the form of a wick, membrane, gel, porous or semi-porous substrate, including a felt pad.

If the air freshener product includes a delivery engine in the form of a wick, the wick may be configured to have various different shapes and sizes. For example, the wick may have a cylindrical or an elongate cube shape. The wick may be defined by a length and a diameter or width, depending on the shape. The wick may have various lengths. For example, the length of the wick may be in the range of about <NUM> millimeter ("mm") to about <NUM>, or from about <NUM> to about <NUM>, or from about <NUM> to about <NUM>. The wick may have various diameters or widths. For example, diameter or width of the wick may be at least <NUM>, or at least <NUM>, or at least <NUM>, or at least <NUM>.

A wick may exhibit a density. The wick density may be in the range of about <NUM> grams/cm<NUM> ("g/cc") to about <NUM>/cc.

A wick may comprise a porous or semi-porous substrate. The wick may be composed of various materials and methods of construction, including, but not limited to, bundled fibers which are compressed and/or formed into various shapes via overwrap (such as a non-woven sheet overwrap) or made of sintered plastics such as PE, HDPE or other polyolefins. For example, the wick may be made from a plastic material such as polyethylene or a polyethylene blend.

Instead of evaporating the freshening composition from the delivery engine, the delivery engine may transport the freshening composition to a microfluidic die or an evaporative surface. For example, the delivery engine may transport the fluid composition, through capillary action, to a microfluidic die that uses a heater to atomize or disperse droplets of the freshening composition into the atmosphere.

The evaporative surface may be integral or separate from the evaporative assistance element and/or the delivery engine. The evaporative surface may be configured as a porous or semi-porous substrate, a bowl or plate, including a plastic, glass, or metal bowl or plate, and combinations thereof.

When an evaporative assistance element is used, the evaporative assistance element may be configured in various ways. The evaporative assistance element may be used to achieve the evaporation of a freshening composition from an air care product. The evaporative assistance element may be a heater. The evaporative assistance element may also include a heating element to heat the liquid volatile composition, a chemical constituent to speed evaporation or release rates, use of a chemically heated membrane to provide increased evaporation via exothermic reaction, or synergistic combinations thereof.

An energized device having an evaporative assistance element in the form of a heater may be configured to heat the delivery engine to various temperatures. For example, the energized device may be configured such that the heater heats the evaporative surface, such as a wick, membrane, gel, porous or semi-porous substrate such as a felt pad, to a temperature of about <NUM> to about <NUM>. An energized device may include a control system such that the heater temperature is adjustable. The control system may also cycle the heater temperature to have greater control over the evaporation of the freshening composition.

An exemplary energized device is shown in <FIG> in the form of an electrical wall plug air freshener <NUM>. The wall plug air freshener <NUM> may include a housing <NUM>, and the housing <NUM> is supported on an electrical outlet by a plug <NUM> that is at least indirectly joined to the housing <NUM>. The air freshener <NUM> further comprises at least one reservoir <NUM> for containing the freshening composition. The housing <NUM> may serve as a holder for the reservoir(s) and any of the other components of the air freshener. The air freshener comprises a delivery engine in the form of a wick <NUM> and an evaporative assistance element in the form of a heater <NUM> for dispensing the volatile material. While <FIG> illustrates one reservoir, one evaporative assistance element, and one delivery engine, it is to be appreciated that the air freshener may include more than one reservoir, evaporative assistance element, and/or delivery engine. If the air freshener includes more than one reservoir, each reservoir may contain a different freshening composition or may contain the same freshening composition.

<FIG> illustrates a cartridge <NUM> of an exemplary air care product comprising a microfluidic die. A cartridge <NUM> comprising a microfluidic die, such as shown in <FIG>, may include a reservoir <NUM> for containing the freshening composition, a delivery engine in the work of a wick <NUM> that is in fluid communication with the reservoir <NUM> and the freshening composition contained with the reservoir <NUM>, and a microfluidic die <NUM>. The microfluidic die <NUM> may include a heater(s) that is used to atomization the freshening composition to dispense the freshening composition into the atmosphere. The cartridge may be connected with a housing that supplies electricity to the microfluidic die <NUM>.

An air care product as disclosed herein, but not currently claimed, may also be configured as a passive air diffuser apparatus that includes a breathable membrane for diffusing freshening composition.

For example, as shown in <FIG> and <FIG>, the apparatus <NUM> for delivering a freshening composition may comprise a delivery engine <NUM> having a liquid reservoir <NUM> for containing a freshening composition and a breathable membrane <NUM> enclosing the liquid reservoir <NUM>, such as disclosed in <CIT> and <CIT>. A breathable membrane <NUM> is a vapor permeable membrane that prevents free flow of liquid out of the membrane, thus addressing leakage problems. Suitable membranes include, but are not limited to, UHMWPE-type membrane optionally filled with silica as described in <CIT>. Such UHMWPE membranes include Daramic™ V5, available from Daramic, Solupor®, available from DSM (Netherlands), and Teslin™ SP1100HD, available from PPG Industries, and combinations thereof. Other suitable breathable membranes include any permeable polymeric, thermoplastic, or thermoset material, including acetal, acrylic, cellulosic, fluoroplastic, polyamide, polyester, polyvinyl, polyolefin, styrenic, etc, alone, co-extruded, woven or non-woven, mixed or in combination with elastomers, rubber, solids, silicas, or combinations thereof. Also suitable are Hytrel™ available from Dupont or Lotryl™ available from Arkema. The delivery engine <NUM>, such as shown in <FIG>, may also include a rupturable substrate <NUM> that seals the freshening composition in the liquid reservoir until a rupture mechanism <NUM> is engaged to when the apparatus is to be used by the consumer. When the consumer is ready to use the apparatus, the consumer can rupture the rupturable substrate <NUM> with the rupture mechanism <NUM>, which allows the freshening composition in the liquid reservoir <NUM> to contact the breathable membrane.

The air care product may not be in the form of an on-demand or spray product such as an aerosol or mechanical spray product as the benefits of isopropyl myristate in the freshening composition will not be realized in an on-demand type product.

Method: The data contained herein consists of evaporative weight-loss, or stated another way, the cumulative daily loss of weight from a delivery engine as expressed in terms of mg/day ("weight-loss"). To determine the weight-loss through evaporation the freshening composition which is evaporating is weighed on a regular basis and at any point in time, the total mg/day evaporated is calculated by comparing the weights from two adjacent time points as well as the time that has elapsed between the aforementioned points at which the weight was recorded: <MAT> <MAT> <MAT> <MAT> <MAT>.

"Example A" - The freshening compositions of Example A were evaporated from an AMBI PUR™ diffuser having a single wick (~<NUM> exposed wick length, ~<NUM> diameter) while plugged in for <NUM> hours per day. The freshening compositions were evaporated until at least <NUM>% of the liquid freshening composition had been exhausted from the reservoir. For Example A, the only variable in the freshening compositions is the change in concentration of IPM. The freshening compositions tested in Example A are shown below in TABLE <NUM>. The "+<NUM>% IPM" freshening composition has a vapor pressure at <NUM> of about <NUM> Torr. The evaporative weight-loss results of Example A are shown in <FIG>.

As shown in <FIG>, the addition of IPM at <NUM> wt. % and <NUM> wt. % significantly increased the elapsed evaporation time of the freshening compositions of Example A.

"Example B" - The freshening compositions of Example B were individually evaporated from an AMBI PUR™ diffuser having a single heated wick (~<NUM> exposed wick length, ~<NUM> diameter) while plugged in for <NUM> hours per day. The freshening compositions were evaporated until at least <NUM>% of the liquid freshening compositions had been exhausted from the reservoir.

For Example B, the only variable in the freshening compositions is the change in concentration of IPM. The freshening compositions tested in Example B are shown below in TABLE <NUM>. The "+<NUM> % IPM" freshening composition has a vapor pressure at <NUM> of about <NUM> Torr. The evaporative weight-loss results of Example B are shown in <FIG>.

As shown in <FIG>, the addition of IPM at <NUM> wt. % and <NUM> wt. % significantly increased the elapsed evaporation time of the freshening compositions of Example B.

"Example C" - Example C is not as currently claimed. The freshening compositions of Example C were individually evaporated from an AMBI PUR™ diffuser having a single heated wick (~<NUM> exposed wick length, ~<NUM> diameter) while plugged in for <NUM> hours per day. The freshening compositions were evaporated until at least <NUM>% of the liquid freshening compositions had been exhausted from the reservoir. For Example C, the only variable in the freshening compositions is the change in concentration of IPM. The freshening compositions tested in Example C are shown below in TABLE <NUM>. The "<NUM>% IPM" freshening composition has a vapor pressure at <NUM> of about <NUM> Torr. The evaporative weight-loss results of Example C are shown in <FIG>.

As shown in <FIG>, the addition of <NUM> wt. % IPM and <NUM> wt. % IPM increased the elapsed evaporation time of the freshening compositions of Example C. With the addition of <NUM> wt. % IPM, <FIG> illustrates that the benefit of IPM levels off, as the results are comparable to the <NUM> wt.

"Example D" - Example D is not as currently claimed. The freshening compositions of Example D were individually evaporated from an AMBI PUR™ diffuser having three heated wicks (~<NUM> exposed wick length/<NUM> diameter) while plugged in for <NUM> hours per day. The freshening compositions were evaporated for sufficient time so as to either attain "end of life," as detailed in the graph below, or until sufficient evaporative data had been collected. For Example D, the only variable in the freshening compositions is the change in concentration of IPM. The freshening compositions tested in Example D are shown below in TABLE <NUM>. The "<NUM>% IPM" freshening composition has a vapor pressure at <NUM> of about <NUM> Torr. The evaporative weight-loss results of Example D are shown in <FIG>.

As shown in <FIG>, the addition of <NUM> wt. % IPM and <NUM> wt. % IPM increased the elapsed evaporation time of the freshening compositions of Example D. With the addition of <NUM> wt. % IPM, <FIG> illustrates that the benefit of IPM levels off, as the results are comparable to the <NUM> wt.

"Example E" - The freshening compositions of Example E were individually evaporated from an AMBI PUR™ diffuser having a single wick (~<NUM> exposed wick length, ~<NUM> diameter) while plugged in for <NUM> hours per day. The freshening compositions were evaporated for sufficient time so as to either attain "end of life," as detailed in the graph below, or until sufficient evaporative data had been collected. For Example E, the non-functional perfume raw material portion of the freshening composition accounts for <NUM>% of the total freshening composition. The remaining balance of <NUM>% of the freshening compositions consists only carrier materials, specifically DOWANOL™ TPM and "IPM. " The freshening compositions tested in Example E are shown below in TABLE <NUM>. The "+<NUM>% IPM" freshening composition has a vapor pressure at <NUM> of about <NUM> Torr. The evaporative weight-loss results of Example E are shown in <FIG>. The embodiments with +<NUM>% IPM, and +<NUM>% IPM compositions are not as currently claimed.

<FIG> shows the evaporation profile of the freshening compositions of Example E. The +<NUM>% IPM, +<NUM>% IPM, +<NUM>% IPM, and +<NUM>% IPM compositions were evaluated over a <NUM>-day period, while the <NUM>% IPM composition was evaluated over a <NUM>-day period. The elapsed evaporation time would extend significantly past the <NUM>-day period that the compositions were tested. Thus, <FIG> illustrates that the addition of low levels of IPM dramatically increases the elapsed evaporation time of the freshening compositions, even at low overall carrier levels and high non-functional perfume raw material levels.

Values disclosed herein as ends of ranges are not to be understood as being strictly limited to the exact numerical values recited. Instead, unless otherwise specified, each numerical range is intended to mean both the recited values, any integers within the specified range, and any ranges with the specified range. For example a range disclosed as "<NUM> to <NUM>" is intended to mean "<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>.

Claim 1:
An air freshener product comprising:
a liquid freshening composition comprising <NUM> wt. % to <NUM> wt. % isopropyl myristate and greater than <NUM> wt. % of one or more perfume raw materials, by weight of the liquid freshening composition,
wherein the liquid freshening composition has a vapor pressure at <NUM> of <NUM>,<NUM> Pa (<NUM> Torr) to <NUM> Pa (<NUM> Torr);
a reservoir for containing the liquid freshening composition;
a delivery engine in fluid communication with the freshening composition, wherein the delivery engine is selected from the group consisting of: wick, gels, porous and semi-porous substrate, and combinations thereof; and
further comprising a heater, wherein the heater is configured to heat the delivery engine to a temperature in the range of <NUM> to <NUM>.