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US20180220697A1 - Methods and systems for improving stability of pre-vapor formulations of e-vaping devices - Google Patents

Methods and systems for improving stability of pre-vapor formulations of e-vaping devices Download PDF

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Publication number
US20180220697A1
US20180220697A1 US15/423,699 US201715423699A US2018220697A1 US 20180220697 A1 US20180220697 A1 US 20180220697A1 US 201715423699 A US201715423699 A US 201715423699A US 2018220697 A1 US2018220697 A1 US 2018220697A1
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US
United States
Prior art keywords
compound
vapor formulation
equal
weight
vapor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
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US15/423,699
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English (en)
Inventor
Marc W. Fariss
Michael J. Oldham
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Altria Client Services LLC
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Altria Client Services LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Altria Client Services LLC filed Critical Altria Client Services LLC
Priority to US15/423,699 priority Critical patent/US20180220697A1/en
Assigned to ALTRIA CLIENT SERVICES LLC reassignment ALTRIA CLIENT SERVICES LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FARISS, MARC W, Oldham, Michael J
Priority to PCT/EP2018/052717 priority patent/WO2018141941A2/en
Priority to CN201880006151.4A priority patent/CN110167365B/zh
Priority to JP2019531215A priority patent/JP7208899B2/ja
Priority to RU2019127181A priority patent/RU2751668C2/ru
Priority to MX2019008845A priority patent/MX2019008845A/es
Priority to CA3041189A priority patent/CA3041189A1/en
Priority to EP18703309.7A priority patent/EP3576552A2/en
Priority to KR1020197019108A priority patent/KR102649834B1/ko
Publication of US20180220697A1 publication Critical patent/US20180220697A1/en
Priority to IL268072A priority patent/IL268072A/en
Abandoned legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B15/00—Chemical features or treatment of tobacco; Tobacco substitutes, e.g. in liquid form
    • A24B15/10—Chemical features of tobacco products or tobacco substitutes
    • A24B15/16—Chemical features of tobacco products or tobacco substitutes of tobacco substitutes
    • A24B15/167—Chemical features of tobacco products or tobacco substitutes of tobacco substitutes in liquid or vaporisable form, e.g. liquid compositions for electronic cigarettes
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/10—Devices using liquid inhalable precursors
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24F—SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES
    • A24F40/00—Electrically operated smoking devices; Component parts thereof; Manufacture thereof; Maintenance or testing thereof; Charging means specially adapted therefor
    • A24F40/40—Constructional details, e.g. connection of cartridges and battery parts
    • A24F47/008—

Definitions

  • Some example embodiments relate to pre-vapor formulations of electronic vaping devices.
  • E-vaping devices also referred to herein as electronic vaping devices (EVDs) may vaporize a pre-vapor formulation that may be drawn through one or more outlets of the e-vaping device.
  • An e-vaping device may typically include several e-vaping elements including a power supply section and a cartridge.
  • the power supply section may include a power source such as a battery
  • the cartridge may include a heater along with a reservoir capable of holding pre-vapor formulation material.
  • the cartridge typically includes the heater in fluid communication with the pre-vapor formulation via a dispensing interface (e.g., a wick), the heater being configured to heat the pre-vapor formulation to generate a vapor.
  • a dispensing interface e.g., a wick
  • the pre-vapor formulation typically includes a material or combination of materials that may be transformed into a vapor.
  • the pre-vapor formulation may include a liquid, solid and/or gel formulation including, but not limited to, water, beads, solvents, active ingredients, ethanol, plant extracts, natural flavors and/or artificial flavors.
  • Solvents may include at least one of glycerin and propylene glycol.
  • ingredients of the pre-vapor formulation in the pre-vapor formulation container may react with other ingredients, with other elements, or with solid metallic parts of the pre-vapor formulation container or cartridge.
  • ingredients of the pre-vapor formulation may react with the metal(s) of the solid portions of the e-vaping device, such as copper or iron, in the presence of oxygen and generate free radicals such as, for example, hydroxyl radicals.
  • metal ions such as, for example, copper ions Cu 2+ , may react with oxygen or hydrogen peroxide.
  • the free radicals may be generated via oxidation of the metallic portions of the cartridge or pre-vapor formulation container.
  • the oxidation of pre-vapor formulation ingredients, the cartridge or the container is typically dependent on the presence of oxygen and a redox-active transition metal producing oxygen species such as hydroxyl radicals.
  • the redox-active transition metal may come from metallic portions of the cartridge or container, or may be contained in other elements added to the pre-vapor formulation such as nicotine, water, vapor formers such as glycerin and/or propylene glycol, acids, flavorants and/or aromas.
  • the free (e.g., hydroxyl) radicals may react with ingredients of the pre-vapor formulation, resulting in a decrease of the stability of the pre-vapor formulation.
  • the free radicals may also mix with the vapor generated by the e-vaping device.
  • Some example embodiments relate to a pre-vapor formulation of an e-vaping device.
  • a pre-vapor formulation of an e-vaping device may include a solvent that includes at least one of propylene glycol and glycerin and a solution compound.
  • the solution compound may be at least one of a saccharide compound, a salt solution, and a polyethylene glycol compound.
  • a concentration of the saccharide compound in the pre-vapor formulation may be greater than 0 M and equal to or less than 2.5 M.
  • the saccharide compound may include at least one of a monosaccharide compound, a disaccharide compound, a trisaccharide compound, and a polyol compound.
  • the polyol compound may include at least one of mannitol, erythritol, xylitol, and sorbitol.
  • a concentration of the polyol compound in the pre-vapor formulation may be equal to or greater than about 0.2% and may be equal to or less than about 10% by weight based on the weight of the pre-vapor formulation.
  • a concentration of the polyol compound in the pre-vapor formulation may be equal to or greater than about 0.2% and may be equal to or less than about 5% by weight based on the weight of the pre-vapor formulation.
  • a concentration of the polyol compound in the pre-vapor formulation may be equal to or greater than about 5% and may be equal to or less than about 8% by weight based on the weight of the pre-vapor formulation.
  • a concentration of the polyol compound in the pre-vapor formulation may be equal to or greater than about 8% and may be equal to or less than about 10% by weight based on the weight of the pre-vapor formulation.
  • the salt solution may include at least one of sodium chloride, sodium citrate, sodium tartrate, sodium succinate, sodium sulfate, calcium chloride, magnesium chloride, magnesium sulfate, and potassium sulfate.
  • a concentration of the salt solution in the pre-vapor formulation may be greater than 0% and may be equal to or less than 10% by weight based on the weight of the pre-vapor formulation.
  • the polyethylene glycol (PEG) compound may include at least one of PEG 200, PEG 300, and PEG 400.
  • a concentration of the polyethylene glycol compound in the pre-vapor formulation may be greater than about 0% and may be equal to or less than about 50% by weight based on the weight of the pre-vapor formulation.
  • a cartridge for an e-vaping device may include a reservoir holding the aforementioned pre-vapor formulation; and a heater configured to heat the aforementioned pre-vapor formulation.
  • an e-vaping device may include the aforementioned cartridge and a power supply section coupled to the cartridge.
  • the power supply section may be configured to supply electrical power to the heater of the cartridge.
  • the power supply section may include a rechargeable battery.
  • the cartridge and the power supply section may be removably coupled together.
  • FIG. 1 is a side view of an e-vaping device, according to some example embodiments.
  • FIG. 2 is a longitudinal cross-sectional view of an e-vaping device, according to some example embodiments
  • FIG. 3 is a longitudinal cross-sectional view of an e-vaping device, according to some example embodiments.
  • FIG. 4 is a longitudinal cross-sectional view of an e-vaping device, according to some example embodiments.
  • first, second, third, etc. may be used herein to describe various elements, regions, layers and/or sections, these elements, regions, layers, and/or sections should not be limited by these terms. These terms are only used to distinguish one element, region, layer, or section from another region, layer, or section. Thus, a first element, region, layer, or section discussed below could be termed a second element, region, layer, or section without departing from the teachings of example embodiments.
  • spatially relative terms e.g., “beneath,” “below,” “lower,” “above,” “upper,” and the like
  • the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the term “below” may encompass both an orientation of above and below.
  • the device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
  • example embodiments are described herein with reference to cross-sectional illustrations that are schematic illustrations of idealized embodiments (and intermediate structures) of example embodiments. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, example embodiments should not be construed as limited to the shapes of regions illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the actual shape of a region of a device and are not intended to limit the scope of example embodiments.
  • tubular elements of the embodiments may be cylindrical, other tubular cross-sectional forms are contemplated, such as square, rectangular, oval, triangular and others.
  • vapor former describes any suitable known compound or mixture of compounds that, in use, facilitates formation of a vapor and that is substantially resistant to thermal degradation at the operating temperature of the e-vaping device.
  • Suitable vapor formers may include various compositions of polyhydric alcohols such as propylene glycol and/or glycerin or glycerin.
  • the vapor former is propylene glycol.
  • the vapor former is included in a solvent of a pre-vapor formulation.
  • FIG. 1 is a side view of an e-vaping device 60 , according to some example embodiments.
  • the e-vaping device 60 may include one or more of the features set forth in U.S. Patent Application Publication No. 2013/0192623 to Tucker et al. filed Jan. 31, 2013 and U.S. Patent Application Publication No. 2013/0192619 to Tucker et al. filed Jan. 14, 2013, the entire contents of each of which are incorporated herein by reference thereto.
  • FIG. 1 is a side view of an e-vaping device 60 , according to some example embodiments.
  • the e-vaping device 60 may include one or more of the features set forth in U.S. Patent Application Publication No. 2013/0192623 to Tucker et al. filed Jan. 31, 2013 and U.S. Patent Application Publication No. 2013/0192619 to Tucker et al. filed Jan. 14, 2013, the entire contents of each of which are incorporated herein by reference thereto.
  • the e-vaping device 60 includes a first section (or cartridge) 70 and a second section (or power supply section) 72 , which are coupled together at a threaded joint 74 or by other connecting structure such as a snug-fit, snap-fit, detent, clamp and/or clasp or the like.
  • the cartridge 70 and the power supply section 72 may be configured to be reversibly coupled together.
  • the first section or cartridge 70 may be a replaceable cartridge, and the power supply section 72 may be a reusable section.
  • the first section or cartridge 70 and the power supply section 72 may be integrally formed in one piece.
  • the power supply section 72 includes a light emitting diode (LED) at a distal end 28 thereof.
  • LED light emitting diode
  • FIG. 2 is a cross-sectional view of some example embodiments of an e-vaping device.
  • the first section or cartridge 70 can house an outlet-end insert 20 , a capillary tube 18 , and a reservoir 14 .
  • the reservoir 14 may include a wrapping of gauze about an inner tube (not shown).
  • the reservoir 14 may be formed of (e.g., at least partially comprise, include, etc.) an outer wrapping of gauze surrounding an inner wrapping of gauze.
  • the reservoir 14 may include an alumina ceramic in the form of loose particles, loose fibers, or woven or nonwoven fibers.
  • the reservoir 14 include a cellulosic material such as cotton or gauze material, or a polymer material, such as polyethylene terephthalate, in the form of a bundle of loose fibers. A more detailed description of the reservoir 14 is provided below.
  • the reservoir 14 is configured to hold one or more pre-vapor formulations.
  • one or more pre-vapor formulations held within the reservoir 14 may include a solvent and a solution compound.
  • the solvent may include at least one of propylene glycol (PG) and glycerin (Gly).
  • the solution compound may include at least one of a saccharide compound, a salt solution, and a polyethylene glycol (PEG) compound.
  • a pre-vapor formulation is a material or combination of materials that may be transformed into a vapor.
  • the pre-vapor formulation may be a liquid, solid and/or gel formulation including, but not limited to, water, beads, solvents, active ingredients, ethanol, plant extracts, and/or natural or artificial flavors.
  • Different pre-vapor formulations may include different elements (e.g., different compounds, substances, etc.).
  • Different pre-vapor formulations may have different properties.
  • One or more of pre-vapor formulations may include those described in U.S. Patent Application Publication No. 2015/0020823 to Lipowicz et al. filed Jul. 16, 2014 and U.S. Patent Application Publication No. 2015/0313275 to Anderson et al. filed Jan. 21, 2015, the entire contents of each of which is incorporated herein by reference thereto.
  • the power supply section 72 may include a power supply 12 , control circuitry 11 configured to control the power supply 12 , and a sensor 16 .
  • the sensor 16 may be configured to be responsive to air drawn into the power supply section 72 through an air inlet port (not shown) adjacent to a free end or tip end (e.g., distal end 28 ) of the e-vaping device 60 .
  • the sensor 16 may be coupled to control circuitry 11 .
  • the power supply 12 may include a rechargeable battery.
  • the sensor 16 may be one or more of a pressure sensor, a microelectromechanical system (MEMS) sensor, etc.
  • MEMS microelectromechanical system
  • a threaded portion of the power supply section 72 (e.g., at least a portion of the threaded joint 74 ) can be connected to a battery charger, when not connected to the first section or cartridge 70 , to charge the battery or power supply 12 included in the power supply section 72 .
  • the capillary tube 18 is formed of or includes a conductive material, and thus may be configured to be its own heater (e.g., may include a heater) by passing current through the capillary tube 18 .
  • the capillary tube 18 may be any electrically conductive material capable of being heated, for example resistively heated, while retaining structural integrity at the operating temperatures experienced by the capillary tube 18 , and which is non-reactive with the pre-vapor formulation.
  • Suitable materials for forming the capillary tube 18 are one or more of stainless steel, copper, copper alloys, porous ceramic materials coated with film resistive material, nickel-chromium alloys, and combinations thereof.
  • the capillary tube 18 is a stainless steel capillary tube 18 and serves as a heater via electrical leads 26 attached thereto for passage of direct or alternating current along a length of the capillary tube 18 .
  • the stainless steel capillary tube 18 is heated by, for example, resistance heating.
  • the capillary tube 18 may be a non-metallic tube such as, for example, a glass tube.
  • the capillary tube 18 also includes a conductive material such as, for example, stainless steel, nichrome or platinum wire, arranged along the glass tube and capable of being heated, for example resistively. When the conductive material arranged along the glass tube is heated, pre-vapor formulation present in the capillary tube 18 is heated to a temperature sufficient to at least partially volatilize pre-vapor formulation in the capillary tube 18 .
  • the electrical leads 26 are bonded to the metallic portion of the capillary tube 18 .
  • one electrical lead 26 is coupled to a first, upstream portion 101 of the capillary tube 18 and a second electrical lead 26 is coupled to a downstream, end portion 102 of the capillary tube 18 .
  • the senor 16 detects a pressure gradient, and the control circuitry 11 controls heating of the pre-vapor formulation located in the reservoir 14 by providing power to the capillary tube 18 .
  • the pre-vapor formulation contained within a heated portion of the capillary tube 18 is volatilized and emitted from the outlet 63 , where the pre-vapor formulation expands and mixes with air and forms a vapor in mixing chamber 240 .
  • the sensor 16 is configured to generate an output indicative of a magnitude and direction of airflow in the e-vaping device 60 .
  • the control circuitry 11 receives the output of the sensor 16 , and determines if (1) a direction of the airflow in flow communication with the sensor 16 indicates a draw on the outlet-end insert 20 (e.g., a flow through the outlet-end insert 20 towards an exterior of the e-vaping device 60 from an interior of the e-vaping device 60 ) versus blowing (e.g., a flow through the outlet-end insert 20 from an exterior of the e-vaping device 60 towards the interior of the e-vaping device 60 ) and (2) the magnitude of the draw (e.g., flow velocity, volumetric flow rate, mass flow rate, some combination thereof, etc.) exceeds a threshold level.
  • a direction of the airflow in flow communication with the sensor 16 indicates a draw on the outlet-end insert 20 (e.g., a flow through the outlet-end insert 20 towards an exterior of the
  • control circuitry 11 may electrically connect the power supply 12 to a heater (e.g., heater 19 in FIG. 4 , a stainless steel capillary tube 18 coupled to electrical leads 26 , etc.), thereby activating (e.g., supplying electrical power to) the heater.
  • a heater e.g., heater 19 in FIG. 4 , a stainless steel capillary tube 18 coupled to electrical leads 26 , etc.
  • control circuitry 11 may selectively electrically connect the electrical leads 26 in a closed electrical circuit (e.g., by activating a heater power control circuit included in the control circuitry 11 ) such that the heater becomes electrically connected to the power supply 12 and the power supply 12 supplies electrical power to the heater.
  • the sensor 16 may indicate a pressure drop, and the control circuitry 11 may activate the heater in response thereto.
  • control circuitry 11 may include a time-period limiter. In some example embodiments, the control circuitry 11 may include a manually operable switch for an adult vaper to initiate heating. The time-period of the electric current supply to the heater may be set or pre-set depending on the amount of pre-vapor formulation desired to be vaporized. In some example embodiments, the sensor 16 may detect a pressure drop and the control circuitry 11 may supply power to the heater as long as heater activation conditions are met.
  • Such conditions may include one or more of the sensor 16 detecting a pressure drop that at least meets a threshold magnitude, the control circuitry 11 determining that a direction of the airflow in flow communication with the sensor 16 indicates a draw on the outlet-end insert 20 versus blowing, and the magnitude of the draw (e.g., flow velocity, volumetric flow rate, mass flow rate, some combination thereof, etc.) exceeds a threshold level.
  • the magnitude of the draw e.g., flow velocity, volumetric flow rate, mass flow rate, some combination thereof, etc.
  • control circuitry 11 may execute one or more instances of computer-executable program code.
  • the control circuitry 11 may include a processor and a memory.
  • the memory may be a computer-readable storage medium storing computer-executable code.
  • the control circuitry 11 may include processing circuity including, but not limited to, a processor, Central Processing Unit (CPU), a controller, an arithmetic logic unit (ALU), a digital signal processor, a microcomputer, a field programmable gate array (FPGA), a System-on-Chip (SoC), a programmable logic unit, a microprocessor, or any other device capable of responding to and executing instructions in a defined manner.
  • the control circuitry 11 may be at least one of an application-specific integrated circuit (ASIC) and an ASIC chip.
  • ASIC application-specific integrated circuit
  • the control circuitry 11 may be configured as a special purpose machine by executing computer-readable program code stored on a storage device.
  • the program code may include program or computer-readable instructions, software elements, software modules, data files, data structures, and/or the like, capable of being implemented by one or more hardware devices, such as one or more of the control circuitry mentioned above. Examples of program code include both machine code produced by a compiler and higher level program code that is executed using an interpreter.
  • the control circuitry 11 may include one or more electronic storage devices.
  • the one or more storage devices may be tangible or non-transitory computer-readable storage media, such as random access memory (RAM), read only memory (ROM), a permanent mass storage device (such as a disk drive), solid state (e.g., NAND flash) device, and/or any other like data storage mechanism capable of storing and recording data.
  • the one or more storage devices may be configured to store computer programs, program code, instructions, or some combination thereof, for one or more operating systems and/or for implementing the example embodiments described herein.
  • the computer programs, program code, instructions, or some combination thereof may also be loaded from a separate computer readable storage medium into the one or more storage devices and/or one or more computer processing devices using a drive mechanism.
  • Such separate computer readable storage medium may include a USB flash drive, a memory stick, a Blu-ray/DVD/CD-ROM drive, a memory card, and/or other like computer readable storage media.
  • the computer programs, program code, instructions, or some combination thereof may be loaded into the one or more storage devices and/or the one or more computer processing devices from a remote data storage device through a network interface, rather than through a local computer readable storage medium. Additionally, the computer programs, program code, instructions, or some combination thereof, may be loaded into the one or more storage devices and/or the one or more processors from a remote computing system that is configured to transfer and/or distribute the computer programs, program code, instructions, or some combination thereof, over a network.
  • the remote computing system may transfer and/or distribute the computer programs, program code, instructions, or some combination thereof, through a wired interface, an air interface, and/or any other like medium.
  • the control circuitry 11 may be a special purpose machine configured to execute the computer-executable code to control the supply of electrical power to a heater of the e-vaping device.
  • an instance of computer-executable code when executed by the control circuitry 11 , causes the control circuitry 11 to control the supply of electrical power to a heater according to an activation sequence. Controlling the supply of electrical power to a heater may be referred to herein interchangeably as activating the heater, activating one or more elements included in the heater, some combination thereof, or the like.
  • the reservoir 14 includes a valve 40 configured to maintain the pre-vapor formulation within the reservoir 14 and to open when the reservoir 14 is squeezed and pressure is applied thereto, the pressure being created when an adult vaper draws on the e-vaping device at the outlet-end insert 20 , which results in the reservoir 14 forcing the pre-vapor formulation through the outlet 62 of the reservoir 14 to the capillary tube 18 .
  • the valve 40 opens when a particular pressure is reached so as to avoid inadvertently dispensing pre-vapor formulation from the reservoir 14 .
  • the pressure associated with pressing the pressure switch 44 is high enough such that accidental heating due to the pressure switch 44 being inadvertently pressed by outside factors such as physical movement or collision with outside objects is avoided.
  • the power supply 12 of some example embodiments may include a battery arranged in the power supply section 72 of the e-vaping device 60 .
  • the power supply 12 may be configured to apply a voltage to volatilize the pre-vapor formulation housed in the reservoir 14 .
  • the electrical connection between the capillary tube 18 and the electrical leads 26 is substantially conductive and temperature resistant while the capillary tube 18 is substantially resistive so that heat generation occurs primarily along the capillary tube 18 and not at the contacts.
  • the power supply (or battery) 12 may be rechargeable and include circuitry configured to enable the battery to be chargeable by an external charging device.
  • the circuitry when charged, provides power for a given quantity of instances of vapor being drawn through one or more outlets of the e-vaping device 60 , negative pressure being applied to an interior of the e-vaping device through one or more outlets 21 , some combination thereof, or the like, after which the circuitry may have to be re-connected to an external charging device.
  • the e-vaping device 60 may include control circuitry 11 which can be, for example, on a printed circuit board.
  • the control circuitry 11 may also include a heater activation light 27 that is configured to glow when the device is activated.
  • the heater activation light 27 may include a light emitting diode (LED).
  • the heater activation light 27 may be arranged to be visible to an adult vaper during vaping.
  • the heater activation light 27 may be utilized for e-vaping system diagnostics or to indicate that recharging is in progress.
  • the heater activation light 27 may also be configured such that the adult vaper may activate and/or deactivate the heater activation light 27 for privacy.
  • the heater activation light 27 may be located on the tip end of the e-vaping device 60 . In some example embodiments, the heater activation light 27 may be located on a side portion of the outer housing of the e-vaping device 60 .
  • the e-vaping device 60 further includes an outlet-end insert 20 having at least two off-axis, diverging outlets 21 that are uniformly distributed around the outlet-end insert 20 so as to substantially uniformly distribute vapor from the e-vaping device 60 during operation of the e-vaping device 60 .
  • the outlet-end insert 20 includes at least two diverging outlets 21 (e.g., 3 to 8 outlets or more).
  • the outlets 21 of the outlet-end insert 20 are located at ends of off-axis passages 23 and are angled outwardly in relation to the longitudinal direction of the e-vaping device 60 (e.g., divergently).
  • the term “off-axis” denotes an angle to the longitudinal direction of the e-vaping device.
  • the e-vaping device 60 may be about 80 mm to about 110 mm long, for example about 80 mm to about 100 mm long and about 7 mm to about 10 mm in diameter.
  • the outer cylindrical housing 22 of the e-vaping device 60 may be formed of or include any suitable material or combination of materials.
  • the outer cylindrical housing 22 is formed at least partially of metal and is part of the electrical circuit connecting the control circuitry 11 , the power supply 12 and the sensor 16 .
  • the e-vaping device 60 can also include a middle section (third section) 73 , which can house the reservoir 14 and the capillary tube 18 .
  • the middle section 73 can be configured to be fitted with a threaded joint 74 ′ at an upstream end of the first section or cartridge 70 and a threaded joint 74 at a downstream end of the power supply section 72 .
  • the first section or cartridge 70 houses the outlet-end insert 20
  • the power supply section 72 houses the power supply 12 and the control circuitry 11 that is configured to control the power supply 12 .
  • FIG. 3 is a cross-sectional view of an e-vaping device according to some example embodiments.
  • the first section or cartridge 70 is replaceable so as to avoid the need for cleaning the capillary tube 18 .
  • the first section or cartridge 70 and the power supply section 72 may be integrally formed without threaded connections to form a disposable e-vaping device.
  • a valve 40 can be a two-way valve, and the reservoir 14 can be pressurized.
  • the reservoir 14 can be pressurized using a pressurization arrangement 405 configured to apply constant pressure to the reservoir 14 .
  • emission of vapor formed via heating of the pre-vapor formulation housed in the reservoir 14 is facilitated.
  • the valve 40 closes and the heated capillary tube 18 discharges any pre-vapor formulation remaining downstream of the valve 40 .
  • FIG. 4 is a longitudinal cross-sectional view of an e-vaping device according to some example embodiments.
  • the e-vaping device 60 may include a central air passage 24 in an upstream seal 15 .
  • the central air passage 24 opens to a central channel 68 at least partially defined by an inner surface of the inner tube 65 .
  • the e-vaping device 60 may include a reservoir 14 configured to store the pre-vapor formulation.
  • the reservoir 14 includes the pre-vapor formulation and optionally a storage medium 25 such as gauze configured to store the pre-vapor formulation therein.
  • the reservoir 14 is contained in an outer annulus between the outer tube 6 and the inner tube 65 .
  • the annulus is sealed at an upstream end by the seal 15 and by a stopper 10 at a downstream end so as to prevent leakage of the pre-vapor formulation from the reservoir 14 .
  • the heater 19 at least partially surrounds a central portion of a wick 220 such that when the heater is activated, the pre-vapor formulation present in the central portion of the wick 220 is vaporized to form a vapor.
  • the heater 19 is connected to the power supply 12 by two spaced apart electrical leads 26 , such that the power supply 12 is configured to supply electrical power to the heater 19 to cause the heater 19 to vaporize at least a portion of the pre-vapor formulation drawn from the reservoir 14 into the wick 220 .
  • the e-vaping device 60 further includes an outlet-end insert 20 having at least two outlets 21 .
  • the outlet-end insert 20 is in fluid communication with the central air passage 24 via the interior of inner tube 65 (e.g., central channel 68 ) and a central passage 64 , which extends through the stopper 10 .
  • the e-vaping device 60 may include an air flow diverter comprising an impervious plug 30 at a downstream end 82 of the central air passage 24 in seal 15 .
  • the central air passage 24 is an axially extending central passage in seal 15 , which seals the upstream end of the annulus between the outer and inner tubes 6 , 65 .
  • the radial air channel 32 directing air from the central air passage 24 outward toward central channel 68 at least partially defined by the inner tube 65 .
  • the control circuitry 11 controls heating of the pre-vapor formulation located in the reservoir 14 by providing power to (e.g., supplying electrical power to) the heater 19 .
  • the reservoir 14 of a cartridge 70 that itself may be included in an e-vaping device 60 , is configured to hold one or more pre-vapor formulations.
  • a pre-vapor formulation is a material or combination of materials that may be transformed into a vapor.
  • the pre-vapor formulation may be a liquid, solid and/or gel formulation including, but not limited to, water, beads, solvents, active ingredients, ethanol, plant extracts, and/or natural or artificial flavors.
  • Different pre-vapor formulations may include different elements (e.g., different compounds, substances, etc.).
  • Different pre-vapor formulations may have different properties.
  • different pre-vapor formulations may have different viscosities when the different pre-vapor formulations are at a common temperature.
  • One or more of pre-vapor formulations may include those described in U.S. Patent Application Publication No. 2015/0020823 to Lipowicz et al. filed Jul. 16, 2014 and U.S. Patent Application Publication No. 2015/0313275 to Anderson et al. filed Jan. 21, 2015, the entire contents of each of which is incorporated herein by reference thereto.
  • a pre-vapor formulation may include a solvent and a solution compound.
  • a solvent may be referred to as a vapor former.
  • the solvent included in a pre-vapor formulation may include propylene glycol (PG), glycerin (Gly), water, some combination thereof, or the like.
  • the pre-vapor formulation includes at least one solution compound, in addition to a solvent.
  • the solution compound included in a pre-vapor formulation may include at least one of a saccharide compound, a salt solution, and a polyethylene glycol (PEG) compound.
  • the solution compound may include a saccharide compound.
  • the saccharide compound may be at least one of, for example, a monosaccharide compound, a disaccharide compound, and a trisaccharide compound. If and/or when the solution compound includes a monosaccharide compound, the monosaccharide compound may include at least one of, for example, a sugar acid compound, including gluconic acid, although example embodiments are not limited thereto. If and/or when the solution compound includes a disaccharide compound, the disaccharide compound may include at least one of, for example, trehalose, although example embodiments are not limited thereto.
  • the trisaccharide compound may include at least one of, for example, raffinose, although example embodiments are not limited thereto.
  • the polyol compound may include at least one of, for example, mannitol, erythritol, xylitol and sorbitol.
  • the saccharide compound may be included in the pre-vapor formulation in a concentration that is greater than about a molarity of 0 M and is equal to or less than a molarity of about 2.5 M.
  • the polyol compound may be included in the pre-vapor formulation at a concentration that is equal to or greater than about 0.2% and equal to or less than about 10% by weight based on the weight of the pre-vapor formulation. In some example embodiments, if and/or when the solution compound includes a polyol compound, the polyol compound may be included in the pre-vapor formulation at a concentration that is equal to or greater than about 0.2% and equal to or less than about 2% by weight based on the weight of the pre-vapor formulation.
  • the polyol compound may be included in the pre-vapor formulation at a concentration that is equal to or greater than about 2% and equal to or less than about 5% by weight based on the weight of the pre-vapor formulation. In some example embodiments, if and/or when the solution compound includes a polyol compound, the polyol compound may be included in the pre-vapor formulation at a concentration that is equal to or greater than about 5% and equal to or less than about 8% by weight based on the weight of the pre-vapor formulation.
  • the polyol compound may be included in the pre-vapor formulation at a concentration that is equal to or greater than about 8% and equal to or less than about 10% by weight based on the weight of the pre-vapor formulation.
  • the solution compound may include a salt solution.
  • the salt solution may include at least one of, for example, sodium chloride, sodium citrate, sodium tartrate, sodium succinate, sodium sulfate, calcium chloride, magnesium chloride, magnesium sulfate, and potassium sulfate.
  • the salt solution may be included in the pre-vapor formulation in a concentration that is greater than about 0% and is equal to or less than about 10% by weight based on the weight of the pre-vapor formulation.
  • the solution compound may include a polyethylene glycol compound.
  • the polyethylene glycol (PEG) compound may include at least one of, for example, PEG 200, PEG 300, and PEG 400.
  • the polyethylene glycol compound may be included in the pre-vapor formulation in a concentration that is greater than about 0% and is equal to or less than about 50% by weight based on the weight of the pre-vapor formulation.
  • the solution compound may include at least one of nicotine, one or more flavorants, one or more organic acids (e.g., organic acid compounds), water, and the like.
  • the solution compound may increase the stability of one or more various additional elements included in the pre-vapor formulation; may reduce or substantially prevent the oxidation of one or more solid portions of the e-vaping device 60 , such as the cartridge, that may come in contact with one or more elements of the pre-vapor formulation; may substantially prevent the transfer of free radicals including hydroxyl radicals into the vapor generated by the e-vaping device 60 ; may adjust tonicity of the pre-vapor formulation (e.g., a relative concentration of solutes included in the pre-vapor formulation with regard to one or more fluids), may adjust osmotic concentration (e.g., osmolarity) of the pre-vapor formulation; may adjust osmotic pressure of the pre-vapor formulation; may adjust osmolality of the pre-vapor formulation; some combination thereof, or the like.
  • tonicity of the pre-vapor formulation e.g., a relative concentration of solutes included in the pre-vapor formulation with regard to one or more fluids
  • the solution compound may adjust the osmolarity of the pre-vapor formulation to be between about 200 milliosmoles/L to about 500 milliosmoles/L. In some example embodiments, the solution compound may adjust the osmolarity of the pre-vapor formulation to be between about 280 milliosmoles/L to about 300 milliosmoles/L. In some example embodiments, the solution compound may adjust the osmolarity of the pre-vapor formulation to be between about 290 milliosmoles/L to about 310 milliosmoles/L.
  • the solution compound may adjust the osmolality of the pre-vapor formulation to be between about 200 milliosmoles/kg to about 500 milliosmoles/kg. In some example embodiments, the solution compound may adjust the osmolality of the pre-vapor formulation to be between about 280 milliosmoles/kg to about 300 milliosmoles/kg. In some example embodiments, the solution compound may adjust the osmolality of the pre-vapor formulation to be between about 290 milliosmoles/kg to about 310 milliosmoles/kg.
  • the one or more fluids may, in some example embodiments, include a fluid having an osmolarity between about 200 milliosmoles/L to about 500 milliosmoles/L and/or an osmolality between about 200 milliosmoles/kg to about 500 milliosmoles/kg, such that the pre-vapor formulation may include one or more solution compounds that adjust tonicity of the pre-vapor formulation with regard to the one or more fluids.
  • the one or more fluids may, in some example embodiments, include a fluid having an osmolarity between about 280 milliosmoles/L to about 300 milliosmoles/L and/or an osmolality between about 280 milliosmoles/kg to about 300 milliosmoles/kg, such that the pre-vapor formulation may include one or more solution compounds that adjust tonicity of the pre-vapor formulation with regard to the one or more fluids.
  • the one or more fluids may, in some example embodiments, include a fluid having an osmolarity between about 290 milliosmoles/L to about 310 milliosmoles/L and/or an osmolality between about 290 milliosmoles/kg to about 310 milliosmoles/kg, such that the pre-vapor formulation may include one or more solution compounds that adjust tonicity of the pre-vapor formulation with regard to the one or more fluids.
  • the solution compound included in the pre-vapor formulation which may be soluble in glycerin, propylene glycol and/or or water and may be added in amounts that are effective to increase the stability of the various elements included in the pre-vapor formulation.
  • the oxidation of elements of the pre-vapor formulation may result from the generation of hydroxyl radicals generated from oxygen or hydrogen peroxide (H 2 O 2 ) formed from oxygen in the presence of redox-active transition metals
  • the addition of a solution compound that is configured to scavenge or neutralize of hydroxyl radicals in the pre-vapor formulation may reduce such oxidation of one or more elements of the pre-vapor formulation due to the presence of the hydroxyl radicals is reduced or substantially prevented and the stability of the ingredients present in the pre-vapor formulation is increased.
  • the pre-vapor formulation may include one or more chelating agents, one or more ion exchange agents, some combination thereof, or the like, in addition to one or more solution compounds.
  • the presence of the chelating agents and ion exchange agents may bind all of the redox active free transition metals and the oxygen, thus limiting free radical formation including hydroxyl radicals.
  • one or more solution compounds present in the pre-vapor formulation may react with most or a majority of any remaining free radicals such as hydroxyl radicals.
  • ion exchange agents may include soluble polyelectrolyte polymers with a functional group, such as carboxylic acid groups, sulfonic acid groups such as sulphonated polystyrene, quaternary amino groups such as trimethyl ammonium, and other amino groups.
  • a functional group such as carboxylic acid groups, sulfonic acid groups such as sulphonated polystyrene, quaternary amino groups such as trimethyl ammonium, and other amino groups.
  • acids may protonate molecular nicotine in the pre-vapor formulation, so that upon heating of the pre-vapor formulation by a heater in the cartridge of the e-vaping device, a vapor having a majority amount of protonated nicotine and a minority amount of unprotonated nicotine may be produced, whereby only a minor portion of all the volatilized (vaporized) nicotine may remain in the gas phase of the vapor.
  • the pre-vapor formulation may include up to 5% of nicotine, the proportion of nicotine in the gas phase of the vapor may be substantially 1% or less of the total nicotine delivered.
  • a solution compound is soluble in the pre-vapor formulation.
  • one or more solution compounds may be soluble in a solvent that includes at least one of water, propylene glycol, and glycerin.
  • one or more acids present in a pre-vapor formulation may be configured to transfer into a vapor generated based on heating of the pre-vapor formulation.
  • Transfer efficiency of an acid is the ratio of the mass fraction of the acid in the vapor to the mass fraction of the acid in the pre-vapor formulation.
  • an acid or combination of acids present in the pre-vapor formulation may have a liquid to vapor transfer efficiency of about 50% or greater, and for example about 60% or greater.
  • the pre-vapor formulation may include one or more of pyruvic acid, tartaric acid and acetic acid that have vapor transfer efficiencies of about 50% or greater, respectively.
  • one or more acid(s) present in the pre-vapor formulation are in an amount sufficient to reduce the amount of nicotine gas phase portion by about 30% by weight or greater, by about 60% to about 70% by weight, by about 70% by weight or greater, or by about 85% by weight or greater, of the level of nicotine gas phase portion produced by an equivalent pre-vapor formulation that does not include the acid(s).
  • one or more acid(s) present in the pre-vapor formulation may include one or more of pyruvic acid, formic acid, oxalic acid, glycolic acid, acetic acid, isovaleric acid, valeric acid, propionic acid, octanoic acid, lactic acid, sorbic acid, malic acid, tartaric acid, succinic acid, citric acid, benzoic acid, oleic acid, aconitic acid, butyric acid, cinnamic acid, decanoic acid, 3,7-dimethyl-6-octenoic acid, 1-glutamic acid, heptanoic acid, hexanoic acid, 3-hexenoic acid, trans-2-hexenoic acid, isobutyric acid, lauric acid, 2-methylbutyric acid, 2-methylvaleric acid, myristic acid, nonanoic acid, palmitic acid, 4-pentenoic acid, phenylacetic acid, 3-phen
  • a solvent of the pre-vapor formulation may also include a vapor former.
  • the vapor former may be glycerin.
  • the vapor former is included in an amount ranging from about 40% by weight based on the weight of the pre-vapor formulation to about 90% by weight based on the weight of the pre-vapor formulation (e.g., about 50% to about 80%, about 55% to about 75% or about 60% to about 70%).
  • the pre-vapor formulation can include propylene glycol and glycerin included in a ratio of about 3:2. In some example embodiments, the ratio of propylene glycol and glycerin may be substantially 2:3 and 3:7.
  • the pre-vapor formulation may include water.
  • Water can be included in an amount ranging from about 5% by weight based on the weight of the pre-vapor formulation to about 40% by weight based on the weight of the pre-vapor formulation, or in an amount ranging from about 10% by weight based on the weight of the pre-vapor formulation to about 15% by weight based on the weight of the pre-vapor formulation.
  • One or more acid(s) present in the pre-vapor formulation may have a boiling point of at least about 100° C.
  • the acid(s) may have a boiling point ranging from about 100° C. to about 300° C., or about 150° C. to about 250° C. (e.g., about 160° C. to about 240° C., about 170° C. to about 230° C., about 180° C. to about 220° C. or about 190° C. to about 210° C.).
  • the acids may volatilize when heated by the heater element of the e-vaping device.
  • the heater coil may reach an operating temperature at or about 300° C.
  • the total content of acid(s) present in the pre-vapor formulation may range from about 0.1% by weight to about 6% by weight, or from about 0.1% by weight to about 2% by weight, based on the weight of the pre-vapor formulation.
  • the pre-vapor formulation may also contain between up to 3% and 5% nicotine by weight. In some example embodiments, the total generated acid content of the pre-vapor formulation is less than about 3% by weight. In some example embodiments, the total generated acid content of the pre-vapor formulation is less than about 0.5% by weight.
  • the pre-vapor formulation may also contain between about 4.5% and 5% nicotine by weight. When tartaric acid, pyruvic acid, and/or acetic acid is present, the total acid content of the pre-vapor formulation may be about 0.05% by weight to about 2% by weight, or about 0.1% by weight to about 1% by weight.
  • the pre-vapor formulation may include a flavorant in an amount ranging from about 0.01% to about 15% by weight based on the weight of the pre-vapor formulation (e.g., about 1% to about 12%, about 2% to about 10%, or about 5% to about 8%).
  • the flavorant can be a natural flavorant or an artificial flavorant.
  • the flavorant is one of tobacco flavor, menthol, wintergreen, peppermint, herb flavors, fruit flavors, nut flavors, liquor flavors, and combinations thereof.
  • the nicotine is included in the pre-vapor formulation in an amount (“nicotine content”) ranging from about 2% by weight to about 6% by weight (e.g., about 2% to about 3%, about 2% to about 4%, about 2% to about 5%) based on the weight of the pre-vapor formulation.
  • the nicotine is added in an amount of up to about 5% by weight based on the weight of the pre-vapor formulation.
  • a nicotine content of the pre-vapor formulation is about 2% by weight or greater based on the weight of the pre-vapor formulation.
  • a nicotine content of the pre-vapor formulation is about 2.5% by weight or greater based on the weight of the pre-vapor formulation.
  • a nicotine content of the pre-vapor formulation is about 3% by weight or greater based on the weight of the pre-vapor formulation. In some example embodiments, the nicotine content of the pre-vapor formulation is about 4% by weight or greater based on the weight of the pre-vapor formulation. In some example embodiments, the nicotine content of the pre-vapor formulation is about 4.5% by weight or greater based on the weight of the pre-vapor formulation.
  • a concentration of the nicotine in the vapor phase of the pre-vapor formulation is equal to or less than substantially 1% by weight based on the weight of the pre-vapor formulation.
  • the acid(s) include at least one of pyruvic acid, formic acid, oxalic acid, glycolic acid, acetic acid, isovaleric acid, valeric acid, propionic acid, octanoic acid, lactic acid, sorbic acid, malic acid, tartaric acid, succinic acid, citric acid, benzoic acid, oleic acid, aconitic acid, butyric acid, cinnamic acid, decanoic acid, 3,7-dimethyl-6-octenoic acid, 1-glutamic acid, heptanoic acid, hexanoic acid, 3-hexenoic acid, trans-2-hexenoic acid, isobutyric acid, lauric acid, 2-methylbutyric acid, 2-methylvale

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
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US15/423,699 US20180220697A1 (en) 2017-02-03 2017-02-03 Methods and systems for improving stability of pre-vapor formulations of e-vaping devices
KR1020197019108A KR102649834B1 (ko) 2017-02-03 2018-02-02 E-베이핑 장치의 기화전 제제의 안정성을 개선하기 위한 방법 및 시스템
RU2019127181A RU2751668C2 (ru) 2017-02-03 2018-02-02 Способы и системы для улучшения стабильности предиспарительных составов е-вейпинговых устройств
CN201880006151.4A CN110167365B (zh) 2017-02-03 2018-02-02 用于提高电子蒸气烟装置的蒸气前调配物的稳定性的方法和系统
JP2019531215A JP7208899B2 (ja) 2017-02-03 2018-02-02 ｅベイピング装置のプレベイパー製剤の安定性を改善するための方法およびシステム
PCT/EP2018/052717 WO2018141941A2 (en) 2017-02-03 2018-02-02 Methods and systems for improving stability of pre-vapor formulations of e-vaping devices
MX2019008845A MX2019008845A (es) 2017-02-03 2018-02-02 Metodos y sistemas para mejorar la estabilidad de la formulacion prevapor de un dispositivo de vapeo electronico.
CA3041189A CA3041189A1 (en) 2017-02-03 2018-02-02 Methods and systems for improving stability of pre-vapor formulations of e-vaping devices
EP18703309.7A EP3576552A2 (en) 2017-02-03 2018-02-02 Methods and systems for improving stability of pre-vapor formulations of e-vaping devices
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