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WO2025140943A1 - Produit de pulvérisation - Google Patents

Produit de pulvérisation Download PDF

Info

Publication number
WO2025140943A1
WO2025140943A1 PCT/EP2024/087592 EP2024087592W WO2025140943A1 WO 2025140943 A1 WO2025140943 A1 WO 2025140943A1 EP 2024087592 W EP2024087592 W EP 2024087592W WO 2025140943 A1 WO2025140943 A1 WO 2025140943A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
stem
valve stem
spray product
propellant
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.)
Pending
Application number
PCT/EP2024/087592
Other languages
English (en)
Inventor
Merion Evans
Louise Ombler McMaster
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Unilever Global IP Ltd
Unilever IP Holdings BV
Conopco Inc
Original Assignee
Unilever Global IP Ltd
Unilever IP Holdings BV
Conopco Inc
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 Unilever Global IP Ltd, Unilever IP Holdings BV, Conopco Inc filed Critical Unilever Global IP Ltd
Publication of WO2025140943A1 publication Critical patent/WO2025140943A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/14—Containers for dispensing liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant
    • B65D83/44—Valves specially adapted for the discharge of contents; Regulating devices
    • B65D83/48—Lift valves, e.g. operated by push action
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/14—Containers for dispensing liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant
    • B65D83/58—Containers for dispensing liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant with separate inlets for contents and propellant feeding into a duct upstream of the dispensing valve

Definitions

  • compositions of the invention are preferably cosmetic compositions, i.e. non-therapeutic.
  • all percentages, parts, and ratios are by weight, unless otherwise indicated.
  • the liquid base composition is preferably a suspension of particulate solid in a liquid.
  • Such compositions are particularly difficult to spray using a propellant system according to the present invention, due to potential blockage issues. This problem is addressed admirably by use of the features of the present invention, in particular the preferred and more preferred features.
  • the liquid base composition is a cosmetic composition, suitable for topical application to the surface of the human body.
  • carrier oil is an organic material that is a liquid at ambient conditions and is non- miscible with water.
  • the carrier oil may be composed of a mixture of component oils.
  • the carrier oil may be selected from any of those known in the art, although hydrophobic carrier oils are preferred. Suitable carrier oils include silicone oils and nonsilicone oils, although it is preferred that the liquid base composition is free of silicone oil in some embodiments.
  • mean (D50) particle sizes may be measured using (laser) light scattering techniques, for example using a Mastersizer instrument, obtainable from Malvern Instruments. Such instruments are set to produce a volume plot and a lens is selected in accordance with the maker's instructions to accommodate the expected particle size distribution, (or various lenses can be tested until the best lens is identified). Measurements are made by methods known in the art.
  • Preferred cosmetic actives when employed, are antiperspirant actives and preferred antiperspirant actives are astringent aluminium salts, such as aluminium chlorohydrate (ACH) or aluminium sesquichlorohydrate (ASCH).
  • ACH aluminium chlorohydrate
  • ASCH aluminium sesquichlorohydrate
  • the propellant comprises a liquified gas propellant and a compressed gas.
  • the compressed gas and a portion of the liquified gas propellant sit in a headspace above the liquid base composition.
  • a further portion of the liquified gas propellant is typically dissolved in the liquid base propellant.
  • the weight ratio of compressed gas to liquefied gas is preferably from 0.1 : 99.9 to 10: 90, more preferably from 0.5: 99.5 to 8: 92, still more preferably from 1: 99 to 6: 94 and most preferably from 1: 99 to 4: 96; this aiding spray quality and the longevity of spray quality.
  • the pressure exerted by the total propellant within products according to the invention is preferably from 85 to 125 psig (0.59 to 0.86 MPa) at 25°C, these pressures assisting with good spray quality and delivery.
  • Preferred compressed gases are inert, i.e. unreactive materials.
  • a particularly preferred inert compressed gas is nitrogen.
  • Other suitable inert gases are carbon dioxide, helium and argon; although these gases are less preferred for practical reasons, in particular their greater expense.
  • Preferred liquified gas propellants are blends of propane, butane and/or isobutane, with the less preferred addition of an HFC.
  • preferred HFCs have from 2 to 4 carbon atoms.
  • a commercially acceptable HFC is HFC-152a, otherwise known as R152a and having the chemical name 1,1- difluroethane (DFE).
  • DFE 1,1- difluroethane
  • compositions according to the invention are free of HFC in order to minimise greenhouse gas content.
  • HFC-152a otherwise known as R152a and having the chemical name 1,1- difluroethane (DFE).
  • DFE 1,1- difluroethane
  • HFCs hydrofluoroolefins
  • HFOs hydrofluoroolefins
  • 1, 3,3,3- tetrafluoropropene otherwise known as HFO-1234ze.
  • the base to propellant ratio is preferably from 30: 70 to 80: 20, more preferably from 40: 60 to 80: 20, and most preferably from 50: 50 to 80: 20.
  • Reasons for these preferences relate to spray quality.
  • the reservoir for the liquid base composition and propellant is simply the internal volume of a typical aerosol can, minus the space taken by the other components of the dispenser described herein.
  • the valve comprises a valve housing comprising a vapour phase tap (VPT) and a restricted tail piece (RTP), the valve housing containing a valve stem and a valve spring located around a narrowed lower section of the valve stem.
  • VPT vapour phase tap
  • RTP restricted tail piece
  • the VPT is an orifice in the valve housing, which allows vapour to enter the valve housing when the valve is opened (vide infra).
  • the vapour entering through the VPT comes from a headspace above the liquid base composition in the reservoir.
  • the RTP is an orifice in the valve housing, typically at its bottom end leading and towards a tail piece beyond.
  • the RTP allows liquid base composition to enter the valve housing when the valve is opened.
  • valve stem is a key component of most commercial valves. Depression of the valve stem by an associated actuator button opens the valve by unblocking the stem orifice, which is a conduit between a central channel within the valve stem and the inner volume of the valve housing, known as the valve chamber. Typically, the stem orifice is blocked by a stem gasket which surrounds an upper part of the valve stem when the valve is in its closed position. The stem gasket also serves to seal off the valve chamber at its upper end.
  • the valve chamber is the volume within the valve housing which is exterior to valve stem.
  • the rotational alignment of the VPT and the stem orifice is important to the quality of spray generation. It is preferred that the VPT and stem orifice are radially out of alignment, preferably to an extent of from 30 to 180°, more preferably to an extent of from 60 to 180°, and most preferably to an extent of from 90 to 180°. Without wishing to be bound by theory, it is understood that adding radial movement as well as vertical movement to the vapour entering from the VPT before its exit through the stem office enhances mixing with the liquid base composition and, hence, spray quality.
  • the valve stem comprises a narrowed section at its lower end. This narrowed section is surrounded by the valve spring which serves to return the valve stem to its original position when downward pressure upon it is removed.
  • the valve spring is a conventional coil spring.
  • the narrowed section of the valve stem is preferably tapered, reducing in diameter in a downward direction; this can aid the fitting of the valve spring thereon.
  • the valve spring is held away from the bottom of valve housing by one or more shelves protruding inwards from the lower inner surface of the valve housing. This serves to create a space into which the valve spring cannot descend, which can aid mixing of the propellant and the liquid base composition during actuation.
  • valve spring is never fully compressed, even when the valve stem has been depressed to its maximum extent. By leaving spaces between the coils of the spring, it is believed that mixing of the propellant and the liquid base composition may be enhanced (during actuation of the valve).
  • the outer diameter of the narrowest part of the section is preferably from 50 to 80% that of the widest part of the valve stem outer diameter, ignoring amy splines thereon (vide infra). This creates space for optimal mixing of the liquid base composition and the propellant and subsequent good quality spray generation.
  • the means to transfer the liquid base composition to the valve housing via the RTP preferably comprises a dip tube. This is attached to the tail piece of the valve housing and serves to transfer the liquid base composition from the bottom of the reservoir to the valve chamber via the RTP. This is a common feature of many aerosol dispensers.
  • the diameters of the VPT, RTP and stem channel are the minimum cross-sectional distances across these channels.
  • Each of these channels is preferably cylindrical and may be of uniform diameter or tapered (tapered being the preferred option for the VTP and the stem orifice).
  • the VPT is preferably of diameter from 0.2 to 0.9 mm, more preferably from 0.2 to 0.6 mm and most preferably from 0.3 to 0.5 mm.
  • the RTP is preferably of diameter from 0.2 to 1.2 mm, more preferably from 0.4 to 0.7 mm and most preferably from 0.45 to 0.65 mm.
  • the ratio of the diameters of the VTP and RTP is preferably from 1 : 2 to 1 : 1 , more preferably from 1: 1.5 to 1: 1, and most preferably from 1 : 1.6 to 1: 1: 1.2.
  • the ratio of the areas of the VTP and RTP is most preferably from 1: 1.63 to 1: 1.244.
  • the stem orifice is preferably of diameter from 0.2 to 0.6 mm and more preferably from 0.3 to 0.5 mm.
  • valve housing containing the valve stem and the valve spring, and a stem gasket are crimped onto a valve cup, which is in turn crimped onto an opening in the reservoir, together with a cup gasket, the stem gasket and the cup gasket providing a gas-tight seal between the associated components.
  • the valve stem comprises one of more vertical splines protruding radially from its outer surface at a position above the narrowed lower section of said valve stem. These serve to enhance the mixing of the vapour entering the valve chamber via the VPT and the liquid base composition entering via the RTP, thereby enhancing spray quality.
  • the vertical splines increase the proportion of vertical movement of the mixture produced from the vapour from the VTP and the liquid base composition entering via the RTP and that this enhances breakup of the liquid base composition and hence spray quality.
  • the radial alignment of the vertical splines relative to the VPT may lead to improved spray quality. It is preferred that the VPT is radially aligned to penetrate the valve housing between the vertical splines protruding from the outer surface of the valve stem above its narrowed lower section. Enhanced mixing of the propellant and liquid base composition is believed to result.
  • vertical splines extend radially inwards from the inner surface of the valve housing. This has all the benefits referred to for the splines protruding radially outwards from the outer surface of the valve stem referred to above. In addition, it is easier to achieve radial alignment of the VPT between the splines, which is a particularly preferred feature in this alternative embodiment.
  • the vertical splines referred to in the paragraph immediately above protrude at least 50% of the remaining radial distance towards inner surface of the valve housing.
  • the spray produced by the dispenser is a fine spray having a Sauter mean droplet size (D[3,2]) of less than 100 microns, preferably from 10 to 100 microns, more preferably from 10 to 70 microns, and most preferably from 10 to 60 microns.
  • D[3,2] Sauter mean droplet size
  • Figure 1 is a vertical cross-section of a valve (2), valve cup (3) and other components (described further herein).
  • the valve (2) is in its closed position.
  • Figure 2 is a is a cross-section as in Figure 1 , but with the valve in its open position.
  • Figure 3 is an angled view of a valve housing (4) from the top.
  • Figure 4 is a perspective view of a valve stem (5).
  • Figure 5 is a horizontal cross-section through the valve at level of the VTP (17).
  • Figure 1 shows the valve (2) held within a valve cup (3) with the valve (2) in its closed position. In this closed position, a stem orifice (6) is blocked by a valve gasket (7).
  • the valve gasket (7) also serves to seal off a valve chamber (8) present within a valve housing (4) and yet exterior to a valve stem (5).
  • the stem orifice (6) serves as a conduit between a valve stem central channel (5CC) and the valve chamber (8).
  • the valve stem central channel (5CC) allows the mixture entering it to pass upwards to an exit orifice (not illustrated) through which the aerosol spray is emitted.
  • RTP restricted tail piece
  • the RTP (13) is a conduit between the valve chamber (8) and a downwardly projecting tail piece (14) that bears a dip tube (15).
  • the dip tube (15) extends from the tail piece (14) to the bottom of the reservoir (not illustrated).
  • a circumferential barb (16) helps retain the dip tube (15) on the tail piece (14).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Cosmetics (AREA)

Abstract

La présente invention concerne un produit de pulvérisation comprenant une composition de base liquide ; un propulseur ; et un distributeur pour mélanger les composants en aérosol en sortie dudit distributeur ; le propulseur comprenant un gaz propulseur liquéfié et un gaz comprimé ; et le distributeur comprenant une vanne dotée d'un VPT dans le logement ; une section inférieure rétrécie de la tige de vanne étant au-dessous du VPT dans le logement de vanne lorsque la tige de vanne est complètement enfoncée.
PCT/EP2024/087592 2023-12-27 2024-12-19 Produit de pulvérisation Pending WO2025140943A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP23220319.0 2023-12-27
EP23220319 2023-12-27

Publications (1)

Publication Number Publication Date
WO2025140943A1 true WO2025140943A1 (fr) 2025-07-03

Family

ID=89386221

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2024/087592 Pending WO2025140943A1 (fr) 2023-12-27 2024-12-19 Produit de pulvérisation

Country Status (1)

Country Link
WO (1) WO2025140943A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0753561A1 (fr) 1995-07-13 1997-01-15 The Procter & Gamble Company Composition moussante emballée
US20050098588A1 (en) * 2001-12-14 2005-05-12 Steag Microparts Gmbh Apparatus for dispensing an atomized liquid product
JP4155783B2 (ja) * 2002-09-20 2008-09-24 株式会社ダイゾー 粉末含有エアゾール製品用バルブおよび該バルブを用いた粉末含有エアゾール製品
US8191739B1 (en) 2008-05-30 2012-06-05 Amrep, Inc. Mixed gas method for filling aerosol containers and aerosol formulas for improved environmental profile by VOC/HFC reduction
WO2014156854A1 (fr) * 2013-03-25 2014-10-02 株式会社マンダム Produit d'aérosol et utilisation de produit d'aérosol
WO2022012947A1 (fr) 2020-07-17 2022-01-20 Unilever Ip Holdings B.V. Produit aérosol
WO2022013362A1 (fr) 2020-07-17 2022-01-20 Unilever Ip Holdings B.V. Produit de soins capillaires en aérosol
WO2022229418A1 (fr) * 2021-04-29 2022-11-03 Lindal France, Sas Procédé pour fabriquer une soupape de valve de prélèvement avec une sécurité contre les surpressions, et soupape de valve
US20230278505A1 (en) 2020-09-14 2023-09-07 Sika Technology Ag Insulating element

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0753561A1 (fr) 1995-07-13 1997-01-15 The Procter & Gamble Company Composition moussante emballée
US20050098588A1 (en) * 2001-12-14 2005-05-12 Steag Microparts Gmbh Apparatus for dispensing an atomized liquid product
JP4155783B2 (ja) * 2002-09-20 2008-09-24 株式会社ダイゾー 粉末含有エアゾール製品用バルブおよび該バルブを用いた粉末含有エアゾール製品
US8191739B1 (en) 2008-05-30 2012-06-05 Amrep, Inc. Mixed gas method for filling aerosol containers and aerosol formulas for improved environmental profile by VOC/HFC reduction
WO2014156854A1 (fr) * 2013-03-25 2014-10-02 株式会社マンダム Produit d'aérosol et utilisation de produit d'aérosol
WO2022012947A1 (fr) 2020-07-17 2022-01-20 Unilever Ip Holdings B.V. Produit aérosol
WO2022013362A1 (fr) 2020-07-17 2022-01-20 Unilever Ip Holdings B.V. Produit de soins capillaires en aérosol
US20230270656A1 (en) * 2020-07-17 2023-08-31 Conopco, Inc., D/B/A Unilever Aerosol hair care product
US20230278505A1 (en) 2020-09-14 2023-09-07 Sika Technology Ag Insulating element
WO2022229418A1 (fr) * 2021-04-29 2022-11-03 Lindal France, Sas Procédé pour fabriquer une soupape de valve de prélèvement avec une sécurité contre les surpressions, et soupape de valve

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