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 or packages with special means for dispensing contents for delivery of liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant for a product delivered by a propellant
  • B65D83/44—Valves specially adapted therefor; Regulating devices
  • B65D83/48—Lift valves, e.g. operated by push action

Definitions

• the present invention relates to a dispenser for a liquid product containing a film-forming polymer. More particularly, this dispenser is an aerosol dispenser comprising in a container, a pressurized propellant, a dispensing nozzle and a dispensing valve for controlling, at will, the dispensing of the product, and making it possible to deliver this product in the form of fine droplets. or fog.
• the product to be sprayed is an aqueous or hydroalcoholic composition containing at least one film-forming polymer. More particularly, this composition is a hair composition such as a hairspray for fixing the hair, a lotion for brushing, a styling lotion or a styling composition.
• the hair compositions to be sprayed on the hair essentially consist of an alcoholic or hydroalcoholic solution and a solubilized polymer, optionally mixed with various cosmetic adjuvants.
• this solution is packaged either in a pump bottle or in a suitable pressurized container.
• Document EP-A-0 008 109 discloses a pressure distributor for dispensing a liquid product or a dispersion of particles.
• This dispenser is provided with a valve comprising a main body and a premix chamber provided with an additional gas outlet.
• the product is brought into this chamber by a capillary dip tube.
• the chamber is in communication with the valve body.
• the valve body can be placed in communication with a spray nozzle by actuation of an operating rod which comprises, for this purpose a passage orifice, closed in the rest position.
• the flow rate of the valve is determined by the section of the capillary tube. According to this document, by using a valve with a premix chamber, the flammability of the product to be sprayed is reduced.
• a dispenser with a sequential valve comprising an additional gas intake and provided with a mixing prechamber.
• This valve is configured so as to allow the purging of the distribution conduits downstream of the valve by a jet of pure propellant gas.
• the valve is provided with a prechamber into which an additional gas intake ends.
• propellant gas enters the prechamber, which has the consequence that the internal pressure in the prechamber drops, so that any aspiration of the product by a suction passage is prevented.
• valve stem When the valve stem is fully inserted, said passage is closed off by a projection of the stem, so that a gas / product mixture can be dispensed.
• the volume of the prechamber is occupied substantially entirely by the lower portion of the rod, so that, in the dispensing position, this prechamber is substantially nonexistent. In other words, in the dispensing position, this valve has substantially no prechamber.
• document BE-A-664,905 describes a valve of the same kind. At the bottom of the valve body is provided a product inlet orifice, ending in a premix chamber provided with an additional gas intake. Bedroom premix is separated from the main valve chamber by an elastomeric wall which is traversed by a through hole. Upon actuation of this valve, the elastomeric wall is pushed towards the bottom of the valve body, so that the premix chamber becomes substantially nonexistent.
• the problems posed by such a device are identical to those described with reference to document US-A-3,653,553.
• the correct spraying being an essential element for the final quality of the application of a hair composition to be sprayed onto the hair, it is essential to remedy these drawbacks to obtain good quality in fine particles and a good distribution of the spray over the of the whole hair.
• the Applicant has now discovered that by reducing the delivery rate compared to a rate usually used, and by combining a cosmetic composition containing, in an appropriate aqueous medium, at least one insoluble polymer, with a dispenser equipped with a particular valve, it was possible to reduce or even eliminate clogging of the spray nozzle.
• This valve is of the type which includes a product / gas premix chamber into which an additional gas outlet opens. A passage of determined section connecting the interior of the valve body to the premix chamber, so that the flow rate of the valve is determined by the section of said passage.
• the Applicant has found, surprisingly, that by using this particular valve, the formation of foam around the spray nozzle was suppressed, or in any case, localized in places which do not appreciably affect the correct operation of the device.
• the present invention therefore relates to a dispenser as defined in claim 1, which makes it possible to obtain a better quality of spraying (size of the droplets).
• the invention makes it possible to obtain good spraying; the spray is regular and the sprayed drops are fine.
• the product is easily distributed over the entire hair. Finally, the drying time of this spray on the hair is low.
• a conventional aerosol container forming a reservoir for them.
• this tank is surmounted by a double-chamber valve, fixed to the tank, for example using a metal cup.
• This container is advantageously equipped with means for controlling the valve, for example a hollow actuating rod connecting the valve to a dispensing head or push button provided with a dispensing orifice, for example a spray nozzle.
• This nozzle can be a conventional vortex or semi-vortex nozzle, such as, for example that described in document DE-A-1 209 517, that is to say a nozzle capable of imparting to the mixture of product and gas , before coming out of the nozzle, a swirling movement.
• the valve which can be used according to the invention is a valve with an actuating rod, called a male valve, emerging from the valve body, capable of being urged against an elastic return element such as a spring. , housed in the valve body. It is also possible to use a female valve associated with a dispensing head equipped with a rod, or even a valve with lateral deformation. This valve advantageously includes an additional gas intake.
• valve stem has a distribution channel, closed in the valve rest position and open during product distribution.
• valve comprising first and second chambers, which can be used in the invention, mention may be made, for example, of a valve of the type described in documents US-A-3 159 318 or EP-A-0 445 358, provided to have adjusted the section of the different passages, as described above.
• the diameter of the distribution channel of the control means is greater than the diameter of the passage between the chambers, and has, for example, a diameter of approximately 0.4 mm to approximately 1.0 mm.
• the first and second chambers of the valve are aligned along a longitudinal axis of the dispenser. According to a first embodiment, they are separated by a fixed transverse partition, in which the passage is practiced. According to a second preferred embodiment, the partition is movable, integral with the control means. In this case, the passage forms an angled channel, connecting the first and second chambers, the partition being in the form of a piston, sliding, in leaktight manner, in the valve body.
• this passage has a diameter chosen so that the product flow rate, during its distribution ranges from 200 mg / s to 600 mg / s.
• this passage may have a diameter ranging from 0.2 mm to 0.5 mm, chosen as a function of the desired product flow rate and the viscosity of the product.
• the product does not encounter any restriction of a diameter smaller than the diameter of the passage, so that the flow rate of the valve is determined by the section of said passage.
• the additional gas intake orifice has a diameter at most equal to the diameter of the product inlet orifice, called the second orifice.
• the second orifice constitutes an internal restriction made in a product suction conduit allowing the product to be conveyed from the container to the first chamber of the valve.
• This conduit is, for example a dip tube, one free end of which is permanently immersed in the product.
• the first orifice may have a diameter ranging from 0.2 mm to 0.6 mm and the second orifice a diameter ranging from 0.2 mm to 0.6 mm, also.
• the first orifice has a diameter at most equal to the diameter of the second orifice.
• the product contained in the dispenser is a hair product such as a hairspray for fixing the hair, a lotion for brushing, a styling lotion or a styling composition.
• the product comprises an essentially aqueous or slightly hydroalcoholic medium.
• the continuous aqueous or hydroalcoholic medium serving as a support for the product used according to the invention is preferably constituted by water or a mixture of water and cosmetically acceptable solvents such as mono-alcohols, polyalcohols and ethers of glycol, which can be used at low concentration alone or as a mixture. Even more preferably. said support consists essentially of water.
• the polymer can be present in this medium in dissolved form.
• the polymer is dispersed in the product. It is possible, if necessary, to combine one or more soluble polymers with one or more polymers dispersed in the medium.
• the polymer is a dispersed polymer
• its particle size is preferably less than 1 ⁇ m.
• this or these polymers can be cationic, anionic, amphoteric or nonionic in nature.
• aqueous dispersions of insoluble polymer particles which can be used according to the invention are generally obtained by suspension or emulsion polymerization or copolymerization according to methods well known from the state of the art. Such dispersions are also known as "latex".
• this polymer when this polymer is in the form of a "latex", it results from the polymerization or copolymerization of monomers chosen from styrene, butadiene, ethylene, propylene, vinyl toluene, vinyl propionate, l vinyl alcohol, acrylonitrile, chloroprene, vinyl acetate, urethanes, isoprene, isobutene and esters or amides of acrylic or methacrylic, maleic, crotonic or itaconic acids, vinyl ether, vinylpyrrolidone, vinylimidazole, their esters and their amides.
• monomers chosen from styrene, butadiene, ethylene, propylene, vinyl toluene, vinyl propionate, l vinyl alcohol, acrylonitrile, chloroprene, vinyl acetate, urethanes, isoprene, isobutene and esters or amides of acrylic or methacrylic, maleic
• Such dispersed polymers are, for example, described in patent application EP-A-0 590 604.
• An aqueous polymer dispersion which can be used in accordance with the invention comprises, for example, 25% by weight of an ethyl acrylate / methyl methacrylate / methacrylic acid / acrylic acid copolymer having a glass transition temperature of approximately 30 ° C, sold in particular under the trade name AMERHOLD DR-25 by the company AMERCHOL.
• Aqueous dispersions which are also suitable for the invention are also aqueous dispersions of styrene / butyl acrylate copolymers such as for example the product sold under the trade name URAMUL SC 70 by the company D.S.M. Resins.
• the polymers (soluble and / or dispersed) are present in a proportion at least equal to 15% of the total weight of the product.
• the proportion of the polymer is chosen from 15% to 50% of the total weight of the product, and preferably from 15% to 35% of the total weight of the product (excluding propellant).
• a copolymer comprising from 50 to 60% by weight of ethyl acrylate, from 30 to 40% by weight of methyl methacrylate, from 2 to 10% by weight of acrylic acid, from 2 to 10% by weight of methacrylic acid, the total concentration of acrylic and methacrylic acid not exceeding 15% by weight relative to the total weight of the acrylic copolymer.
• the pH of the products targeted by the invention is generally between 2 and 9, and in particular between 3 and 8. It can be adjusted to the desired value by means of basifying or acidifying agents usually used in cosmetics for this type of application.
• the products in accordance with the invention may also contain preservatives, sequestering agents, perfumes, silicones, dyes, viscosity modifying agents, anti-foaming agents, anti-dandruff agents, antiseborrhoeic agents, sun filters, proteins, vitamins, plasticizers, perfumes or conditioners.
• preservatives sequestering agents, perfumes, silicones, dyes, viscosity modifying agents, anti-foaming agents, anti-dandruff agents, antiseborrhoeic agents, sun filters, proteins, vitamins, plasticizers, perfumes or conditioners.
• the latter can then be chosen from oils and natural or synthetic waxes, fatty alcohols, esters of polyhydric alcohols, glycerides, polymers or mixtures of these different compounds.
• the product according to the invention is pressurized in the form of an aerosol in a suitable dispenser, comprising the product described above, and at least one propellant gas which can be chosen from volatile hydrocarbons such as n-butane, propane, isobutane, pentane, chlorinated and / or fluorinated hydrocarbons, dimethyl ether and their mixtures.
• a suitable dispenser comprising the product described above, and at least one propellant gas which can be chosen from volatile hydrocarbons such as n-butane, propane, isobutane, pentane, chlorinated and / or fluorinated hydrocarbons, dimethyl ether and their mixtures.
• the concentration of liquefied propellant (s) is generally between 10 and 50% by weight relative to the total weight of the pressurized product and preferably between 15 and 35% by weight.
• Carbon dioxide, nitrous oxide, nitrogen, compressed air and mixtures thereof can also be used as the propellant.
• the concentration of the polymer is preferably at least 7% by weight relative to the weight of the pressurized product (product + propellant), and even more preferably between 10% and 35% by weight.
• the Applicant has found that by using a dispenser and a product as described above and while respecting the dimensions of the valve orifices indicated above, no foaming occurs at the outlet of the nozzle. distribution, unlike the use of a single chamber valve with additional gas intake. In addition, no blockage during distribution was observed. In addition, from the start to the end of the distribution, the quality of the spray is good and uniform (particle size, distribution of the droplets on the affected surface).
• Figure 1 shows an axial section of a dispenser according to a first embodiment of the invention, in the storage position.
• FIG. 2 shows a partial axial section of the dispenser of Figure 1 in the position of use.
• FIG. 3 represents an axial section of a dispenser according to a second embodiment of the invention, in the storage position.
• a dispenser of capillary lacquer P with dispersed film-forming polymer pressurized with a propellant gas G, in order to ensure spraying.
• This dispenser comprises a generally cylindrical container 2 with closed bottom 4, forming a reservoir for the lacquer P.
• FIG. 1 we can see the lacquer P in the lower part of the container, surmounted by a gaseous phase constituted by the propellant G which then found in the upper part of the container.
• the end opposite the bottom 4 of the container 2 is shaped like a dome 6 having a cylindrical neck 8 of smaller diameter than that of the container 2 and ending with a rolled annular edge 10.
• valve 15 is a push-in valve, comprising a hollow actuating rod 16 emerging towards the outside of the container 2.
• a push button 18 provided with a spray nozzle 20.
• This nozzle 20 is, for example a known vortex or semi-vortex nozzle.
• a bent distribution channel 22 connects the nozzle 20 to the rod 16.
• the body 14 of the valve 15 has a central axis A, a substantially cylindrical side wall 24, a circular bottom 26 and on the side opposite the bottom 26 a sealing washer 40 made of elastomeric material, these elements defining a chamber 28.
• the washer 40 is crossed, in leaktight manner, by rod 16.
• the chamber 28 is composed of two parts 28a and 28b:
• the chamber 28a is situated on the side of the bottom 26 and constitutes a premix chamber of propellant gas G / lacquer P.
• a first orifice d 1 for additional gas intake allowing the propellant gas G present in the upper part of the container 2, to access the chamber 28a.
• a second central orifice d 2 in the bottom 26 is pierced a second central orifice d 2 , intended to be placed in communication with the lacquer contained in the container 2.
• the orifice d 2 constitutes a first restriction of access of the lacquer P in the chamber 28a.
• the bottom 26 is extended by an external tube 30, facing the bottom 4, itself connected to a dip tube 32 which extends to the bottom 4 of the container.
• a helical spring 34 In the chamber 28a is disposed a helical spring 34, a first end 35 of which rests on the bottom 26 (see FIG. 2), its opposite end 36 bears against a circular piston 38, mounted axially movable in the chamber 28 constituting a movable partition .
• the piston 38 has an annular peripheral sealing lip separating the two parts 28a and 28b of the chamber 28.
• This piston 38 is connected to the actuating rod 16 with which it is coaxial. The latter crosses the chamber 28b, as well as the washer 40 and the central portion of the cup 12.
• a blind bore 17 passes through the emerging part of the rod 16 to the level of the washer 40.
• a distribution duct g in continuity with the bore 17, passes radially through the wall of the rod 16, opening out at right angles to the thickness of the washer 40.
• the rod 16 also comprises an angled passage p formed by a blind axial bore, on the side of the chamber 28a, which leads, through a radial channel 29 of the passage p , into the chamber 28b.
• the section of the passage p determines the flow rate of the valve, during the distribution of the lacquer P.
• the passage p has a diameter of approximately 0.2 mm to approximately 0.4 mm. This diameter is chosen according to the desired lacquer flow rate, as well as the viscosity of the latter.
• the first chamber 28a constitutes a premix chamber, in which the propellant G mixes with the lacquer P, when the user presses the push button 18 in the direction of arrow F.
• the propellant gas present in the upper part of the container 2 enters the chamber 28a through the orifice d 1 .
• the lacquer P rises, under the action of the propellant gas G in the dip tube 32 and accesses the chamber 28a through the second orifice d 2 .
• the ports d 1 and d 2 are calibrated to obtain an optimal propellant / lacquer ratio.
• the latter swirls in the chamber 28a and is charged with a bubble of propellant gas.
• the gas / product mixture then passes through the passage p which constitutes a second restriction. At the passage p , the gas / product mixture is accelerated.
• the first orifice d 1 has a diameter ranging from 0.2 mm to 0.6 mm.
• the diameter of the second orifice d 2 is from 0.2 mm to 0.6 mm.
• this mixture relaxes, which leads to good homogenization of the mixture.
• This mixture is then conveyed, via the duct g , the hollow rod 16 and the distribution channel 22, to the nozzle 20.
• the mixture bursts in the form of a fine spray cone. droplets.
• FIG. 3 shows, in partial axial section, a variant of distributor 101, comprising a valve 115 different from that of FIG. 1.
• the parts identical to those of FIG. 1 have the same references, added to 100; their description will not be repeated.
• the valve 115 of FIG. 3 comprises a body 124 in two parts, an upper part 124b and a lower part 124a coaxial of the same diameter, defining a chamber 128.
• This chamber 128 is divided into two parts 128a, 128b by a transverse partition 126 belonging to room 124b. Unlike the embodiment of Figure 1, this partition is fixed. It has a central opening p ensuring communication between the two chambers 128a and 128b.
• the actuating rod 116 does not include a piston.
• a part of the rod housed inside the upper chamber 128b has an annular projection 136, bearing against the free end 34a of the return spring 34.
• the part 124a has a bottom 125 pierced with an orifice d 2 constituting a first product access restriction, and putting the part 124a in communication with the lacquer contained in the container 102.
• This distributor 101 is analogous to the operation of the distributor in FIG. 1.
• a hair spray P was prepared having the following composition: AMERHOLD DR 25 (1) in dispersion 10 g MEXOMERE PW (2) in solution 10 g Polyoxypropylene (3) methyl ether 1 g Perfume qs Water qs 100 g (1) : AMERHOLD DR 25 sold by the company AMERCHOL: copolymer of ethyl acrylate / methyl methacrylate / methacrylic acid / acrylic acid in aqueous dispersion. (2) : MEXOMERE PW, anionic polymer marketed by the company CHIMEX composed of vinyl acetate / p-tert-butyl benzoate / crotonic acid terpolymer
• the valve is connected to a semi-vortex nozzle provided by the company VALVE PRECISION under the trade name MACH III.

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• 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)

Applications Claiming Priority (3)

Publications (2)

Family

ID=9492875

Family Applications (1)

Country Status (7)

Families Citing this family (28)

Family Cites Families (9)

• 1996
  • 1996-06-10 FR FR9607158A patent/FR2749568B1/fr not_active Expired - Fee Related
• 1997
  • 1997-06-05 JP JP50128198A patent/JP3724812B2/ja not_active Expired - Fee Related
  • 1997-06-05 US US09/000,494 patent/US6173907B1/en not_active Expired - Fee Related
  • 1997-06-05 WO PCT/FR1997/000997 patent/WO1997047535A1/fr active IP Right Grant
  • 1997-06-05 ES ES97927242T patent/ES2206720T3/es not_active Expired - Lifetime
  • 1997-06-05 DE DE69724815T patent/DE69724815T2/de not_active Expired - Fee Related
  • 1997-06-05 EP EP97927242A patent/EP0942879B1/fr not_active Expired - Lifetime

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