JPWO2021011960A5 - - Google Patents

Description

Accordingly, it would be beneficial to provide a microfluidic cartridge that does not contain substances that can react with fluid compositions containing perfume mixtures.

The present invention is directed to microfluidic cartridges. The microfluidic cartridge is configured to be removably connectable with the housing of the microfluidic delivery device. A microfluidic cartridge can include an interior and an exterior. The interior of the microfluidic cartridge may comprise a reservoir for containing the liquid composition. The reservoir may include a fluidic channel extending from the reservoir and terminating in a fluidic opening that is in fluid communication with a microfluidic die disposed on the exterior of the microfluidic cartridge. The microfluidic cartridge may include electrical circuitry that electrically connects the microfluidic die with a power source and controller. The electrical circuit can be bonded to the exterior of the microfluidic cartridge using a silicone pressure sensitive adhesive. Silicone pressure-sensitive adhesives, unlike other common adhesives, do not contain substances that can chemically react with fluid compositions, including perfume mixtures, while keeping electrical circuits external to the microfluidic cartridge. It has also been found to provide adhesive strength to bond with.

Referring to FIGS. 3, 6 and 7, electrical circuitry 52 may be bonded to exterior 14 of microfluidic cartridge 10 using adhesive 62 . It has been found that certain adhesives may interact with the perfume mixture of the fluid composition dispensed from microfluidic die 51 . In particular, some adhesives absorb perfume mixtures, swell the adhesives, displace electrical circuitry 52 and microfluidic die 51, and cause physical and electrical instability of electrical circuitry 52 and microfluidic die 51. Bring. The silicone pressure sensitive adhesive provides sufficient interfacial adhesive strength to secure the electrical circuit 52 to the microfluidic cartridge 10 while avoiding substances that may chemically react with the perfume mixture in the fluid composition. Turns out it doesn't .

Sticker 32 and/or lid sticker 63 may comprise a carrier material and an adhesive disposed on the side of the carrier material that will come into contact with microfluidic cartridge 10 . Carrier materials may be selected from a variety of materials including plastic films such as polypropylene films, paper, cardboard, and the like. Both sticker 32 and lid sticker 63 may come into contact with the fluid composition, and thus both may need to be designed to be free of substances that may chemically react with the fluid composition. .

Adhesives used on the sticker 32 or portions of the sticker 32 that may come into contact with the fluid composition, such as the adhesive used to bond the electrical circuit 52 to the microfluidic cartridge 10, are chemically compatible with the perfume mixture. It has also been found to be affected by the problem of whether or not it is likely to respond to Thus, for stickers 32 intended to cover the microfluidic die 51 or placed adjacent to the microfluidic die 51 where electrical circuitry 52 or fluidic compositions may be present, the adhesive preferably: It can be a silicone pressure sensitive adhesive.

As shown in FIGS. 8 and 14, combined or separate stickers 32 may be used for various purposes. FIG. 14 illustrates a sticker 32a disposed on the reservoir 16 for aesthetic purposes or to convey instructions or provide information regarding the cartridge, and a micrometer to cover the nozzle prior to use. It includes a sticker 32 b disposed on the fluidic die 51 and a sticker 32 c covering the microfluidic die 51 and one or more cartridge connectors 36 on the microfluidic cartridge 10 . All of the stickers 32 shown in Figure 14 may comprise a silicone pressure sensitive adhesive for chemical compatibility.

Claims (7)

1. A microfluidic cartridge for delivering a composition comprising a fluid composition, either on a surface or in the air, comprising :
inside and
outside and
a reservoir disposed within the interior of the microfluidic cartridge and configured to contain a fluid composition comprising a perfume mixture;
an electrical circuit disposed on the exterior of the microfluidic cartridge, the electrical circuit having a first end having electrical contacts and a second end opposite the first end; an electrical circuit comprising
A microfluidic die disposed external to the microfluidic cartridge, electrically connected to the second end of the electrical circuit and in fluid communication with the reservoir. die and
a silicone pressure sensitive adhesive bonding the electrical circuit to the exterior of the microfluidic cartridge. the first end of the electrical circuit is disposed on the exterior first surface and the second end of the electrical circuit is disposed on the exterior second surface; 2. The microfluidic cartridge of claim 1, wherein said microfluidic die is disposed on said second surface. 3. The microfluidic cartridge of claim 2, further comprising a sticker, said sticker comprising a silicone pressure sensitive adhesive. 4. The microfluidic cartridge of claim 3, wherein the sticker covers the microfluidic die. the microfluidic die comprising:
a semiconductor substrate comprising a plurality of thermal resistors;
a fluid flow substrate comprising a fluid feed channel and one or more fluid chambers, each fluid chamber actuated by one of said plurality of thermal resistors;
a nozzle plate comprising one or more nozzles, each nozzle in fluid communication with a fluid chamber;
The microfluidic cartridge of any one of claims 1-4, comprising a A microfluidic cartridge according to any preceding claim, wherein the fluid composition comprises at least 70% by weight of a perfume mixture, based on the total weight of the fluid composition. The microfluidic cartridge of any one of claims 1-6, further comprising a sticker disposed on the exterior of the cartridge, the sticker comprising a silicone pressure sensitive adhesive.