Seals for use in an aerosol delivery device
AssigneeMinnesota Mining and Manufacturing Company
InventorOh-Seung Kwon
Life of this patent
Estimating the term…
Abstract
A device for delivering an aerosol, comprising: a casing member, a valve stem, and a diaphragm. The diaphragm contains a blend of (a) 100 parts by weight of a polyolefin random copolymer of about 80 to about 95 mole percent ethylene and a total of about 5 to about 20 mole percent of 1-butene, and (b) at least 10 parts by weight of a rubber comprising a styrene-ethylene/butylene-styrene block copolymer based on 100 parts by weight of polyolefin. The styrene-ethylene/butylene-styrene block copolymer is substantially uniformly dispersed within the polyolefin. The blend preferably has a Shore A hardness of 65 to 85.
Claims15
A device for delivering an aerosol, comprising:
- a valve stem, a diaphragm having walls defining a diaphragm aperture, and a casing member having walls defining a casing aperture, wherein the valve stem passes through the diaphragm aperture and the casing aperture and is in slidable sealing engagement with the diaphragm aperture, and wherein the diaphragm is in sealing engagement with the casing member and comprises a blend comprising (a) 100 parts by weight of a polyolefin random copolymer comprising about 80 to about 95 mole percent ethylene and a total of about 5 to about 20 mole percent of 1-butene, and (b) at least 10 parts by weight of a thermoplastic elastomer comprising a styrene-ethylene/butylene-styrene block copolymer based on 100 parts by weight of polyolefin,
- and wherein the styrene-ethylene/butylene-styrene block copolymer is uniformly dispersed within the polyolefin.
A device for delivering an aerosol, comprising:
- a valve stem,
- a diaphragm that comprises (a) 100 parts by weight of a polyolefin random copolymer comprising about 80 to about 95 mole percent ethylene and a total of about 5 to about 20 mole percent of 1-butene, and (b) at least 10 parts by weight of a rubber comprising a styrene-ethylene/butylene-styrene block copolymer based on 100 parts by weight of polyolefin, and wherein the styrene-ethylene/butylene-styrene block copolymer is uniformly dispersed within the polyolefin, the diaphragm having walls defining a diaphragm aperture, and
- a casing member having walls defining a formulation chamber and a casing aperture, wherein the valve stem passes through the diaphragm aperture and the casing aperture and is in slidable sealing engagement with the diaphragm aperture, and wherein the diaphragm is in sealing engagement with the casing member, the device having contained in the formulation chamber thereof a medicinal aerosol formulation, and wherein the diaphragm is stable to dimensional change when exposed to the medicinal aerosol formulation.
Dependencies are inferred from the claim text.