Patent EA-003690-B1 (EA)
Title: Special steel canister for propellant-operated metering aerosols
Inventor: NAGEL JUERGEN
IPC: C22C38/42
Filed: 2000-05-24
Abstract: 1. Canister (1) for propellant operated metering aerosols consisting of a container (2) and a valve cup (8) with valve (9) embedded therein, characterised in that the container consists of an alloy containing 40.0 - 53.0% iron, 23.0 - 28.0% nickel, 19.0 - 23.0% chromium, 4.0 - 5.0% molybdenum, 0.0 - 2.0% manganese, 1.0 - 2.0% copper, 0.0 - 1.0% silicon, 0.0 - 0.045% of phosphorus, 0.0 - 0.035% sulphur and 0.0 - 0.020% carbon. 2. Canister according to claim 1, characterised in that the container consists of an alloy having the following composition: chromium 19.0 - 21.0%, nickel 24.0 - 26.0%, molybdenum 4.0 - 5.0%, copper 1.0 - 2.0%, manganese up to 2.0%, silicon up to 0.5% and carbon up to 0.02%, with iron substantially as the remaining ingredient. 3. Canister (1) for propellant-operated metering aerosols consisting of a container (2) and a. valve cup (8) with valve (9) embedded therein, characterised in that the container consists of an alloy having the following composition: iron 60.0 - 72.0%, nickel 9.0 - 13.0%, chromium 17.0 - 21.0%, molybdenum 2.0 - 3.0%, manganese 0.0 - 1.5%, silicon 0.0 - 1.5%, phosphorus 0.0 - 0.04%, sulphur 0.0 - 0.04% and carbon 0.0 - 0.03%. 4. Canister (1) for propellant-operated metering aerosols consisting of a container (2) and a valve cup (8) with valve (9) embedded therein, characterized in that the container consists of an alloy of 16.5 - 18.5% chromium, 11.0 - 14.0% nickel, 2.0 - 2.5% molybdenum, a maximum of 0.03% carbon and iron making up the remainder. 5. Canister according to one of claims 1 to 4, characterised in that the valve cup (8) consists of aluminium and is sealed with a gasket (10) and/or (18) relative to the interior of the container. 6. Canister according to one of claims 1 to 5, characterised in that the valve (9) contains one or more stainless steel springs (11), a valve stem (12), the metering chamber (13) and a valve body (14), the valve stem (12), the metering chamber (13) and/or the valve body (14) being made of steel, the alloy according to one of claims 1 to 3 and/or a plastic. 7. Canister according to one of claims 1 to 6, characterised in that the spring(s) (11) consist(s) of a stainless steel and the valve stem (12), the metering chamber (13) and the body of the valve (14) consist of polybutylene terephthalate. 8. Canister according to one of claims 1 to 7, characterised in that the valve stem (12) is sealed off from the valve cup (18) by a gasket (15) or (18). 9. Canister according to one of claims 1 to 8, characterised in that the gasket (10) and/or gasket (15) and/or gasket (18) consist or consists of an ethylene/propylene/diene terpolymer. 10. Canister according to one of claims 1 to 9, characterised in that the valve cup (8) consists of the same alloy as the container (2). 11. Canister according to one of claims 1 to 10, characterised in that the container withstands a bursting pressure of more than 30,000 hPa, preferably more than 100,000 hPa. 12. Canister according to one of claims 1 to 11, characterised in that the container withstands a bursting pressure of more than 200,000 hPa. 13. Canister according to one of claims 1 to 12, characterised in that the container has a wall thickness of 0.1 to 0.5 mm, preferably 0.15 to 0.35 mm. 14. Canister according to one of claims 1 to 13, characterised in that the container has a wall thickness of 0.19 to 3.0 mm. 15. Container for a canister (1) for propellant-operated metering aerosols, characterised in that the container consists of an alloy according to one of claims 1 to 4. 16. Container according to claim 15, characterised in that the container withstands a bursting pressure of more than 30,000 hPa, preferably more than 100,000 hPa. 17. Container according to claim 15, characterised in that the container withstands a bursting pressure of more than 200,000 hPa. 18. Container according to one of claims 15 to 17, characterised in that the container has a wall thickness of 0.1 to 0.5 mm, preferably 0.15 to 0.35 mm. 19. Container according to one of claims 15 to 18, characterised in that the container has a wall thickness of 0.19 to 3.0 mm. 20. Use of a canister according to claims 1 to 14 or a container according to one of claims 15 to 19 in an inhaler and/or for storing active substance formulations which contain 1,1,2,2-tetrafluoroethane and/or 1,1,1,2,3,3,3-heptafluoropropane as propellants. 21. Use of a canister according to claims 1 to 14 or a container according to one of claims 15 to 19 as in claim 20, characterised in that the formulation contains acid for stabilisation, ethanol as a cosolvent and ipatropium bromide, oxitropium bromide, tiotropium bromide, albuterol or fenoterol as active substance. 22. Use of a canister according to claims 1 to 14 or a container according to one of claims 15 to 19 as in claim 20 of 21, characterised in that the formulation contains acid for stabilisation, ethanol and ipatropium bromide, oxitropium bromide or tiotropium bromide as active substance. 23. Use of a canister according to Claims 1 to 14 or a container according to one of claims 15 to 19 as in claim 20, 21 or 22, characterised in that the formulation contains citric acid. 24. Use of a canister according to claims 1 to 14 or a container according to one of claims 15 to 19 as in claim 20, 21 or 22, characterised in that the formulation contains a mineral acid. 25. Use of a canister according to claims 1 to 14 or a container according to one of claims 15 to 19 as in claim 20, 21 or 22, characterised in that the formulation contains hydrochloric acid. 26. Process for producing a container (2) or a canister (1) consisting of a container (2) and a valve cup (8) with valve (9) embedded therein for propellant-operated metering aerosols, characterised in that the container (2) is stamped out from a sheet consisting of an alloy according to one of claims 1 to 4.