| 摘要 |
<p>The present invention relates to a medicinal aerosol formulation product with improved chemical stability, comprising a pressurized metered dose inhaler, comprising an aerosol canister equipped with a metering valve provided with sealing rings and/or gaskets made of a vulcanisate of an elastomeric composition of a butyl rubber, a cross-linking agent for the butyl rubber, and an accelerator for the cross-linking agent, wherein the accelerator includes a polysulphide compound derived from a substituted dithiocarbonic acid or derivative thereof, wherein the pressurized metered dose inhaler contains in the aerosol canister a medicinal aerosol formulation containing a long acting ß2 agonist, a hydrofluorocarbon propellant, a co-solvent, and a mineral acid as a stabilizer for the active ingredient.</p> |
