Carbonated beverages can have a substantially reduced concentration of water soluble materials derived from biaxially oriented thermoformed beverage containers. Such containers can comprise a permeant barrier and an active trap for water soluble materials that can be removed from the thermoplastic...http://www.google.com.au/patents/US5837339?utm_source=gb-gplus-sharePatent US5837339 - Rigid polymeric beverage bottles with improved resistance to permeant elution 
