Suitable additional components include polymers such as poly(alkylene oxides), polyvinyl alcohols, polypyrrolidones such as polyvinyl pyrrolidones, water soluble polyacrylates such as polyacrylic acid, poly(hydroxymethyl methacyrlate), and the like; biodegradable polymers and blends of biodegradable polymers selected from poly(L-lactic acid) (PLLA), poly(lactic acid-co-glycolic acid) (PLGA), polya