prov:value
| - In a preferred embodiment, the softenible material is a polymer that is generally hydrophilic, such as poly(ethylene oxide), polyvinyl pyrrolidone, polyvinyl alcohol, poly(ethylene glycol), polyacrylamide, poly(hydroxy ethyl acrylate), poly (hydroxy alkyl methacrylate) (such as poly(hydroxy ethyl methacrylate) (poly(HEMA))), hydrophilic polyurethanes, HYPAN and oriented HYPAN (block copolymers of
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