Patent ID: 8678203

Claim:
A method for the formation of a pervaporation membrane, comprising: a) dissolving a vinyl addition polynorbornene polymer having a weight average molecular weight (M w ) of at least about 5,000 in a suitable solvent to form a solution; b) pouring the polymer solution onto a substrate to form a first layer of film; c) peeling the first layer of the film from the substrate; c) drying the first layer of the film to form the membrane; and where the vinyl addition polymer is selected from the following: a terpolymer of norbornene (NB), phenethyl norbornene(PENB) and hydroxyhexafluoroisopropyl norbornene (HFANB); a terpolymer of norbornene (NB), 5-decyl-2-norbornene (DecyINB) and hydroxyhexafluoroisopropyl norbornene (HFANB); a terpolymer of norbornene (NB), glycol norbornene (GlycolNB) and hydroxyhexafluoroisopropyl norbornene (HFANB); a terpolymer of norbornene (NB), phenethyl norbornene (PENB) and norbornene-methoxymethylhexafluoropropanol (HFIBONB); a terpolymer of norbornene (NB), hexyl norbornene (H×NB) and hydroxyhexafluoroisopropyl norbornene (HFANB); and a terpolymer of norbornene (NB), butyl norbornene (BuNB) and hydroxyhexafluoroisopropyl norbornene (HFANB).