Patent ID: 8470944

Claim:
A vinyl addition polynorbornene polymer derived from norbornene, at least one norbornene-type monomer selected from hydroxyhexafluoroisopropyl norbornene (HFANB) and norbornene-methoxymethylhexafluoropropanol (HFIBONB), and at least one other norbornene-type monomer selected from methyl glycidyl ether norbornene (MGENB), glycol norbornene (GlycolNB), 5-decyl-2-norbornene (DeNB), hexyl norbornene (HxNB), butyl norbornene (NB-butyl), phenylethyl norbornene (PENB), trimethoxysilyl norbornene (TMSNB), triethoxysilyl norbornene (TESNB), 5-norbornene-2-methanol acetate (MeOAcNB), N-(bicyclo[2.2.1]hept-5-en-ylmethyl)-1,1,1-trifluoromethanesulfonamide (TFSNB) and bicyclo[2.2.1]hept-5-ene-2-tert-butyl-carboxylate (tBuEsNB) and wherein said polymer is having a weight average molecular weight (Mw) of at least about 400,000 and is useful in the preparation of a pervaporation membrane having a separation factor of at least about 10.