Patent ID: 9440185
Filing Date: 2016-09-13
CPC Classification: B01D,B29C,B29D,B29K,B29L,Y02C,Y02P

Claim Text:
1. A polymer membrane comprising a crosslinked thermally rearranged poly(benzoxazole-co-imide) having a repeating unit represented by the following Chemical Formula 1: wherein, in Chemical Formula 1, Ar is an aromatic cyclic group selected from substituted or non-substituted tetravalent C6-C24 arylene groups and substituted or non-substituted tetravalent C4-C24 heterocyclic groups, wherein the aromatic cyclic group is present alone; two or more of the aromatic cyclic groups form a condensed ring together; two or more of the aromatic cyclic groups are linked to each other via O, S, CO, SO 2 , Si(CH 3 ) 2 , (CH 2 ) p (1≦P≦10), (CF 2 ) q (1≦q≦10), C(CH 3 ) 2 , C(CF 3 ) 2 or CO—NH, Q is a single bond; or O, S, CO, SO each of x and y represents a molar fraction in the repeating unit, wherein 0.8≦x≦0.95, 0.05≦y≦0.2 and x+y=1.