Patent ID: 9371429
Filing Date: 2016-06-21
CPC Classification: B01D,B01J,C07D,C08G,C08J,C08L

Claim Text:
1. A polymer of formula (I): where: n is an integer from 10 to 5,000; m is an integer from 10 to 5,000; Ar1 and Ar3 are the same or different and are residues derived from a tetra-hydroxy aromatic monomer, the tetra-hydroxy aromatic monomer being wherein R is the same or different and is H or a C 1 -C 8 alkyl, C 2 -C 8 alkenyl or C 3 -C 8 cycloalkyl group; and, Ar2 and Ar4 are the same or different and are residues derived from a tetra-halogenated aromatic monomer, the tetra-halogenated aromatic monomer being wherein X is F, Cl or Br, and R1 and R2 are the same or different and are wherein y is an integer from 1 to 8; with the proviso that when Ar1 is the same as Ar3 and Ar2 is the same as Ar4, R1 and R2 are not both —CN and when Ar1 is the same of Ar3, then Ar2 is different from Ar4 and when Ar2 is the same as Ar4, then Ar1 is different than Ar3.