PHTHALIC ANHYDRIDE) POLYMER WITH 4,4''-OXYBIS(BENZENAMINE) AND 4,4''-SULFONYLBIS(BENZENAMINE))
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hexafluoroisopropylidene-2,2-bis(phthalic anhydride) pol.;PHTHALIC ANHYDRIDE) POLYMER WITH 4,4''-OXYBIS(BENZENAMINE) AND 4,4''-SULFONYLBIS(BENZENAMINE))