9-aryl and bisaryl substituted polyfluorenes

Stock material or miscellaneous articles – Composite – Of inorganic material

Reexamination Certificate

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C428S917000, C313S504000, C313S506000, C257S040000, C257SE51032, C528S394000, C528S397000, C528S401000, C528S422000, C528S423000

Reexamination Certificate



A polymer formed from optionally substituted first repeat units of formula (I) wherein Ar is selected from (a) aromatic hydrocarbon substituted with at least one electron withdrawing group or electron withdrawing heteroaryl. The polymers have application in electroluminescent devices.

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