Samsung Electronics Co., Ltd.

Kyung-Hee You

Tae-Hyung Rhee

Kwan-Soo Han

Eun-Ji Kim

Jung-Hee Kim

Woo-Hyeuk Jang

The present invention provides an optical polyimide precursor for use in making a polyimide. The precursor is defined by the following formula:wherein X is Cl, Br, oxo-halide, or fully halogenated alkyl, and A is a divalent aromatic or halogenated aromatic moiety. The present invention provides a method of preparing a diamine compound for use as an optical polyimide precursor. The method includes the steps of dissolving 2-chloro-5-nitrobenzotrifluoride and a diol in N,N-dimethylacetamide to form a solution, adding potassium carbonate, tert-butylammonium chloride and copper powder to said solution and heating the resulting mixture, removing the copper, precipitating and recrystallizing a dinitro-compound resulting from heating the mixture, and dissolving the dinitro-compound and reducing the dinitro-compound to yield a diamine compound.

Optical polyimide precursor, optical polyimide compound and fabricating method thereof

A polyimide for optical communications, which is expressed by the formula (1)

Polyimide for optical communications

A polyimide for optical communications, which is expressed by the formula (1), a method of preparing the same, and a method of forming multiple polyimide films using the polyimide, wherein the formula (1) is given by

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Seoul, South Korea

Kyung-Hee You