The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 10, 2005
Filed:
Oct. 08, 2002
Kyung-hee You, Seoul, KR;
Kwan-soo Han, Seoul, KR;
Tae-hyung Rhee, Sungnam-shi, KR;
Eun-ji Kim, Seoul, KR;
Jung-hee Kim, Seoul, KR;
Woo-hyeuk Jang, Yongin-shi, KR;
Kyung-Hee You, Seoul, KR;
Kwan-Soo Han, Seoul, KR;
Tae-Hyung Rhee, Sungnam-shi, KR;
Eun-Ji Kim, Seoul, KR;
Jung-Hee Kim, Seoul, KR;
Woo-Hyeuk Jang, Yongin-shi, KR;
Samsung Electronics Co., Ltd., Suwon-si, KR;
Abstract
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.