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:
Aug. 02, 2005
Filed:
Jul. 11, 2002
Kozo Tajiri, Suita, JP;
Masayoshi Kuwabara, Ibaraki, JP;
Yasunori Okumura, Toride, JP;
Tohru Matsuura, Tokyo, JP;
Noriyoshi Yamada, Tokyo, JP;
Kozo Tajiri, Suita, JP;
Masayoshi Kuwabara, Ibaraki, JP;
Yasunori Okumura, Toride, JP;
Tohru Matsuura, Tokyo, JP;
Noriyoshi Yamada, Tokyo, JP;
Nippon Shokubai Co., Ltd., Osaka, JP;
NTT Advanced Technology Corporation, Tokyo, JP;
Abstract
A polyimide excelling in heat resistance, chemical resistance, water repellency, dielectric characteristics, electrical characteristics, and optical characteristics and a polyamide acid useful as the raw material therefor are provided. Specifically, a polyamide acid containing a chlorine atom and a fluorine atom and comprising a repeating unit represented by the following formula (1):(wherein X and X' independently denote a divalent organic group; Y and Y′ independently denote a chlorine, bromine, or iodine atom; p and p′ denote independently denote the number of fluorine atom {F in the formula (1)} bonded to the relevant benzene ring, representing an integer of 0-3; q and q′ independently denote an integer of 0-3; and p+q total 3, and p′+q′ total 3).