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:
Oct. 01, 2002
Filed:
Feb. 05, 2001
Takashi Kuroki, Kanagawa, JP;
Yoshihiro Sakata, Kanagawa, JP;
Tomomi Okumura, Kanagawa, JP;
Atsushi Shibuya, Kanagawa, JP;
Yuichi Okawa, Kanagawa, JP;
Hideaki Oikawa, Fukuoka, JP;
Kayako Yanagihara, Kanagawa, JP;
Yasunori Yoshida, Kanagawa, JP;
Masaji Yoshimura, Kanagawa, JP;
Hiroyasu Kido, Kanagawa, JP;
Shoji Tamai, Kanagawa, JP;
Mitsui Chemicals, Inc., , JP;
Abstract
A thermoplastic polyimide having good thermal stability, comprising a repeating unit represented by the chemical formula (1), a molecular terminal being composed of the chemical formula (2) and/or chemical formula (3), characterized in that: a melt viscosity ratio calculated by the numerical formula (1) and/or the numerical formula (3) is within a numerical range shown in the numerical formula (2) and/or the numerical formula (4) and 1,3-bis(4-aminophenoxy)benzene represented by the chemical formula (3) for production of the above polyimide, characterized in that the content of an azo compound is from 0.0 to 0.2%. The thermoplastic polyimide of the present invention has excellent characteristics {circle around (1)} to {circle around (4)} described below. {circle around (1)} It is superior in thermal stability on melting. That is, the degree of lowering of the fluidity on melting with a lapse of time is small and it is possible to apply to conventional melt molding. {circle around (2)} It has high heat resistance. {circle around (3)} It is superior in productivity. {circle around (4)} It is superior in dimensional accuracy.