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:
Jul. 12, 2005
Filed:
Mar. 13, 2001
Takashi Kuroki, Sodegaura, JP;
Atsushi Shibuya, Sodegaura, JP;
Shoji Tamai, Sodegaura, JP;
Mitsui Chemicals, Inc., Tokyo, JP;
Abstract
A process of preparing a polyimide of the present invention comprises effecting an imidization reaction of a diamine and a tetracarboxylic dianhydride in a solvent containing 50 to 100% by weight of an equimolar composition of a nitrogen-containing cyclic compound indicated by chemical formula (1) below and a phenol indicated by chemical formula (2) below:in formula (1), X represents —CH— or —N(CH)—, and in formula (2), Rand Rmay be the same as, or different from, each other and represent each any one of —H, —OH, —CH, —CH, —CH, —CH, —CH, —CH, —CH, —CH, —CH, —CH, —OCH, —O(CH), —NO, —Cl, —Br and —F.