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:
Mar. 15, 1994
Filed:
Dec. 11, 1991
Hirotoshi Maeda, Kanagawa, JP;
Kouichi Kunimune, Chiba, JP;
Chisso Corporation, Osaka, JP;
Abstract
The present invention provides a dehydrating agent which is less poisonous and which can be easily handled in producing a polyisoimide by dehydrating a polyamic acid. A process is also provided for producing a polyisoimide without requiring the separation of by-products. That is, the process for producing the polyisoimide of the present invention includes the step of using a dihyroquinoline derivative represented by the formula ##STR1## (wherein each R.sup.1 and R.sup.2 is independently a monovalent organic group having 1 to 8 carbon atoms) as the dehydrating agent in producing the polyisoimide by dehydrating the polyamic acid.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile