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:
Feb. 27, 1990
Filed:
Jan. 05, 1989
Kouichi Kunimune, Chiba, JP;
Hirotoshi Maeda, Yokohama, JP;
Chisso Corporation, Osaka, JP;
Abstract
The present invention is connected with a low-melting polyimide copolymer containing 30 to 90 mole % of an imide repeating unit represented by the following formula (I) and 10 to 70 mole % of an imide repeating unit represented by the following formula (II), and having a logarithmic viscosity number of 0.1 to 4 dl/g: ##STR1## wherein R.sup.1 is at least one of ##STR2## Furthermore, the present invention is connected with a method of preparing the low-melting polyimide copolymer. Since having a melting point of about 300.degree. to about 400.degree. C., the polyimide copolymer of the present invention has heat resistance and enables melt-moldings such as extrusion and injection molding.