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:
Sep. 26, 1989
Filed:
May. 24, 1988
Hiroshi Inoue, Hirakata, JP;
Tetsuji Hirano, Hirakata, JP;
Tadao Muramatsu, Hirakata, JP;
Yasuji Narahara, Hirakata, JP;
Ube Industries, Ltd., Yamaguchi, JP;
Abstract
A shaped and drawn aromatic imide polymer article, for example, a film or filament, is produced by shaping an aromatic polyamic acid solution containing an imidizing agent in a polar organic solvent while simultaneously imidizing a portion of the aromatic polyamic acid to an extent such that the resultant self-supporting precursory article contains 20% to 87% by weight of a volatile substance and has a tensile strength of at least 1.5 kg/mm.sup.2 and an ultimate elongation of at least 30%, by drawing the precursory article at a draw ratio of 1.3 or more and by heat-treating the drawn article at a temperature of 150.degree. C. or more.