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:
Dec. 12, 1989
Filed:
Mar. 07, 1988
Abstract
An aromatic hetero ring-containing polyimide comprising substantially equal equivalent amount of (1) structural units of Group 1 and (2) structural units of Group 2, wherein the structural units of Group 1 comprise (i) from 30 to 100 mol % of a unit of the formula: ##STR1## wherein X is S, O or NH, and (ii) from 0 to 70 mol % of a unit of the formula: ##STR2## wherein Ar.sub.1 is ##STR3## wherein each of y, y.sub.1, and y.sub.2 and y.sub.3 is a hydrogen atom, an alkyl group, an alkoxy group or a halogen atom, and each of Z, Z.sub.1 and Z.sub.2 is a single bond, --O--, --CH.sub.2 --, ##STR4## --C--, --SO.sub.2 --, --C(CH.sub.3).sub.2 -- or --C(CF.sub.3).sub.2, and the structural units of Group 2 comprise (i) from 70 to 100 mol % of a unit of the formula: ##STR5## and (ii) from 0 to 30 mol % of a unit of the formula: ##STR6## wherein Ar.sub.2 is ##STR7## wherein Z, y and y.sub.1 are as defined above, and/or a unit of the formula: ##STR8##