Polyimides comprising substituted benzidines
US5071997A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 20, 1989 |
| Grant date | Dec 10, 1991 |
| Priority date | — |
| Expiry date | Jul 20, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31721
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A new class of polyimides and copolyimides made from substituted benzidines and aromatic dianhydrides and other aromatic diamines. The polyimides obtained with said diamines are distinguished by excellent thermal, excellent solubility, excellent electrical properties such as very low dielectric constants, excellent clarity and mechanical properties making the polyimides ideally suited as coating materials for microelectronic apparatii, as membranes for selective molecular or gas separation, as fibers in molecular composites, as high tensile strength, high compression strength fibers, as film castable coatings, or as fabric components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.