Polyimides, a process for their preparation and their use
US4629777A · kind A · utility
90Cited by
5References
29Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 10, 1984 |
| Grant date | Dec 16, 1986 |
| Priority date | — |
| Expiry date | May 10, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/107
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Homopolyimides and copolyimides of aromatic tetracarboxylic acids and aromatic diamines which are substituted in the two ortho-positions relative to at least one N atom by alkyl, alkoxy, alkoxyalkyl, cycloalkyl or aralkyl, are soluble in organic solvents and have increased glass transition temperatures and hence very good heat stabilities. Such polyimides, which contain radicals of a benzophenonetetracarboxylic acid, are radiation-sensitive and autophotocrosslinkable. The polyimides are suitable for the production of films, protective coatings and photographic relief images.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.