Melt-processible semicrystalline block copolyimides
US6444783B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2000 |
| Grant date | Sep 3, 2002 |
| Priority date | — |
| Expiry date | Dec 21, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/1042
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Segmented, melt-processible, semicrystalline copolyimides are disclosed herein. These polymers are comprised of an amorphous or semicrystalline A segment (soft segment) and a semicrystalline B segment (hard segment), wherein the level of semicrystallinity in the A segment is less than that in the B segment. These copolyimides are semicrystalline and exhibit melting points in the range from about 330-395° C. In preferred embodiments, these copolyimides are end-capped and are crystallizable from their melts (i.e., they exhibit recoverable semicrystallinity). These copolyimides either inherently have suitably low melt visocosities to be melt-processible or can be made to have suitably low melt viscosities to be melt-processible by addition of certain additives. Tailoring of the melting points and glass transition temperatures of these copolyimides can be effected by changing their molecular architecture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.