Copolyoxadiazoles of block type and process for their synthesis
US5486592A · kind A · utility
0Cited by
9References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1994 |
| Grant date | Jan 23, 1996 |
| Priority date | — |
| Expiry date | Oct 6, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention provides block copolymers of the formula: ##STR1## in which R represents an aliphatic residue, A an aromatic residue, x is such that the inherent viscosity (measured in methanesulphonic acid at a concentration of 0.2 g per deciliter at 30.degree. C.) in deciliters per gram is greater than 0.6, and n and n' are greater than or equal to 2. These polymers are made from two different diacids and have two glass transition temperatures, with one glass transition temperature being between -50.degree. and +50.degree. C. and the other glass transition temperature being between 180.degree. and 300.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.