End capped polyalkylene carbonates having improved thermal stablity
US4104264A · kind A · utility
9Cited by
1References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 5, 1977 |
| Grant date | Aug 1, 1978 |
| Priority date | — |
| Expiry date | May 5, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/42
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polycarbonates, of the type formed by reacting an aliphatic or cycloaliphatic 1,2-monoepoxide with carbon dioxide and having substantially alternating units of epoxide and carbon dioxide, are improved in thermal stability by reacting the free hydroxyl groups thereon with a hydroxyl reactive sulfur compound. The resulting end capped polycarbonates are useful for producing molded products, films, and packages which are resistant to thermal degradation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.