Method for polymerizing macrocyclic poly(alkylene dicarboxylate) oligomers
US5389719A · kind A · utility
32Cited by
5References
11Claims
0Family size
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Key dates
| Filing date | Jun 20, 1994 |
| Grant date | Feb 14, 1995 |
| Priority date | — |
| Expiry date | Jun 20, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/85
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Cyclic tin catalysts are employed for the preparation of branched polyesters from macrocyclic polyester oligomers. They are less susceptible than previously known catalysts to the presence of acidic impurities in the oligomer compositions,
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.