Cyclic carbonate monomers and ring opened polycarbonates therefrom
US9951179B2 · kind B2 · utility
1Cited by
17References
12Claims
0Family size
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Key dates
| Filing date | Feb 20, 2017 |
| Grant date | Apr 24, 2018 |
| Priority date | — |
| Expiry date | Feb 20, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/30
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Eight-membered ring cyclic carbonates having an oxygen or an acylated nitrogen at position 6 were prepared by reaction of precursor diols with ethyl chloroformate. The cyclic carbonates undergo organocatalyzed ring opening polymerization. In one instance, the initial polymer formed comprises a carbonate repeat unit having a Boc-protected nitrogen in the polymer backbone. Deprotecting the nitrogen with acid forms a cationic carbonate repeat unit having a positive charged secondary ammonium nitrogen in the polymer backbone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.