Catalyst systems based on phenolate complexes for immortal ring-opening polymerization of cyclic esters and carbohydrates
US9512267B2 · kind B2 · utility
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20Claims
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Key dates
| Filing date | Aug 31, 2012 |
| Grant date | Dec 6, 2016 |
| Priority date | — |
| Expiry date | Feb 23, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G64/38
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method can include immortal ring-opening homopolymerisation of cyclic carbonates or cyclic esters in the presence of a catalytic system, or sequential two-step ring-opening block copolymerisation of one or more cyclic monomers selected from cyclic carbonates or cyclic esters in the presence of the catalytic system. The catalytic system can include a phenolate supported metallic complex. The catalytic system can also include an alcohol or a primary amine containing aliphatic and/or aromatic moieties. The alcohol or primary amine can be present in a molar ratio with respect to the metallic complex that is larger than 1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.