Process for preparing a copolymer
US9512268B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 2014 |
| Grant date | Dec 6, 2016 |
| Priority date | — |
| Expiry date | Mar 17, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L67/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for preparing a copolymer comprising subjecting a first cyclic ester having a ring size from 4 to 11 atoms and a second cyclic ester having a ring size from 12 to 40 atoms to ring-opening copolymerization using as catalyst a compound of formula I, wherein M is trivalent Al, Ti, V, Cr, Mn, Co, yttrium, Sc or lanthanides; X and X′ are both a heteroatom; Y and Y′ are O, N, S or P; Z is a substituent as described herein; L1 is an organic moiety linking X and Y; L2 is an organic moiety linking X′ and Y′; L3 is an organic moiety linking Y and Y′ and has a chain length between Y and Y′ of at least 2 atoms. The copolymer has a randomness of at least 0.5 and a number average molecular weight of at least 15000 g/mol.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.