Star-shaped poly(propylene fumarate) copolymers for 3D printing applications
US11661477B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 2019 |
| Grant date | May 30, 2023 |
| Priority date | — |
| Expiry date | Sep 10, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G63/83
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
In various embodiments, the invention relates to poly(propylene fumarate) (PPF)-based star-shaped copolymers synthesized using a core-first approach that uses a multi-functional alcohols as an initiator, and Mg(BHT)2(THF)2 as catalyst for controlled ring opening copolymerization (ROCOP) of maleic anhydride (MAn) with propylene oxide (PO). In some embodiments, these star-PPF copolymers have lower viscosities than their linear analogs, allowing a decrease in DEF fraction in resin formulation, as well as the use of higher molecular weights. These star-shape PPF can be used to prepare PPF:DEF resins containing as much as 70% by weight of the multi-arm PPF star copolymers, and have a low complex viscosity of high M star PPF resin that affords rapid printing with a M nearly eight times larger than the largest linear PPF oligomer printed previously.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.