Poly(ether ketone ketone) polymers, corresponding synthesis methods and polymer compositions and articles made therefrom
US11732090B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 19, 2017 |
| Grant date | Aug 22, 2023 |
| Priority date | — |
| Expiry date | Dec 20, 2040 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2650/40
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Described herein are PEKK polymers having improved processability and improved crystallinity. It was surprisingly found that PEKK polymers formed using a specifically adapted nucleophilic synthesis route, in which different monomers are added in to the polymerization reaction at different points during the synthesis, had lower glass transition temperatures (“Tg”) and increased crystallinities, relative to PEKK polymers formed using traditional nucleophilic synthesis routes (“traditional PEKK polymers”). Furthermore, compared with PEKK polymers synthesized using an electrophilic synthesis routes, the PEKK polymers described herein and significantly lower halogen content. The synthesis routes includes a first heating of a first monomer blend in a reaction mixture, a subsequent first addition of a second monomer blend to the reaction mixture, and a second heating of the reaction mixture subsequent to the first addition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.