Semicrystalline pulverulent polyarylethersulfones and method to make them
US12209200B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 2022 |
| Grant date | Jan 28, 2025 |
| Priority date | — |
| Expiry date | Jul 27, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2250/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A semicrystalline polyarylethersulfone (PAES) useful for additive manufacturing may be made by a method comprising: dissolving an amorphous polyarylethersulfone in a polar aprotic halogenated hydrocarbon solvent at a temperature adequate to effectively form a solution, and subsequently and spontaneously bring about reprecipitation of a semicrystalline polyarylethersulfone from the solution. The semicrystalline polyarylethersulfone may have a crystallinity of at least 30% by weight. The semicrystalline PAES, upon being heated, melting and uniting together in layers during additive manufacturing cools without substantially recrystallizing, allows for deformation-free articles to be formed having low residual stress.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.