Radiation curable compositions and composite articles made using an additive manufacturing process
US11553996B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 2018 |
| Grant date | Jan 17, 2023 |
| Priority date | — |
| Expiry date | May 22, 2039 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F222/1065
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A radiation curable composition including at least one radiation hardenable component, a photo-initiator, and a filler material having a population of particulates in an amount greater than or equal to 50% by weight of the printable composition. The population of particulates exhibits a median diameter (D50) of greater than or equal to 0.3 micrometer on a volume-average basis as determined using the Particle Size Test Method, and the radiation curable composition exhibits a viscosity of less than or equal to 150 Pa s when measured using the Viscosity Test Method. A method, apparatus, and systems for producing composite articles by selectively exposing a portion of the radiation curable composition to a source of actinic radiation to at least partially cure the exposed portion of the radiation curable composition, thereby forming a hardened layer, preferably by an additive manufacturing process such as stereophotolithography, are also described. The composite articles may include composite dental restorations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.