Thiourethane polymers, method of synthesis thereof and use in additive manufacturing technologies
US10899072B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 14, 2017 |
| Grant date | Jan 26, 2021 |
| Priority date | — |
| Expiry date | Apr 28, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2250/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A semi-crystalline thiourethane polymer. The semi-crystalline thiourethane polymer comprises a sequential chain of a first type of monomer covalently bonded to a second type of monomer via thiourethane linkages. Each of the first type of monomer includes two or more thiol functional groups and each of the second type of monomer includes two or more isocyanate functional groups. The first and second types of monomers are polymerized together in an anionic step-growth polymerization reaction that is catalyzed by a non-nucleophillic base having a pKa greater than 7, produced by photo-initiated decomposition of a photolatent base. A method of synthesizing, and polymer jetting and stereolithography methods of manufacturing a polymer part, are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.