Dental impression material utilizing ruthenium metathesis catalyst
US6649146B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 6, 2001 |
| Grant date | Nov 18, 2003 |
| Priority date | — |
| Expiry date | Dec 13, 2021 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K6/90
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A composition for use as a dental impression material including a polymerizable resin consisting of oligomers or polymers functionalized with groups curable by ring opening metathesis polymerization. These oligomers or polymers are end-capped and/or tethered with said functional groups. The composition also includes a ruthenium carbene complex catalyst, whereby the catalyst initiates ring-opening metathesis polymerization of the composition. The invention includes a paste/paste system in which a base paste includes the polymerizable oligomer or polymer and an inorganic dental filler system and in which a catalyst paste includes the catalyst dissolved in an inert solvent and an inorganic dental filler system. The oligomer or polymer may be, for example, one or a combination of a telechelic polydimethylsiloxane end-capped with norbornenyl groups, a polydimethylsiloxane tethered and end-capped with norbornenyl groups, a tri-functional polydimethylsiloxane end-capped with norbornenyl groups, or a quadri-functional polydimethylsiloxane end-capped with norbornenyl groups. The catalyst may be, for example, a ruthenium carbene complex with a ligand having a basicity higher than tricyclohex…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.