Polyvinylsiloxane impression material
US6561807B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 1, 2002 |
| Grant date | May 13, 2003 |
| Priority date | — |
| Expiry date | Mar 1, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G77/80
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Improved two component polymerizable polyorganosiloxane compositions are described, particularly for use in making dental impressions, having improved tear strength and wettability. Improved tear strength results from inclusion of a quadri-functional polysiloxane having a vinyl content of 0.16 to 0.24 m-mole/g. Working time is maintained by including sufficient amounts of a retarder composition that delays onset of the vinyl polymerization. Wettability is improved by including a surfactant resulting in a surface contact angle with water at three minutes of less than 50°. The surfactant chosen has an HLB of 8-11, such that the wetting contact angle is achieved within less than two minutes and remains wetting throughout the working time of the impression taking, substantially improving impression quality. A low viscosity impression material is provided and includes a base component and a catalyst component. Both components are siloxane-based materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.