Process for producing mouldings
US6190603A · kind A · utility
10Cited by
9References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 22, 1999 |
| Grant date | Feb 20, 2001 |
| Priority date | — |
| Expiry date | Jan 22, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2011/0041
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A novel process for producing mouldings, especially contact lenses, is described, comprising the following steps: a) introducing into a mould a prepolymer containing photo crosslinkable groups that is liquid at room temperature or is readily meltable and is substantially free of solvents; b) initiating the photo cross-linking for a period of <20 minutes; c) opening the mould, so that the moulding can be removed for the mould. In accordance with the process according to the invention, it is possible especially to produce contact lenses having valuable properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.