Method for blocking a lens blank, adhesive composition and use of the latter in lens blocking
US8382932B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 28, 2008 |
| Grant date | Feb 26, 2013 |
| Priority date | — |
| Expiry date | Mar 7, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2666/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A new lens blocking material (adhesive composition 78) is proposed that essentially overcomes the drawbacks of previous blocking materials. This new material combines traditional UV and/or visible light (VIS) curable polymer materials with specially selected filler (s) as a non polymerizing solid in order to achieve or improve certain desirable material properties, including those of low shrinkage, low exothermic heat of polymerization, and improving the ability to deblock, while simultaneously reducing the high cost associated with such UV/VIS radiation curable materials. The new material is being used in methods for blocking a lens blank (54) onto a lens block (62) with a lens mounting face (64) that has a predetermined block curve, in which the number of different block curves required to cover the full range of standard lenses is minimized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.