Conformable tape for bonding a thermoplastic lens blocking material
US5919563A · kind A · utility
18Cited by
46References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1996 |
| Grant date | Jul 6, 1999 |
| Priority date | — |
| Expiry date | Sep 13, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2891
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention provides a conformable tape for bonding a lens block comprising a thermoplastic lens blocking composition to an ophthalmic lens blank. Preferred tapes have a pressure sensitive adhesive layer and a polymer backing that comprises a polar moiety and a non-polar moiety. Preferred thermoplastic lens blocking compositions comprise a homopolymer or copolymer of epsilon-caprolactone, have a number average molecular weight between 3,000 and 100,000, and a polydispersity less than 10. The composition may also comprise one or more modifiers, fillers or heat absorbing materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.