摘要 |
The present invention provides thermoplastic ophthalmic lens blocking compositions that have many advantages over traditional metal alloy materials. Preferred 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. In one embodiment, the composition is used to fill the cavity between a preformed lens block and a lens. In another embodiment the composition is used to form a lens block. Methods of holding a lens blank are taught. Tapes that provide a receptive surface against which the composition may be adhered are disclosed. |
申请人 |
MINNESOTA MINING AND MFG. CO., SAINT PAUL |
发明人 |
BENJAMIN, R.;SEVERANCE, L.;KO, H.;PARRISH, L.;WILLIAMS, R.;SEDLOCK, CAROLE;MARTIN, G.;OXMAN, D.;UBEL, ANDREW;GOVEK, MICHAEL;HYDE, D. |