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 epsiloncaprolactone, 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.
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申请人 |
MINNESOTA MINING AND MANUFACTURING COMPANY |
发明人 |
BENJAMIN, SHARON R.;GOVEK, MICHAEL;HYDE, PATRICK D.;KO, JOHN H.;MARTIN, PHILIP G.;OXMAN, JOEL D.;PARISH, JR., WILLIAM L.;SEDLOCK, CAROLE;SEVERANCE, RICHARD L.;UBEL, F. ANDREW;WILLIAMS, TODD R. |