Thermoplastic lens blocking material

Details Thermoplastic lens blocking material Thermoplastic lens blocking material

1997-03-17

1999-03-23

Evans, Elizabeth

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428217, 4284248, 428426, 451390, 351159, B32B 702

Patent

active

058857001

ABSTRACT:
The present invention provides thermoplastic ophthalmic lens blocking compositions that have many advantages over traditional metal alloy materials. Preferred compositions comprise a blend of (i) a hydrocarbon resin, preferably an aromatic hydrocarbon resin; (ii) a side chain crystallizable hydrocarbon polymer or copolymer; and (iii) optionally an modifier or mixture of modifiers, preferably straight chain alcohols. 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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