Coating processes – Optical element produced – Transparent base
Patent
1976-09-02
1978-02-28
Hoffman, James R.
Coating processes
Optical element produced
Transparent base
428 80, 428 81, G02B 110, B05D 302, B05D 138, B05D 506
Patent
active
040768635
ABSTRACT:
The decrease in the impact resistance of the chemically pre-strengthened finished ophthalmic lens blanks due to the subsequent cutting and edging process can be prevented by coating the edge with at least one material selected from epoxy resins, alkyd resins, polyurethane resins, unsaturated polyester resins, acrylic resins or cyanoacrylates, polymerization of which can be completed by heating at a temperature of up to 200.degree. C, by single coating, overlap coating or multiple-layer coating, and then polymerizing the edge coating or coatings to form a polymeric film. Also, if a black pigment is added to any of the starting material compositions for said resins, internal reflections from the lens and the resulting myopic rings around the periphery of the lens can also be reduced.
REFERENCES:
patent: 1507327 (1924-09-01), Wrighton
Namiki Kazuo
Onoki Fumio
Osora Tetsuo
Gilbert Stephen P.
Hoffman James R.
Hoya Lens Corporation
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