Process for edge coating of lens blanks with in situ heat...

Details Process for edge coating of lens blanks with in situ heat... Process for edge coating of lens blanks with in situ heat...

C - Chemistry, Metallurgy

03

C

117/67

C03C 17/32 (2006.01) C03C 21/00 (2006.01)

Patent

CA 1056229

PROCESS FOR CUTTING AND EDGING CHEMICALLY PRE-STRENGTHENED FINISHED UNCUT LENS BLANKS WITHOUT LOSS OF IMPACT RESISTANCE ABSTRACT OF THE DISCLOSURE 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°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 reflec- tions from the lens and the resulting myopic rings around the periphery of the lens can also be reduced.

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