Plastic lenses for spectacles

Details Plastic lenses for spectacles Plastic lenses for spectacles

C - Chemistry, Metallurgy

08

G

C08G 18/38 (2006.01) C08G 18/24 (2006.01) C08G 18/75 (2006.01) C08G 18/77 (2006.01) G02B 1/04 (2006.01)

Patent

CA 2337955

To provide plastic lenses for spectacles, having a high refractive index and a high Abbe's number, and having good transparency, heat resistance, mechanical strength and impact resistance. Provided are plastic lenses for spectacles, which are produced through polymerization of an epithio group-having compound (a), a polythiol compound (b) and a polyisocyanate compound (c) whereby the ratio of the polythiol compound (b) to the polyisocyanate compound (c) is at least 2.0 in case of a sulfur-free polyisocyanate compound (c o) and is at least 1.2 in case of a sulfur- containing polyisocyanate compound (c s), calculated on the basis of mol-amounts of -SH and - NCO groups The invention also provides a process for preparing such lenses and a catalyst for use in said process.

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