Plastic lenses having a high-refracting index and process...

B - Operations – Transporting – 29 – D

Patent

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B29D 11/00 (2006.01) B29C 33/60 (2006.01) C08G 18/38 (2006.01) C08K 5/098 (2006.01) C08K 5/19 (2006.01) C08K 5/521 (2006.01) C08L 75/04 (2006.01) G02B 1/04 (2006.01)

Patent

CA 1320806

- 36 - ABSTRACT OF THE DISCLOSURE The present invention relates to a process for preparing plastic lenses having a high-refractive index comprising forming a mixture containing one or more of polyisocyanate compounds; one or more active hydrogen compounds selected from the group consisting of a polyol compound having no sulfur atom, a polyol compound having at least one sulfur atom, and a polythiol compound having at least one sulfur atom in addition to the sulfur atom contained in mercapto group and at least one internal releasing agent and then casting and polymerizing the mixture.

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