Highly-refractive plastic lens and process for making the lens

Details Highly-refractive plastic lens and process for making the lens Highly-refractive plastic lens and process for making the lens

1991-01-31

1992-06-30

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

523106, 524140, 524265, 524402, 524707, 528 76, 528 83, 528 85, C08K 519, C08L 7512

Patent

active

051263882

ABSTRACT:
The present invention relates to a process for producing a plastic lens having a high refractive index and profile regularity comprising forming a mixture of one or more of sulfur-containing aromatic polyisocyanate compounds, one or more of active hydrogen compounds selected from the group consisting of polyol compounds and polythiol compounds, and at least one internal mold releasing agent, and subjecting the resulting mixture to casting polymerization, and a plastic lens obtained according to the process.

REFERENCES:
patent: 4689387 (1987-08-01), Kajimoto et al.
patent: 4895879 (1990-01-01), Nelson et al.
patent: 5013496 (1991-05-01), Nagata et al.
patent: 5021503 (1991-06-01), Nagata et al.

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