Polythiol useful for preparing sulfur-containing urethane-based

Details Polythiol useful for preparing sulfur-containing urethane-based Polythiol useful for preparing sulfur-containing urethane-based

1995-01-17

1997-03-04

Sweet, Mark D.

Organic compounds -- part of the class 532-570 series

Organic compounds

Sulfur containing

568 66, C07C32114

Patent

active

056081154

ABSTRACT:
A novel polythiol having four or more functional groups, a process for producing the polythiol comprising reacting thiourea with a specific compound, a sulfur-containing urethane-based resin prepared from the polythiol and a lens made of the resin. The resin has a high refractive index, and low dispersion of refractive index, is lightweight, colorless and transparent, has no optical distortion, and has excellent characteristics in weatherability, dye-affinity, heat resistance, impact resistance and machinability.

REFERENCES:
patent: 5087758 (1992-02-01), Kanemura et al.
patent: 5283312 (1994-02-01), Kanemura et al.

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