Sulfur-containing urethane-based resin and composition and proce

Details Sulfur-containing urethane-based resin and composition and proce Sulfur-containing urethane-based resin and composition and proce

1997-10-07

2000-08-08

Short, Patricia A.

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

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 85, C08G 1838, C08G 1852

Patent

active

06100362&

ABSTRACT:
A 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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