Mercapto compound, its preparation process, and sulfur-containin

Details Mercapto compound, its preparation process, and sulfur-containin Mercapto compound, its preparation process, and sulfur-containin

1993-12-20

1994-10-04

Kight, III, John

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 60, 568 38, 568 57, 568 66, 568 69, 359642, C07C31906, C08G 1808

Patent

active

053527585

ABSTRACT:
A mercapto compound represented by the following formula (1): ##STR1## is obtained by reacting, in the presence of a mineral acid, thiourea with a compound represented by the following formula (2): ##STR2## wherein X means a hydroxyl group or a chlorine or bromine atom, and then adding a base to alkalinize the reaction mixture so that the reaction product is hydrolyzed.
The mercapto compound represented by the formula (1) can be reacted with at least one cyanate compound selected from the group consisting of polyisocyanate compounds, polyisothiocyanate compounds and isocyanate-group-containing isothiocyanate compounds to form a sulfur- containing urethane resin. A lens made of the resin is colorless and transparent, has high refractive index and low dispersion characteristics, and is excellent especially in heat resistance.

REFERENCES:
patent: 3544543 (1970-12-01), Greco et al.
patent: 4355185 (1982-10-01), Bergthaller et al.
patent: 5087758 (1992-02-01), Kanemura et al.

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