| abstract |
The present invention relates to a sulfur-containing polyureaurethane and a process for producing the polyureaurethane. In an embodiment, the invention relates to a sulfur-containing polyureaurethane having an index of refraction of at least 1.57, an Abbe value of at least 35, and a density of less than 1.3 g / cm 3 when at least partially cured. In addition, sulfur-containing polyureaurethanes can be prepared by reacting a polyureaurethane prepolymer comprising a polycyanate and at least one hydrogen-containing material, at least one episulfide-containing material, and an amine-containing curing agent. . |