Optical terpolymer of polyisocyanate, polythiol and polyene monomers
AssigneeOptima, Inc.
InventorsZhou Yang, Yin-Nian Lin, Zhenya Zhu, Brian George Risch
Life of this patent
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Abstract
A monomer composition characterized by being curable to form a resin suitable for optical products having a balanced refractive index and Abbe's number range and good tintability comprising a polyene monomer; and polyisocyanate, polyisothiocyanate, or an isocyanate monomer containing at least one isothiocyanate group; and a monomer having two or more active hydrogen groups such as polythiols, polyamines, and polyols. The invention also provides a special process for making the composition and for curing the composition to form a resin product.
Claims18
A monomer composition characterized by being curable and which is cured by reacting the composition at an elevated temperature to form a homogeneous terpolymer resin of the monomer composition which terpolymer has a single glass transition temperature, does not have any phase separation and is optically clear consisting essentially of:
- a first monomer represented by the formula:
- R(NCY)x
- wherein R is a hydrocarbon or substituted hydrocarbon radical, Y is oxygen or sulfur and x is two or more;
- a second polyene monomer wherein the polyene contains only vinyl functional groups;
- and
- a third polythiol monomer.
Dependencies are inferred from the claim text.