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US 5,326,501 AGranted
Polythiol compound, and optical material and product produced therefrom
AssigneeHoya Corporation
InventorsTsuyoshi Ohkubo, Chau Nguyen, Reisuke Okada
Life of this patent
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Abstract
This invention relates to a polythiol compound and an optical material therefrom. Having a rigid 1,4-dithian ring which increases the refractive index and Abbe's number, the polythiol compound used for the production of an optical material imparts the optical material with high heat resistance and excellent mechanical properties as well as excellent optical properties.
Claims6
An optical material comprising a polymer obtained by polymerizing:
- a component (A) which at least contains a polythiol compound (a.sub.1) having the formula:
- ##STR8## wherein X is --(CH.sub.2 CH.sub.2 S)n.sub.2 --H, n.sub.1 is an integer of 1 to 5, and n.sub.2 is an integer of 0 to 2, and
- a component (B) which contains at least one member of a compound (b.sub.1) having at least two vinyl groups per molecule, a compound (b.sub.2) having at least two iso(thio)cyanate groups per molecule and a compound (b.sub.3) having at least one vinyl group and at least one iso(thio)cyanate group per molecule.
Dependencies are inferred from the claim text.