| 摘要 |
An optical material with a high refractive index comprising a resin which is obtainable by polymerization and curing of a composition comprising the following components (A), (B) and (C): component (A): a sulfur-containing (meth)acrylic monomer represented by the following formula [I], or a mixture of the monomer [I] and a sulfur-containing (meth)acrylic monomer represented by the following formula [II]: <IMAGE> [I] <IMAGE> [II] in each of which formulas, R1 represents a hydrogen atom or a methyl group, R2 and R3 independently represent a hydrocarbyl group of 1 to 12 carbon atoms, X represents a halogen atom except fluorine, and n represents 0 or an integer of 1 to 4, provided that those groups which are in plurality may be the same or different, the weight ratio of the compound [I]/the compound [II] being from 10/0 to 1/9; component (B): a hydroxy(meth)acrylic monomer represented by the following formula [III]: <IMAGE> [III] wherein R5 represents a hydrogen atom or a methyl group, R4 represents a hydrocarbyl group of 1 to 20 carbon atoms which may or may not contain an ether oxygen atom, Y represents a halogen atom except fluorine, and m represents 0 or an integer of 1 or 2, provided that those groups which are in plurality may be the same or different, and p is 1 or 2, the weight ratio of the component (A)/the component (B) being from 95/5 to 50/50; and component (C): an isocyanate compound having a plurality of -NCO groups, the ratio (-NCO/-OH) of the number of -NCO group in the component (C) to the total number of -OH group in the components (A) and (B) being from 0.2 to 3. The above material for lenses has a low specific gravity and improved refractive index, transparency and impact resistance.
|
