| 摘要 |
<p>A plastic lens material excellent in both optical and mechanical properties and, in addition, having a low specific gravity; and a process for preparing a plastic lens material having a low specific gravity and excellent various properties. This material comprises a copolymer produced by radical polymerization of a reaction product between a component (A) containing a polyhydric alcohol prepared by reducing a dimer and/or a trimer of a higher unsaturated fatty acid having 11 to 22 carbon atoms and a component (B) containing an isocyanate compound having in its molecule a radical-polymerizable unsaturated bond and a comonomer (C).</p> |
