| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a plastic lens that uses a polymer having aβ-phellandrene, which is a material obtainable from microorganisms, plants or the like such as carbon-neutral materials, as monomers.SOLUTION: A plastic lens is characterized in that: (1) aβ-phellandrene polymer with specific gravity equal to or more than 0.85 and less than 1.0 and all light transmittance equal to or more than 90% is included at 50 to 100 mass% relative to total mass; (2) a number-average molecular weight Mn of theβ-phellandrene polymer is equal to or more than 40,000; (3) at least a portion of olefinic carbon-carbon double bonds owned by theβ-phellandrene polymer is hydrogenated; (4) a hydrogenation rate of theβ-phellandrene polymer is equal to or more than 70%; and (5) a refractive index of theβ-phellandrene polymer falls within a range of 1.45 to 1.60.</p> |
