| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide performance to stably reflect the light in the constant direction up to a high temperature in continuous use from a low temperature when lighting without being deformed even if a sub-reflector is exposed for many hours to a high temperature by heating in the vicinity of a lamp by using a thermoplastic hydrocarbon polymer having a saturated hydrocarbon ring. SOLUTION: A thermoplastic hydrocarbon polymer having a saturated hydrocarbon ring is used as a molding material resin. A norbornene resin, a hydrocarbon polymer having a saturated ring molecular structure of a carbon-carbon 5 to 8-membered ring by connecting a part or the whole of a repetitive unit by a 1,4-bond and/or a 1,2-bond and a hydrogen compound of a polymer by polymerizing a vinyl group containing ring hydrocarbon monomer, are used as such a thermoplastic hydrocarbon polymer. Therefore, performance such as heat resistance can be improved, a complicated large mold can be formed, and molding accuracy for a thin part can be improved.</p> |
