Patent ID: 6900273
Filing Date: 2005-05-31
Classification: C08L,G02B

Abstract:
1. An optical part using a molding material being obtained by molding a resin composition (a) comprising the following polymers (A) and either or both of (B) and (C): (A) a polymer comprising monomer units which are one or more kinds of indene and indene derivatives represented by the following general formula (I); (B) a polymer consisting of monomer units which are styrene or styrene derivatives; (C) a polymer comprising monomer units which are styrene or styrene derivatives, and a monomer unit copolymerizable with styrene or a styrene derivative selected from the group consisting of styrene, nucleus-substituted alkylstyrenes, nucleus-substituted aromatic styrenes, α-substituted alkylstyrenes, β-substituted alkylstyrenes, nucleus-substituted alkoxystyrenes, alkyl vinyl ethers, aromatic vinyl ethers isobutene, diisobutylene, and (meth)acrylic esters having 1 to 8 carbon atoms; wherein R wherein the saturated water absorption is 0.4% or less, and the birefringence in stretching the resin composition by 200% is in the range of −2×10