LOW WATER-ABSORBING ACRYL RESIN, FORMING MATERIAL OF SAME, INFORMATION MEMORY CARRIER MATERIAL AND LIGHT READING INFORMATION MEMORY PLATE MATERIAL

摘要

Data storage disks containing optically readable information made from a copolymer having low water absorption and good optical and mechanical properties, said copolymer being at least ternary and comprising (A) methyl methacrylate, and further comonomers selected from at least two of the groups (B) where R' is hydrogen or methyl and R'' is hydrogen or alkyl, and (C) where R''' is aliphatic or alicyclic hydrocarbon, and (D) styrene and/or alpha-methyl styrene.