| abstract |
PURPOSE: To obtain a disc which is not warped and twisted in a humid environment and has no double refraction, by using the polymer of specific α and β unsaturated carboxylates as a base material. n CONSTITUTION: As the base material of an optical information recording disc, the polymer which is obtained by polymerizing one kind of monomer, at least, of ester between α and β unsaturated carboxylic acid such as acrylic acid and methacrylic acid and alicyclic alcohol such as cyclohexanol and dimethyl cyclohexanol and has a ≥51°C glass transition point is used. n COPYRIGHT: (C)1982,JPO&Japio |