| 摘要 |
PURPOSE:To obtain an optical disk substrate with excellent solvent resistance, heat resistance and low moisture absorptivity by incorporating acrylic polymers having >=5wt.% specific recurrent unit into the substrate. CONSTITUTION:The substrate contains acrylic polymer having >=5wt.% recurrent unit expressed by formula I. In formula I, R<1> represents hydrogen atom or methyl group, R<2> represents alicyclic alkyl group substituted with cyano group. The polymn. temp. is selected from a range 0 - 200 deg.C, and more preferably 50 - 120 deg.C. The solvent for the solution polymn. is benzene, toluene, xylene, methylethylketone, methylisobutylketone, ethyl acetate, butyl acetate, ethylene dichloride, etc. The obtd. substrate has excellent solvent resistance, heat resistance and low moisture absorptivity. |
