| 摘要 |
PURPOSE:To provide an optical resin material having reduced optical distortion and excellent heat resistance by compounding as a main component a polyether resin prepared by reacting an epihalohydrin with diols comprising specific amounts of 2,2'-biphenol and a 4,4'-bisphenol derivative. CONSTITUTION:An optical resin material suitable for optical disk substrates, etc., comprising a polyether resin prepared by polycondensing an epihalohydrin with diols comprising 20-80mole% of 2,2'-biphenol and 80-20mole% of a 4,4'- bisphenol deriwative [e.g. 2,2-bis(4-hydroxyphenyl)propane] in the presence of a strong alkali catalyst (e.g. sodium hydroxide) and having structured units of formulas I and II (R1 and R2 are 1-12C hydrocarbon groups; X is O, S, etc.; X1 and X2 are H, halogen, etc.; m and n are 0-4) as main repeating units, preferably in an amount of >=95wt.% is obtained. |
