公开(公告)号：EP0209382A3

公开(公告)日：1988-01-13

申请号：EP86305493

申请日：1986-07-16

申请人： MITSUBISHI PETROCHEMICAL CO., LTD. ,  MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

发明人： Inoue, Takao ,  Sakairi, Tadashi ,  Aritomi, Mitsutoshi Mitsubishi Petrochem. Co. Ltd. ,  Takeyama, Tadao Mitsubishi Petrochem. Co. Ltd. ,  Matuo, Takahiro

IPC分类号： B29C39/00 ,  B29C35/02

CPC分类号： B29C35/0222 ,  B29C35/02 ,  B29C35/08 ,  B29C39/006 ,  B29K2033/04

摘要： A mixture of polyfunctional (meth)acrylate compound containing a C2-50 alcohol residue (100 parts),0.01-10 parts by wt of a radical initiatior and optionally up to 10 wt % of another radical polymerisable monomer as viscosity controller (e.g. styrene) is poured into a mold (formed by a ring on a glass plate), and polymerised at 10-200°C for not more than 2 hours under heating, light or electron beam irradiation, until the glass transition temperature (Tg) is 10 to 100°C, and the transparent plastics disc formed is removed from the mold without breakage. The substrate is then post-cured on a flat surface by heating or UV or electron beam irradiation until its Tg is 150°C, and preferably further post-cured until its Tg is 200°C, to remove residual strain and double bonds. A recording layer for an optical or magneto-optical disc is formed on the substrate; a higher post-curing temperature reduces the number of pinholes in the layer.