| 摘要 |
<p>An optical disc includes a pair of substrates, at least one of which has predetermined information pits formed on one surface. The two substrates are bonded with a hot-melt adhesive having (1) a softening point of not more than 140 DEG C., (2) a dry tensile adhesive strength of not less than 1 kg/cm2 at 20 DEG C. and (3) a melt viscosity of not more than 1,000 P at 160 DEG C.</p> |
