| 摘要 |
PURPOSE:To prevent cracking of protective layers and information recording layers and deterioration in signals by incorporating an org. filler specified in the average grain size of particles at a specific ratio into an adhesive agent to be used for sticking of tightly stuck structure in which the recording layer is formed on the face of the sticking side of substrates. CONSTITUTION:This recording medium is made into the tightly stuck structure in which the information recording layer parts 3, 8 are formed on the faces of the sticking side of the substrates 1, 6. The org. adhesive agent having <=100mum average grain size of particles is incorporated at 5-70vol.% of the adhesive agent into the adhesive agent to be sued for sticking. There is not much effect of suppressing the volumetric shrinkage of the adhesive agent if the content of the org. filler is <=5vol.%. The properties of the adhesive agent are degraded and problem arises in adhesive power, whetherability, etc. if the content is >=70%. The bulkiness of the adhesive agent layer increases and the degraded oxidation resistance and adhesive power of the recording layers 3, 8 are caused if the average grain size of the particles of the org. filler to be incorporated into the adhesive layer 5 exceeds 100mum. The cracking of the protective layers 2, 7 and the recordings 3, 8 and the deterioration in signals are thereby obviated. |
