| 发明名称 |
MAGNETIC TAPE BASE FILM |
| 摘要 |
A polyester film suitable for use as a substrate for magnetic recording media, characterized in that said polyester film is a biaxially oriented polyester film having an average refractive index &upbar& n and a planar orientation DELTA P, which respectively satisfy the following equations [I] and [II]: &upbar& n>/=1.600 [I] DELTA P</=(1.43x &upbar& n)- 2.128 [II] and the surface roughness of the film is 0.015 mu m or lower. |
| 申请公布号 |
GB2124137(A) |
申请公布日期 |
1984.02.15 |
| 申请号 |
GB19830014485 |
申请日期 |
1983.05.25 |
| 申请人 |
* DIAFOIL COMPANY LIMITED |
发明人 |
SHIGEO * UTSUMI;TATEO * KANESAKI;TAKASHI * KAGIYAMA;SATOSHI * OTONARI;KOICHIRO * IKUSHIMA;NORIO * OKUMURA |
| 分类号 |
B29C49/00;B29C55/00;B29C55/12;C08L67/02;G11B5/73;(IPC1-7):29D7/02 |
主分类号 |
B29C49/00 |
| 代理机构 |
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