发明名称 |
Polycarbonate resin for substrate of optical recording medium |
摘要 |
<p>A polycarbonate resin obtained by polymerizing an aromatic diol and a carbonate-forming compound using a monophenolic compound as a molecular weight modifier, wherein said polycarbonate resin contains from 0.2 to 2% by weight of a low-molecular weight compound represented by formula (I): <CHEM> wherein R<1> represents an aromatic diol residue; and R<2> represents a monophenolic compound residue, and wherein said polycarbonate resin provides less amount of low-molecular weight volatile matters even when heated or injection-molded. When heated at 350 DEG C under reduced pressure of 1 mmHg for 20 minutes, the proportion of the low-molecular weight compound of formula (I) which volatilizes is not more than 0.2% by weight based on the weight of said low-molecular weight compound of formula (I) present in the polycarbonate resin. When heated at 400 DEG C under reduced pressure of 1 mmHg for 30 minutes, the proportion of the low-molecular weight compound of formula (I) which volatilizes is not more than 2% by weight based on the low-molecular weight compound of formula (I) present in the polycarbonate resin.</p> |
申请公布号 |
EP0894816(B1) |
申请公布日期 |
2003.05.21 |
申请号 |
EP19980114164 |
申请日期 |
1998.07.29 |
申请人 |
MITSUBISHI CHEMICAL CORPORATION |
发明人 |
MIYAMOTO, MASAAKI;UEDA, MOTONORI |
分类号 |
C08G64/24;G11B7/243;G11B7/253;(IPC1-7):C08G64/14;G11B7/24 |
主分类号 |
C08G64/24 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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