发明名称 |
Intrinsically low birefringent molding polymers, process for preparation and molded objects therefrom. |
摘要 |
Intrinsically low birefringent molding polymers have a molten stress optic coefficient that is greater than or equal to -1000 Brewsters and less than or equal to +1000 Brewsters, a glass transition temperature of at least 140 DEG C, and a water absorption <IMAGE> according to ASTM D570-81 after 24 hours immersion in water at 23 DEG C) of less than 0.25 percent and comprise in polymerized form at least one structural component providing a positive melt homopolymer stress optic coefficient and at least one other structural component providing a negative melt homopolymer stress optic coefficient. They are particularly useful as substrates for optical storage discs. |
申请公布号 |
EP0431903(A2) |
申请公布日期 |
1991.06.12 |
申请号 |
EP19900313169 |
申请日期 |
1990.12.05 |
申请人 |
THE DOW CHEMICAL COMPANY |
发明人 |
MAUER, BRIAN R.;DIBBS, MITCHELL G. |
分类号 |
C08F8/32;C08F8/48;C08F12/08;C08F20/52;C08F22/36;C08F22/40;C08F212/00;C08F265/00;C08F267/10;G11B7/24;G11B7/253;G11B7/26 |
主分类号 |
C08F8/32 |
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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