发明名称 |
Polycarbonate formulation and carrier for semiconductor wafers |
摘要 |
<p>An aromatic polycarbonate composition and articles made from same having less than 300 parts per billion each of ionic impurities, particularly Sulfate and Chloride ions prepared by devolatilizing the ionic impurites from a polycarbonate composition employing an aqueous medium of about 1% by weight based on the weight of the polycarbonate composition. Preferably the devolatilizing is carried out in an extruder during compounding the polycarbonate composition and preferably under a vacuum. Also, the extruded strands of polycarbonate resin are quenched in a water bath having a Sulfate and Chloride ion content of less then 300 ppb each. <IMAGE></p> |
申请公布号 |
EP0924260(A2) |
申请公布日期 |
1999.06.23 |
申请号 |
EP19980309965 |
申请日期 |
1998.12.04 |
申请人 |
GENERAL ELECTRIC COMPANY |
发明人 |
SPILMAN, GARY EUGENE;SKABARDONIS, JOHN G.;GOHR, ERIC THOMAS;LINDWAY, MARTIN J.;HAMILTON, DOUGLAS GEORGE;BRADLEY, DAVID A. |
分类号 |
C08K5/3475;C08G64/40;C08K5/3492;C08L69/00;G11B5/84;G11B23/00;(IPC1-7):C08L69/00 |
主分类号 |
C08K5/3475 |
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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