发明名称 |
PROCESS FOR CRYSTALLIZING AND SOLID STATE POLYMERIZING POLYMERS AND THE COATED POLYMER |
摘要 |
<p>This invention relates to a process for crystallizing and solid state polymerizing polymers, in the form of amorphous pellets by coating the pellets with a coating of 50 to 250 ppm of an anti-sticking agent to the amorphous pellets. The invention also relates to such a coated pellet. The coated pellet is then heated such that its surface is at least partially crystallized or essentially crystallized. Next it is solid state polymerize to a high molecular weight. The capacity of the crystallization and solid state polymerization process can be increased by using higher temperatures when the anti-sticking agent is present as compared to a normal process using the same polymer. The preferred anti-sticking agents are chosen to give high clarity to articles made from the high molecular weight pellet. The preferred anti-slicking agent is fumed silica, but other organic and inorganic coatings may be used.</p> |
申请公布号 |
EP1843861(A1) |
申请公布日期 |
2007.10.17 |
申请号 |
EP20040811969 |
申请日期 |
2004.11.22 |
申请人 |
INVISTA NORTH AMERICA S.A.R.L. |
发明人 |
YU, WEI-CHING |
分类号 |
B05D7/00;B32B15/02;C08G63/00;C08G64/00 |
主分类号 |
B05D7/00 |
代理机构 |
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主权项 |
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地址 |
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