发明名称 |
METHOD FOR THE CONTINUOUS PRODUCTION OF POLYAMIDE GRANULES |
摘要 |
The invention relates to a continuous method for production of polyamide granules, comprising a hydrolytic polymerisation of a mixture of at least one lactam and water to give a low-viscosity polyamide melt at a pressure of at least 5 bar and granulation of the low-viscosity polyamide melt by direct droplet formation with maintenance of a pressure which corresponds to at least the vapour pressure of the water retained in the polyamide melt. The low-viscosity granules thus obtained can be condensed in a single-stage subsequent step by treatment with super-heated steam to give a higher viscosity and unreacted monomers and cyclic oligomers extracted and then dried. The invention is characterised by gentle conditions with reduced residence time and temperatures. |
申请公布号 |
WO2007128521(A3) |
申请公布日期 |
2008.03.13 |
申请号 |
WO2007EP03960 |
申请日期 |
2007.05.04 |
申请人 |
UHDE INVENTA-FISCHER AG;SCHMIDT, GERHARD |
发明人 |
SCHMIDT, GERHARD |
分类号 |
C08G69/16;B01J2/18;B29B9/10;C08G69/14 |
主分类号 |
C08G69/16 |
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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