发明名称 |
Process for Producing Ultrafine Powders Based on Polyamides, Ultrafine Polyamide Powders and Their Use |
摘要 |
Process for preparing ultrafine powders based on polyamides by contacting polyamides having a relative solution viscosity eta<SUB>rel </SUB>in the range from 1.5 to 2.0, measured in 0.5% m-cresol solution at 25° C., with an alcoholic medium in the presence of inorganic particles under the action of pressure and/or temperature to generate an at least partial solution, and then precipitating the polyamide from the at least partial solution, characterized in that a suspension of the inorganic particles suspended in the alcoholic medium is used. The resulting ultrafine polyamide powders have a specific BET surface area in the range of 5-100 m<SUP>2</SUP>/g; a fineness d<SUB>50 </SUB>of less than 70 mum; an apparent density AD in the range from 250 to 1000 g/l; and a particle content of 0.1 to 80% by weight of inorganic particles based on the total weight of the polyamide powder. They are equally suitable for coatings and for mouldings and components with improved mechanical properties.
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申请公布号 |
US2008249237(A1) |
申请公布日期 |
2008.10.09 |
申请号 |
US20060089998 |
申请日期 |
2006.10.12 |
申请人 |
EVONIK DEGUSSA GMBH |
发明人 |
HAGER HARALD;BAUMANN FRANZ-ERICH;LORTZ WOLFGANG;BATZ-SOHN CHRISTOPH |
分类号 |
C08L77/06;B29C45/00;B29C47/00;B29C49/00;C08G69/26 |
主分类号 |
C08L77/06 |
代理机构 |
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