发明公开
- 专利标题： Process for reducing the back migration in mechanical vacuum pumps operating with perfluoro-polyether oils
- 专利标题（中）： 机械真空泵在全氟聚醚油运行中减少后移动的方法
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申请号： EP93101140.7申请日： 1993-01-26
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公开(公告)号： EP0553768A3公开(公告)日： 1993-08-25
- 发明人: Silvani, Rossella , Carsetti, Valerio , Pace, Casimiro , Srinivasan, Padmanabhan
- 申请人： AUSIMONT S.p.A.
- 申请人地址： Foro Buonaparte, 31 I-20121 Milano IT
- 专利权人： AUSIMONT S.p.A.
- 当前专利权人： AUSIMONT S.p.A.
- 当前专利权人地址： Foro Buonaparte, 31 I-20121 Milano IT
- 代理机构： Simeoni, Lucio, Dr.
- 优先权： ITMI920170 19920130
- 主分类号： C10M107/38
- IPC分类号： C10M107/38 ; F04C29/02 ; C08G65/30
摘要：
The invention relates to a process for reducing the back migration of the most volatile fractions of perfluoropolyethers during the operation of mechanical vacuum-generating pumps which utilize perfluoropolyethers: use is made of perfluoropolyethers containing not more than 0.1% by weight of fractions having a molecular weight lower than or equal to 1,500 and not more than 1.3% by weight of fractions having a molecular weight lower than or equal to 1,800.
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