Process for reducing the back migration in mechanical vacuum pum

Details Process for reducing the back migration in mechanical vacuum pum Process for reducing the back migration in mechanical vacuum pum

1996-02-09

1996-11-05

Willis, Jr., Prince

Solid anti-friction devices, materials therefor, lubricant or se

Lubricants or separants for moving solid surfaces and...

Organic oxygen compound

508588, 508589, 252 67, 252 69, C10M14704

Patent

active

055717802

ABSTRACT:
The invention relates to a process for reducing the back migration of the most volatile fractions of perfluoropolyethers during the operation of mechanical vaccum-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.

REFERENCES:
patent: 4178465 (1979-12-01), Caporiccio et al.
patent: 4451646 (1984-05-01), Sianesi et al.
patent: 5154845 (1992-10-01), Williams
patent: 5221494 (1993-06-01), Ikeda et al.

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