Purification of video disc lubricant additives

Details Purification of video disc lubricant additives Purification of video disc lubricant additives

1982-11-10

1984-10-30

Bascomb, Wilbur

Distillation: processes, separatory

Plural distillations performed on same material

One a distillation under positive pressure or vacuum

203 91, 203DIG11, 428 64, 428447, 556450, B01D 310, B32B 302

Patent

active

044798512

ABSTRACT:
An improved process for the batch distillation or purification by stripping of a bis(hydroxyalkyl)disiloxane, which purified product is useful as a video disc lubricant additive or dopant. In accordance with the process, the feedstock of bis(hydroxyalkyl)disiloxane is subjected to a vacuum evaporation of the light volatiles by gradually reducing the pressure to about 2.times.10.sup.-1 Torr. After the low boiling materials have been distilled off, the temperature is gradually increased and the pressure gradually reduced (final temperature of about 135.degree. C. and final pressure of about 4.times.10.sup.-2 Torr) so as to produce a distill and having a viscosity of about 210.+-.30 centipoise at 25.degree. C.

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