Chromatographic column packing having a bonded...

Details Chromatographic column packing having a bonded... Chromatographic column packing having a bonded...

B - Operations, Transporting

01

J

252/31

B01J 20/26 (2006.01) B01D 15/08 (2006.01)

Patent

CA 1134339

Abstract Improved packings for columns useful in gas chromatography are made by a multistep process whereby polysiloxane molecules having various organic substituents are chemically bonded to the surface of a siliceous sup- port. The process comprises one or more cycles of succes- sive reactions with an activated support surface of silicon tetrachloride, an organic dichlorosilane, silicon tetra- chloride a second time, a polysiloxane polyol, with inter- mediate hydrolyses where appropriate to provide reactive terminal silanol groups and a final capping reaction with an organic monochlorosilane. The packing as so prepared is further improved by coating with a conventional sta- tionary phase. 28,201-F

362770

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