Method for the molecular weight fractionation of polyhydrogen si

Details Method for the molecular weight fractionation of polyhydrogen si Method for the molecular weight fractionation of polyhydrogen si

1993-10-29

1995-05-16

Bleutge, John C.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

528494, 528497, 528498, C08F 612

Patent

active

054161908

ABSTRACT:
Disclosed is a highly reproducible method for the molecular weight fractionation of polyhydrogen silsesquioxane that gives a very storage-stable polyhydrogen silsesquioxane having a freely selectable molecular weight. The method involves dissolving polyhydrogen silsesquioxane in active-hydrogen-free nonpolar solvent; adding an active-hydrogen-free polar solvent to the resulting solution in order to precipitate polyhydrogen silsesquioxane; and collecting the desired molecular weight fraction of polyhydrogen silsesquioxane.

REFERENCES:
patent: 3615272 (1971-10-01), Collins et al.
patent: 5063267 (1991-11-01), Hannaman et al.
patent: 5279661 (1994-01-01), Gentle
patent: 5310583 (1994-05-01), Eckstein et al.

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