High purity polyhydrogen silsesquioxane resin for electronic coa

Details High purity polyhydrogen silsesquioxane resin for electronic coa High purity polyhydrogen silsesquioxane resin for electronic coa

1995-02-13

1996-01-23

Sweet, Mark D.

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

528 31, 528 42, C08L 8300

Patent

active

054865646

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: 4808653 (1989-02-01), Haluska et al.
patent: 5063267 (1991-11-01), Hanneman et al.

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