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|1. (WO2017040900) METHOD OF MAKING HOLLOW GLASS MICROSPHERES|
|Applicants:||3M INNOVATIVE PROPERTIES COMPANY
WOLFF, Friedrich M.
ZIPPLIES, Tilman C.
CHANDLER, Blake E.
|Title:||METHOD OF MAKING HOLLOW GLASS MICROSPHERES|
Provided are methods of manufacturing hollow glass microspheres where a feed composition comprising a glass powder and a blowing agent entrained in the glass powder is introduced into an opening at a first end of a vertically-aligned furnace. Agglomerated glass, unmelted oxides, or natural glassy materials can be used in place of, or in addition to, the glass powder in the feed composition.