Compositions: coating or plastic – Materials or ingredients
Patent
1975-01-29
1978-09-05
Douglas, Winston A.
Compositions: coating or plastic
Materials or ingredients
106 40V, 65 21, 428402, 428404, C03B 1910
Patent
active
041117131
ABSTRACT:
Novel hollow spheres are made by tumbling solidifiable liquid globules of binder material in a mass of minute solid discrete free-flowing particles. The particles serve as a parting agent during the tumbling action, keeping the globules separate from one another, and become at least partially absorbed into the globules. As the tumbling proceeds, the globules are first converted to a hollow, generally spherical condition by the action of a volatile void-forming agent in the binder material, and then solidify. The new hollow spheres made by this process have a solidified seamless exterior wall that carries at least on its exterior surface partially embedded, partially protruding parting agent particles, and usually is filled throughout at least a major portion of its thickness by parting agent particles.
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patent: 3978269 (1976-08-01), Martin
Alexander Cruzan
Douglas Winston A.
Howard J. V.
Minnesota Mining and Manufacturing Company
Sell Donald M.
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