Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1978-12-29
1981-01-27
Michl, Paul R.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
526 88, 526201, C08F 222
Patent
active
042474345
ABSTRACT:
Monodisperse latexes having a particle size in the range of 2 to 40 microns are prepared by seeded emulsion polymerization in microgravity. A reaction mixture containing smaller monodisperse latex seed particles, predetermined amounts of monomer, emulsifier, initiator, inhibitor and water is placed in a microgravity environment, and polymerization is initiated by heating. The reaction is allowed to continue until the seed particles grow to a predetermined size, and the resulting enlarged particles are then recovered. A plurality of particle-growing steps can be used to reach larger sizes within the stated range, with enlarged particles from the previous steps being used as seed particles for the succeeding steps. Microgravity enables preparation of particles in the stated size range by avoiding gravity-related problems of creaming and settling, and flocculation induced by mechanical shear that have precluded their preparation in a normal gravity environment.
REFERENCES:
patent: 3424706 (1969-01-01), Smith
patent: 4011388 (1977-03-01), Murphy
patent: 4079101 (1978-03-01), Duke
patent: 4094841 (1978-06-01), Mani
El-Aasser Mohamed S.
Kornfeld Dale M.
Lovelace Alan M. Administrator of the National Aeronautics and Space
Micale Fortunato J.
Vanderhoff John W.
Beumer Joseph H.
Manning John R.
Michl Paul R.
Wofford, Jr. L. D.
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