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AssigneeSchering Corporation
InventorsWolfgang Schmidt, Andreas Briel, Georg Roessling, Peter Hauff, Michael Reinhardt, Frank-Detlef Scholle
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The subject of the invention is a multi-stage process for the production of narrowly-distributed gas-filled microcapsules. In one process step, polymerization of the shell-shaping substance(s) takes place, and in a process step that is separated from it in space and/or time, the formation of the microcapsules by a build-up process takes place. The build-up process is carried out by low-energy defined gas input of the gas that is to be encapsulated with the aid of a porous membrane that has small defined pore openings.
Multi-stage process for the production of gas-filled microcapsules, in which in one process step, polymerization of the shell-shaping substance(s) takes place, and in a process step that is separated from it in space and/or time, the formation of the microcapsules by a build-up process takes place in each case while being stirred, characterized in that the build-up of microcapsules is carried out under defined external gassing.
21 Process according to one of claims 1 to 20, wherein to take up the floated material, water or 0.9% common salt solution is used as a physiologically compatible medium.
Dependencies are inferred from the claim text.