Preparation of capsules
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United States of America Patent
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Apr 14, 2015
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app pub date -
Aug 10, 2009
filing date -
Jan 20, 2004
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Abstract
Prior art processes for producing protein-based capsules (for example, capsules for use in electrophoretic media) tend to be wasteful because they produce many capsules outside the desired size range, which is typically about 20 to 50 μm. Capsule size distribution and yields can be improved by either (a) emulsifying a water-immiscible phase in a preformed coacervate of the protein; or (b) using a limited coalescence process with colloidal alumina as the surface-active particulate material.
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